Microcomputer protection software consists of initialization module, data acquisition management module, fault detection module, fault calculation module and self-check module. Usually, the hardware circuit of microcomputer protection consists of six functional units: data acquisition system, microcomputer main system, switch input and output circuit, working power supply, communication interface and man-machine dialogue system.

2. Protection function

Fixed time/inverse time protection, post-acceleration protection, overload protection, negative sequence current protection, zero sequence current protection, single-phase grounding line selection protection, overvoltage protection, undervoltage protection and voltage loss protection.

Negative sequence voltage protection, air cooling control protection, zero sequence voltage protection, low cycle load shedding protection, low voltage disconnection protection, reclosing protection, standby automatic switching protection, overheating protection, overcurrent protection, reverse power protection, differential protection, long start-up time protection, non-electric quantity protection, etc.

Extended data:

Working principle:

The digital core of microcomputer protection device is generally composed of CPU, memory, timer/counter, watchdog and so on. At present, the mainstream of digital core is embedded microcontroller (MCU).

The so-called single chip microcomputer; I/O channels include analog I/O channels (analog I/O conversion loop (converting the quantities measured by CT and PT into lower voltage suitable for internal A/D conversion, 2.5V, 5V or 10V), low-pass filtering and sampling, A/D conversion) and digital I/O channels (man-machine interface, various alarm signals, tripping signals, electric pulses, etc.). ).

Baidu Encyclopedia-Microcomputer Protection