stevenal
Electrical
- Aug 20, 2001
- 3,826
Any problem with using full three element metering on an ungrounded delta service? Normally this would require two elements and an 8 jaw meter, but it is already in place with three elements and 13 jaws. The potential transformers are connected wye, and are rated for line to line voltage. I was originally concerned that the wye point potential could move about based on PT impedance and burden. But after drawing a few phasor diagrams, I cannot find a wye point position that will cause an error, even if it should move outside the delta. Other than the weird no-load voltages Davibeach is seeing, is there any other problem with this arrangement? This is for revenue, and the meter in question is an electronic auto ranging meter. Thanks.