The Aging Characteristics of Laminated Pressboard and Laminated Wood in Oil Cooled Power Transformers

Gasser, H.P.; Krause, Christoph; Prevost, Tom

doi:10.1109/elinsl.2006.1665343

Cited by 3 publications

(2 citation statements)

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“…These cases cause the transformer to age faster and lead to unexpected failures [15][16][17]. Insulating materials such as mineral oil and cellulose-based kraft papers are the leading dielectric components in a transformer that are subjected to extreme stresses [18][19][20][21]. In general, high deterioration or deformation of these two components causes insulation failures in transformers [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Determination of transformer board creep parameters under high‐mechanical and thermal stresses

Arabul

Kumru

Arabul

2020

IET Science Measure & Tech

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During operation of a transformer, all components inside the transformer begin to age and lose their performances due to various stresses. Among these components, transformer boards (TB) used between windings have an important role in terms of equipment reliability for being used for both insulation and cooling purposes. TBs are exposed to all sorts of specified stresses during operation and their physical structure deteriorates by creeping over time. This deterioration leads to a decrease in the gap between winding turns, and insulation failures occur due to insufficient cooling. In order to prevent these types of failures, it is quite important to specify creep characteristics of TBs before the production particularly for high‐mechanical and thermal stresses. In this study, creep parameters (secondary creep rate, time to breakdown) of TB samples used in a typical power transformer under various loading and temperature are determined experimentally. In addition, gradient values are calculated for fitted lines and results obtained evaluated in terms of transformer operating conditions. Creep data obtained under high temperature (90, 100 and 110°C) and loading (30, 35 and 40 kg) makes an important contribution to literature and will help transformer manufacturers in design and production stages.

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Section: Introductionmentioning

confidence: 99%

Determination of transformer board creep parameters under high‐mechanical and thermal stresses

Arabul

Kumru

Arabul

2020

IET Science Measure & Tech

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“…Moreover, the mechanical properties of pressboard are highly moisture, temperature and ageing dependent[20,54,59,72,74,77,78]. Existing literature outlines that winding clamping pressure of a transformer is linked to moisture, temperature and ageing dependency of pressboard mechanical properties.…”

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confidence: 99%

Understanding the moisture temperature and ageing dependency of power transformer winding clamping pressure

Naranpanawe¹

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Progressive loss of winding clamping pressure is a failure mode that reduces the short circuit withstand capability of power transformers. Short circuit faults exert strong electromagnetic forces on the transformer winding structure, which could deform and displace its conductors. Failure to maintain the structural integrity of the winding structure during short circuit faults often leads to a catastrophic transformer failure, which could cause a disastrous network failure.

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Condition Monitoring of Power Transformers - Bibliography Survey

Singh

Sood

Jarial

2008

IEEE Electr. Insul. Mag.

104

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The Aging Characteristics of Laminated Pressboard and Laminated Wood in Oil Cooled Power Transformers

Cited by 3 publications

References 1 publication

Determination of transformer board creep parameters under high‐mechanical and thermal stresses

Determination of transformer board creep parameters under high‐mechanical and thermal stresses

Understanding the moisture temperature and ageing dependency of power transformer winding clamping pressure

Condition Monitoring of Power Transformers - Bibliography Survey

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