JPH0357075Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is attached to supports such as utility poles, and is designed to prevent accidental factors such as ground fault currents that occur due to damage and deterioration of distribution equipment such as power distribution equipment and power cables. This invention relates to an indicator that detects accidents caused by these and displays accidents.

Prior Art Conventionally, in order to indicate ground faults in power distribution lines, a solenoid is energized to attract its plunger, and the display body that is engaged with the plunger is automatically dropped outside the device or is protruded by a spring or the like. It has been proposed to display the information based on the action.

However, in this type of display method, since the display body is moved to protrude outside the device, the adjustment or structure to obtain the same protrusion is complicated, and the airtightness of the device itself is required because the protrusion outside the device is configured. the need for structure,
Furthermore, there is the problem that the display becomes larger due to the inclusion of plungers, solenoids, etc.
Therefore, there has been a demand for miniaturization.

In recent years, particular attention has been paid to the above-mentioned airtight structure, and a display part is provided inside the equipment case itself as a display device, and the display operation can be visually checked by the operator without protruding from the display case.For example, on a utility pole, etc. A device was devised that was directly attached and displayed using the bottom surface of the display.

However, with this type of display, only the lower position of the display F (the area indicated by the chain line in the drawing) can be seen visually, as shown in Figure 1, and the scaffolding etc. below the display F can be seen visually. There was a risk that confirmation would be difficult in bad cases. That is, the installation location of the display and the directionality for display confirmation are limited, and countermeasures are required.

Purpose of the invention The purpose of this invention is to provide a display that allows a worker to easily see the display status of the display and also allows the worker to easily return from the ground.

Structure of the device This device integrates a detection section that detects fault factors such as ground fault current and a display section that displays a ground fault accident based on the detection by the detection section, and a display return operation that returns the display section. In the display device in which a member is provided on the surface thereof, the display device is attached to a vertically extending support such as a telephone pole with its mounting surface as the back surface, and the display portion is constituted by a magnetic reversal display device; A permanent magnet is disposed at a corner where the lower surface of the display unit and the front face of the display unit intersect, and a permanent magnet is attached to the display return operation member, and the display return operation member is attached to the display return operation member when the magnet is close to or separated from the display unit. The display return operation member is rotatably pivoted on the surface of the display above the display so that the magnet is normally separated from the display. , the gist is that when the display return operation member is rotated against the biasing force of the biasing member and the magnet is brought close to the display unit, the display unit is reset by magnetic force. It is something.

Embodiment Hereinafter, an embodiment in which this invention is embodied in a ground fault indicator that indicates the passage of fault current in power cables and power distribution equipment will be described with reference to FIGS. 2 to 11.

In Fig. 2, frame 1 of ground fault indicator F is as follows:
It is formed into a reverse channel shape in cross section by a support plate portion 1a and a pair of side plate portions 1b which are bent at right angles from both sides of the support plate portion 1a. Same frame 1
A cutout groove 2 is provided at the lower end of the support plate portion 1a.
A notch is formed in a U-shape, and locking pieces 3 are formed on both sides of the notch groove 2 to protrude inward from each other, and at the top of the notch groove 2 there is a groove narrower than the notch groove 2. An insertion groove 4 is provided. Furthermore, a through hole 5 is provided in the upper part of the support plate portion 1a of the frame 1.

A current transformer 6 is arranged on the back side of the support plate portion 1a of the frame 1. That is, in the current transformer 6, a hole 7 formed in the center around which the primary winding 6a and the secondary winding are wound is arranged corresponding to the through hole 5, and the hole 7, the through hole 5, It is tied to the support plate 1a by a string 8 wound through the insertion groove 4 and the upper end of the support plate 1a.

In the frame 1, mounting holes 9 are formed through the lower portions of both side plate portions 1b so as to face each other. A box-shaped transparent display case 10 is disposed between both side plate portions 1b of the frame 1. That is, the display case 10 has the display window 10 on its lower end surface.
a is provided, and as shown in FIGS. 3 and 4, locking step portions 11 are protruded from both sides thereof, and a mounting shaft 12 protruding from the side surface of the locking step portion 11 is inserted into the mounting hole. It is attached by being inserted and supported by 9. The display case 10 is positioned by the side portions of the locking steps 11 engaging with the locking pieces 3 so as to protrude obliquely forward and downward through the notch grooves 2.

