Power Quality Meter CT 180 Degree Phase Shift

Are you trying to wire a 3 phase generator into a split phase supply?

https://www.janitza.com/installation-of-current-transformers.html

No. Its 11kV 3 phase. All measurements are at 11kV.

The 11kV generator is paralleled with the 11kV incomers.

If you reverse all three CT phases (reverse S1 and S2 for all 3 CTs), it will reverse the total power flow indicated.

P = I₁V₁ + I₂V₂ + I₃V₃.

Hi

So to be clear the cts on the bars will remain in situ unchanged. My connections to the current inputs of the PQM will be reversed. The PQM current reading is 180 degrees out of phase at the moment so am I right in thinking 'making this negative' is in effective pulling it back by 180 degrees?

Your theory backs up the reverse power we are seeing.

Yes, reversing the wiring on all three will reverse the power.

Do not remove any connections while there is power on the bus. If the current transformers are not securely connected to the power meter (or shorted together), high voltage will result when the bus is energized.

Hi thanks for getting back.

I'm going to get my electricians onto now to swap the wiring.

Thanks also for the warning of disconnecting energised cts. I'm aware of it but it might help anyone else who reads the thread. Thinking where these cts are located on the switchboard it would be big job to repair + loads of downtime.

cheers