Intelligent agent-based system using dissolved gas analysis to detect incipient faults in power transformers

Akbari, Asghar; Setayeshmehr, A.; Borsi, H.; Gockenbach, E.; Fofana, I.

doi:10.1109/mei.2010.5599977

Cited by 81 publications

(40 citation statements)

References 15 publications

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“…The Duval's Triangle diagnostic method for oil-insulated high-voltage equipment (mainly transformers) was developed by Michel Duval [6]. The triangle representations allow following easily, graphically and visually the evolution of faults with time objectives.…”

Section: Duval Triangle Methodsmentioning

confidence: 99%

“…Several individual DGA users have also developed their own graphical software. Since all these methods are based on heuristic and not on scientific formulation, combined DGA diagnostic may reduce the risk of mistaken diagnostics and enhance accuracy [6].…”

Section: Research Problemmentioning

confidence: 99%

“…Since all these methods are based on heuristic in nature and not based on scientific formulation, the applicant and his German collaborators have recently proposed a combined DGA diagnostic that helps reducing the risk of mistaken diagnostics and enhance accuracy [6]. Recent progress in the applicant's laboratory [30] has shown that contaminants produce gases as all.…”

Section: Introductionmentioning

confidence: 99%

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Contribution to the improvement of the dissolved gas analysis techniques /

Ghalkhani¹

2012

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There is a general agreement that in service conditions the quality of mineral insulating oils gradually deteriorates under the impact of electrical, thermal and environmental stresses. It is also widely accepted that only the incipient electrical failures such as hot spots and partial discharges are responsible for the gassing of oil. Knowing that the resulting fault gases dissolve in the oil, the technique of Dissolved Gas Analysis (DGA) was developed to detect incipient failures in the transformer. DGA has now become a standard in the utility industry throughout the world and is considered to be the most important oil test for insulating liquids in electrical apparatus. More importantly, an oil sample can be taken at anytime from most equipment without having to take it out of service, allowing a "window" inside the electrical apparatus that helps with diagnosing and trouble-shooting potential problems. This thesis intends to show that the gassing of oil is a more complex phenomenon.In order to emphasize the role played by contaminants in the gassing of oil, fundamental investigations were undertaken. The amount of gases evolved under the impact of electrical stress (ASTM D6180) by a sample of new and aged oil with/without paper was accurately measured along with some physicochemical properties, to assess the relationship between the cause and the symptoms of oil or oil-paper insulation deterioration. The outcome of these investigations provided experimental evidence that the chemical composition of hydrocarbon blend, the oil born decay products and the solid insulation are also contributing factors to oil gassing. Since this finding may affect the diagnostics predicted by some DGA techniques, some thorough investigations were performed. New, aged oil and reclaimed aged oil samples were submitted to thermal and electrical stresses (considering various scenarios) and the dissolved gases analyzed by chromatography. Three of the most used DGA techniques, namely the Duval's Triangle Roger's and Domenburg's ratios were implemented in Labview based software to predict the diagnostic. The obtained results provide experimental evidence that oil born decay products may affect the diagnostics predicted by some DGA techniques.Although such a research is still in a preliminary stage, some very stimulating results have been

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Section: Duval Triangle Methodsmentioning

confidence: 99%

Section: Research Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Contribution to the improvement of the dissolved gas analysis techniques /

Ghalkhani¹

2012

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“…As transformers age, they suffer various stresses that can contribute to a multiplicity of failure mechanisms. Proper online DGA monitoring and diagnostic tools could help utilities to avoid unplanned failures, extend transformer useful life and lower maintenance costs [157].…”

Section: Dga (Dissolved Gas Analysis)mentioning

confidence: 99%

Effect of Loads and Other Key Factors on Oil-Transformer Ageing: Sustainability Benefits and Challenges

et al. 2015

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Transformers are one of the more expensive pieces of equipment found in a distribution network. The transformer's role has not changed over the last decades. With simple construction and at the same time mechanically robust, they offer long term service that on average can reach half a century. Today, with the ongoing trend to supply a growing number of non-linear loads along with the notion of distributed generation (DG), a new challenge has arisen in terms of transformer sustainability, with one of the possible consequences being accelerated ageing. In this paper we carefully review the existing studies in the literature of the effect of loads and other key factors on oil-transformer ageing. The state-of-the-art is reviewed, each factor is analysed in detail, and in the end a smart transformer protection method is sought in order to monitor and protect it from upcoming challenges.

