Transcription of Power Factor Testing Nov2005 - Doble Engineering
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Power Factor Testing Nov2005 - Doble Engineering
THE VALUE OF Power Factor TESTINGNov 1, 2005 12:00 PMby John Bleyer and Phillip Prout, National GridNATIONAL GRID DISCOVERED A HIGH Power Factor DURING ACCEPTANCETESTING of a new 40-MVA transformer in 2004. The unit was then returned to the factory for repairs,burdening both the utility and manufacturer with additional costs and delays. This article reviews theinformation gathered and lessons learned from this event, including Testing and root-cause determinationresults from the teardown/repair Grid's electricity delivery companies in the United States serve million electricity customers inNew England and upstate New York through more than 1200 substations. As part of a substation expansionproject, a 24/32/40-MVA, 115- transformer was purchased and installed at a National Gridsubstation in New transformer was delivered to the substation. The radiators and bushings were installed. The unit wasvacuum processed, filled under vacuum and tested by the transformer manufacturer's personnel.
POWER FACTOR TESTING Insulation power factor tests are used to measure dielectric losses, which relate the wetness, dryness or deterioration of transformer insulation. Both factory and field testing are performed to verify the insulation integrity of substation transformers. Power factor testing a two-winding transformer is conducted by
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