What are the basic structures of a microcomputer-based protection device? What are the main functions of microcomputer-based protection? What components are typically included in the hardware of a microcomputer-based protection device? A microcomputer-based protection device is a relay protection device that uses a microcomputer and corresponding software (programs) to implement various complex functions. Microcomputer-based protection consists of two main parts: hardware and software.
The hardware of a microcomputer protection device generally includes the following five parts:
(1) Data acquisition system, which accurately converts analog input signals into the required digital quantities.
(2) The CPU main system includes a microprocessor (MPU), read-only memory (EPROM), random access memory (RAM), and timers. The MPU executes the program stored in the EPROM and analyzes and processes the raw data input from the data acquisition system to the RAM area to complete various relay protection functions.
(3) The digital input/output system consists of several parallel interface adapters, opto-isolation components and intermediate relays with contacts, etc., to complete various protection output tripping, signal alarm, external contact input and other functions.
(4) Human-machine interface and communication system: Human-machine dialogue can usually be achieved through keyboard, Chinese LCD display, printer, signal light, sound or voice alarm, etc., and communication can be carried out through communication interface, local area network, Ethernet.
(5) Power supply system: provides a stable and reliable power supply for the microcomputer protection device.
Microcomputer protection software is a computer program developed to meet the needs of relay protection. The characteristics of microcomputer protection are mainly determined by the software, giving it great flexibility; different protection principles can be implemented using common hardware.
