Multi-physical Field Model and Measurement Accuracy Error Analysis for DC GIS Resistorcapacitor Voltage Dividers

Resistor-capacitor voltage divider (RCVD), as the main voltage divider used in conventional/flexible DC transmission, DC power grids, new energy grid connection and other projects both domestically and internationally, has the simple principle, reliable component performance and mature technical support. However, the stray capacitance (SC) of RCVD to the ground and the resistance temperature drift (RTD) have had serious impacts on the measurement performance of RCVD, thereby affecting the safety and reliability of the DC power grid. In this paper, with the research approach of "field distribution analysis—stray parameter analysis—field-circuit coupling measurement accuracy analysis", the multi-physics field model of ±550kV DC GIS RCVD is created. The circuit model for measurement accuracy calculation of the RCVD is established, and the influence of electrostatic and thermal field distribution on measurement accuracy is analyzed. This work can indicate the direction for the research on the high-precision RCVD development.