A High Voltage DC Circuit Breaker Based on Fast Repulsion Mechanism and Isolation Transformer

Abstract

The invention discloses a high-voltage direct-current circuit breaker based on a rapid repulsion force mechanism and an insulating transformer. The circuit breaker topologically comprises a current conversion branch circuit, a main circuit breaker branch circuit, a rapid switching energy supply unit, a main loop electric reactor unit and a main loop isolation switching unit. The current conversion branch circuit is an LC oscillation branch circuit. The main circuit breaker branch circuit is formed by connecting an adjustable electric reactor and a plurality of rapid switching energy absorption voltage-sharing modules in series. Each rapid switching energy absorption voltage-sharing module is formed by connecting a rapid switch, a lightning arrester and an RC voltage-sharing branch circuit in parallel. The rapid switching energy supply unit ensures rapidity and cooperativity of actions of the rapid switches. The main loop electric reactor unit is used for reducing a fault current ascending rate. The main loop isolation switching unit is used for protecting internal components after the circuit breaker conducts breaking successfully. According to the high-voltage direct-current circuit breaker, on the basis of the rapid repulsion force mechanism and the insulating transformer, the breaking speed is high, the fault current is prevented from ascending to the larger amplitude, the voltage level borne by the circuit breaker is high, breaking reliability is high, the structure is simple, and the manufacturing cost is low.

Description

technical field [0001] The invention belongs to the field of high-voltage direct current circuit breakers, and more specifically relates to a high-voltage direct current circuit breaker based on a fast repulsion mechanism and an insulating transformer. Background technique [0002] The High Voltage Direct Current Grid (HVDCG) based on the Voltage Source Converter (Voltage Source Converter, VSC) is considered to be the best solution to solve the problem of large-scale remote wind farm group grid connection and transmission. Taking the high-voltage DC grid as the platform for wind power collection avoids the inherent stability (voltage, frequency, phase, etc.) of the AC grid, thus providing the possibility of flexible grid-connection for wind power grid-connection. However, the new problems brought about are new technologies such as the isolation of DC short-circuit faults and the DC circuit breaker for removing short-circuit faults, among which the DC circuit breaker is the m...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the object of the present invention is to provide a high-voltage DC circuit breaker based on a fast repulsion mechanism and an insulating transformer, which solves the problem that the existing high-voltage DC circuit breaker is difficult to break a large current and withstand a large voltage. The problem

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