Insulation temperature increase in power transformers due to stationary disturbances: Comparison of methods

Author

Duran, I.C. ; Duarte, O.G. ; Pavas, Andres

Author_Institution

Electr. Eng., Univ. Nac. de Colombia, Bogota, Colombia

fYear

2013

fDate

6-7 July 2013

Firstpage

1

Lastpage

6

Abstract

This paper presents the comparison of two methods to estimate the insulation temperature increase and lifetime reduction in power transformers due to the presence of stationary power quality disturbances. The internal insulation can suffer an accelerated aging by temporary increases of rms values of currents caused by waveform distortion (harmonic current). The recurrent presence of increase in rms values during long time periods will produce a cumulative effect that degrade the dielectric material. Models for insulation aging are employed. A discussion about the effects on insulation lifetime is presented.

Keywords

dielectric materials; harmonic analysis; power supply quality; power transformer insulation; cumulative effect; dielectric material; harmonic current; insulation aging; insulation temperature; power transformer; rms value; stationary power quality disturbance; waveform distortion; Aging; Equations; Harmonic analysis; Mathematical model; Power transformers; Resistance; Temperature; Accelerated Aging Factor; Arrhenius equation; Eddy-current losses; Harmonics; Power quality; Stray losses; insulation lifetime;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics and Power Quality Applications (PEPQA), 2013 Workshop on

Conference_Location

Bogota

Type

conf

DOI

10.1109/PEPQA.2013.6614960

Filename

6614960