bathtub curve, creeping discharge, EHV and UHV power transformer, failure, geomagnetic disturbances (GMD), geomagnetically induced current (GIC), GOST, harmonics, IEC, IEEE, internal insulation, safety margin, SDIPF reliability curve, ZTZ 1
Transformers Magazine Vol. 6, No. 5, 2019
Today the classical bathtub curve model is the main model for life expectancy calculation of all the electrical equipment and, especially, all kind of oil-filled transformers. Most of the stakeholders and maintenance engineers make their decisions on tests, treatments and most importantly, replacement, on the bathtub curve concept. The costs that are associated with the classical bathtub curve are substantial, mainly driven by the unnecessary treatment or unnecessary replacements.
Hrčak ID: 228367
Gurin, Vitaly; O'Hanlon, Terrence
Transformers Magazine Vol. 9, No. 4, 2022
The further development of UHV and EHV transmission lines and the aging of large power transformers (half of which are over 30 years old) will keep the developers of specifications of new transformers working for many years to come. To help them, a historical overview of the failures of EHV transformers in the 20th century was made in terms of modern Asset Lifecycle theory embedded in the SDIPF curve (Specify - Design – Installation - Potential failure – Failure), has been made. The main causes of accidents were shortcomings in Specify and Desi...
Hrčak ID: 285176