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Dr Steve Mitchell

Conjoint Senior Lecturer

School of Elect Engineering and Computer Science (Electrical and Computer Engineering)

Career Summary

Biography

Steve Mitchell was born in Newcastle in 1969. In 1988 he began his Electrical Engineering degree in conjunction with a 7 year Industrial Traineeship. The Traineeship provided a broad range of electrical engineering experience including train/locomotive design and manufacture and heavy industry plant maintenance. Steve graduated with honours in 1995 and for the next five years he worked as a design engineer for an electronics company that manufactured equipment for mining and industrial applications. During this time his work primarily focussed on the design of control and protection relays which are now widely used in underground mining settings both in Australia and internationally. In 2000 Steve was appointed as a senior research assistant at the University of Newcastle. The research was based on the condition monitoring of high voltage bushings. From 2005 he was appointed as a professional officer at the university, providing electronic design and teaching support to the Electrical Engineering Department. In 2009 Steve was appointed as a Lecturer in Electrical Engineering at the University of Newcastle. Whilst employed by the University of Newcastle, Steve began a part time research higher degree. Steve's PhD was titled "Power Transformer Modelling to Support the Interpretation of Frequency Response Analysis" and was awarded in 2011. Following on from his roots in heavy industry, Steve's research interests continue to be primarily focussed on the design, condition monitoring and diagnostics of equipment found in the power, mining and heavy industry areas.

Research Expertise
Steve's research is in the area of condition monitoring, diagnostics and control of power and heavy industrial equipment. His particular area of focus is in power transformer diagnostics including Frequency Response Analysis and the localisation of partial discharge.

Teaching Expertise
Steve's teaching focus is in the area of analog and digital electronics, programmable logic design, embedded programming, and advanced computer systems.

Administrative Expertise
Administrative duty experience includes: - Program Convenor for Computer Engineering - Marketing leader for the Discipline of Electrical Engineering - Student Experience for the Discipline of Electrical Engineering - Industry Scholarships for Computer Engineering.

Qualifications

  • PhD, University of Newcastle
  • Bachelor of Engineering, University of Newcastle

Keywords

  • Computer Engineering
  • Condition Monitoring
  • Electrical Engineering
  • Frequency Response Analysis
  • High Voltage Equipment
  • Partial Discharge
  • Power Transformers

Languages

  • English (Fluent)

Fields of Research

Code Description Percentage
090607 Power and Energy Systems Engineering (excl. Renewable Power) 100

Professional Experience

Academic appointment

Dates Title Organisation / Department
1/07/2009 -  Lecturer University of Newcastle
School of Elect Engineering and Computer Science
Australia
1/01/2008 -  Membership - Institute of Electrical and Electronics Engineers (IEEE) Institute of Electrical & Electronic Engineers (IEEE)
Australia
1/03/2004 - 1/06/2009 Professional Officer University of Newcastle
School of Elect Engineering and Computer Science
Australia
1/10/2000 - 1/03/2004 Senior Research Assistant University of Newcastle
School of Elect Engineering and Computer Science
Australia

Professional appointment

Dates Title Organisation / Department
1/01/1996 - 1/11/2000 Design Engineer Bramco Electronics
Australia
1/01/1988 - 1/04/1995 Engineering Cadet A. Goninan & Co Pty Ltd
Australia

Awards

Recognition

Year Award
1995 Spruson & Ferguson Prize in Electrical / Computer Engineering
University of Newcastle

Research Award

Year Award
2007 Best Student Paper Award
Unknown
2006 Postgraduate Research Prize for Electrical, Computer and Communications Engineering
University of Newcastle
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Publications

For publications that are currently unpublished or in-press, details are shown in italics.


Journal article (7 outputs)

Year Citation Altmetrics Link
2015 Mitchell SD, Oliveira GHC, 'Analysing a power transformer's internal response to system transients using a hybrid modelling methodology', International Journal of Electrical Power and Energy Systems, 69 67-75 (2015)

This article presents a novel approach to analysing a power transformer's internal response to system transients. In this approach a hybrid modelling methodology is adopted which ... [more]

This article presents a novel approach to analysing a power transformer's internal response to system transients. In this approach a hybrid modelling methodology is adopted which leverages the distinct advantages offered by both Black and Grey Box modelling techniques. The Black Box model of the transformer is used within the EMTP system study environment in order to take advantage of its mathematical flexibility and modelling accuracy. Transients derived from network switching operations within the study can then be used for injection tests within the Grey Box modelling environment. The Grey Box model, which is based upon the physical structure of the transformer, will facilitate analysis of the transformer's internal voltage response to the external stimulus. A fundamental difference between the approach described in this paper and more traditional approaches is that it does not require prior knowledge of the internal geometry of the transformer. All of the modelling parameters are derived from external tests, nameplate details and an intrinsic understanding of common transformer design principles. This can be a distinct advantage since in most cases a transformer's design specifications are not readily available outside of the laboratory due to the manufacturer's intellectual property restrictions. A study of a gas insulated substation within a hydroelectric power plant in Brazil is used to demonstrate the proposed technique.