As shown in FIG. 4, a control circuit board 13 is adhesively fixed to the upper end of the display case 10 and is arranged to extend diagonally downward and rearward. A secondary winding wound around the transformer 6 is connected. Further, the display case 10 includes a magnetic reversal display device as a display section 14 to be described later.

A terminal 15 extending downward is fixed to one side plate portion 1b of the frame 1 by a plurality of rivets 16. A connecting piece 17 made of insulating synthetic resin extending upward is attached to the terminal 15 by the rivet 16, and the upper end of the connecting piece 17 is spaced apart from the frame 1 and the one terminal 15. The arranged terminals 18 are connected to multiple rivets 1
9, and its upper end extends upward. Both ends of the primary winding 6a of the current transformer 6 are connected to both terminals 18 and 15 by screws 20, respectively.

The frame 1, the current transformer 6, the control circuit board 13, the terminals 15, 18, and the display case 10, except for the upper end surface of the terminal 18, the lower end of the terminal 15, and the display window 10a, are provided with a periphery so as to cover them. A molded portion 21 made of a synthetic resin having excellent weather resistance and insulation properties, such as polyurethane, is formed on the surface.

As shown in FIG. 10, the mold part 21 is formed into a truncated quadrangular pyramid shape so that it becomes wider toward the rear surface, and protective walls 22 are provided on both sides of the upper surface to protrude along the vertical direction. The display main body F is formed such that the display window 10a has a front surface 21 corresponding to a mounting surface (back surface) 21a of the display main body F to a support.
b and a lower surface (side surface) 21c connecting the front surface 21b and the rear surface 21a intersect at a corner 21d.

The protective wall 2 near the upper part of the corner 21d
A return lever 23 as the return operation member is rotatably pivoted between the center portions of the return levers 2 and 2, and the return lever 23 is always biased by a coil spring 24 so as to be in the state shown in FIG. A magnet 25 is attached to the back surface of the return lever 23, and when the return lever 23 is rotated, the magnet 25
are arranged close to or separated from the display section 14. Further, a pair of band holes 26 are transparently provided near the upper portions of both of the protection walls 22, and the display main body F is attached to the utility pole P via the band holes 26 with a mounting band B.

Next, the control circuit provided on the control circuit board 13 will be explained with reference to FIG.

A primary winding 6a of a current transformer 6 is connected in series to a grounding wire 27 of a power cable or a power distribution device (switch S in this embodiment) via both terminals 15 and 18. A full-wave rectifier 28 is connected to both terminals of the secondary winding of the current transformer 6 via a choke coil L. Note that Z is a surge absorber connected between both terminals of the secondary winding of the current transformer 6.

The display section 14 and a thyristor SCR as a switching element are connected in series to both the positive and negative terminals of the full-wave rectifier 28. This thyristor SCR has an anode connected to the display section 14,
A cathode is connected to the negative terminal of the full-wave rectifier 28.

Positive terminal of full wave rectifier 28 and thyristor
A capacitor C for charge storage is connected between the cathode terminal of the SCR, a resistor RO for discharging the capacitor, a Zener diode ZD as a thyristor temperature compensation element, a resistor R1 for applying gate voltage, and a resistor. A series circuit of R2 is connected. Note that the resistor R1 is not necessarily required, and if the resistor R1 is omitted, the resistor R2
is a thyristor when the Zener diode ZD is conductive.
It is sufficient if the resistance value is set to be equal to or higher than the gate trigger voltage of the SCR.

The thyristor is connected to the positive terminal of the resistor R2.
The gate terminal of SCR is connected.

The Zener diode ZD is designed not to conduct unless a Zener voltage or higher is applied, and the Zener voltage is applied to the thyristor.
The resistors R1 and R2 are set so that a sufficient gate voltage is applied to the gate terminal even when the SCR is at low temperature, and the gate voltage supplied to the thyristor SCR is required when the Zener diode ZD is conductive and the gate voltage is supplied to the thyristor SCR. The resistance value is set to be equal to or higher than the gate trigger voltage.

The current transformer 6, a full-wave rectifier 28 provided in this control circuit, resistors R0, R1, R2, a thyristor SCR, and a capacitor C constitute a detection section.

