摘要
三芯电缆沿线由于缺乏可靠的电源,电缆热状态的监测难以有效开展。提出并研制一种基于三芯电缆自取能技术的热状态评估系统。针对三芯电缆运行状态下电缆周围空间电磁场分布特征,采用了基于分裂绕组的三芯电缆取能技术,创新性地实现了三芯电缆非侵入式电磁感应取能;围绕三芯电缆取能线圈的输出特性,设计了低损耗AC-DC变换器,避免了由于开关损耗较大而导致取能失败的问题;建立了有限元模型,分析了电缆内部的温度分布;开展了实验验证,系统在电缆电流有效值为125 A的情况下可以获取峰值为248.3 mV的感应电压,满足系统正常运转的供电需求,建模评估得出的电缆温度分布与实测值误差小于2%,证明了该自取能式热状态评估系统的可行性和实用性。
This paper proposes the thermal condition evaluation system based on novel energy harvesting technique from three-core power cable line.A unique structure of three independent coils is designed to harvest the energy in a non-invasive way from the magnetic fields around three-core power cable lines.Considering the induced voltage fluctuation of the energy harvesting coils due to varying load currents,a low-loss AC-DC converter is designed and fabricated to ensure the stability of the power supply.In order to evaluate the inner temperature of power cables,a cable thermal model is built and analyzed using finite element method.A prototype of the proposed system is established and tested in the laboratory.Experiment is carried out on a three-core power cable,showing that the induced voltage could reach 248.3 mV at the cable current of 125 A,being sufficient to power the system.The error of the temperature evaluation is less than 2%.The experimental results prove the feasibility and effectiveness of the system for reliable temperature monitoring and thermal condition evaluation.The system lay the foundation for the application of distributed thermal condition evaluation in power Internet of things(IOT).
作者
南保峰
卢雨欣
孙廷玺
林钰灵
李洪杰
李军浩
NAN Baofeng;LU Yuxin;SUN Tingxi;LIN Yuling;LI Hongjie;LI Junhao(Zhuhai Power Supply Bureau,Guangdong Power Grid Co.,Ltd.,Zhuhai 519000,China;Xi’an Jiaotong Unviversity,Xi’an 710049,China)
出处
《智慧电力》
北大核心
2020年第11期103-107,共5页
Smart Power
基金
国家自然科学基金资助项目(51877169)
广东电网有限责任公司科技项目资助(GDKJXM20185371)。
关键词
三芯电缆
热状态
自取能
AC-DC变换器
电力物联网
three-core power cable
thermal condition
energy self-harvesting
AC-DC converter
power IOT
