Development of a hot-spot temperature calculation method for the loss of life estimation of an ONAN distribution transformer

Arabul, Ahmet Yiğit; Şenol, İbrahim

doi:10.1007/s00202-017-0641-0

Cited by 32 publications

(27 citation statements)

References 18 publications

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“…Moderate Low Low Very cheap Detecting length/m 0-2000 None None None 1 Average parameters for common commercial products. 2 K-type thermocouple (most commonly used).…”

Section: Costmentioning

confidence: 99%

“…Thereafter, Gong built a temperature measurement system based on FBG (Fiber Bragg Grating) sensor for a 110 kV transformer [11]. Then, Arabul arranged a large quantity of fluorescent fiber sensors in the oil passages between each adjacent winding wire for the detection of overheated regions in a 1.5 MVA power transformer [1,12]. However, the direct measurement method often requires an estimation of the hot spot position in advance, which is highly subjective and empirical, and cannot achieve distributed measurement in the entire region.…”

Section: Introductionmentioning

confidence: 99%

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Global Temperature Sensing for an Operating Power Transformer Based on Raman Scattering

Liu

et al. 2020

Sensors

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Traditional monitoring methods cannot obtain the overall thermal information for power transformers. To solve this problem, a distributed fiber optic sensor (DFOS) was creatively applied inside an operating 35 kV power transformer by highly integrating with the electromagnetic wires. Then, the transformer prototype with totally global sensing capability was successfully developed and it was qualified for power grid application through the strict ex-factory tests. The as designed optical fiber sensor works stably all the time with a temperature accuracy of ±0.2 °C and spatial positioning accuracy of 0.8 m. Based on the obtained internal temperature distribution, Gaussian convolution was further applied for the signal processing and hereby, the hotspots for all the windings and iron cores could be accurately traced. The hottest points were located at 89.1% (55 °C) of the high voltage winding height and 89.7% (77.5 °C) of the low voltage winding height. The actual precise hotspot location corrected the traditional cognition on the transformer windings and it would serve as an essential reference for the manufactures. This new nondestructive internal sensing and condition monitoring method also exhibits a promising future for the DFOS applying in the high-voltage electrical apparatus industry.

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“…Moderate Low Low Very cheap Detecting length/m 0-2000 None None None 1 Average parameters for common commercial products. 2 K-type thermocouple (most commonly used).…”

Section: Costmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Global Temperature Sensing for an Operating Power Transformer Based on Raman Scattering

Liu

et al. 2020

Sensors

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“…Şekil 3'te verilen 5 bacaklı nüve yapısında denklemlerde belirtilen 0 , , 0 , değerlerinin karşılıkları gösterilmiştir. [7], [13].…”

Section: Denklem 5 Ile Birlikte Belirlenenunclassified

“…Denklem 9 ve Denklem 10 kullanılarak yapılan oranlama işleminde elde edilen sonuçlar, Denklem 11'de yerine konulduğunda; 5 bacaklı nüve yapısının oluşması için temel 3 bacaklı nüveye eklenecek bacakların boyutlandırılması yapılmış olmaktadır. Belirlenen ölçülerde eklemeler yapıldığında, oluşturulması planlanan nüve yapısı ortaya çıkmış olacaktır[7]. belirtilen tüm hesaplamalar yapıldığında, 3 ve 5 bacaklı nüve yapısına sahip şönt reaktörlerin boyutlandırılması tamamlanmış olacaktır.…”

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Modelling of the equally distributed air gapped shunt reactor

