Study on a New Power Frequency Capacitive Voltage Transducer for Gas Insulated Substations Based on Capacitive Voltage Division

The IVT for power frequency is an essential facility in the power system. Due to the requirement for high-voltage insulation, the sensing part of the conventional IVTs is bulky and costly. The purpose of this article is to propose a new voltage measurement method based on capacitive voltage divider for GIS. The equivalent circuit of the measurement method is built. The numerical simulation model for the measurement system is built based on the actual size of GIS with rated voltage of 220 kV. And FEM is employed to analyze the transfer relation and the accuracy of the proposed measurement method. The experiments are conducted in the laboratory and at an actual GIS platform, respectively. The transfer relation between the applied voltage and the induced voltage is obtained. Compared with conventional IVTs, the dimension of the measurement system is very small. Due to the low voltage of the sensing part, the insulation problem of the sensing part is avoided. And due to simple structure and linear characteristics, the transfer relation of the proposed measurement system can be obtained with high accuracy.