AIR-DISCONNECT AND GROUND SWITCHES
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NEPSI’s power capacitor banks can be equipped with one or more externally operated air-disconnect switches and ground switches for the purpose of isolation and grounding. The switches are designed and manufactured by reputable suppliers in accordance with ANSI, IEC, CSA, and UL standards.
Note: Air-disconnect switches are not designed, rated, or tested for capacitor switching duty. Capacitor switches or breakers shall perform this operation and shall be interlocked with the air-disconnect switch. Under no circumstances should an air-disconnect switch be operated while carrying capacitive load current.
Depending on their location, the switches provide different functions, as follows:
Incoming Compartment - When located in the incoming compartment, the air-disconnect switch provides a “visible break” or isolation for the entire power capacitor bank, allowing for safe access to all stages.
Stage Compartment - When located in a stage compartment, the air-disconnect switch isolates a single stage of a multi-stage capacitor bank, allowing for partial bank operation during maintenance.
Incoming Compartment - When located in the incoming compartment, the ground switch connects the load-side terminals of the air-disconnect switch (or incoming cables) to ground. This switch location ensures the entire capacitor bank remains grounded and cannot inadvertently become energized.
Stage Compartment - When located in a stage compartment, the ground switch is typically provided to ground the capacitor terminals to ensure all trapped charge has been removed from the capacitors. For ungrounded banks, a 4-pole ground switch can be provided (3-phase poles + 1 Neutral pole).
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