Dr Chandima Ekanayake
Senior Lecturer
School of Electrical Engineering and Computer Science
+61 7 336 53762
Researcher biography
Chandima Ekanayake received his B.Sc.Eng (Hons) in 1999 from the University of Peradeniya, Sri Lanka. He obtained his Tech. Lic. and PhD from Chalmers University of Technology, Sweden, in 2003 and 2006 respectively. From 2006 to June 2008 he was attached to the Department of Electrical and Electronic Engineering, University of Peradeniya, Sri Lanka as a Senior lecturer. In 2008 he joined School of ITEE, The University of Queensland as a Post-Doctoral Research Fellow and in 2011 became a lecturer attached to the same school. From 2015-2018 he served as a lecturer in School of Engineering, Griffith University. In 2018 he re-joined school of ITEE, UQ where he is currently a senior lecturer.
His research focuses on instrumentation for condition monitoring & protection of power system assets and developing ageing models based on laboratory and field measurements to quantify the ageing of assets due to multi-factor ageing mechanisms. This work targets to increase the reliability and efficiency of electricity supply. Chandima's current research areas are as follows:
- Developing lifetime prediction models - Many power system assets are currently operating beyond their designed life. It is not economical to replace these expensive assets based on the age. As operating conditions of the modern electrical grid is significantly different from the traditional system the operating stresses imposed on the assets are complex and therefore traditional failure prediction models are not capable to count these effects on the ageing of power system assets. Our research is focused on identifying the failure mechanisms under modern operating conditions of the grid through laboratory and field investigations to develop new life time prediction models for power system assets including transformer, cables , bushings, circuit breakers and tap changers.
- Smart Monitoring - Developing reliable monitoring techniques and applying artificial intelligence for condition assessment of power system assets are essential requirements for advanced asset monitoring systems. Our research is focused on developing smart monitoring systems using start-of-the-art facilities available at UQ. This includes instrumentation, signal processing, data analytics and application of artificial intelligence.
- Insulating materials and emerging tests - Introducing sustainable materials for high voltage insulation systems is a timely requirement. In addition reliable tests to determine the condition of new and existing materials used for electrotechnology is essential. UQ has state-of-the-art lab facilities for electrical insulation ageing studies and developing diagnostic tools and associated knowledge. Our current research is focused on application of bio-degradable oil, developing thermal models for new insulating materials, analysis on corrosive sulphur in transformers, oil paper ageing, XLPE ageing and evaluating moisture in high voltage insulation systems.
- Power quality - Detection and classification of power quality can improve the grid reliability. Our research is focused on developing suitable techniques to identify the system status and asset conditions through power quality measurements.
Chandima is senior member of IEEE. He is an active IEEE volunteer and held many volunteer positions including the Chair of IEEE PES/DEIS Queensland and Chair of IEEE Sri Lanka section. Currently he is serving as the Deputy Director of Australasian Transformer Innovation Centre. Chandima is a member of CIGRE Australian Panel B1 and closely working with CIGRE Australian A2 and D1. His research work is closely associated with the Australian electricity supply industry.
Journal Articles
Dixit, Anupam, Ma, Hui, Ekanayake, Chandima, Daghrah, Muhammad and Saha, Tapan Kumar (2024). Investigation of cellulose insulation ageing in transformers retrofilled with ester fluids at different service years. IEEE Transactions on Dielectrics and Electrical Insulation, 31 (4), 2151-2160. doi: 10.1109/tdei.2024.3373557
Xu, Shijie, Zhang, Ruiyuan, Ma, Hui, Ekanayake, Chandima and Cui, Yi (2024). On vision transformer for ultra-short-term forecasting of photovoltaic generation using sky images. Solar Energy, 267 112203, 1-12. doi: 10.1016/j.solener.2023.112203
Arachchige, Thanuja Gawasingha, Zhong, Xin, Ekanayake, Chandima, Ma, Hui and Saha, Tapan (2023). Characterization of electrical tree initiation and growth in XLPE under harmonic waveforms. IEEE Transactions on Dielectrics and Electrical Insulation, 30 (5), 1974-1982. doi: 10.1109/tdei.2023.3297556
Le, Vinh Hao, Ma, Hui, Ekanayake, Chandima and Saha, Tapan (2022). On recognition of multiple power quality disturbance events in electricity networks. IET Generation, Transmission and Distribution, 16 (9), 1697-1713. doi: 10.1049/gtd2.12378
Pallot, Jakob, Ekanayake, Chandima, Ma, Hui and Naranpanawe, Lakshitha (2022). Application of operational modal analysis to investigate transformer vibration patterns . IET Generation, Transmission and Distribution, 16 (10), 1964-1973. doi: 10.1049/gtd2.12406
Dixit, Anupam, Ekanayake, Chandima, Ma, Hui, Saha, Tapan K. and Ansari, Muhammad Hafeez (2022). Thermal analysis of natural cooling type distribution transformer retrofilled with natural ester oil. IEEE Transactions on Dielectrics and Electrical Insulation, 29 (1), 1-1. doi: 10.1109/tdei.2022.3148447
Zhong, Xin, Gawasingha Arachchige, Thanuja , Ma, Hui, Ekanayake, Chandima and Saha, Tapan Kumar (2022). Experimental study on partial discharge inception voltage of pressboard-enclosed void at different frequencies from the perspective of the first partial discharge time lag. IEEE Transactions on Dielectrics and Electrical Insulation, 29 (4), 1-1. doi: 10.1109/tdei.2022.3183674
Arachchige, Thanuja Gawasingha, Zhong, Xin, Ekanayake, Chandima, Ma, Hui and Saha, Tapan (2021). Electrical tree driven breakdown of XLPE under step stress breakdown test at multiple frequencies. IEEE Transactions on Dielectrics and Electrical Insulation, 28 (6), 2065-2073. doi: 10.1109/tdei.2021.009903
Kumara, S., Matharage, S., Bandara, K., Wickramasuriya, P., Yousuf, F., Ekanayake, C., Fernando, M., Wang, Z. and Gubanski, S. M. (2021). Frequency Domain Measurements for Diagnosis of Power Transformers: Experiences from Australia, Malaysia, Sri Lanka and UK. CIGRE Science and Engineering, 2021 (22).
