大电感电力电缆设计
发布时间：2018-09-06 08:24
【摘要】：电容电流过大是电力电缆线路最重要的问题之一。为减小电力电缆线路的对地电容电流,对传统电力电缆进行了创新设计,在电力电缆线芯外添加了磁粉层而成为大电感电力电缆。介绍了大电感电力电缆电感和电容的计算方法。建立了大电感电力电缆和传统电力电缆的ANSYS有限元仿真模型,对它们的导体电阻、绝缘电阻、电感、电容、集肤效应和涡流损耗进行了对比分析;建立了2种电力电缆的基于MATLAB的对地电容电流仿真模型,并对它们的对地电容电流和接地故障时的暂态电容电流进行了对比分析。结果表明:大电感电力电缆能够满足传统电力电缆的基本技术要求;根据磁粉量的大小不同,大电感电力电缆的单位长度电感值可达传统电力电缆的2~10倍,电容电流比传统电力电缆减小10%~20%,涡流损耗比传统电力电缆减小1%;并且磁粉层越厚,电容值就越小。因此,增加磁粉层,不仅能减少电容,从源头上减少电力电缆的电容电流,而且能降低电力电缆的集肤效应和涡流损耗。
[Abstract]:Excessive capacitive current is one of the most important problems in power cable lines. In order to reduce the earth capacitive current of power cable line, the traditional power cable is designed innovatively. A magnetic powder layer is added to the core of power cable to become a large inductance power cable. The calculation method of inductance and capacitance of power cable with large inductance is introduced. The ANSYS finite element simulation model of large inductance power cable and traditional power cable is established, and their conductor resistance, insulation resistance, inductance, capacitance, skin effect and eddy current loss are compared and analyzed. The ground capacitance current simulation model based on MATLAB for two kinds of power cables is established, and their earth capacitance current and transient capacitive current in grounding fault are compared and analyzed. The results show that the large inductance power cable can meet the basic technical requirements of the traditional power cable, and the inductance per unit length of the large inductance power cable can be 2 ~ 10 times that of the traditional power cable according to the size of magnetic particle. The capacitance current is 10 / 20 less than that of the traditional power cable, the eddy current loss is 1 / 10 less than that of the traditional power cable, and the thicker the magnetic powder layer, the smaller the capacitance. Therefore, the increase of magnetic powder layer can not only reduce the capacitance, the capacitance current of power cable from the source, but also reduce the skin effect and eddy current loss of power cable.
【作者单位】： 湖南大学电气与信息工程学院;中南大学;金杯电工股份有限公司;
【基金】：湖南省重大科技专项基金(06GK1003-1)~~
【分类号】：TM75
，
本文编号：2225780
[Abstract]:Excessive capacitive current is one of the most important problems in power cable lines. In order to reduce the earth capacitive current of power cable line, the traditional power cable is designed innovatively. A magnetic powder layer is added to the core of power cable to become a large inductance power cable. The calculation method of inductance and capacitance of power cable with large inductance is introduced. The ANSYS finite element simulation model of large inductance power cable and traditional power cable is established, and their conductor resistance, insulation resistance, inductance, capacitance, skin effect and eddy current loss are compared and analyzed. The ground capacitance current simulation model based on MATLAB for two kinds of power cables is established, and their earth capacitance current and transient capacitive current in grounding fault are compared and analyzed. The results show that the large inductance power cable can meet the basic technical requirements of the traditional power cable, and the inductance per unit length of the large inductance power cable can be 2 ~ 10 times that of the traditional power cable according to the size of magnetic particle. The capacitance current is 10 / 20 less than that of the traditional power cable, the eddy current loss is 1 / 10 less than that of the traditional power cable, and the thicker the magnetic powder layer, the smaller the capacitance. Therefore, the increase of magnetic powder layer can not only reduce the capacitance, the capacitance current of power cable from the source, but also reduce the skin effect and eddy current loss of power cable.
【作者单位】： 湖南大学电气与信息工程学院;中南大学;金杯电工股份有限公司;
【基金】：湖南省重大科技专项基金(06GK1003-1)~~
【分类号】：TM75
，
本文编号：2225780
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