HIGH-VOLTAGE DC CIRCUIT BREAKER

摘要

The present invention relates to a high-voltage direct current (DC) circuit breaker which interrupts a fault current flowing in a power transmission or power distribution DC line when a fault occurs in the DC line. The high-voltage DC circuit breaker according to the present invention comprises: a main switch, installed in the DC line, for interrupting a current in the DC line by being opened when a fault occurs in one side or the other side of the DC line; a nonlinear resistor, connected in parallel to the main switch, for consuming overvoltage; an LC circuit connected in parallel to the main switch and comprising a capacitor and an inductor that are connected to each other in series to generate LC resonance; a first switching element, connected in parallel to the LC circuit, for switching in such a manner that the polarity of a positive voltage (+VC) or a negative voltage (−VC) charged at the capacitor by the resonance of the LC circuit can be changed and charged; and a second switching element, connected between the LC circuit and the DC line so as to be connected in series to the LC circuit, for switching in such a manner that the current pulse, generated by −VC voltage or +VC voltage charged at the capacitor, can be supplied to the main switch.

主权项

1. A high-voltage DC circuit breaker for blocking current flowing through a DC line, comprising:
a main switch (110) connected to the DC line, and configured to be opened when a fault occurs on a first side or a second side of the DC line, thus blocking a current flowing through the DC line; an LC circuit (130) connected in parallel with the main switch (110) and provided with a capacitor (131) and an inductor (132) connected in series with each other to produce LC resonance; a first switching element (G1) connected in parallel with the LC circuit (130) and configured to perform switching so that a positive voltage (+Vc) or a negative voltage (−Vc) stored in the capacitor (131) via resonance produced by the LC circuit (130) is charged, with a polarity of the positive or the negative voltage changed; and a second switching element (G2) connected in series with the LC circuit (130) and connected between the LC circuit (130) and the DC line, the second switching element (G2) performing switching so that a current pulse, generated by the voltage (+Vc) or (−Vc) charged in the capacitor (131), is supplied to the main switch (110).