水分和溫度對FDS低頻介損的影響研究
張曉林1,任喬林2,張濤1,肖灑2
(1 三峽大學 電氣與新能源學院,湖北 宜昌 443002;2 國網湖北省電力公司孝感供電公司,湖北 孝感 432100)
摘 要:FDS方法能有效地評估水分和溫度對變壓器油紙絕緣系統的影響,尤其是低頻介損更能有效反應其絕緣狀態。在實驗室完成試品的制備以模擬變壓器油紙絕緣系統,試驗研究了水分和溫度對f=0.1 mHz的低頻介質損耗tanδ 的影響,并通過最小二乘法分別將水分含量和測試溫度與特征頻率處的介質損耗tanδ進行擬合,得到相應的擬合關系。試驗結果表明:低頻f=0.1 mHz處的介質損耗tanδ隨著水分和溫度的上升呈指數函數增長,且其增長速率不斷增大。該方法準確直觀地評估了水分和溫度對低頻介損的影響,對準確診斷變壓器油紙絕緣老化狀態具有參考價值。
關鍵詞:變壓器;油紙絕緣;水分;溫度;頻域介電譜;介質損耗;低頻介損
中圖分類號:TM835.4 文獻標識碼:A 文章編號:1007-3175(2017)11-0048-04
Influence Study of Moisture and Temperature on Low Frequency Dielectric Loss of Frequency
Domain Dielectric Spectroscopy
ZHANG Xiao-lin1, REN Qiao-lin2, ZHANG Tao1, XIAO Sa2
(1 College of Electrical Engineering and New Energy, Three Gorges University, Yichang 443002, China;
2 Xiaogan Electric Power Supply Company of State Grid Hubei Electric Co., Ltd, Xiaogan 432100, China)
Abstract: The frequency domain dielectric spectroscopy (FDS) method can effectively evaluate the influence of moisture and temperature on the oil paper insulation system of transformer, especially low-frequency dielectric loss, which can effectively reflect the insulation state. This paper studied on the influence of moisture and temperature on the low-frequency dielectric loss tanδ of f=0.1 mHz. The moisture content and the test temperature were fitted with the dielectric loss tanδ at the characteristic frequency by the least squares method respectively and the corresponding fitting relation was also obtained. The experimental results show that the dielectric loss tanδ at low frequency (f=0.1 mHz) increases with the increase of moisture content and test temperature, and its growth rate is also increasing. This method can not only evaluate the influence of moisture and temperature on the low frequency dielectric loss accurately and intuitively, but also provide some reference value for the diagnosis of the aging state of transformer oil paper insulation.
Key words: transformer; oil paper insulation; moisture; temperature; frequency domain dielectric spectroscopy; dielectric loss; low frequency dielectric loss
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