A Reference Resistive Voltage Divider for Switching Impulses

Reference voltage dividers are essential for ensuring measurement accuracy of high voltage tests, including tests with high-voltage switching impulses. This paper describes the design and performance of a portable reference resistive voltage divider for the switching impulse voltage with a rated voltage of 400 kV. This design uses discrete resistor elements for the high voltage arm, which allows easier and more compact construction than a single bifilar wire-wound high-voltage resistor. The modular design allows convenient assembling and disassembling of the divider for transport and on-site calibrations. The high-voltage arm resistors are housed in a sealed cylindrical tube filled with low-pressure SF6 gas to avoid discharge from the surfaces of resistor elements. A damping resistor is…