NDLI: Thermal analysis and derating of a power transformer with harmonic loads

Content Provider	IET Digital Library
Author	Beyranvand, Morteza Mikhak Faiz, Jawad Rezaeealam, Behrooz
Abstract	Thermal conditions of power transformers in abnormal operating conditions such as harmonic loads can be considered as a critical case. In this study, thermal analysis of transformer and additional imposed heat on it, caused by non-linear loads, are addressed. For this purpose, an appropriate thermal equivalent circuit is used in which temperature of different parts of oil-immersed power transformers are obtained for harmonic loads. The losses of various components of transformer as heat-generating sources are estimated. At this end, an appropriate three-dimensional finite element method is applied to estimate the losses of different parts of transformer. To keep the transformer temperature rise around the permissible value, the transformer is derated. Transformer derating based on the IEEE Std C57.110–2008 recommendation considerably reduces the transformer loading capability. Therefore, this study introduces a new technique for derating of transformer for harmonic loads. This enhances the transformer thermal limits and transformer loading capacity.
Starting Page	1233
Ending Page	1241
Page Count	9
ISSN	17518687
Volume Number	14
e-ISSN	17518695
Issue Number	Issue 7, Apr (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/14/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2019.0703
Journal	IET Generation, Transmission & Distribution
Publisher Date	2019-11-13
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Abnormal Operating Condition Additional Imposed Heat Appropriate Thermal Equivalent Circuit Derating Finite Element Analysis Harmonic Load IEEE Standards Nonlinear Load Oil-immersed Power Transformer Organic Insulation Power Transformer Power Transformer Insulation Power Transformer Testing Temperature Measurement Thermal Analysis Thermal Condition Thermal Variables Measurement Transformer And Reactors Transformer Loading Capability Transformer Loading Capacity Transformer Oil Transformer Temperature Rise Transformer Thermal Limits Transformer Windings
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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