An Overvoltage Suppression Method Based on Close-Coupled Split Reactor Parallel Breaking Scheme

Abstract

The invention discloses a tightly-coupled split reactor parallel breaking scheme-based overvoltage suppression method, which is suitable for a first topological structure of a generator circuit breaker and a second topological structure of the generator circuit breaker. Firstly, an overvoltage mathematical expression and a maximum overvoltage multiple between two arms of a reactor under the condition that fractures are not simultaneously broken are provided for a specific topological structure; overvoltage suppression measures are taken on the two arms of the tightly-coupled split reactor through a resistance-capacitance protection device on the basis of a theoretical calculation result; a resistance-capacitance parameter value calculation method is provided; and the resistance-capacitance protection device comprises a vacuum contactor K, a protection resistor and a protection capacitor. The tightly-coupled split reactor parallel breaking scheme-based overvoltage suppression method has the beneficial effects that an insulation test for the reactor on the basis of the tightly-coupled split reactor parallel breaking scheme can be analyzed and corresponding protection measures are formulated; and the insulation damage to the two arms of the reactor caused by overvoltage when the circuit breaker is not simultaneously broken is avoided.

Description

technical field [0001] The invention belongs to the technical field of high-voltage insulation of power systems, and in particular relates to an overvoltage suppression method based on a parallel breaking scheme of tightly coupled split reactors. Background technique [0002] The parallel vacuum circuit breaker scheme based on high-coupling split reactors adopts a parallel circuit breaker structure based on high-coupling split reactors, and the rated current and switching capacity of the circuit breaker can be improved by parallel operation of large-capacity vacuum circuit breakers. Ability to break short-circuit current. The parallel connection of double interrupter vacuum circuit breakers based on tightly coupled reactors can achieve a short-circuit current breaking capacity of 160kA, with low operation and maintenance costs, and can meet the short-circuit protection requirements of the test station’s impact generator outlet. At present, this scheme has been used in the t...

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Problems solved by technology

At present, this scheme has been used in the test station, and the operation experience of the test station shows that when the two fractures in the same phase are broken in a non-synchronous manner, the vacuum interrupter cuts off the current, resulting in an overvoltage and causing an insulation breakdown accident between the two arms of the reactor.

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