JPH062149Y2 - Ground fault detection device with insulated operating rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is intended to solve the following problems.

(Field of Industrial Application) The present invention relates to a ground fault detection device with an insulating operating rod used when searching for a ground fault in a high-voltage power distribution line.

(Prior art) Conventionally, when a ground fault occurs in an overhead high voltage distribution line, power transmission to the distribution line is temporarily stopped and a high voltage pulse is applied to the distribution line in the power failure state. Then, a ground worker having a receiver with an antenna searched for the pulse current of the line flowing through the accident point.

In other words, the high-voltage pulse current applied to the line by the high-voltage voltage-applying device flows through the line to the ground from the fault point, and then flows in the circuit returning to the high-voltage voltage-applying device, so that the worker holds a high voltage while holding the receiver. It walks along the distribution line, detects the above-mentioned high-voltage pulse current, and searches for the ground fault accident point by a large change in the deviation of the detection meter of the receiver before and after the accident point.

However, an actual high-voltage power distribution line has a shared ground line, a double overhead section, etc., and is easily affected by an AC current, and it is extremely difficult to accurately search for an accident point in the ground search.

Therefore, an improved proposal has been made in which the detection antenna is directly hooked to a distribution line through which a high-voltage pulse current flows to detect the presence or absence of the current (for example, Japanese Patent Laid-Open No. Sho 5).
7-3056).

By the way, there is still a problem with this antenna direct hooking method.

That is, as shown in FIG. 12, this antenna direct hooking method is used in the detection unit (100) including the antenna and the detection unit described above.
Receiver and display for processing signals from (100)
(101) is a separate device (separate body), one of which is installed on the high-voltage distribution line (102) and the other is installed on the ground (103) for use. ) Lead wire between (104)
I was connected.

Therefore, there is a risk that a high voltage will be applied to the lead wire (104) by the power charging device (105). There was a problem such as a malfunction due to the induction of. In addition, (106) in the figure
Is the lead wire for the voltage applying device, (Rg) is the ground fault resistance at the ground fault accident point,
(P ₁ ) indicates a utility pole.

Further, in the above, work efficiency is high, for example, a person (108) who hooks the antenna on the high-voltage distribution line and a person (109) who operates while watching the receiving device on the ground are required during the exploration. There was also the problem of being bad.

Further, in recent years, as shown in FIG. 13, as an improvement plan of the antenna direct system, a detecting device (100 ') and a receiving device are provided.
There is one in which (101 ') is integrated with an insulating operating rod (110) (see the above publication). This is a detection device (10) for detecting a high-voltage pulse current at one end of the insulated operating rod (110).
0 ') and a receiving device (101') for receiving and processing a signal from the detecting device (100 ') at the other end, and a lead wire (111) penetrating both devices at both ends through the operating rod. The apparatus has a structure in which the antenna is connected to the high-voltage distribution line by directly hooking the antenna of the above-described detection apparatus formed in a hook shape to detect the high-voltage pulse current flowing through the line.

However, there is still a problem with the above device.

That is, in the above-mentioned device, the detecting device and the receiving device provided at both ends of the insulating operating rod are connected by the lead wire penetrating through the operating rod as described above. There was a safety issue for operators who grasp and operate.

Also, when an operator operates on a pole, the detection device at the tip is used by directly hooking it on an electric wire. In that case, however, the length of the operating rod cannot be adjusted freely, so a worker with a short operating rod cannot use it. Had to approach the high-voltage distribution line, which was dangerous, and conversely, it was difficult to work with a long operating rod. Further, if the operation rod is made to be expandable and contractible, there is a problem that the operation is impossible due to disconnection of the lead wire or entanglement of the lead wire.

(Problems to be solved by the invention) Except for the above-mentioned conventional problems, the present invention detects a ground fault accident.
A human operator can operate from a low place, secondly, there is no risk of electric shock, and thirdly, when the operation rod is extended or retracted, the handling of lead wires can be done safely, etc. The present invention is intended to provide such a detection device.

(Means for Solving Problems) The present invention is directed to a detection device for detecting a high-voltage pulse current flowing in a high-voltage distribution line, a reception device for receiving and processing a detection signal from the detection device, and a signal from the reception device. The sound generator that operates according to the above, and the power supply that drives the receiving device and the display device are housed in an insulating case that has a hook part that can be hooked on the high-voltage distribution line. The insulating case is configured such that the sound from the sound generator is transmitted from the upper opening of the hollow pipe to the lower opening of the hollow pipe with respect to the upper end of the expandable insulating operation rod having a hollow pipe shape for transmitting sound. The present invention provides a ground fault accident detection device with an insulating operation rod connected so as to be transmitted to a vehicle.

The action is that when the pulse current from the power applying device flows through the high voltage distribution line in a state where the hook portion is hooked on the high voltage distribution line, the detection device detects it and outputs a detection signal. The detection signal is processed by the receiving device and the sound generator sounds. The ringing sound reaches the lower end opening through the upper end opening of the pipe-shaped insulated operating rod, and is transmitted to the operator's ear through the opening.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 11.