DOI 10.1016/j.ijepes.2014.12.064
2015 Schumacher R, Oliveira GHC, Mitchell SD, 'An Iterative Approach for Selecting Poles on Complex Frequency Localizing Basis Function-Based Models', Journal of Control, Automation and Electrical Systems, 26 380-389 (2015)

Modeling dynamic systems from frequency-domain data is a relevant issue for system analysis in many fields of engineering. Many techniques to approach such problems are based on m... [more]

Modeling dynamic systems from frequency-domain data is a relevant issue for system analysis in many fields of engineering. Many techniques to approach such problems are based on models built by using a series of rational functions with fixed structure. As far as rational basis function models are concerned, the problem of selecting the function¿s poles or dynamics is an issue and the Sanathanan¿Koerner (SK) iterations represent a successful approach that can be applied to solve it. Frequency localizing basis function (FLBF) models are a rational function which can be used in such a context. However FLBF, as originally proposed, are not suitable for application with SK-iterations because they have not been designed to incorporate complex poles. To overcome this issue and to make the application of SK-iterations possible, this paper proposes a new set of basis functions that are based on the FLBF. In this paper, they will be referred to as complex frequency localizing basis functions. This new set of basis functions preserves the FLBF behavior but real and complex poles can be incorporated in the model and so it allows the use of SK-iterations. The proposed model is validated through simulation.

DOI 10.1007/s40313-015-0183-5
2014 Mitchell SD, Rocha ADCO, Holdyk A, Gustavsen B, Jaarsveld BJ, Portillo A, et al., 'Electrical Transient Interaction between Transformers and the Power System', Electra (CIGRE), 97-103 (2014) [C2]
2013 Mitchell SD, Welsh JS, 'Initial parameter estimates and constraints to support gray box modeling of power transformers', IEEE Transactions on Power Delivery, 28 2411-2418 (2013) [C1]

An accurate transformer model is an important tool for use in the study of power transformers. However, a manufacturer's proprietary restrictions will generally make access to the... [more]

An accurate transformer model is an important tool for use in the study of power transformers. However, a manufacturer's proprietary restrictions will generally make access to the detailed design specifications of a transformer difficult. Therefore, in order to construct a physically representative transformer model, it is often necessary to estimate the model parameters. One approach is to fit the model to data obtained from tests, such as frequency-response analysis. However, during the process of fitting a model to a data set, it is critical that the estimated parameters appropriately represent the transformer under test. An estimator that is not constrained can converge on a parameter set which may satisfy the objective function but is not physically representative of the transformer. It is therefore important to constrain the model parameters. The aim of this paper is to formulate a methodology to obtain initial estimates and constraints for several fundamental transformer parameters. To demonstrate applicability, the initial parameter estimates and constraints are applied to a range of distribution transformers of varying age and manufacture, ranging in size from 200 kVA to 18 MVA. © 1986-2012 IEEE.

DOI 10.1109/TPWRD.2013.2259266
Citations Scopus - 3Web of Science - 3
Co-authors James Welsh
2011 Mitchell SD, Welsh JS, 'Modeling power transformers to support the interpretation of frequency-response analysis', IEEE Transactions on Power Delivery, 26 2705-2717 (2011) [C1]
DOI 10.1109/TPWRD.2011.2164424
Citations Scopus - 24Web of Science - 18
Co-authors James Welsh
2010 Mitchell SD, Welsh JS, 'The influence of complex permeability on the broadband frequency response of a power transformer', IEEE Transactions on Power Delivery, 25 803-813 (2010) [C1]
DOI 10.1109/TPWRD.2009.2036358
Citations Scopus - 3Web of Science - 2
Co-authors James Welsh
2007 Mitchell SD, Welsh JS, Middleton RH, Phung BT, 'Practical implementation of a narrowband high frequency distributed model for locating partial discharge in a power transformer', 2007 ELECTRICAL INSULATION CONFERENCE AND ELECTRICAL MANUFACTURING EXPO, 127-131 (2007)
DOI 10.1109/EEIC.2007.4562603
Citations Scopus - 1Web of Science - 1
Co-authors James Welsh, Richard Middleton
Show 4 more journal articles

Conference (14 outputs)

