基于比率差动的导引线纵差保护装置替代方案

An Alternative Scheme of Guide Line Longitudinal Differential Protection Device Based on Ratio Differential Protection

导引线纵差保护装置的陆续停产、备品备件的不足给城市供电带来一定的安全隐患。在保留原导引线传输通道的基础上,提出了一种基于比率差动的导引线纵差保护装置替代方案。分析了导引线保护目前存在的问题以及光纤纵差保护的特点;通过光纤纵差保护装置和导引线调制解调器相互配合,利用模拟调制解调技术实现数据在导引线上的远距离传输,然后借助乒乓法和拉格朗日插值法实现数据同步;阐述了各装置特点并对关键问题进行梳理;通过搭建测试平台验证数据通信可靠性并测试比率差动保护动作时间,实验结果表明:装置之间通信零丢帧,链路故障定位准确,比率差动保护动作时间满足线路保护要求。

The shortage of guide line longitudinal differential protection devices caused by discontinuing is threatening the power supply of cities.Keeping the original guide line transmission channel remained,an alternative scheme,based on the ratio difference theory,for the guide line longitudinal differential protection device is proposed.Firstly,the existing problems of guide line protection and the characteristics of optical fiber longitudinal differential protection are analyzed.Secondly,the optical fiber protection and guide line modem are cooperated to realize the long-distance transmission of data on the guide line by the utilizing of analog modulation and demodulation technology,and furthermore,the data is synchronized by adopting ping-pong procedure and Lagrange interpolation method.Thirdly,the characteristics of these devices and their key points are elaborated.Finally,a simulation test verified that,there is no frame loss of communication between devices,and the link fault location is accurate,and the action time of ratio differential protection meets the requirements.