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变压器绝缘纸中酸值测试及其时效老化特征
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详细介绍
纸中酸是反映和影响绝缘纸老化程度的重要因素,但是目前尚没有测量纸中酸值的标准方法。为此建立了变压器绝缘纸中酸值测量方法,即先用纯水将纸中小分子羧酸分萃取出来并制成萃取液,然后使用氢氧化钾的异丙醇溶液进行滴定,并采用BTB(溴百里香酚蓝)指示滴定终点,测量萃取液酸值进而计算纸中酸值。通过对比实验确定了纸中酸值测量的最佳温度(25 ℃)和萃取时间(6 h)等环境条件。对老化过程中油纸中酸值和水分进行测量发现,所测纸中酸值能较好地反映实际纸中酸值变化规律;纸中酸值与纸中水分变化趋势类似均随老化时间呈波动变化趋势;油纸中酸值并无明显相关关系。
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