A Coupling Capacitor Voltage Transformer of Metering Accuracy for SF6 Insulated Compact Substations

The application of metering-accuracy coupling capacitor voltage transformers to SF6 insulated compact substations presents the probleni of initial parameter change due to the enclosure of the coupling capacitor in a ground shield. Additional parameter changes may be caused by operating conditions which impose an unfavorable temperature gradient on the coupling capacitor voltage divider.