Wyniki wyszukiwania - BazTech

Ograniczanie wyników

4 Computer Applications in Electrical Engineering

Powiadomienia systemowe

Sesja wygasła!
Sesja wygasła!

Znaleziono wyników: 4

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: high voltage power transformers

Sortuj według:

Ogranicz wyniki do:

Mathematical modeling the temperature field of power transformer

Gościński P., Dombek G., Nadolny Z., Bródka B.

Computer Applications in Electrical Engineering

2016

Vol. 14

138--147

High voltage transformer is one of the most important elements of the power system. Due to this reason, it is crucial to properly design and build from mechanical side as well as thermal side. Nowadays, designers of power transformers are using from the many programs that allow you to reduce design time. Additionally, thanks to them, designer can quickly and effectively bring new changes in the construction and see what will be their impact on the work of the transformer. This paper shows design assumptions of the mathematical model of power transformer, the similitude theory which was used to maintain an appropriate scale, and interface of Ansys CFX program, in which simulations of temperature field of power transformer was made.

Thermal properties of nanoliquids prepared on the basis of natural ester modified by nanoparticles TiO2 and C60

Dombek G.

Computer Applications in Electrical Engineering

2015

Vol. 13

404--413

In this paper the results of the researches concerning thermal properties of insulting nanoliquids received on the basis of natural ester, titan dioxide TiO2 and fullerene C60 were presented. Thermal conductivity, viscosity, density and specific heat are these thermal properties. The range of the temperature was changing from 25°C to 80°C. These properties are crucial from the viewpoint of heat transfer coefficient by insulating liquid used in insulating system of power equipment; thus, they influence on temperature distribution inside the equipment. The possibility of receiving steady nanoliquids was also analyzed. The impact of natural ester modification by nanoparticles and surfactant on thermal properties of received nanoliquids was proved.

Analysis of heat transfer coefficient of synthetic and natural ester in the aspect of their application in power transformer

Gościński P., Dombek G., Nadolny Z., Bródka B.

Computer Applications in Electrical Engineering

2015

Vol. 13

376--385

Insulating liquids due to their properties are used in electrical power transformers, capacitors, connectors and high voltage power cables. One of the most important tasks for electrical insulating liquids is a heat transport out of the device. The heat transfer in the liquids depends on heat transfer coefficient. The heat transfer coefficient depends on a viscosity, thermal conductivity coefficient and thermal expansion coefficient. This paper shows results of calculations for heat transfer coefficient of insulating liquids used as insulation in electrical equipment, depending on the kind of liquid and temperature. Synthetic ester oil and natural ester oil were analyzed. The range of the temperature was changing from 25°C to 80°C.

Thermal properties of nanoliquids in the aspects of their used in the insulation system of high voltage power transformer

Dombek G., Nadolny Z., Przybyłek P

Computer Applications in Electrical Engineering

2014

Vol. 12

217--226

The article presents information concerning the electrical and thermal properties of nanoliquids in the context of their use in the insulating system of high voltage power transformers. It consists of six chapters. The first chapter is an introduction. The second chapter describes properties of the modern insulating nanoliquids created on the basis of mineral oil and nanoparticles. The third chapter is devoted to the measurement systems to the measure of the viscosity, thermal conductivity and density. The fourth chapter presents the methods of preparation of nanoliquids. In the fifth chapter the viscosity, thermal conductivity and density of mineral oil and nanoliquids were compared. Article ends with a summary.