Design On Microcomputer Detecting System For Air Circuit Breaker’s Intelligent Controller

Molded case circuit breakers used in low-voltage power distribution systems, is used to dealing with power fluctuations cause a severe overload, short circuit, over voltage, absent voltage, over current, leakage fault of an electrical equipment, you can cut off the circuit, fault isolation, and play a role in protection of distribution networks, electrical equipment. Intelligent releaser is the core of intelligent moulded case circuit breakers, not only with the general release of a variety of protective functions, also has real time parameter display, query, self-diagnostics, fault memory and communications functions.This topic is based on the NXP company of the world’s first ARM ® Cortex ?-M4 and Cortex-M0 dual-core architecture for asymmetric digital signal controller LPC4300 microcontroller; μ C/OS-III the embedded real-time operating system with an open source code release operating system. Information collected by hardware-related network micro-controllers, a/d converters analog to digital conversion; application based on fast Fourier transform processing of sampling data 2FFT; design of liquid crystal display real-time voltage values can understand the grid in real time, in power grid fault release quick release, protecting the entire grid and electrical equipment.This design uses dual-current transformers, measuring current transformer, protection of transformer and energy separating buttons, LCD display, in addition to real-time measurement of current for overload protection protection function, can also measure the voltage, power, harmonic analysis, to achieve power management.Intelligent release by the power module, a module, a/d converter module, MCU, human-machine interface, communication module, the I/O module and other components. The intelligent trip device for measuring and protection from hardware to software to maximize independence, from the transformer the signal input, signal conditioning circuits independently, MCU two kernels are dealing with the measurement and protection functions.