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At the time it reaches the tripping end, the breaker opens the circuit. Different curves are possible by adjusting the liquid flow by means of a small hole of calibrated diameter. Therefore, the pair coil-spring (force and counter-force) adjusts the steady current capacity, and the pair liquid-hole (drag force) adjust the tripping curve.
Examples of TRV waveshapes. A transient recovery voltage (TRV) for high-voltage circuit breakers is the voltage that appears across the terminals after current interruption. It is a critical parameter for fault interruption by a high-voltage circuit breaker, its characteristics (amplitude, rate of rise) can lead either to a successful current interruption or to a failure (called reignition or ...
At two multiples of the rated current, the recloser's rapid trip curve can cause a trip (off circuit) in as little as 1.5 cycles (or 30 milliseconds). During those 1.5 cycles, other separate circuits can see voltage dips or blinks until the affected circuit opens to stop the fault current.
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A shunt-trip unit appears similar to a normal breaker and the moving actuators are ganged to a normal breaker mechanism to operate together in a similar way, but the shunt trip is a solenoid intended to be operated by an external constant-voltage signal, rather than a current, commonly the local mains voltage or DC. These are often used to cut ...
circuit breaker panel A distribution board for electric power that uses circuit breakers as protective elements. circuit breaker An automatically operated electrical switch that opens to interrupt a short circuit or other fault. circuit theory The mathematical theory of electrical circuits. Circuit Total Limitation (CTL)