Tank-type circuit breaker

摘要

Capacitors (5a, 5b) are provided in the insulators of bushings (4a, 4b), respectively. One ends of the capacitors (5a, 5b) are connected to central conductors (3a, 3b) side, and the other ends are connected to a tank (1) side at the ground potential. When a discharge signal from the outside of the tank (1) reaches the capacitors (5a, 5b) through the central conductors (3a, 3b), the capacitors (5a, 5b) work as a filter to attenuate and prevent the signal in the frequency band of the discharge waveform from propagating to the inside of the tank (1). When an antenna (7) placed in the tank (1) receives a signal in the frequency band of the discharge waveform, a discharge detection unit (20) determines that a discharge inside the tank has been detected.

主权项

1. A tank-type circuit breaker comprising:
a tank filled with an insulating medium; a current interruption unit placed in the tank; first and second bushings connected to the input and output sides of the current interruption unit, respectively, and placed across the outside and inside of the tank; first and second low-pass filters placed around central conductors of the first and second bushings and electrically connected to a ground of the tank, respectively, for attenuating an external discharge signal in a discharge frequency band propagating from the outside of the tank; an antenna placed in a sealed region of the tank for receiving a discharge signal in the discharge frequency band; and a discharge detection unit for performing arithmetic processing on the discharge signal received by the antenna to detect a discharge inside the tank.