Timeline for 75kva three phase 208v delta to three phase 208v y transformer wiring/results?
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
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| Jul 7, 2016 at 18:26 | comment | added | rfkortekaas | Can you measure the voltage between the jumpers and ground? | |
| Jul 6, 2016 at 20:05 | comment | added | Dan | Unfortunately I don't have a meter sensitive enough to test the resistance. Any workaround? | |
| Jul 6, 2016 at 18:02 | comment | added | rfkortekaas | Unbalance will probably the cause then. So the phase angles are not 120 degrees. Or one of the windings in the transformer is off. Can you measure the resistance of each winding? | |
| Jul 6, 2016 at 17:59 | comment | added | Dan | I also ran the same battery of tests once the transformer was powered by the generator. The idle current draw was similar to the original results, H3-16amps, H2-10amps and H1-12amps. The neutral/ground was 7volts, X3 to ground was 111volts, X2 to ground was 118volts and X1 to ground was 122volts. All three secondary phases were 122volts to neutral. | |
| Jul 6, 2016 at 17:58 | comment | added | Dan | This is great. Thanks for the info. Building’s service does not have a high leg. The voltage was tested and was between 208-210volts across all three phases. Something else must be wrong with my building’s service because I just hooked the transformer up to one of our 60kw generators and it powers up with any phase order. It’s just plain weird. | |
| Jul 6, 2016 at 17:57 | history | edited | rfkortekaas | CC BY-SA 3.0 |
deleted 2 characters in body
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| Jul 6, 2016 at 17:34 | history | answered | rfkortekaas | CC BY-SA 3.0 |