An experimental study of partial discharge analysis on environmental friendly insulating oil as alternate insulating material for transformer

Mariprasath, T.; Ravindaran, M

doi:10.1007/s12046-022-01946-8

Cited by 5 publications

(2 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An increased power density with a reduced transformer size demands an enhanced cooling system, which was addressed by Ngo et al 23 In the study, an 18 kW, 500 kHz Planar transformers, a potted transformer with converging ducts and turbulent generators was proposed, which reduces the hot spot temperature by 20°. In an experimental investigation of the ageing characteristics of insulation oil, Mariprasath and Ravindran 24 found that the rate of deterioration characteristics of rice bran oil and sunflower oil is lesser than that of conventional oil. A numerical study made by Diaz et al 25 proposed Rapeseed oil as the reliable replacement of conventional mineral oil in transformer cooling which produces the same rate of cooling for the given rate of heat generation.…”

Section: Introductionmentioning

confidence: 99%

A numerical study on effect of intra and inter spaced winding configuration on performance of oil forced transformer cooling system

Muralikrishna,

Satyanarayana Reddy,

Sahu

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

The present work aims at investigating, numerically, the heat transfer characteristics of transformer cooling system under forced circulation for three different winding configurations. The purpose of a transformer cooling system is to keep the hot spot temperature within the critical value for a long life of transformer, which increases with enhanced cooling of transformer windings. Thus, two different winding configurations are modeled by providing space within the windings (an intra-space model) and in between the windings (an inter-space model) to improve the fluid-solid interaction. A conventional winding, without spacing, is also modeled for comparative study. A 315 kVA, 3-phase core type transformer is taken as the base model from which the winding and core specifications are obtained analytically. Parameters chosen to measure the influence of winding configuration are local temperature distribution in the windings and core and maximum transformer temperature. Results are obtained for all three models with varying space for various cooling mediums like naphthenic oil, silicon oil, and synthetic ester oil at flow velocities ranging from 0.72 m/s to 2.16 m/s. It is observed that the gap between the windings, interspacing, decreases the secondary winding temperatures, while it increases the core and primary winding temperatures. However, the intra spacing configuration finds a drop in local temperatures at all locations of the transformer windings and core. The enhanced heat dissipation to the cooling agent, with intra spacing winding configuration, reduces the maximum transformer temperature. Contrasting to the above, the inter-space model has an adverse effect on maximum temperature at all widths of space considered. Quantitatively, the space within the transformer reduces the maximum temperature by 5% in comparison with the space between the windings. The increased velocity of the cooling medium, Naphthenic oil, from 0.72 m/s to 2.16 m/s reduces the maximum temperature by 4.5 units. The study made to know the role of cooling medium discloses that the synthetic ester oil shows better performance for reducing temperature values due to its highly viscous nature.

show abstract

Section: Introductionmentioning

confidence: 99%

A numerical study on effect of intra and inter spaced winding configuration on performance of oil forced transformer cooling system

Muralikrishna,

Satyanarayana Reddy,

Sahu

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

show abstract

“…This increases the losses in power transformers. If the losses in the power transformers are not kept under control, it causes the temperature in the power transformer core to increase and the insulation deteriorates (Pamuk, 2017;Mariprasath and Ravindaran, 2022). Load losses in power transformers are examined in three main sections.…”

Section: Introductionmentioning

confidence: 99%

Determining Accuracy of Temperature Limit Change in Power Transformer Core Using Temperature-Time Parameter Method

PAMUK

2023

Black Sea Journal of Engineering and Science

View full text Add to dashboard Cite

The efficient transmission of electrical energy depends on amplifying voltage values with power transformers. To obtain higher efficiency from transformers, the core and winding type of transformer, the geometric structure of the core, and the shaping techniques in the windings are changed. This requires modeling transformer windings with equivalent circuits and calculating the inductance and electrical parameters appropriately. In this study, two-dimensional (2D) finite element solutions with energy perturbation and flux-coupling methods are used. The correctness of the inductance values of transformer windings was established, and the design was performed, by considering the inductance and electrical parameter values, which are comparable to the energy perturbation and flux connection. However, when two-dimensional calculated fields are used, the flux coupling method requires less computation and gives numerically more accurate results than the energy perturbation method. So, it is concluded that the flux-coupling approach should be chosen as the preferred method for calculating the inductance and electrical parameters of transformer windings. The numerical properties and equivalence of energy perturbation and flux-connection methods, the “apparent” inductance value of the primary and secondary field windings of power transformer operating under transient conditions, using the temperature-time parameter method, are calculated and its accuracy is demonstrated.

show abstract

Natural esters as sustainable alternating dielectric liquids for transformer insulation system: analyzing the state of the art

Rafiq,

Shafique,

Ateeq

et al. 2023

Clean Techn Environ Policy

View full text Add to dashboard Cite

An experimental study of partial discharge analysis on environmental friendly insulating oil as alternate insulating material for transformer

Cited by 5 publications

References 17 publications

A numerical study on effect of intra and inter spaced winding configuration on performance of oil forced transformer cooling system

A numerical study on effect of intra and inter spaced winding configuration on performance of oil forced transformer cooling system

Determining Accuracy of Temperature Limit Change in Power Transformer Core Using Temperature-Time Parameter Method

Natural esters as sustainable alternating dielectric liquids for transformer insulation system: analyzing the state of the art

Contact Info

Product

Resources

About