Transformer Risk Assessment and Mitigation Study

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Doble performed a study for AWEA members to collect and analyze dissolved gas-in-oil analysis (DGA) and other oil data, along with transformer failure information from AWEA members due to gassing issues with the turbine step-up transformers. The gassing behavior was analyzed for 90, 95 and 99% norms for this population. The gassing behavior of transformers that had failed or been removed from service or for repair was examined prior to the event and compared to norms. Interim guidelines for gassing of wind farm pad mount transformers have been provided. The guideline gassing levels are expected to decrease as transformers are improved for this application.


Paul Griffin, Vice President Global Professional Services, Doble Engineering Company

Harry Heulings, Senior Chemist, Doble Engineering Company

Chris Petrola, Manager, Electrical Engineering, Acciona Energy

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