During current chopping the current actually breaks..a)During the inst...
Current chopping in circuit breaker is defined as a phenomenon in which current is forcibly interrupted before the natural current zero. Current Chopping is mainly observed in vacuum circuit breaker and air blast circuit breaker. There is no such phenomena in oil circuit breaker. Current chopping is predominant while switching shunt reactor or unloaded transformer.
Generally the arc extinction in a circuit breaker take place at natural current zero. But this is true if the capacity of the breaker to extinguish the arc varies with the level of fault current. This means that, the arc extinction capability of breaker will always ensure that arc extinction is taking place at natural current zero.
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During current chopping the current actually breaks..a)During the inst...
Explanation:
During current chopping, the current through a circuit is interrupted or broken. This phenomenon is commonly observed in circuit breakers or switching devices when they open to interrupt the flow of current.
Instant of Natural Current Zero:
The instant of natural current zero refers to the moment when the current through the circuit naturally reaches zero. This occurs when the alternating current waveform passes through its zero-crossing point.
During the instant of natural current zero, there is no current flowing through the circuit, and the current is about to change its direction. It is important to note that the current chopping phenomenon occurs before the instant of natural current zero.
Explanation of the Options:
a) During the instant of natural current zero: This option is incorrect because current chopping occurs before the instant of natural current zero, not during it. Current chopping happens when the circuit is opened or the switch is turned off, causing a rapid decrease in current.
b) Before the instant of natural current zero: This option is correct. Current chopping occurs before the instant of natural current zero. When the circuit is opened or the switch is turned off, the current through the circuit rapidly decreases and breaks before reaching zero.
c) After the instant of natural current zero: This option is incorrect. Current chopping occurs before the instant of natural current zero, not after it.
d) Irrespective of the instant of natural zero: This option is incorrect. Current chopping is specifically related to the interruption of current before the instant of natural current zero. It is not a phenomenon that occurs irrespective of the instant of natural zero.
Conclusion:
During current chopping, the current through a circuit is interrupted or broken before the instant of natural current zero. This phenomenon occurs when the circuit is opened or the switch is turned off, causing a rapid decrease in current.