退役高压XLPE电缆绝缘空间电荷行为研究  

Space charge behavior of retired high-voltage XLPE cables

作　　者：赵一枫 刘刚[1] 谢月[1] 黄嘉盛 朱宁西[1] ZHAO Yifeng;LIU Gang;XIE Yue;HUANG Jiasheng;ZHU Ningxi(School of Electric Power,South China University of Technology,Guangzhou 510640,China;Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Guangzhou 510310,China)

机构地区：[1]华南理工大学电力学院,广东广州510640 [2]广东电网有限责任公司广州供电局,广东广州510310

出　　处：《电力工程技术》2020年第3期151-157,172,共8页Electric Power Engineering Technology

基　　金：中国南方电网有限责任公司科技项目(GZM2015-1-0012)。

摘　　要：文中对两回110 kV退役高压交联电缆进行180 a预鉴定试验,目的在于研究不同运行年限的退役高压交联电缆老化前后的空间电荷行为差异,并评估电缆重新投入实际运行的可靠性。通过电声脉冲(PEA)法测量试验前后绝缘层交联聚乙烯(XLPE)试样的空间电荷分布,结合傅里叶红外光谱(FTIR)实验、X射线衍射(XRD)实验揭示试样的微观结构、聚集态结构状态变化与空间电荷的迁移、积聚和消散过程的潜在关系。实验结果表明:实际运行16 a的电缆绝缘由于存在大量杂质使得空间电荷的积聚严重,老化试验后,杂质的减少和淬火反应使得空间电荷的积聚降低且消散过程加快;实际运行32 a的电缆绝缘空间电荷的积聚和消散过程缓和,老化试验后,由于绝缘降解作用和晶态结构的破坏使得空间电荷的积聚加剧且消散过程变得缓慢。Two retired high-voltage cross-linked cables with service years of 16 and 32 are chosen to conduct a 180-day prequalification test to research the diversity of space charge behavior and evaluate the reliability of reusing these cables for practical operation.Space charge behavior in cross-linked polyethylene(XLPE)insulation of the samples before and after aging test is tested by the pulse electro acoustic(PEA)method,and space charge characteristics of the samples is investigated.Fourier transform infrared spectroscopy(FTIR)and X-ray diffraction(XRD)experiments are used to observe changes on micro-structure and aggregation structure of each sample.Experiments reveal the potential relationship between the structural changes and space charge behavior,including the characteristic of migration,accumulation and dissipation of space charge.The results show that the impurities causing severe accumulation of space charge inside the samples of the cable with 16 service years.After the accelerated aging test,reduction of impurities and annealing effect decreases the accumulation of space charge and speeds up dissipation process.On the contrary,the accumulation and dissipation of space charge inside the cable with 32 service years is moderate.After the accelerated aging test,the oxidative degradation and destruction of crystalline structure result in aggravation of space charge accumulation and more moderate dissipation process of space charge.

关 键 词：电缆 交联聚乙烯(XLPE) 空间电荷 傅里叶红外光谱(FTIR) X射线衍射(XRD) 陷阱 

分 类 号：TM247[一般工业技术—材料科学与工程]