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Lossy electric transmission line current traveling-wave differential protection method

A transmission line and differential protection technology, which is applied in the direction of automatic disconnection emergency protection devices, circuit devices, emergency protection circuit devices, etc., can solve the problem of prolonging the time, failing to meet the requirements of quick action of relay protection, and large data window And other issues

Active Publication Date: 2013-08-14
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some of the 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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  • Lossy electric transmission line current traveling-wave differential protection method
  • Lossy electric transmission line current traveling-wave differential protection method
  • Lossy electric transmission line current traveling-wave differential protection method

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Embodiment Construction

[0023] The technical solution of the present invention will be further described in detail according to the accompanying drawings.

[0024] figure 1 It is a flowchart of a current traveling wave differential protection method for a lossy transmission line applying the method of the present invention. This embodiment first collects the three-phase voltage traveling wave component and the three-phase current traveling wave component of the transmission line at each t sampling time at the protection installation place of m substation; Voltage traveling wave component and three-phase current traveling wave component.

[0025] The phase-mode transformation is used to convert the three-phase voltage traveling wave component and the three-phase current traveling wave component at each t sampling time at the m substation protection installation into the 0, α, β mode voltage traveling wave component u at each t sampling time m0 (t), u mα (t), u mβ (t) and the 0, α, β mode current t...

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Abstract

The invention discloses a lossy electric transmission line current traveling-wave differential protection method. The method comprises the following steps: collecting voltage and current traveling wave component of protection mounting parts at two ends of an electric transmission line at each sampling moment, and taking the line loss influence into consideration; calculating the current traveling wave component of one end of the electric transmission line through a forecasting algorithm, and forming current traveling wave differential protection according to the obtained current traveling wave component and the sampled traveling wave component of the line at the end, if differential protection for traveling wave of any phase current initiates, sending trip signals to circuit breakers at two ends of the line of the phase. According to the method, the interpolation operation is not needed to get the current traveling wave component at each sampling moment, so as to reduce current traveling wave protection calculation amount, and improve current traveling wave differential protection action speed; the electric transmission line current traveling wave protection function can be finished in a short data window with one-fourth period; the protection action speed is fast; and the line loss influence is taken into consideration. Therefore, the method is suitable for the traveling wave protection of a whole breakdown transient process of lossy transmission lines at various voltage levels.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a method for current traveling wave differential protection of a lossy transmission line. 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. However, the voltage and current transmission of EHV / UHV AC transmission lines has an obvious wave process, and the distributed capacitance current along the line is very large. The protection is faced with the large starting current of t...

Claims

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Application Information

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IPC IPC(8): H02H3/26H02H7/26
Inventor 林富洪
Owner STATE GRID CORP OF CHINA
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