1. Oil Discharge Valve and Nitrogen Injection Valve electromagnet starting circuit are connected in series on both sides of the starting circuit with starting conditions. The starting circuit of the electromagnet is closed to avoid single contact starting the direct outlet. The starting circuit of oil discharge and nitrogen injection electromagnet is not electrified in daily operation, effective prevention of misoperation caused by single relay action. 2. The oil discharge Hammer electromagnet adopts double electromagnet supporting structure, the oil discharge electromagnet and the anti-misoperation electromagnet are controlled by two independent control loops respectively, only after the anti-misoperation electromagnet is started, the oil discharge electromagnet moves, heavy Hammer to drop open drain valve; 3, Drain Oil Nitrogen injection start (trigger) power should be greater than 220V × 3A (DC) , drain oil and Nitrogen Injection Valve Action Coil power should be greater than 220V × 3A (DC) , improve operation reliability. The control cabinet is equipped with a dual power switch system to ensure that the device is always in working condition. 5. A mechanical interlock device is arranged between the oil discharge mechanism and the nitrogen injection mechanism to ensure that the device first discharges oil and then injects nitrogen to prevent misoperation of the device; 6. The nitrogen cylinder driving device adopts explosion-proof self-sealing cylinder head Valve, which has strong anti-interference ability and good sealing performance, 7, nitrogen injection pipeline using stainless steel pipe, compared with metal hose, long life, corrosion resistance and high temperature performance. 8. The nitrogen injection pipeline is provided with an exhaust component which can discharge the leaking nitrogen gas to prevent the nitrogen gas from leaking into the transformer body and causing the light gas to operate frequently. 9. The oil discharge pipeline under the oil discharge valve is provided with the oil leakage observation and the oil leakage alarm device to prevent the oil leakage of the oil discharge pipeline from causing the gas relay to operate. 10. An inspection valve is arranged on the oil discharge pipeline, and an anti-maloperation locking device is arranged. The company has perfect process control and product inspection measures, with electric fast transient pulse group, surge generator, high and low temperature aging laboratory and other test equipment, can regularly test the product Electromagnetic compatibility, ensure the device quality and reliability. 11. The device can extend black box, cloud platform data query transmission and other functions.