JPH01280264A - Display device for ground-fault accident point survey - Google Patents

Abstract

PURPOSE:To facilitate the assembly of a coil member by inserting a detection coil member consisting of two coils mounted concentrically with two through holes formed in a coil case into two leg parts of a U-shaped element. CONSTITUTION:An element 41 is fixed to a substrate 5 by an adhesive material and a presser 34. The coil member 42 has coils 58 and 58' stored in a storage part 45, and terminals of the coils and respective terminals 48a of cores of a lead member 46 are connected respectively. Then the member 42 is mounted on an element 31 by inserting leg parts 31a and 31b into the insertion holes 44 and 44. Then the other end 48b of the member 46 is inserted into a lead-in hole 53, an insertion part 52 is inserted into a hole 53, and a lock member 50 is fixed on the flank of an electric conductor reception part while an engagement collar 51 is positioned in a recessed part 54. The terminals 48 are connected to a driving circuit. Then a cover member 61 is provided by inserting the leg parts 31a and 31b into the core insertion holes 63. Thus, the projection of the member 42 to below the element 31 is eliminated to reduce the height size of the display device correspondingly.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is a method for detecting and displaying ground fault faults when an exploration signal current flows through the distribution line by being attached to the distribution line. Regarding a display device for point exploration.

[Conventional technology]

An annular core of a current transformer is attached to the distribution line so that the distribution line passes through it, and a detection coil is attached to the core, and when an exploration signal current flows through the distribution line, a detection signal is sent to the coil. There is a device in which the detection signal is used to operate a display section.

However, since it is difficult to attach the annular core to the distribution line with the above structure, the present applicant filed Japanese Patent Application No. 62-206743 dated August 20, 1988 and August 2, 1988.
In Japanese Patent Application No. 62-207476 dated 1987, there is a device which has a detection section that detects the exploration signal current flowing through the distribution line, and a display section that activates the display upon receiving the signal from the detection section. The detection unit has a base body and a presser body that are positioned below and above the distribution line, respectively, and the base body includes a U-shaped body in the annular current transformer core. a first element having a shape, and the first element having a shape of
A coil member is attached to the connecting portion between the two legs of the element, while a second element having an inverted U shape in the annular current transformer core is attached to the presser body. A display device for point exploration is proposed.

[Problem to be solved by the invention]

However, in the above-mentioned proposal, when assembling the coil member to the first element, the conductor for the coil is connected to the connection part of the first element, and there are legs that stand up at both ends of the wire, which obstruct the work. There is a problem with the difficult work of winding under such conditions.

Since the coil is wound around the connecting part as mentioned above, there is a problem that the coil protrudes below the first element, which increases the height of the entire display. . In this respect, there is a problem in that when the display device is attached to a power distribution line, the display shakes greatly due to strong wind exposure, which adversely affects the power distribution line.

The present invention has been made in view of the above points, and an object of the present invention is to make it possible to extremely easily assemble the coil member to the first element, and furthermore, to attach the coil member to the lower part of the first element. To provide a display device for detecting a ground fault fault point, in which the overhang of a member can be reduced to zero, and the height dimension of the display device can be reduced accordingly.

[Means to solve problems]

In order to achieve the above object, the present invention takes the measures as described in the claims above, and its effects are as follows.

[Effect]

The detection coil member can be assembled to the first element by simply placing the detection coil member over the leg of the first element so that it passes through the insertion hole of the coil case. In the state where the detection coil member is assembled to the first element, the detection coil member does not have any projecting dimension below the first element.

〔Example〕

The drawings showing the embodiments of the present application will be described below.

In the display device 1 shown in FIGS. 1 and 2, 2 is a detection section, and 3 is a display section, which are formed integrally with the detection section 2.

In the detection unit 2, the 4
indicates a base body, which is formed by molding an aluminum alloy. In the base body 4, 5 is a substrate, and 6 is a substrate 5.
A T-line receiving part, 7a, formed by bulging a part of the
Reference numeral 7b indicates a connecting piece, and reference numeral 8 indicates a recess for attaching a core.

Next, 10 shown in detail in FIGS. 1 and 3.4 is a detection unit 2.
The presser foot shown in FIG. In the presser body 10, a main body 11 is formed by press-forming a metal plate into a U-shaped cross section as shown in FIG. In the main body 11, 12 is a bolt insertion hole formed at one end thereof;
Reference numeral 13 indicates an inlet, and reference numeral 14 indicates a stopper.

Next, 15 is a mounting seat provided in the middle part of the main body 11,
As shown in Fig. 16.17, it is formed to project from the left and right. 16 is a support attached to the seat 15;
It is made of polyethylene. Reference numeral 17 denotes an electric wire holder, which is exemplified as a positioning member attached to the support body 16, and is used to position the distribution line with respect to a second element in the core, which will be described later, and is made of an elastic rubber material. , the bottom surface is recessed with a part 18 for receiving the electric wire.

Next, two fasteners provided on both sides of the distribution line installation space 20 for fastening the presser body 10 to the base body 4 will be explained. Reference numeral 21 indicates one of the fasteners, which is composed of a hinge. As this hinge tool 21, a shaft pin is used as shown in FIGS.
O is hinged to the base 4 so as to be openable and closable. Next 22
1 indicates the other fastener, which is composed of an engaging rod whose negative end is connected to the base body 4 and whose other end is engaged with the presser body 10. In this fastener 22, 23 is a bolt, one end of which is pivoted to the connecting piece 7b with a shaft 24, as shown in FIG. 1.2.3. Reference numeral 25 denotes a seat formed in the middle part of the bolt 23, which is shaped like a flange as shown in the figure. Reference numeral 26 indicates a tightening nut screwed onto the port 23.

Next, the structure of the current detecting current transformer 28 shown in FIG. 1 in the detecting section 2 and its mounting on the base body 4 and presser body 10 will be explained. Reference numeral 30 denotes a current transformer core, which is formed into an annular shape surrounding the distribution line installation space 20. The core 30 is made of ferrite. In the above core, 31 is a U-shaped first element;
2 indicates an inverted U-shaped second element. In the first element 31, 312.31b shown in FIG.
Reference numeral 1C designates a connecting portion that connects both legs, and when it is placed in the mounting recess 8, it is fixed there with an adhesive 33 as shown in FIG. 1, and as shown in FIG. 5.12. It is fixed to the substrate 5 using the presser 34 and the upper screw 35 as shown in FIG. 31a' and 31b' each indicate a connecting end surface.

Next, the second element 32 will be explained. In particular, in FIG. 1.4, 32a and 32b are leg portions, 32c is a connecting portion, and the back or upper surface 32C is formed into a flat surface as shown in FIG. 17. 32a' and 32b' each indicate a connecting end surface.

Next, the attachment structure of the second element 32 to the presser body 10 will be explained with reference to FIG. 1.4.17. 36 is the support plate 16
The upper surface of the receiving member is formed into a V-shaped four portion 36a, into which the lower surface 32c'' of the connecting portion 32C of the second element 32 is fitted. The horizontal dimension in FIG. 1 is approximately equal to or slightly shorter than the dimension between the leg portions 32a and 32b of the second element 32, so that the positioning of the second element 32 in the horizontal direction in FIG. Let it be done.

