Answer: prevent excessive currents
Answer: a resistance decreasing with voltage rise across the arc
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Answer: higher frequencies entering generator or transformer units
Answer: Circuit breaker with SF6 gas
Answer: in phase with the arc current
Answer: 100 mega ohms
Answer: higher frequencies entering generator or transformer units
Answer: all of the above
Answer: interception, conduction and dissipation
Answer: all of the above
Answer: Station batteries are used to operate relay only
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