Fault section location method of distribution network based on sudden change rate of current

A technology of current sudden change and line fault, applied in the direction of fault location, etc., can solve the problems of ignoring the use of information before the fault, complicated information acquisition, failure and so on

Active Publication Date: 2017-08-25
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Fault section location method of distribution network based on sudden change rate of current
  • Fault section location method of distribution network based on sudden change rate of current
  • Fault section location method of distribution network based on sudden change rate of current

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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 method for locating a fault section of a distribution network line based on a current mutation rate. 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, the fault is extracted from it. Characteristic quantity, and use the waveform current mutation rate of the whole process for positioning. 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 small current grounding system, and will not Introduce disturbances to the system.

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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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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