Shunt reactor turn-to-turn short circuit protection method and device

Abstract

The invention relates to a shunt reactor turn-to-turn short circuit protection method and device. The method comprises the following steps of acquiring the three-phase voltage and the three-phase current of a shunt reactor; calculating a characteristic value according to the three-phase voltage and the three-phase current; carrying out saturation detection on the shunt reactor according to the characteristic value; performing anomaly detection on the shunt reactor according to the characteristic value; and executing a turn-to-turn short circuit protection action in response to the simultaneous satisfaction of a saturation condition in the saturation detection and the abnormal condition in the abnormal detection and the duration of simultaneous satisfaction reaching a set action delay. According to the method and the device provided by the invention, on the premise of not sacrificing the inter-turn short circuit fault sensitivity in the region, the shunt reactor iron core saturation caused by the working conditions, such as the shunt reactor air-drop, the shunt reactor resonance, etc., can be effectively identified, so that the problem of turn-to-turn short circuit protection misoperation under the working conditions can be effectively solved.

Description

technical field [0001] The present application relates to the field of power systems, and in particular to a method and device for protecting interturn short-circuit of a shunt reactor. Background technique [0002] In the power system, the shunt reactor mainly plays the role of absorbing the excess reactive power of the power system and limiting the overvoltage level. When the high-voltage transmission line is under no load or light load, or the high-voltage cable line, the voltage at the sending end is too high, which will affect the normal operation of the power equipment at the sending end. It is necessary to install a shunt reactor on the high-voltage line or bus to absorb the excess voltage at the sending end. reactive power and limit the overvoltage level at the sending end. For shunt reactors installed on high-voltage long lines that require reclosing, they are usually equipped with neutral point reactors, which can limit the latent supply current of high-voltage lo...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of inter-turn short-circuit protection misoperation caused by the saturation of the iron core of the shunt reactor when the above-mentioned shunt reactor is air-dropped or resonant, the present invention provides a new method and device for inter-turn short-circuit protection of the shunt reactor

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