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“…The mentioned conventional DGA interpretation schemes have been updated recently. A. Akbari et al [163] have proposed an artificial neural network and agent based software diagnosis tools to automate the interpretation of DGA data and reduce the risk of mistaken diagnosis. Duval pentagon is a recently developed graphical DGA interpretation technique which is based on use of five main hydrocarbon gases [164].…”

Section: Formation Of Dissolved Gases In Transformers and Methods Of Amentioning

confidence: 99%

Condition monitoring of biodegradable oil filled transformer

Mudiyanselage¹,

Bandara²

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Natural and synthetic ester insulating oils have higher fire points and excellent biodegradable characteristics. Therefore, in order to reduce the adverse environmental impact and to improve the fire safety of transformers, there is an increasing demand for natural and synthetic ester insulating liquids as a transformer insulating oil. However, present understanding on ageing behaviour of ester oil-paper composite insulation system and knowledge on application of existing condition monitoring tools for ester based insulation systems are inadequate. This impedes the cost effective and reliable field applications of ester insulating oils, particularly application of natural esters. To reduce this knowledge gap, series of controlled ageing experiments are performed in this research project to provide a better and comprehensive understanding on ageing behaviour of ester oil-paper insulation systems. Furthermore, applicability of existing chemical and electrical based condition monitoring techniques for ester oil-paper insulation systems is systematically investigated in this research project.In this thesis, ageing behaviour of dry pressboard insulation in mineral and three different ester insulating oils under simulated transformer operating environment is investigated. Moreover, the ageing behaviour of natural ester-pressboard composite insulation in moisture rich environment is also compared with that of mineral oil-pressboard system. Degree of polymerisation of pressboard samples measured at different ageing interval is used in this research to determine the ageing condition of pressboard. Moreover, applicability of oil related diagnostic parameters such as concentration of dissolved furanic compounds, acidity value, Dielectric Dissipation Factor (DDF), viscosity and colour to assess the degree of degradation of both ester and mineral insulating oils is thoroughly investigated in this research project. The potential of FTIR (Fourier Transform Infrared spectroscopy) techniques for characterising the degree of degradation of paper insulation is also discussed in this thesis. In addition, this thesis concentrates on characterisation of the charge dynamic in insulating oil through modelling of their dielectric responses.The comparison of gassing behaviour of ester and mineral insulating oils under two different low temperature faults and low energy electric discharge condition is also presented in this thesis.Dissolved Gas Analysis (DGA) results presented in this thesis depicts that faults gases detected in ester and mineral oil samples subjected to a similar fault are akin in type but quantitatively different. The quantity of fault gases produced in two different natural ester oils is also dissimilar.For example, soy-based natural ester produces a large quantity of ethane (C2H6) under low temperature overheating condition than sunflower oil based natural ester. Therefore, this research project investigates the applicability of well-established DGA interpretation schemes namely Duval II | P a g e triangle, IE...

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Intelligent agent-based system using dissolved gas analysis to detect incipient faults in power transformers

Cited by 81 publications

References 15 publications

Contribution to the improvement of the dissolved gas analysis techniques /

Contribution to the improvement of the dissolved gas analysis techniques /

Effect of Loads and Other Key Factors on Oil-Transformer Ageing: Sustainability Benefits and Challenges

Condition monitoring of biodegradable oil filled transformer

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