Motor Starting on the HV side of its feeder transforme
Motor Starting on the HV side of its feeder transforme
(OP)
Gents,
In a project with which I'm involved it is proposed that a squirrel-cage induction motor (1250 HP 3.3 kV) be direct-connected to its dedicated feeder transformer secondary (approx 2,500 kVA) and then started and stopped (running for a week at a time aproximately) by means of the 33 kV circuit breaker on the primary side of the transformer. I am looking for guidance on what to tell the transformer manufacturer (apart from the obvious) and what the impact is on the protection schemes and any other hardware, particularly the coincidence of motor and transformer inrush currets. Can someone direct me to any authoratative writings please? I've Googled but not found much.
Thanks
Peter.
In a project with which I'm involved it is proposed that a squirrel-cage induction motor (1250 HP 3.3 kV) be direct-connected to its dedicated feeder transformer secondary (approx 2,500 kVA) and then started and stopped (running for a week at a time aproximately) by means of the 33 kV circuit breaker on the primary side of the transformer. I am looking for guidance on what to tell the transformer manufacturer (apart from the obvious) and what the impact is on the protection schemes and any other hardware, particularly the coincidence of motor and transformer inrush currets. Can someone direct me to any authoratative writings please? I've Googled but not found much.
Thanks
Peter.





RE: Motor Starting on the HV side of its feeder transforme
My biggest concern would be wear and tear on the 33kV breaker; anything at that level is not inexpensive! Most HV equipment is not designed for that kind of duty cycle. Has anyone consulted the manufacturer? If it's new, has this been brought up from a feasibility standpoint with leading equipment mfrs? I would start there.
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