A high voltage direct current gas circuit breaker

Abstract

The invention discloses a high-voltage direct current gas breaker which can cut off fault currents under high nominal voltage classes. The high-voltage direct current gas breaker comprises a superconducting current limiter and a hydrogen breaker which are connected in series. The working principle is that the fault currents are limited by the superconducting current limiter first and then are cut off by the hydrogen breaker, so that the purpose of cutting of the fault currents is achieved. The high-voltage direct current gas breaker has advantages of being fast in response speed, low in current overload coefficient, simple in structure, small in size, low in overvoltage, safe and reliable, the short circuit current value of a circuit cannot exceed the quench current value of the superconducting current limiter, and other equipment can be protected.

Description

technical field [0001] The invention relates to the technical field of circuit breakers, in particular to a high-voltage DC gas circuit breaker. Background technique [0002] At present, the principles of the commonly used high-voltage DC circuit breakers are self-excited oscillation type, which excites the oscillation type and uses the current limiting device to limit the current first and then break the type. Using a current limiter to first limit the current and then break it is a hot research direction today, which is also inseparable from the rapid development of the current current limiting technology. There are two main reasons why current limiting technology has attracted attention: First, as the capacity of the power grid continues to increase, the level of short-circuit current also increases. Limiting short-circuit current can improve the safety and stability of the power system, the quality of power supply of the power grid, and the operation of the power grid. ...

AI Technical Summary

Problems solved by technology

There are two main reasons why current limiting technology has attracted attention: First, as the capacity of the power grid continues to increase, the level of short-circuit current also increases. Limiting short-circuit current can improve the safety and stability of the power system, the quality of power supply of the power grid, and the operation of the power grid. Flexibility; second, the existing power devices have low overload capacity, and the di / dt and du / dt that can be tolerated are limited. In order to prevent breakdown or damage to power devices when a fault occurs, a current limiter is required

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