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A Lossy Transmission Line Voltage Traveling Wave Protection Method

A transmission line and voltage traveling wave technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of inability to meet the requirements of rapid action of relay protection, large data window, and extended traveling wave protection time.

Active Publication Date: 2015-11-04
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 traveling wave differential protection methods for transmission lines even require wavelet transform, which requires a large data window, which prolongs the time for traveling wave protection to detect transmission line faults, and cannot meet the requirements of relay protection for quick action.

Method used

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  • A Lossy Transmission Line Voltage Traveling Wave Protection Method
  • A Lossy Transmission Line Voltage Traveling Wave Protection Method
  • A Lossy Transmission Line Voltage Traveling Wave Protection Method

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Embodiment Construction

[0018] The technical solution of the present invention will be further described in detail according to the accompanying drawings.

[0019] figure 1 It is a flow chart of a lossy transmission line voltage traveling wave protection method 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.

[0020] The phase-mode transformation is used to convert the three-phase voltage traveling wave components and three-phase current traveling wave components at each sampling time t of the m substation protection installation into the 0, α, and β mode voltage traveling wave components u at each sampling time t m0 (t), u mα (t), u mβ (t) and the 0, α, β mode current traveling wave c...

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Abstract

The invention discloses a lossy electric transmission line voltage traveling wave protection method. The method comprises the following steps: collecting voltage and current traveling wave component of two ends of the electric transmission line at each sampling moment, and taking the electric transmission line loss influence into consideration; utilizing traveling wave component of a one-fourth period short data window to calculate voltage traveling wave component of one end of the electric transmission line; and utilizing the calculated voltage traveling wave component of one end of the transmission line and the sampled voltage traveling wave component of the line at the end to form voltage traveling wave protection criterion, so as to judge whether the transmission line is broken down or not. The method can finish transmission line traveling wave protection function in the one-fourth period short data window, directly calculate the voltage traveling wave component at each sampling moment without adopting the interpolation operation, greatly reduce traveling wave protection calculation amount, improve traveling wave protection action speed, and take electric transmission line loss influence 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 traveling wave protection, in particular to a lossy transmission line voltage traveling wave protection method. Background technique [0002] Traveling wave differential protection considers the influence of distributed capacitance in the mathematical model of protection algorithm. In principle, traveling wave differential protection is not affected by distributed capacitance of transmission lines and has high operating performance. Application No. 200910034669.1 Invention Patent "Traveling Wave Differential Protection Method Applicable to Series Capacitance Compensation Line" solves the influence of distributed capacitance on the performance of differential protection, but for the case where the traveling wave propagation delay is a non-integer multiple of the sampling interval, it needs Obtaining the electrical quantity at each time point through interpolation operation has very hi...

Claims

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Application Information

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