Research on the Influencing Factors of Contact Temperature of GIS Disconnect Switch

With the continuous development of China's power industry in recent years, China's power grid construction has developed rapidly in the context of the development of modern society. In this process, Gas Insulated Switchgear (GIS) is used in a wide range. The disconnect switch is the most frequently operated unit in GIS, and during use, the contact surface is constantly worn, resulting in a change in the contact state, which causes the abnormal temperature rise of the GIS disconnect switch. The research on the influencing factors of contact temperature is conducive to the non-invasive monitoring of contact temperature, reducing the failure of GIS disconnect switch and prolonging its service life. In this paper, a simplified model of the GIS disconnector is established, and the multi-field coupling simulation calculation of the electromagnetic-fluid-temperature field of the GIS disconnect switch is carried out, and the effects of contact resistance, ambient temperature and load current on the contact temperature are studied. The results show that the most serious temperature rise is concentrated around the contacts, and the contact temperature has an obvious functional relationship with the contact resistance, the ambient temperature and the load current, among which the contact temperature, the contact resistance and the ambient temperature satisfy the primary function relationship, and the contact temperature and the load current satisfy the quadratic function relationship.