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This post was last edited by chenjinfeng on 2020-3-27 at 14:27. Microcomputer-based protection devices have now become an essential part of power plants, and their role in such plants cannot be ignored. For this very reason, careful consideration must be given when selecting microcomputer-based protection systems; carelessness is not acceptable. However, for a power plant, the following points should be considered when selecting microcomputer-based protection systems. 1. Whether it meets the actual requirements on site, including protection functions, voltage level, presence of a printing interface, communication methods, and the amount of fault information that can be stored. Depending on the manufacturer and model, these parameters will definitely vary. When considering these factors, it is necessary to take into account the actual technical requirements on site; higher technical requirements naturally lead to higher prices. In general, it is advisable to choose equipment that offers a good cost-performance ratio. 2. For a power plant. Try to use microcomputer protection devices from the same manufacturer, and preferably those from the same series. This allows for standardization at the hardware level, and some hardware components can be interchanged, such as power adapters. Moreover, the opening sizes are also made as uniform as possible, which facilitates the maintenance of microcomputer-based protection systems. If a problem arises, one only needs to find a manufacturer of microcomputer protection systems, enabling a one-to-one solution. Not only that, but fewer types of spare parts are required, which also results in significant cost savings. 3. The reliability of microcomputer-based protection depends on the rationality of the protection function criteria. For example, in the case of automatic transfer to a backup system, the situation of a broken TV line must be taken into account; the protection should not activate when the TV line is broken, which requires the implementation of a lockout mechanism for such situations. 4. During on-site commissioning of microcomputer protection devices, it is necessary to conduct tests on each one of them and set the appropriate parameters. Common protections such as quick-break protection and overcurrent protection are easy to implement for ordinary microcomputer protection debuggers. However, for some less common protection functions, such as over-excitation protection, optical differential protection, rotor grounding protection, etc. These protection functions are uncommon, and some microcomputer protection testers from debugging agencies are not very familiar with them; sometimes they simply ignore such experiments. This is not correct; for every microcomputer-based protection function, it is necessary to carry out the relevant work carefully whenever there is an actual need on site, and then conduct experimental tests – this process must not be taken lightly. 5. If the station requires scheduling functions or background monitoring, it is advisable to use equipment from the same manufacturer; this makes data collection easier and ensures better data stability. Avoiding a situation with equipment from multiple manufacturers not only makes it difficult for the commissioning team to carry out their work, but it also poses problems for the owners and maintenance staff in the future.