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A switchgear may be a simple open-air isolator switch or it may be insulated by some other substance. An effective although more costly form of switchgear is the gas-insulated switchgear (GIS), where the conductors and contacts are insulated by pressurized sulfur hexafluoride gas (SF 6). Other common types are oil or vacuum insulated switchgear.
Floors may be reinforced to support heavy transformers and switchgear. Walls and ceilings may have to support a heavy cable tray system or busbars. Additional ventilation or air conditioning may be needed, since electrical apparatus gives off heat but the temperature must not rise beyond the tolerance of equipment.
High-voltage switchgear is any switchgear used to connect or disconnect a part of a high-voltage power system. This equipment is essential for the protection and safe operation, without interruption, of a high voltage power system, and is important because it is directly linked to the quality of the electricity supply.
Since the arc is contained within the interrupter, switchgear using vacuum interrupters are very compact compared with switchgear using air, sulfur hexafluoride (SF 6) or oil as arc-suppression medium. Vacuum interrupters can be used for circuit-breakers and load switches.
A low-voltage switchboard A modern electric switchboard. An electric switchboard is a piece of equipment that distributes electric power from one or more sources of supply to several smaller load circuits. It is an assembly of one or more panels, each of which contains switching devices for the protection and control of circuits fed from the ...
The demand for medium voltage air insulated switchgear (AIS) is increasing due to its cost-effectiveness, reliability, and suitability for diverse applications. Medium voltage AIS systems, typically rated between 1 kV and 36 kV, are essential for power distribution in industrial, commercial, and utility sectors.
In the larger current ratings, dry air is forced through the enclosures and within the tubular conductors for forced-air cooling of the conductors. The cooling air is recirculated through a heat exchanger. Some items of switchgear, such as circuit breakers and isolating switches, are made in housings compatible with the isolated-phase bus ...
Vacuum is a better insulator than air but less than gas or oil. Vacuum circuit breakers (VCB) are smaller than air circuit breakers and are commonly used in distribution and other switchgear under 35kv. [42] Mixed, including both gas and air insulation.
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