Zhong, Xin, Ekanayake, Chandima, Ma, Hui and Saha, Tapan K. (2021). Ageing analysis of solar farm inverter transformers. IEEE Transactions on Power Delivery, 36 (6), 1-10. doi: 10.1109/tpwrd.2021.3049505
Samarasinghe, Sameera, Ekanayake, Chandima, Ma, Hui, Saha, Tapan K., Baniya, Jayaram, Allan, David and Russel, Gary (2021). A risk assessment for utilities to prevent transformer OLTC failures caused by silver sulphide corrosion. IEEE Transactions on Power Delivery, 37 (3), 1-1. doi: 10.1109/tpwrd.2021.3128623
Samarasinghe, Sameera, Ma, Hui, Ekanayake, Chandima, Martin, Daniel and Saha, Tapan (2020). Investigating passivator effectiveness for preventing silver sulfide corrosion in power transformer on-load tap changers. IEEE Transactions on Dielectrics and Electrical Insulation, 27 (5) 9215132, 1761-1768. doi: 10.1109/tdei.2020.008996
Zhu, Lingyu, Zhang, Fan, Ji, Shengchang, Naranpanawe, Lakshitha, Ma, Hui, Ekanayake, Chandima and Saha, Tapan (2020). Investigation of overall and local vibration characteristics of disk-type windings. IET Generation, Transmission and Distribution, 14 (18), 3685-3691. doi: 10.1049/iet-gtd.2019.0756
Naranpanawe, Lakshitha, Ekanayake, Chandima and Saha, Tapan K. (2019). Measurements on pressboard to understand the effect of solid insulation condition on monitoring of power transformer winding clamping pressure. IET Science, Measurement and Technology, 13 (2), 186-192. doi: 10.1049/iet-smt.2018.5096
Islam, Mojaharul, Yang, Fuwen, Ekanayek, Chandima and Amin, Mohammad (2018). Grid power fluctuation reduction by fuzzy control based energy management system in residential microgrids. International Transactions on Electrical Energy Systems, 29 (3) e2758, e2758. doi: 10.1002/etep.2758
Naranpanawe, Lakshitha, Ekanayake, Chandima, Annamalai, Pratheep K. and Saha, Tapan Kumar (2017). Influence of moisture dependency of pressboard on transformer winding clamping pressure. IEEE Transactions on Dielectrics and Electrical Insulation, 24 (5) 8120379, 3191-3200. doi: 10.1109/TDEI.2017.006206
Raza, Muhammad Qamar , Nadarajah, Mithulananthan and Ekanayake, Chandima (2017). Demand forecast of PV integrated bioclimatic buildings using ensemble framework. Applied Energy, 208, 1626-1638. doi: 10.1016/j.apenergy.2017.08.192
Jalil, Jubayer, Zhu, Yong, Ekanayake, Chandima and Ruan, Yong (2017). Sensing of single electrons using micro and nano technologies: A review. Nanotechnology, 28 (14) 142002, 142002. doi: 10.1088/1361-6528/aa57aa
Raza, Muhammad Qamar, Nadarajah, Mithulananthan and Ekanayake, Chandima (2016). On recent advances in PV output power forecast. Solar Energy, 136, 125-144. doi: 10.1016/j.solener.2016.06.073
Bandara, Kapila, Ekanayake, Chandima and Saha, Tapan Kumar (2016). Analysis of frequency domain dielectric response of pressboard insulation impregnated with different insulating liquids. IEEE Transactions on Dielectrics and Electrical Insulation, 23 (4) 7556477, 2042-2050. doi: 10.1109/TDEI.2016.7556477
Cui, Yi, Ma, Hui, Saha, Tapan, Ekanayake, Chandima and Martin, Daniel (2016). Moisture dependent thermal modelling of power transformer. IEEE Transactions On Power Delivery, 31 (5) 7470291, 2140-2150. doi: 10.1109/TPWRD.2016.2569123
Cui, Yi, Ma, Hui, Saha, Tapan, Ekanayake, Chandima and Wu, Guangning (2016). Multi-physics modelling approach for investigation of moisture dynamics in power transformers. IET Generation Transmission and Distribution, 10 (8), 1993-2001. doi: 10.1049/iet-gtd.2015.1459
Bandara, Kapila, Ekanayake, Chandima, Saha, Tapan and Ma, Hui (2016). Performance of natural ester as a transformer oil in moisture-rich environments. Energies, 9 (4) 258, 258. doi: 10.3390/en9040258
Cui, Yi, Ma, Hui, Saha, Tapan, Ekanayake, Chandima and Martin, Daniel (2016). Particle tracing modelling on moisture dynamics of oil-impregnated transformer. IET Science, Measurement and Technology, 10 (4), 335-343. doi: 10.1049/iet-smt.2015.0196