(1) allows a part of it to be hooked on a high-voltage distribution line.
An insulating case made of synthetic resin with a hook (1a)
Is divided into two parts, the main body part (1b) and the connecting part (1c).
The main body (1b) of the above, the notch (2a) in the hook (1a)
Are arranged in the same manner as the horseshoe-shaped iron core (2).
Detection device consisting of coil (3) wound around iron core (2)(Four)
And the detection deviceTable (4)Received signals from
Receiver(Five)And the receiver(Five)Operated by the signal of
Display device comprising a light emitting element (6a) or the like(6)When
Is stored.

The hook portion (1a) formed on the lower side of the insulating case (1) is a guide portion (1) that expands outward (downward).
a ₁ ) followed by a groove-shaped wire fitting part (1 a ₂ ) extending to the center (upward), so that this part can be securely hooked to an insulated wire (high voltage distribution line) up to a thickness of about 125 SQ. Is formed in.

Further, the guide portion (1a ₁₎ in the lower tip thereof (1
A through hole 1a ″ is provided in a position near the light emitting element (6a) formed of a light emitting diode in the vicinity of a ₁ ′), and an operator operating from below visually confirms the blinking state of the light emitting element from below. You can do it.

(7) is a power source composed of a dry battery arranged at an upper part in the connecting portion (1c) of the insulating case (1), and the detection device (4)
The signal for driving the receiving device (5) and the display device (6) . (6b) is a sound generator (buzzer) mounted below the power supply (7)
As described above, in the present accident detection device, the display means of the display device (6) is provided with two types, one by light emission and one by sound. (8a) and (8b) are buffer bodies made of sponge rubber or the like for fixing the iron core (2) housed in the main body part (1b) and the power source (7) housed in the connection part (1c), respectively (9 ) Is a cap-like lid made of an insulating member such as rubber, which closes the upper opening of the insulating case (1) and presses and fixes the power supply (7) from above, (10)
Shows a test switch located below the connecting portion (1c) for checking a circuit.

Further, (11) the mechanical strength and inserts than its front end (11a) connecting hole (1c ₁₎ below, and fixed to the same part (1a) of the connecting part (1c) of the insulation case (1) Insulation It is a pipe-shaped insulated operating rod made of synthetic resin such as FRP, which has the property to detect the sound generated by the sound generator (6b) when it is fixed to the connecting part (1c), that is, the detection. The tip of the tip so that the sound is relayed through the hollow part (11b) and is reliably transmitted to the worker located below.
(11a) is connected in an open state. However, even in this case, if the insulating case (1) and the insulating operating rod (11) are detachable, for example, by a screw connection structure, both can be easily detached and reduced in size, which is convenient for transportation.

In addition, the operating rod (11) can be adjusted within the range of 90 cm to 2.5 m in order to facilitate the operation on the pole, and each operating rod has a length of about 90 cm. Moreover, a plurality of hollow operating rod elements 11 ', 11 ", 11'" each having an open upper and lower end are made to have an appropriate length by a pipe-shaped screw connection body (12) made of an insulating member such as synthetic resin. Used in combination, the lower end of the operating rod element 11 ′ connected to the insulating case (1) and the other operating rod element 1
Screw connecting bodies (12) or (12 ') are fixed to the lower and upper ends of 1 "and 11'", respectively, and the operating rod elements are sequentially connected through the screw connecting bodies (12) and (12 '). It is designed to work.

That is, for the screw portion (12a) formed on the lower inner peripheral surface of the screw coupling body (12) integrally fixed to the lower end outer circumference (11c) of the operation rod element, the upper end outer circumference (11d) of another operation rod element is formed. A screw portion (12b) formed on the upper outer peripheral surface of the fixed screw connecting body (12 ') is screwed to sequentially connect the operating rod elements. However, in addition to the expansion and contraction structure of the operation rod, a slide system commonly used in rod antennas may be used. FIG. 9 is for explaining the circuit configuration of the ground fault accident detection device (A) described above. The block diagram and FIG. 10 are waveform diagrams of the respective portions shown in (a) to (g) of the block diagram. The device is a detection device (4) consisting of an antenna (CT) for detecting a high-voltage pulse current flowing through a high-voltage distribution line, and only the detected signal is passed, and a passage of a commercial frequency signal is blocked. Filter circuit (5 ₁ ), Filter circuit (5 ₁ )
Integrating circuit for integrating the detection signal that has passed through the ₁₎ (5 _2), filter circuit (5 ₃ so as to prevent passage of the high frequency component of the output signal integration circuit (5 _2)), filter circuit (5 ₃₎ And rectification circuit (5 ₄ ) for amplifying and rectifying the output of the receiver
(5) , a display device (6) comprising a light emitting element (6a) and a sound generator (6b), and a power supply (7) for driving the receiving device (5) and the display device (6). ing.

The waveform diagram of FIG. 10 shows the states before and after the ground fault accident point when a ground fault accident occurs in the high-voltage distribution line, respectively.

On the other hand, if no accident occurs, the waveform will be the same as that after the accident point over the entire line. In other words, only the charging current for the ground capacitance or the like flows through the line, and the display device 6 does not perform any operation as shown in (g ').

