JP2010256135A - Equipment for probing accident point - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide equipment 1 for probing an accident point which enables safe and easy probing of the accident point of distribution lines W1, W2 and W3 where a ground fault or the like has occurred. <P>SOLUTION: The equipment 1 for probing the accident point includes connecting cable parts 21, 22 and 23 of which the tip portions are connected respectively to the distribution lines W1, W2 and W3, a DC power supply part 51 which is connected to the base end portions of the connecting cable parts 21, 22 and 23 and impresses DC voltage on the connecting cable parts 21, 22 and 23, CT sensor parts 31, 32 and 33 which are provided respectively near the tip portions of the connecting cable parts 21, 22 and 23 and detect a DC current flowing through the connecting cable part 21, 22 and 23, and light-emitting parts 41, 42 and 43 which are provided respectively in the CT sensor parts 31, 32 and 33 and emit light when the DC current is detected by the CT sensor parts 31, 32 and 33. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an accident point search device for searching a place where an accident such as a ground fault has occurred.

  When a ground fault occurs in a distribution line, it is required to promptly repair the location of the accident (hereinafter referred to as “accident point”) and restore the power supply in the distribution line. For that purpose, it is necessary to quickly identify the accident point and to repair the accident point by blocking the accident occurrence section including the accident point as necessary.

  However, it is difficult to identify the accident point by, for example, measuring the insulation resistance or visually checking the operator. In particular, it is difficult to find a short circuit inside a switch provided on a pillar. Therefore, conventionally, an accident point search device has been used in order to quickly identify an accident point (see, for example, Patent Document 1).

  The fault point search device applies a DC voltage to the distribution line in the accident occurrence section, and searches for the presence or absence of a DC current flowing through the distribution line by applying the DC voltage. In other words, a ground fault current (DC current) flows between the application point of the DC voltage by the DC power supply unit in the distribution line and the accident point, but no ground fault current flows at other points on the distribution line. Therefore, the worker specifies the accident point based on whether or not the ground fault current is detected.

JP-A-2-17468

  By the way, when applying an accident point survey device to a distribution line, since it is dangerous if an arc or the like occurs, the operator usually moves to a safe place away from the distribution line and applies a DC voltage. Do. Therefore, it may be difficult to distinguish a distribution line to which a DC voltage is applied, a distribution line to which a DC current has flowed by application of a DC voltage, or the like. In particular, in the case of a three-phase three-wire distribution line, if a DC voltage is applied simultaneously to the three lines, it may be difficult to specify which distribution line the DC current is flowing through.

  An object of the present invention is to provide an accident point search device that can safely and easily specify an accident point of a distribution line in which a ground fault or the like has occurred.

  The present invention includes a connection cable portion having a distal end connected to a distribution line, a direct current power supply portion connected to a proximal end portion of the connection cable portion, and capable of applying a direct current voltage to the connection cable portion, and the connection cable portion. A CT sensor unit that is provided in the vicinity of the distal end portion and detects a direct current flowing through the connection cable unit, and a light emitting unit that is provided in the CT sensor unit and emits light when the direct current is detected by the CT sensor unit And an accident point search apparatus characterized by comprising:

  Moreover, it is preferable that a plurality of the connection cable portions are provided.

  Moreover, it is preferable that this invention is further provided with the alerting | reporting part which alert | reports the said connection cable part which applied the said DC voltage.

  Moreover, it is preferable that the said alerting | reporting part is comprised with a light-emitting body.

  Moreover, it is preferable that the said connection cable part is provided with a clamp part in the said front-end | tip part.

  ADVANTAGE OF THE INVENTION According to this invention, the accident point search device which can identify the accident point of the distribution line which a ground fault etc. generate | occur | produced safely and easily can be provided.

