溶解气体分析
变压器
可再生能源
变压器油
发电
电
环境科学
工艺工程
石油工程
电气工程
工程类
功率(物理)
热力学
电压
物理
作者
Huize Cui,Liuqing Yang,Yuanwei Zhu,Liuqing Yang,Ahmed Abu‐Siada,Syed Islam
出处
期刊:IEEE Transactions on Dielectrics and Electrical Insulation
[Institute of Electrical and Electronics Engineers]
日期:2021-08-01
卷期号:28 (4): 1349-1356
被引量:11
标识
DOI:10.1109/tdei.2021.009490
摘要
In this paper, a series of laboratory experiments are conducted to investigate the effect of momentary small variations in the transformer operating temperature on the dissolved gas analysis (DGA) measurement. With the increased penetration level of renewable energy sources of intermittent characteristics into electricity grids, operating power transformers are expected to experience frequent temperature variations. Sampling transformer oil during such temperature variation leads to inaccurate diagnosis. Experimental results reveal that gas evolution in transformer oil is greatly affected by the small variations in the operating temperature. Such small variation can be a result of the intermittent generation characteristics of renewable energy sources. Hence, false analysis may be reported if oil is sampled during generation or load fluctuation events. Experimental results are explained through chemical equilibrium constant theory, which indicates that dissolved gases reflect the change in aging rate of the transformer oil-paper insulation system. These results suggest a new paradigm for DGA process through correlating measurements with the transformer operating temperature through the generation and load profiles at the instant of oil sampling.
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