Next, a leaf spring 37 is attached to the main body 11 of the presser body 10 with a stopper (rivet) 38. The distal end portion 37a of the cough plate spring 37 is in contact with the main body 11, and the intermediate portion 37a is in contact with the main body 11.
b resiliently contacts the upper surface 32C' of the second element 32 and urges the second element 32 toward the base body 4 side.

With this configuration, the second element 32 can elastically move forward and backward toward the base body 4 side. Note that 39 is a stow/bar attached to the main body 11 to prevent excessive deformation of the spring 37. Note that 40 is an end surface 32a' at the tip of the legs 32a, 32b of the second element 32.
, 32b. The guide member is made of synthetic resin material and has a tapered guide surface 40a as shown in FIG. 1 on its inner surface.

32b with adhesive 40b. This guide member 40 may be provided at the leg portion of the first element 31.

Next, 42 shown in FIG. 1.5 indicates a coil member for signal detection in the current transformer 2. This coil member will be further explained with reference to FIGS. 6 to 10. 43 is a coil case made of synthetic resin material. In this case, reference numeral 44 indicates an insertion hole through which the legs are inserted, and reference numeral 45 indicates a coil storage portion. Reference numeral 46 denotes a lead member, one end of which is integrally connected to the case 43 at a connecting portion 47. In the lead member 46, 48 is a core wire, which is a plurality of twisted wires, one end of which is connected to the coil case 4.
It is exposed within 3. Reference numeral 49 denotes a covering body, which covers the case 43.
It is formed from and parts. Reference numeral 50 denotes a weighted member provided at the intermediate portion of the lead member, which is formed on the covering body 49 and the member. In the weighting member 50, reference numeral 51 indicates a locking collar for fixation, and reference numeral 52 indicates an insertion portion, which is formed into a tapered shape as shown in the figure. Furthermore, the core wire 4 at the location of the weighted member 50
8C is untwisted so that it is difficult for water to pass through it.

Next, the retracting portion of the lead member formed on the base body 4 will be explained. Reference numeral 53 indicates a lead-in hole formed in the side wall of the receiving portion 6, which is formed into a tapered shape as shown in the figure. Reference numeral 53a indicates a locking portion provided on the edge of the lead-in hole 53, and the locking flange 51
This is to prevent the lead member 46 from moving in and out of the lead-in hole 53. In this case, reference numeral 54 denotes a recess for retaining a locking flange formed on the periphery of the lead-in hole 53;
A holding piece 5 is made of a metal material and is fixed to the side wall of the wire receiving portion 6 with a tightening screw 56. Further, in the fixed state, the locking collar 51 is pressed against the bottom surface of the recess 54 to prevent water from entering into the lead-in hole 53.

Reference numeral 57 denotes an adhesive poured into the gap between the recess 54 and the locking collar 51, which is used auxiliary to maintain waterproofness in the same manner as above. Next, 58.58° indicates a coil provided in the housing portion 45 in the coil case 43.

Next, 61 shown in Fig. 1.3.4.5 is the coil 4.
2, showing a cover member placed thereon to cover 2;
It is made of a rubber material with good anti-tracking properties. In the cover member 61, reference numeral 62 denotes a flat plate portion, which is configured in a plate shape and is mounted on the wire receiving portion 6 of the base body 4. In the flat plate part 62, 63, 63 is a core insertion hole, and 64 is a distribution line mounting part, which is located above the upper surface of the receiving part 6. Reference numeral 65 denotes a positioning piece, which is an example of a positioning member, and is used to position the distribution line with respect to the first element.Next, 67 is a cylindrical part integrally formed with the flat plate part 62, and is attached to the periphery of the flat plate part 62. The lower end portion 67a thereof extends to the outside of the display case, which will be described below.

Next, the display section 3 will be explained. Reference numeral 71 shown in FIGS. 1 to 3.5 is a case, which is composed of a bottom wall 72 that includes the substrate 5 of the base body 4, and a cylindrical side wall 73 that extends downward from the periphery of the bottom wall. A mounting frame 74 is fixed to the case 71. Reference numeral 75 denotes a drive circuit attached to the mounting frame 74, which is constructed by attaching well-known circuit elements to a printed circuit board as shown in FIGS. 19 and 20. Next, 76 indicates a display body. In the display body, 7
7 is a base frame attached to the mounting frame 74; 78 is a display member, which is rotatably attached to the base frame 77;
As shown in FIGS. 13 to 15, 8 is painted separately to have a white part 78a and a black part 78b. Although not shown, a driving member for driving the display member 78 is attached to the base frame 77. Next, 80 is a shielding frame, which is formed in black, and has windows 81 and 82 formed on the side and bottom surfaces, respectively. 83 is a fitting piece provided on the shielding frame 80;
The shielding frame 80 is positioned by fitting into a fitting part 84 formed on the case 71.Next, 85 is a display cover made of a transparent material, and a fastening ring. It is fixed to the case 71 with 86. 87 indicates a watertight O-ring.

In the display section 3 as described above, when no signal is given from the detection section 2, the display member 78 is in the normal position as shown in FIG. A white portion 78a of the member 78 is hidden by the shielding frame 80 and cannot be seen (the entire member appears black). When a detection signal is applied from the - direction detection unit 2 to the display unit 3, the signal is applied to the drive member of the display body 76 via the drive circuit 75, and the display member 78 rotates. As a result, as shown in FIG. 15, the white portion 78a of the display member 78 can be recognized from the outside of the display cover 85 through the windows 81, 82 in the shielding frame 80.

Next, reference numeral 90 shown in FIGS. 2 and 18 is an auxiliary member exemplified as a positioning member for positioning the small-diameter power distribution line with respect to the first element. This means that insulated wires used for high-voltage distribution lines generally have a diameter of 5 fins (outside diameter of 9 f).
1) to about 200SQ (outer diameter 24°5 fl) are used, and it is necessary to attach indicators to all of these insulated wires. In this case, it is used when attaching a display to a thin power distribution line. In the auxiliary member 90, 91 is a mounting surface for the mounting surface 64, and 92 is a wire receiving portion, which is formed in a concave shape. Reference numeral 93 denotes a projecting portion, which is positioned between the positioning pieces 65 of the cover member 61 as shown in FIG. 18, so that the auxiliary member 90 can be positioned. Such auxiliary members 90 are prepared with various height dimensions from the mounting surface 91 to the receiving portion 92 to match electric wires of various diameters.

In the indicator I having the above configuration, the first element 31 and the coil member 42 in the current transformer core 30 are assembled as follows. First, the first element 31 is fixed to the substrate 5 using an adhesive 33 and a presser 34. On the other hand, the coil member 42
In this case, the coil 58.58° is stored in the storage part 45, and each terminal of the coil and the core M4 of the lead member are connected to each other.
8 terminals 48a, respectively.

Next, the coil member 42 is attached to the first element 31 with its legs 31a, 31b inserted into the insertion holes 44, 44. Next, the other end 48b of the lead member 46 is inserted into the lead-in hole 53, and the upper member 50 is held down with the insertion portion 52 inserted into the lead-in hole 53 and the locking collar 51 located in the recess 54. It is fixed to the side surface of the wire receiving part 6 with the piece 55. Note that the end 4 of the lead member inserted through the lead-in hole 53
8b is connected to the drive circuit 75. Next, cover part 6
1 is placed over the core with the legs of the first element 31 inserted into the insertion holes 63. As a result, the first element 31
And the assembly of the coil member 42 is completed.

