电力变压器绝缘寿命评估的研究.pdfVIP

高电压与绝缘技术 ·1369 · 电力变压器绝缘寿命评估的研究 张 涛 蔡金锭 福州大学电气工程与自动化学院 福建 福州 3500022 【摘 要】 电力变压器绝缘的受潮和老化是其故障的主要因素，因此评估其绝缘寿命对确保电网的 全可靠运行具有重要意义。传统的化学分析方法需要在实验室环境下进行，有些甚至需要 获取变压器内部纸样。电介质响应测试方法是一种无损的绝缘诊断和寿命评估方法，已经 被用来评估变压器的绝缘状态，特别是评估绝缘纸板的水分含量，进而判断其老化程度。 本文讨论了水分含量和老化程度对变压器绝缘材料的影响，介绍了基于电介质理论的电压 响应测量方法的应用，验证了该方法评估变压器寿命的可靠性，并对获得的极化谱进行了 合理的解释。三台不同老化程度的变压器的研究结果表明，电压响应测试方法能够有效的 评估其老化程度，是一种可信的变压器绝缘寿命评估方法。 Study on Life Assessment of Power Transformer Insulation Zhang Tao Cai Jinding College of Electrical Engineering and Automation ，Fuzhou University ，Fuzhou 350002 ，Fujian ，China Abstract ：Moisture and aging degree of oil-paper insulated power transformer has a sure influence on its insulation property. Therefore ，it is an important way to insure power grid operating safely and stably by residual life assessment of power transformer. In this paper moisture content ，aging degree and their influence on transformer insulation are discussed. Although chemical analyses can provide direct information on parameters ，most chemical analyses must be performed under laboratory conditions and for some chemical analyses paper samples are needed. As a non-destructive diagnostic technique ，dielectric response measurements have been introduced for life assessment of transformer insulation ，especially for the evaluation of water content in transformer pressboard. Voltage response measurement is one of the effective life assessment method based on dielectric respons