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Route selection method for single-phase ground fault of two-phase TA power distribution network

A single-phase ground fault and fault line selection technology, which is applied to electrical components, emergency protection circuit devices, etc., can solve problems affecting applications, high hardware requirements, large investment, etc., and achieve high success rate, high accuracy and reliability Effect

Active Publication Date: 2008-04-02
南通恒力包装科技股份有限公司
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Problems solved by technology

However, the use of traveling waves requires high hardware requirements and large investment, which affects its application in actual power grids

Method used

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  • Route selection method for single-phase ground fault of two-phase TA power distribution network
  • Route selection method for single-phase ground fault of two-phase TA power distribution network
  • Route selection method for single-phase ground fault of two-phase TA power distribution network

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Embodiment Construction

[0026] The invention divides the single-phase grounding fault line selection problem of the two-phase TA distribution network into two parts and solves it. When phase A or phase C is grounded, because the transient current data of the fault phase can be obtained from one of the installed A and C two-phase TAs, it is considered to use the A and C two-phase currents to construct the B-phase current first, Then synthesize a more accurate zero-sequence current that can be used for line selection, and realize line selection according to the transient characteristics of the zero-sequence current. When phase B is grounded, since the phase is not equipped with TA, the transient current of the faulty phase B cannot be obtained, and the zero-sequence current that reflects the transient characteristics of the fault cannot be constructed. Therefore, a separate line selection method needs to be studied. Considering that after phase B is grounded, the difference between the two-phase curren...

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Abstract

The invention relates to the relay protection field of a distribution network, in particular to a single-phase earth fault selection method of a double-phase TA distribution network. When B phase earth is provided to the double-phase TA distribution network, small wave packet reconstruction algorithm is utilized to analyze the sum of A phase mutant current and C phase mutant current before selection; thereby, transient state characteristics of the A phase mutant current and the C phase mutant current of various lines are fully utilized; the selection success rate is high; the accuracy and reliability are very high; earth fault lines can be selected accurately.

Description

technical field [0001] The invention relates to the field of relay protection for distribution networks, in particular to a method for line selection for single-phase grounding faults in two-phase TA distribution networks. Background technique [0002] In my country's distribution network with a voltage level of 66KV and below, most of them only install A and C two-phase current transformers, and the neutral point is not grounded or the neutral point is grounded through the arc suppression coil. About 80% of grid faults are single-phase ground faults, and the current line selection method [1-6] , except for the injected signal tracking method [2] Both are implemented using zero-sequence current. There are still few researches on how to use the A and C phase currents of the two-phase TA distribution network to select the grounding line. Literature [4] proposed a line selection method based on A and C two-phase current traveling waves. However, the use of traveling waves r...

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Application Information

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IPC IPC(8): H02H7/26
Inventor 张艳霞方廷靳智强
Owner 南通恒力包装科技股份有限公司
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