In the world's first five-terminal flexible DC transmission project - Zhoushan soft straight engineering Zhouding converter station, the world's first high-voltage DC circuit breaker was installed and successfully completed the on-site handover test, which will provide stable operation for Zhoushan multi-end soft and straight system. Strong protection.
The high-voltage DC circuit breaker of Zhouding Converter Station adopts ±200 kV cascaded full-bridge hybrid DC circuit breaker. The DC circuit breaker compensates for the high loss of the solid-state DC circuit breaker, overcomes the problem of the switching speed limitation of the mechanical circuit breaker, and realizes the modular design of the electrical and mechanical structure. According to field experts, in the test, the DC circuit breaker can disconnect the fault current of up to 15 kA in 3 milliseconds, which is 100 times faster than the moment of human blink. In the current global circuit breaker, the voltage level is the highest, breaking. The most capable.
As the world's first five-terminal flexible DC transmission project, the Zhoushan multi-terminal flexible DC transmission project put into operation on July 4, 2014 has set up a DC interconnection grid for Zhoushan Island. However, the flexible DC transmission system can not achieve the rapid removal of DC faults. For this reason, the company launched the "Zhoushan Flexible System DC Circuit Breaker and Damping Recovery Technology Demonstration Project" in May this year to provide solutions for breaking the technical bottleneck faced by the flexible system. .
Because it is the world's first such high-profile DC circuit breaker, there is no ready-made installation experience to learn from, and the installation work is very difficult. In the first half of this year, Zhoushan Power Supply Company dispatched fine soldiers and deployed circuit breaker installation planning in advance, and maintained close communication with manufacturers and Zhejiang Electric Power Design Institute. They were familiar with the working characteristics and installation conditions of DC circuit breakers. At the same time, combined with the actual installation work, a new installation method was designed, which accumulated valuable experience for the installation technology of high-voltage DC circuit breaker.
Next, the technician will perform various types of debugging on the DC-DC circuit breaker to prepare for the final commissioning.
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