World's first 363kV/5000A fast vacuum circuit breaker made a breakthrough

[ China Instrument Network Instrument Development ] On August 8, a circuit breaker based on vacuum rapid breaking technology, rated voltage 363kV / rated current 5000A / opening time 1.2ms, developed by State Grid Ningxia Electric Power Co., Ltd., is in Xi'an, Shaanxi. The Electric Apparatus Research Institute successfully passed the breaking test with a short-circuit current of 80kA.

The fast breaking technology of short-circuit current has great practical significance for the safe and stable operation of power grid and equipment. The circuit breaker acts as a bus-coupled circuit breaker, and the busbars run in parallel during normal operation to ensure the reliability of the system operation. When a busbar near-field short-circuit fault occurs, the bus-coupled fast circuit breaker divides the short-circuit current to a lower level in one cycle time. The utility model effectively solves the problem that the busbar short-circuit current exceeds the standard; secondly, the fast circuit breaker quickly cuts off the fault current in a cycle time, greatly improves the stability of the power system, avoids system instability, prevents large-area power outage, and reduces the fault current to the system. Equipment impact and reduce requirements and investment in other grid equipment; Finally, as a new energy station and sensitive load line circuit breakers, quickly remove faulty lines, avoiding other new energy stations, chain off-network and power-sensitive users to stop production or products A large number of scraps to improve the quality of power supply.
It is understood that in 2016, the State Grid Corporation's short-circuit current for ultra-high voltage power grids exceeded the standard seriously, threatening the safety of the power grid and the economic operation status, and issued the key research and development tasks for the “Key Technology Research and Prototype Development of 363kV/5000A/63kA Fast Circuit Breaker”. Power Co., Ltd. took the lead, and Nanrui Group Company, Anhui Huidian Technology Co., Ltd., Xi'an Jiaotong University, Chongqing University and other units participated in the project and was implemented by the State Grid Ningxia Electric Power Co., Ltd. Electric Power Research Institute. The project has developed a fast vacuum circuit breaker that can be used for 363kV voltage level. It is connected with multiple vacuum interrupters in series and parallel, with ultra-fast repulsive mechanism and short-circuit current amplitude and phase fast identification technology to achieve short-circuit current within 20ms. Half-wave zero-crossing) Fast and reliable breaking.
Through project research, mastered the key technologies of fast circuit breaker design and control, which will promote the development of new fast high voltage circuit breaker equipment industry, enhance national independent innovation capability and equipment manufacturing capability, and provide more reliable and intelligent one for smart grid construction. Equipment, greatly improve the ability of the grid to operate safely and stably, with good social and economic benefits and good application prospects.
(Original title: The world's first 363kV/5000A fast vacuum circuit breaker achieved key technical breakthroughs)

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