Bandara, Kapila, Ekanayake, Chandima, Saha, Tapan Kumar and Annamalai, Pratheep Kumar (2016). Understanding the ageing aspects of natural ester based insulation liquid in power transformer. IEEE Transactions On Dielectrics and Electrical Insulation, 23 (1) 7422567, 246-257. doi: 10.1109/TDEI.2015.004744
Yousof, M. Fairouz M., Ekanayake, Chandima and Saha, Tapan K. (2015). Frequency response analysis to investigate deformation of transformer winding. IEEE Transactions on Dielectrics and Electrical Insulation, 22 (4), 2359-2367. doi: 10.1109/TDEI.2015.004750
Cui, Yi, Ma, Hui, Saha, Tapan and Ekanayake, Chandima (2015). Understanding moisture dynamics and its effect on dielectric response of transformer insulation. IEEE Transactions on Power Delivery, 30 (5) 7094283, 2195-2204. doi: 10.1109/TPWRD.2015.2426199
Bandara, Kapila, Ekanayake, Chandima and Saha, Tapan Kumar (2015). Modelling the dielectric response measurements of transformer oil. IEEE Transactions on Dielectrics and Electrical Insulation, 22 (2) 7076832, 1283-1291. doi: 10.1109/TDEI.2015.7076832
Yousof, Mohd Fairouz Mohd, Ekanayake, Chandima and Saha, Tapan Kumar (2015). Examining the ageing of transformer insulation using FRA and FDS techniques. IEEE Transactions on Dielectrics and Electrical Insulation, 22 (2) 7076829, 1258-1265. doi: 10.1109/TDEI.2015.7076829
Ma, Hui, Saha, Tapan K., Ekanayake, Chandima and Martin, Daniel (2015). Smart transformer for smart grid—intelligent framework and techniques for power transformer asset management. IEEE Transactions on Smart Grid, 6 (2) 7005528, 1026-1034. doi: 10.1109/TSG.2014.2384501
Martin, Daniel, Cui, Yi, Ekanayake, Chandima, Ma, Hui and Saha, Tapan (2015). An updated model to determine the life remaining of transformer insulation. IEEE Transactions on Power Delivery, 30 (1), 395-402. doi: 10.1109/TPWRD.2014.2345775
Chan, Jeffery C., Ma, Hui, Saha, Tapan K. and Ekanayake, Chandima (2014). Self-adaptive partial discharge signal de-noising based on ensemble empirical mode decomposition and automatic morphological thresholding. IEEE Transactions On Dielectrics and Electrical Insulation, 21 (1), 294-303. doi: 10.1109/TDEI.2014.6740752
Jadav, Raj B., Ekanayake, Chandima and Saha, Tapan K. (2014). Understanding the impact of moisture and ageing of transformer insulation on frequency domain spectroscopy. IEEE Transactions On Dielectrics and Electrical Insulation, 21 (1), 369-379. doi: 10.1109/TDEI.2014.6740761
Dehghani Ashkezari, Atefeh, Ma, Hui, Saha, Tapan K. and Ekanayake, Chandima (2013). Application of fuzzy support vector machine for determining the health index of the insulation system of in-service power transformers. IEEE Transactions on Dielectrics and Electrical Insulation, 20 (3) 6518966, 965-973. doi: 10.1109/TDEI.2013.6518966
Ma, Hui, Chan, Jeffery C., Saha, Tapan K. and Ekanayake, Chandima (2013). Pattern recognition techniques and their applications for automatic classification of artificial partial discharge sources. IEEE Transactions on Dielectrics and Electrical Insulation, 20 (2) 6508749, 468-478. doi: 10.1109/TDEI.2013.6508749
Ma, Hui, Ekanayake, Chandima and Saha, Tapan (2012). Power transformer fault diagnosis under measurement originated uncertainties. IEEE Transaction on Dielectrics and Electrical Insulation, 19 (6) 6396956, 1982-1990. doi: 10.1109/TDEI.2012.6396956
Ma, Hui, Saha, Tapan K. and Ekanayake, Chandima (2012). Statistical learning techniques and their applications for condition assessment of power transformer. IEEE Transactions on Dielectrics and Electrical Insulation, 19 (2) 6180241, 481-489. doi: 10.1109/TDEI.2012.6180241
Amrulloh, Yusuf, Abeyratne, Udantha and Ekanayake, Chandima (2010). Gas and optical sensing technology for the field assessment of transformer oil. International Journal of Emerging Electric Power Systems, 11 (4) 7, 1-21. doi: 10.2202/1553-779X.2493
Abeywickrama, Nilanga, Ekanayake, Chandima, Serdyuk, Yuriy V. and Gubanski, Stanislaw M. (2006). Effects of the insulation quality on the frequency response of power transformers. Journal of Electrical Engineering & Technology, 1 (4), 534-542.
