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Line fault detection method, detection device and detection system

A line fault detection device technology, which is applied in the direction of fault location and fault detection according to conductor type, can solve the problems of low detection efficiency, cumbersome detection steps, and long detection time, so as to improve work efficiency, reduce operation risk, and reduce work volume effect

Active Publication Date: 2017-11-07
广东电网有限责任公司韶关供电局
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The detection steps of the above line fault detection method are cumbersome, the detection time is long, the detection efficiency is low, and the fault point cannot be quickly found; when the staff work on the pole, the operation risk is increased

Method used

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  • Line fault detection method, detection device and detection system
  • Line fault detection method, detection device and detection system
  • Line fault detection method, detection device and detection system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Such as figure 1 As shown, if the ground fault occurs on the right side of the line, it is only necessary to inject a detection signal I with a certain power at the detection point 2, (I=U÷Z, where U is the voltage applied to the detection point, and Z is the impedance of the wire )I is divided into two branches I 1 and I 2 , a faulty I 2 Through the earth to form a loop, there is no fault I 1 Almost zero, there is a difference in the current on both sides, that is, I 2 >I 1 , so it can be judged that the fault range is in the I of detection point 2 2 side; at detection point 2 I 2 By using the method of the present invention to select detection points for detection, the fault range can be narrowed down again, and the fault point can be found after repeated several times; if the detection is performed in groups, the detection efficiency will be further improved.

[0077] In addition, when a ground fault occurs, the ground at the fault point is not as strong as t...

Embodiment 2

[0080] Such as figure 2 As shown, the bare conductor has a short-circuit fault between phases BC, and the detection signal I is injected into the detection point 2 of phase C, and the ground terminal of signal generator 1 is lapped to the conductor of phase B. Since there is a short-circuit point between the phases, a loop is formed, and I 2 >I 1 , it can be judged that the fault range is in I 2 side. This embodiment can also use Figure 10 -A structural form, the same effect can be achieved by lapping the B-phase conductor with a horizontal grounding rod (17).

[0081] According to the above method, the fault point can be found after repeated several times. Since the short-circuit circuit is not connected in series with an inductive load, this embodiment can use a DC detection signal or an AC detection signal.

[0082]For Embodiment 1 and Embodiment 2, the detection signal is any one or any combination of AC signals, DC signals, pulse signals, and different frequency si...

Embodiment 3

[0085] Such as Figure 4 As shown, a line fault detection device includes a detection module (3) and a signal module (16) with a signal generator (1), and the side of the signal module (16) is the detection module (3). The signal generator (1) and the signal module (16) can be arranged integrally or separately.

[0086] Such as Figure 8 As shown, preferably, the signal module (16) includes a first signal module (101) and a second signal module (102), and the first signal module (101) and the second signal module (102) are located in the detection module (3 ) on both sides. The first signal module and the second signal module successively input detection signals to the detection points on the faulty power line, and the detection modules successively detect the electrical characteristics on both sides of the detection points.

[0087] Preferably, the first signal module (101) and the second signal module (102) are electrically connected with a switching module (4), and the s...

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Abstract

The invention provides a line fault detection method, which is characterized by inputting a detection signal to a detection point on a power-failed fault power line successively or simultaneously through a signal generator; detecting electrical characteristics at the two sides of the detection point; and judging fault coverage locates at which side of the detection point according to difference between the electrical characteristics at the two sides. Provided is a detection device, which comprises a detection module and a signal module having the signal generator. The signal generator enables the detection signal to be input to the detection point on the power-failed fault power line successively or simultaneously; and the detection module carries out detection on the electrical characteristics at the two sides of the detection point, and judges the fault coverage locates at which side of the detection point. Provided is a detection system. The detection system is characterized in that the detection signal is input to the detection point on the power-failed fault power line through the signal generator; the multiple detection modules on the line send the detected values to a master station; and the master station and the detection modules form an SCADA system. According to the line fault detection method, the detection device and the detection system, line fault points can be found out quickly, and maintenance work risk is reduced.

Description

technical field [0001] The present invention relates to the technical field of line detection, and more specifically, to a line fault detection method, detection device and detection system. Background technique [0002] When a power line fails, the common method is: disconnect the section switch and branch line switch of the line, and then use the insulation resistance tester to perform section detection on the line; when the section line is long or there is no switch in this section, It is necessary to untie the wire barge interface for segment detection, so as to judge the fault range. Sometimes it is even necessary to untie the wire barge interface at multiple points for detection in order to determine the fault point. When looking for high-voltage line faults, the staff also have to work on the pole to untie the jumper on the pole. [0003] The detection steps of the above line fault detection method are cumbersome, the detection time is long, the detection efficiency...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/085
Inventor 罗显泉
Owner 广东电网有限责任公司韶关供电局
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