NDLI: Modified transformer winding ladder network model to assess non-dominant frequencies

Content Provider	IET Digital Library
Author	Ahour, Jafar Nosratian Seyedtabaie, Saeed Gharehpetian, Gevork B.
Abstract	In this study, the challenging problem of computing the frequency-dependent lumped parameter ladder network model for transformer winding based on impedance frequency response is investigated. It is shown that the existing conventional model is not capable of simulating the non-dominant resonances; rather, this phenomenon can be adequately modelled using extra intersection capacitors. As usual, this large-scale non-linear optimisation problem is addressed using properly lined-up genetic algorithm. To accelerate the success of the estimation, the dimension of the problem and the search space is reduced by using logical and real constraints and equations derived from the transformer geometry and its electromagnetic specifications; if this is not done, the optimisation fails. The test results on a 20/0.4 kV, 1600 kVA transformer indicates that the computed model, which is improved and detailed, is superior to the conventional one in terms of simulating the non-dominant resonances of the transformer winding. Therefore, it is more reliable for the transformer transient behaviour analysis.
Starting Page	578
Ending Page	585
Page Count	8
ISSN	17518660
Volume Number	11
e-ISSN	17518679
Issue Number	Issue 4, Apr (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-epa/11/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-epa.2016.0635
Journal	IET Electric Power Applications
Publisher Date	2017-04-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Apparent Power 1600 KVA Combinatorial Mathematics Electromagnetic Specifications Frequency Response Frequency-dependent Lumped Parameter Ladder Network Genetic Algorithm Impedance Frequency Response Modified Transformer Winding Ladder Network Model Nondominant Frequency Nonlinear Optimisation Problem Nonlinear Programming Optimisation Technique Search Problem Transformer And Reactors Transformer Geometry Transformer Transient Behaviour Analysis Transformer Winding Transformer Windings Voltage 0.4 KV Voltage 20 KV
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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