变电站PTN线远程在线监测装置与系统集成关键技术研究应用

Research and Application of Key Technology of Remote On-Line Monitoring Device and System Integration for PTN Line in Substations

中国南方电网有限责任公司继电保护反事故措施汇编要点中明确规定对PT二次回路一点接地电流进行定期的检测,针对当前变电站PT一点接地线维护工作中所存在的问题,反映出在线监测系统的不足,为此研制出了新型的"变电站PIN线远程在线监测装置与系统集成"。通过现场试验和动态数据监测分析,已经完成装置全部功能的测试。目前在珠海供电局两个110 kV站投入试运行,装置运行稳定。在我国电力系统PTN600线上实现了有效在线监视和数据监测管理,对PT二次回路一点接地的不平衡状态的动态数据进行实时滚动循环监测,及时给工作人员反馈运行信息,有效保证了大电网复杂继电保护以及自动装置的运行稳定安全。该系统的研发,实现了PTN线运行数据就近采集,为PTN线在线监测装置提供物理基础;实现PTN线上电流数据进行远程技术管理,可通过珠海供电局4 G专线或GPRS精确远传到继电保护办公室的计算机办公平台,提供可靠的PTN线大数据运行分析管理,形成采集、远程传输、分析管理、故障预警系统集成,最终形成南方电网所要求的PT中性点监测的作业表单。该系统集成代替人工巡视,自动预警,可通过系统数据分析,为变电站PT设备的维护、优化管理、识别判断PT设备健康运行提供依据。

Aiming at the problems of the PTN line maintenance and the weakness of the on-line monitoring system existing currently,a new System of Integrated PTN Line Monitoring Device and System Integration is developed according to the anti-accident measures of relay protection in China Southern Power Grid.The system has gone through the field test and dynamic monitoring data analysis with all the functions have been tested and put into trial operation in two 110 kV substations in our company with stable and satisfactory result up to today.The system is the first one to realize the effective online monitoring and data monitoring management on the PTL600 line in China,and it is also able to perform the real-time monitoring of the working state of the normal operation of the PT（the imbalance states of the neutral point in the secondary circuit）,and to feed back the operation information to the operation staff in a timely manner to ensure the stability and safety of the complex relay protection and automatic devices of the large power grid.The developed system helps to realize the local collection of the PTN line operation data and to provide the physical basis for PTN line monitoring device and realize the remote management of the data from the PTN and management of large data of the PT neutral line.The system integrates data collection,remote transmission analysis management,and fault warning functions and is able to form the job forms of the PT neutral point monitoring as specified by China Southern Power Grid Corporation.The system integration can replace the manual inspection and realize the automatic alarm,and through the system data analysis,it can provide the basis for the substation PT equipment maintenance,optimization management,and identification and judgment of soundness of the PT equipment.