研究目的
Investigating the use of normalized energy intensity (NEI) for assessing transformer fault severity through dissolved gas analysis (DGA).
研究成果
The NEI DGA scoring method, based on hydrocarbon fault gas concentrations and enthalpies of formation, provides a numeric fault severity score directly related to the amount of fault energy expended in the oil. It is sensitive to all IEC transformer fault types and responds better to gradual increases in fault severity. The method simplifies fault severity assessment by requiring only two or three NEI limits.
研究不足
The study focuses on mineral-oil-filled power transformers and does not address other types of transformers or insulating materials. The NEI method excludes hydrogen and carbon monoxide due to their production from non-fault processes and measurement variability.
1：Experimental Design and Method Selection:
The study compares conventional DGA methods based on gas concentrations with a proposed NEI-based approach. The NEI is calculated using hydrocarbon gas concentrations and their enthalpies of formation.
2：Sample Selection and Data Sources:
DGA databases from two large U.S. electric utilities were used, with incomplete samples and known after-failure samples removed.
3：List of Experimental Equipment and Materials:
Not explicitly mentioned in the abstract.
4：Experimental Procedures and Operational Workflow:
NEI was calculated for each sample record, and transformers were classified based on oxygen content. DGA limits were derived for hydrocarbon gas concentrations and NEI.
5：Data Analysis Methods:
Statistical analysis was conducted to estimate the relative uncertainty of NEI and TDCG. Sensitivity and rigidity of the HC gas and NEI scoring methods were compared.
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