Bidirectional-breaking bridge-type circuit breaker and application method thereof

Abstract

The invention discloses a bidirectional-breaking bridge-type circuit breaker and an application method thereof. The circuit breaker comprises a main current circuit, a transfer current circuit, an overvoltage limiting circuit, a firs access end (S1), and a second access end (S2). A first branch circuit of the transfer current circuit formed by the series connection of a first power semiconductor device (A1) and a fourth power semiconductor device (A4) is in parallel connection with the main current circuit. A second branch circuit of the transfer current circuit formed by the series connection of a second power semiconductor device (A2) and a third power semiconductor device (A3) is in parallel connection with the main current circuit. A power semiconductor device (A0) is a bidirectional-connection power semiconductor device, and the first, second, third, fourth and fifth power semiconductor devices (A1, A2, A3, A4 and A5) are all unidirectional-connection power semiconductor devices. The power semiconductor device (A0) and the fifth power semiconductor device (A5) can cut off the current.

Description

technical field [0001] The invention relates to a bidirectional breaking bridge circuit breaker, in particular to a bidirectional breaking bridge circuit breaker with a transfer current circuit. Background technique [0002] The hybrid circuit breaker composed of high-speed mechanical switches and high-power semiconductor devices has the advantages of large current capacity, fast shutdown speed, and strong current limiting capability, and has become a research hotspot in the field of large-capacity system breaking. A typical zero-current structure hybrid circuit breaker uses the reverse pulse current generated by the discharge of the pre-charged capacitor connected in series in the transfer current circuit to resist the current in the high-speed mechanical switch, thereby creating a current zero-crossing point in the high-speed mechanical switch. This structure is simple and reliable, but the voltage of the pre-charged capacitor is equal to the system voltage after the disco...

AI Technical Summary

Problems solved by technology

However, this patent has relatively high requirements on the performance volume of the pre-charged capacitor, and is not conducive to the breaking reliability of the circuit breaker; the high-speed mechanical switch is easy to arc during the whole process, which reduces the reliability and safety of the circuit breaker; the patent’s There are also more circuits and power semiconductor devices, which makes the reaction time of the circuit breaker longer, reduces the sensitivity and reliability of the circuit breaker, and increases the cost of the circuit breaker

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