[Sreelatha Gajjala]

Can any body tell me what is the permissible value of tangent delta of windings for commissioning of Transformers?
Can any body tell me what is the permissible value of tangent delta of windings for commissioning of Transformers?

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[Hamid]

Power-factor or dissipation factor ( tangent of the loss angle) testing of insulating oil shall performe in accordance with American Society for Testing and Materials (ASTM) D 924, Standard Test Method for Dissipation Factor (or Power Factor) and Relative Permittivity (Dielectric Constant) of Electrical Insulating Liquids as below: The overall PF test results of oil-filled power and distribution transformers indicate the insulation condition of the solid windings, oil, barriers, bushings, etc. The overall PF value for individual windings-to-ground and inter windings insulation of modern oil-filled transformers should be 0.5% or less, corrected to 20

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