【摘要】 为了解双端接地时影响二次电缆芯线-屏蔽层电位差的各参数作用大小,及其各参数与芯线-屏蔽层电位差之间的线性程度,通过Matlab编程对电缆芯线-屏蔽层电位差进行计算分析,将二次电缆芯线-屏蔽层电位差作为目标函数,在函数定义区间内进行各个参数灵敏度分析。计算表明:接地网导体间距参数灵敏度较大,对芯线-屏蔽层电位差的影响作用最强,两者变化情况呈非线性关系,是优化设计的主要考虑因素;地网边长、电缆长度的参数灵敏度系数相对较小,可以在合理的范围内改变这两个参数进行优化,但效果不大;土壤电阻率参数灵敏度较小,芯线-屏蔽层电位差对其变化不敏感,不建议通过土壤电阻率对芯线-屏蔽层电位差进行优化设计。更多还原

【Abstract】 In order to research the degree of influencing factors on two-end grounded secondary cablesand the linear relation between them,the software called Matlab is used to calculate and analysis the potential difference of core and sheath. The objective function is the potential difference of core and sheath,the sensitivity and relation analysis is based on the function’s domainin. The results show that the sensitivity of the relative parameters which have great influences on the potential difference of core and sheath is the spacing of grounding grid,and the relation between them is nonlinear; the spacing of grounding grid should be the first consideration about the optimization. The sensitivity of the side length of grounding grid and the length of cable are smaller compared to the maximum,which can be made reasonable changes,but the affection is limited. The sensitivity of the soil resistivity is bitty and has less affection on the potential difference of core and sheath,which is not recommended tooptimize the potential difference of core and sheathby changing soil resistivity.更多还原