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موضوع
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What is current chopping phenomenon? In which type of circuit breaker (SF6 or VCB) it is more severe?
What is current chopping phenomenon? In which type of circuit breaker (SF6 or VCB) it is more severe?
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پاسخها
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current chopping in CB is the incident of arc current interruption before normal current zero is reached.If This current is enough to deliver a voltage which is greater than restriking voltage then the arc will continue again. But gradually the current falls and certainly the voltage also reduces and finally fall down the restriking voltage and ultimately arc is extinguished. It results in voltage oscillation in the line which affects the electrical equipments. I think it is severe in Vacuum circuit breakers (VCB)
In addition to my earlier response information available at the following link is releavnt and useful “http://www.csanyigroup.com/comparison-between-vacuum-and-sf6-circuit-breaker
How severe the capacitor switching through VCB?, and what all the points to be consider for cap switching? and what is the instantaneous current during switching and immediate voltage after tripping for 250KVAR on 12KV system voltage?
The physical processes during the capacitive switching duty for vacumm circuit breakers have been studied by T. Kamakawaji, T. Shioiri, T. Funahashi, Y. Satoh, E. Kaneko and I. Oshima,
there are certain circumtances like disconnecting transformer on no load in which it is necessary to interrupt small inductive current.the no-load current of a transformer is almost at zero power factor lagging.This current is normally smaller than the normal current rating of the breaker.interrupting such current causes severe duty on circuit breaker.this phenomenon is called current chopping.
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