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 Voltage||kV||12 … 40,5 kV|
|Rated Power Frequency Withstand Voltage||kV||10 … 85 kV|
|Rated Lightning Impulse Withstand Voltage||kV||40 … 185 kV|
|Short-Circuit Breaking Current||kA||16 … 25|
|Short-Time Withstand Current, 1/3s||kA||16 … 25|
|Rated Current||A||200 … 1250|