For these reasons, transformer condition assessment and failure analysis is a high priority. In addition, the transformer fleets in several parts of the world are operating beyond their design lives, with higher-than-average loads. Reliable energy flow is essential for all major electric utility companies, making power transformers one of their most important assets and largest investments. We will fully describe each of the available interpretation techniques as well as provide a comparison of the accuracy and reliability of each diagnostic method based on one independent case study. Therefore, it is the intent of this paper to provide common knowledge and understanding of all the tools, methods, and techniques available for non-chemical engineers within typical utility companies. DGA techniques have become so sensitive and accurate at measuring these gases that the entire scheme has become standard practice as part of the normal maintenance for many electric power utility companies.ĭespite how effective DGA techniques have become, the proper use and interpretation of gas level results (i.e., ppm levels) is still not fully understood by many utility people. It has been proven that the generation of certain gases within a transformer is an excellent indicator that a failure is pending. The use of Dissolved Gas Analysis (DGA) as a method for determining the types of pending or occurring faults within power transformers has been in practice for many years.
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