Next, the attachment of the display having the above configuration to the high voltage distribution line 95 will be explained. As shown in FIG. 2, with the holding body 10 open to the base 4,
5, the base 4 is applied from the bottom side thereof. That is, the distribution line 95
is positioned in the mounting portion 64 between the positioning pieces 65 and 65 in the cover member 61.

Next, the presser body 10 is placed over the power distribution vA95.

This operation can be easily carried out by slightly pushing up the presser foot 10 in the direction of arrow 96 in FIG. When the presser body 10 is placed over the power distribution line 95 in this way, the tapered guide surface 40a of the guide member 40
Therefore, the connecting end surface 31'+3tb' of the first element 31
The connecting end surface 32a' of the second element 32 to the connecting end surface 32a'.

32b' is properly positioned, and the end faces 31a' and 3
2a'' and the end faces 31b° and 32b° fit tightly together without any displacement.Next, raise the bolt 23 as shown by the arrow 97 in FIG.
and position it in the insertion hole 12. After that, the nut 26 is tightened and the presser body 10 is sequentially moved to the base body 4 side, and the power distribution 1
95 is the part 1 in the distribution line mounting part 64 and the wire holding part 17
8 and firmly sandwiched between the two.

In this case, even if the main body 11 of the presser lO moves toward the base 4, the second element 3 whose end surface is already in contact as described above
2 does not move in the same direction, and only the leaf spring 37 is bent. Therefore, in this state, the second element 32 is pressed against the first element 31 by the urging force of the leaf spring 37. As a result of the above description, the lower surface 3 at the connecting portion of the second element 32
2c'' and the receiving member 36, a gap is created as shown in FIG.

When tightening the nut 26 as described above, movement due to the tightening is limited to a position where the tip of the main body 11 of the presser 10 comes into contact with the seat 25.

This can prevent the main body 11 of the presser lO from moving excessively toward the base 4 and crushing the leaf spring 37 (incapable of developing elasticity).

In addition, when attaching to the electric wire 95 as described above, when the holding body 10 is in an open state with respect to the base body 4 as shown in FIG. Even if the second element 32 hits a foreign object, since the second element 32 is elastically held by the leaf spring 37, the second element 3
2 can be tilted as shown in phantom in FIG. 17 to prevent large forces from being applied to the second element 32 and damaging it. After the second element 32 is tilted as described above, the leaf spring 37 presses the flat upper surface 32C° of the second element 32, so that the second element 32 returns to its original state as shown by the solid line in FIG. Return.

Next, the operation of the display device having the above configuration will be explained. In the above installation state, when the exploration signal current flows through the high voltage distribution line 95,
The resulting magnetic flux is generated in the core 30.

The magnetic flux is detected by the coil 58 in the coil member 42, and the detection signal is transmitted to the drive circuit 75 through the core wire 48 of the lead member 46 as described above. As a result, the display member rotates as described above. The above-mentioned indicator also performs the same operation as described above when a short-circuit current flows through the high-voltage distribution line 95, and when a return signal current flows through the high-voltage distribution line 95, the above-mentioned indicator 76 performs a reset operation, but these For details, please refer to the following circuit description and its operation description.

Next, the circuit configuration of the display device will be explained.

As shown in the block diagram in FIG. 19, this indicator is a current detection mechanism 256 that detects the current flowing through the distribution line and generates a DC output of a magnitude corresponding to the magnitude of the current flowing through the distribution line.
, a display energy storage capacitor C2 and an open energy storage capacitor C7 configured to store the DC output of the current detection mechanism 256, and first to third switches 259, each of which is normally open.
~261 When the electric power 2it detection mechanism 256 detects a large current at the time of a short circuit in the overhead power distribution line and a small current at the time of a ground fault, it gives a closing command to the second switch 260, and the normal load of the overhead power distribution line is detected. The determination means 262 is configured to give an opening command to the third switch 261 when a medium current is detected, and the charging voltage of the display storage capacitor C2 is determined to be the operating voltage of the coil 254 in the drive member of the display body 76. A switch control means 263 configured to give a closing command to the first switch 259 when the above conditions occur.
and the signal current detection circuit 26 of the switch control means 263.
3a. The first and second switches 259
．． One end of the series circuit 260 is connected to the display energy storage capacitor C2, and the other end is connected to the coil 254 so that it can be energized in the display direction. One end of the switch 261 of No. 3 is connected to the current detection mechanism 256 via the opening storage capacitor C7, and the other end is connected to the coil 254.
The connection is made so that electricity can be applied in the above-mentioned return electricity supply direction.

The current detection mechanism 256 includes the current transformer 28, half-wave and full-wave rectifier circuits 264 and 265 connected to each coil 58 and 58' of the current transformer, and a resonant circuit 266 attached to one of the coils 58. Consists of. One coil 58 in the current transformer 28 has, for example, 6,000 turns, and a capacitor C1 is connected in parallel to it, so that the resonant circuit 26
6 is formed. This resonant circuit 266 is for efficiently detecting and outputting a 180-cycle exploration signal arriving from a transmitter via a power distribution line, and for reducing the output of a commercial frequency signal. The other coil 58' has, for example, 1500 turns. The discriminator tJI262 has a probe signal current detection circuit 267 and a normal load current detection circuit 2.
68 , short circuit current detection circuit 269 , and suppression circuit 27
Consists of 0. The configuration of each circuit and each switch described above is as follows.
As shown in the figure, its details will be explained next along with its operation.

The operation of the display when a probe signal current flows through the power distribution line 95 will be explained based on FIG. 20 showing its circuit configuration.

In addition, the current flowing through the distribution line 95 and Fig. 20 (A) to (E)
The waveform at each point is as shown in FIG. When the probe signal current flows through the distribution line 95, the current is detected by the coil 58 in the current transformer 28. In this case, the output signal obtained from the coil 58 is sufficiently large due to the resonance caused by the capacitor C1. The output signal is rectified by the diode DI and stored in the display storage capacitor C2.

Further, the above output signal is manually inputted to the exploration signal current detection circuit 267. In the circuit 267, the signal is connected to the capacitor C
5 and a resistor R1, and is applied to the voltage detection element 271 via a diode D4. The voltage detection element 271 has an input terminal 271a indicated with a subscript a.
When there is an input signal of detection level v1 or higher, the signal is sent as an output signal from the output terminal 271b shown with a subscript ``su'', and when there is no human input signal, an output signal is generated at the output terminal. This is an element with unique characteristics. An example of such an element is a commercially available C-MOS 8502A.
There is LB.

The same applies to other voltage detection elements described below.

The output signal of the voltage detection element 271 is input to the pulse transformer T1, and further sent from the transformer T1 to the gate of the 5CR292, thereby making the 5CR292 conductive.

When the display energy storage capacitor C2 is sufficiently charged and reaches the operating voltage of the magsign coil 254 of the display body 76, that is, when it becomes higher than the detection level v2 of the voltage detection element 272, the voltage detection element 272 detects it. , sends out a signal from its output terminal 272b to make 5CR291 conductive. When 5CR291 becomes conductive, 5CR292 is already in a conductive state, so the display capacitor c2-scR29
The electric charge charged in the capacitor C2 is discharged through the path of 1→5CR292→Magsine coil 254-capacitor C2. Due to this discharge, an exciting current flows through the coil 254 in the direction of arrow X. As a result, the display member 78 moves from the normal position (FIG. 14) to the failure display position (FIG. 15) as described above, and the display enters the display state.

