NDLI: Impact of power system harmonics on insulation failure of distribution transformer and its remedial measures

Content Provider	IEEE Xplore Digital Library
Author	Deokar, S.A. Waghmare, L.M.
Copyright Year	2011
Description	Author affiliation: Instrumentation Engineering Department, SGGS, Institute of Engineering and Technology, Vishnupuri, Nanded-431606, India (Waghmare, L.M.) \|\| Electrical Engineering Department, Zeal Education, Society, Dnyanganga College of Engineering and Research, Pune-41, Maharashtra, India (Deokar, S.A.)
Abstract	The ageing of insulation denotes physical and chemical changes, which takes place as a result of electrical stresses in the power system network. In the modern days, a large use of nonlinear devices has resulted into increased distortion in load voltages. The current drawn by all such devices contains harmonics. The losses as well as insulation are more in the equipment at harmonic frequencies than the fundamental frequency. The thermal circuit capability at the fundamental frequency is inadequate to dissipate increased losses due to harmonic current. Hence excessive current drawn during steady state and dynamic power quality problems resulting into the higher temperature rise. The increased use of the non-linear devices in today's network is responsible for faster degradation of insulating material. The transformer transfers electrical energy from one point circuit to another. The additional heating experienced by a transformer depends on the harmonic content of the load current & the design principals of the transformer. In this paper, an attempt has been made to discuss the procedure for loss calculations and analysis of impact of the temperature rise on conventional oil immersed and derated transformer under the non-linear load conditions. Some remedial measures are also suggested to reduce the impact of harmonics on insulation failure.
Starting Page	136
Ending Page	140
File Size	294743
Page Count	5
File Format	PDF
ISBN	9781424486786
e-ISBN	9781424486793
DOI	10.1109/ICECTECH.2011.5941817
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-04-08
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Harmonics susceptibility Windings Oil insulation Power system harmonics Harmonic analysis transformer losse k-factor Circuit faults Power transformer insulation insulation
Content Type	Text
Resource Type	Article

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