直流XLPE电缆用预制接头最大场强解析算法

doi:10.11930/j.issn.1004-9649.202004207

中国电力 ›› 2020, Vol. 53 ›› Issue (9): 157-165.DOI: 10.11930/j.issn.1004-9649.202004207

• 高压电缆及附件关键技术专栏 • 上一篇下一篇

直流XLPE电缆用预制接头最大场强解析算法

刘英, 赵明伟, 陈嘉威

西安交通大学电气工程学院，陕西西安 710049

收稿日期:2020-04-25 修回日期:2020-06-16 发布日期:2020-09-09
作者简介:刘英(1976—)，女，通信作者，博士，副教授，从事高压绝缘结构设计、电力电缆工程计算及应用研究，E-mail：candyly@xjtu.edu.cn;赵明伟(1997—)，男，硕士研究生，从事直流电缆附件的结构设计及工程应用研究，E-mail：970278044@qq.com;陈嘉威(1995—)，男，硕士研究生，从事高压电缆的结构设计及工程应用研究，E-mail：1019623584@qq.com
基金资助:
国家自然科学基金资助项目(XLPE绝缘材料对交流和直流电压耐受的互易性研究，51777156)

An Analytical Solution for Maximum Field Strength at the Pre-fabricated Joints of DC XLPE Cables

LIU Ying, ZHAO Mingwei, CHEN Jiawei

School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China

Received:2020-04-25 Revised:2020-06-16 Published:2020-09-09
Supported by:
This work is supported by National Natural Science Foundation of China (Research on the Reciprocity Between AC and DC Voltage Endurance Characteristics of XLPE Insulating Materials, No.51777156)

摘要/Abstract

摘要： 由于电缆接头结构复杂并含有多个复合界面，对其进行直流电场分析通常需要借助数值仿真软件、采用电-热耦合方法进行迭代计算，耗时费力。为了满足工程中仅对中低压直流XLPE电缆用中间接头最大场强进行校核的需求，利用传热学与电磁学相关理论，建立接头热场分布的简化分析模型，推导出计算应力锥根部场强的解析式，仅需输入少量必要参数，即可确定接头中的最大场强。通过以10 kV和35 kV XLPE电缆用硅橡胶和乙丙橡胶接头为例，分别在不同直流电压及接头内外温差下进行解析计算，并与相应的有限元仿真结果对比，验证所提方法的计算精度及适用性，为工程人员进行中低压直流预制接头的设计及校核提供强有力工具。

关键词: 中低压直流, XLPE电缆, 预制接头, 最大场强, 解析计算方法, 仿真分析

Abstract: Due to the complex structure and multiple composite interfaces of the cable joints, the DC electric field distribution is usually analyzed by means of a numerical simulation software, which uses the electric-thermal coupling method for iterative calculation, and is time-consuming. In order to evaluate the maximum field strength at the joint for medium and low voltage DC XLPE cables, a simplified analytical solution was presented. Based on the theories of heat transfer and electromagnetics, a simplified model was established for analyzing the thermal field distribution at the cable joint, and an analytical formula was derived for calculating the field strength at the foot of the stress cone, with which only a few necessary parameters are needed to determine the maximum field strength at the joint. In this paper, by taking the prefabricated joints of silicone rubber and ethylene-propylene rubber for the 10 kV and 35 kV XLPE cables as an example, analytical calculations were carried out under different DC voltages and temperature differences between the joint inside and outside, and the analytical results were compared with those from the finite element simulation. The consistence between them verifies the accuracy of the proposed analytical solution and its applicability for the design and evaluation of the medium and low voltage DC cable pre-fabricated joints in practical projects.

Key words: medium and low voltage DC, XLPE cable, pre-fabricated joint, maximum field strength, analytical calculation method, simulation analysis

刘英, 赵明伟, 陈嘉威. 直流XLPE电缆用预制接头最大场强解析算法[J]. 中国电力, 2020, 53(9): 157-165.

LIU Ying, ZHAO Mingwei, CHEN Jiawei. An Analytical Solution for Maximum Field Strength at the Pre-fabricated Joints of DC XLPE Cables[J]. Electric Power, 2020, 53(9): 157-165.

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直流XLPE电缆用预制接头最大场强解析算法

An Analytical Solution for Maximum Field Strength at the Pre-fabricated Joints of DC XLPE Cables

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直流XLPE电缆用预制接头最大场强解析算法

An Analytical Solution for Maximum Field Strength at the Pre-fabricated Joints of DC XLPE Cables

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