变压器绝缘油中氦气组分的确认及浓度的测试

Determination on Helium Component in Insulating Oil of Transformer and Testing of Its Concentration

目前由于变压器安装的在线色谱仪需要用氦气等气体作为载气,在线色谱仪工作时,一部分氦气会溶解于绝缘油中。当采用气相色谱法测定绝缘油中溶解的甲烷、乙烯、乙烷、乙炔、氢气等故障气体时,氦气与氢气的保留时间非常接近,易将氦气误认为氢气,导致测试结果错误,给生产带来不必要的麻烦。由于基层单位对氦气浓度的测试工作尚未开展,现对变压器绝缘油中氦气的确认及其浓度的测试方法进行阐述。

At present, because transformer is installed with on - line chromatograph which takes helium or other gases as carri- er gas, so when on - line chromatograph is working, a part of helium is dissolved in the insulating oil. When gas chromato- graphic method is adopted to determine the dissolved methane, ethylene, ethane, acetylene, hydrogen and other gases in insu- lating oil, the retention time of helium and hydrogen is very close to each other, so it often takes helium to be hydrogen, which leads to a wrong test result. As the basic - level unit has not carried out the test of helium concentration, the determination on helium in transformer insulating oil will be described as well as the method for testing the concentration of helium.