For verifying the switching performance of DC high-speed switch（HSS）after unexpected tripping in Multiterminal HVDC transmission project

the DC arcing test platform for the DC high speed switch is set up in Xi’an High Voltage Apparatus Research Institute Co.

Ltd.（XIHARI）in combination with the actual operation status of the DC high speed switch and

with type ZKLW-550 switchgear as the prototype

the test verification of the DC arc withstanding capability of the DC high speed switch is performed firstly both at home and abroad. The testing results show that type ZKLW-550 switch does not have obvious external effect through 5 times of arcing ablation in total

including DC current of 4 000 A and duration of 400 ms and meets the verification test requirement. In addition

it is founded that during the DC arcing test

the double-break arc voltage of the high speed switch is stable around 1 kV. The ablation at the end of the stationary and the moving arc contacts is serious. The length of stationary arcing contact has been shortened by 1.7 mm and weight is detected to be reduced by 10 g compared with them of the new one. The moving arc contact has been ablated and deformed and cannot be disassembled normally by the tool. The study contents in this paper have some reference for the design of DC arcing test circuit and the application of DC high speed switch in the multi-terminal HVDC projects.