Distribution transformer for phase reference
Distribution transformer for phase reference
(OP)
Has anyone seen a distribution transformer used like a PT for syncing distributed generation?
What problems did you see?
What problems did you see?






RE: Distribution transformer for phase reference
RE: Distribution transformer for phase reference
old field guy
RE: Distribution transformer for phase reference
I am suspecting we have a 180 problem, but the needed 240 to 120 aux. might be messing with us also. (I suspect some wiring errors also).
So I'm asking if there might be something that I haven't seen (Like a phase shift).
RE: Distribution transformer for phase reference
thread238-204434: Transformer Polarity
You can also do a low voltage test with a primary and secondary bushing connected to determine polarity if necessary.
Alan
RE: Distribution transformer for phase reference
I foresee problems if DT is used for synchronising purpose:
1. The allowable Ratio error for DT is high, as high as 10%
2. The core of DT is allowed to saturate much earlier than PT giving rise to much higher errors if the voltage happens to be above nominal.
Referring to Instrument transformers IEC-60044 and comparing that with IEC 60076 (code for power transformers)could throw more light on the subject.
RE: Distribution transformer for phase reference
Used as an unloaded PT, you can expect the voltage shown to be high by about the same percentage as the transformer regulation, hence the turns ratio error. (Not an error really, it is a calculated amount so that the voltage will be correct at full load.)
Bill
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