Discussion
A dc generator is protected against reverse current when paralleled with a battery by
Answer: C
Correct answer: a reverse current relay or a blocking arrangement
If the generator’s voltage falls below that of the battery - because its speed drops or its prime mover stops - the battery will drive current back into it and run it as a motor, which may damage the machine or the prime mover. A reverse current relay senses the direction of current and trips the circuit breaker, and in modern practice a blocking diode achieves the same end passively. The equalizer connection addresses a different problem, the sharing of load between compound machines.
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