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Distribution line grounding fault positioning method and positioning device

A technology for power distribution lines and grounding faults, applied in fault locations, measuring devices, and fault detection by conductor type, etc., can solve the problems of long power outage, long time consumption, and high line failure rate, and achieve fast fault location and reduced testing. range effect

Active Publication Date: 2020-09-04
昆明品启科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The distribution line has many branches, the network structure is complex, and the line failure rate is high
Among them, the single-phase ground fault is one of the more common faults. When a single-phase ground fault occurs in the system, the non-fault phase-to-ground voltage rises, which is easy to cause various overvoltages, resulting in intermittent arcs, endangering the system insulation, and in severe cases, it will develop into Two-phase short circuit fault
Because there are many reasons for single-phase ground fault, and the line is long, it is difficult to judge the fault location
At present, most of them use the method of manual line inspection to find faults. It takes a lot of time to complete the inspection of the entire line, resulting in a long power outage, especially in remote areas where the traffic is inconvenient. It takes several walks to inspect a very short line. Hours of road, resulting in a lot of waste of manpower and material resources

Method used

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  • Distribution line grounding fault positioning method and positioning device
  • Distribution line grounding fault positioning method and positioning device
  • Distribution line grounding fault positioning method and positioning device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] figure 1 The flow chart of the distribution line ground fault location method provided by Embodiment 1 of the present invention, as shown in figure 1 As shown, the distribution line ground fault location method provided in this embodiment includes the following steps:

[0054] Step 101: Isolate the user-side transformer from the power distribution line;

[0055] Step 102: Inject a DC high-voltage signal into the distribution line, and determine the faulty phase according to the current value of each phase;

[0056] Step 103: Determine the grounding resistance of the fault phase according to the fault phase current and the injected high-voltage direct current signal;

[0057] Step 104: Inject an AC high-voltage signal into the distribution line, and calculate the prediction of the distance between the fault point and the AC high-voltage signal injection point according to the voltage, current, capacitive current of the injected high-voltage AC signal, and the grounding...

Embodiment 2

[0077] figure 2 The flow chart of the distribution line ground fault location method provided by Embodiment 2 of the present invention, as shown in figure 2 As shown, the distribution line ground fault location method provided in this embodiment includes the following steps:

[0078] Step 201: Isolate the user-side transformer from the power distribution line;

[0079] Step 202: Inject a DC high-voltage signal into the distribution line, and determine the faulty phase according to the current value of each phase;

[0080] Step 203: Taking the signal injection point of the power distribution line as the starting point of the line, perform the dichotomy step, the dichotomy step includes: measuring the current value of the faulty phase at the middle point of the line, and judging the current value at the measurement point Whether it is zero, if the current value at the measurement point is zero, it means that the fault point is located at the front-end line of the measurement...

Embodiment 3

[0090] image 3 The flow chart of the distribution line ground fault location method provided by Embodiment 3 of the present invention, as shown in image 3 As shown, the distribution line ground fault location method provided in this embodiment includes the following steps:

[0091] Step 301: Isolate the user-side transformer from the power distribution line;

[0092] Step 302: Injecting a high-voltage AC signal into an intermediate point of the distribution line;

[0093] Step 303: Measure the current value on both sides of the injection point;

[0094] Step 304: judging whether the difference between the current values ​​on both sides is smaller than a set value, which is set by those skilled in the art according to the actual situation;

[0095] Step 305: If yes, the line is faultless;

[0096] Step 306: If not, it means that the fault is located on the side with the larger current value, check whether there is a fault on the side with the larger current value within t...

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Abstract

The invention discloses a distribution line grounding fault positioning method and a positioning device. The distribution line grounding fault positioning method mainly comprises: an AC / DC signal rapid positioning method suitable for no branch or few branches, an AC / DC signal comprehensive positioning method, an AC signal fault positioning method and a pulse signal fault positioning method. The distribution line ground fault positioning device comprises a host and a current inspection instrument, the host and the current inspection instrument are respectively provided with a wireless transmission unit, and the current inspection instrument can control the host through the wireless transmission units to realize remote operation of the host. The distribution line grounding fault positioningmethod and the positioning device provided by the invention have the advantage of high fault positioning efficiency.

Description

technical field [0001] The invention relates to the technical field of line detection in electric power distribution systems, in particular to a method and device for locating a ground fault of a power distribution line. Background technique [0002] The distribution line has many branches, the network structure is complex, and the line failure rate is high. Among them, the single-phase ground fault is one of the more common faults. When a single-phase ground fault occurs in the system, the non-fault phase-to-ground voltage rises, which is easy to cause various overvoltages, resulting in intermittent arcs, endangering the system insulation, and in severe cases, it will develop into Two-phase short circuit fault. Since there are many reasons for the single-phase ground fault, and the line is long, it is difficult to judge the fault location. At present, most of them use the method of manual line inspection to find faults. It takes a lot of time to complete the inspection of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/11G01R31/08G01R31/52G01R31/58
CPCG01R31/11G01R31/085G01R31/52G01R31/58Y04S10/52
Inventor 刘雪扬刘子超张文斌
Owner 昆明品启科技有限公司
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