基于FDS區(qū)分熱老化和水分對油紙絕緣狀態(tài)的影響研究
張可迪,胡康,劉翔
(國網湖北省電力有限公司孝感供電公司,湖北 孝感 432100)
摘 要:為區(qū)分熱老化和水分對頻域介電特性的影響,將FDS法應用于變壓器主絕緣的老化和受潮狀態(tài)評估。通過絕緣診斷儀對制備的老化和水分試品進行FDS測量,提取1 mHz及0.1 mHz為老化試品特征頻率,100 Hz、1 kHz為水分試品特征頻率,利用特征頻率處的tanδ區(qū)分老化和水分對頻域介電特性的影響,并給出了特征頻率處tanδ與聚合度以及水分含量的定量擬合關系。研究結果表明:聚合度和水分含量與特征頻率處的tanδ均呈指數函數關系,tanδ隨著聚合度增大而減小,隨著水分含量的增大而增大。
關鍵詞:變壓器;油紙絕緣;頻域介電譜;熱老化;水分;特征頻率;介質損耗
中圖分類號:TM406 文獻標識碼:A 文章編號:1007-3175(2019)05-0058-04
Study on Differentiating Effect of Thermal Aging and Moisture on Oil Paper Insulation Based on FDS
ZHANG Ke-di, HU Kang, LIU Xiang
(Xiaogan Electric Power Supply Company of State Grid Hubei Electric Co., Ltd, Xiaogan 432100, China)
Abstract: In order to distinguish the effects of heat aging and moisture on the dielectric properties of the frequency domain, the FDS method was applied to evaluate the aging and damp state of the transformer main insulation. The aging and moisture samples were measured by FDS with insulation diagnostic instrument. The characteristic frequencies of aging samples were extracted at 1 mHz and 0.1 mHz, and the characteristic frequencies of moisture samples were 100 Hz and 1 kHz. The tanδ at the characteristic frequency was used to distinguish the effects of aging and moisture on frequency domain dielectric properties. This paper gave the quantitative fitting relationship between tanδ at the characteristic frequency and the degree of polymerization and moisture content. The results show that the degree of polymerization and moisture content are exponentially related to tanδ at the characteristic frequency. The tanδ decreases with the increase of polymerization degree and increases with the increase of water content.
Key words: transformer; oil paper insulation; frequency domain dielectric spectroscopy; thermal aging; moisture; characteristic frequency; dielectric loss
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