In FIG. 20, the signal current detection circuit 263a includes a Zener diode (8ν) D for protecting the voltage detection element 272.
3, a Zener diode (6.2V) D2 for matching the detection level v2 of the voltage detection element 272 to the operating voltage of the magsine coil 254, and a capacitor C4.

Next, when a return signal flows through the power distribution line 95, the display state of the display is restored as follows.

When a return signal current of a predetermined value, for example 48 or more, flows through the distribution line 95, the current is detected by the coil 58' of the current transformer 28. The detected signal is rectified by the bridge-connected diode D7 of the full-wave rectifier circuit 265 connected to its output terminal, and charged into the recovery storage capacitor C7 via the resistor R3. The resistor R3 is a resistor for ensuring the operating voltage of the relay Ry, which will be described later. As mentioned above, the reset capacitor C7 is charged by the signal from the current transformer 28, and the potential at the point (E) rises, and when it exceeds the detection level v3 of the voltage detection element 273, the output terminal of the element 273 2
A signal is sent from 73b to the pulse transformer T2, and further a gate signal is sent from the transformer T2 to the gate of 5CR293, making 5CR293 conductive. When 5CR293 becomes conductive, the reset capacitor C7 - Sogesine coil 2
54→Relay contact Ryb→5CR293→A closed circuit of the return capacitor C7 is formed, and the charge of the capacitor C7 is discharged. Due to this discharge, the coil 2 of the display body 76
54, a current flows in the direction opposite to that when the ground fault is displayed, as indicated by arrow Y. As a result, in the display body 76, the display member 78
is rotated in the opposite direction and returns to its normal position. The restoration work described above is carried out by supplying a normal commercial frequency load of 1 Jt (4 t) to the distribution line 95.
The same method as above can also be carried out by flowing A or higher).

Note that D9 is a Zener diode (8V) for limiting the voltage at the input terminal 273a of the voltage detection element 273 to a constant value;
D8 is a Zener diode (13V) to keep the voltage at point (E) constant, and C8 is a Zener diode D9.
This is a capacitor connected in parallel to the

In the case of the above-mentioned return operation and subsequent load current energization, the signal of the suppression circuit 270 is transmitted to the ground fault detection signal detection circuit 26.
7 and voltage sensing element 2 of the same circuit 267.
71 from performing a detection operation. That is, when a load current is flowing through the line, if the potential at point a is set to the reference O potential, then point C becomes -. Therefore, one terminal D7' of diode D7 - point a - diode D5 - point (b) - Zener diode D6 - resistor R2 -
Current flows in the circuit between point C and the other terminal D7'' of diode D7.

Therefore, even if the coil 58 detects the load current and becomes positive, the potential at point (B) becomes O, and the voltage detection element 271 becomes inoperable. Therefore, even if the display capacitor C2 is charged and 5CR291 is in a conductive state, the voltage detection element 271 is forcibly suppressed from its detection operation by the signal from the suppressing circuit 270 as described above, and 5CR292 is in a non-conductive state. is maintained, no current flows through the magsine coil 254, and the display mechanism does not enter the display state.

Also, after recovery, the load current is weak (e.g. about IA)
In this case, since the output of the coil 58゛ is small, the above-mentioned suppressing operation is not performed, and the second
In the load current column of FIG. 1, signals as shown by broken lines appear. However, since the level is small, the voltage detection element 271 does not detect it, and therefore no erroneous display occurs.

Next, the operation of the display when a large current (for example, a current of 8004 or more) flows through the power distribution line 95 is as follows. When a short circuit current of 80OA or more flows through the line, it is caused by current transformer 2.
8 and the output from its coil 58° is connected to diode 07.8. It is applied to relay Ry through DIO, which causes it to operate, causing contact Rya to close and at the same time contact Ryb to close.
opens. Further, the output from the coil 58 of the current transformer 28 is charged to the display capacitor C2 via the diode DI. When the display capacitor 02 is charged to a predetermined voltage, the voltage is detected by the voltage detection element 272,
The detection signal makes 5CR291 conductive. 5CR
When 291 becomes conductive, the display capacitor C2 → 5CR2
91-Relay contact Rya→Magsine coil 254-A closed circuit of display capacitor C2 is formed, and the same capacitor c
2 is discharged, and a current flows through the coil 254 of the display body 76 in the same direction as in the case of the ground fault. As a result, the display member 78 moves from the normal position toward the fault display position,
It will be in display state. The Zener diode 010 used has a voltage value that becomes conductive when the output voltage of the diode 07 reaches an output voltage corresponding to the short circuit current of 800 A. Further, the diode Dll is a diode for circulating back electromotive force.

In the above case, the differentiator circuit 257 in the ground fault detection signal detection circuit 267 outputs a point (A) when the signal flowing on the line (electric m> is a commercial frequency of 50 or 60 cycles and is an excessive current such as a short circuit current). In other words, if the above signal is a commercial frequency, even if the flowing signal is excessive, it will be different from the resonant frequency set in the resonant circuit, so there will be a sufficient detection signal (output).
is not obtained, and since the potential rise at point (A) is limited by the above-mentioned differentiating circuit, the detection level v1 of the first voltage sensing element 271 is not reached, and the element does not operate.

Next, once the restoration work for the short-circuit failure point discovered as described above is completed, normal load current is again allowed to flow through the distribution line.

In this case as well, the display state on the display device is restored in the same manner as in the above description.

Next, a transmitter used to send the above exploration signal and return signal to the power distribution line will be explained. In Figure 22, 1
01 indicates a transmitter for detecting a ground fault point. In this, 102 is an output terminal, and the distribution line 95 is connected to the contact Vt line 102b.
connected via. 103 is a ground terminal, which is grounded to the earth. 104 is an exploration signal forming circuit. The circuit 10
4, 105 is a pulsating current forming circuit, which converts low voltage DC into high voltage (for example, 10XV) pulsating current and outputs it.
-An AC converter is used. 105a indicates its input end, and 105b indicates its output end. 106 is a DC power supply,
For example, a storage battery is used. Reference numeral 107 denotes a backflow prevention means, for example, to pass current from the pulsating flow forming circuit 105 to the output terminal 102.
It is constructed with a diode that allows passage only in the direction towards the target and blocks passage in the opposite direction. Reference numeral 108 denotes a display means, for example, one whose display changes in response to the voltage at the output terminal 102.

The operation of transmitting a search signal in the above earth fault point search transmitter will be explained. Direct current flows from the electric current to the pulsating current forming circuit 10
5, the circuit 105 generates a pulsating current that swings only in one polarity (for example, positive or negative) with a frequency of, for example, 180 or 170 Hz, which is suitable for operating the indicator described below, with zero V as the reference. Output. The pulsating flow is sent to the output terminal 102 as a probe signal through the backflow prevention means 107.

Next, a description will be given with reference to FIG. 23, which shows the voltage state of the power distribution line when the probe signal is sent from the output terminal 102 of the transmitter to the arrangement 1m95. First, the output waveform of the transmitter as described above is as fal.

