基于FDS法研究水分含量對(duì)特征頻率處介質(zhì)損耗的影響
劉翔,張可迪,胡康
(國(guó)網(wǎng)湖北省電力有限公司孝感供電公司,湖北 孝感 432100)
摘 要:為研究水分對(duì)油紙絕緣系統(tǒng)的影響,分別在30 ℃和60 ℃下對(duì)試驗(yàn)室制備的試品進(jìn)行頻域介電譜(FDS)測(cè)量,通過(guò)對(duì)所得試驗(yàn)結(jié)果進(jìn)行分析,選取特征頻率處的介質(zhì)損耗和水分含量進(jìn)行擬合,并獲得相關(guān)的擬合關(guān)系。研究表明:水分含量和特征頻率處的介質(zhì)損耗呈指數(shù)函數(shù)關(guān)系,隨著水分含量的增大介質(zhì)損耗也增大,其增長(zhǎng)速率也逐漸增大,且頻率越小其增長(zhǎng)速率越大;在同一特征頻率處,溫度越高介質(zhì)損耗的增長(zhǎng)速率越大。
關(guān)鍵詞:變壓器;油紙絕緣;頻域介電譜;水分含量;特征頻率;介質(zhì)損耗;溫度
中圖分類(lèi)號(hào):TM403.3;TM855 文獻(xiàn)標(biāo)識(shí)碼:B 文章編號(hào):1007-3175(2019)02-0048-04
Effect of Moisture Content on Dielectric Loss at Characteristic Frequency Based on FDS Method
LIU Xiang, ZHANG Ke-di, HU Kang
(Xiaogan Electric Power Supply Company of State Grid Hubei Electric Power Co., Ltd, Xiaogan 432100, China)
Abstract: To accurately assess the effect of moisture on the oil-paper insulation system of transformer, the influence of moisture was studied at 30 °C and 60 °C by FDS method respectively. Through the analysis of the obtained test results, the dielectric loss and moisture content at characteristic frequency were selected to carry out fitting and to obtain the relevant fitting relationship. The research results show that the moisture content and the dielectric loss at the characteristic frequency are exponentially related. With the increase of moisture content, the dielectric loss also increased, and its growth rate also increased, moreover, the smaller the frequency, the greater the growth rate. The rate growth of dielectric loss increases with the increase of temperature at the same characteristic frequency.
Key words: transformer; oil paper insulation; frequency domain dielectric spectroscopy; moisture content; characteristic frequency; dielectric loss; temperature
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