Year Citation Altmetrics Link
2014 Mirzaeva G, Ghaffarpour M, Mitchell SD, Gay D, 'DC power vs AC power for mobile mining equipment', Proceedings of 2014 IEEE Industry Applications Society Annual Meeting, Vancouver, BC, Canada (2014) [E1]
DOI 10.1109/IAS.2014.6978455
2013 Oliveira GHC, Mitchell SD, 'Comparison of Black-Box Modeling Approaches for Transient Analysis: A GIS case study', Proceedings of the 10th International Conference on Power Systems Transients, Vancouver, CA (2013) [E1]
2012 Mirzaeva G, Mitchell SD, 'Duty meter approach in condition monitoring of industrial electric motors', Proceedings of the 2012 Australian Mining Technology Conference, Perth, Western Australia (2012) [E1]
2012 Mitchell SD, Oliveira GHC, 'A hybrid modelling methodology for analysing the effect of system transients within power transformers', AUPEC 2012 22nd Australasian Universities Power Engineering Conference, Bali, Indonesia (2012) [E1]
2011 Mitchell SD, Welsh JS, 'Estimation of physical transformer parameters from frequency response analysis', IEEE PES Trondheim PowerTech 2011: The Power of Technology for a Sustainable Society, Trondheim, Norway (2011) [E1]
DOI 10.1109/PTC.2011.6019187
Co-authors James Welsh
2010 Mitchell SD, Welsh JS, Oliveira GHC, 'Physical modelling of power transformers utilising end to end frequency response analysis', CIGRE International Workshop on Power Transformers, VI Workspot, Parana, Brasil (2010) [E2]
Co-authors James Welsh
2010 Oliveira GHC, Schauenburg FF, Maestrelli R, Rocha ACO, Mitchell SD, Welsh JS, 'SimPowerSystems para Estudo de Transitorios no Sistema Irape - Aracuai Visando Uso de Modelos Caixa-Preta de Transformadores', CIGRE International Workshop on Power Transformers, VI Workspot, Parana, Brasil (2010) [E3]
Co-authors James Welsh
2010 Oliveira GHC, Mitchell SD, Welsh JS, 'Modeling approaches based on FRA tests for simulating and analyzing a power transformer's dynamic behavior: A comparison', ARWtr 2010 Proceedings, Santiago de Compostela, Spain (2010) [E1]
Co-authors James Welsh
2009 Mitchell SD, Welsh JS, 'Permeability and its influence on the broadband frequency response of a power transformer', 2009 Asia-Pacific Power and Energy Engineering Conference, Wuhan, China (2009) [E1]
DOI 10.1109/appeec.2009.4918596
Co-authors James Welsh
2008 Mitchell SD, Welsh JS, Phung BT, 'Relating a distribution transformer's connection topology and the influence of inductive disparity to the observed frequency response', AUPEC '08 Australasian Universities Power Engineering Conference 2008, Sydney, NSW (2008) [E1]
Co-authors James Welsh
2007 Mitchell SD, Welsh JS, Middleton RH, Phung BT, 'Practical implementation of a narrowband high frequency distributed model for locating partial discharge in a power transformer', 2007 EIC/EM EXPO. Electrical Insulation Conference and Electrical Manufacturing Expo. Proceedings, Nashville, TN (2007) [E2]
DOI 10.1109/EEIC.2007.4562603
Co-authors Richard Middleton, James Welsh
2007 Welsh JS, Rojas CR, Mitchell SD, 'Wideband parametric identification of a power transformer', Conference Proceedings of the 2007 Australasian Universities Power Engineering Conference. AUPEC'07, Perth, WA (2007) [E1]
Citations Scopus - 1
Co-authors James Welsh
2007 Mitchell SD, Welsh JS, Middleton RH, Phung BT, 'A narrow band high frequency distributed power transformer model for partial discharge location', Conference Proceedings of the 2007 Australasian Universities Power Engineering Conference. AUPEC'07, Perth, WA (2007) [E1]
Co-authors Richard Middleton, James Welsh
2003 Xu S, Mitchell SD, Middleton RH, 'Partial Discharge Localization for a Transformer Based on Frequency Spectrum Analysis', Proceeding for AUPEC 2003, Christchurch, NZ (2003) [E1]
Co-authors Richard Middleton
Show 11 more conferences

Report (2 outputs)

Year Citation Altmetrics Link
2014 Mitchell SD, Rocha ADCO, Holdyk A, Gustavsen B, Jaarsveld BJ, Portillo A, et al., 'Electrical Transient Interaction Between Transformers and the Power System Part 1 - Expertise', CIGRE, 175 (2014) [R1]
2014 Mitchell SD, Rocha ADCO, Holdyk A, Gustavsen B, Jaarsveld BJ, Portillo A, et al., 'Electrical Transient Interaction Between Transformers and the Power System Part 2 - Case Studies', CIGRE, 123 (2014) [R1]
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Grants and Funding

Summary

Number of grants 8
Total funding $216,833

Click on a grant title below to expand the full details for that specific grant.


