The induced electricity of 110 kV transmission lines which cross the UHV AC transmission lines may threaten personal safety of the maintenance staff. In this paper, field measurement of the induced voltage and induced...The induced electricity of 110 kV transmission lines which cross the UHV AC transmission lines may threaten personal safety of the maintenance staff. In this paper, field measurement of the induced voltage and induced current on a 110 kV crossing line inside Jinhua in Zhejiang province is performed. The electrostatic induced voltage on the measured line is 12.24 kV. The power frequency electromagnetic field simulation model is established, and the calculation results are consistent with the measured. Influence factors analysis shows that the electrostatic induced voltage on the 110 kV line is 12.78 kV, the electromagnetic induced voltage is 12.3 V, the induced current through ground wire is less than 1A when the UHV lines operate at full load. The induced voltage and current decrease while the crossing distance increases. Parallel lines induction is much higher than crossing lines. The electromagnetic induced voltage after ground knife-switch shut down would exceed the human safety voltage 36 V while the crossing angle is less than 30?, so the temporary ground wire must be hanged to ensure safety of the maintenance staff.展开更多
利用有限元分析软件ANSYS,以跨越珠江的输电线路工程为研究背景,在输电塔上布置粘滞消能阻尼器和调谐质量阻尼器(tuned mass damper,TMD),对比分析了在三向El-Centro地震波作用下有、无减震控制措施的输电塔位移和加速度地震响应。通过...利用有限元分析软件ANSYS,以跨越珠江的输电线路工程为研究背景,在输电塔上布置粘滞消能阻尼器和调谐质量阻尼器(tuned mass damper,TMD),对比分析了在三向El-Centro地震波作用下有、无减震控制措施的输电塔位移和加速度地震响应。通过有关参数分析计算,分别得到了粘滞阻尼消能减震和调谐质量减震控制的最优粘滞阻尼系数和最优TMD质量,分析研究表明上述2种减震控制措施皆能明显衰减输电塔线体系的地震响应,具有比较理想的减震效果。展开更多
针对特高压交流线路下方交叉跨越的110 k V线路停运检修时可能出现感应电,对检修人员人身安全造成威胁的问题,文章对浙江金华境内110 k V交跨线路的感应电压和电流进行了现场实测,线路上产生的静电感应电压可达12.34 k V。提出对被感应...针对特高压交流线路下方交叉跨越的110 k V线路停运检修时可能出现感应电,对检修人员人身安全造成威胁的问题,文章对浙江金华境内110 k V交跨线路的感应电压和电流进行了现场实测,线路上产生的静电感应电压可达12.34 k V。提出对被感应线路进行分段,利用Matlab编程计算每一段的感应电压,最后叠加得到线路上感应电压的方法,计算结果表明:计算结果与实测结果非常接近,表明此种计算方法满足精度要求;交跨距离或交跨角度增大时,感应电压和电流会逐渐减小,实际工程中应尽量增大距离或角度,以减弱线路间的感应作用;为保证人身安全,线路检修时应将两侧变电站地刀接地,同时还需要在工作点两侧挂接临时接地线。展开更多
文摘The induced electricity of 110 kV transmission lines which cross the UHV AC transmission lines may threaten personal safety of the maintenance staff. In this paper, field measurement of the induced voltage and induced current on a 110 kV crossing line inside Jinhua in Zhejiang province is performed. The electrostatic induced voltage on the measured line is 12.24 kV. The power frequency electromagnetic field simulation model is established, and the calculation results are consistent with the measured. Influence factors analysis shows that the electrostatic induced voltage on the 110 kV line is 12.78 kV, the electromagnetic induced voltage is 12.3 V, the induced current through ground wire is less than 1A when the UHV lines operate at full load. The induced voltage and current decrease while the crossing distance increases. Parallel lines induction is much higher than crossing lines. The electromagnetic induced voltage after ground knife-switch shut down would exceed the human safety voltage 36 V while the crossing angle is less than 30?, so the temporary ground wire must be hanged to ensure safety of the maintenance staff.
文摘利用有限元分析软件ANSYS,以跨越珠江的输电线路工程为研究背景,在输电塔上布置粘滞消能阻尼器和调谐质量阻尼器(tuned mass damper,TMD),对比分析了在三向El-Centro地震波作用下有、无减震控制措施的输电塔位移和加速度地震响应。通过有关参数分析计算,分别得到了粘滞阻尼消能减震和调谐质量减震控制的最优粘滞阻尼系数和最优TMD质量,分析研究表明上述2种减震控制措施皆能明显衰减输电塔线体系的地震响应,具有比较理想的减震效果。
文摘针对特高压交流线路下方交叉跨越的110 k V线路停运检修时可能出现感应电,对检修人员人身安全造成威胁的问题,文章对浙江金华境内110 k V交跨线路的感应电压和电流进行了现场实测,线路上产生的静电感应电压可达12.34 k V。提出对被感应线路进行分段,利用Matlab编程计算每一段的感应电压,最后叠加得到线路上感应电压的方法,计算结果表明:计算结果与实测结果非常接近,表明此种计算方法满足精度要求;交跨距离或交跨角度增大时,感应电压和电流会逐渐减小,实际工程中应尽量增大距离或角度,以减弱线路间的感应作用;为保证人身安全,线路检修时应将两侧变电站地刀接地,同时还需要在工作点两侧挂接临时接地线。
