fst442
Member
- Location
- Vancouver, WA, USA
I have questions about an existing transformer installation. There are no markings on this XFMR at all. The service voltage is 3 Phase 240v(high leg) delta. My voltage at the XFMR primary connections is 230v phase to phase across the board/ 115v to ground on A and C phase/ 206v to ground on B phase. The secondary voltage concerns me. I have 430v phase to phase across the board/221v to (derived) neutral on A and C phase/321v to (derived) neutral on B phase. Please take me back to school.
1:If my primary high leg voltage is proportional by the square root of 3(206/115=1.7) the why is the secondary high leg voltage propertional by the square root of 2(321/221=1.4)?
2:Why do I still have a high leg on the secondary at all?
1:If my primary high leg voltage is proportional by the square root of 3(206/115=1.7) the why is the secondary high leg voltage propertional by the square root of 2(321/221=1.4)?
2:Why do I still have a high leg on the secondary at all?