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Metal-Enclosed (Air Insulated / Secondary)

Metal-Enclosed (Air Insulated / Secondary)

In an electricity distribution grid, Metal-Enclosed Switchgears are factory assembled, metal enclosed set of switchgear used at the load connection points of either ring-type or radial distribution networks. It has many different options of functional units; namely transformer protection units (with fıse or circuit breaker -SF6 or Vacuum), metering unit, coupling unit, etc.

Air Insulated Metal-Enclosed Switchgears can be characterized by their type of insulation which is air. The switch used to isolate the transformer can be a fusible switch, or may be a circuit breaker using vacuum or gas-insulated interrupters. The unit may also include protective relays to operate the circuit breaker on a fault.

Rated VoltagekV12 … 40,5 kV
FrequencyHz50/60
Rated Power Frequency Withstand VoltagekV10 … 85 kV
Rated Lightning Impulse Withstand VoltagekV40 … 185 kV
Short-Circuit Breaking CurrentkA16 … 25
Short-Time Withstand Current, 1/3skA16 … 25
Rated Current A200 … 1250