Design construction and testing of high voltage (HV) flameproof electric motors for hydrogen explosive atmosphere (IIC) case studies

Explosion proof motors play vital role in safe operation of industries associated with explosive gas dusts and chemicals of all categories and hence deserve special attention. Flameproof (Ex’d’) electric motors are used in hazardous areas like refineries, petrochemical, underground coalmines and oil mines installed in Zone I and II, Hydrogen is being used as a process gas in various refineries, thereby increasing the demand of Ex ‘d’ motors for Gas Group IIC area. High voltage (HV) Ex ‘d’ IIC motors are being manufactured for the first time in India. Earlier such motors were imported. These motors are tested in CMRI for explosion proof. Case studies were made on three different HV motors and the data presented. The paper shows that it is not difficult for other manufactures to come out with such design, witch may be found to be suitable for Gas Group IIC atmosphere. CMRI leads in testing of these motors. HV motors play an important role in the economy of India and are also being exported to different countries