It is the schematic which shows schematic structure of the accident point search apparatus which concerns on embodiment of this invention. It is a circuit diagram of the electric power distribution apparatus of the accident point search apparatus which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram illustrating a schematic configuration of an accident point search apparatus 1 according to the present embodiment.
As shown in FIG. 1, the accident point search device 1 according to the present embodiment includes three-phase three-wire distribution lines W1, W2, and W3 having a red-phase distribution line W1, a white-phase distribution line W2, and a black-phase distribution line W3. When a tie fault occurs, a DC pulse voltage is applied to the red phase distribution line W1, the white phase distribution line W2, and the black phase distribution line W3 in the accident section separated from the sound section, and the red phase distribution line W1, the white phase distribution line W2, and the black phase distribution line W3. The presence or absence of a ground fault current as a direct current flowing through the An operator specifies an accident point by the presence or absence of the ground fault current which flows into the red phase distribution line W1, the white phase distribution line W2, and the black phase distribution line W3 searched by the accident point search apparatus 1.

  The accident point search device 1 according to the present embodiment includes a connection cable portion 2 having a bifurcated tip portion and a plurality of CT sensor portions 31 and 32 provided in the vicinity of the branched tip portion of the connection cable portion 2. , 33, a plurality of light emitting units 41, 42, 43 provided in the plurality of CT sensor units 31, 32, 33, the power distribution device 5, and a direct current detection unit 8 for detecting a direct current flowing through the distribution line. And comprising.

  The front end portion of the connection cable portion 2 is connected to the first connection cable portion 21 connected to the red phase distribution line W1, the second connection cable portion 22 connected to the white phase distribution line W2, and the first connection cable portion 22 connected to the black phase distribution line W3. 3 connection cable portions 23.

  In addition, since the 1st connection cable part 21, the 2nd connection cable part 22, and the 3rd connection cable part 23 are the same structures, the 2nd connection cable part 22 is demonstrated by demonstrating the structure of the 1st connection cable part 21. FIG. No. 22 is attached to the constituent elements and No. 23 series is attached to the constituent elements of the third connection cable portion 23, and the description of the second connection cable portion 22 and the third connection cable portion 23 is omitted.

  The 1st connection cable part 21 is provided with the cable part 21a and the clamp part 21b provided in the front-end | tip of the cable part 21a. The clamp part 21b is composed of a pair of clamp members that are rotatably connected by a hinge. The clamp part 21b is configured to be able to grip the red phase distribution line W1 by rotating a pair of clamp members so as to sandwich a conductor part (not shown) such as a core wire of the red phase distribution line W1.

The plurality of CT sensor units 31, 32, 33 are a first CT sensor unit 31 provided in the vicinity of the distal end portion of the first connection cable portion 21 and a second CT sensor unit 32 provided in the vicinity of the distal end portion of the second connection cable portion 22. And a third CT sensor portion 33 provided in the vicinity of the distal end portion of the third connection cable portion 23.
The first CT sensor unit 31 detects a direct current flowing through the first connection cable unit 21. Similarly, the second CT sensor unit 32 detects a direct current flowing through the second connection cable unit 22, and the third CT sensor unit 33 detects a direct current flowing through the third connection cable unit 23.

  The plurality of light emitting units 41, 42, and 43 are provided in the first light emitting unit 41 provided in the first CT sensor unit 31, the second light emitting unit 42 provided in the second CT sensor unit 32, and the third CT sensor unit 33. 3 light emitting units 43.

  The first light emitting unit 41 emits light when the first CT sensor unit 31 detects a direct current flowing through the first connection cable unit 21. Similarly, the second light emitting unit 42 emits light when the second CT sensor unit 32 detects a direct current flowing through the second connection cable unit 22, and the third light emitting unit 43 is connected to the third CT sensor unit 33 by the third connection. Light is emitted when a direct current flowing through the cable portion 23 is detected. In addition, LED is used for the light-emitting body in a light emission part.

  The power-applying device 5 is connected to the power supply unit 9 and generates a high-voltage (for example, 5 kV) DC pulse voltage. In addition, a base end portion of the connection cable portion 2 is connected to the power application device 5, and a first connection cable portion 21, a second connection cable portion 22, and a third connection cable, which are distal ends of the connection cable portion 2. A high voltage (for example, 5 kV) direct-current pulse voltage generated at each of the units 23 is simultaneously applied.

