Series capacitor protection equpment with extended range dual sparkover feature

摘要

Where multiple bypass circuits are provided across the protected equipment and have different sensitivity to overvoltages, the more sensitive trigger gap circuit branch is coupled to the high voltage main spark gap by means including a pulse transformer to boost the voltage across the main gap rapidly upon firing of the trigger gap so that the trigger gap can be at a highly sensitive overvoltage level to minimize further any danger of transient mechanical subsynchronous shocks to the rotating shafts of large generators in a transmission system, while retaining the ability of delayed reclosing of the trigger gap branch following its operation to immunize it against post reinsertion transient voltages.