By Gabe Paoletti, P.E.
Being involved in root-cause failure evaluations and harmonic studies provides a history of practical experience related to why harmonics destroy transformers. New Transformer Technology includes being aware of the new problems associated with new loads; and understanding how they can impact the life of a transformer.
Some examples of new loads, which are implemented for very good reasons are: adjustable speed drives and/or electronic ballasts both resulting in reduced electrical power demand and the associated cost savings; improving the capabilities by installing new data processing equipment in office buildings, industrial sites and institutions. When these new loads are being planned, it is imperative that harmonics be reviewed.
There has been substantial research and publications regarding the effects of harmonics on transformers. While harmonics can be linked to overloading neutral conductors and causing nuisance tripping of circuit breakers, we’re focusing on the impact of harmonics on transformers.
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