In the above case, if there is no ground fault in the distribution line, the following is true. The voltage of the power distribution '4IA95 is instantaneously charged to the ground capacitance of the power distribution line at the time (a) as shown in (bl), and the output voltage of the transmitter (for example, 10K
V). Next, at point (b), the backflow into the transmitter is blocked by the backflow blocking circuit 107, so
The voltage remains the same as above. Thereafter, as shown in the figure (the charging state is maintained as it is).

Next is KaiT! If there is a fault point of a resistance ground fault in J, line 95, it is as follows. The current of the exploration signal sent to the power distribution line 95 flows to the ground fault point. Therefore, the voltage of the power distribution line 95 becomes as shown in fc). Note that the voltage v1 varies depending on the magnitude of the ground fault resistance, and is about 3 to 3 V when the ground fault resistance is about 6Ω, and about 2KV when the ground fault resistance is about IKΩ.

Next, if the distribution line 95 has intermittent and irregular ground fault points due to cracks in the insulator or contact with trees, the following is the case. (As shown in dl, voltage is applied to the distribution line 95 in the same way as in case (a) above. In this state, if a ground fault occurs at the time shown in (c) (discharge in a crack, contact with a tree), there Current flows momentarily and voltage drops.When the insulation is restored, voltage is applied again at point (d) in the same way as in case (a) above.

Such operations are repeated irregularly as shown.

Next, in FIG. 24 showing an example of one circuit of the display means 108, 111 is a voltage dividing resistor circuit for voltage detection, and is composed of resistors 111a and 111b.As shown in the figure, one end of the circuit 111 is The other end is connected to an output terminal 102 and the other end is connected to a ground terminal 103. Reference numeral 112 denotes a voltage display device, one end of which is connected to the midpoint of the voltage dividing resistor circuit 111 and the other end connected to a ground circuit. In the display device 112, 113 is a rectifying diode, 114 is a smoothing capacitor, and 115 is a display device, which is a microammeter. 116 is an adjustment resistor.

In the display means 108, the voltage at the output terminal 102 is extracted at a low voltage value by passing through the voltage dividing resistor circuit 111. The voltage extracted from the diode 11
3, smoothed by a capacitor 114, and output to the display 1.
Join 15. Then, the needle of the display 115 swings according to the voltage.

According to the display means as described above, when the exploration signal is sent to the power distribution line 95, each state of the power distribution line is displayed as follows.

First, if there is no ground fault point, the needle on the display 115 remains swinging to the maximum value (voltage value of the exploration signal).

If there is a resistance ground fault in the distribution line, the voltage will swing to an intermediate voltage value depending on the thickness of the ground fault resistance and stabilize.

If there is an intermittent ground fault due to cracks in the insulator, etc., the needle swings greatly and returns irregularly.

Since the display state of the display 115 changes in this manner, the presence or absence of a ground fault point and the type of fault can be determined by looking at the display 115.

Next, the search for a ground fault point using the above transmitter will be explained based on FIG. 25. In FIG. 25, 99 is a substation, CB is a circuit breaker, and 100 is a distribution line (for example, 20 km in length), which includes an overhead high-voltage distribution line 95 for three phases. S51 to SS4 are section switches, for example, 4km
Provided for each. H1 to HIO are for each utility pole on the distribution line 100 (
(approximately every 50m) to indicate the presence of indicators. As is clear from FIG. 25, these indicators are attached to the distribution line at intervals.

In the above distribution line, for example, point P1 in Fig. 25
When a ground fault occurs in the substation 99, the well-known ground fault relay in the substation 99 is activated, opening the section switches SS3 and SS4, resulting in a power outage in that section. When such a situation occurs, the operator goes to the site carrying the transmitter 101 for detecting the ground fault point with the above configuration.

At the site, the output terminal 102 of the transmitter 101 is connected to the high-voltage distribution line in a power outage state, which is divided into measurable line lengths.
is connected to the three-phase circuit, and the ground terminal 103 is connected to the earth. Next, the search signal is sent out as described above, and the display on the display 115 in that case is checked to make the determination as described above. After that, it is sufficient to take measures according to the determination result.

Furthermore, when the transmitter is removed from the power distribution line after the above-mentioned exploration work is completed, there are the following safety concerns. That is, if there is no fault point, the distribution line remains charged with a high voltage as shown in FIG. 23(b). However, in the transmitter 101, since the voltage dividing resistor circuit 111 is connected between the output terminal 102 and the ground terminal 103, the high voltage is discharged through it. The discharge state can be confirmed by looking at the indication on the display 115.

Therefore, electric shock accidents caused by accidentally touching a charged power distribution line can be prevented. The time constant of the above-mentioned discharge is preferably set to be sufficiently long (several seconds to tens of seconds) compared to the period of the exploration signal so as not to interfere with determining the presence or absence of a fault point as described above.

Next, FIG. 26 showing a different example of display means will be explained. This example shows an example of a display means whose display changes in response to the current output to the output terminal 102. In FIG. 0, 117 is a current transformer for detecting current, and 118 is a current display device. In the device 118, 119 is a rectifying diode, 120 is a smoothing capacitor, 121 is a display, and 122 is an adjustment resistor. Reference numeral 123 denotes a current detection circuit, which produces an output when the input exceeds a predetermined value. 124 is a buzzer shown as another example of the display device.

In the display means, the current transformer 117 detects the current flowing through the output terminal 102 based on the current flowing through the ground terminal 103. The operation after detection is similar to that shown in FIG. 24, and the current flowing to the output terminal 102 is displayed on the display 121. Note that the buzzer 124 also sounds depending on the presence or absence of the above-mentioned current.

The display operation of the display means will be explained based on FIG. 27.

In FIG. 27, (a) is the output voltage waveform of the transmitter 101, and fbl~(dl is the waveform of the current output from the output terminal to the distribution line.

If there is no ground fault in the distribution line, a charging current flows momentarily from the output terminal of the transmitter 101 to the distribution line at the time (e) as shown in ('b), and the current becomes zero after charging.

Therefore, the pointer on the display 121 only twitches momentarily. Also, the buzzer 124 only beeps momentarily.

If there is a resistance ground fault in the distribution line, a current 11 (approximately 0.4 A in the case of 6Ω and 0.6A in the case of 1) flows according to the ground fault resistance as shown in C1. Therefore, the indicator 121 The pointer stably shows a fluctuation according to the above-mentioned ground fault resistance, and the buzzer 124 sounds continuously.

If there is an intermittent and irregular ground fault in the distribution line, current will flow irregularly as in FDL. Therefore, the indicator 1210 pointer swings irregularly. The buzzer 124 also sounds irregularly. In (dl), (f) indicates the current caused by a crack in an insulator or a tree touching a distribution line, and (
(g) shows the state when the above discharge continues.

It should be noted that parts that are considered to have the same or equivalent configuration as those in the previous figure in terms of function are given the same reference numerals as in the previous figure, and redundant explanations are omitted. (Also, the same concept will be used for the next time onwards, and the same reference numerals will be used to omit the duplicate explanation.) Next, Fig. 28, which shows another example of the circuit configuration of the transmitter for detecting the ground fault point, will be explained. . 131 is a signal output section,
Both of the two types of display means 108 and 108° are provided. Note that 159 in the means 108 is a voltage detection circuit.

132 is a switching section, 133 is a gate drive section, 1
34 is a control section, 135 is a transmitting section, 136 is a timer section,
Reference numeral 137 indicates a power supply section.

