Positive-pressure anti-corrosion protection method for electrical cabinet for transformer substation

A positive-pressure cabinet body is included, and an outer cylinder is fixedly installed in the middle of the top end of the positive-pressure cabinet body. By arranging the trigger, if the internal air pressure of the positive pressure cabinet body is smaller than the internal air pressure, due to the action of pressure intensity, external air pressure drives a limiting block and a pressing rod to press downwards, after a limiting groove presses downwards, a sealing film is extruded, meanwhile, an ejector rod is propped to descend, after the ejector rod descends, the bottom end of the ejector rod presses the trigger, and the trigger can immediately control an electromagnetic air inlet valve to be opened; then gas in external pressure supply equipment is injected into the positive pressure cabinet body, when the air pressure in the positive pressure cabinet body is larger than the external air pressure, the sealing film can drive the limiting block and the pressing rod to ascend, meanwhile, the spring can con