矿井3．3kV电网电压故障特征研究

Analysis on the Voltage Fault Feature of 3.3 kV Power Network System in Underground Mine

分析了矿井3．3kV电网电压暂态过电压与稳态电压故障特征的特点，计算了矿用3．3kV电动机的绝缘承受能力，确定了阻容吸收和压敏电阻的额定参数，设计了由暂态过电压保护和稳态电压保护组成的电压故障保护系统。试验结果表明系统运行稳定、可靠，实现了电压故障保护功能。

In this paper, the fault feature of transient overvoltage and steady voltage of 3.3 kV power network system in underground mine is analyzed. The withstand voltage of the 3.3 kV mine-used motor＇s insulated system is calculated and the rated parameters of RC-snubbers and varistor are also determined. Finally, the voltage protection system composed of transient overvoltage part and steady voltage part is designed. Tested results indicate that this system can realize the protection function when voltage fault occurs, and it runs steadily and reliably.