超高压交联电缆户外终端的热状态评价方法

发布时间：2018-05-10 09:18

  本文选题：超高压 + 电缆　； 参考：《高电压技术》2017年02期

【摘要】：超高压(EHV)交联聚乙烯(XLPE)电缆户外终端的绝缘故障对电网的运行稳定性有重大影响,有效地评价其热状态对预判其绝缘故障有重要意义。为研究超高压XLPE电缆户外终端的热状态评价方法,分析了超高压XLPE电缆户外终端表面的热场分布特性,提出了以超高压电缆户外终端表面的最大温差为依据的热状态评价方法。按照IEC 62067:2011和GB/T 22078—2008标准要求,设计并运行了500 kV交联电缆系统的预鉴定试验。在不同环境温度下,采用红外热成像方式分析了户外终端表面的热场分布特性。结果表明:评价超高压电缆户外终端表面的最大温差,可有效减少外界环境变化对户外终端热场分析的干扰;热状态良好的超高压电缆户外终端的表面最大温差值Δθ≈1℃,热状态不良的超高压电缆户外终端的表面最大温差值Δθ1℃,Δθ值偏大提示户外终端的热状态异常。试验验证了所提出超高压交联电缆户外终端热状态评价方法的有效性。
[Abstract]:The insulation failure of the outdoor terminal of the EHVXLPE) cable has a great influence on the stability of the power network. It is important to evaluate the thermal state of the cable effectively and to predict the insulation fault. In order to study the thermal state evaluation method of UHV XLPE cable outdoor terminal, the thermal field distribution characteristics of UHV XLPE cable outdoor terminal surface are analyzed, and a thermal state evaluation method based on the maximum temperature difference of UHV cable outdoor terminal surface is proposed. According to the requirements of IEC 62067: 2011 and GB/T 22078-2008, the pre-appraisal test of 500kV cross-linked cable system is designed and run. The thermal field distribution characteristics of outdoor terminal surface were analyzed by infrared thermal imaging under different ambient temperatures. The results show that evaluating the maximum temperature difference of the outdoor terminal surface of UHV cable can effectively reduce the interference of the external environment change to the analysis of the thermal field of the outdoor terminal, and the maximum temperature difference value 螖 胃 鈮，

本文编号：1868738