华东地区地貌复杂,线路下树、竹木众多,线路高阻接地事故时有发生。2013年8月5日某500 k V线路单相对树木放电(高阻接地)时,出现3条500 k V线路失电的现象。通过分析认为:阻抗继电器对高阻接地时灵敏度较差,不能可靠动作。500 k V线路...华东地区地貌复杂,线路下树、竹木众多,线路高阻接地事故时有发生。2013年8月5日某500 k V线路单相对树木放电(高阻接地)时,出现3条500 k V线路失电的现象。通过分析认为:阻抗继电器对高阻接地时灵敏度较差,不能可靠动作。500 k V线路继电保护配置时必须充分考虑高阻接地故障时用电流型保护作为主保护及各保护配合问题。展开更多
The protection of distribution networks is facing new challenges from an increasing amount of DG （distributed generation）. Even though current technology provides satisfactory solutions to manage this new situation,...The protection of distribution networks is facing new challenges from an increasing amount of DG （distributed generation）. Even though current technology provides satisfactory solutions to manage this new situation, LOM （loss-of-mains protection） is still considered problematic. The solution proposed in this paper focuses on the use of a line differential protection relay. It inherently contains a suitable communication channel and provides absolutely selective protection for the feeder. Furthermore, it prevents the feeder relays from false tripping for faults on the neighboring feeder. The present trend in protection communication points towards the use of fiber optics. For line differential protection, this means a fast and high-capacity communication link which enables the implementation of many advanced protection functions. In addition, a solid foundation for such a communication link is offered by the new IEC 61850 standard and Ethernet technologies. The basic functionality of the line differential protection enables the operation of both the feeder protection and the DG protection for any fault on the feeder. Furthermore, basic LOM protection methods can be applied as backup protection for failures on the communication link.展开更多
文摘华东地区地貌复杂,线路下树、竹木众多,线路高阻接地事故时有发生。2013年8月5日某500 k V线路单相对树木放电(高阻接地)时,出现3条500 k V线路失电的现象。通过分析认为:阻抗继电器对高阻接地时灵敏度较差,不能可靠动作。500 k V线路继电保护配置时必须充分考虑高阻接地故障时用电流型保护作为主保护及各保护配合问题。
文摘The protection of distribution networks is facing new challenges from an increasing amount of DG （distributed generation）. Even though current technology provides satisfactory solutions to manage this new situation, LOM （loss-of-mains protection） is still considered problematic. The solution proposed in this paper focuses on the use of a line differential protection relay. It inherently contains a suitable communication channel and provides absolutely selective protection for the feeder. Furthermore, it prevents the feeder relays from false tripping for faults on the neighboring feeder. The present trend in protection communication points towards the use of fiber optics. For line differential protection, this means a fast and high-capacity communication link which enables the implementation of many advanced protection functions. In addition, a solid foundation for such a communication link is offered by the new IEC 61850 standard and Ethernet technologies. The basic functionality of the line differential protection enables the operation of both the feeder protection and the DG protection for any fault on the feeder. Furthermore, basic LOM protection methods can be applied as backup protection for failures on the communication link.
