Dynamic thermal model of kiosk oil immersed transformers based on the thermal buoyancy driven air flow

Radaković, Zoran; Jevtić, Milica; Das, Bhaba Priyo

doi:10.1016/j.ijepes.2017.04.003

Cited by 21 publications

(14 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Es importante acotar que en trabajos similares desarrollados anteriormente, también se han utilizado metodologías experimentales de este tipo para la validación de modelos térmicos, tal es el caso de los transformadores de distribución encapsulados con ventilación natural (Radakovic, 2017). En la Tabla 3 se pueden observar los datos de entrada utilizados para la estimación de temperatura en los modelos.…”

Section: Evaluación Y Clasificación Según Su Precisión Y Criterio De unclassified

Evaluación de Modelos Térmicos usados para Estimar la Temperatura del Punto Caliente en Transformadores de Distribución

2019

View full text Add to dashboard Cite

ResumenEste artículo presenta una evaluación de los principales modelos térmicos de transformadores considerando el número de datos de entrada requeridos y la confiabilidad de los datos de salida de cada modelo. Además, se presenta un breve análisis del comportamiento térmico del transformador basado en la temperatura del punto caliente. Luego, se describe una validación experimental de los modelos térmicos realizada en dos transformadores de distribución inmersos en aceite vegetal, simulando un perfil de carga en periodos de tiempo específicos. Finalmente, los resultados experimentales son comparados con datos resultantes de la implementación de los modelos en un software de análisis numérico con el fin de establecer las diferencias paramétricas y la precisión de cada modelo, permitiendo concluir que el desempeño más óptimo corresponde al modelo de ecuaciones diferenciales de la Comisión Electrotécnica Internacional.. Palabras clave: modelos térmicos; perfil de carga; temperatura de punto caliente; transformadores inmersos en aceite; evaluación.Abstract This paper presents an evaluation of the main transformers thermal models considering the number of input data required and the output data reliability of each model. Also, a brief analysis of transformer thermal behaviour based on the hot-spot temperature is shown. Then, an experimental validation of the thermal models performed in two oil-immersed distribution transformers is described, simulating a load profile in specific periods of time. Finally, the experimental results are compared with data resulting from the implementation of the models in numerical analysis software in order to establish the parametric differences and precision of each model showing that the most optimal performance corresponds to the model of differential equations of the International Electrotechnical Commission.

show abstract

Section: Evaluación Y Clasificación Según Su Precisión Y Criterio De unclassified

Evaluación de Modelos Térmicos usados para Estimar la Temperatura del Punto Caliente en Transformadores de Distribución

2019

View full text Add to dashboard Cite

show abstract

“…Also, there is an approximation in the model for heat transfer along the radiators, which is important for the air buoyancy in the zone of the radiators. The basics about the buoyancy can be found in our previous publications [5] and [14]. Several improvements of the lumped model from [5] have been made in the meantime and will be published as an upgraded model for calculation of air buoyancy, based on the radiator modeled as a heat exchanger.…”

Section: Assumptions In the Modelmentioning

confidence: 99%

“…The basics about the buoyancy can be found in our previous publications [5] and [14]. Several improvements of the lumped model from [5] have been made in the meantime and will be published as an upgraded model for calculation of air buoyancy, based on the radiator modeled as a heat exchanger. In FEM CFD, fins are initially modeled as the rectangular aluminum bars.…”

Section: Assumptions In the Modelmentioning

confidence: 99%

“…That model was based on the empirical data. In our recent publication [5] we published more physical factor based model. As far as we know, no other research efforts similar to those presented in [5] have been made by other authors.…”

Section: Introductionmentioning

confidence: 99%

“…In our recent publication [5] we published more physical factor based model. As far as we know, no other research efforts similar to those presented in [5] have been made by other authors. Meanwhile, we improved the lumped model announced in [5] and will publish such an upgraded model, with additional on-site tests, in a future paper.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fem CFD analysis of air flow in kiosk substation with the oil immersed distribution transformer

Stanišić

Jevtić

Das³

et al. 2018

FACTA U EE

Self Cite

View full text Add to dashboard Cite

In practice of loading of oil-immersed distribution transformers, there is a need to have lumped thermal model, requiring no big computational resources and computational time. One such model is presented in international transformer loading guide (IEC 60076-7), where heat transfer inside the transformer is modeled. In case of indoor transformer operation, this model does not consider transient thermal phenomena in the room. We developed a lumped model that includes heat transfer in the transformer room. In scope of the research, we also built FEM CFD (finite element method, computational fluid dynamics) model of air flow and heat transfer. The purpose of FEM CFD was to make a better insight into air flow, i.e. to study the simplifications introduced in lumped model and suggest potential improvements. This paper presents results achieved with FEM CFD. The considered case was the transformer with natural oil and natural air flow (ONAN).

show abstract

Temperature effect on the thermal properties of insulation paper

et al. 2020

View full text Add to dashboard Cite

Dynamic thermal model of kiosk oil immersed transformers based on the thermal buoyancy driven air flow

Cited by 21 publications

References 5 publications

Evaluación de Modelos Térmicos usados para Estimar la Temperatura del Punto Caliente en Transformadores de Distribución

Evaluación de Modelos Térmicos usados para Estimar la Temperatura del Punto Caliente en Transformadores de Distribución

Fem CFD analysis of air flow in kiosk substation with the oil immersed distribution transformer

Temperature effect on the thermal properties of insulation paper

Contact Info

Product

Resources

About