格库铁路青海段大部分处于偏远无人区,且区间无轨道电路,为检测断轨与减轻维护压力,设计了基于轨道电路原理的实时断轨检测系统。利用远距离无线电(Long Range Radio,LoRa)设计链式通信系统来传输报文,并进行理论指标验证;又在均匀传输...格库铁路青海段大部分处于偏远无人区,且区间无轨道电路,为检测断轨与减轻维护压力,设计了基于轨道电路原理的实时断轨检测系统。利用远距离无线电(Long Range Radio,LoRa)设计链式通信系统来传输报文,并进行理论指标验证;又在均匀传输线基础上得到轨道电路功率估计算式;随后,搭建信号发送系统,在室内利用模拟钢轨盘验证了使用功率估计区分断轨的可行性;最后,结合室内实验和链式通信系统搭建样机,现场测试验证了轨道电路功率估计算式的准确性。实验表明:利用轨道电路功率估计可有效、准确地完成断轨检测,室内和室外功率计算最小误差分别达1.06%和5.2%。相较于传统钢轨探伤方式,更适合在无人区非集中区段部署。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
文摘格库铁路青海段大部分处于偏远无人区,且区间无轨道电路,为检测断轨与减轻维护压力,设计了基于轨道电路原理的实时断轨检测系统。利用远距离无线电(Long Range Radio,LoRa)设计链式通信系统来传输报文,并进行理论指标验证;又在均匀传输线基础上得到轨道电路功率估计算式;随后,搭建信号发送系统,在室内利用模拟钢轨盘验证了使用功率估计区分断轨的可行性;最后,结合室内实验和链式通信系统搭建样机,现场测试验证了轨道电路功率估计算式的准确性。实验表明:利用轨道电路功率估计可有效、准确地完成断轨检测,室内和室外功率计算最小误差分别达1.06%和5.2%。相较于传统钢轨探伤方式,更适合在无人区非集中区段部署。
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.
