摘要
为了改善煤矿井下掘进工作面长距离供电系统末端电压质量问题,提出了基于固态增压器(SSVI)的有载自动调压系统拓扑结构。由于采用了脉冲宽度调制(PWM)技术,发生人身触电事故时的电流增大,远大于30 mA的安全电流;现有真空断路器固有动作时间较长,导致单相漏电故障全断电时间较长,触电危险性大幅度提高;因此必须采用快速断电装置,只有将故障全断电时间缩短到17 ms以内,才能保证触电者不致死亡;另外,线路电压的大范围调节,给漏电保护的整定和故障定位带来困难,采用以零序电压与相对地电压的相量比为判据,对有载自动调压供电系统的单相漏电故障进行正确检测,可大致估算出漏电故障发生的线路位置。
In order to improve the voltage quality of long distance power supply system in coal mine,a topological structure of on-load automatic voltage regulation system based on solid state supercharger(SSVI)is proposed.Due to the use of PWM modulation technology,the occurrence of personal electric shock accident current increases,much larger than the 30mA safety current;Due to the long inherent operation time of the existing vacuum circuit breaker,the total power failure time of single-phase leakage is longer,and the risk of electric shock is greatly increased.Therefore,the fast power off device must be used to shorten the failure time to 17ms in order to ensure that the electric shock will not die;In addition,the wide range of line voltage regulation brings difficulties to the setting of leakage protection and fault location.Using the phasor ratio between zero sequence voltage and relative ground voltage as the criterion,the single-phase leakage fault of on-load automatic voltage regulation power supply system can be correctly detected,and the line location where the leakage fault occurs can be roughly estimated.
作者
杨阳
王彦文
王栋
周暄
YANG Yang;WANG Yanwen;WANG Dong;ZHOU Xuan(School of Electromechanical and Information Engineering,China University of Mining and Technology,Beijing 100083,China)
出处
《电气应用》
2023年第5期38-45,I0004,共9页
Electrotechnical Application
关键词
煤矿井下
固态调压器
过电流保护
漏电保护
underground coal mine
solid state regulator
overcurrent protection
leakage protection
