Four technical development trends of Bay control unit

17 Nov 202120

   The microcomputer integrated protection device has a complete self-checking function, which is very convenient for detection and debugging. Once an abnormality is found, the central processing unit CPU will direct the signal generator to send out corresponding sound and light alarm signals; at the same time, various additional protections are easy to implement Functions, such as printing fault information after protection action, recording protection action time, etc. Let us now understand the four technological development trends of bay control unit

    First, computerization.

    With the rapid growth of computer hardware, computer protection hardware is also advancing continuously. Now the integrated microcomputer device for protection, control and measurement based on 32-bit digital signal processor (DSP) has been successfully developed and put into use. The use of a 32-bit microcomputer chip not only greatly improves the accuracy, but more importantly, the 32-bit microcomputer chip has a high degree of integration, a high operating frequency and calculation speed, a large storage space, and a rich instruction system. And more input and output interfaces. Persistent storage space for information and data, fast data processing capabilities, powerful communication functions, and the ability to network with other protection, control devices and dispatchers to share system-wide data, information and network information, which requires the microcomputer protection device to have considerable Functions in a PC. Now, industrial computers that are very similar to bay control unit have achieved tremendous growth in terms of function, speed, storage capacity, and reliability, and the cost continues to decline. Therefore, the time to use a complete set of industrial computers as relay protection devices has passed. Mature, this will be one of the future development goals of microcomputer protection.

    Second, networking.

    As a tool of information and data communication, computer network has become the technical pillar of the information age. It deeply influences various industrial fields and also provides powerful means of communication for various industrial fields. Traditional relay protection is very professional, and is characterized by "pre-setting, real-time action, and regular inspection". It rarely touches the regular self-check of the assembly or system, remote monitoring, information sharing, and dynamic revision of the fixed value. And other issues. The concept of system protection has long been proposed in foreign countries. At that time, it mainly refers to safety automatic devices, but it is also applicable to relay protection. The role of relay protection should not only be limited to removing faulty components and limiting the scope of the accident (this is of course its main mission), but also to ensure the safe and stable operation of the entire system. This requires that every protection unit can share the information of the normal operation and failure of the whole system, and the network of a large amount of information on this basis is also of great benefit. The relay protection device can obtain information related to the system. The more, the more accurate the judgment of the nature of the fault, the fault location and the fault distance, and the higher the sensitivity, selectivity and reliability of the action. It can be seen that the networking of bay control unit can greatly improve the performance of relay protection, which is the inevitable trend of the development of microcomputer protection.

    Third, integration.

    At the end of the 1980s and the beginning of the 1990s, with the advent of the transmitter RTU, the protection device is actually a high-performance, multi-functional computer. It can obtain all the information and data during the normal operation and failure of the system, and it can also Calculations and judgments are based on the data obtained, and the results are uploaded to the control center or any terminal via the intermediate network. Therefore, each microcomputer protection device can not only complete the traditional relay protection function, but also under the normal operation of the system It can also complete functions such as metering, control, data communication, that is, to realize the integration of device protection, control, metering, and data communication.

    Fourth, intelligence.

    In recent years, artificial intelligence has been used in various fields of power systems, and research on its application in the field of protection devices has also begun. These artificial intelligence algorithms have their ability to solve complex problems. If these artificial intelligences are properly linked, the calculation speed can be faster. It is foreseeable that artificial intelligence technology will be used more and more commonly in the field of relay protection to solve problems that are difficult to solve with conventional methods. The world's well-known automation system suppliers continue to innovate and develop many excellent microcomputer relay protection device platforms. The difference between DSP and general CPU is a microprocessor with a special structure in order to achieve fast calculations. In view of this, a new type of microcomputer relay protection device with DSP as the hardware platform has been developed at home and abroad to promote the further improvement of the comprehensive automation level of substations.