On December 28, a prototype test of a 500 kV HVDC circuit breaker independently developed by China Western Electric Power Western Electric Power System passed the type test, which can cut short circuit fault current of 25 KA in 3 ms to meet the requirements of Zhangbei Project This is a major breakthrough made once again in the field of core equipment of high voltage flexible DC transmission system after the successful development of ± 500kV and ± 800kV flexible DC transmission valves.
Since 2013, based on the state 863 and 973 major science and technology projects, the power system of the West Power has successively developed the principle prototype of the 10 kV and 160 kV DC circuit breakers. On this basis, the Division aimed at the highest voltage level in the world , The largest transmission capacity of renewable energy in Zhangbei flexible DC grid demonstration project, from the DC short-circuit current breaking mechanism, the development of core components, product prototype integration and testing carried out a large number of studies to overcome the DC circuit breaker modeling and simulation, Current fast and reliable transfer, power electronic switch high current shutdown, high potential power supply, control and protection, modular design and other compact integrated technology problems, the successful development of a diode-based full-bridge rectifier cascaded low-loss 500 kV hybrid DC Circuit breaker prototype, and passed the insulation and running tests, the prototype voltage level and current breaking capacity has reached the international advanced level.
The successful development of the 500 kV DC circuit breaker prototype indicates that the West Power System has complete sets of design and equipment supply capability in the research of UHVDC flexible DC transmission engineering systems, converter valves, valve control and DC circuit breakers. The Division has laid a solid foundation for developing flexible DC transmission projects in domestic and overseas markets.