特高压电网继电保护技术的发展

Development of relay protection technology for UHV power grid

特高压电网具有很大的经济效益与技术优势,大系统或者全国统一电网的骨架是由其联合而成,其安全正常的运行对全系统的安全可靠性具有很大的意义。因此,应采取多种措施提高它的动作速度、灵敏性、选择性与可靠度。特高压电网的继电保护同样是建立在继电保护基础原理之上,是在高压与超高压继电保护技术的基础上发展起来的。然而特高压电网中主要设备耐受过电压的裕度较低,因此发生故障时一定要快速可靠地排除故障以防止产生破坏主设备绝缘的过电压。该问题在特高压输电线路中表现的格外突出。对特高压电网继电保护技术进行研究和分析,仅供参考。

UHV grid has great economic benefits and technical advantages.The skeleton of large system or national unified power grid is formed by its combination.Its safe and normal operation has great significance to the safety and reliability of the whole system.Therefore,a variety of measures should be taken to increase its speed,sensitivity,selectivity and reliability.The relay protection of UHV grid is also based on the basic principle of relay protection,which is developed on the basis of high voltage and ultra high voltage relay protection technology.However,the main equipment in the UHV grid is less tolerant of overvoltage,so it is necessary to quickly and reliably eliminate faults in the event of a fault to prevent overvoltages that damage the insulation of the main equipment.This problem is particularly prominent in UHV transmission lines.Research and analysis of UHV grid relay protection technology is for reference only.