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Fault section location method for distribution network based on wide-area differential offset

A line fault and section positioning technology, applied in the direction of fault location, information technology support system, etc., can solve problems such as failure, complex information acquisition, and high requirements for transformers, and achieve weak fault current, simple data acquisition, and strong applicability Effect

Active Publication Date: 2017-09-12
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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  • Fault section location method for distribution network based on wide-area differential offset
  • Fault section location method for distribution network based on wide-area differential offset
  • Fault section location method for distribution network based on wide-area differential offset

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Embodiment Construction

[0055] 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.

[0056] 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 ...

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Abstract

The invention discloses a method of for positioning fault sections of distribution network lines on basis of wide-area differential deviation. According to the method, for a ground fault, phase current characteristics of fault phase current before the occurrence of the fault and during a period of from the occurrence of the fault to acting time of an arc suppression coil are analyzed so as to extract fault characteristic quantities, and positioning is performed by means of waveform wide-area differential deviation during the whole course. only the fault phase current of a line needs to be measured, the scheme is simple, adaptability is high, the problems that the existing general low-current ground system has weak fault current, poor reliability and low sensitivity in case of ground fault is well solved, and no interference is caused to a system.

Description

technical field [0001] The invention relates to a method for diagnosing faults of distribution network lines, in particular to a method for locating fault sections of distribution network lines based on wide-area differential offset. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 刘亚东刘嘉美谢潇磊胡琛临盛戈皞江秀臣
Owner SHANGHAI JIAO TONG UNIV
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