High-voltage transmission line protection device and method

Abstract

The invention discloses a high-voltage transmission line protection device, which comprises a front channel processing unit, an analogue quantity acquisition unit and a central processing unit, wherein the front channel processing unit comprises a transverse channel and a longitudinal channel; the analogue quantity acquisition unit is used for acquiring voltage and current analogue quantity data of a local side of a current line; and the central processing unit is used for receiving voltage and current digital quantities of the local side of the current line, obtaining the voltage and currentdigital quantities of an opposite side of the current line through the longitudinal channel, obtaining the voltage and current digital quantities of the local side and the opposite side of an adjacentline through the transverse channel, carrying out fault analysis on the obtained voltage and current digital quantities of two sides of the current line and the voltage and current digital quantitiesof two sides of the adjacent line through a six-sequence fault component algorithm to obtain a fault ranging result. The invention further discloses a high-voltage transmission line protection method. According to the high-voltage transmission line protection device disclosed by the invention, the ranging accuracy of the lines can be improved, so that protection on the lines is achieved.

Description

technical field [0001] The invention relates to the field of power system automation, in particular to a high-voltage transmission line protection device and a high-voltage transmission line protection method. Background technique [0002] Nowadays, in order to meet the requirement of increasing transmission capacity on limited line corridor resources, multi-circuit lines on the same pole, which have the advantages of high efficiency, economy, and reliability, are widely used in engineering, especially double-circuit lines on the same pole. [0003] At present, the fault location of most substations still depends on the distance measurement module of the line protection device itself. The distance measurement principle of the existing line protection device is mainly divided into two categories. One is single-ended distance measurement, which is mainly based on the measurement of the fault circuit. The method of reactance component of positive sequence impedance; the secon...

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Problems solved by technology

However, neither of these two ranging principles is suitable for double-circuit lines on the same pole with mutual inductance, and these two ranging principles rely on accurate line parameters, which are not adaptable and have large ranging errors

[0004] At present, the ranging principle of the six-sequence fault component method based on the four-side information of parallel double-circuit lines on the same pole is relatively mature, but due to the overall structure, resource limitations and configuration principles of existing high-voltage line protection devices, line protection can only obtain This line has information on both sides of the opposite side, and the six-sequence fault component method needs to obtain four-side components. In the prior art, only two-side components can be obtained, so engineering applications cannot be realized

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