Current standard of inclined plane tracking test only concerns the condition under AC voltage.To understand the influence of DC voltage on erosion of silicon rubber in DC inclined plane tracking test

high speed camera and infrared thermography were used to observe arc discharge phenomena and temperature distribution on silicone rubber in contaminated fluid with a flow rate of 0.2 m L/min. The leakage current

mass loss and maximum erosion depth of the sample were recorded under different test voltage. Results show that incremental test voltage increases the length of arc and reduces the accumulated discharge time

the mass loss

and the maximum erosion depth. Although the increase of test voltage enlarges the erosion area

the test severity weakens since the discharge time is reduced.