Ekanayake, Chandima, Gubanski, Stanislaw, Graczkowski, Andrzej and Walczak, Krzysztof (2006). Frequency response of oil impregnated pressboard and paper samples for estimating moisture in transformer insulation. IEEE Transactions On Power Delivery, 21 (3), 1309-1317. doi: 10.1109/TPWRD.2006.877632
Ekanayake, Chandima (2006). Diagnosis of moisture in transformer insulation - Application of frequency domain spectroscopy. Doktorsavhandlingar vid Chalmers Tekniska Hogskola (2409), 1-166.
Blennow, Jörgen, Ekanayake, Chandima, Walczak, Kzysztof and Gubanski, Stanislaw M. (2006). Field experiences with measurements of dielectric response in frequency domain for power transformer diagnostics. IEEE Transactions on Power Delivery, 21 (2), 681-688. doi: 10.1109/TPWRD.2005.861231
Ekanayake, Chandima, Gubanski, Stanislaw M. and Fernando, M. A. R. M. (2004). Application of dielectric spectroscopy measurements for estimating moisture content in power transformers. KIEE International Transactions on Electrophysics and Application, 4-C (3), 81-90.
Conference Papers
Senavirathna, Shehan Kaushalya, Udawatte, Harith, Harischandra, Nalin, Fernando, Manjula and Ekanayake, Chandima (2023). Image-based condition monitoring of transmission line conductors using image processing and deep neural networks. 2023 IEEE 17th International Conference on Industrial and Information Systems (ICIIS), Peradeniya, Sri Lanka, 25-26 August 2023. Piscataway, NJ, United States: IEEE. doi: 10.1109/iciis58898.2023.10253531
Pallot, Jakob, Ma, Hui, Naranpanawe, Lakshitha and Ekanayake, Chandima (2020). Optimal accelerometer placement for online vibro-acoustic measurement based transformer winding condition monitoring. 2020 8th International Conference on Condition Monitoring and Diagnosis (CMD), Phuket, Thailand, 25-28 October 2020. Piscataway, NJ USA: Institute of Electrical and Electronics Engineers. doi: 10.1109/CMD48350.2020.9287203
Arachchige, Thanuja Gawasingha, Narampanawa, Lakshitha, Ekanayake, Chandima and Ma, Hui (2020). Breakdown mechanisms of XLPE cable with insulation defects. IEEE Conference on Electrical Insulation and Dielectric Phenomena (IEEE CEIDP), East Rutherford, NJ United States, 18-30 October 2020. Piscataway, NJ United States: IEEE. doi: 10.1109/ceidp49254.2020.9437457
Raza, Muhammad Qamar, Nadarajah, Mithulananthan and Ekanayake, Chandima (2018). A multivariate ensemble framework for short term solar photovoltaic output power forecast. 2017 IEEE Power and Energy Society General Meeting, Chicago, IL, United States, 16 - 20 July 2017. Piscataway, NJ, United States: Institute of Electrical and Electronics Engineers. doi: 10.1109/PESGM.2017.8274676
Islam, Mojaharul, Yang, Fuwen, Hossain, Jahangir, Ekanayeke, Chandima and Tayab, Usman Bashir (2018). Battery energy management to minimize the grid fluctuation in residential microgrids. Australasian Universities Power Engineering Conference (AUPEC), Auckland, New Zealand, 27-30 November 2018. Piscataway, NJ, United States: Institute of Electrical and Electronics Engineers. doi: 10.1109/AUPEC.2018.8758005
Mueer, Muhammad, Naranpanawe, Lakshitha and Ekanayake, Chandima (2018). Application of Blind-Source-Separation algorithm for investigating transformer vibration patterns. 7th International Conference on Condition Monitoring and Diagnosis (CMD 2018), Perth, WA, Australia, 23-26 September 2018 . Piscataway, NJ, United States: Institute of Electrical and Electronics Engineers . doi: 10.1109/CMD.2018.8535622
Naranpanawe, Lakshitha, Ekanayake, Chandima and Saha, Tapan (2017). Temperature Dependent Mechanical Properties of Pressboard in Transformer Winding Structure. IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP), Fort Worth, TX, United States, 22-15 October 2017. Piscataway, NJ, United States: IEEE. doi: 10.1109/CEIDP.2017.8257470
Naranpanawe, Lakshitha, Saha, Tapan and Ekanayake, Chandima (2017). Finite element analysis to understand the mechanical defects in power transformer winding clamping structure. 2017 IEEE Power & Energy Society General Meeting, Chicago, IL, United States, 16-20 July 2017. New York, United States: IEEE. doi: 10.1109/PESGM.2017.8274617
Naranpanawe, Lakshitha and Ekanayake, Chandima (2017). Applications of FEM in condition monitoring of transformer clamping system. Australasian Universities Power Engineering Conference (AUPEC), Melbourne, Australia, 19-22 November 2017. Piscataway, NJ, United States: IEEE. doi: 10.1109/AUPEC.2017.8282419
Naranpanawe, Lakshitha and Ekanayake, Chandima (2016). Finite element modelling of a transformer winding for vibration analysis. 2016 Australasian Universities Power Engineering Conference, AUPEC 2016, Brisbane, QLD, Australia, 25 - 28 September 2016. Piscataway, NJ, United States: Institute of Electrical and Electronics Engineers. doi: 10.1109/AUPEC.2016.07749344
