单相高温超导电缆屏蔽层电流仿真及实验研究

高温超导电缆的屏蔽层在非对称故障情况下会在变电站间产生入地电流,影响系统的零序阻抗。采用数值模拟与实验相结合的方法,研究单相高温超导电缆的屏蔽层电流的影响因素。首先建立了超导电缆的电磁数值仿真模型,通过解析公式对模型进行验证,然后仿真计算不同屏蔽层等效电阻下,屏蔽层感应电流和感应电压大小。结果表明,感应电流和感应电压的主要影响因素是屏蔽层电阻的大小,且屏蔽层与导电层间的电磁关系可以采用变压器模型进行定性分析。同时,搭建了超导电缆屏蔽层电流的测试实验平台,初步验证了屏蔽层阻抗对屏蔽层电流的影响规律。

Simulation and Experimental Study of Screening Current of Single Phase High Temperature Superconducting Cable

Due to the existence of screening layer in HTS superconducting cable,fault current would be induced be?tween power stations,thus the protection strategy would be changed,compared to normal cables.In this paper,we study the factors which influence the screening currents,using numerical modeling and experimental techniques.Firstly,we establish the FEM model of single phase superconducting cable,which is verified by the analytic method.Then,we simulate the screening current and induced voltage under different resistance.It is found that the resistance within the screen circuit is the major factor of screen current and induced voltage.This kind of relationship can be de?scribed by the transformer model.Meanwhile,the experimental platform of screening current measurement is built to verify the relation between the resistance and screening current.