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Fault section location method of distribution network based on standardized offset degree

A line fault and section location technology, applied in the fault location and other directions, can solve problems such as failure, high requirements for transformers, and complex information acquisition, achieving the effect of strong applicability, solving weak fault currents, and simple data acquisition

Active Publication Date: 2017-09-12
SHANGHAI JIAOTONG UNIV
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  • Summary
  • 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 of distribution network based on standardized offset degree
  • Fault section location method of distribution network based on standardized offset degree
  • Fault section location method of distribution network based on standardized offset degree

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Embodiment Construction

[0056] 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.

[0057] 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 for locating a distribution network line fault section based on a standardized offset degree. For a ground fault, by analyzing the phase current characteristics of the fault phase current before the fault occurs and before the fault occurs to the action of the arc suppressing coil, extract Fault feature quantity, and use the whole process waveform standardization offset to locate. The invention only needs to measure the fault phase current of the line, has a simple scheme and strong applicability, and can well solve the problems of weak fault current, poor reliability and low sensitivity in the case of a single-phase ground fault in the current low-current grounding system, and will not Introduce disturbances to 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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Patent Type & Authority Patents(China)
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 JIAOTONG UNIV
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