Distribution network line fault segment positioning method based on differential offset

A line fault and positioning method technology, applied in the direction of fault location, information technology support system, etc., can solve the problems of high requirements for transformers, complicated information acquisition, ignoring the use of information before faults, etc.

Inactive Publication Date: 2015-08-26
STATE GRID CORP OF CHINA +2
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AI Technical Summary

Problems solved by technology

[0004] The current positioning methods only use the data after the fault occurs, while ignoring the use of pre-fault information
At the same time, most positioning methods only consider zero-sequence current information (three-phase information is required), which requires high transformers and complicated information acquisition, and these methods will fail when the data is missing

Method used

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  • Distribution network line fault segment positioning method based on differential offset
  • Distribution network line fault segment positioning method based on differential offset
  • Distribution network line fault segment positioning method based on differential offset

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Embodiment Construction

[0059] The fault waveform required by the present invention comes from the distributed fault section positioning system, and the system architecture is as follows figure 2 shown. The distribution network fault section location system consists of a monitoring master station, a substation (busbar) measurement device, and node fault location devices distributed throughout the distribution line. The fault location node divides the line into several sections topologically, and each node installs three sets of measuring devices to collect the three-phase current and voltage of the line synchronously in real time.

[0060]According to the fault location method invented, different types of faults are set in the 10kV distribution network simulation system. The system structure diagram is as follows image 3 As shown, ①, ②, ③ are section numbers, and faults are set on section ②. The sampling frequency is 20kHz (N = 400 data points per cycle), the fault occurrence time is 0.7s, the a...

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Abstract

The invention discloses a distribution network line fault segment positioning method based on differential offset degree. An earth fault is positioned through analyzing the phase current characteristics of a fault phase current before fault occurrence and during the period from fault occurrence to action of an arc extinguishing coil, extracting a fault characteristic quantity from the phase current characteristic and utilizing the full-course waveform differential offset degree. The distribution network line fault segment positioning method only requires measurement for the fault phase current of the line and has advantages of simple solution and high applicability. The distribution network line fault segment positioning method can well settle problems of weak fault current, low reliability and low sensitivity which commonly exist in single-phase earth fault of a small-current earth system. Furthermore an interference to the system is prevented.

Description

technical field [0001] The invention relates to a method for diagnosing a distribution network line fault, in particular to a method for locating a distribution network line fault section based on a differential offset degree. Background technique [0002] According to statistics, during the operation of the power system, power outages caused by distribution network faults account for more than 95% of the total power outages, of which 70% are caused by single-phase ground faults or busbar faults. The neutral point of domestic and foreign distribution networks widely adopts non-effective grounding (small current grounding) to avoid power supply interruption when a single-phase grounding fault occurs. For single-phase-to-ground faults in distribution networks, due to weak fault characteristics, there has been a lack of reliable fault line selection and location methods. With the improvement of people's requirements for distribution network automation level, it is more urgent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 杨军虎张朝晖刘宁李峰李晓博刘亚东
Owner STATE GRID CORP OF CHINA
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