High-Speed DC Switches (HSS) are critical equipment in multi-terminal DC transmission systems, with their ability to withstand DC arc ablation for extended periods being crucial. This paper presents an experimental study of HSS characteristics in ±800 kV hybrid multi-terminal HVDC projects. We constructed a constant current DC high-current test circuit for switching power supplies and conducted long-term ablation tests of HSS DC arcs under operating conditions and product characteristics of HSS. Additionally, we performed DC arc endurance tests on a 500 kV DC switch sample. The results demonstrate that ablation prototypes based on 1% boron nitride nozzle of CuW70 contact, 3% boron nitride nozzle of CuW80 contact, and 5% boron nitride nozzle of CuW85 contact can withstand long arc tolerance conditions of 4000A/5 times/400ms. In the DC arc test, the arc voltage of the two break surfaces of HSS stabilized at approximately 1 kV, and the weight of the static arc contact decreased by 10 g, while the length shortened by 1.7 mm. Finally, based on the results of the DC arc ablation test, we recommend using CuW70 for the static arc contact, CuW80 for the moving arc contact, and adding 3% boron content to the nozzle nitrogen. The research results provide valuable insights for structure optimization and material selection of HSS interrupters.
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