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What happens when a phase gets disconnected in a 3 phase four wire and 3 phase three wire system?

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2015-07-14 15:52:46
2015-07-14 15:52:46

Can u imagine a merrygoround with so many kids on it that three kids can hardly turn it? now imagine that same merrygoround with only two kids trying to turn it. Same thing with one line missing. it will sit there and burn until a breaker goes or the other kids burn out.

If you have a motor running it will run until it is stopped but it wont start again.

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motors;

called single phasing,, the other 2 phases ampers increase and trip the motor overloads.. or blow fuses

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If one phase fails in a three phase system it will cause the voltage to drop.

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Nothing happens. This is a normal way to obtain a single phase system from a three phase system.

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The overload protection system of the motor should activate immediatly to save the motor from burning.

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The voltages in each of the three coils of a three phase system will be equal no matter what voltage the system uses.

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A two-phase system is archaic and you are unlikely to find it in use anywhere these days, so it is mainly of historical interest. A two-phase, three-wire system, consists of two phase voltages, displaced from each other by 90 electrical degrees, and a phase voltage which is 1.414 x phase voltage.A three-phase system consists of three phase voltages which are displaced from each other by 120 electrical degrees. In the case of a three-phase, three-wire, system, the line voltages are numerically equal to the phase voltages; in the case of a three-phase, four-wire, system, the line voltages are 1.732 x phase voltage.


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