中文摘要：

电力电缆线路改造时容易造成换位的电缆三段不等长．从而引起护层电压不平衡．产生护层环流。在对电缆护层电压理论分析的基础上．推导了电缆几种主要排列方式下的护层感应电压数学模型；提出了电缆护层电压的补偿方法。该方法是在电缆终端增加一补偿电感．即在铁芯上绕制线圈，此线圈一端接电缆金属护层末端．另一端接地．基于这一补偿方法开发了补偿装置计算的软件包，并进行仿真计算，在此基础上研制了补偿装置。通过改变该补偿装置的气隙和匝数．可以对电缆护层电压进行有效补偿．使补偿后电缆护层的总电压大为减小，有效地抑制了护层环流．可大幅度降低电缆损耗．提高电缆传输容量。

英文摘要：

The reconstruction of power cable lines often makes the three segments of the transposed cable unequal in length,which causes the metal shield voltage unbalanced and produces shield circulating current. Based on theoretical analysis, the mathematic models of induced voltage under several main arrangement modes are deduced. The compensation method is put forward,which connects an inductance to the end of cable metal shield. It is a grounded winding on an iron core,and the corresponding compensation unit and simulation calculation software are developed. By changing air gap and turn number of the inductance,it reduces the induced voltage of metal shield efficiently and thus suppresses the circulating current,with cable loss lowered and transmission capacity enhanced.