用红外光谱法测试绝缘油中的 T501 含量

Measurement of T501 content in insulation oil by infrared spectrum

运行中的变压器油由于受氧气、水份、温度等因素的影响，变压器油会逐渐产生变质而老化，为了延长绝缘油的使用寿命，国产变压器油中加有抗氧化剂Ｔ５０１。为了提高我局油务监督水平，及时补加绝缘油在运行中消耗掉的Ｔ５０１，文章选用红外光谱法测定绝缘油中的Ｔ５０１含量。以酚羟基［－ＯＨ］，在３６５０ｃｍ－１处的吸收峰作为Ｔ５０１的特征吸收峰，对试验方法所用的吸收池的材料、光程、背景、分辨率，吸光度的测量方法，扫描次数等参数进行了试验。选用溴化钾材质窗片，光程为０．４—０．６ｍｍ，光程片为聚四氟乙烯材料，吸收池架采用美国ＰＥ公司可拆装吸收架。该方法经过精密度及回收率考察，平行试验误差在０．０３％以下，回收率大于９５％。该方法的主要优点是：简便、快速、准确度高。

The transformer oil in service will deteriorate under the effect of the several factors such as oxygen,water,temperature and etc.The antioxidant T501 is added into th oil to extend the srvice Life of the transformer oil.In this paper the writer proposes a method to measure T501 content in transformer oil by infrared spectrum.The feature of the method proposed is to take the absorb peak of the phenolic hydroxyl as the characteristic absorb peak of the T501 antioxidant.And some important experiment results are given in this paper.