Thermal modeling of disc-type winding for ventilated dry-type transformers

Lee, Moon-Hee; Abdullah, Hussein A.; Jofriet, J. C.; Patel, Dhiru

doi:10.1016/j.epsr.2009.08.007

Cited by 19 publications

(7 citation statements)

References 7 publications

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“…Sargılardaki yük kayıpları, iletkenlerin direnci ile verilen DC kayıplarına ve kaçak akının yoğunluğuna bağlı girdap akımı kayıplarına ayrılabilir [4,5].…”

Section: Sargilardaki̇ Kayiplarin Hesaplanmasiunclassified

“…Transformatörün verimli ömrü, ulaşma süresi tasarım ömrü ve belirli bir zamanda arıza olasılığı gibi bazı ilgili güvenilirlik parametrelerinin tahminleri de sunulmuştur [4]. Transformatörün farklı noktalarındaki sıcaklığı ve sıcaklık dağılımını tahmin etmek için analitik yöntemler, genelleştirilmiş ısı iletimi modelini kullanan kapalı form matematiksel tekniğe dayalı olarak sunulmuştur [5]. Bununla birlikte, sıcak nokta sıcaklığını harmonik koşullar altında değerlendirmenin birkaç yöntemi vardır.…”

Section: Introductionunclassified

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Sonlu Elemanlar Yöntemi ile Dağıtım Transformatörlerinin Harmonik Yük Kayıplarının Analizi

Özüpak

2021

Mühendislik Bilimleri Ve Araştırmaları Dergisi

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Estimating losses in transformers is important for both manufacturers and users. With the development of technology, harmonics in power systems are increasing. Transformers, which are an important component of the power system, also carry harmonic load currents. It is important to be able to accurately calculate the load losses in order to predict the hot spot temperatures and total losses during operation. Different methods have been developed in this regard. Among these methods, Finite Element Method is well known and its accuracy has been proven in engineering studies. Transformer designers have specific programs developed and used for design and analysis. In this study, ANSYS@Maxwell software and simulation program is used to design a parametric model of a power transformer. In this way, the load losses of the transformer in both normal operating conditions and harmonic operating conditions were obtained. In addition, the effect of harmonic loads on magnetic flux distribution has been investigated.

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“…Sargılardaki yük kayıpları, iletkenlerin direnci ile verilen DC kayıplarına ve kaçak akının yoğunluğuna bağlı girdap akımı kayıplarına ayrılabilir [4,5].…”

Section: Sargilardaki̇ Kayiplarin Hesaplanmasiunclassified

Section: Introductionunclassified

Sonlu Elemanlar Yöntemi ile Dağıtım Transformatörlerinin Harmonik Yük Kayıplarının Analizi

Özüpak

2021

Mühendislik Bilimleri Ve Araştırmaları Dergisi

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“…The accuracy of different models of numerical methods has been investigated in order to calculate transformer's no-load losses. Unloaded losses are calculated using analytical method and Finite Element Analysis software [7,[13][14][15][16]. In their article study using the Ansoft Maxwell analysis program, the flux density and core losses were analyzed for the transformer using 7 different Tconnection forms (same core material.…”

Section: Introductionmentioning

confidence: 99%

Analysis of electronic circuit transformer with experimental and finite elements

Özüpak

Teke

Mamiş

2021

International Journal of Energy Applications and Technologies

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Transformers, one of the most important elements of energy transmission and distribution systems, can be produced as a result of high cost and long-term studies. It is necessary to know the mechanical, electrical and magnetic properties of a transformer in the manufacturing process. Modeling of the transformers to be designed with a reliable simulation program in order to operate at targeted values and efficiency is important in terms of ensuring test criteria and minimizing the problems that may arise later. Thanks to advanced computer techniques, it is possible to identify design errors and correct them through a simulation program. In this paper, ANSYS Maxwell 3D software based on Finite Element Method (FEM) and widely used in transformer simulation was used. With this program, it is aimed to investigate the magnetic field density, magnetic field intensity, magnetic flux lines, current density values in the coil and core of the transformer and the effects of these values on transformer losses. Considering the nominal values of the single phase 90 VA transformer, its electrical and physical values were measured by experimental studies in the laboratory environment, and the necessary parameters and values were calculated based on these measurements. The theoretically calculated values are compared with the experimental study results and the values calculated with ANSYS Maxwell program. It was observed that the experimental study results and the results of the model created in the program confirmed each other.

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“…For instance, IEEE Std C57.159 TM -2016 [7] suggests considering the rate of the PV-transformer based on the load profile. In [13,11] the numerical methods Finite Element Analysis (FEA) and Computational Fluid Dynamics (CFD) were used to model the temperature distribution in dry-type transformers. In [4], overloads in dry-type transformers were assessed running multiple CFD simulations in order to obtain relations between the hottestspot, time, and load; each simulation lasted 3 h. Therefore, CFD is not suitable for real-time thermal monitoring and assessment, because it demands a lot of computational resources and processing time.…”

Section: Introductionmentioning

confidence: 99%

Load capability estimation of dry-type transformers used in PV-systems by employing field measurements

et al. 2020

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Transformer insulation aging is a critical issue for both reliable and economic operations, and for planning of electrical systems. As insulation aging depends on the hottest-spot temperature, transformer management can be improved with a suitable model for temperature estimation and prediction. However, the temperature inside transformers varies dynamically because of changes in both the cooling conditions and the load cycles. Hence, this paper presents an algorithm to estimate and predict the hottest-spot in Dry-Type distribution transformers, so that their capability and insulation life can be assessed. This procedure is focused on transformers used to directly connect PV-inverters to the grid in order to consider the uncontrolled power generation of distribution PV-systems. To implement the algorithm, it is assumed that records of ambient temperature, PV-system power generation cycle, and winding temperature are available. With this data, the parameters of an equivalent thermal circuit are fitted in order to dynamically model the transformer hottest-spot. The method was validated using twelve-day records of a 70 kW p PV-generation system connected to a 75 kVA Dry-Type transformer. Results show that an enhancement in the hot-spot estimation is reached, and an assessment of the performance in real-time monitoring of the transformer capacity is achieved employing the proposed algorithm.

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Thermal modeling of disc-type winding for ventilated dry-type transformers

Cited by 19 publications

References 7 publications

Sonlu Elemanlar Yöntemi ile Dağıtım Transformatörlerinin Harmonik Yük Kayıplarının Analizi

Sonlu Elemanlar Yöntemi ile Dağıtım Transformatörlerinin Harmonik Yük Kayıplarının Analizi

Analysis of electronic circuit transformer with experimental and finite elements

Load capability estimation of dry-type transformers used in PV-systems by employing field measurements

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