Abstract:

Accurately mastering the thermal distribution and temperature rise of the current carrying circuit inside the switchgear under operating conditions can avoid the deterioration of insulation performance and reduction of service life under high temperature conditions. The thermal analysis and temperature prediction of a 12 kV switchgear current-carrying circuit are studied. Firstly, the temperature analysis model is established for the key heating parts of the cabinet and the main current-carrying loop. The simulation analysis of the model is carried out in combination with the heating theory of electrical appliances and the heat transfer theory. The results show that the temperature distribution of current-carrying loop is related to the contact resistance. Secondly, based on the simulation dataset, a temperature prediction model is constructed using the least squares support vector machine algorithm to predict the contact temperature. The results show that the prediction model had accuracy within an acceptable prediction error range.

Key words: switchgear, temperature field, temperature prediction, least squares support vector machine (LS-SVM)