Frequency Characteristics of Transformer Windings

Frequency Characteristics of Transformer Windings

Charles Su (Charling Technology, Australia)
DOI: 10.4018/978-1-4666-1921-0.ch003
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Transformers are subjected to voltages and currents of various waveforms while in service or during insulation tests. They could be system voltages, ferroresonance, and harmonics at low frequencies, lightning or switching impulses at high frequencies, and corona/partial discharges at ultra-high frequencies (a brief explanation is given at the end of the chapter). It is of great importance to understand the frequency characteristics of transformer windings, so that technical problems such as impulse distribution, resonance, and partial discharge attenuation can be more readily solved. The frequency characteristics of a transformer winding depend on its layout, core structure, and insulation materials.
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Analysis Methods Of Winding Frequency Charateristics

The frequency characteristics of a transformer winding may be analysed from its terminal transfer function. Sinusoidal low voltages with different frequencies are applied at one end of the winding, and the response is measured at the other end. If the winding can be accessed at several points, the sinusoidal voltage distribution along the winding can also be analysed. Although the detailed equivalent circuit of a winding consists of distributed inductance, capacitance and resistance, within a certain frequency range it may perform approximately as a transmission line or a capacitive ladder network. These frequency ranges are important in impulse voltage distribution analysis and partial discharge location.

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Table of Contents
Gerard Ledwich
Charles Su
Charles Su
Chapter 1
Akihiro Ametani, Teruo Ohno
The chapter contains the basic theory of a distributed-parameter circuit for a single overhead conductor and for a multi-conductor system, which... Sample PDF
Transmission Line Theories for the Analysis of Electromagnetic Transients in Coil Windings
Chapter 2
Juan A. Martinez-Velasco
Power apparatus windings are subjected to voltage surges arising from transient events in power systems. High frequency surges that reach windings... Sample PDF
Basic Methods for Analysis of High Frequency Transients in Power Apparatus Windings
Chapter 3
Charles Su
Transformers are subjected to voltages and currents of various waveforms while in service or during insulation tests. They could be system voltages... Sample PDF
Frequency Characteristics of Transformer Windings
Chapter 4
Charles Su
A generator stator winding consists of a number of stator bars and overhang connections. Due to the complicated winding structure and the steel... Sample PDF
Frequency Characteristics of Generator Stator Windings
Chapter 5
Afshin Rezaei-Zare, Reza Iravani
This chapter describes the fundamental concepts of ferroresonance phenomenon and analyzes its symptoms and the consequences in transformers and... Sample PDF
Ferroresonance in Power and Instrument Transformers
Chapter 6
Marjan Popov, Bjørn Gustavsen, Juan A. Martinez-Velasco
Voltage surges arising from transient events, such as switching operations or lightning discharges, are one of the main causes of transformer... Sample PDF
Transformer Modelling for Impulse Voltage Distribution and Terminal Transient Analysis
Chapter 7
Masayuki Hikita, Hiroaki Toda, Myo Min Thein, Hisatoshi Ikeda, Eiichi Haginomori, Tadashi Koshiduka
This chapter deals with the transient recovery voltage (TRV) of the transformer limited fault (TLF) current interrupting condition using capacitor... Sample PDF
Transformer Model for TRV at Transformer Limited Fault Current Interruption
Chapter 8
Charles Su
High voltage power equipment with winding structures such as transformers, HV motors, and generators are important for the analysis of high... Sample PDF
Z-Transform Models for the Analysis of Electromagnetic Transients in Transformers and Rotating Machines Windings
Chapter 9
J.J. Dai
Modeling and simulating rotating machines in power systems under various disturbances are important not only because some disturbances can cause... Sample PDF
Computer Modeling of Rotating Machines
Chapter 10
Rafal Tarko, Wieslaw Nowak
The reliability of electrical power transmission and distribution depends upon the progress in the insulation coordination, which results both from... Sample PDF
Lightning Protection of Substations and the Effects of the Frequency-Dependent Surge Impedance of Transformers
Chapter 11
Jos A.M. Veens
In this chapter, the calculation of transient voltages over and between winding parts of a large power transformer, and the influence on the design... Sample PDF
Transformer Insulation Design Based on the Analysis of Impulse Voltage Distribution
Chapter 12
Nilanga Abeywickrama
Power transformers encounter mechanical deformations and displacements that can originate from mechanical forces generated by electrical... Sample PDF
Detection of Transformer Faults Using Frequency Response Analysis with Case Studies
Chapter 13
Martin D. Judd
Power transformers can exhibit partial discharge (PD) activity due to incipient weaknesses in the insulation system. A certain level of PD may be... Sample PDF
Partial Discharge Detection and Location in Transformers Using UHF Techniques
Chapter 14
B.T. Phung
Localized breakdowns in transformer windings insulation, known as partial discharges (PD), produce electrical transients which propagate through the... Sample PDF
Detection and Location of Partial Discharges in Transformers Based on High Frequency Winding Responses
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