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Explain the operation of the protection system on a three phase transmission line in the event of a given common fault. Fuses, circuit breakers, over current relays and under voltage relays are used as protection devices to protect transmission lines, generators, transformers and loads on a 3 phase network. Describe the operation of such protection system in the event of the following faults: a.Phase to phase fault b.Phase to neutral fault
And got the following answer:
Ideally, a phase to phase fault would trigger opening of at least one phase. Phase to neutral would cause the affected phase to open. They might also reclose a few times. Fuses open on overcurrent, and usually have a melt curve approximately similar to the wire they protect. Circuit breakers can reclose. For small molded-case breakers, it is usually manual. Large substation breakers might reclose automatically, or by remote control Overcurrent relays sense too many amps going through a wire, and trigger a circuit breaker, disconnect, or interrupter of some type. Undervoltage relays sense low voltages (such as due to a short circuit) and may work together with overcurrent relays to build a more accurate picture of where a short might be, and which lines need to be isolated.
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