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6 MVA transformer secondary is rated for 725V at no load.
The incommer ACB is rated at 690 V, 3200 Amp. Would there
be any effect on performance of ACB due to lower voltage
rating?
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Answer Posted / mnm
Your selection is OK. Any breaker will have 110% voltage
withstand capability. Only thing is interruption capability
reduces, which is not relevent on no-load. On load, the
voltage of the transformer will reduce by nearly 6%, due to
impedance, making it just suitable.
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