JP6246745B2 - CT receiver - Google Patents

Description

  The present invention relates to a CT receiver used for specifying an accident point in an accident point search at the time of a distribution line accident.

  The fault point (ground fault point) search is performed using a search device composed of a transmitter, a power transmission cable, and a CT receiver. The transmitter is a DC power source that is grounded and applies a DC pulse voltage to the electric wire. The CT receiver includes a CT sensor that detects whether or not a ground fault current flows through the electric wire when the transmitter applies a DC pulse voltage, and an LED that notifies the worker of the detection result in a light emission mode, It has. The CT sensor is attached to the tip of a long operating rod. The power transmission cable connects the transmitter and the electric wire.

  Next, the accident point search method will be described. For example, in a utility pole with three wires, the worker first connected one end of the power cable to the transformer cutout switch in the fault power outage section, and connected the other end to the transmitter. DC pulse voltage can be applied to the wires. Moreover, another worker performs the operation | work which installs CT receiver with respect to three electric wires, respectively.

  Then, after installing the CT receiver on the electric wire, a worker on the transmitter side operates the transmitter to apply a DC pulse. Specifically, the transmitter applies each DC pulse voltage at intervals of 2 seconds at 5 kV and at intervals of 6 seconds at 10 kV · 15 kV. When the DC pulse voltage is applied, a pulsed ground fault current flows in a section having an accident point in the electric wire between the utility poles. When the CT sensor detects this ground fault current, the LED emits light. When another worker visually recognizes the light emission mode of the LED at this time, the electric wire having the accident point is specified.

  Moreover, as this type of conventional technology, as disclosed in Patent Document 1, the housing includes a CT receiver and an LED for notifying the detection result of the CT receiver. A power point terminal for accident point exploration has been proposed.

JP 2011-163854 A

  By the way, in the current accident point exploration, in order to perform exploration efficiently, the work is performed by ascending a pole to the power pole at the branch source. However, when a distribution line accident occurs, it is often in an environment where workability is bad such as in bad weather or at night, so misdirection of the CT receiver or misjudgment of the operator mistakes the direction of the accident point Sometimes. Due to this, there is often an event that the worker spends time unnecessarily and the recovery of the accident is delayed.

  In particular, regarding the misdirection of the accident point direction, one of the causes is that the display method at the time of detecting the pulse current of the existing CT receiver is LED light emission or buzzer sound. That is, it can be understood that the CT receiver detects the ground fault current by the LED light emission and the buzzer sound. However, it is difficult for the operator to determine the direction in which the ground fault current flows from the LED light emission and buzzer sound in the CT receiver.

  In addition, when the connection is complicated at the edge of the branch wire, the order of fault point search may be skipped. Furthermore, if it takes too much time to search for the accident point, the water at the ground fault point evaporates and the accident point may disappear temporarily.

  The present invention solves such problems and makes it possible to reliably determine the direction in which the ground fault current flows along with the detection of the ground fault current at the time of fault point search. An object of the present invention is to provide a CT receiver that realizes the improvement.

  In order to achieve the above object, the present invention comprises the following configuration.

(1) A main body hooked on a distribution line, and a pulse-shaped ground fault current provided in the main body, arranged side by side along the distribution line when the main body is hooked on the distribution line, and flowing in the distribution line. First CT sensor and second CT sensor to detect, light emitting unit disposed in the main body, and when the first CT sensor detects a ground fault current first in time and the second CT sensor first in time A CT receiver, comprising: a light emission control unit that causes the light emitting unit to emit light in a different light emission mode when a ground fault current is detected.

  According to (1), the worker can easily determine the ground fault current flowing in the distribution line and the direction in which the ground fault current flows by checking the light emission mode of the light emitting unit. become. Thereby, in the distribution line, it is possible to easily determine whether there is an accident point on the left or right side with respect to the CT receiver, and it is possible to improve workability in the accident point search.

(2) In (1), the light emitting unit includes a first light emitting unit corresponding to the first CT sensor and a second light emitting unit corresponding to the second CT sensor, and the light emission control unit includes the first CT sensor. There is emitting the first light emitting portion when detecting the ground fault current to temporally earlier, emitting the second light emitting portion when said first 2CT sensor detects ground fault current to temporally earlier A CT receiver, characterized in that

  (3) The CT receiver according to (2), wherein the first light emitting unit and the second light emitting unit emit light in a display mode of an arrow indicating a direction in which a ground fault current flows.

  According to (2) and (3), it is possible to inform the worker of the direction in which the ground fault current flows in an easy-to-understand manner.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to discriminate | determine reliably the direction through which a ground fault fault current flows with the detection of a ground fault fault current, and it becomes possible to improve workability | operativity in accident point search.

