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A line fault detection method, detection device and detection system

A line fault detection method technology, applied in the direction of fault location, fault detection according to conductor type, etc., can solve the problems of not being able to quickly find fault points, cumbersome detection steps, and increased operation risks, so as to reduce workload and labor intensity, reduce Work risk and workload reduction effects

Active Publication Date: 2022-05-10
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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  • A line fault detection method, detection device and detection system
  • A line fault detection method, detection device and detection system
  • A 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, a ground fault occurs on the right side of the line in the figure, and 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 again, 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 i...

Embodiment 2

[0080] Such as figure 2 As shown, the bare conductor has a short-circuit fault between phases BC, the detection signal I is injected into the detection point 2 of phase C, and the ground terminal of the 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

A line fault detection method: input detection signals to detection points on the faulty power line that have been powered off successively or simultaneously through a signal generator, detect the electrical characteristics on both sides of the detection point, and judge that the fault range is within the One side of the detection point. A detection device: including a detection module and a signal module with a signal generator, the signal generator inputs the detection signals successively or simultaneously to the detection point of the faulty power line that has been powered off, and the detection module detects the electrical characteristics on both sides of the detection point, Judging that the fault range is on a certain side of the detection point; a detection system, the detection system inputs a detection signal to the faulty power line that has been powered off through a signal generator, and sends the detected value to the main power line by multiple detection modules on the line Station, master station and various detection modules form a SCADA system. By using the method, device and system of the present invention, the fault point of the circuit can be quickly found, and the risk of maintenance operation 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 Patents(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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