Development and Characteristic Test of a 500kV Wideband Highvoltage Divider

A 500kV wide-band high-voltage divider for transient overvoltage measurement was developed. To improve the accuracy of the overvoltage measuement, the high-voltage arm of the developed voltage divider is based on a standard capacitor. By arranging equalizing electrodes reasonably inside the standard capacitor, the field strength distribution inside the voltage divider is optimized, and the overall size of the voltage divider is reduced. In order to optimize the dynamic performance of the voltage divider, it is equipped with excellent low-voltage arm components. The consistency of scale factor under AC voltage and impulse voltage for the divider is good. It can measure AC voltage with linearity of 0.2
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under 500kV and measure lightning impulse voltage with linearity of 3
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under 1200kV. The difference between AC voltage scale factor and impulse voltage scale factor is less than 0.01%. It can be used to measure transient overvoltage in substation and calibrate the noncontact transient voltage sensor and electric field sensor for field test.