It is a perspective view which shows the external appearance of CT receiver 1 in one Embodiment of this invention. It is explanatory drawing which shows the structure of CT receiver 1 in one Embodiment of this invention. 2 is a block diagram showing circuit configurations of the first CT sensor 20 and the first CT sensor 20. FIG. It is a block diagram which shows the circuit structure of CT receiver 1 in this embodiment. It is explanatory drawing which shows the usage condition of CT receiver 1 in this embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing an appearance of a CT receiver 1 according to an embodiment of the present invention. 2A and 2B are explanatory diagrams showing the configuration of the CT receiver 1 according to an embodiment of the present invention. FIG. 2A is a front view, FIG. 2B is a side view, and FIG. 2C is a bottom view. It is. The CT receiver 1 includes a housing 10 corresponding to a main body, a first CT sensor 20, a second CT sensor 22, a first light emitting unit 30, and a second light emitting unit 32.

  The housing 10 includes a rectangular parallelepiped storage portion 10a, and a hook portion 10b formed in a bowl shape extending horizontally from the upper end of the storage portion 10a and extending downward. That is, the housing 10 is formed in a substantially J shape when viewed from the side. The housing | casing 10 is hooked on the distribution line 110 by inserting in the hook part 10b in the distribution line 110 (refer FIG. 5).

  Further, the housing 10 includes a connecting portion (not shown) connected to the distal end portion of the insulating operation rod 100 on the lower surface of the storage portion 10a.

  The first CT sensor 20 and the second CT sensor 22 output a detection signal when a ground fault current flowing through the distribution line 110 is detected. The first CT sensor 20 and the second CT sensor 22 are disposed inside the housing 10.

  FIG. 3 is a block diagram showing a circuit configuration of the first CT sensor 20, and the first CT sensor 20 includes a core 20a and a wave rectifier circuit 20b. The core 20 a is configured in a U shape, and the core 20 a is disposed so as to surround the distribution line 110 when the housing 10 is hooked on the distribution line 110. The core 20a generates an induced current from a change in the magnetic field near the core 20a due to a ground fault current flowing through the distribution line 110. The wave shaping circuit 20b arranges the induced current into a pulse wave and outputs the pulse wave, and the pulse wave is transmitted to the light emission control unit 50 as a detection signal. Details of the light emission control unit 50 will be described later.

  The second CT sensor 22 includes a core 22a and a wave regulation circuit 22b. Since the core 22a and the wave shaping circuit 22b are the same as the core 20a and the wave shaping circuit 20b of the first CT sensor 20, description thereof will be omitted. When the housing 10 is hooked on the distribution line 110, the core 20 a and the core 22 a are arranged side by side along the distribution line 110.

In FIG. 1, the first light emitting unit 30 emits light when the first CT sensor 20 detects a ground fault current first in time , and the second light emitting unit 32 includes the second CT sensor 22. temporally and light is emitted when detecting ground fault currents above. The 1st light emission part 30 and the 2nd light emission part 32 consist of LED, and are arrange | positioned along with the front end surface of the hook part 10b. Moreover, the 1st light emission part 30 and the 2nd light emission part 32 light-emit in the display mode of the arrow.

  In the present embodiment, as shown in FIG. 2, the first CT sensor 20 (core 20 a) is disposed on the left side and the second CT sensor 22 (core 22 a) is disposed on the right side, and the second light emitting unit 32. Are arranged on the left side, and the first light emitting unit 30 is arranged on the right side. Further, the second light emitting unit 32 is visually recognized as a leftward arrow, and the first light emitting unit 30 is visually recognized as a rightward arrow.

FIG. 4 is a block diagram showing a circuit configuration of the CT receiver 1 in the present embodiment. The CT receiver 1 further includes a light emission control unit 50, a buzzer 52, and a power supply unit 54. Light emission control unit 50, a detection signal from the 1CT sensor 20, either of the detection signals from the 2CT sensor 22 determines whether it has received earlier in time, the detection signal received earlier in time The light emitting unit corresponding to the outputted CT sensor is controlled to emit light. The light emission controller 50 is connected to the first CT sensor 20, the second CT sensor 22, the first light emitter 30, the second light emitter 32, and the buzzer 52.

The buzzer 52 rings simultaneously with the light emission of the first light emitting unit 30 or the second light emitting unit 32 under the control of the light emission control unit 50.
The power supply unit 54 is a power source for the first CT sensor 20, the second CT sensor 22, the first light emitting unit 30, the second light emitting unit 32, and the buzzer 52.

