Analysis of the Voltage Stresses on Transformer Windings under Different Type of Surges
نویسندگان
چکیده
Standard high voltage lightning and switching impulse tests are performed on Extra High Voltage (EHV) transformers during manufacture to ascertain the breakdown strength of insulation used. But during their service, transformers encounter numerous voltage transients of complex and varying wave shapes which do not necessarily resemble these standard surge type voltages. This paper reports the results of investigation on the internal response of transformer windings under standard lightning impulse voltage and system originated oscillatory transient over-voltages and the results were compared. The present study should promote understanding and assessment of voltage stresses in transformer windings under various probable terminal disturbances and this knowledge may be useful in incorporating necessary changes in transformer dielectric test standards.
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