【摘要】 由于三峡电站地处高电阻率地带,且入地故障电流很大。初步计算[2]表明,其接地装置的设计很难满足标准中规定的地电位升高不大于2000V[1]。为了确定提高地网允许电位升高值是否可行,作者对影响该值的因素之一控制电缆的工频耐压特性进行了试验研究,得出了一些有用的结论。更多还原

【Abstract】 The Three Gorges Hydroelectric Power Station is located at the region with high resistivity of soil and the currents entering the ground caused by faults are rather intense. The calculation results from preliminary calculations in reference [2] show that for the grounding mesh of Three Gorges Hydroelectric Power Station the requirement in the standard DL/T 621-1997 of the grounding of AC electrical equipments, that is *the rise of ground potential should not be higher than 2000V*is difficult to satisfy.To determine whether it is possible or not to increase the value of the tolerable ground potential rise, one factor influencing the tolerable ground potential rise is the power frequency voltage withstanding characteristics of control cable. It is tested and researched and some useful conclusions are obtained.更多还原