HIGH-VOLTAGE DC CURRENT BREAKER AND HIGH-VOLTAGE DC CURRENT BREAKING METHOD

摘要

Provided is a DC current breaker having a high-speed breaking function appropriate to a voltage-type converter and a DC current breaking method. In addition, provided is a DC current breaker and a DC current breaking method capable of reducing cost of the breaker and securing economical competiveness by using a relatively simple configuration. The DC current breaker for breaking a DC current at the time of occurrence of an accident includes: a main conduction unit including three high-speed mechanical switches installed to be connected in series to a main conduction path for conducting a normal-operation-state current; a power semiconductor switch installed to be connected in parallel to one high-speed mechanical switch among the high-speed mechanical switches installed in the main conduction unit for current breaking of the main conduction unit; a capacitor installed on a circuit connected in parallel to the main conduction path; and a surge arrester installed to be connected in parallel to the capacitor connected in parallel to the main conduction path. The DC current breaking method uses the DC current breaker.

主权项

1. A DC current breaker for breaking a DC current at the time of occurrence of an accident, comprising:
a main conduction unit including a commutate switch, a protection switch, and a close/open switch which are connected in series to each other in this order on a main conduction path where a current is flowed in a normal operation state, the protection switch protecting the commutate switch, and the close/open switch finally breaking a flow of a current of the main conduction unit; a power semiconductor switch connected in parallel to the commutate switch; a capacitor connected in parallel to the commutate switch and the protection switch; and a surge arrester connected in parallel to the capacitor.