In the signal output section 131, Trl is an output transformer for the exploration signal, and 138 is a full-wave rectifier circuit, which is exemplified as a pulsating current forming circuit and a backflow prevention means.When an output voltage is induced in the secondary coil of the transformer Tri, It functions to rectify the current and form a pulsating current, and when the output voltage of the secondary coil is zero, a current flows from the output terminal 102 through the secondary coil of the transformer to the ground terminal 103. It acts as a deterrent. Tr2 is an output transformer for a return signal, and 139 is an output terminal for the return signal.

Next, in the switching section 132, reference numerals 141 and 142 indicate switching elements, which are GTOs (gate turn-off thyristors). 143.144 is the protection circuit (snubber circuit), ON-OFF of GTO141, 142
GT01 has been designed to deal with reverse withstand voltage caused by surges.
41 and 142, respectively, in parallel.

Next, in the gate drive section 133, 145.146 is the switching element GTO141, 142 011-O
This is a gate drive circuit for controlling FF.

Next, the control section 134 includes a transmitting section 135 and a timer section 136.
147 and 148 are OR circuits, and 149 to 152 are AND circuits, respectively.

Next, in the transmitter 135, 153 is a transmitting circuit for the exploration signal, and in this example, the frequency 172 (of the frequency of the exploration signal)
90Hz) is used. Reference numeral 154 is a return signal transmitting circuit, which transmits 50 Hz (same as the commercial frequency).

Next, in the timer section 136, 156 is a timer for setting the transmission time of the exploration signal, and the time is set to, for example, 30 seconds. Reference numeral 157 is a timer for setting the sending time of the return signal, and is set to, for example, 10 seconds.

Next, in the power supply section 137, E is a DC power supply, for example 2
A 4V storage battery, Sl is a power switch, and 160 is a voltage detection circuit, which outputs an output when the voltage of the power source E reaches a detection level to display the presence/absence (level) of the power source.

161 is a DC-DC converter that converts 24 V DC to ±12 V DC.

Next, S2 is a power supply auxiliary switch, S3 is a changeover switch, and three sets of switches 53-1 to 53-3 are linked to switch the circuit from the 90 Hz side a to the 50 Hz side or vice versa. It is. 34 is a start switch ν, which is a switch 54 provided for timer 156 and timer 157.
-1.34-2 interlocking pushbutton switches are used. Next, Ll and L2 are power indicator lamps, L
e is a transmission indicator lamp, and 158 is an AND circuit.

Next, the operation (operation method) of the transmitter having the above configuration will be explained.

First, the case of transmitting the exploration signal is explained in 29(A) and 29(B).
) Explain based on the figure. As in the previous embodiment, the output terminal 10
2 to the power distribution line, and ground the ground terminal 103.

Next, turn on the power switch S1. Then DC-DC
Converter 161 is connected to DC power supply E and operates. Each switch 53-1-s3-3 of changeover switch S3 is 90
Switch to Hertz side. Next, turn the power supply auxiliary switch S2 to O.
When set to N, the power indicator lamp L1 lights up to indicate that the power is turned on.

Next, when start switch S4 is turned on, switch 3
4-1 and 84-2 are turned on, the timer 156 is activated and starts counting time (seconds), and a signal is output from the output terminal of the timer 156 (see waveform diagram (2)).

The output signal of the timer 156 is sent to the oscillating circuit 15 on the 90 Hz side.
3 is input. Since the transmitting circuit 153 is connected to 1alXE, its output terminal outputs a 90 Hz transmitting signal to the AND circuits 149 and 150 (see waveform diagrams ■ and ■).

Also, for AND circuits 149 and 150, timer 15
The output signal from 6 is input, and the AND circuit 149.1
Signals are output alternately from 50 to 90 Hz at intervals of 90 Hz (see waveform diagrams ■ and ■).

The output signals from the AND circuits 149 and 150 are then input to OR circuits 147 and 148. Signals from the output terminals are input to gate drive circuits 145 and 146, respectively, and from the same circuits, signals are sent to each gate of GTOs 141 and 142.
As shown by (ch) and (ch°) in the waveform diagrams ■ and ■, respectively (
ON signal (signal that changes from OV to +12V.

, :f7)+l 2 V is actually lowered to 3■ due to the ON resistance of the GTO) are output alternately at intervals of 90 Hz. Further, the output of the OR circuits 147 and 148 lights up the transmission display lamp Le to indicate the transmission status. However, in the above case, for the gates of the GTOs 141 and 142, in the waveform diagrams ■ and ■, (su) and (
It continues to output an OFF signal (a signal that changes from OV to -12V) as shown by .

As mentioned above, the GTOs 141 and 142 are turned on alternately at intervals of 90 hertz, so the current iL is applied to the next side of the output transformer Tri at intervals of 90 cycles through the following path.
i2 flows.

Path of il + side of DC power supply E - Power switch Sl - Output transformer T
Intermediate tap tlo of ri → start terminal tll of output transformer Trl → selector switch 53-1 → GT O14
1 → Earth eo - An example of DC power supply E (see waveform diagram 11).

12 paths DC type #E + side - 1 power switch S1 - intermediate tap tlO of output transformer Trl -> winding terminal t12 of output transformer ↑r1 = selector switch 53-2 - G T O1
42 → Earth e〇 - One side of DC power supply E (see waveform diagram 12).

As mentioned above, the current il is applied to the primary side of the output transformer Tri.
.

12 flows alternately at an interval of 90 Hz, the output signal in the positive direction (((in the waveform diagram vl)
(see ()) and a negative direction output signal (see (()) in the waveform diagram vl) are alternately output.

Note that there is a pause time (see (r) in the waveform diagram ν1) between the above-mentioned positive output signal and negative output signal. Therefore, the positive side and negative side of the output signal are output at intervals of 180 hertz.

The output signal of the transformer Tri is rectified by a rectifier circuit to become a ripple waveform probe signal and output to the output terminal 102.

Next, a description will be given of the operation in response to a situation of an accident on a power distribution line when the above-mentioned exploration signal is output.

(If the al distribution line is healthy (no ground fault), the ground capacitance ICO of the distribution line is only charged, so after the current flows instantaneously, the signal current does not flow (see waveform diagram 13-0).
In other words, the line is charged to 10kV (see waveform diagram v2-1), and this charging voltage (lokv) is displayed on the display 115 of the display means 108 (voltmeter, which actually displays the current as a voltage). ) can be confirmed. In other words, if there is no accident, the charging voltage (lokv
), it is possible to determine whether a ground fault has occurred or not.

This charging voltage is discharged to the ground (earth eo) via a voltage dividing resistor circuit 111 which also serves as a discharge resistor. Therefore, the probe (operator) confirms the discharge of this voltage on the display 115 and proceeds to the next task after it is safe.

Mountain) When there is a ground fault in the distribution line (ground fault resistance is between θ and 6Ω), the output signal v1 of the output transformer Tri is the full-wave rectifier circuit 1.
38, the signal is shaped into a positive rectangular wave and output.

This output is output at intervals of 180 cycles (see waveform diagram ν2-2), and the voltage in this case (several kV) is higher than that in the case where there is no ground fault as indicated by the display 115 (voltmeter) of the display means 10B. A ground fault can be confirmed because it is displayed as a low voltage. In addition, the current flowing through the distribution line can be confirmed on the display 121 (ammeter) of the display means 110 (waveform diagram 4).
3-1), and the buzzer 124 follows (interlocks) with it.
A ground fault can be confirmed by sound. In other words, it can be determined that a ground fault has occurred.

