摘要
如何在故障发生时最大限度保护运行人员人身安全,减少设备的损害是电力系统保护工程师重点关注的问题。文章总结了过去10多年来在中国变电站中低压配电领域内电弧光保护的应用和运行经验,并结合最新发布的电力行业标准和即将发布的国家标准,讨论电弧光保护的配置、应用和关键点。电弧光保护技术可以作为中低压开关母线主保护的一种新选择,因其动作速度快、灵活性高、可靠性高及选择性灵活的特点而被广泛应用,并且具有很高的性价比。在中国绝大部分中低压母线没有主保护的情况下,尤其是针对加装母线保护的技改项目,电弧光保护具有无可比拟的简单方便的优势。
Minimizing the operational personnel＇ s injury and the damage to the power equipment when an arc flash fault occurs in a MV/LV switchboard has always been a major concern to the utilities protection engineers. This paper summarized the last lO years application and operational experiences of arc protection in MV/switchboards of substations in China. The different aspects of power distribution configuration and applications are discussed in relation to the arc protection. Key protection issues, such as recommendations of current and light settings, reliability of the light sensors, selectivity of the arc protection relays, the pros and cons of the arc protection relays in comparison with the traditional busbar differential protection relays, etc. are also discussed. Finally, two successful arc protection operations are reported and discussed. The paper concludes that as an alternative protection to the busbar differential protection, the arc protection relay can be cost effectively and widely used in the MV/LV switchboards of substations with high speed, flexibility, reliability and selectivity. Particularly the arc protection relays are suitable for retrofitting of existing MV/LV switchboards of the substations where no busbar main protection has been installed in almost all the MV switchboard of the substations in China.
出处
《供用电》
2016年第12期47-53,57,共8页
Distribution & Utilization
