Intelligent substation is the core of the smart grid. New technologies have also brought about problems with great benefits and conveniences. For example, after the secondary circuit is networked, it becomes unmeasurable and invisible, which brings great inconvenience to the operation and maintenance work. In response to this problem, Maoming Power Supply Bureau of Guangdong Power Grid Corporation has explored and applied the secondary circuit of intelligent substation and network visualization supervision technology for more than two years. This technology displays the secondary circuit of intelligent substation in an intuitive way and provides means for detection and maintenance. Improve the operation and maintenance level of intelligent substation. This technology has won the third prize of the China Southern Power Grid Corporation Technology Progress Award. Learning from the experience of secondary loops "The secondary circuit of the traditional substation is equipped with cables. The operation and maintenance personnel only need to take the tools such as relays, multimeters, screwdrivers and other tools to measure the cable, and then they can grasp whether the circuit has defects. The only intelligent substation in Maoming City - Wen After the network of the punching intelligent substation is realized, the secondary circuit is only a switch and a network cable in front of the operation and maintenance personnel. As for whether the signal is abnormal or not, it is difficult to find it by traditional means, which brings the operation and maintenance of the intelligent substation. The challenge.†Chen Honghui, the person in charge of the project, said that the status quo prompted the bureau to seek solutions. The innovation team began to explore. "The traditional substation secondary circuit has a loop diagram and a logic diagram. The operation and maintenance personnel judge whether the equipment is operating normally according to the relationship of the logic diagram. After the intelligent substation is networked, it relies on two bits of '0' and '1'. Record, our idea is to convert the computer's '0' and '1' signals into logic diagrams through software, which is more intuitive." Chen Honghui said. Under the guidance of this basic idea, the team began to explore boldly. First you need to collect a lot of data. The team selected the network packet analyzer for high-speed storage, and can map various information on the network to a port connected to the switch for collection, thereby completing high-speed information storage. After the acquisition is completed, the team develops the software system to automatically analyze the information and display it as a logic diagram. Through the cooperation of hardware and software, the signal is converted into a logic diagram, and the operator can intuitively monitor the links of all devices in the network. The communication status and the abnormal conditions of each interval facilitate the operation and maintenance personnel to inspect the operation status of the network equipment and improve the safety management and control level of the intelligent substation. Reduced costs and more reliable operation "The technical results can improve work efficiency." Chen Honghui said. Due to changes in the form of information, the debugging work of intelligent substations has become more complicated than before. With the results of the project, the communication process between devices of different manufacturers can be graphically displayed during the debugging process, and the cause of the fault can be quickly checked, thereby reducing the debugging workload, improving the debugging work efficiency, saving secondary equipment manufacturers, power system operating units, and electric power. The scientific research institutions and other units spend the manpower and resources at the time of commissioning work. In the past, failures required maintenance personnel to check one by one, which was time-consuming and laborious. Now, just look at the system, you can accurately locate the fault point, and the efficiency is greatly improved. Take Maoming 110 kV Wenchongkou intelligent substation as an example. The substation has four 110 kV lines and two main transformer intervals. According to the frequency of weekly maintenance, it takes 2 people to work for 1 day to complete the maintenance of the entire substation. The maintenance workload of 100 people the next day (1 time/week & TImes; 2 people & TImes; 1 day & TImes; 50 weeks = 100 person days/year) is required. If the research results are applied, the operation and maintenance cost of this part can be exempted. In addition, by applying this technology, the operational reliability of the substation can be improved. It is reported that the research project pioneered the online detection method of virtual secondary loop of intelligent substation, solved the hysteresis of fault identification, and significantly improved the self-checking capability of the network secondary loop. If the research results of the project are applied in the intelligent substation, Real-time detection and analysis of the secondary circuit status of the substation network, timely release of warnings to avoid accidents. At present, the technology has obtained 1 invention patent, 2 utility model patents, and 1 software copyright.
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