The temperature of GIL equipment is an important technical index to judge whether it is in normal opera-tion. At present

there are few researches on the combination of monitoring temperature signal and identifying opera-tion state. Therefore

this paper establishes a three-dimensional finite element model

which can accurately analyzethe distribution of temperature field under different working conditions. By arranging infrared temperature sensor onGIL line to monitor the actual shell temperature value

a real-time monitoring method is designed in the scheme ofshell temperature

the data is transmitted to the monitoring system wirelessly

and the normal operating shell temper-ature value calculated by simulation is taken as the standard of state identification. The GIL operating state is identi-fied in real time

which is convenient to analyze the GIL temperature state. When the current and environment andother operating conditions are changed

the model parameters can be modified directly

that is

the temperature pa-rameter indexes of normal operation can be obtained

so as to carry out accurate state identification is helpful for thesafe and reliable operation of GIL.