含水量和溫度對變壓器油介電性能的影響
劉麗嵐1，彭宗仁1，王柱2，陳紅日2
（1 西安交通大學 電力設備電氣絕緣國家重點實驗室，陜西 西安 710049；2 國網電力科學研究院武漢南瑞有限責任公司，湖北 武漢 430074）
摘 要：變壓器油是油浸式電力變壓器中重要的液體絕緣介質，水分是除溫度以外影響變壓器絕緣最重要的因素之一。搭建了高溫高壓介電譜測試系統，應用頻域介電譜法研究不同含水量和溫度下變壓器油的相對介電常數和介損因數隨頻率的變化規律；根據測試數據進一步推導直流電導率，得到了含水量、溫度與直流電導率之間的定量關系，為變壓器油的含水量診斷提供依據。
關鍵詞：變壓器油；含水量；頻域介電譜；直流電導率
中圖分類號：TM411 文獻標識碼：A 文章編號：1007-3175(2018)03-0029-04
Effects of Moisture and Temperature on Dielectric Properties of Transformer Oil
LIU Li-lan1, PENG Zong-ren1, WANG Zhu2, CHEN Hong-ri2
（1 State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China;
2 Wuhan Nari Co., Ltd, State Grid Electric Power Research Institute, Wuhan 430074, China）
Abstract: Transformer oil is the important liquid insulating dielectric of oil-immersed power transformer. With the exception of temperature, moisture is considered to be one of the most important factors of influence on the transformer insulation. This paper established the high temperature and high voltage dielectric spectroscopy test system and studied on the dependence of frequency on relative permittivity and dielectric loss factor of transformer oil with different moisture content and temperature, based on the frequency domain spectroscopy (FDS) method. According to the test data, the direct current (DC) conductivity was further deduced, and the quantitative relationship among moisture content, temperature and DC conductivity was obtained to provide the basis for the diagnosis of moisture content of transformer oil.
Key words: transformer oil; moisture content; frequency domain spectroscopy; direct current conductivity
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