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Current-transformer-saturation-influence-resistant traveling-wave differential protection method for currents of non-loss line

A current transformer and line current technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of prolonging the fault occurrence time, failing to meet the quick action of relay protection, and large data window

Active Publication Date: 2013-09-11
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some transmission line traveling wave differential protection methods even require wavelet transform, which requires a large data window, which prolongs the time for protection to detect faults, and cannot meet the requirements of relay protection for quick action

Method used

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Embodiment Construction

[0021] The technical solution of the present invention will be further described in detail according to the accompanying drawings.

[0022] figure 1 It is a schematic diagram of the line transmission system applying the present invention. In this embodiment, the protection device first collects the three-phase voltage traveling wave component u mA (t), u mB (t), u mC (t), three-phase current traveling wave component i mA (t), i mB (t), i mC (t); collect the three-phase voltage traveling wave components u nA (t), u nB (t), u nC (t), three-phase current traveling wave component i nA (t), i nB (t), i nC (t); where t is any sampling time.

[0023] The protection device uses phase-mode conversion to convert the three-phase voltage traveling wave components of the transmission line at each sampling time t at the protective installation of the substation m into the 0, α, and β mode voltage traveling wave components u of the transmission line at the protective installation...

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Abstract

The invention discloses a current-transformer-saturation-influence-resistant traveling-wave differential protection method for currents of a non-loss line. The method is characterized in that voltage and current traveling-wave components of two ends of the power transmission line are acquired at various sampling moments at first, a current traveling-wave component of one end of the power transmission line at a current sampling moment is computed by the aid of the voltage traveling-wave component at the previous quarter-period moment, and the computed current traveling-wave component of the end of the power transmission line and the sampled current traveling-wave components of the end of the line form traveling-wave differential protection criteria for the currents. The current-transformer-saturation-influence-resistant traveling-wave differential protection method has the advantages that the current traveling-wave components at the various sampling moments are not required to be solved by means of interpolation operation, the calculation of an algorithm is reduced, and the protection action speed is increased; the method can complete a traveling-wave protection function for a fault of the power transmission line within a quarter-period short data window, and the protection action speed is high.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a lossless line current traveling wave differential protection method against the saturation effect of a current transformer. Background technique [0002] Because it is not affected by the system operation mode and grid structure and has a natural phase selection function, the current differential protection has always been the main protection of various voltage levels of transmission lines. In the 220kV and below voltage level transmission lines, because the distributed capacitance current along the transmission line is very small, the distributed capacitance has little influence on the operation performance of the current differential protection. The voltage and current transmission of EHV / UHV AC transmission lines have obvious wave process, and the distributed capacitive current along the line is very large. The traditional current differential ...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 曾惠敏林富洪
Owner STATE GRID CORP OF CHINA
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