Interpreting Key Gas Data

September 17, 2024 11:00AM – 12:00PM CDT

As maintenance practices for utilities are quickly shifting from cyclic to a more condition-based approach, it has become a customary practice to install online monitoring for most high-value assets. Much of this monitoring has focused on dissolved gas analysis for power transformers. The formation of hydrogen and hot metal gases is typically the leading indicator of excessive thermal conditions developing within the transformer. This can result in solid insulation degradation, causing the unit’s premature failure. While there are several approaches to applying this type of monitoring, ranging from complex multi-gas systems to key gas monitoring, there must be a good understanding of the data being collected and how that data can be used to best determine the overall health of a particular transformer. When key gas monitoring is considered, it requires a good understanding of several factors to establish a successful monitoring program. This would include the types of conditions associated with various levels of hydrogen generation, where alarm points need to be set to best detect these conditions, and how to utilize offline tests in conjunction with key gas monitoring to provide the best assessment of transformer health.

Presented by Chris Rutledge

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