摘要
采煤机拖拽电缆在实际运行中常受到电、热、机械应力的共同作用,致使其绝缘性能变差。为了能掌握力热应力同时作用下采煤机拖拽电缆用乙丙橡胶绝缘的性能,文中测量了挤压力与温度作用下乙丙橡胶的介电频谱,并研究了其复介电常数和复电导率实部受温度和挤压力的影响规律。随后用Havriliak-Negami函数拟合了复介电常数虚部频谱,并提取了函数模型的特征参数,分析了特征参数与温度和挤压力的关系。结果表明:乙丙橡胶绝缘的复介电常数和复电导率实部不仅与温度和频率密切相关,复介电常数还与挤压力相关,而复电导率实部与挤压力负相关。乙丙橡胶绝缘的复介电常数虚部频谱满足Havriliak-Negami函数,分析特征参数可得出,温度对直流电导率的影响和挤压力对损耗强度的影响是造成乙丙橡胶绝缘复介电常数变化的原因。
The towing cable for coal cutters is always subjected to the joint effects of electric,thermal and mechani⁃cal stresses in actual operation,which severely deteriorates its insulation performance.In order to be able to master the insulation performance of ethylene propylene rubber(EPR)for the towing cable of coal cutter under simultane⁃ous action of mechanical and thermal stress,the the dielectric spectroscopy of the EPR under the action of the ex⁃trusion force and temperature is measured in this paper,and the influence of temperature and extrusion force on the real part of complex permittivity and complex conductivity of EPR is studied.Then,the spectroscopy of imagi⁃nary part of complex permittivity is fitted by Havriliak⁃Negami function,the characteristic parameters of the Havril⁃iak⁃Negami function are extracted and the relationship among the characteristic parameters,temperature and the extrusion force is analyzed.The result shows that the complex permittivity and the real part of complex conductivity of EPR are not only closely related to temperature and frequency,but the complex permittivity is also related to ex⁃trusion force and the real part of the complex conductivity is to negatively related to the extrusion force.The imagi⁃nary part of complex permittivity of EPR is in good agreement with the Havriliak⁃Negami function.It is concluded from the analysis of the characteristic parameters that the influence of temperature on DC conductivity and of the ex⁃trusion force on loss strength is the main cause leading to complex permittivity variation of EPR insulation.
作者
刘兆贵
雷志鹏
王业
石志杰
韩坤莹
王思宇
刘洋
LIU Zhaogui;LEI Zhipeng;WANG Ye;SHI Zhijie;HAN Kunying;WANG Siyu;LIU Yang(Shanxi Key Laboratory of Mining Electrical Equipment and Intelligent Control,National&Provincial Joint Engineering Laboratory of Mining Intelligent Electrical Apparatus Technology,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《高压电器》
CAS
CSCD
北大核心
2024年第10期129-136,共8页
High Voltage Apparatus
基金
国家自然科学基金(51977137)。
关键词
乙丙橡胶
介电谱
温度
挤压力
电缆
EPR
dielectric spectroscopy
temperature
extrusion force
cable
