Use of ground protection of energy reducing maintenance switch (ERMS) for protecting controlgears

A ground protection of an energy reducing maintenance switch (ERMS) system for protecting a controlgear, the ground protection of the ERMS system comprising:

• a feeder comprising:
• switchgears comprising a low voltage (LV) switchgear and a medium voltage (MV) switchgear,
• a circuit breaker operatively connected to the switchgears,
• wherein the circuit breaker comprises a trip coil;
• a transformer operatively connected to the circuit breaker, and
• a booster operatively connected to the LV switchgear;
• the controlgear operatively connected to the feeder;
• and
• a microprocessor protection relay, the microprocessor protection relay comprising:
• a built-in ERMS with ground protection,
• wherein the microprocessor protection relay is operatively connected to the circuit breaker and the controlgear,
• wherein the microprocessor protection relay operates the built-in ERMS with ground protection during a pre-flashover phase by energizing the trip coil to activate the circuit breaker,
• wherein, in the pre-flashover phase, a ground fault starts in the controlgear, and
• wherein the circuit breaker operates to interrupt a current to the controlgear before any flashover occurs in the controlgear.