Air Insulated Metal Enclosed Switchgears

January 30, 20230

Air Insulated Metal Enclosed Switchgears

Medium voltage switchgears are electrical devices that are used to control, protect, and isolate electrical equipment in medium voltage (MV) power systems. MV power systems are typically defined as systems that operate at voltage levels ranging from 1 kV to 52 kV. Switchgears that are designed for use in MV power systems are typically rated for voltage levels up to 36 kV. They are used in a variety of applications, including power generation, transmission, and distribution. They are typically used to control and protect electrical equipment such as transformers, motors, and generators. There are several types of medium voltage switchgears, including air-insulated switchgears (AIS), gas-insulated switchgears (GIS).

Air insulated metal enclosed switchgears (AIS) are types of electrical switchgears that are typically used in indoor applications and are characterized by their use of air as an insulating medium and a metal enclosure to protect the electrical components within the switchgear. With voltage ratings of up to 36kV they are used to control, protect, and isolate electrical equipment in medium voltage (MV) power systems.

How are AIS Metal Enclosed Switchgears Structured? 

AIS metal enclosed switchgears typically consist of a metal enclosure that houses the electrical components of the switchgear, including circuit breakers, busbars, measurement transformers, digital protection relay and other components. The metal enclosure is typically sealed to protect the electrical components from the elements and to prevent accidents. A disconnector, a circuit breaker and a measurement transformer are mounted in the MV compartment according to the switchgear type. A digital relay, a meter (if needed), a cam switch and miniature circuit breakers etc. are mounted in the LV compartment located on top the switchgear.

AIS switchgears are typically equipped with protective devices, such as fuses and circuit breakers, which help to prevent overheating and damage to the electrical equipment they are used to protect. They are also typically equipped with monitoring and control devices, such as meters and relays, which help to ensure that the electrical equipment is operating safely and efficiently. Insulation materials of the circuit breaker inside the switchgear could be SF6 gas or vacuum.

What are the Types of Switchgears?

They are typically less expensive and easier to install and maintain than other types of switchgears, such as gas-insulated switchgears (GIS). In general, most of used metal enclosed switchgear types are listed below.

  • Incoming and outgoing switchgear with load break
  • Incoming and outgoing switchgear with circuit breaker
  • Transformer protection switchgear with fuses
  • Current and voltage measurement switchgear
  • Coupling switchgear
  • Cable connection switchgear

VEKMAR is the official distributor of Schneider Electric, Eaton, Astor, and Armtek for air insulated metal enclosed switchgears. Reach out to us today and get a commercial & technical offer for all your AIS metal enclosed switchgears needs from our experienced team.

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