交流控制回路感应电压计算分析与故障处理

Analysis and Troubleshooting of Induced Voltage in AC Control Circuit

交流控制回路间存在感应电压,严重情况下感应电压会影响被控元件的可靠动作,影响设备正常运行。分析了交流控制回路感应电压产生的原因,结合某水电站地下厂房加压送风风机控制回路中接触器无法释放的问题,提出消除感应电压的三种方法,并进行计算分析,通过并联电容的方法解决现场问题,该故障处理方法可行有效。

The induced voltage exists in AC control circuits,and it may affect the reliable actions of controlled components to disturb the nor-mal operation of equipments in some serious cases.First,the paper analyzes the causes of induced voltage in AC control circuits.Then,it takes the release problem of a contactor in the control circuits occurring to the pressurization fan in the underground powerhouse of a hydropower station as the research object,and proposes three methods to eliminate the induced voltage.After calculation and analysis,the paper chooses the method of parallel capacitors to solve the release problem,which verifies this troubleshooting method feasible and effective.