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)?
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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