Relay protection device

1, the principle: microcomputer protection and traditional protection in principle there is no essential difference, just the powerful computing power and storage capacity of the microcomputer itself makes certain algorithms in the microcomputer can be easily realized, 2, the use of: microcomputer protection of the integrated hardware and software model, so that the reliability of microcomputer protection device has greatly improved, and therefore in the use of the easier, basically, is a black box. 3, communication: traditional protection basically no communication function, and microcomputer protection can be extended out of Ethernet, 485 and other communication interfaces, communication is very convenient. Conventional relay protection disadvantages: conventional relay protection is a combination of relays, such as: overcurrent relays, time relays, intermediate relays, and so on through the complex combination to achieve the protection function, its shortcomings: 1. Occupy a lot of space, the installation is not convenient 2. The use of relay contacts, greatly reducing the protection of the sensitivity and reliability of the debugging, maintenance is complex, generally have to be blacked out to be able to, affect normal production 4. No flexibility, when the CT ratio changes, the protection value modification to be adjusted on the relay, and sometimes have to be replaced. 5. The service life is too short, due to the aging of the relay coil directly affects the reliable operation of the protection. 6. Relay protection function is single, have to install all kinds of meters to observe the real-time load 7. Data can not be remote monitoring, can not realize remote control 8. Relay itself does not have the monitoring function, when the relay coil short-circuiting, can not be detected until the scene. 9. Relay protection is directly connected to the electrical equipment, there is no optical isolation in the middle, easy to suffer from lightning strikes. 10. Conventional protection has been gradually eliminated, many relays have stopped production. 11. Complicated maintenance, difficult to find the problem after the failure. 12. Operation and maintenance workload, operating costs than the microcomputer protection increased by about 60%. 13. Complex operation, low reliability, in the past operating experience found that the occurrence of many accidents are mainly due to two reasons: A man-made reasons: because of the low level of automation, the operation of the complexity of accidents caused by the occurrence of the B relay protection equipment performance level is low, the secondary equipment can not be effective in detecting faults. 14. Economic analysis: conventional protection from a single set of prices than the microcomputer protection is about cheap, but the use of the number of cables, screen cabinets, especially the short life of the device, the operating costs (management costs, maintenance costs, etc.) than the microcomputer protection 60% higher than the overall cost of microcomputer protection is still more than the microcomputer protection. Advantages of microcomputer protection: 1. Microcomputer protection is the use of microcontroller original, the system has the collection, monitoring, control, self-checking functions, through a device can be found: transmission line faults, transmission line loads, their own operation (when the equipment itself some kind of failure, microcomputer protection through the self-checking function, the failure to be presented), the use of the principle of the computer to carry out remote control and monitoring. 2. As the microcomputer protection using a variety of power logic operations to achieve the protection function, so only need to collect the current and voltage on the line, which greatly simplifies the wiring. 3. Microcomputer protection of the protection outlet, remote control outlet, local control outlet is through a set of relay action, so it is very reliable. 4. Microcomputer protection using computer control functions, protection values, protection functions, protection means using program logic, so that you can always modify the protection parameters, modify the protection function, no need to recommissioning. 5. Microcomputer protection also has a communication function, through the network to the user needs a variety of data transmission to the monitoring center for centralized scheduling. 6. Microcomputer protection using optoelectronic isolation technology, the collection of all electrical signals up to the unified formation of optical signals, so that when there is a strong current attack, the device can establish its own protection mechanism. 7. Microcomputer protection using the CPU for data processing, increasing the speed of data processing. 8. Microcomputer protection of long life, due to the equipment in the normal state in a dormant state, only the program running in real time, the life of each component is greatly extended. 9. Microcomputer protection with a clock synchronization function, for the fault can be recorded, using the fault recording method to record the fault, to facilitate the analysis of the fault. 10. The microcomputer protection adopts multi-layer printed board and surface mounting technology, which has high reliability and anti-interference ability. 11. Ease of use: Chinese user interface standardization, easy to learn, easy to use, easy to maintain. 12. Economic analysis: microcomputer protection from a single set of prices than conventional protection is about more expensive, but the use of a very small number of cables, screen cabinets, especially the service life of up to 25 years, the operating costs (management costs, maintenance costs, etc.) than the conventional protection to reduce the cost by 60%, the overall cost of the conventional protection is still much less than.