With the continuous development and progress of the electrical industry, microcomputer protection devices have been widely used in the automation control part to replace traditional relays. From the development trend of the industry, microcomputer protection devices are inevitable in the future market. Microcomputer protection devices will inevitably replace traditional relay protection and become the initiative of the secondary part of electrical distribution. The product line of low-voltage microcomputer protection devices will also become more and more perfect.
The traditional 10kV distribution system is mainly based on radial wiring, supplemented by a combination of radial and trunk wiring. The receiving and feeding cabinets of the complete switchgear almost all use circuit breakers. This 10kV distribution method not only occupies a large area and requires high investment, but also has low reliability.
At present, the most commonly used ring main unit cabinets in China are load switch+fuse cabinets and air insulated load switch cabinets. They can not only reduce the area of high-voltage distribution rooms and lower the floor height, but also do not require power operation or specialized control rooms, which can further reduce the occupied area. This is more advantageous for distribution centers in high-rise buildings. The installation and debugging of the ring network switchgear are convenient, maintenance is simple, and it is easy to achieve automatic management of the power grid.
Overview of microcomputer protection devices
The application of ring main unit (RMU) in the development of the power industry is becoming increasingly widespread. In response to the current compact structure of RMU, Shanghai Boji Technology Co., Ltd. adopts a signal processor (ARM) and summarizes the successful operation experience of microcomputer protection and measurement devices in 6KV-110KV distribution stations. A series of microcomputer protection devices have been derived, which can be applied to cabinet placement, intelligent box transformer, intelligent outdoor switch, intelligent ring main unit, intelligent outdoor branch box, and intelligent outdoor metering and control device in distribution network automation systems. It integrates new digital control technology, anti-interference technology, and fault self diagnosis software repair technology, providing management capabilities for relay protection, fault location, monitoring and monitoring of power quality, and communication in high-voltage power systems with its minimal maintenance workload.
