zero sequence imp for a Delta/Star transformer
zero sequence imp for a Delta/Star transformer
(OP)
hi, if i want to test the Zeoro sequence impedance of a Delta/Star transformer, how do i do it. am i correct to test it on te Secondary Star connection ith a neutral? pls help.






RE: zero sequence imp for a Delta/Star transformer
RE: zero sequence imp for a Delta/Star transformer
1. Connect all three terminals together.
2. Apply a voltage between the shorted terminals and neutral.
3. Measure the current.
4. Divide the former by the latter.
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: zero sequence imp for a Delta/Star transformer
=====================================
(2B)+(2B)' ?
RE: zero sequence imp for a Delta/Star transformer
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: zero sequence imp for a Delta/Star transformer
RE: zero sequence imp for a Delta/Star transformer
=====================================
(2B)+(2B)' ?
RE: zero sequence imp for a Delta/Star transformer
=====================================
(2B)+(2B)' ?
RE: zero sequence imp for a Delta/Star transformer
David Castor
www.cvoes.com
RE: zero sequence imp for a Delta/Star transformer
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: zero sequence imp for a Delta/Star transformer
RE: zero sequence imp for a Delta/Star transformer
A ground fault on one phase of the wye will be seen as a phase to phase fault on the primary. The current for a single phase load will be supplied from all three primary windings.
50% of the current will be supplied by the "in phase" winding.
50% of the current will be supplied by the other two windings, one at a leading phase angle and one at a lagging phase angle.
This is in a perfect world. In the real world the impedances of the supply conductors may skew the percentage slightly.
Bill
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"Why not the best?"
Jimmy Carter