What is negative phase sequence?
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Answer Posted / sunil kumar sinha
In a three phase AC circuit, current is consetuted of
positive sequence, negative sequence and zero sequence
current.
the positive phase sequence current flows as perr the load
connected to the circuit. The negative phase sequence
current will flow due to diffence of three phase volages of
the system.If no difference of R Y B voltage is present,
the negative sequence current will not flow. The negative
phase sequence current present in the circuit will be of
same frequency but the phase sequence will be negative to
the system sequence. Negative sequence current will cause
excessive heating of generator rotor as the rotor will
experience double the system frequency so far the negative
sequence current is concerned. The zero sequence current is
present only in case of earth fault otherwise it is absent.
| Is This Answer Correct ? | 176 Yes | 16 No |
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