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Distribution network line fault section locating method based on standardization drift rate

A technology of line fault and locating method, applied in the fault location and other directions, can solve the problems of neglecting the use of pre-fault information, complex information acquisition, and high requirements for transformers

Active Publication Date: 2015-07-08
SHANGHAI JIAO TONG UNIV
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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 section locating method based on standardization drift rate
  • Distribution network line fault section locating method based on standardization drift rate
  • Distribution network line fault section locating method based on standardization drift rate

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Embodiment Construction

[0060] The fault waveform required by the present invention comes from the distributed fault section positioning system, and the system architecture is as follows figure 2shown. 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.

[0061] 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 section locating method based on a standardization drift rate. The fault feature quantity is extracted from a ground fault by analyzing the phase current features of fault phase current before a fault occurs and during the time period between fault occurring and the action of an arc suppression coil, and the full-process waveform standardization drift rate is adopted for locating. Only the fault phase current of a line needs to be measured, the scheme is simple, high adaptability is achieved, the current ubiquitous problems that when a small current grounding system has a single-phase earth fault, the fault current is weak, reliability is poor, and sensitivity is low can be solved well, and meanwhile no interference is introduced into the 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 standardized offset degrees. 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 ur...

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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