水分對變壓器油紙絕緣系統(tǒng)老化速率的影響研究
汪旭旭
(國家電網(wǎng)有限公司特高壓建設(shè)分公司，北京 100032)
摘 要：油紙絕緣的老化進程在極大程度上會受到水分的影響，為精準研判水分對其老化速率的影響，在實驗室創(chuàng)造試驗所需材料和條件制備了 1%、2.5%、4% 3 種不同水分含量的試品，并對 3 種試品開展加速熱老化，且時間均控制為 0、10、20、30、40 天。在清晰掌握多種能夠反映油紙絕緣狀況特征參數(shù)的前提下選取聚合度來研判水分對油紙絕緣老化速率的影響。研究結(jié)果表明：隨著水分含量的增加，平均降解速率k 會增大，而且 k 的增速從 1% 增加至 2.5% 時明顯比從 2.5% 增加到 4% 時要大得多。該法為精準分析油紙受潮狀態(tài)，研判變壓器剩余運行時長提供了一定參照。
關(guān)鍵詞：變壓器；油紙絕緣；聚合度；水分；平均降解速率；增速
中圖分類號：TM411 文獻標識碼：A 文章編號：1007-3175(2021)07-0048-04
Research on the Influence of Moisture on the Aging Rate of
Transformer Oil-Paper Insulation System
WANG Xu-xu
（The UHV Construction Branch of State Grid Corporation, Beijing 100032, China）
Abstract: Aging process of oil-paper insulation is affected by moisture at a large extent. To estimate the effects of moisture on the aging rate of oil-paper insulation accurately, three kinds of samples with different moisture rates at 1%, 2.5% and 4% were performed for the thermal aging experiment over the period of 0, 10, 20, 30 and 40 days. In this research, the degree of polymerization was selected to analyze the effects of moisture on the aging rate of oil-paper insulation on the basis of that other parameters reflecting the situation of oil paper were in control. Finally, the results indicated that the average degradation rate named as k increases with the water content increasing, and the growth of k with the moisture rate at 1% to 2.5% is much higher than that with the moisture rate at 2.5% to 4%. Lastly, the conclusion provides some reference for estimating the remaining operation time of transformers according to the oil-paper damped states.
Key words: transformer; oil-paper insulation; degree of polymerization; moisture; average degradation rate; growth rate
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