Here, FIG. 2 shows a circuit diagram of the power distribution device 5 of the accident point search device 1 according to the present embodiment.
As shown in FIG. 2, the power applicator 5 includes a casing 50, a DC high voltage generation circuit 51 as a DC power supply unit, a meter display unit 52, a DC / AC converter 59, a switch unit 6, and a notification unit. 7.

  The housing 50 constitutes the external appearance of the power application device 5 and is formed of an insulator. Further, the housing 50 is provided with a ground terminal portion 53 and an input terminal portion 54. An earth cord 53 a is connected to the earth terminal portion 53, and the earth cord 53 a is grounded to the ground G. An external power supply unit 9 is connected to the input terminal unit 54.

The DC high voltage generating circuit 51 has one side connected to the ground terminal portion 53 and the other side connected to a high voltage output terminal portion 55 provided inside the housing 50, and generates a high DC pulse voltage.
Further, a limiting resistor 56 is connected in series with the DC high voltage generating circuit 51 between the ground terminal portion 53 and the high voltage output terminal portion 55.

  The meter display unit 52 is connected in parallel with the DC high voltage generation circuit 51 between the ground terminal unit 53 and the high voltage output terminal unit 55. The meter display unit 52 displays the output amount of the high voltage DC pulse voltage generated by the DC high voltage generation circuit 51.

Further, a discharge resistor 58 is connected between the ground terminal portion 53 and the high-voltage output terminal portion 55 through a switch 57 in parallel with the DC high-voltage generation circuit 51. The discharge resistor 58 constitutes a safety device of the power application device 5.
For example, if the ground capacitance between the three-phase three-wire distribution lines W1, W2, W3 and the ground G is large, the three-phase three-wire distribution line W1 even if the output of the power application device 5 is reduced after work. , W2 and W3 are charged with a high voltage for a long time, and if an operator accidentally touches the three-phase three-wire distribution lines W1, W2 and W3, an electric shock may occur. For this reason, when the power supply device 5 is turned off, the switch 57 is automatically turned on, and the high-voltage output terminal portion 55 and the ground terminal portion 53 are grounded via the discharge resistor 58. The electric charge stored in the ground capacitance of the electric wires W1, W2, W3 is discharged, and the charging voltage of the three-phase three-wire distribution wires W1, W2, W3 can be forcibly lowered.

  The DC / AC converter 59 is connected between the DC high voltage generation circuit 51 and the input terminal portion 54. The DC / AC converter 59 boosts the DC 12V of the in-vehicle battery, for example, when an in-vehicle battery as a power source is used.

The switch unit 6 is provided between the high voltage output terminal unit 55 and the base end of the connection cable unit 2.
The switch unit 61 applies a DC pulse voltage to the connection cable unit 2 by pressing (selection) by the operator. By applying a DC pulse voltage to the connection cable part 2, the red phase distribution line W <b> 1 connected to the first connection cable part 21, the white phase distribution line W <b> 2 connected to the second connection cable part 22, and the third connection cable part 23. A DC pulse voltage is applied to the connected black phase distribution line W3.

  The alerting | reporting part 7 is comprised by LED as a light-emitting body. In addition, the notification unit 7 is configured such that a predetermined current flows when an operator presses the switch unit 6, whereby the LED emits light.

As shown in FIG. 1, the DC current detection unit 8 includes an insulating operation rod 80 formed in a rod shape, and a detection unit 81 connected to the tip of the insulation operation rod 80.
The insulating operation rod 80 is formed of an insulator such as fiber reinforced plastic. For example, an operator who has boarded an aerial work vehicle grips the base end portion of the insulating operation rod 80 and detects the distal end detection portion 81. Is used to lock the red phase distribution line W1, the white phase distribution line W2 and the black phase distribution line W3 at high places.

  The insulating operation rod 80 may be a joint type in which a plurality of insulating cylinders having different diameters are connected so as to be expandable and contractable in the axial direction. It is possible to position the detection unit 81 to a position far from the three-phase three-wire distribution line with a small movement amount in a work vehicle or the like.