(If the insulator of the C1 distribution line has intermittent ground faults (ground faults occur irregularly) If the insulator has cracks, etc. and the insulation resistance decreases and intermittent ground faults occur, the above This can be confirmed by the display means 108 and 108'. In this case, the voltage and current of the distribution line will be as shown in the waveform diagrams ν2-3 and 13-2, respectively.

Therefore, the voltmeter 115 or ammeter 121 is scratched and vibrates irregularly. In this case, the buzzer 124, which sounds in accordance with the output of the current detection circuit 123, also sounds irregularly. In this way, intermittent ground faults can also be detected using the voltmeter 115 and ammeter 12.
This can be determined by the irregular vibration state of 1 and the irregular intermittent sound of the buzzer 124.

When an exploration signal is sent as described above, there is a ground fault in the high-voltage distribution line to be investigated (in the case of BL or an intermittent ground fault (in the case of C1), the signal flowing to the distribution line The indicator indicates the presence of an accident by the current 13-1 or 13-2.

When the probe signal is sent as described above, the timer 156 of the transmitter is set to stop after 30 seconds, so the sending of the signal from the output terminal 102 stops after that time has elapsed. Note that when the power switch S1 is opened, the output of the transmitter is immediately stopped in an emergency.

Next, after the ground fault detection has been completed and the repair of the fault point has been completed, the transmitter sends a recovery signal to the distribution line to restore the display.

That is, in the transmitter, the output terminal 102 is disconnected from the distribution line, the ground terminal 103 is ungrounded, and instead one terminal of the output terminal 139 for recovery is connected to one of the three wires of the distribution line, and the other terminal is connected to one of the three wires of the distribution line. Connect the terminal to one of the remaining two wires. At the accident point, after connecting all three phases at once, perform the following operations.

Switch the transmitter's selector switch S3 to the 50 Hz side, and turn on the power switch S1 and auxiliary power switch S2.
Make it. Then, the power indicator lamp L1 goes out, and the 50 Hz side power indicator lamp L2 lights up to display the switching state of the transmitting circuit.

Due to the above switching, a signal is output from the timer 157 on the 50 Hz side (see the waveform diagram [phase] in FIG. 30).

The output of the timer 157 is input to the 50 Hz side oscillation circuit 154, and the output signal from the 50 Hz side oscillation circuit 154 (see waveform diagrams ■ and ■) is input to AND circuits 151 and 152, respectively. also inputs the output signal from the timer 157 (see waveform diagram [phase]).

Due to the above input, the outputs of the AND circuits 151 and 152 are input to the OR circuits 147 and 148 (see waveform diagrams O and O). This input causes the outputs from the OR circuits 147 and 148 to be input to the gate drive circuits 145 and 146. Note that the output of the OR circuit lights up the transmission indicator lamp Le to indicate the transmission status. The gate drive circuit 145. t, u; are activated, and their output signals (waveform diagram ■
°, ■゛) are added to the gates of the GTOs 141 and 142, and the GTOs 14L 142 are turned on alternately at intervals of 50 Hz. When the GTOs 141 and 142 are turned on alternately as described above, the current i4. +5 flows alternately with an interval of 50 Hz (see waveform diagram i4. +5).

14 Current path DC'l Positive side of source E - Intermediate tab L20 - Winding start terminal t21 - Changeover switch 53-1 - G T O141 - Earth e〇 - Negative side of DC current tAE i5 Current path DC type aE positive Side - Intermediate tab t20 - Winding terminal t
22→Selector switch 53-2-G T O142-Earth e〇-When the negative side of the DC power aE is set, a 50 Hz rectangular wave signal v3 is output from the secondary side of the output transformer Tr2 for the return signal (waveform diagram v3)
). In addition, 2 of the output transformer Tr2 for the return signal
A return signal current i6 flows on the next side (see waveform diagram i6).

When the return signal current 15 (approximately 5 A) is applied to the distribution line as described above, the display detects this and returns to normal operation. It is determined by the ammeter 163 that this return signal current i6 is flowing through the arrangement line f11! I can recognize it.

〔Effect of the invention〕

As described above, in the present invention, when the detection unit 2 is attached to the distribution line 95 so that the current transformer core 30 surrounds the distribution line 95, the signal current flowing through the distribution line 95 is detected, and the signal current flowing through the distribution line 95 is detected. It goes without saying that the display unit 3 can be operated using the detection signal, and when the coil member 42 is assembled to the first element 31 in the core 30, the coil member 42 is attached to the leg portion 31a of the first element. , 31b, the first .
The effect is that it can be assembled quickly with an extremely simple operation of just fitting it as shown in Figure 6.

Moreover, in the state where the coil member 42 is assembled to the first element 31 as described above, the coil member 42 has a structural feature of not having any projecting dimension below the first element 31. This means that since there is no overhanging dimension, the height of the display device L can be made smaller than that of the conventional one, and the wind blowing when attached to the power distribution line is weakened. It has the effect of reducing the load burden.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and Fig. 1 is a half-sectional view of an indicator for detecting a ground fault point, Fig. 2 is a front view to explain how it is attached to an electric wire, and Fig. 3 is a diagram showing the presser body. Fig. 4 is an exploded perspective view of the presser body, Fig. 5 is a perspective view of the first element in the detection section and the entire display section disassembled, and Fig. 6 is a perspective view of the cover with the cover removed. Fig. 7 is a cross-sectional view taken along the line ■-■, Fig. 8 is a cross-sectional view with part of the cover member and the coil case cut away at the line ■-■, and Fig. 9 is a cross-sectional view taken along the line ■-■.
The figure is a bottom view of the detection coil, Figure 10 is a cross-sectional view taken along the line X-X,
Fig. 11 is an enlarged sectional view taken along the line XI-XI, and Fig. 12 is an xn-
13 is an exploded perspective view of the shielding body and display cover in the display section, FIG. 14 is a perspective view of the display section in a normal state, and FIG. 15 is a perspective view of the display section in the display state. Figure 16 is a sectional view taken along the line XVI-XVI, Figure 17 is a sectional view taken along the line xva-x■, Figure 18 is a plan view of the auxiliary member, Figure 19 is a block circuit diagram of the display, and Figure 20 is a diagram of the display. Circuit diagram, Fig. 21 is a waveform diagram for explaining the operation of the display, Fig. 22 is a block circuit diagram of a transmitter for ground fault point detection, and Fig. 23 is a voltage waveform when a detection signal is sent to the distribution line. 24 is a circuit diagram of the display means, FIG. 25 is a route diagram of the distribution line, FIG. 26 is a circuit diagram showing another example of the display means, and FIG. Figure 28 is a circuit diagram showing another circuit example of a transmitter for detecting a ground fault point, and Figures 29 (A) and 29 (B) show the operation when transmitting a search signal. FIG. 30 is a waveform diagram for explaining the operation when sending a return signal. 1... Indicator for ground fault point detection, 2... Detection unit, 3
...display section, 4...base body, 10...presser body, 30
...Current transformer core, 31...First element, 32...
Second element, 42... Coil member, 43... Coil case, 46... Lead member. Figure 1 OL '/4 Figure Z n Figure 3 Figure 4 Figure 6 Figure 7 Figure 9 Figure 10 Figure 1z Figure 83 Figure 14 Figure 15 Figure 16 Figure 17 Fig. 16 Fig. 24,,z/' Fig. 23 Fig. 25 Fig. 26 Fig. 27