Next, the operation of the CT receiver 1 when searching for an accident point will be described.
The worker attaches the CT receiver 1 to the tip of the insulating operation rod 100 before the accident point search operation. Then, the operator operates the insulation operation rod 100 while applying the DC pulse voltage from the transmitter (not shown) of the exploration device, and the CT receiver is connected to the distribution line 110 as shown in FIG. Hook 1

  At this time, when a ground fault current flows through the distribution line 110, the first CT sensor 20 and the second CT sensor 22 detect the ground fault current and transmit a detection signal to the light emission control unit 50. .

The light emission control unit 50 determines which detection signal of the first CT sensor 20 or the second CT sensor 22 is received first in time . If the result of determination by the light emission control unit 50 is that the first CT sensor 20 is ahead in time , the first light emitting unit 30 emits light and the buzzer 52 is sounded, and the second CT sensor 22 is advanced in time. If so, the first light emitting unit 30, the second light emitting unit 32, and the buzzer 52 are controlled so that the second light emitting unit 32 emits light and the buzzer 52 sounds.

  In addition, when the ground fault current does not flow through the distribution line 110, the first light emitting unit 30, the second light emitting unit 32, and the buzzer 52 of the CT receiver 1 do not operate.

  And an operator can grasp | ascertain the direction through which a ground fault fault electric current flows by confirming the light emission aspect of the 1st light emission part 30 and the 2nd light emission part 32 from the ground. That is, the direction of the emitting arrow is the direction in which the ground fault current flows. Here, since the 1st light emission part 30 and the 2nd light emission part 32 have faced the ground side, the operator can confirm the light emission aspect of the 1st light emission part 30 and the 2nd light emission part 32 easily. is there. As a result, since an accident point exists on the downstream side in the direction in which the ground fault current flows with respect to the CT receiver 1, the worker should investigate the left or right side with respect to the CT receiver 1. It becomes possible to easily judge.

  As described above, according to the present embodiment configured as described above, by confirming the light emission mode of the first light emitting unit 30 and the second light emitting unit 32, the direction in which the ground fault current flows in the distribution line 110 can be easily set. It becomes possible to determine. As described above, it is possible to reliably determine that the ground fault current has been detected and the direction in which the ground fault current flows, and to improve the workability related to the accident point search.

Further, according to this embodiment, when the first CT sensor 20 detects the ground fault current first in time, only the first light emitting unit 30 emits light, and the second CT sensor 22 first time in the ground fault. When the current is detected, only the second light emitting unit 32 emits light. This makes it possible to easily determine the difference in the light emission mode, and to reliably determine the direction in which the ground fault current flows.

  In addition, according to the present embodiment, the first light emitting unit 30 and the second light emitting unit 32 emit light in the direction of the arrow indicating the direction in which the ground fault current flows, so that the direction in which the ground fault current flows is more easily understood It is possible to notify the staff.

  As mentioned above, although embodiment of this invention was described, embodiment of this invention is not restricted to embodiment mentioned above. For example, the first light emitting unit 30 and the second light emitting unit 32 may be color-coded. In addition, the arrangement location of the first light emitting unit 30 and the second light emitting unit 32 can be set as appropriate to a location that is easy for the operator to see.

DESCRIPTION OF SYMBOLS 1 CT receiver 10a Storage part 10b Hook part 20, 22 CT sensor 20a, 22a Core 20b, 22b Wave shaping circuit 30 1st light emission part 32 2nd light emission part 50 Light emission control part 52 Buzzer 54 Power supply part 100 Insulation operation rod 110 Electric wire

Claims (3)

A main body having a hook for hooking on the distribution line;
A first CT sensor and a second CT sensor which are provided on the main body and are arranged side by side along the distribution line when the main body is hooked on the distribution line, and detect a pulsed ground fault current flowing in the distribution line; ,
A light emitting unit disposed in the main body;
When the first CT sensor detects a ground fault current first in time, and when the second CT sensor detects a ground fault current first in time, the light emitting unit emits light in different light emission modes. A light emission control unit,
A connecting portion connected to a distal end portion of an insulating operation rod on a lower surface of a storage portion storing the first CT sensor, the second CT sensor, and the light emission control portion;
A CT receiver comprising: The light emitting unit includes a first light emitting unit corresponding to the first CT sensor and a second light emitting unit corresponding to the second CT sensor,
The light emission control unit causes the first light emitting unit to emit light when the first CT sensor detects a ground fault current first in time, and the second CT sensor detects a ground fault current first in time. 2. The CT receiver according to claim 1, wherein the second light emitting unit emits light when the light is emitted. 3. The CT receiver according to claim 2, wherein the first light emitting unit and the second light emitting unit emit light in a display mode of an arrow indicating a direction in which a ground fault current flows.

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