Small current system grounding fault positioning method

A ground fault and positioning method technology, which is applied in the direction of measuring current/voltage, measuring electricity, and measuring electrical variables, etc., can solve the problems of low positioning reliability and large data upload volume, achieve high reliability, reduce communication pressure, Improve reliable results

Active Publication Date: 2018-01-26
STATE GRID HUNAN ELECTRIC POWER +3
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Problems solved by technology

[0005] In view of the defects of low positioning reliability and large amount of data uploaded in the existing small current fault location method, it is necessary to provide a small current system ground fault location method, which reduces the amount of data uploaded and the communication pressure of the data channel and improve positioning reliability

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  • Small current system grounding fault positioning method
  • Small current system grounding fault positioning method
  • Small current system grounding fault positioning method

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Embodiment Construction

[0051] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0052] see figure 1 , a kind of small current system grounding fault localization method provided by the present invention, comprises the steps:

[0053] Step 1: Extract the zero-sequence current of each feeder terminal on the fault feeder before and after the fault moment;

[0054] Among them, the zero-sequence voltage of the bus is collected in real time. When the zero-sequence voltage of the bus is detected to exceed the fault discrimination threshold, the fault location algorithm is started. First, the fault feeder is determined according to the fault line selection method, and each of the M feeder terminals on the fault feeder is extracted. The zero-sequence current i of a feeder terminal in P power frequency cycles before the fault time and Q power frequency cycles after the fault time 0ab (n);

[0055] Among them, i 0ab (n) is expres...

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Abstract

The invention discloses a small current system grounding fault positioning method. The method includes the following steps: extracting the zero sequence currents prior to and after the moment of a fault of each feeder terminal on a faulty feeder; moving a data window point by point and calculating the feature value of zero sequence current of respective feeder terminal under each data window; establishing a feature value curve for each feeder terminal; acquiring the sampling point corresponding to the maximum feature value of each feature value curve of the feeder terminal which is closest tothe bus on the faulty feeder; acquiring the feature values that correspond to the same sampling points that are acquired from the feature value curves of the rest of the feeder terminals; calculatingthe Euclidean distance of the feature values of the adjacent two feeder terminals; ranking the Euclidean distances from long to short and selecting N biggest Euclidean distances; if one Euclidean distance is greater than the sum of the rest of the N-1 Euclidean distances, taking the interval between two feeder terminals that correspond to the Euclidean distance as a fault interval. According to the invention, the method herein can increase reliability of fault positioning and reduce communication pressure of data channels.

Description

technical field [0001] The invention relates to the technical field of distribution network fault detection, in particular to a method for locating ground faults in small current systems. Background technique [0002] In our country, the distribution network area is widely distributed, the failure rate is high, and the protection configuration is relatively low. The medium-voltage distribution network is dominated by overhead lines, and the proportion of single-phase ground faults is large. Since the distribution network generally adopts the low-current grounding method, no short-circuit loop is formed when a single-phase ground fault occurs, and only a small fault is generated by the zero-sequence capacitance of the feeder. fault current, so that the system can still continue to run with faults for 1 to 2 hours. In order to avoid further expansion of the single-phase ground fault, it is necessary to find the ground fault point as soon as possible and eliminate the fault. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R19/165
Inventor 冷华刘鹏辉黄纯朱吉然张志丹唐海国龚汉阳刘海峰敖非李红青李秩期
Owner STATE GRID HUNAN ELECTRIC POWER
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