Optical power meter real - time monitor optical power of each optical cable , and control computer gather the value of optical power attenuation circularly , if some values excess the limit , the computer control optical switch to connect another spare optical fiber with otdr card , control the otdr card to test the optical fiber , and then find the malfunction point accurately . the system require software system to run with hardware devices tother . this paper analyze requirement and technical feasibility in software system , ooa and uml are used to analyze software and abstract the class diagram 通过光功率计对每条光缆中的备用光纤进行实时的监控,测试光功率的衰减值,主控计算机不断循环的对每个光功率模块进行数据采集,并记录每路光信号的光功率衰减值,然后进行分析处理,如发现达到设定的光功率衰减门限值就报警,并控制光开关的切换,将故障光缆中的另一备用光纤与otdr卡连接,通过otdr卡对该光纤进行测试,从而确定故障点。
4 ) putting forward the building project of gps rush to repair assistant management system based on the fact of customer service center of electric power of harbin power bureau , and ganging the call center and gps rush to repair assistant management together . it becomes truth that rushing to repair speedy , controlling vehicles , sending vehicles near by the abort place and relapse in time . so , the ability and efficiency of rushing to repair are improved comprehensively 4 )从哈尔滨电业局客户服务中心的工作实际需求出发，提出了“ gps报修辅助管理系统”的建设方案，将gps系统与呼叫中心系统有机地融合在一起，实现了抢修快速反应，对抢修车辆的监控，故障点就近派车，抢修及时回复等功能，全面提升了抢修工作的综合管理能力，提高了抢修效率。
This paper introduces control area network ( can ) into intelligent reclose controller , so it is very easy to construct multi - master system and multi - machine backup system . in feeder automation , after the intelligent reclose controller isolate faults , controller use the can to report fault message to dispatch center , helping determining the reason and fault point 将can总线引入重合控制器，不仅实现控制单元的多主式通讯系统及多主机备份，而且往馈线自动化系统中，在重合控制器无信道自动隔离故障的基础上，实现故障信息的汇总，便于调度中心及时的掌握故障原因及查找故障点。
Simultaneity this overvolgate damages greatly the equipment for power supply . after liberation , in our country eliminating arc loops were loaded in the neutral to compensate capacitive current , so that it can restrain the probability of arc generating in the exception point . apparently the intention is to avoid arc . owing to a great deal of characteristic of eliminating arc loop itself , it is difficult to compensate effectively capacitive current 我国目前解决的办法是在中性点加装消弧线圈补偿电容电流来抑制故障点弧光发生的机率。这种方法的目的是为了消除弧光，但由于消弧线圈的自身的诸多特点，很难对电容电流进行有效补偿，特别是高频分量部分对供电设备造成的危害无法克服。
The development of a visual short circuit software under ptcad2000 is presented in this paper , as well as the system structure , the definition of the data structure , the interface to ptcad2000 , the conversion of the original wiring diagram of power network to calculable power network , the implement of three sequence network , the implement of impendence matrix and admittance matrix of power network considering the zero sequence mutual inductances among lines , and the implement of short circuit calculation by using computer 本文介绍了在ptcad2000平台下短路电流可视化计算软件的开发。介绍了软件的系统结构、数据结构定义、与ptcad2000平台的接口、电力系统原始接线图转成等值可计算网络、序网的生成、考虑零序互感线路阻抗时电网导纳矩阵和阻抗矩阵的生成，以及故障点短路电流计算的计算机实现。
