The power factor on the high-voltage side is different from that on the low-voltage side
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The power factor on the high-voltage side is different from that on the low-voltage side: phase A on the high-voltage side shows a value of 0.45–0.75, while phase C shows 0.93. The overall power factor ends up being between 0.75 and 0.91. There is an automatic reactive power compensation device installed on the low-voltage side; the value of 0.85 shown there is it due to three-phase imbalance?
Based on your question, it is powered by a transformer of 10/0.4kV or 6.3/0.4kV. The power factor on the high-voltage side is low because the reactive losses associated with the transformer have to be taken into account; therefore it is lower than that on the low-voltage side. Your high-voltage side certainly lacks reactive power compensation ； The three-phase imbalance in the power factor on the high-voltage side is caused by the three-phase imbalance in the power factor on the low-voltage side, which is reflected on the high-voltage side.
Yes, it’s 10/0.4 KV; no reactive power compensation is installed on the high-voltage side – it’s mainly present on the low-voltage side. Since it’s a distribution transformer, it’s almost always either unloaded or lightly loaded. Where should we look to find the problem?