Air pressure control system for high-altitude high-voltage switch electrical box

The invention discloses an air pressure control system of a high-voltage electrical box for high altitude. High-voltage electrical components in a box body of the high-voltage electrical box comprise a high-voltage cable, a vacuum circuit breaker, a high-voltage isolating switch, a mutual inductor, a lightning arrester and the like; an independent air pressure control system is arranged in the box body and comprises a pressure sensor, an electromagnetic valve, a pressure regulating valve, an overflow valve and a connecting pipeline. A train processes data of the pressure sensor and controls on-off of the electromagnetic valve. On the premise of not changing the structures of the traditional high-voltage electrical box and the internal high-voltage components, a set of in-box air pressure control system is additionally arranged, so that the traditional high-voltage electrical box can adapt to a severe environment in a high-altitude area. When the air pressure in the high-pressure tank is higher than the standa