The Research And Application Of An Integrated Early Alarming System On Substation

With the rapid development of China's power industry, power enterprises have greater demand for unmanned transformer substations, which are the requirements to simplify the human resources and improve efficiency for power enterprises. On the other hand, the substations play an important role in modern power transmission and distribution. The safe operation of substaions is particularly important. Once the substation has fewer or no man on duty, three problems, i.e., the reliability of substation equipment operation, substation safety management and remote monitoring must be solved.In this work, based-on advanced network communication, computer and intelligent detection technologies, an integrated early warning system for substation safe operation is studied and developed. A hierarchical and distributed architecture is employed in our system, which is constituted by three parts:the substation terminals, control centers and communications networks. Firstly, the general system scheme is introduced. Secondly, the communication techniques employed in the system are studied. The CAN Bus, RS-485/232 Bus, Ethernet network and ZigBee wireless communications are discussed in detail. Then, the video monitor unit and the safety early warning unit are studied respectively. For the video monitor unit, the total hardware schemes and the further development of DVR are focused. For the safty early waring unit, the hardware design of the terminal devices is emphasized. Next, the integrated early warning software system is discussed. The database design of the software system is studied in detail. Finally, a practical application of the developed system in real transformer substation is introduced. It is shown that the system can greatly improve the safe level of the substation operation.