The detection unit 81 includes a main body unit 82, a locking unit 83 that locks the red phase distribution line W1, the white phase distribution line W2, and the black phase distribution line W3, a red phase distribution line W1 that locks the locking unit 83, and white A current detector (not shown) for detecting a direct current flowing through the phase distribution line W2 or the black phase distribution line W3.
The main body portion 82 is formed in a substantially rectangular parallelepiped shape, and the distal end portion of the insulating operation rod 80 is connected to the lower portion of the main body portion 82. The main body 82 has a drip-proof structure because the detection unit 81 is used outdoors.

The locking portion 83 is formed at a position (in the vicinity) adjacent to the connecting portion of the insulating operation rod 80 in the lower portion of the main body portion 82. The locking portion 83 is formed so as to be cut out in a state of penetrating in the thickness direction upward of the main body portion 82.
The locking part 83 is for inserting the distribution line from the lower side of the main body part 82 and for locking the main body part 82 to the red phase distribution line W1, the white phase distribution line W2, and the black phase distribution line W3 so as to be hooked on the distribution line. Provided.
The current detection unit is built in the main body unit 82 and detects a ground fault current flowing through the red phase distribution line W1, the white phase distribution line W2, and the black phase distribution line W3.

  The detection unit 81 includes a level detection circuit that determines the output of the ground fault current detected by the current detector, and a plurality of lights that emit light of a predetermined color according to the output level of the ground fault current determined by the level detection circuit. It is good also as a structure which provides this light-emitting body. By configuring the light emitter to emit a predetermined color according to the output level of the ground fault current of the level detection circuit, in addition to the presence or absence of the ground fault current, for example, the output level of the ground fault current can be easily visually determined from below. It becomes possible to confirm.

Next, the usage method of the accident point search apparatus 1 which concerns on this embodiment is demonstrated.
First, the worker grounds the ground cord 53 a provided in the power-applying device 5 to the ground G.
Next, the worker connects the first connection cable portion 21 to the red phase distribution line W1. Specifically, the operator holds the clamp part 21b provided at the tip of the first connection cable part 21 by the connecting conductor part (not shown) provided in the red-phase distribution line W1, 1 The connection cable part 21 is connected to the red phase distribution line W1.

  When the first connection cable part 21 is connected to the red phase distribution line W1, the operator then connects the second connection cable part 22 to the white phase distribution line W2, and similarly the third connection cable part 23 to the black phase distribution line W3. Connect.

  When the first connection cable part 21 is connected to the red phase distribution line W1, the second connection cable part 22 is connected to the white phase distribution line W2, and the third connection cable part 23 is connected to the black phase distribution line W3, the operator Next, the power application device 5 is connected to the power supply unit 9. For example, when using a vehicle-mounted battery as the power supply unit 9, it is connected to the vehicle-mounted battery.

When the power application device 5 is connected to the power supply unit 9, the operator presses the switch unit 6 and applies a DC pulse voltage to the connection cable unit 2.
When the operator presses the switch unit 6, the notification unit 7 provided in the power application device 5 emits light to notify that the DC pulse voltage has been applied to the connection cable unit 2. Similarly, the output amount of the DC pulse voltage output to the meter display unit 52 is displayed.

Here, in the accident section cut off from the healthy section, when a ground fault has occurred at the point A of the red-phase distribution line W1 shown in FIG. 1, the ground G passes through the point A from the connection point of the clamp portion 21b. A ground fault current flows in When a ground fault current flows through the first connection cable unit 21, the first CT sensor unit 31 detects that a current has flowed through the first connection cable unit 21, and a first light emitting unit provided in the first CT sensor unit 31. 41 emits light.
Thereby, it can be seen that a direct current flows through the first connection cable portion 21. That is, it can be seen that the red phase distribution line W1 is grounded.

Next, the operator locks the DC current detection unit 8 at an arbitrary position of the red phase distribution line W1 so that the red phase distribution line W1 is hooked on the locking part 33 of the DC current detection unit 8, and the red phase distribution line W1. Check the ground fault.
In this way, the worker can specify the accident point in the red phase distribution line W1.

  According to the accident point search device 1 according to the present embodiment having the above-described configuration, the following effects can be obtained.

