After nearly 20 years of application, research and development, microcomputer protection has achieved great success in the power system, and accumulated a wealth of operational experience, resulting in significant economic benefits, greatly improving the level of power system operation and management. In recent years, with the rapid development of computer technology and the widespread application of computers in the field of power system relay protection, new control principles and methods have been continuously applied to computer relay protection in order to achieve better results, thus enabling microcomputers. The research on relay protection is developing to a higher level. The future trend of relay protection technology is to computerization, networking, intelligence, protection, control, measurement and data communication-body development.
1 computerization
With the rapid development of computer hardware, microcomputer protection hardware is also constantly developing. Power system requirements for microcomputer protection continue to increase. In addition to the basic functions of protection, it should also have large-capacity fault information and long-term storage space for data, fast data processing functions, powerful communication capabilities, and other protection, control devices and scheduling. The ability to network to share system-wide data, information and network resources, high-level language programming, and more. This requires the microcomputer protection device to have the function equivalent to a PC. The computerization and computerization of relay protection devices are an irreversible development trend. However, it is necessary to conduct in-depth and in-depth research on how to better meet the requirements of power systems, how to further improve the reliability of relay protection, and how to achieve greater economic and social benefits.
2 network
As a technology and data communication tool, computer network has become the technical pillar of the information age. It has profoundly affected various industrial fields and provided powerful communication means for various industrial fields. Until now, all relay protection devices except the differential protection and the longitudinal protection have only responded to the electrical quantity of the protection installation. The role of relay protection is mainly to remove faulty components and reduce the scope of accidents. Because the role of relay protection is not limited to the removal of faulty components and limit the scope of accidents, but also to ensure safe and stable operation of the entire system. This requires each protection unit to share the data of the operation and fault information of the whole system. Each protection unit and the reclosing device coordinate the actions on the basis of analyzing the information and data to ensure the safe and stable operation of the system. Obviously, the basic condition for realizing such system protection is to connect the protection devices of all major equipments of the whole system with a computer network, that is, to realize the networking of the microcomputer protection device.
3 intelligent
With the development of smart grids, distributed generation and interactive power supply modes put forward higher requirements for relay protection. On the other hand, the rapid development of communication and information technology, the increasing popularity of digital technology and applications in all walks of life are also explored. The new protection principle provides conditions for real-time monitoring of the operating conditions of key equipment such as power generation, transmission, distribution, and power supply in the smart grid, and then collecting and integrating the obtained data through the network system, and finally performing data on the data. analysis. Use this information to monitor health and enable remote dynamic monitoring and correction of protection functions and protection settings. In addition, for the protection device, in addition to the operation information of the protection object, the protection function requires the operation information of the associated other device. On the one hand, it ensures accurate and real-time identification of faults, on the other hand, it can ensure that faults and self-recovery can be quickly isolated without large or small manual intervention, and large-scale power outages can be avoided.
Protection, control, measurement, data communication integration Under the condition of computerization and networking of relay protection, the protection device is actually a high-performance, multi-functional computer, which is an intelligence on the entire power system computer network. terminal. It can obtain any information and data of the operation and failure of the power system from the Internet, and can transmit any information and data of the protected components it obtains to the network control center or any terminal. Therefore, each microcomputer protection device can not only complete the relay protection function, but also complete the measurement, control, and data communication functions under the condition of no fault and normal operation, that is, realize protection, control, measurement, and data communication-bodyization.
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