Claims (1)

[Scope of Claims] 1. A detection unit attached to a distribution line to detect a signal current flowing through the distribution line and output a detection signal, the detection unit being connected and integrated with the detection unit, and a display section configured to operate in response to the detection signal, and the detection section includes a base body located below the power distribution line and connected to the display section, and a display section above the power distribution line. The base body includes a U in an annular current transformer core for surrounding a space in which a distribution line is placed between the base body and the press body. A letter-shaped first element is provided, and a coil member for detecting the signal current is attached to the first element, and the holding body is provided with an inverted U-shaped element in the annular current transformer core. In the indicator for detecting a ground fault point, the second element having a shape is provided to face the first element, the coil member is
A coil case having two insertion holes formed therein for inserting the two legs of the U-shaped first element, and two coils installed concentrically with the respective insertion holes in the coil case. The coil case is connected to one end of a lead member having a plurality of core wires and a locking portion in the middle, and each end of the plurality of core wires is connected to the coil case at one end of the lead member. is connected to the terminal of the coil, and on the other hand, the case of the display section is provided with a lead-in hole for the lead member, and the hole edge of the lead-in hole has a hole for locking the locking collar. A locking portion is provided, and the state in which the coil member is attached to the first element is such that the leg portion is inserted into the insertion hole and the coil is positioned around the leg portion, and further The other end of the lead member is drawn into the case through the lead-in hole, and the locking portion is locked to the locking portion. 2. A detection section that is attached to a distribution line to detect a signal current flowing through the distribution line and output a detection signal, and a detection section that is connected and integrated with the detection section and that receives the detection signal. and a display section configured to operate the display, and the detection section includes a base body located below the power distribution line and connected to the display section, and a presser foot located above the power distribution line. The base has a U-shaped first element in an annular current transformer core for surrounding a distribution line installation space located between the base and the holding body. and a coil member for detecting the signal current is attached to the first element, while an inverted U-shaped second element of the annular current transformer core is attached to the presser body. In the earth fault point detection indicator provided in a state facing the first element, the coil member includes:
A coil case having two insertion holes formed therein for inserting the two legs of the U-shaped first element, and two coils installed concentrically with the respective insertion holes in the coil case. The coil case is connected to one end of a lead member having a plurality of core wires and a locking collar in the middle portion, and each terminal of the plurality of core wires is connected to the coil case at one end of the lead member. is connected to the terminal of the coil, and on the other hand, a lead-in hole for the lead member is drilled in the case of the display section, and a recess for retaining the locking collar is provided at the edge of the lead-in hole. The coil member is attached to the first element such that the leg is inserted into the insertion hole and the coil is positioned around the leg, and the lead member is attached to the first element. The other end is drawn into the case through the lead-in hole, and the locking collar is fixed to the bottom of the recess by a presser piece while remaining in the recess. Exploration display. 3. A detection section that is attached to a distribution line to detect a signal current flowing through the distribution line and output a detection signal, and a detection section that is connected and integrated with the detection section and that receives the detection signal. and a display section configured to operate the display, and the detection section includes a base body located below the power distribution line and connected to the display section, and a presser foot located above the power distribution line. The base has a U-shaped first element in an annular current transformer core for surrounding a distribution line installation space located between the base and the holding body. and a coil member for detecting the signal current is attached to the first element, while an inverted U-shaped second element of the annular current transformer core is attached to the presser body. In the earth fault point detection indicator provided in a state facing the first element, the coil member includes:
A coil case having two through holes formed therein for passing the two legs of the U-shaped first element; The coil case is connected to one end of a lead member having a plurality of core wires and a locking collar in the middle part, and the plurality of wires are connected to the coil case at one end of the lead member. Each terminal of the core wire is individually connected to the terminal of each of the coils, while a lead-in hole for the lead member is bored in the case of the display section, and the above-mentioned engaging hole is formed on the edge of the lead-in hole. A locking portion for locking the collar is provided, and the attached state of the coil member to the first element is such that the leg is inserted into the insertion hole and the coil is positioned around the leg. Further, the other end of the lead member is drawn into the case through the lead-in hole, so that each signal from the two coils can be separately transmitted to the drive circuit of the display section. and the locking collar is an indicator for detecting a ground fault point that is locked to the locking portion. 4. A detection section that is attached to a distribution line to detect a signal current flowing through the distribution line and output a detection signal, and a detection section that is connected and integrated with the detection section and that receives the detection signal. and a display section configured to operate the display, and the detection section includes a base body located below the power distribution line and connected to the display section, and a presser foot located above the power distribution line. The base has a U-shaped first element in an annular current transformer core for surrounding a distribution line installation space located between the base and the holding body. and a coil member for detecting the signal current is attached to the first element, while an inverted U-shaped second element of the annular current transformer core is attached to the presser body. In the earth fault point detection indicator provided in a state facing the first element, the coil member includes:
A coil case having two insertion holes formed therein for inserting the two legs of the U-shaped first element, and two coils installed concentrically with the respective insertion holes in the coil case. In addition, the coil case has one end of a lead member that is constructed by covering a plurality of core wires with a covering and has a locking part formed of one material with the covering in the middle part. are connected to the coil case by being made of one material, and each terminal of the plurality of core wires is connected to the terminal of the coil at one end of the lead member, while the case in the display section A lead-in hole for the lead member is bored, and a locking portion for locking the locking collar is provided on the edge of the lead-in hole, and the coil member is attached to the first element. The leg is inserted into the insertion hole and the coil is positioned around the leg, and the other end of the lead member is drawn into the case through the lead-in hole. In addition, the locking collar is an indicator for detecting a ground fault point that is locked to the locking portion. 5. A detection section that is attached to a distribution line to detect a signal current flowing through the distribution line and output a detection signal, and a detection section that is connected and integrated with the detection section and that receives the detection signal. and a display section configured to operate the display, and the detection section includes a base body located below the power distribution line and connected to the display section, and a presser foot located above the power distribution line. The base has a U-shaped first element in an annular current transformer core for surrounding a distribution line installation space located between the base and the holding body. and a coil member for detecting the signal current is attached to the first element, while an inverted U-shaped second element of the annular current transformer core is attached to the presser body. In the earth fault point detection indicator provided in a state facing the first element, between the storage space and the first element, and between the storage space and the second element, A positioning member is provided for each element to position the distribution line located in the storage space, and the coil member is arranged to position the two legs of the U-shaped first element. It consists of a coil case in which two insertion holes are formed for insertion, and two coils installed concentrically with each of the insertion holes in the coil case.Moreover, the coil case has a plurality of core wires. One end of a lead member having a locking flange is connected to the intermediate portion thereof, and at one end of the lead member, each terminal of the plurality of core wires is connected to a terminal of the coil, while the above display The case in the section is provided with a lead-in hole for the lead member, and the hole edge of the lead-in hole is provided with a locking part for locking the locking collar, and the lead member is connected to the first element. The attached state of the coil member is such that the leg is inserted into the insertion hole and the coil is positioned around the leg, and the other end of the lead member is inserted into the case through the lead-in hole. and the locking collar is locked to the locking part.