Good day.
I have an arc transformer (42 MVA, 13,2 kV / 557 V). The high voltage winding in near the core and the low volgate winding is over it.
3 years ago the power factor was:
1. AT 0,59 AT VS EARTH + AT VS BT
2. AT GST 0,63 AT VS EARTH
3. AT-BT (UST) 0,56 AT VS BT
4. BT...