现代制造工程Issue(2)：19-24,6.DOI:10.16731/j.cnki.1671-3133.2017.02.004
煤矿低压开关相敏保护器设计
The design of low-voltage switch phase-sensitive protector of coal mine
摘要
Abstract
In order to solve the over-current discriminate problem between the short circuit fault and motor starting in coal mine power supply system protection,designed a phase-sensitive detection protector based on the function of signal input capture in the timer of the STM32 chip.Through the experiment and analysis,the power factor discriminate value of asynchronous motor starting was set 0.4 ～ 0.5.The phase relationship of system voltage and current input to the timer pin as square wave converted by hardware circuit.The timer capture the adjacent edge of square wave get level last time,acquire the level duration of the phase difference between voltage and current signals,obtained the system power factor.Tested by the experiment,the protector can accurately measure the power factor of system and use discriminate value realizes the discretion of short circuit fault and the normal starting of motor.关键词
短路故障/电动机起动/输入捕获/STM32芯片/相敏保护器/功率因数Key words
short circuit fault/motor starting/input capture/STM32 chip/phase-sensitive protector/power factor分类
信息技术与安全科学引用本文复制引用
吴尧辉,吴天博,秦凡..煤矿低压开关相敏保护器设计[J].现代制造工程,2017,(2):19-24,6.基金项目
国家自然科学基金项目(61340015) （61340015）
河南省教育厅项目(2009B470003,2010A470003) （2009B470003,2010A470003）
