Al Ain Distribution Company (AADC)

2015 ARS, Europe: Amsterdam, The NetherlandsRed Room, Session 2

Maintenance Strategy Optimization by Implementing Reliability Analysis for

Power Distribution Transformer at Al AinDistribution Company

Eng. Abdulla Y. Alseiari

Begins at 10:30 AM, Tuesday, April 21st

PRESENTATION SLIDESThe following presentation was delivered at the:

International Applied Reliability Symposium, EuropeApril 21 - 23, 2015: Amsterdam, Netherlands

http://www.ARSymposium.org/europe/2015/

The International Applied Reliability Symposium (ARS) is intended to be a forum for reliability and maintainability practitioners within industry and government to discuss their success stories and lessons learned regarding

the application of reliability techniques to meet real world challenges. Each year, the ARS issues an open"Call for Presentations" at http://www.ARSymposium.org/europe/presenters/index.htm and the presentations

delivered at the Symposium are selected on the basis of the presentation proposals received.

Although the ARS may edit the presentation materials as needed to make them ready to print, the content of the presentation is solely the responsibility of the author. Publication of these presentation materials in the

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The publication of these materials in the ARS presentation format is Copyright © 2015 by the ARS, All Rights Reserved.

Abdulla Y. Alseiari, Al Ain Distribution Company (AADC) Slide Number: 2Session 2Red Room App

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Main Topics Overview of Abu Dhabi Water & Electricity Authority (ADWEA)

& Al Ain Distribution Company (AADC) Company Profile.

Background of Power Systems

Research Aims and Objectives.

Research Methodology.

Results and Discussion.

Conclusion, Lessons learned and Future Work.


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15Overview of ADWEA and AADC Company Profile

ADWEA:

AADC: AADC was introduced in 1999.

It is the only distributor of water and electricity in Al Ain.

The power distribution network has modern electrical substations.

It makes use of the latest technologies in their power networks, including such instruments as

SCADA system, Maximo Program and GIS System.

AADC’s leadership in implementation of condition monitoring techniques (off-line) since 2006.


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Challenges of Maintenance

1) Need to build strong and comprehensive failure code for power assets as per the RCM information worksheet.

2) Maintenance costs optimization.


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Background of Power Systems Main Elements of Power Systems:

1) Generation System.2) Transmission System.3) Distribution System.

Power Transformer is a critical asset in power systems.

Why it is critical?


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Main Parts of Power TransformerPower Transformer consists from:


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Research Aims

Develop the current maintenance policy for power networks at

AADC.

Improve the reliability of AADC power networks.

Optimize Maintenance costs.

Research Question:

How can improve and develop the reliability and maintainability of 33kV power

assets (Power Transformer) at AADC by implementing reliability, RCM and

degradation analysis?


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Research Objectives

Objective 1: Assess reliability data of AADC.

Objective 2: Determine the critical failures on power transformer.

Objective 3: Implement RCM on power transformer.

Objective 4: Use FMEA techniques on power transformer.

Objective 5: Optimize maintenance costs of power transformer.

Objective 6: Apply NDT and condition monitoring techniques on

power transformer.

Objective 7: Apply prognostic techniques in order to predict the

remaining useful life of power transformer.


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Research Analysis Tools


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Results and Discussion1-Defective Components of Power Transformer at AADC (2005-2013)


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Results and Discussion2-Reliability Analysis for Failure Data of Power Assets 33kV (P.T)


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The Bathtub Curve


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Results and Discussion3-RCM Information Worksheet


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Results and Discussion4-RCM Decision Worksheet


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Results and Discussion5-FMEA (RPN Analysis)


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Results and Discussion6-FMEA (FTA Analysis)


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Results and Discussion7-RCM Failure Costs Analysis


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Results and Discussion8-PM Optimization for On Load Tap Changer (OLTC)


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The P-F Curve


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Results and Discussion9-Predict P-F Interval Based on Paper Degradation Analysis of (P.T)

Month


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15Results of Potential Failure Prediction Time of Paper Insulation (ReliaSoft's Weibull++ 9 Simulation)


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Conclusion

Failure rate of both downtime and MTBF increases.

MTBF follows renewal process (RP).

RCM information and decision worksheets of (P.T) are established.

FTA defines the associated causes with oil leakage.

RPN indicated the most critical subsystems of the transformer.

The AWB software recommends optimum PM interval at 5,688

operating hours for OLTC related failures.

ReliaSoft's Weibull++ 9 software recommended maintenance strategy

of the transformer at 47.93 Month based on (P-F interval concept).


