single phase 3 wire transformer primary fault
single phase 3 wire transformer primary fault
(OP)
If one has an open conductor fault on a medium voltage single phase overhead circuit (phase to neutral), then have a question;
Is the fault current or voltage level different between the two scenarios below where the circuit above feeds a single phase transformer with a 120/240 volt 3 wire secondary?
1) Case 1; the center tapped secondary winding is connected to earth at the transformer pole
2) Case 2; the center tapped secondary winding is NOT connected to earth at the transformer pole






RE: single phase 3 wire transformer primary fault
If the center tap is earthed and not connected to the utilities neutral fault current will not cross over unless the MV phase drops into the LV 120/240 supply.
But a lot more detail is needed, in addition to the goals or concerns.
Hope this helps :)
RE: single phase 3 wire transformer primary fault
Bill
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