The Influence of Absorbed Moisture on Partial Discharge Patterns Measured During Tree Growth in an Epoxy Resin

Alghamdi, A. S.; Dodd, S.J.

doi:10.1109/icsd.2007.4290890

Cited by 8 publications

(3 citation statements)

References 11 publications

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“…In terms of electrical performance, when the interface between the fiber and matrix is poor, interface defects will occur. Under the action of high electric intensity, partial discharge will induce the growth of electric or water branches [47][48][49]. Meanwhile, the improvement of the interface bonding degree can inhibit the polarization of the resin long chain and reduce the polarization loss, and thus reduce the leakage current.…”

Section: Characteristics Of Bf Interfacementioning

confidence: 99%

A Review on Basalt Fiber Composites and Their Applications in Clean Energy Sector and Power Grids

Liu

et al. 2022

Polymers

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Basalt fiber (BF) has a high mechanical strength, excellent temperature resistance, good chemical stability, low energy consumption, and an environmentally friendly production process. In addition, BF-reinforced polymers (BFRPs) have good corrosion resistance and designability; thus, they meet the application requirements of electrical equipment, such as new conductors, insulating pull rods, and composite cross-arms. However, there are still a series of technical issues in the mass production of BF, and the stability of the products needs to be further improved. Therefore, the research on the production, modification, and application of BF is necessary. This paper discusses the chemical composition and production technology of BF, describes the morphology and properties of BF, summarizes the interface problems and modification methods of composites, and finally, introduces the application prospects of BF in the field of electrical materials, which is expected to provide a reference for the application and promotion of BFRP in the future.

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Section: Characteristics Of Bf Interfacementioning

confidence: 99%

A Review on Basalt Fiber Composites and Their Applications in Clean Energy Sector and Power Grids

Liu

et al. 2022

Polymers

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“…It is not an inert material. It is denatured by water, which produces moisture and initiates teeing [11,12]; the polymerized chains which have been produced during the curing sequence can be broken or naturally split by time and temperature. This is a natural aging.…”

Section: The Design Of High Voltage Insulation Systems and The Main Rmentioning

confidence: 99%

The Insulation for Machines Having a High Lifespan Expectancy, Design, Tests and Acceptance Criteria Issues

Barré¹,

Napame²

2017

Machines

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Abstract:The windings insulation of electrical machines will remain a topic that is updated frequently. The criteria severity requested by the electrical machine applications increases continuously. Manufacturers and designers are always confronted with new requirements or new criteria with enhanced performances. The most problematic requirements that will be investigated here are the extremely long lifespan coupled to critical operating conditions (overload, supply grid instabilities, and critical operating environments). Increasing lifespan does not have a considerable benefit because the purchasing price of usual machines has to be compared to the purchasing price and maintenance price of long lifespan machines. A machine having a 40-year lifespan will cost more than twice the usual price of a 20-year lifetime machine. Systems which need a long lifetime are systems which are crucial for a country, and those for which outage costs are exorbitant. Nuclear power stations are such systems. It is certain that the used technologies have evolved since the first nuclear power plant, but they cannot evolve as quickly as in other sectors of activities. No-one wants to use an immature technology in such power plants. Even if the electrical machines have exceeded 100 years of age, their improvements are linked to a patient and continuous work. Nowadays, the windings insulation systems have a well-established structure, especially high voltage windings. Unfortunately, a high life span is not only linked to this result. Several manufacturers' improvements induced by many years of experiment have led to the writing of standards that help the customers and the manufacturers to regularly enhance the insulation specifications or qualifications. Hence, in this publication, the authors will give a step by step exhaustive review of one insulation layout and will take time to give a detailed report on the standards that are linked to insulation systems. No standard can provide insurance about lifespan, nor do any insulation tests incorporate all of the operating conditions: thermal, mechanical, moisture and chemical. Even if one manufacturer uses the standards compliance to demonstrate the quality of its realization; in the end, the successful use in operation remains an objective test. Thereafter, both customer and manufacturers will use the standards while knowing that such documents cannot fully satisfy their wishes. In one 20-year historical review, the authors will highlight the duration in insulation improvements and small breakthroughs in standards writing. High lifespan machines are not the main interest of standards. A large part of this publication is dedicated to the improvements of the insulation wall to achieve the lifespan. Even if the choice of raw materials is fundamental, the understanding of ageing phenomena also leads to improvements.

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“…Creeping discharge insulation board will form a "white spot", its essence is the discharge energy of oil gas inside the insulation board caused by decomposition and escape the cardboard, which belongs to a kind of insulation defects of recoverable. [1][2][3][4][5][6] "White spot" is creeping discharge electric breakdown of precursors, the direction and speed of growth is directly related to the remaining life of insulation board. This paper studied the growth of the "white spot" characteristics based on the different experimental conditions .…”

Section: Introductionmentioning

confidence: 99%

Analysis and Aesearch of White Spot on Creepage Discharge in oil-Pressboard Interface

et al. 2017

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Abstract. Creepage discharges on oil impregnated pressboard is one of the most dangerous transformer insulation fault, which can cause the gas action even transformer housing cracking accident. "White spot" is creepage important phenomena in the process of insulation board along the surface, so it is necessary to study the insulation board along the surface of creepage "white spot" in the process of growth characteristics. This paper set up a insulating paper along the surface of creepage "white spot" in the process of growth characteristics of observation platform. Numerical example was calculated under different aging degree creepage cardboard along the surface of the "white spot" in the process of change, statistics and analysis of the "white spot" length, angle and size variation, which is very practical to the production practice.

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The Influence of Absorbed Moisture on Partial Discharge Patterns Measured During Tree Growth in an Epoxy Resin

Cited by 8 publications

References 11 publications

A Review on Basalt Fiber Composites and Their Applications in Clean Energy Sector and Power Grids

A Review on Basalt Fiber Composites and Their Applications in Clean Energy Sector and Power Grids

The Insulation for Machines Having a High Lifespan Expectancy, Design, Tests and Acceptance Criteria Issues

Analysis and Aesearch of White Spot on Creepage Discharge in oil-Pressboard Interface

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