基于耦合负压原理的10kV直流负荷开关设计OA北大核心CSTPCD

For meeting the requirements of frequent switching of load current of flexible DC power distribution sys-tem to the operation life of switchgear and solving the difficulty of high cost and large volume due to the direct use of DC circuit breaker,a kind of DC load switch scheme based on couple negative voltage principle is studied in this pa-per.Firstly,its topology and working principle are introduced.Then,the fast mechanical switch in the main branch based on double-acting structure and electromagnetic repulsion mechanism,the converter unit based on the coupled negative voltage device and the power electronic valve unit using the anti-series topology,are designed respectively.Finally,according to the engineering requirements of a converter station in Suzhou,a 10 kV coupled negative voltage DC load switch prototype is developed and verified by tests.The result shows that the developed 10 kV DC load switch can frequently interrupt the rated current and the maximum breaking current within 3 ms,the volume at pres-ent is the smallest with the same parameters in China,and it has the advantages of low loss,high mechanical life and reliability.It fully satisfies the engineering requirements and,at the same time,provides a reference for the develop-ment of subsequent DC load switch products.