Transformer Oil Health Monitoring Techniques—An Overview

Rengaraj, R.; Venkatakrishnan, G. R.; Moorthy, Pranav; Pratyusha, Ravi; Ritika, .; Veena, K.

doi:10.1007/978-981-15-5029-4_12

Cited by 5 publications

(1 citation statement)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One of the elements of insulation of high-voltage power transformers is petroleum insulating oils. As shown in [2,3], the condition of transformer oils has a significant role in ensuring the operational reliability of transformers. Oil oxidation products have a negative effect not only on the electrical strength of the liquid insulation, but also contribute to a reduction in the mechanical strength of the cellulose insulation, which leads to a reduction in the transformer service life.…”

mentioning

confidence: 99%

Analysis of distribution laws of transformer oil indicators in 110-330 kV transformers

Shutenko

Ponomarenko

2021

Electrical Engineering & Electromechanics

View full text Add to dashboard Cite

Introduction. Ensuring the operational reliability of power transformers is an urgent task for the power industry in Ukraine and for most foreign countries. One of the ways to solve this problem is the correction of maximum permissible values of insulation parameters. However, such a correction is fundamentally impossible without an analysis of the laws of distribution of diagnostic indicators in the equipment with different states. The purpose of the research is to analyse the laws of distribution of the quality indicators of transformer oil with different states in 110 and 330 kV transformers. Novelty. It was found that both 330 kV autotransformers and 110 kV transformers have the displacements between the mathematical expectations of the distribution density of usable oil indicators. It caused by different service life of the analysed transformers and different values of load factors. This indicates the need to consider the influence of these factors when correcting the maximum permissible values of oil indicators. Also, the presence of displacement between the distribution densities of some indicators of usable oil in 110 kV transformers and 330 kV autotransformers has been revealed. It indicates a different intensity of oxidation reactions in transformers with different voltage class. In order to reduce the heterogeneity of initial data the procedure of statistical processing of in-service test results has been proposed as a method. This procedure combines the use of a priori information about the service life of equipment and values of load factors with the elements of statistical hypothesis testing. The results of the analysis of the distribution laws of transformer oil indicators with different states have shown that for both usable and unusable oil the values of oil indicators obey the Weibull distribution. Values of the shape and scale parameters for each of the obtained indices arrays have been obtained, as well as calculated and critical values of the goodness-of-fit criteria. Practical value. Obtained values of the distribution law parameters of the transformer oil indicators with different states, considering the service life and operating conditions allow to perform the correction of the maximum permissible values of the indicators using the statistical decision-making methods.

show abstract

mentioning

confidence: 99%

Analysis of distribution laws of transformer oil indicators in 110-330 kV transformers

Shutenko

Ponomarenko

2021

Electrical Engineering & Electromechanics

View full text Add to dashboard Cite

show abstract

Effect of purification process on the thermal conductivity and breakdown voltage of inhibited, isoparaffinic transformer oil used in electric train

Ali¹,

Deenesh

Kadir³

et al. 2021

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Presence of water content or moisture promotes premature thermal aging which hampers the properties of inhibited, isoparaffinic transformer oil used in electric multiple unit (EMU) train. Unpurified aged oil with high water presence is collected from the traction transformer and contaminants is removed using Double-Stage Vacuum Insulation Oil Regeneration Filtration Machine to produce purified aged oil. New transformer oil is selected as a control sample. The objective of this study is to investigate the effect of oil purification process on the thermal conductivity and breakdown voltage of the oil samples. Thermal conductivity measurement was done from temperatures of 30°C to 70°C. Dielectric characteristics are shown by analyzing breakdown voltage. Unpurified oil shows an increment from 1.54% to 3.13% as compared to new oil in response to temperature variation whereas purified oil has the lowest thermal conductivity value. However, breakdown voltage of purified oil is higher than unpurified oil and slightly lower than new oil. From this, it can be inferred that presence of water gives positive impact towards thermal properties and vice versa to dielectric properties. A relationship between thermal conductivity, breakdown voltage and presence of water has been deduced at the end of the study.

show abstract

A New Method for Estimating Transformer Health Index Based on Ultraviolet-Visible Spectroscopy

Darwish

Hassan

Abdel-Gawad

et al. 2022

2022 23rd International Middle East Power Systems Conference (MEPCON)

View full text Add to dashboard Cite

Transformer Oil Health Monitoring Techniques—An Overview

Cited by 5 publications

References 19 publications

Analysis of distribution laws of transformer oil indicators in 110-330 kV transformers

Analysis of distribution laws of transformer oil indicators in 110-330 kV transformers

Effect of purification process on the thermal conductivity and breakdown voltage of inhibited, isoparaffinic transformer oil used in electric train

A New Method for Estimating Transformer Health Index Based on Ultraviolet-Visible Spectroscopy

Contact Info

Product

Resources

About