METHOD AND SYSTEM FOR EARLY WARNING INTERNAL HEATING OF ISOLATION SWITCH OF GIS

Provided are a method and system for early warning internal heating of an isolation switch of a GIS. The heating early warning method includes the following: acquiring (S11) a gas temperature and an original absolute pressure inside an isolation switch of at least one GIS, 5 an ambient temperature and a three-phase load current of the isolation switch; calculating (S21) multiple characteristic amounts of a pressure according to the original absolute pressure, the ambient temperature, the gas temperature and the three-phase load current, where the multiple characteristic amounts of the pressure include a month-over-month growth amount, a month-over-month growth rate, a year-over-year growth amount, a [0 year-over-year growth rate, a difference amount between phases, a difference rate between the phases, a growth amount compared with an adjacent air chamber and a growth rate compared with the adjacent air chamber; performing severe heating abnormality determination, which includes the following: if an abnormal condition is met, sending (S31) an early warning signal of a severe heating defect; determining a correlation between the [5 original absolute pressure and the ambient temperature includes: if the original absolute pressure and the ambient temperature are correlated, calculating an ambient compensation pressure after the ambient temperature is compensated, and recalculating the multiple characteristic amounts of the pressure by using the ambient compensation pressure; if the original absolute pressure and the ambient temperature are not correlated, determining a 20 correlation between the pressure and the three-phase load current; if the pressure and the three-phase load current are not correlated, performing (S41) general heating abnormality determination, which includes: if an abnormal condition is met, sending (S51) an early warning signal of a general heating defect.