1 Phase Motors and Fault Calc's
1 Phase Motors and Fault Calc's
(OP)
Hey All,
I didnt' think about it much, but IEEE red book does not give any guidance about the inclusion of single phase motors in fault calculations. Am I missing something,...any reason for this?
Mike
I didnt' think about it much, but IEEE red book does not give any guidance about the inclusion of single phase motors in fault calculations. Am I missing something,...any reason for this?
Mike






RE: 1 Phase Motors and Fault Calc's
I've always neglected single-phase motor contributions. I think this is an allowed assumption per ANSI C37 procedures.
RE: 1 Phase Motors and Fault Calc's
Mike
RE: 1 Phase Motors and Fault Calc's
Several factors contribute to make less critical the performance of SC for single phase motors:
- The power source is usualy a small transformr, producing small available SC.
- Cost of SC study was difficult to justify for small installation.
- Single phase motors are relative small capacity typically up to 5 HP.
- At LV the cable impedance is relativelly high. Therefore the SC is damping rapidly to safe levels.
- The contribution to SC is relatively small.