  The accident point search device 1 according to the present embodiment includes a first CT sensor unit 31 and a second CT sensor unit 32 that detect a direct current flowing through the first connection cable unit 21, the second connection cable unit 22, and the third connection cable unit 23. And the third CT sensor unit 33, the first CT sensor unit 31, the second CT sensor unit 32, and the third CT sensor unit 33 emit light when detecting a direct current, the first light emitting unit 41, the second light emitting unit 42, and the third light emitting unit. Part 43. For this reason, even when a DC voltage is applied to the connection cable portion 2 at a remote location, it is possible to easily determine in which connection cable portion at the tip the DC current due to the ground fault flows. That is, it is possible to easily determine which distribution line is grounded. As a result, it is possible to perform the accident point exploration work safely and easily.

  Moreover, the accident point search device 1 according to the present embodiment includes a notification unit 7 that notifies the connection cable unit 2 that a DC voltage has been applied by light emission of the light emitter. Therefore, the operator can easily recognize that a DC voltage is applied to the connection cable portion 2. As a result, it becomes possible to perform the accident point exploration work safely.

  Moreover, what is called a cable clamp which has a clamp part in the front-end | tip is used as the front-end | tip part of a trifurcated connection cable part in the accident point investigation apparatus 1 which concerns on this embodiment. Therefore, for example, it becomes possible to attach the clamp part to the distribution line by operating the insulating jacket. Thereby, the attachment work of a connection cable part becomes easy, and the search work of an accident point becomes easy.

In addition, this invention is not limited to the said embodiment at all, and the technical scope of this invention is not limited to these.
For example, in the present embodiment, the connection cable portion 2 having the tip portion branched in three is described, but the present invention is not limited to this. The tip of the connection cable portion 2 can be changed according to the number of distribution lines to be connected.

  Moreover, in this embodiment, although demonstrated using LED as the several light emission part 41,42,43 provided in the some CT sensor part 31,32,33, in this invention, it is not limited to this. The plurality of light emitting units 41, 42, 43 may be configured by a light emitter other than the LED, and may be anything that can emit light.

  Moreover, in this embodiment, although demonstrated using LED as a light-emitting body which comprises the alerting | reporting part 7, in this invention, it is not limited to this. The alerting | reporting part 7 may be comprised by light-emitting bodies other than LED.

  In addition, the notification unit 7 may have a configuration in which, for example, a sound is output to perform notification in addition to a configuration in which the light emitter is caused to emit light to perform notification. In that case, it is preferable to use different audio for each connection cable portion.

  In the present embodiment, the clamp portions 21b, 22b, and 23b provided at the tips of the first connection cable portion 21, the second connection cable portion 22, and the third connection cable portion 23, and the CT provided in the vicinity of the tip portion, respectively. The sensor units 31, 32, and 33 are individually provided. However, the clamp units 21b, 22b, and 23b and the CT sensor units 31, 32, and 33 are integrally configured like a clamp-type CT sensor. May be used.

DESCRIPTION OF SYMBOLS 1 Accident point search device 2 Connection cable part 5 Power supply apparatus 6 Switch part 7 Notification part 8 DC current detection part 9 Power supply part 21 1st connection cable part 21b 1st clamp part 22 2nd connection cable part 22b 2nd clamp part 23 3rd connection cable part 23b 3rd clamp part 51 DC high voltage generation circuit (DC power supply part)
W1 Red phase distribution line W2 White phase distribution line W3 Black phase distribution line

Claims (5)

A connecting cable portion whose tip is connected to the distribution line; and
A direct-current power supply unit connected to a base end of the connection cable unit and capable of applying a direct-current voltage to the connection cable unit;
A CT sensor unit that is provided in the vicinity of the tip of the connection cable unit and detects a direct current flowing through the connection cable unit;
A light emitting unit that is provided in the CT sensor unit and emits light when the CT sensor unit detects the direct current;
An accident point search device characterized by comprising:   The accident point search device according to claim 1, wherein a plurality of the connection cable portions are provided.   The accident point search device according to claim 1, further comprising a notification unit that notifies the connection cable unit to which the DC voltage is applied.   The accident point exploration device according to claim 3, wherein the notification unit includes a light emitter.   The accident point search device according to any one of claims 1 to 4, wherein the connection cable portion includes a clamp portion at the distal end portion.

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