Standard EMI filters fail catastrophically during breaker operations as common mode chokes become useless ballast in ungrounded DC networks. Switching surges reach 5-10 kV while standard varistors allow thousands of volts potential during 6 kA faults. New protective modules maintain 520 V clamping with zero ground leakage. This is critical for preventing digital relay failures in substations.
Isolated DC surge hardening
The Problem of Increasing the Electromagnetic Immunity of the Electronic Equipment of Substations Powered from an Ungrounded DC Auxiliary Network
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