1100 kV/10 kA特高压交流长期带电试验回路的设计

Design of 1100 kV/10 kA UHV AC long term live test loop

特高压交流开关设备和套管在全寿命周期内的可靠性问题一直是电网公司和设备制造厂关注的重点问题。开展长期带电试验研究是保证电网安全稳定运行的关键。文中简要介绍了西安高压电器研究院(XIHARI)常州交流长期带电试验场的布置和主要试验设备技术参数选型依据。重点对电流回路阻抗、升流装置容量及辅助接地网阻抗进行了计算。由于1 100 k V/10 k A升流装置的气体绝缘金属封闭外壳无外部回流通道,因而为其设计了特殊的辅助铜排接地网并对回路的有功损耗、端电压进行了计算和验证。此外,考虑到项目所在地属于中雷区,文中还设计了由5支独立接闪器组成的防雷保护系统,提高了试验设备和试品的雷击保护水平。

The reliability of ultra-high-voltage (UHV) alternating current (AC) switch-gear and bushing during its whole life cycle has always been a major concern of Power Grid Corporation and manufacturers. The study of long term live test is the key to ensure safe and stable operation of bulk power grid. In this paper, the layout of test field, the technical parameters of main test equipment, impedance calculation of the 1 100 kV/10 kA test loop and the design of auxiliary grounding grid are described in detail. As the gas-insulated switch-gear (GIS) enclosure of 1 100 kV/10 kA power current transformer (power CT) has no external circulating channel, a special copper bar grounding grid is designed to form a complete loop. Its active power consumption, terminal voltage are calculated and verified. Meanwhile, considering that the project is located in the middle thunderstorm region, this paper designs a lightning protection system, which improved the lightning protection level of the test equipment and test object.