I will try to explain this as best I can...
We have a 120/208 YY PMT at a solar farm. The farm has several single phase solar generators connected, and all have dropped out when I removed an elbow, testing single phasing conditions. They recently have added another 300kW of three phase generators that are parallelled in with the single phase generators feeding back onto the "grid".
Now when I remove an elbow ("C" phase) to test a single phasing condition, the generators are still producing voltage, but at a higher voltage than normal. My voltages are 124 A-G, 124 B-G, and 135 C-G. Phase to phase are even more strange, 215 A-B , 154 A-C and 253 B-C. (steady voltage)
I have tried to draw this out thinking maybe the wye from the XF is connected to one wire from the three phase generators 120 degrees out, "mirroring" each other. Any ideas why I would be getting this odd voltage?
I have already suggested that the owner set his upper limits to 217 volts hoping the generators would drop out if they are just reading each other.
We have a 120/208 YY PMT at a solar farm. The farm has several single phase solar generators connected, and all have dropped out when I removed an elbow, testing single phasing conditions. They recently have added another 300kW of three phase generators that are parallelled in with the single phase generators feeding back onto the "grid".
Now when I remove an elbow ("C" phase) to test a single phasing condition, the generators are still producing voltage, but at a higher voltage than normal. My voltages are 124 A-G, 124 B-G, and 135 C-G. Phase to phase are even more strange, 215 A-B , 154 A-C and 253 B-C. (steady voltage)
I have tried to draw this out thinking maybe the wye from the XF is connected to one wire from the three phase generators 120 degrees out, "mirroring" each other. Any ideas why I would be getting this odd voltage?
I have already suggested that the owner set his upper limits to 217 volts hoping the generators would drop out if they are just reading each other.
