Current Traveling Wave Differential Protection Method for Lossy Transmission Lines Against Effects of Current Transformer Saturation

A technology of current transformers and transmission lines, which is applied in the direction of emergency protection circuit devices and electrical components, and can solve problems such as the inability to meet the quick action of relay protection, large data windows, and prolonging the time of fault occurrence.

Active Publication Date: 2016-03-30
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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  • Current Traveling Wave Differential Protection Method for Lossy Transmission Lines Against Effects of Current Transformer Saturation
  • Current Traveling Wave Differential Protection Method for Lossy Transmission Lines Against Effects of Current Transformer Saturation
  • Current Traveling Wave Differential Protection Method for Lossy Transmission Lines Against Effects of Current Transformer Saturation

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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 1It 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 and the three-phase current traveling wave component at each sampling moment of the transmission line at the protection installation place of the m substation; Phase voltage traveling wave components and three-phase current traveling wave components.

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

[0024] The protection device uses phase-m...

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Abstract

The invention discloses a current-transformer-saturation-influence-resistant traveling-wave differential protection method for currents of a lossy line. The method is characterized in that voltage and current traveling-wave components of transformer station protection mounting positions at two ends of the power transmission line are acquired at various sampling moments at first, influence of line loss is taken into consideration, each current traveling-wave component of one end of the power transmission line is computed by a prediction algorithm, and the computed current traveling-wave components and the sampled current traveling-wave components at the end of the power transmission line form traveling-wave differential protection criteria for 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 the algorithm is reduced, and the protection action speed is increased; a traveling-wave protection function can be completed for a fault of the line within a quarter-period short data window by the method, the protection action speed is high, the influence of the line loss is taken into consideration, and accordingly the method is applicable to performing traveling-wave protection on power transmission lines in various voltage grades in integral transient fault procedures.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a current traveling wave differential protection method for a lossy transmission line against the saturation influence 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 cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 曾惠敏林富洪
Owner STATE GRID CORP OF CHINA
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