Introduction
Microcomputer protection device is composed of microcomputer relay protection, is the direction of the development of power system relay protection (now basically realized, still need to be developed), which has a high degree of reliability, high selectivity, high sensitivity. Microcomputer protection device hardware including microprocessor (microcontroller) as the core, with input and output channels, man-machine interface and communication interface. The system is widely used in electric power, petrochemical, mining and smelting, railroad and civil buildings. The hardware of the microcomputer is universal, while the performance and function of the protection is determined by the software.
Operation principle
The digital core of the microcomputer protection device is generally composed of CPU, memory, timer/counter, Watchdog and so on. Currently the mainstream of the digital core for the embedded microcontroller (MCU), that is, usually referred to as a microcontroller; input and output channels include analog input channels (analog input conversion circuit (CT, PT measured into a lower amount of suitable for internal A/D conversion of the amount of voltage, ± 2.5V, ± 5V or ± 10V), low-pass filter and sampling, A/D conversion) and digital input and output channels (human-computer interface and various kinds of watchdogs). channels (human-machine interface and various alarm signals, trip signals and power pulses, etc.). Introduction
The DC panel is a new type of digital control, protection, management and measurement of the new DC system. The monitoring host is highly integrated and adopts single board structure (All in one), containing functions such as insulation monitoring, battery inspection, grounding and routing, battery activation, silicon chain voltage stabilization, and microcomputer central signaling, etc. The host is equipped with a large LCD touch screen, which can be used as the main control panel. The host is equipped with a large LCD touch screen, and various operation status and parameters are displayed in Chinese characters. The overall design is convenient and concise, and the man-machine interface is friendly, which is in line with the user's habit of use. The DC screen system provides powerful functions for remote detection and control, and has remote control, remote adjustment, telemetry, telemetry, telecommunication functions and remote communication interface. Through the remote communication interface, the operating parameters of DC power supply system can be obtained from a remote place, and the operating status and fixed value can also be set and modified through this interface, which meets the requirements of power automation and unattended substation of power system; it is equipped with standard RS232/485 serial interface and Ethernet interface, which can be conveniently incorporated into the automation system of power station.
Working Principle
The DC screen can set the parameters of each part of the system through the monitoring module. The module has the function of smooth adjustment of output voltage and current, and has the function of battery charging temperature compensation.
With a number of extended communication ports, it can access a variety of external intelligent devices (such as battery tester, insulation monitoring device, etc.).
Modern power electronics and computer network technology combined to provide the power system "telemetry, remote control, telecommunication, remote control" support, to achieve unattended.
Automatic battery management and protection, real-time automatic detection of battery terminal voltage, charging and discharging current, and intelligent control of the battery are floating charging, with a battery over-voltage and charging over-current sound and light alarms.
System adopts monitoring device built-in insulation monitoring, battery detection