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Fault distance measurement method of T-type power transmission network and application of fault location method

A technology of fault distance measurement and network, applied in the direction of fault location, etc., can solve problems such as application

Inactive Publication Date: 2014-09-24
STATE GRID CORP OF CHINA +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that various distance measuring methods are difficult to apply in the multi-branch tree structure transmission network, the present invention proposes a fault distance measurement method and application of a T-shaped transmission network, using the principle of assumption and recursion, The multi-terminal fault location of the transmission network is simplified to the double-terminal fault location of the transmission line, so that the mature double-terminal fault location method can be used

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  • Fault distance measurement method of T-type power transmission network and application of fault location method
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  • Fault distance measurement method of T-type power transmission network and application of fault location method

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[0099] (1) According to the method described in the content of the invention, the fault starting point judgment, digital filtering, and positive sequence component calculation are respectively performed on the fault recording data of Xinairi Wind Power, Lesheng Wind Power, Laifu Wind Power, and Daan Substation, and each end node is obtained positive sequence voltage and current.

[0100] (2) Assuming that the fault occurs on Fuda Line 1, according to the method described in the content of the invention, the positive sequence voltage and current of the Lesheng T contact are calculated from the positive sequence voltage and current of Lesheng Wind Power and Xin Airi Wind Power, and at the same time, the Lesheng Correction coefficients for Sheng Branch Line and New Airy Wind Power 2;

[0101] (3) Calculate the positive sequence voltage and current of the new Airy T-junction from the positive-sequence voltage and current of the T-junction of Laifu Wind Power and Lesheng, and obtai...

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Abstract

The invention relates to a fault distance measurement method of a T-type power transmission network and application of the fault distance measurement method. The T-type power transmission network has three lines including L1, L2 and L3, three nodes located on the ends and capable of recording fault data and one T node which cannot record fault data, wherein the three nodes capable of recording the fault data include P1, P2 and P3. The lines are simple impedance models. When faults occur, oscillographs can record fault waveforms of all ends, are not synchronous and have certain phase differences. The method includes the following steps of judging a fault starting point, carrying out digital filtering on the electric analog quantity collected by the oscillographs, carrying out positive-sequence component calculation, simplifying the T-type power transmission network to be a double-end network, carrying out result judgment on fault distances including d1, d2 and d3 and correction coefficients including k1, k2 and k3 on the lines including L1, L2 and L3 to obtain correct fault distance measurement. The T-type power transmission network fault distance measurement method can be applied to multi-end fault distance measurement of a tree-form power transmission network.

Description

technical field [0001] The invention relates to a fault distance measurement method and application of a T-shaped power transmission network, and belongs to the technical field of power system fault distance measurement. Background technique [0002] In recent years, with the rapid development of wind power generation technology, large-scale wind power grid connection makes the wind farm transmission network present a complex multi-branch tree structure. The complexity of the transmission network structure increases the risk of accidents in the power system, and the scope of the accident also increases accordingly. In order to eliminate the fault as soon as possible after the fault occurs and restore the operation of the power system, it is necessary to perform fault location quickly and accurately . [0003] According to the division of data sources, the principle of fault location in transmission network is generally divided into single-terminal, double-terminal and multi...

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Application Information

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IPC IPC(8): G01R31/08
Inventor 郑太一王建勋马丽红刘大鹏崔运海
Owner STATE GRID CORP OF CHINA
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