A method and device for locating a ground fault in a distribution line

A technology for power distribution lines and grounding faults, which is applied to fault locations, measuring devices, and fault detection according to conductor types. , Fast fault location effect

Active Publication Date: 2022-06-24
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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  • A method and device for locating a ground fault in a distribution line
  • A method and device for locating a ground fault in a distribution line
  • A method and device for locating a ground fault in a distribution line

Examples

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Effect test

Embodiment 1

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

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

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

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

[0057] Step 104: Inject an AC high voltage signal into the power distribution line, and calculate the prediction of the distance from the fault point to the injection point of the AC high voltage signal according to the injected voltage, current, and capacitor current of the high volt...

Embodiment 2

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

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

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

[0080] Step 203: Take the signal injection point of the distribution line as the starting point of the line, and perform a 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 Is it zero? If the current value at the measurement point is zero, it means that the fault point is located in the front-end line of...

Embodiment 3

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

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

[0092] Step 302: inject a high-voltage AC signal into the middle point of the power distribution line;

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

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

[0095] Step 305: If yes, the line is not faulty;

[0096] Step 306: If no, 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 ...

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Abstract

The invention discloses a ground fault location method and a location device of a power distribution line. The distribution line ground fault location method mainly includes: a fast location method for AC and DC signals suitable for no or few branches, a comprehensive location method for AC and DC signals, a fault location method for AC signals, and a fault location method for pulse signals. The distribution line grounding fault location device includes a host and a current patrol device, wherein the host and the current patrol device are both provided with a wireless transmission unit, and the current patrol device can control the host through the wireless transmission unit to realize remote operation of the host. The distribution line ground fault location method and location device provided by the invention have the advantage of high fault location efficiency.

Description

technical field [0001] The invention relates to the technical field of power distribution system line detection, in particular to a method and device for locating a ground fault of a 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 the single-phase grounding occurs in the system, the non-fault relative ground voltage rises, which is easy to cause various overvoltages, resulting in intermittent arcs, which endanger the system insulation. In severe cases, it will develop into Two-phase short circuit fault. Because there are many reasons for single-phase grounding faults, and the line is long, it is difficult to determine the fault location. At present, most of them use manual line inspection to find faults. It takes a lot of time to inspect the entire line, resulting in long power outage...

Claims

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Application Information

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Patent Type & Authority Patents(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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