20141 grants / $1,500

2014 IEEE PES General Meeting, Washington DC USA, 27-31 July 2014$1,500

Funding body: University of Newcastle - Faculty of Engineering & Built Environment

Funding body University of Newcastle - Faculty of Engineering & Built Environment
Project Team Doctor Steve Mitchell
Scheme Travel Grant
Role Lead
Funding Start 2014
Funding Finish 2014
GNo G1400778
Type Of Funding Internal
Category INTE
UON Y

20131 grants / $177,333

DC Motor Duty Meter Prototype - Stage 3$177,333

Funding body: Australian Coal Research Limited

Funding body Australian Coal Research Limited
Project Team Doctor Galina Mirzaeva, Doctor Steve Mitchell, Professor Robert Betz, Doctor Terrence Summers
Scheme Australian Coal Association Research Program (ACARP)
Role Investigator
Funding Start 2013
Funding Finish 2013
GNo G1200841
Type Of Funding CRC - Cooperative Research Centre
Category 4CRC
UON Y

20121 grants / $1,500

Australasian University's Power Engineering Conference 2012, Hotel Ramada, Kuta, bali, Indonesia, 26 - 29 September 2012$1,500

Funding body: University of Newcastle - Faculty of Engineering & Built Environment

Funding body University of Newcastle - Faculty of Engineering & Built Environment
Project Team Doctor Steve Mitchell
Scheme Travel Grant
Role Lead
Funding Start 2012
Funding Finish 2012
GNo G1200944
Type Of Funding Internal
Category INTE
UON Y

20113 grants / $11,500

Winding Deformation Detection in Power Transformers$5,710

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Steve Mitchell
Scheme Early Career Researcher Grant
Role Lead
Funding Start 2011
Funding Finish 2011
GNo G1100274
Type Of Funding Internal
Category INTE
UON Y

Winding Deformation Detection in Power Transformers$4,290

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Steve Mitchell
Scheme Early Career Researcher (Equipment) Grant
Role Lead
Funding Start 2011
Funding Finish 2011
GNo G1101005
Type Of Funding Internal
Category INTE
UON Y

IEEE PES Trondheim PowerTech 2011, Norwegian University of Science and Technology, 19 - 23 June 2011$1,500

Funding body: University of Newcastle - Faculty of Engineering & Built Environment

Funding body University of Newcastle - Faculty of Engineering & Built Environment
Project Team Doctor Steve Mitchell
Scheme Travel Grant
Role Lead
Funding Start 2011
Funding Finish 2011
GNo G1100770
Type Of Funding Internal
Category INTE
UON Y

20101 grants / $5,000

New Staff Grant 2010$5,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Steve Mitchell
Scheme New Staff Grant
Role Lead
Funding Start 2010
Funding Finish 2010
GNo G1000062
Type Of Funding Internal
Category INTE
UON Y

20091 grants / $20,000

Fault Detection in Electricity Networks$20,000

Funding body: Ausgrid

Funding body Ausgrid
Project Team Doctor Steve Mitchell, Doctor James Welsh, Associate Professor Jose De Dona
Scheme Sponsorship Agreement
Role Lead
Funding Start 2009
Funding Finish 2009
GNo G0900082
Type Of Funding Other Public Sector - State
Category 2OPS
UON Y
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Research Supervision

Number of supervisions

Completed0
Current6

Total current UON EFTSL

Masters0.8
PhD0.8

Current Supervision

Commenced Level of Study Research Title / Program / Supervisor Type
2015 Masters The Impact of Oil Filled Power Transformer Life Cycle Management Decisions on Retirement Causes
Electrical Engineering, Faculty of Engineering and Built Environment, The University of Newcastle
Co-Supervisor
2014 PhD Control of Grid Connected Power Electronic Devices
Electrical Engineering, Faculty of Engineering and Built Environment, The University of Newcastle
Co-Supervisor
2013 Masters Condition Monitoring of Power Transformers
Electrical Engineering, Faculty of Engineering and Built Environment, The University of Newcastle
Principal Supervisor
2013 Masters Power Transformers Condition Assessment
Electrical Engineering, Faculty of Engineering and Built Environment, The University of Newcastle
Principal Supervisor
2013 PhD DC Microgrid for Mobile Mining Equipment
Electrical Engineering, Faculty of Engineering and Built Environment, The University of Newcastle
Co-Supervisor
2011 Masters Condition Monitoring of Power Transformers
Electrical Engineering, Faculty of Engineering and Built Environment, The University of Newcastle
Principal Supervisor
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Dr Steve Mitchell

Position

Conjoint Senior Lecturer
School of Elect Engineering and Computer Science
Faculty of Engineering and Built Environment

Focus area

Electrical and Computer Engineering

Contact Details

Email steve.mitchell@newcastle.edu.au
Phone (02) 4921 6147
Fax (02) 4921 6993

Office

Room EAG32
Building Building EA
Location Callaghan
University Drive
Callaghan, NSW 2308
Australia
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