Just to put you all in the picture, I did what I suggested to the contractor, in the first place, and changed the phasing at the 11kV line into the switchgear. This remedied the situation. If my suggestion had been heeded we would not be talking now.
Further to my puzzle!!
1. The measurement (phase rotation) at the 11kV side was taken on the secondary of the line VT and again at the busbar VT. This was to confirm that the wiring from the VTs (although verified earlier) was correct.
2. The measurement (phase rotation) was rechecked using...
Can somenone verify this please - A 20kV/11kV 15MVA, YNd11 trasnformer is connected between a 20kV network and an 11kV switchboard. On checking the phase rotation at the 11kV switchboard it was found to be counter-clockwise. This was also the case on the 20kV side, which I suspected, due to some...
