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首页> 外文会议>IEEE International Symposium on Electrical Insulation >Comparison between headspace and vacuum gas extraction techniques for the gas chromatographic determination of dissolved gases from transformer insulating oils
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Comparison between headspace and vacuum gas extraction techniques for the gas chromatographic determination of dissolved gases from transformer insulating oils

机译：气相色谱法测定变压器绝缘油气色谱法测定气相色谱法测定的比较

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摘要

The conventional headspace sampling technique is highly efficient for analyzing dissolved gases in transformer oil apart from the relatively long time that the analytes take to equilibrate between the sample and vapor phases. By mixing the sample during the equilibration period, the equilibration time was shortened by a factor of 15. Under these conditions, analysis of the gases of the first sample is completed in 32 min, while analysis of each subsequent sample takes only 20 min. The results of the analysis of dissolved-gas standards by the headspace sampling technique were compared to those obtained by four labs using the ASTM D3612 method. Our technique compares well to the vacuum gas extraction technique with a number of accurate analyses higher than the best results obtained by the participating labs. An average relative standard deviation of 4% for all gases studied was observed. Excellent correlation between the results of the analysis of 80 transformer oil samples by these two techniques was noted for all gases of interest.
机译：传统的顶空抽样技术对于分析在样品和蒸汽相之间的相对较长的时间内分析变压器油中的溶解气体是高效的。通过在平衡周期期间混合样品，将平衡时间缩短为15倍。在这些条件下，在32分钟内完成第一样品的气体的分析，而每个后续样品的分析只需要20分钟。将顶空抽样技术分析溶解气标准的结果与使用ASTM D3612方法获得的四种实验室获得的结果。我们的技术与真空气体提取技术相比，许多精确分析高于参与实验室获得的最佳结果。观察到所有研究的所有气体的平均相对标准偏差为4％。对这两种技术的80种变压器油样品分析结果之间的良好相关性对所有感兴趣的气体都被注意到了。

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