Analysis on Electrical Properties of Cold Sprayed Copper Coating on Static Electrical Contact Surface of High Voltage Switch

Abstract

 In order to verify the feasibility of replacing silver layer with cold sprayed copper coating on the static electrical contact surface of high voltage switch，an electronic universal testing machine was used to apply certain pressure on the test samples with surface treatments of silver plating and cold sprayed copper coating，and the contact resistance of such samples was measured by micro-resistance tester，the influence of different surface treatments on the contact resistance of samples was analyzed，and then the temperature rise test of conductors with two different surface treatments was carried out on 252 kV GIL prototype.Results showed that the contact resistance of electrical contact surface with cold sprayed copper coating was lower，and the temperature rise value obtained from the temperature rise test was also lower than that of silver plated electric contact surface，indicating that the cold sprayed copper coating can replace the silver plating treatment on the electrostatic contact surface and reduce the manufacturing cost of high-voltage switch.

Keywords

• electrical contact surface|cold sprayed copper coating|contact resistance|temperature rise test