The temperature rise characteristics of three types of discharge coils under three conditions are compared based on the temperature rise tests discharge coils with rated load

temperature rise test of second short-circuit of rated voltage and temperature rise test of discharge of rated power.The temperature rise situation of coils in short circuit test and discharge test is analyzed by theoretical calculation

showing that the calculation and test results are in agreement.Moreover

the temperature rise status of coils at sustaining discharge test of rated power of the discharge coil is studied in this paper

showing in the result that the transient temperature of discharge coils rises with high speed in the sustaining discharge test.Therefore

in the control of shunt capacitor switching with VQC at substation

the time interval of operation of the capacitor bank should be controlled to prevent damage of coils due to excessive high transient temperature caused by sustaining switching of capacitor and sustaining discharge of discharge coils.