Research Of GIS On-line Partial Discharge Monitoring System Based On ZigBee

With the rapid development of China’s power industry construction, the once open-type equipment has gradually been replaced by Gas Insulated Switchgear(GIS), which is mainly applied at 110kV and above voltage substation as well as the underground substation. However, in the light of the actual operation, the GIS equipment failures often occur due to insulation flashover. While GIS insulation flashover occurs in some important substations, it will cause a major power outage. And its repair work is more troublesome than open-type equipment, requiring much longer time and causing great economic losses to the company and society.Studies show, GIS insulation flashover is mainly caused by the partial discharge of internal components. Domestic mainstream online monitoring technique of GIS bureau is now ultra-high frequency test. However, the existing substation equipment on-line monitoring system using fiber optic cable, cable and other media for data transmission, and cable laying, etc. will increase the difficulty, because the actual situation of different. Further, since the types of complex substation equipment, and the shape is not the same, impeding the network upgrading and expansion and wasting a great deal of manpower and resources in installation and routine maintenance. Therefore, the development of a wireless device GIS online monitoring system is of great significance for providing timely information of equipment condition, protecting the safe and stable operation of the power grid, reducing monitoring costs and improving the intelligence level of the substation.Based on the above situation, this paper achieved signals Wireless transmission through the use of ZigBee technology to establish a wireless sensor network, which can avoid the disadvantages of wired media transmission, save resources, reduce the monitoring cost, and worth popularizing in the system. In this paper, the actual situation of GIS equipment, combined with the structural features of the wireless sensor network and the requirements of designing the monitoring system, an overall system design was formulated. The wireless sensor network topology of monitoring system utilizes network type network, consisting of the coordinator and EndDevice. The system uses UHF sensor which is installed on the GIS basin insulator to collect GIS PD signal, internal coordinator node by establishing a collection of wireless network terminal nodes of each sensors to collect the information, and to send the information to the Personal Computer (PC). HMI based on LabVIEW, It will show the collected data and information in the form of data and graphics, And to provide sound and light alarms and data storage, and other functions. Finally the GIS equipment within the substation real-time monitoring of partial discharge is realized.Finally, feasibility tests were carried out on the designed Bureau of GIS online monitoring system based on ZigBee technology. The experimental results and related data show that the uhf sensor can collect accurate uhf signal, the ZigBee wireless network transmits signal reliably, LabVIEW monitoring interface displays correctly, and the whole system runs stably, thus meeting the requirements of the original design.