Technical breakthrough in 363kV/5000A fast vacuum circuit breaker Source: National Grid News Author: Reporter correspondent Huang Yongning Guo Wenying On August 8th, the circuit breaker based on vacuum rapid breaking technology and rated voltage 363kV/rated current 5000A/opening time 1.2ms developed by State Grid Ningxia Electric Power Co., Ltd. successfully passed the Xi'an High Voltage Apparatus Research Institute. The short-circuit current is a breaking test of 80 kA. 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. To solve the problem that the busbar short-circuit current exceeds the standard; the fast circuit breaker quickly cuts off the fault current in a cycle time, which can greatly improve the stability of the power system, avoid system instability, prevent large-area power outage, and reduce the impact of fault current on system equipment. And reduce the requirements and investment of other power grid equipment; as a new energy station and sensitive load line circuit breaker, quickly remove the faulty line, can avoid other new energy field station chain off-network and power sensitive users stop production or product scrapped, improve Power quality of power supply. It is understood that in 2016, the State Grid Corporation issued the key research and development tasks of “Key Technology Research and Prototype Development of 363kV/5000A/63kA Fast Circuit Breakerâ€, which was led by State Grid Ningxia Power Co., Ltd., and the units of Nanrui Group Co., Ltd. participated in Ningxia Institute of Electric Power implementation. The project can be used for fast vacuum circuit breakers with 363kV voltage level. It can be connected in series and parallel with multiple vacuum interrupters, with ultra-fast repulsive mechanism and short-circuit current amplitude and phase fast identification technology to achieve short-circuit current within 20ms (first half-wave zero-crossing) ) Fast and reliable breaking. Through project research, State Grid Ningxia Electric Power has mastered the key technologies of design and control of fast circuit breakers, which is conducive to improving the safe and stable operation capability of power grids and promoting the development of new fast high voltage circuit breaker equipment industry. It has good social and economic benefits and popularization and application prospects. .
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