An assessment on aging model of IEEE/IEC standards for natural and mineral oil-immersed transformer

Biçen, Yunus; Çilliyüz, Yusuf; Aras, Faruk; Aydugan, Guzide

doi:10.1109/icdl.2011.6015442

Cited by 13 publications

(5 citation statements)

References 8 publications

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“…In the literature, it is commonly mentioned that vegetable-based oils prolong life of solid insulation between 5 to 8 times at the same temperature. For this purpose a factor (R) should be added to the calculation process of the aging model for natural ester [17]. In the model, firstly the hot-spot temperatures and secondly aging parameters such as insulation loss-life and remaining life can be calculated taking the ambient temperature and transient characteristics of the load into account for each natural ester/ mineral oil immersed power transformer as shown in Figure 1…”

Section: The Proposed Methods and Transient Modellingmentioning

confidence: 99%

Aging of Paper Insulation in Natural Ester & Mineral Oil

Biçen¹,

Çilliyüz²,

Aras³

et al. 2012

EEE

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This paper presents an assessment on aging model of IEEE and IEC standards using thermal model of oil-immersed power transformer for natural ester and mineral oil. For this purpose, a model created for the behaviour of transient thermal performance with aging of natural ester and mineral oils. Thermal model of the transformer is based on thermal-electrical analogy that is calculated separately for natural and mineral oils covering top-oil and hot-spot temperatures. The hot-spot temperature values of each ester/oil are used to calculate aging parameters which include the aging acceleration factor, time dependent relative aging rate and insulation life loss variations. In this study, mineral oil and natural ester are kept under temperatures which are 100℃ and 140℃ in different periods. Natural ester's characteristics are higher than mineral oil's, except its breakdown voltage. In addition, natural ester absorbs more water than mineral oil so it is understood that deformation of the insulating paper in natural ester is lower. Natural ester has important benefits to decelerate aging of insulation. There is a model which is proposed for natural ester oil-immersed transformers and there should be used an aging factor as R to predict remaining life.

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Section: The Proposed Methods and Transient Modellingmentioning

confidence: 99%

Aging of Paper Insulation in Natural Ester & Mineral Oil

Biçen¹,

Çilliyüz²,

Aras³

et al. 2012

EEE

Self Cite

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“…As a result, determining the degree of polymerization (DP) in order to define the state of an insulation paper is more convenient. When DP is decreased to 200 percent or 35 percent, the tensile strength is retained, but the paper quality (i.e., mechanical strength) is typically considered so bad that this marks the "end of life" for such an insulating substance, although the dielectric strength may be still at an acceptable level (Biçen et al, 2011). The submodel is shown in Figure 10.…”

Section: Remnant Life Of the Transformer Based On The Relative Aging ...mentioning

confidence: 99%

A novel method for life estimation of power transformers using fuzzy logic systems: An intelligent predictive maintenance approach

et al. 2022

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Power transformers are a fundamental component of the modern power distribution network. The fault-free operation of step-up and step-down transformers is of prime importance to the continuous supply of electrical energy to the consumers. To ensure such efficient operation, power distribution companies carry out routine maintenance of distribution transformers through preplanned schedules. The efficacy of such maintenance depends on a proper understanding of the transformer and its components and efficient prediction of faults in these components. There are several components whose condition can be studied to predict transformer failures and therefore the overall health of a transformer. These include transformer windings, insulations, transformer oil, core insulations, and ferromagnetic cores. This work develops a new, simplified fuzzy logic–based method to predict the health of a transformer by taking into account the state of several individual components. Case studies are used to demonstrate the efficacy of the developed method.

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“…Hence, it can be seen that many researches aimed focus to transformer's lifetime analysis and study. Researchers in [10] have proposed an assessment on aging model of IEEE/IEC standards for Oil-Immersed transformer by using thermal model to analyse the behaviour transient thermal performance while [11] has defined the smart meter functions required to accurately assess the aging of distribution transformer according to IEEE Std. C57.91 and C57.110.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Winding Temperature and Design of Distribution Transformer for Improving Short Circuit Withstand Capability under Renewable Generations Mixed Environment

Suechoey¹,

Boonseng²,

Chompoo-inwai³

2018

IJIES

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Under renewable generations mixed in today's modern grid system, many of renewable generation resources tend to increase the fault level to an existing power system. Rules and regulation for power equipment and devices need to be revised and updated, of course, no exception for the distribution transformers. This article, therefore, presents the evaluation and analysis of the winding temperature on both loading and short circuit conditions of an oil-immersed distribution transformer and propose the novel transformer design method for improving short circuit withstand capability. In the study, the methodologies of measuring and estimating the winding temperature of the transformer during short circuited are presented and implemented. In the study, various winding parameters are analysed including: the winding temperature, the hottest temperature of the winding after a short circuit, the short circuit current, short circuit force and short circuit duration. The tested and analysed result are benefit for the newly proposed distribution transformer design of a 400 kVA 3 phases 50 Hz 22 kV-400/230 V, Dyn11. The new design approaches will enable designers to find a weak spot and proper selection of raw materials, such as winding size, insulation thickness and properties of the silicon steel for a better quality of distribution transformer. Moreover, the new design can offer lower winding temperature rise of transformer while loading or experiencing with short circuit conditions meaning that it can prolong transformer insulation and extend transformer lifetime.

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An assessment on aging model of IEEE/IEC standards for natural and mineral oil-immersed transformer

Cited by 13 publications

References 8 publications

Aging of Paper Insulation in Natural Ester & Mineral Oil

Aging of Paper Insulation in Natural Ester & Mineral Oil

A novel method for life estimation of power transformers using fuzzy logic systems: An intelligent predictive maintenance approach

Analysis of Winding Temperature and Design of Distribution Transformer for Improving Short Circuit Withstand Capability under Renewable Generations Mixed Environment

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