Raza, Muhammad Qamar, Nadarajah, Mithulananthan and Ekanayake, Chandima (2016). An improved WT and NN ensemble demand forecast model for PV integrated smart buildings. 2016 IEEE Innovative Smart Grid Technologies - Asia, ISGT-Asia 2016, Melbourne, Australia, 28 November - 1 December 2016. Piscataway, NJ, United States: Institute of Electrical and Electronics Engineers. doi: 10.1109/ISGT-Asia.2016.7796484
Naranpanawe, Lakshitha, Saha, Tapan and Ekanayake, Chandima (2016). Moisture and temperature effects on power transformer winding clamping pressure. 2016 IEEE PES Asia Pacific Power and Energy Engineering Conference, APPEEC 2016, Xian, China, 25 - 28 October 2016. Piscataway, NJ, United States: Institute of Electrical and Electronics Engineers. doi: 10.1109/APPEEC.2016.7779473
Raza, Muhammad Qamar, Nadarajah, Mithulananthan and Ekanayake, Chandima (2016). An improved neural ensemble framework for accurate PV output power forecast. 2016 Australasian Universities Power Engineering Conference, AUPEC 2016, Brisbane, QLD, Australia, 25 - 28 September 2016. Piscataway, NJ, United States: Institute of Electrical and Electronics Engineers. doi: 10.1109/AUPEC.2016.07749296
Saha, T. K., Martin, D., Ma, H., Ekanayake, C., Russell, G., Buckley, G., Gray, T. and Caldwell, G. (2016). Smart monitoring of power transformers: project update. CIGRE Session 46, Paris, France, 21-26 August 2016. CIGRE.
Naranpanawe, W. M. L. B., Bandara, K. M. K. S., Saha, T. K., Ekanayake, C. and Annimalai, Pratheep Kumar (2015). Effect of pressboard ageing on power transformer mechanical vibration characteristics. IEEE PES Asia-Pacific Power and Energy Engineering Conference, Brisbane, QLD, Australia, 15-18 November 2015. Piscataway, NJ, United States: IEEE. doi: 10.1109/APPEEC.2015.7380951
Bandara, Kapila, Saha, Tapan K. and Ekanayake, Chandima (2015). Influence of moisture and ageing on dielectric response of ester and mineral oil impregnated pressboard insulation. IEEE Asia-Pacific Power and Enegy Engineering, Brisbane, QLD, Australia, 15-18 November 2015. Piscataway, NJ, United States: IEEE. doi: 10.1109/APPEEC.2015.7380981
Ma, Hui, Chan, Jeffery, Saha, Tapan, Seo, Junhyuck and Ekanayake, Chandima (2015). Advanced signal processing techniques for transformer condition assessment. IEEE International Conference on the Properties and Applications of Dielectric Materials, ICPADM, Sydney, Australia, 19-22 July 2015. Piscataway, NJ, United States: Institute for Electrical and Electronic Engineers. doi: 10.1109/ICPADM.2015.7295217
Yousof, M. F. M., Ekanayake, C. and Saha, T. K. (2015). An investigation on the influence of tap changer on Frequency Response Analysis. IEEE International Conference on the Properties and Applications of Dielectric Materials, ICPADM, Sydney, Australia, 19-22 July 2015. Piscataway, NJ, United States: Institute for Electrical and Electronic Engineers. doi: 10.1109/ICPADM.2015.7295434
Bandara, Kapila, Ekanayake, Chandima and Saha, Tapan Kumar (2015). Compare the performance of natural ester with synthetic ester as transformer insulating oil. International Conference on the Properties and Applications of Dielectric Materials (ICPADM), Sydney, NSW, Australia, 19-22 July 2015. Piscataway, NJ, United States: IEEE (Institute for Electrical and Electronic Engineers). doi: 10.1109/ICPADM.2015.7295437
Cui, Yi, Martin, Daniel, Saha, Tapan, Ma, Hui, Ekanayake, Chandima and Lelekakis, Nick (2015). Multi-variable approach for evaluating transformer paper insulation. International Conference on the Properties and Applications of Dielectric Materials (ICPADM), Sydney, NSW, Australia, 19-22 July 2015. Piscataway, NJ, United States: IEEE (Institute for Electrical and Electronic Engineers). doi: 10.1109/ICPADM.2015.7295273
Bandara, Kapila, Ekanayake, Chandima and Saha, Tapan K. (2015). Comparative study to understand behaviour of natural ester as transformer insulating liquid. IEEE International Conference on Industrial and Information Systems (ICIIS), Peradeniya, Kandy, Sri Lanka, 18-20 December 2015. Piscataway, NJ, United States: IEEE. doi: 10.1109/ICIINFS.2015.7398996
Bandara, Kapila, Ekanayake, Chandima, Saha, Tapan and Ma, Hui (2015). Investigation of moisture influence on dielectric response of ester oil impregnated pressboard. Power and Energy Society General Meeting, Denver, CO, United States, 26-30 July 2015. Piscataway, NJ, United States: IEEE (Institute for Electrical and Electronic Engineers). doi: 10.1109/PESGM.2015.7286020
Cui, Yi, Ma, Hui, Saha, Tapan, Ekanayake, Chandima and Martin, Daniel (2015). Time Domain Diffusion-Driven Dielectric Response Model for Investigation of Moisture Dynamics in Transformers Insulation. IEEE Power and Energy Society General Meeting, Denver, CO United States, 26-30 July 2015. NEW YORK: IEEE Computer Society. doi: 10.1109/PESGM.2015.7285860