Arabul¹,

Kurt²,

Arabul³

et al. 2020

Pamukkale J Eng Sci

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Elektrik enerjisi günümüzde vazgeçilmez bir yere sahiptir. Elektrik enerjisinin üretildiği tesislerden kullanım alanlarına kadar ulaşmasını sağlayan ise iletim ve dağıtım hatlarıdır. Ancak, uzun iletim hatlarındaki reaktif güç dengesinin sağlanamaması sonucunda iletilen enerji hem kalitesiz olur hem de taşıma sırasında oluşan kayıplar artar. Bu olumsuz durumların yaşanmaması için iletim hatlarının tamamlayıcı bir parçası olarak geliştirilen şönt reaktörler kullanılmalıdır. Şönt reaktörlerin bu işlevi en iyi şekilde yerine getirebilmesi için tasarım aşaması önemli bir yere sahiptir. Reaktör boyutu, hava aralığının toplam uzunluğu, bırakılan hava aralığı sayısı gibi önemli parametreler reaktörün endüktans değerini doğrudan etkilemektedir. Reaktörün endüktans değeri ise iletim hatlarındaki reaktif güç dengesini sağlamak adına yapılacak olan kompanzasyon işleminin sonucunu doğrudan etkileyen bir faktördür. Bu çalışmada; hava aralıkları eşit dağıtılmış farklı hava aralık sayılarına sahip üç ve beş bacaklı nüve yapılı şönt reaktör tasarımı yapılmıştır. Tasarımlara ait benzetim çalışmaları, yüksek doğruluğa ve kararlılığa sahip Sonlu Elemanlar Yöntemi kullanılarak yapılmıştır. Benzetim çalışmalarının sonuçları ile ekonomik analizlerin karşılaştırmalı değerlendirmesi yapılmıştır.Today, electrical energy has an indispensable place. The transmission and distribution lines deliver electrical energy from power plants to usage areas. However, as the reactive power balance in the long transmission lines cannot be achieved, the transmitted energy is both has poor quality and increases the transportation losses. Shunt reactors developed as an integral part of the transmission lines should be used to avoid these adverse events. Shunt reactors have an important place in the design phase in order to perform this function in the best way. Important parameters such as the reactor size, the total length of the air gap, the number of air gaps, directly affect the reactor's inductance value. The inductance value of the reactor is a factor that directly affects the result of the compensation process to ensure the reactive power balance in the transmission lines. In this study; three-legged and fivelegged core shunt reactor designs are done with different air gap numbers and equally distributed air gapped. Simulation studies of the designs are done by using Finite Element Method with high accuracy and stability. A comparative evaluation of the results of simulation studies and economic analyzes are done.Anahtar kelimeler: İletim hatları kayıpları, Uzun iletim hatları kompanzasyonu, Şönt reaktör, Şönt reaktör modellenmesi, Sonlu elemanlar yöntemi.

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“…There is worldwide concern about core losses which should ideally be reduced [2]. In electrical transformers, losses are an important factor in thermal designs and electromagnetic analyses [3], [4]. In recent decades there has been great and rapid change in the manufacture of electrical transformers [5]- [10].…”

Section: Introductionmentioning

confidence: 99%

A Novel Method to Enhance the Core Design of Power Transformers Using Particle Swarm Optimization (PSO) Technique

Alyozbaky

Kadir

Izadi

2019

International Journal of Simulation: Systems, Science &Amp; Technology

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The reduction of losses in a power transformer is a significant topic in a power transmission grids, with the design of the core being one of the important factors related to the losses. In this study, an intelligent algorithm is developed using Particle Swarm Optimization (PSO) technique to find the optimum core design. Using a smart algorithm we consider a novel method to reduce the losses. To achieve this target, a nonlinear B-H curve with a 3D Finite-Element Method (FEM) is used to simulate the proposed model of core coupling with the PSO technique. Steady state analysis is considered in the simulation and the losses of the core and windings were considered a heat source inside the transformer. The results show core losses are reduced by 11 % and 5 % was achieved by the proposed model compared with the 90° butt-lap and 45° mitred designs respectively. The results were validated against the manufacturer's experimental measurements. Our proposed optimization techniques can be used to improve performance of electrical power transformers and can be applied to various transformers of different sizes and power rating.

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Development of a hot-spot temperature calculation method for the loss of life estimation of an ONAN distribution transformer

Cited by 32 publications

References 18 publications

Global Temperature Sensing for an Operating Power Transformer Based on Raman Scattering

Global Temperature Sensing for an Operating Power Transformer Based on Raman Scattering

Modelling of the equally distributed air gapped shunt reactor

A Novel Method to Enhance the Core Design of Power Transformers Using Particle Swarm Optimization (PSO) Technique

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