go to the Gas-insulated switchgear product page Chirag P asked on Feb 4th, 2015 in Gas-insulated switchgear

Why is direct current (DC) used in gas-insulated switchgear (GIS) for drive mechanism operation for circuit breaker, disconnectors and earthing switch?

Why is DC generally recommended for motor drive operation in GIS instead of AC, while in air insulated switchgear, the motor drive operates on alternating current (AC)?

Olav Knudsen , Principal Engineer, Gas-insulated switchgear

ABB's answer

Most GIS users connect the drives for circuit breaker, disconnectors, and earthing switches to the station’s uninterruptible power supply or DC battery supply enable operations of the switchgear during grid restoration. Others connect the drives to AC and operate just the protection relays from the station battery. Consequently, DC supplies are the most frequent choice. AC supply options are also available. 

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  • Olav Knudsen

    Olav Knudsen

    Principal Engineer, Gas-insulated switchgear

    High Voltage Products

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