Switch cabinet (switch cabinet) is a kind of electrical equipment, switch cabinet outside the line first into the cabinet main control switch, and then into the sub-control switch, each subway according to its needs. Such as instrumentation, automatic control, motor magnetic switch, a variety of AC contactors, etc., some also set up a high-pressure room and low-pressure room switchgear, with a high-voltage bus, such as power plants, etc., and some also have a low-week load-shedding for the protection of major equipment. Switchgear (switchgear) is the main role in the power system for power generation, transmission, distribution and power conversion process, open and close, control and protection of electrical equipment. Switchgear components are mainly circuit breakers, disconnecting switches, load switches, operating mechanisms, transformers and insulation components of the protection device and other components. The insulating components serve to support, load-bearing, isolation and other requirements, so the insulating materials are required to be: higher electrical strength, higher mechanical strength, more arc-resistant and so on. Commonly used GPO3

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