Effectiveness of pre-insertion inductors for mitigating remote overvoltages due to shunt capacitor energization

Pre-insertion inductors have been introduced as a cost-effective alternative to pre-insertion resistors for controlling capacitor bank energization overvoltages. The results of a system study investigating remote overvoltage mitigation methods for shunt capacitor switching show that pre-insertion inductors are not always as effective as pre-insertion resistors. A parametric study is performed to determine the effectiveness of pre-insertion inductors for controlling remote overvoltages, such as those at the end of open-ended lines or transformer-terminated lines. The results show that the pre-insertion inductors used for controlling remote overvoltages may become completely ineffective for certain system conditions. This finding is explained in terms of the physical phenomena.<>