Proceedings ArticleDOI
Thermal aging properties of pressboard in mineral oil and natural ester
Jinhui Zhou,Jian Li,Ruijin Liao,Yandong Lv +3 more
- pp 1-4
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TLDR
In this article, the authors compared the thermal aging properties between natural ester and mineral oil-pressboard insulation system, and found that the value of moisture content and dielectric loss in natural esters were higher than that of mineral oil, but it had a better insulation strength and service life.Abstract:
This article aims to contrastively study the thermal aging characters under different temperature between natural ester and mineral oil-pressboard insulation system. The thermal aging experiment was conducted with copper flat bars together in a sealed stainless vessel at 130 °C for 80 days, and at 100 °C for 220 days separately. Some basic physicochemical and electric characteristics of oil and cellulose varied with aging time, including moisture content, acid value, viscosity, furfural content, dielectric loss, AC breakdown voltage of oil, and the degree of polymerization were tested at each scheduled aging time. Results showed that the value of moisture content and dielectric loss in natural ester were higher than that of mineral oil, but it had a better insulation strength and service life.read more
Citations
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Journal ArticleDOI
Evaluation of unfilled and nanofilled oil/paper insulation system under thermal aging
TL;DR: In this paper , the effect of thermal aging on the breakdown voltage of oil/kraft paper insulation as well as transformer oil is carried out considering epoxy coated and non-coated pressboards.
Journal ArticleDOI
Thermal stability of a vegetable oil-based thermal fluid at high temperature
TL;DR: Synthetic and mineral oils are widely used in high temperature processes (above 200°C) as heat transfer fluids or thermal storage materials as discussed by the authors, and they are essentially derived from petroleum that...
Journal ArticleDOI
Monofractal and Multifractal Analysis of Discharge Signals in Transformer Pressboards
TL;DR: Pressboards are commonly used as insulating materials employed in electrical connections of transformers as mentioned in this paper.They are typically made from vegetable fibers, which contain cellulose, and are used as an insulating material for transformers.
Proceedings ArticleDOI
Raman Diagnosis Method for Thermal Aging of Insulating Paper Based on AE-LDA and Naive Bayes
TL;DR: In this paper, the authors used an autoencoder and a linear discriminant analysis algorithm to extract the characteristics of the Raman spectrum, and used a Naive Bayes classification method to divide the aging stage of the insulating paper.
Proceedings ArticleDOI
Comparison of Mineral Oil Behavior with and Without the Presence of Catalysts During Accelerated Thermal Aging
P. Hahn,Radek Polansky +1 more
TL;DR: In this paper, an impact of the presence of catalysts on the properties of mineral transformer oil during accelerated thermal aging was investigated, where the oil was thermally aged both in the catalytic and in the non-catalytic environments.
References
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Journal ArticleDOI
Vegetable oils for liquid-filled transformers
TL;DR: In this paper, the development of vegetable oils for transformer use, their biodegradability, decomposition products, functional life test, fire hazard tests and the special challenges presented by cold weather are discussed.
Proceedings ArticleDOI
Interaction mechanisms of natural ester dielectric fluid and Kraft paper
TL;DR: In this article, the interactions of natural ester fluid and cellulose insulation resulting in increased paper life are described by two interrelated chemical reaction mechanisms, and the change in cellulose structure is verified using infrared analysis.
Journal ArticleDOI
A survey of aging characteristics of cellulose insulation in natural ester and mineral oil
TL;DR: In this paper, a case for allowing higher temperatures in transformers filled with natural ester fluids was made and the authors provided a review of data from aging studies performed on cellulose (both Kraft paper and pressboard) impregnated separately in mineral oil and BIOTEMP (ABB, USA), a high oleic sunflower based fluid.
Journal ArticleDOI
Practical life-assessment technique for aged transformer insulation
TL;DR: In this paper, a practical life-assessment technique is presented that has been recently developed within a major Australian utility and applied to over 40 service-aged transformers, where several inputs are used to determine this quantity, including the degree of polymerisation of paper samples taken from in situ units.
Journal ArticleDOI
Seed-oil-based coolants for transformers
TL;DR: In this paper, the safety, reliability, and environmental performance of natural ester transformer fluids are discussed and compared side by side with conventional mineral oil fluid, and two refinery case studies are presented.