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Restriking voltage and recovery voltage
It is the transient voltage that appears across the contacts at or near current zero during arcing period.If dielectric strength rise is greater than the rise of restriking voltage then the arc will not restrike.
it is the transient voltage that exists during the arcing time. ( natural frequency kHz ).
it is the rms voltage after final arc extinction. ( normal frequency 50 or 60 Hz). both voltages appear between circuit breaker poles.
· A circuit breaker is a piece of equipment which can Make or break a circuit either manually or by remote control under normal conditions.
· Break a circuit automatically under fault condition
· Make a circuit either manually or by remote under fault condition
· Circuit Breaker consists of fixed and moving contacts called electrodes
· Under normal operating condition these contacts remain closed and will not open automatically unless the system becomes faulty .These contacts can be opened manually or by remote control.
· When a fault occurs in a circuit the trip coils of the circuit breaker get energized and the moving contacts are pulled apart by some mechanism ,thus opening the circuit.
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