Discussion
Given below are two statements :
Statement I : Air blast circuit breaker is useful for low magnitude current extinction.
Statement II : Minimum oil circuit breaker should be used up to 220 kV voltage level.
In the light of the above statements, choose the most appropriate answer from the options given below.
Answer: C
The answer is Statement I is false but Statement II is true.
Statement I is false: an air blast breaker's extinguishing power is the same whatever the current. When it interrupts a small current, such as the magnetising current of an unloaded transformer, the arc is cut off before current zero (current chopping), causing high overvoltages. It is suited to interrupting large currents at high voltage quickly, not to low-magnitude currents.
Statement II is true: minimum oil breakers, which use a small quantity of oil only for arc quenching, are used for medium and high voltages up to about the 220 kV level; above that, air blast and SF6 breakers take over.
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