The ground fault detection device ( A ) of the present invention having such a configuration is used as follows.

As shown in Fig. 11, the high voltage distribution device (15) is used for the high voltage distribution line (13) and the ground (14) in the section of the overhead high voltage distribution line where the ground fault occurs. Apply the high voltage pulse according to (16). An accident point exploration worker climbs up to a utility pole (P ₁ ) and hooks the detection device part (hook part) of the detection device (A) above on the high-voltage distribution line (13) to check if there is a high-voltage pulse current flow. Display device sound (intermittent sound synchronized with pulse current)
Also, check by the presence or absence of light (a blinking signal that is also synchronized with the pulse current). In the figure, (17) indicates a worker, (18) indicates a ground wire, (Rg) indicates a ground fault resistance, and (I) indicates a pulse current flowing through a high-voltage distribution line.

In the above embodiment, a search coil may be used in addition to the antenna (current transformer) as the pulse current detection method of the detection device (4) .

(Effect of the Invention) As described above, according to the present invention, the detecting device, the receiving device, the display device, and the power source are all housed in the insulating case 1, and one end of the retractable insulating operating rod 11 is connected to the insulating case 1. The insulation distance between the insulating case 1 and the worker by the rod 11 can be sufficiently secured, and therefore, the electric shock accident of the worker who holds the operating rod 11 and operates can be prevented.

Moreover, the insulating case 1 allows the sound from the sound generator 6b to pass through the upper opening of the hollow pipe from the upper opening of the hollow pipe to the upper end of the expandable insulating operation rod 11 having a hollow pipe shape for transmitting sound. Since the operation rod 11 is connected so as to be transmitted to the lower opening, the operation rod 11 is electrically irrelevant to the insulating case 1 accommodating the electric circuit portion of the detection device (the lead wire does not penetrate through the operation rod). There is a feature that can be done. For this reason, the operating rod 11 can be made to have a retractable structure without a lead wire, and the operating rod of the optimum length can be adjusted when hooked on a high-voltage distribution line from a low place, which has the effect of facilitating safe work. is there.

Further, since the operating rod 11 has no lead wire, there is no disconnection or induction from the lead wire, and malfunctions due to these can be prevented.

When connecting the operating rod 11 and the insulating case 1, a pipe-like one is used, and the open end of the operating rod 11 is brought close to the sound generator of the display device so that the operating rod 11 is connected. Even the lower worker who holds and operates
In the section up to the accident point, the detected sound is relayed through the hollow part of the rod and is reliably transmitted from the lower opening.Therefore, it is possible to clearly distinguish the change in the detected sound in the section before and after the accident point. Yes, it is possible to further improve the safety and workability during inspection.

[Brief description of drawings]

The drawings show an embodiment of the present application. FIG. 1 is a vertical cross-sectional view showing a main part of a ground fault accident detection device with an operating rod as seen from the front, and FIG. 2 is a vertical cross-sectional view as seen from the left side of FIG. , Fig. 3 shows the first
FIG. 4 is a vertical cross-sectional view of the drawing seen from the right side, FIG. 4 is a cross-sectional view of the lid body partially cut away, and FIG. 1 is a plan view, and FIG. FIG. 6 is a front view of the ground fault accident detection device of the present application, FIG. 7 is a right side view showing only part of FIG. 6, and FIG. 8 is a bottom view seen from the direction of arrow VII in FIG. FIG. 9 is a block diagram showing a circuit of the ground fault accident detection device of the present application, FIG. 10 is a waveform diagram of each part of the block diagram of FIG. 9, and FIG. 11 is an explanatory diagram showing an exploration situation using the detection device of the present application. , FIG. 12 is an explanatory view showing a conventional exploration situation, FIG. 13 is an explanatory view showing another conventional detection device, and FIG. 14 is an enlarged sectional view of the insulating operation rod in FIG. 13, respectively. ( A ) ・ ・ ・ Ground fault detection device, (1) ・ ・ ・ Insulation case, (1
a) ... Hook part, (4) ... Detecting device, (5) ... Receiving device, (6) ... Display device, (6a) ... Light emitting element, (6b)
・ ・ ・ Sound generator, (7) ・ ・ ・ Power supply, (11) ・ ・ ・ Insulation operating rod, (11a) ・ ・ ・ Tip, (11b) ・ ・ ・ Hollow part, (13) ・ ・ ・
High voltage distribution line

Claims (1)

[Scope of utility model registration request] 1. A detection device for detecting a high-voltage pulse current flowing in a high-voltage distribution line, a reception device for receiving and processing a detection signal from the detection device, and a sound generator operable by a signal from the reception device. And a power source adapted to drive the receiving device and the display device are housed in an insulating case partially provided with a hook portion that enables hooking to a high-voltage distribution line, and the insulating case is configured to generate a sound. To connect the sound from the sound generator to the lower opening of the hollow pipe to the upper end of the expandable insulating operating rod in the shape of a hollow pipe for transmission. Characteristic ground fault detector with insulated operating rod