Yousof, M. F. M., Saha, T. K. and Ekanayake, C. (2014). Investigating the Sensitivity of Frequency Response Analysis on Transformer Winding Structure. IEEE PES General Meeting, National Harbor, MD United States, 27-31 July 2014. Piscataway, NJ United States: Institute of Electrical and Electronics Engineers. doi: 10.1109/PESGM.2014.6938945
Cui, Yi, Ma, Hui, Saha, Tapan and Ekanayake, Chandima (2014). A diffusion-driven model for investigating moisture effects on dielectric response measurement of transformer insulation. 2014 IEEE Power and Energy General Meeting (PES 2014), National Harbor, MD,United States, 27-31 July 2014. Piscataway, NJ, United States: IEEE. doi: 10.1109/PESGM.2014.6938883
Chan, Jerrery C., Ma, Hui, Saha, Tapan K. and Ekanayake, Chandima (2014). Stochastic noise removal on partial discharge measurement for transformer insulation diagnosis. 2014 IEEE PES General Meeting: Conference and Expositio, National Harbor, MD, United States, 27-31 July 2014. Piscataway, NJ, United States: IEEE. doi: 10.1109/PESGM.2014.6938913
Bandara, Kapila, Ekanayake, Chandima and Saha, Tapan Kumar (2014). Comparative study for understanding the behaviour of natural ester with mineral oil as a transformer insulating liquid. IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), Des Moines, IA, United States, 19-22 October 2014. Piscataway NJ United States: IEEE. doi: 10.1109/CEIDP.2014.6995828
Saha, T. K., Ma, H., Ekanayake, C., Martin, D. and Allan, D. (2014). Pattern recognition techniques for determining the health index of oil-paper insulation of in-service power transformers. 45th International Conference on Large High Voltage Electric Systems 2014, CIGRE 2014, Paris, France, 24-29 August 2014. CIGRE.
Martin, Daniel, Ma, Hui, Ekanayake, Chandima, Saha, Tapan, Lelekakis, Nick and Williams, Kerry (2013). State of the Art Review On Managing Vegetable Oil Filled Transformers. Cigre Study Communities B3 / D1 Colloquium Brisbane 2013, Brisbane, QLD, Australia, 8 - 13 September 2013. Brisbane, QLD, Australia: CIGRE.
Yousof, M. F. M., Ekanayake, C. and Saha, T. K. (2013). Locating inter-disc faults in transformer winding using frequency response analysis. 2013 Australasian Universities Power Engineering Conference, AUPEC 2013, Hobart, TAS, Australia, 29 September - 3 October 2013. Piscataway, NJ, United States: IEEE. doi: 10.1109/AUPEC.2013.6725454
Yousof, M. F. M., Ekanayake, C. and Saha, T. K. (2013). Study of transformer winding deformation by frequency response analysis. 2013 IEEE Power and Energy Society General Meeting, PES 2013, Vancouver, BC, 21-25 July 2013. Piscataway, NJ United States: I E E E. doi: 10.1109/PESMG.2013.6672525
Chan, Jeffery C., Ma, Hui, Saha, Tapan K. and Ekanayake, Chandima (2013). Adaptive blind equalization for automatic partial discharge signal processing and pattern classification. 2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, Chenzhen, China, 20-23 October 2013. Piscataway, NJ, United States: IEEE. doi: 10.1109/CEIDP.2013.6748108
Cui, Yi, Ekanayake, Chandima, Saha, Tapan K., Du, Peidong and Ma, Hui (2013). Finite element method modeled dielectric response for condition evaluation of transformer insulation. 2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, Chenzhen, China, 20-23 October 2013. Piscataway, NJ, United States: IEEE. doi: 10.1109/CEIDP.2013.6748314
Martin, D., Lelekakis, N., Ekanayake, C., Saha, T. and Ma, H. (2013). Improving measurement techniques of power transformer insulation: a study of the intermolecular interactions between water and vegetable oil based dielectrics. CEIDP 2013: Annual Report Conference on Electrical Insulation and Dielectric Phenomena, Chenzhen, China, 20-23 October, 2013. Piscataway, NJ, United States: Institute of Electrical and Electronics Engineers. doi: 10.1109/CEIDP.2013.6748239
Jadav, Raj B., Saha, Tapan K. and Ekanayake, Chandima (2013). Diagnostics of transformer insulation based on dielectric response measurements. 1st International Conference on Condition Assessment Techniques in Electrical Systems, IEEE CATCON 2013, Kolkata, India, 6 - 8 December 2013. Piscataway, NJ United States: I E E E. doi: 10.1109/CATCON.2013.6737504
Yousof, M. F. M., Ekanayake, Chandima, Saha, Tapan K. and Ma, Hui (2012). A study on suitability of different transformer winding models for frequency response analysis. 2012 IEEE Power and Energy Society General Meeting, San Diego, United States, 22-26 July 2012. Piscataway, NJ, United States: IEEE. doi: 10.1109/PESGM.2012.6345217
Ma, H., Saha, T. K., Ekanayake, C. and Allen, D. (2012). Modern machine learning techniques for power transformer condition assessment. CIGRE Session 44, Paris, France, 26-31 August 2012. Paris, France: Council on Large Electric Systems (CIGRE).
