Voltage regulators connected wye 7200, the transformer wye is hooked to a grounding resistors 450 ohms. The voltage regulator source load or neutral bushing is connect to the transformer xo lead going to the resistor. The regulator tank is connected to the substation ground grid. First complaint voltage was at 170 volts from regulator for 70 hours. Then regulator failed has failed twice in 30 days 889 KVA. I don’t see how we have have to different grounds going to the regulators.
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