發(fā)布時間：2018-03-28 22:24

  本文選題：油紙絕緣　切入點(diǎn)：甲酸　出處：《高電壓技術(shù)》2014年05期

【摘要】：為研究有機(jī)酸對油紙絕緣熱老化及頻域介電譜(FDS)的影響,在絕緣油中分別添加甲酸和硬脂酸至油中酸值均達(dá)到0.3×10-3(即中和1 g該絕緣油需0.3 mg KOH),再將初始水分質(zhì)量分?jǐn)?shù)σmc分別為0.2%和3.0%的絕緣紙置于不同的絕緣油試品中,測試不同溫度下有機(jī)酸在油和紙之間的分布特性(采用酸的擴(kuò)散特性和溶解特性來表征)。當(dāng)有機(jī)酸達(dá)到穩(wěn)態(tài)后,分別在20℃和70℃下對不同試品進(jìn)行FDS測試,分析試品復(fù)介電常數(shù)實(shí)部ε'和虛部ε''的變化規(guī)律;再分別在70℃和100℃下對試品進(jìn)行加速熱老化試驗(yàn),分析老化過程中的絕緣紙聚合度的變化趨勢和老化機(jī)理。結(jié)果表明,甲酸易溶于絕緣紙,硬脂酸易溶于絕緣油。溫度和σmc對酸在油紙絕緣中溶解特性的影響很小,但溫度的升高會加速酸的擴(kuò)散。甲酸對絕緣紙的老化具有顯著影響,而硬脂酸基本無影響。低溫時,甲酸對ε'和ε''均具有顯著影響,而硬脂酸只對干燥絕緣紙的ε''具有顯著影響;高溫時,甲酸和硬脂酸分別對ε''和ε'的影響較大。因此利用FDS法評估油紙絕緣中的σmc時,需充分考慮有機(jī)酸的影響。
[Abstract]:In order to study the effect of organic acids on thermal aging and frequency domain dielectric spectrum (FDS) of oil-paper insulation, Adding formic acid and stearic acid to the insulating oil respectively reached 0.3 脳 10 ~ (-3) acid value (that is, neutralizing 1 g of the insulating oil required 0.3 mg KOHN), and then placing the insulator paper whose initial moisture content 蟽 _ (m _ c) was 0.2% and 3.0% respectively in different insulating oil samples. The distribution of organic acids between oil and paper was measured at different temperatures (the diffusion and dissolution characteristics of acids were used to characterize the organic acids. When the organic acids reached steady state, FDS tests were carried out at 20 鈩，

本文編號：1678347