High Voltage Switchgear is a key component in the power system, with the characteristics of high reliability, strong arc extinguishing ability and fast response, which can safely cut off or connect high-voltage circuits and withstand short-circuit current shocks. Its casing is usually made of high-strength metal (such as aluminum alloy or stainless steel) or insulating material (such as epoxy resin), and the internal contacts are mostly made of arc-resistant and conductive copper-tungsten alloy or silver-plated copper. The insulation part uses ceramics, silicone rubber and other high-temperature resistant and anti-aging media. This type of equipment is widely used in substations, power plants, industrial and mining enterprises and urban distribution networks, and undertakes circuit protection, control and isolation functions. It is suitable for medium and high voltage power systems with a rated voltage of more than 10kV to ensure stable operation of the power grid and rapid fault removal. It also has important applications in new energy fields (such as wind power, photovoltaic booster stations) and rail transit scenarios.