Transformer hot spot temperature assessment terminated at transmission line through a cable under lightning impulses

Taheri, Shamsodin; Shahabi, Saeed; Gholami, Ahmad

doi:10.1109/eurcon.2009.5167684

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…For this reason, accurate determination of the pre-design / pre-production characteristics of the components such as transformer oil and spacer that can be monitored instantaneously will enable the evaluation of the monitored parameters to be made more accurately. Electrical and chemical analysis of transformer oils can be performed with many devices/systems used today and even dielectric performances can be obtained instantaneously (Arabul et al, 2015; Josue et al, 2012; Taheri et al, 2009; Vanegas and Mahajan, 2008). However, it is quite hard to monitor the creep ratio of spacer between the windings due to the need for mechanical measurement and being in the interior regions of transformer.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on creep characteristic of the spacer between winding turns of power transformers

Arabul

Kumru

Arabul

et al. 2019

Transactions of the Institute of Measurement and Control

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The lifetime of insulation in a power transformer deteriorate in time by reason of high electrical/thermal stresses and contaminations from environmental factors. In particular, faults in oil type power transformers due to thermal stress ruin energy continuity and cause serious economic losses. Most of the faults due to thermal stress generally occur at the hot-spot location of transformer windings. Particularly, creeping of the spacer between windings and the resulting thermal stress constitutes a significant part of the transformer failures. Therefore, the determination of creep characteristics under different conditions is important in terms of fault estimation, aging calculations and product development. In this study, it is aimed to acquire creep characteristics and failure time of spacer for different test temperatures. For this reason, a test system is designed to determine the creep characteristics of the spacer between the windings. In order to specify temperature ranges of the tests to be done, thermal analysis is performed for different creep rates of the spacer. The test setup is designed according to the results of thermal analysis, and creep test results are presented. The results indicate that creep characteristics of spacers will provide to make the aging calculations and failure prediction algorithms more accurate.

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Section: Introductionmentioning

confidence: 99%