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Compact substation, also known as prefabricated substation, is a kind of indoor and outdoor compact distribution equipment. It combines the high voltage switch equipment, distribution transformers and low voltage power distribution equipment together in a certain wiring schemes, installed in a steel structure which is moisture, rust, dust, rat, fire prevention, guard against theft, thermal insulation, fully enclosed and movable. It is suitable for mines, factories, oil and gas fields and wind power stations. It replaces the original civil distribution house and power station and becomes a new complete set of transformer and distribution equipment.
The compact substation is mainly divided into three parts: high voltage switchgear, transformer and low voltage switchgear.
According to the needs of the system, HV switchgear can choose sulfur hexafluoride (SF6) or vacuum circuit breaker, ring network switch, load break switch and fuse.The high voltage side can also be installed with metering devices. The low voltage side is generally installed with main switch and branch feeder switch, but some only install feeder switch. Feed directly to the low voltage end user. In addition, compensation capacitors and metering devices also can be installed. Distribution transformers generally choose oil-immersed or dry type transformers.

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