Optimization of opening and closing test circuit for back-to-back capacitor bank in high voltage and large capacity laboratory

In the power grid, when the high-voltage circuit breaker frequently operates the switching capacitor bank, the recovery voltage is high and the time is long, which poses a serious threat to the grid device and system insulation, especially when the back-to-back parallel capacitor bank is broken. Because the high-voltage circuit breaker is suitable for the back-to-back capacitor group test, the test voltage is high and the capacitor bank has a large capacity. Therefore, the test parameters of the conventional large-capacity short-circuit experimental station are difficult to meet the requirements of the standard for the inrush current frequency and peak value.