Ma, Hui, Saha, Tapan K. and Ekanayake, Chandima (2012). Interpretation of dielectric response measurements of transformer insulation under temperature variations and transient effects. 2012 IEEE Power and Energy Society General Meeting, San Diego, United States, 22-26 July 2012. Piscataway, NJ, United States: IEEE. doi: 10.1109/PESGM.2012.6344903
Chan, Jeffery C., Ma, Hui, Saha, Tapan K. and Ekanayake, Chandima (2012). A novel level-based automatic wavelet selection scheme for partial discharge measurement. 2012 22nd Australasian Universities Power Engineering Conference, Bali, Indonesia, 26-29 September 2012. Piscataway, NJ, United States: IEEE.
Jadav, Raj B., Ekanayake, Chandima and Saha, Tapan K. (2012). Impact of moisture and ageing on the dielectric response of transformer insulation. Universities Power Engineering Conference (AUPEC), 2012 22nd Australasian, Bali, Indonesia, 26 – 29 September 2012. Piscataway, NJ, United States: IEEE (Institute for Electrical and Electronic Engineers).
Jadav, Raj B., Saha, Tapan K. and Ekanayake, Chandima (2012). Multifractal analysis on polarisation and depolarisation current of the transformer insulation. 2012 22nd Australasian Universities Power Engineering Conference, Bali, Indonesia, 26-29 September 2012. Piscataway, NJ, United States: IEEE.
Dehghani Ashkezari, Atefeh, Ma, Hui, Ekanayake, Chandima and Saha, Tapan K. (2012). Multivariate analysis for correlations among different transformer oil parameters to determine transformer health index. 2012 IEEE Power and Energy Society General Meeting, San Diego, United States, 22- 26 July 2012. Piscataway, NJ, United States: IEEE. doi: 10.1109/PESGM.2012.6345231
Ma, Hui, Saha, Tapan K. and Ekanayake, Chandima (2011). Predictive learning and information fusion for condition assessment of power transformer. 2011 IEEE Power and Energy Society General Meeting, Detroit, MI, United States, 24-29 July 2011. Piscataway, NJ, United States: IEEE. doi: 10.1109/PES.2011.6039069
Dehghani Ashkezari, Atefeh, Ma, Hui, Saha, Tapan K. and Chandima Ekanayake (2011). Investigation of non-linearity in dielectric response measurements for transformer insulation diagnosis. IEEE Power and Energy Society’s Innovative Smart Grid Technologies Asia 2011 Conference (IEEE PES ISGT Asia 2011), Perth, W.A., Australia, 13-16 November 2011. Piscataway, NJ, United States: IEEE. doi: 10.1109/ISGT-Asia.2011.6167113
Ma, Hui, Saha, Tapan K. and Ekanayake, Chandima (2011). Machine learning techniques for power transformer insulation diagnosis. 21st Australasian Universities Power Engineering Conference (AUPEC), 2011, Brisbane, Australia, 25-28 September 2011. Piscataway, NJ, United States: IEEE.
Dehghani Ashkezari, Atefeh, Saha, Tapan K., Ekanayake, Chandima and Ma, Hui (2011). Evaluating the accuracy of different DGA techniques for improving the transformer oil quality interpretation. AUPEC 2011: Australasian Universities Power Engineering Conference. Integrating Renewables into the Grid, Gardens Point, Brisbane, Australia, 25-28 September 2011. Pitscataway, NJ, U.S.A.: Institute for Electrical and Electronic Engineers (IEEE).
Jadav, Raj B., Saha, Tapan K. and Ekanayake, Chandima (2011). Transformer diagnostics using dissolved gas analysis and polarisation and depolarisation current measurements - A case study. 21st Australasian Universities Power Engineering Conference (AUPEC 2011), Brisbane, Australia, 25-28 September 2011. Piscataway, NJ, United States: IEEE.
