Phase shift transformers
Phase shift transformers
(OP)
What does it mean exactly and in details:
Vector Group Dd11.75 d0.75 and
Dd0.25d11.25.
Thanks
Vector Group Dd11.75 d0.75 and
Dd0.25d11.25.
Thanks
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RE: Phase shift transformers
RE: Phase shift transformers
These transformers (double secondary each) feed VFDs and provide harmonic mitigation.
The first one gets +7.5º and the second -7.5º.
This means 24 pulses for harmonic cancellation, I suppose.
I would like to know the meaning of numbering 11.75, 0.75, 0.25...
Thanks again
RE: Phase shift transformers
11.75 means 11h 45 minutes
0.25 means 12h 15 minutes
0.75 means 12h 45 minutes
on phasor diagram representig as clock (12h is zero degree)
Milovan Milosevic