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Future Work

Connect an effective condition monitoring techniques like (DGA,

thermography infrared camera, vibration analysis, and ultrasonic

test) to power transformers through existing SCADA System.

Create RCM system.


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References Baird, P. J., Herman, H., Stevens, G. C. & Jarman, P. N., 2006. Non-destructive Measurement of the Degradation of Transformer Insulating Paper.

Dielectrics and Electrical Insulation, IEEE Transactions on, 13(2), pp. 309-318. Bayliss, C. & Hardy, B., 2007. Transmission and Distribution Electrical Engineering. Oxford: Elsevier. Birolini, A., 2010. Reliability Engineering: Theory and Practice. Verlag Berlin Heidelberg: Springer. Blischke, W. R. & Murthy, D. P., 2003. Case Studies in Reliability and Maintenance. Hoboken: John Wiley & Sons. Bloom, N., 2006. Reliability Centered Maintenance (RCM): Implementation Made Simple. New York: McGraw-Hill. Cadick, J., 1999. CONDITION BASED MAINTENANCE. [Online] Available at: http://www.cadickcorp.com/download/cbm-howtogetstarted.pdf

[Accessed 01 05 2014]. Chowdhury, A. & Koval, D., 2009. Power Distribution System Reliability: Practical Methods and Applications. Hoboken: John Wiley & Sons. Crespo Márquez, A., Moreu, d., J.F, G. F. & López Campos , M., 2009. The Maintenance Management Framework. Journal of Quality in

Maintenance Engineering, 15(2), pp. 167-178. Electrical Science, 2014. Transformer Tap Changer. [Online] Available at: http://electrical-science.blogspot.co.uk/2010/04/transformer-tap-

changer.html [Accessed 05 05 2014]. Elsayed, E. A., 1996. Reliability Engineering. Reading: Wesley Longman. Engineering Statistics HandBook, 2014. Bathtub Curve. [Online] Available at: http://www.itl.nist.gov/div898/handbook/apr/section1/apr124.htm

[Accessed 28 04 2014]. Gorjian, N. et al., 2009. A review on degradation models in reliability analysis. Athens. Heathcote, M. J. & Franklin, D. P., 2007. The J & P transformer book: a practical technology of the power transformer. Burlington: Newnes. Institution of Electrical Engineers, 2006. Electrical Maintenance. Stevenage: IEE. International Atomic Energy, 2005. Non-Destructive Testing for Plant Life Assessment. [Online] Available at: http://www-

pub.iaea.org/mtcd/publications/pdf/tcs-26_web.pdf [Accessed 12 05 2014]. Lelekakis, N. et al., 2012. A field study of aging in paper-oil insulation systems. Electrical Insulation Magazine, IEEE, 28(1), pp. 12-19. Moubray, J., 1997. Reliability-centred maintenance. Oxford: Butterworth-Heinemann. O'Conner, P. & Kleyner, A., 2012. Practical Reliability Engineering. Wiley. Reliability Hot-Wire, 2007. On-Condition Maintenance Using P-F Interval or Failure Detection Threshold (FDT). [Online] Available at:

http://www.weibull.com/hotwire/issue76/hottopics76.htm [Accessed 30 05 2014].


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Author Information Name: Abdulla Y. Alseiari Position: Operation Planning Engineer Abu Dhabi Water & Electricity Authority (ADWEA) / Al Ain Distribution Company (AADC)

Address: Al Ain Distribution Company P.O. Box 1065 Al Ain United Arab Emirates Phone: +971502188779

Fax: +97137629949 E-mail: Work: [email protected]

Personal: [email protected]

Company Web Site URL: ADWEA: www.adwea.com AADC: www.aadc.ae Abdulla Alseiari is an operation planning engineer at Al Ain Distribution Company. He has 8 years experience inoperation and maintenance for power distribution networks. His responsibilities included develop and improve themaintenance policy for power distribution assets as well as optimize the maintenance strategy for critical powerassets such as power transformers through implementing advance reliability techniques in order to achieve highreliability for power assets and hence reach the company’s vision and mission. Mr. Alseiari has published hisacademic research in maintenance management and the research title was ‘The Development of Maintenance Policyfor Power Distribution Network at AADC’. He holds a B.S. in Electrical Engineering (Networks andCommunications Engineering) from Al Ain University of Science and Technology at United Arab Emirates and heholds MSc in Maintenance Management from Glasgow Caledonian University at Scotland in the UK.


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Questions

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Al Ain Distribution Company (AADC)