Jadav, Raj B., Saha, Tapan K. and Ekanayake, Chandima (2011). Understanding moisture diffusion process in oil-impregnated pressboard insulation of transformer. 2011 IEEE Power and Energy Society General Meeting (IEEE PES-GM), Detroit, MI, United States, 24-28 July 2011. San Diego, United States: IEEE. doi: 10.1109/PES.2011.6039501
Ekanayake, Chandima, Ma, Hui and Saha, Tapan (2010). Past experience and future developments toward the safeguarding of power transformers. 6th International Conference on Electrical and Computer Engineering, ICECE 2010, Dhaka, Bangladesh, 18-20 December 2010. Piscataway, NJ, United States: IEEE. doi: 10.1109/ICELCE.2010.5700682
Jadav, Raj B., Ekanayake, Chandima and Saha, Tapan K. (2010). Dielectric response of transformer insulation - Comparison of time domain and frequency domain measurements. 2010 9th International Power and Energy Conference, IPEC 2010, Singapore, 27-29 October 2010. Piscataway, NJ, United States: IEEE. doi: 10.1109/IPECON.2010.5697105
Ekanayake, Chandima, Saha, Tapan K., Ma, Hui and Allan, David (2010). Application of polarization based measurement techniques for diagnosis of field transformers. IEEE Power and Energy Society 2010 General Meeting, Minneapolis, Minnesota, USA, 25 July - 29 July 2010. New York, N.Y.: Institute of Electrical and Electronics Engineers, Inc. : IEEE Power Engineering Society. doi: 10.1109/PES.2010.5589446
Ma, Hui, Saha, Tapan K. and Ekanayake, Chandima (2010). Power transformer insulation diagnosis under measurement originated uncertainties. IEEE Power and Energy Society 2010 General Meeting, Minneapolis, MN, USA, 25-29 July 2010. Piscataway, NJ, United States: IEEE. doi: 10.1109/PES.2010.5589395
Jayantha, G. A., Fernando, M. A. R. M. and Ekanayake, C. M. B. (2009). Monitoring of moisture on stator winding insulation during drying process. 4th International Conference on Industrial and Information Systems 2009, ICIIS 2009, Peradeniya, 28 - 31 December 2009. Piscataway, NJ United States: I E E E. doi: 10.1109/ICIINFS.2009.5429814
Ekanayake, Chandima, Saha, Tapan, Thomas, Andrew and Ma, Hui (2009). Reliability of dielectric response measurements for estimating moisture in oil impregnated paper insulation. Energy 21C: The 10th International Transmission and Distribution Conference & Exhibition (Electricity and Gas Networks), Melbourne, VIC, Australia, 6-9 September 2009.
Ma, H, Saha, T.K., Thomas, A. and Ekanayake, C. (2009). Intelligent framework and techniques for power transformer insulation diagnosis. IEEE Power and Energy Society (PES) 2009 General Meeting, Calgary, Alberta, Canada, 26-30 July 2009. Piscataway, NJ, United States: IEEE. doi: 10.1109/PES.2009.5275876
Ranawana, S., Ekanayaka, C.M.B., Kurera, N.A.S.A., Fernando, M.A.R.M. and Perera, K.A.R. (2008). Analysis of insulation characteristics of coconut oil as an alternative to the liquid insulation of power transformers. 2008 IEEE Region 10 Colloquium and the Third International Conference on Industrial and Information Systems, Kharagpur, India, 8-10 December, 2008. Piscataway, New Jersey, USA: IEEE.
Abeywickrama, N., Ekanayake, C. and Gubanski, S. M. (2006). Effects of the insulation quality on the frequencyrResponse of power transformers. International Conference on Condition Monitoring and Diagnosis, Changwon, Korea, 2-5 April, 2006.
Blennow, J., Bartnicki, A., Dernfalk, A., Ekanayake, C. and Gubanski, S. M. (2006). Dielectric spectroscopy measurements on power transformers-field experiences. International Conference on Condition Monitoring and Diagnosis, Changwon, Korea, 2-5 April, 2006.
Blennow, J., Dernfalk, A., Walczak, K., Ekanayake, C., Koestinger, P., Karlsson, L., Gäfvert, L., Gubanski S. M. and Bartnicki, A. (2005). Sequential comparative study of dielectric response and analyses of oil and paper from a power transformer undergoing repair. 14th International Symposium on High Voltage Engineering, Beijing, China, 25-29 August, 2005. Amsterdam, The Netherlands: IOS Press.
Gielniak, J., Ekanayake, C., Walczak, K., Graczkowski, A. and Gubanski, S. M. (2005). Dielectric responses of new and aged transformer pressboard in dry and wet states. 2005 International Symposium on Electrical Insulating Materials, Kitakyushu, Japan, 5-9 June, 2005. Piscataway, New Jersey, USA: IEEE. doi: 10.1109/ISEIM.2005.193569
Ekanayake, C., Graczkowski, A., Walczak, K. and Gubanski, S. M. (2004). Dielectric spectroscopy measurements on oil impregnated paper/pressboard samples. 2nd Advance in Processing, Testing and Application of Dielectric Materials (APTADM 2004), Wroclaw, Poland, 15-17 September, 2004.
Blennow, J., Ekanayake, C., Bartnicki, A. and Gubanski, S. M. (2004). Experiences from on-site dielectric spectroscopy measurements on power transformers. 2nd Advance in Processing, Testing and Application of Dielectric Materials (APTADM 2004), Wroclaw, Poland, 15-17 September, 2004.
Ekanayake, C., Gubanski, S. M., Hribernik, W. and Fernando, M. (2003). Calibrating the results of dielectric measurements on field aged power transformers using oil analyses and similar measurements on well-defined pressboard samples. Nordic Insulation Symposium 2003 (NORD-IS 03), Tampere, Finland, 11-13 June, 2003.
Ekanayake, C., Gubanski, S. M., Mularachchi, K. D. and Fernando, M. A.R.M. (2001). Diagnostic of power transformers in Sri Lanka: Application of dielectric spectroscopy in frequency domain. Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Conference, Cincinnati, OH United States, 18 October 2001. Piscataway, NJ United States: IEEE. doi: 10.1109/EEIC.2001.965763
Research Report
Saha, Tapan K., Ma, Hui, Ekanayake, Chandima and Martin, Dan (2017). Development of smart power transformers with intelligent monitoring, diagnostic and life management systems. St Lucia, QLD Australia: University of Queensland.