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Distribution network line fault section positioning method based on current break rate

A technology for sudden changes in current and line faults, applied in directions such as fault locations, which can solve problems such as high requirements for transformers, complex information acquisition, and ignoring the use of pre-fault information.

Active Publication Date: 2015-07-22
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0004] It can be seen that the current methods only use the data after the fault occurs, while ignoring the use of the information before the fault.
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 section positioning method based on current break rate
  • Distribution network line fault section positioning method based on current break rate
  • Distribution network line fault section positioning method based on current break rate

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Embodiment Construction

[0069] 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.

[0070] 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 distribution network line fault section positioning method based on current break rate. The distribution network line fault section positioning method includes analyzing phase current characteristics of fault phase current before faults and before an arc suppression coil acts for ground faults, extracting fault characteristics from the phase current characteristics, and positioning by adopting full-process waveform current break rate. The distribution network line fault section positioning method only needs to measure phase current of line faults, is simple and high in applicability, and the problems of fault current weakness, poor reliability and sensitivity when a small-current grounding system has single-phase grounding faults commonly can be well solved. Meanwhile, interference cannot be introduced.

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 current mutation rate. 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 to fu...

Claims

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Application Information

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IPC IPC(8): G01R31/08
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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