To explain the display section 14, as shown in FIG. 6 and FIG. The stator 31 is rotatably supported around the disk 2.
Magnetic pole portion 32a and disk 2 corresponding to the S pole of No. 9
It is formed to have a magnetic pole portion 32b corresponding to the N pole of No.9. Note that the stator 31 is preferably formed of a material with low coercive force. Between the two magnetic pole portions 32a and 32b, the same magnetic pole portion 32a,
The coil 33 connected to the connection terminal of the display section is wound so that the coil 32b is magnetized with the same polarity as the magnetic poles at both ends of the disk 29 in the state shown in FIG.

Front surface 34a and back surface 34b of the disk 29
Labels of different colors (in this embodiment, the front side 34a is black and the back side 34b is red) are displayed on the .

When a detection current flows through the coil 33, the magnetic pole portion 32a becomes the S pole as shown in FIG.
The magnetic pole portion 32b is magnetized to the north pole, and the disk 29 is reversely rotated so that its north pole faces the magnetic pole portion 32a (south pole) and its S pole faces the magnetic pole portion 32b (north pole). A label attached to the back surface 34b is displayed to the outside.

Further, when the return lever 23 is rotated to the position shown by the chain line in FIG. 10, the display section 14 easily reverses the disk 29 by the magnet 25 attached to the return lever 23, and the normal position shown in FIG. It is now possible to return to the display state.

As shown in FIG. 6, the display device of this embodiment initially displays a mark on the surface 34a of the disk 29 to the outside to indicate that it is in a steady state.

The display body F configured as described above is connected to a telephone pole P.
A case will be described in which the power cable is connected to the grounding wire 27 of the switch S installed in the utility pole P and is arranged at an appropriate height around the outer periphery of the utility pole P (see FIG. 11).

When a ground fault current flows through the grounding wire 27 due to deterioration of the switch S in this installed state, a transformed current is output from the current transformer 6, and after the transformed current is rectified by the full-wave rectifier 28, the capacitor C to charge.

When the capacitor C is charged and the voltage increases, and becomes higher than the Zener voltage of the Zener diode ZD, and the Zener diode ZD becomes conductive, the capacitor voltage is divided between the resistor R1 and the resistor R2, and the voltage across the resistor R2 is applied to the thyristor. SCR gate,
Applied across the cathodes.

When a sufficient gate voltage is applied to the thyristor SCR, the thyristor SCR turns on and becomes conductive. Then, the charged capacitor C is discharged and current flows to the display section 14.

When a current flows through the coil 33 of the display section 14,
As shown in FIG. 7, the magnetic pole part 32a is magnetized to the S pole, and the magnetic pole part 32b is magnetized to the N pole. (pole).
As a result, the mark attached to the back surface 34b of the disk 29 is displayed so as to be visible from the outside through the display window 10a, thereby indicating a ground fault accident.

The mark on the back surface 34b can be visually recognized in the downward and horizontal angle α=approximately 90°, and it can be easily and clearly determined that a ground fault has occurred in the grounding line 27. can. Note that if the display window 10a is made of a convex lens, the sign can be enlarged and displayed.

After the ground fault point has been discovered as described above, in order to restore the display on the display, the return lever 23 is moved away from the magnetic reversal display device as shown in FIG. 10, as shown by the chain line. It rotates against the coil spring 24 until it reaches the state. Then the return lever 23
Since the magnet 25 is close to the magnetic reversal display device,
The disk 29 is reversed by the magnetic force of the magnet 25 and returns to its original state, and is ready to respond to the next ground fault. Note that, when the operating force is released, the return lever 23 returns to its original state due to the biasing force of the coil spring 24.

Furthermore, when the return lever 23 is rotated back, it is held in a standby state by the biasing force of the coil spring 24, so that it will not malfunction due to wind, rain, etc.
Furthermore, since the return lever 23 has a large stroke, the operator can perform the return operation without making any mistakes while confirming the return operation on the display section 14.

Now, in the above embodiment, the primary side of the current transformer is used as a grounding line for power cables and power distribution equipment, but the current transformer may be attached to a power distribution line and used as an overcurrent detection circuit for the power distribution line.

In this case, the Zener voltage of the Zener diode ZD is such that it does not conduct with the output current output from the full-wave rectifier 28 when a normal load current is flowing, and is output from the full-wave rectifier 28 when an overcurrent flows. It is set to conduct only at the output current.

