Method and system for evaluating on-off performance of high-voltage circuit breaker, and medium

Abstract

The invention discloses a method and a system for evaluating the on-off performance of a high-voltage circuit breaker, and a medium. The evaluation method comprises the following steps: establishing asimplified enthalpy flow model for switching on / off asymmetric short-circuit current of the high-voltage circuit breaker according to related parameters of the high-voltage circuit breaker; performing simulating by adopting a simplified enthalpy flow model, simulating asymmetric short-circuit current, and obtaining curves of arc current and arc voltage in a current zero region along with time change; establishing an arc black box model; extracting parameters of the electric arc black box model according to the curve of the electric arc current and the electric arc voltage in the current zeroarea along with time change; replacing the electric arc of the high-voltage circuit breaker with the electric arc black box model, and establishing a circuit simulation model for simulating asymmetricshort-circuit current; performing simulating by adopting the circuit simulation model to generate an asymmetric short-circuit current to obtain a current waveform; and evaluating the asymmetric short-circuit current breaking capacity of the high-voltage circuit breaker according to the current waveform. The method and system have the advantages of being high in accuracy, wide in applicability, high in efficiency and low in cost.

Description

technical field [0001] The invention relates to the technical field of high-voltage circuit breakers, in particular to a method, medium and system for evaluating the breaking performance of high-voltage circuit breakers. Background technique [0002] With the development of the power system, the scale of the power grid continues to expand, and the connection between power sources is getting closer. The X / R ratio (reactance-to-impedance ratio) of the grid continues to increase, the DC component decay time constant of the short-circuit current in the grid continues to increase, the problem of excessive short-circuit current in power and load-intensive areas is prominent, and the hidden danger of insufficient breaking capacity of circuit breakers is prominent. It is an unavoidable major technical and economic problem in the development of power grid. At the same time, the main protection action time of the ultra-high voltage power grid is continuously shortened, and the DC com...

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Problems solved by technology

[0005] Embodiments of the present invention provide a method, medium and system for evaluating the breaking performance of a high-voltage circuit breaker, so as to solve the problem that the evaluation of the breaking performance of a high-voltage circuit breaker in the prior art cannot combine high accuracy, wide applicability, high efficiency and low cost problem

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