CDG16
Electrical
- Aug 9, 2004
- 8
Could someone please explain the equivalent zero sequence circuit for a 2-winding Star/Star TX (HV ungrounded and LV grounded). The confusion is that PRAG shows that no zero sequence current will flow for ph-E faults. But, the J&P TX Book shows a link to the zero bus on the LV side. (I found several other books showing these circuits both ways).
The only explanation for this is that J&P might assume the tank acting as a delta and therefore the closed link to the zero bus. The problem is, if you assume the PRAG is correct, then for a ph-E fault on the LV, no current will flow. But the winding has basically a short across it - it does not make sense...
Could someone please explain this better.
Thanks in advance.
The only explanation for this is that J&P might assume the tank acting as a delta and therefore the closed link to the zero bus. The problem is, if you assume the PRAG is correct, then for a ph-E fault on the LV, no current will flow. But the winding has basically a short across it - it does not make sense...
Could someone please explain this better.
Thanks in advance.