Therefore, when a normal load current is flowing through the distribution line (not shown), some alternating current is output from the current transformer 6, and after being rectified by the full-wave rectifier 28, the alternating current is passed through the capacitor C. is consumed by the resistor RO. At this time, the Zener diode ZD does not conduct because a voltage higher than the Zener voltage is not applied, and therefore the thyristor SCR is in an off state.

If an overcurrent flows in the distribution line (not shown) in this state, a transformed current is output from the current transformer 6,
Thereafter, as in the previous embodiment, the thyristor SCR as a switching element is made conductive, and the discharge current from the capacitor C is output to the display section 14.

The effects in this case are the same as those in the previous embodiment.

Effects of the device As detailed above, this device is used to attach the display to a vertically extending support such as a telephone pole with its mounting surface as the back, and to separate the display from the bottom and front of the display. By placing the display at the corner where the display unit intersects, it is possible to effectively display the display operation over a wide range, so that the operator can reliably check the display not only from the bottom position of the display unit but also from the front position. It has the effect of being able to.

In addition, the display section is constituted by a magnetic reversal display device, and a permanent magnet is attached to the display return operation member, and the display return operation member is connected to the display section so that the magnet approaches or is separated from the display section. is rotatably attached to the surface of the display above the display, and
The display return operation member is rotated and biased by a biasing member so that the magnet is normally separated from the display section, and the display return operation member is rotated against the biasing force of the biasing member so that the magnet When the magnet is brought close to the display part, the display part is returned to its original state by magnetic force, so that the worker can move the display return operation member so that the magnet approaches the display part while checking the display state of the accident occurrence. The display unit can be returned to its original state simply and easily by simply rotating it, and since the rotating operation of the display return operating member has a long stroke, the operator can return the display unit reliably without making any erroneous operations. When the operator leaves the operator's hand after the return operation and the display return operation member is rotated back to its original state by the urging force of the urging member, the display returns to its original state. Since the device is held in a standby state along the surface of the device, there is no possibility of malfunction due to wind, rain, etc.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram showing a state in which a conventional display device is installed, Fig. 2 is a perspective view of an embodiment of the display device embodying this invention, excluding the molded part, and Fig. 3 is the same. Figure 4 is a front view of the main parts excluding the mold part, Figure 4 is a side sectional view of the main parts, Figure 5 is a control circuit diagram of this display, Figure 6 is a perspective view of the display, and Figure 7 is the same display. 8 is a front view of the entire display, FIG. 9 is a bottom view of the entire display, and FIG. 10 is a partially cutaway side sectional view of the entire display. FIG. 11 is a schematic explanatory diagram of this display device attached to a utility pole. 1...Frame, 6...Current transformer, 10...
Display case, 10a...Display window, 13...Control circuit board, 14...Display section, 15, 18...Terminal, 21...Mold section, 21a...Mounting surface (back), 21b...Front surface, 21c...Bottom surface (side surface),
21d... Corner, 23... Return lever as a display return operation member, 24... Coil spring as a biasing member, 25... Magnet, 26... Band hole, 27
...Grounding wire, 28...Full-wave rectifier, 29...Disc, 30...Rotating shaft, 31...Stator, 33
... Coil, SCR ... Thyristor, R0, R1,
R2...Resistor, C...Capacitor, ZD...Zener diode, B...Band, F...Display, P
...Telephone pole equipment.

Claims (1)

[Scope of claim for utility model registration] A display that integrates a detection unit that detects fault factors such as ground fault current with a display unit that displays a ground fault accident based on the detection by the detection unit, and that causes the display unit to return to its original state. In a display device in which a return operation member is provided on its surface, the display device F is attached to a vertically extending support such as a utility pole P, with its mounting surface serving as the back surface 21a, and the display portion 14 is magnetically reversed. It is constituted by a display device and is arranged at a corner 21d where the lower surface 21c of the display F and the front surface 21b of the display F intersect, and a permanent magnet 25 is attached to the display return operation member 23, and the display return operation member 23 is provided with a permanent magnet 25. 23 to the magnet 25
is rotatably pivoted on the surface of the display F above the display section 14 so that it is close to or separated from the display section 14, and the display return operation member 23 is connected to the magnet 2.
5 away from the display section 14.
The display return operation member 23 is rotated by the urging member 24.
A display device characterized in that the display section 14 is returned to its original state when the display section 14 is rotated against the urging force of the display section 14 and brought close to the display section 14.