Because relay protection plays an important role in the power system and its ability to continuously and securely supply power to the power system, the relay protection must have certain performance and characteristics. Therefore, relay protection workers should also put forward corresponding requirements. The main features of relay protection and its requirements for workers are as follows.
(1) The power system is an organic whole consisting of many complex primary equipments and auxiliary equipment such as secondary protection, control, regulation, and signals. Each device has its own unique operating characteristics and operating conditions at the time of the fault. The failure of any equipment of the three-phase microcomputer relay protection tester will immediately cause the change or destruction of the normal operating state of the system, and cause different degrees of influence to other equipment and the entire system. Therefore, relay protection work involves each electrical main equipment and secondary auxiliary equipment. This requires the relay protection workers to have a deep understanding of the working principles, performance, parameter calculations, and failure status analysis of all these devices, as well as extensive knowledge of production operations. In addition, there must be a clear concept for the planning and design principles of the entire power system, the basis for the development of the operating modes, the theory of voltage and ground rate transfer, the method for calculating the trend and stability, and the principles and methods of economic dispatch and safety control.
(2) The power system relay protection is a comprehensive discipline. It is based on basic theories such as theoretical electrical engineering, electrical engineering, and power system analysis. It is also related to new theories such as electronic technology, communication technology, computer technology, and information science. Technology has a close relationship. Looking at the history of relay protection technology, we can see that every major advancement in power system communication technology has led to the emergence of a new protection principle, such as high-frequency protection, microwave protection and fiber optic protection; six-phase microcomputers The emergence of every new electronic component in the electrical protection tester also caused a revolution in relay protection devices. From the development of electromechanical relays to the protection of body pipes, integrated circuit protection devices and computer protection, this problem is fully illustrated. At present, the protection of microcomputers and the realization of optical fiber communication and information networks are making a fundamental change in the appearance of relay protection technology. Some new theories, new concepts and new methods will appear in the design, manufacture and operation of relay protection. From this it can be seen that relay protection workers should pay close attention to the development of new theories, new technologies, and new materials in neighboring disciplines, actively and cautiously apply various new technological achievements, and continuously develop the theory of relay protection and improve its technology. Level and reliability indicators, improve the performance of the protection device to ensure the safe operation of the power system.
(3) Relay protection is a discipline that emphasizes both theory and practice. In order to understand the performance of the relay protection device and its behavior when the power system fails, it is necessary to use the theoretical knowledge of the learned course to analyze the system fault condition and the protective device's action behavior, and the relay protection device must be tested in the laboratory. Tests, digital simulation analysis, three-phase relay protection test on the dynamic model of the power system, on-site manual fault tests, and trial operation under field conditions. Only theoretical analysis cannot consider that the understanding of protective performance is sufficient. Only through various rigorous tests, the test results and the theoretical analysis are basically the same, and meet the predetermined requirements before they can be adopted in practice. Therefore, to do a good job in relay protection work must not only be good at theoretical analysis of complex system operation and protection performance problems, but also must master scientific experimental techniques, especially the technology of commissioning and experiment under field conditions.
(4) The slightest mistake in relay protection may have a serious impact on the operation of the power system and bring incalculable losses to the national economy and people's lives. Domestic and foreign power systems collapsed several times, which led to serious accidents in the areas of industrial and agricultural production and the chaos of social order in most regions. Six-phase relay protection devices were often caused by improper operation of a relay protection device. Therefore, relay protection workers have a heavy responsibility for the safe operation of the power system. This requires that relay protection workers have a high degree of responsibility, rigorous and meticulous style of work, and establish the idea of ​​reliability first in their work. In addition, they are also required to have a spirit of cooperation, actively cooperate with the planning, design and operation departments to analyze and study the development and operation of the power system, understand the requirements for relay protection, in order to take timely measures to ensure relay protection to meet the power system Operational requirements.
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