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Gentlemen: Please forward any ideas.
13.8KV/480,3PH/3W,1000 KVA, Delta-Y, Resistance Grounded serving a Motor Control Center. No Neutral Conductor.
Measured Secondary Voltage Phase to Phase 480V, all Phases.
Measure Phase Currents 80 A, 80 A, 85 A.
Measure Secondary Voltage Phase to Ground at the MCC:
P1 - 420 V
P2 - 380 V
P3 - 77 V
Any ideas about whats going on with this transformer and distribution system ?
13.8KV/480,3PH/3W,1000 KVA, Delta-Y, Resistance Grounded serving a Motor Control Center. No Neutral Conductor.
Measured Secondary Voltage Phase to Phase 480V, all Phases.
Measure Phase Currents 80 A, 80 A, 85 A.
Measure Secondary Voltage Phase to Ground at the MCC:
P1 - 420 V
P2 - 380 V
P3 - 77 V
Any ideas about whats going on with this transformer and distribution system ?