High voltage electrical appliances are devices used in high-voltage circuits to achieve closing, breaking, protection, control, regulation, and measurement. General high-voltage electrical appliances include switching appliances, measuring appliances, and current limiting and voltage limiting appliances. The internationally recognized boundary for high and low voltage electrical appliances is 1kV AC (1500V DC). For AC, high voltage electrical appliances above 1kV, and low voltage electrical appliances below 1kV. Sometimes transformers are also included in high-voltage electrical appliances. In high-voltage electrical product samples, drawings, technical documents, factory inspection reports, type test reports, user manuals, and product nameplates, various professional terms are often used to represent the structural characteristics, technical performance, and usage environment of the product. Understanding and mastering these terminology can bring many conveniences to work. Now, we will introduce the commonly used terminology for high-voltage electrical appliances. 1. High voltage switch - Electrical appliances with a rated voltage of 1kV or above mainly used for breaking and closing conductive circuits. 2. High voltage switchgear - The general term for the connection between high voltage switches, control, measurement, protection, regulation devices, auxiliary components, casings, and supporting components, as well as their electrical and mechanical connections. 3. Indoor high-voltage switchgear - High voltage switchgear that does not have wind, rain, snow, ice, and thick frost resistance, and is suitable for installation in building locations. 4. Outdoor high-voltage switchgear - It can withstand the effects of wind, rain, snow, dirt, condensation, ice, and thick frost, and is suitable for installation in outdoor use. 5. Metal enclosed switchgear; Switch cabinet - a switchgear that is completely enclosed by a grounded metal casing, except for the incoming and outgoing lines. 6. Armored metal enclosed switchgear - a metal enclosed switchgear whose main components (such as circuit breakers, transformers, busbars, etc.) are installed in compartments separated by grounded metal partitions
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