Journal ArticleDOI
Analysis of a fractured 500 kV composite insulator - identification of aging mechanisms and their causes
TLDR
In this paper, a fractured 500 kV ac composite insulator, whose fracture characteristics differ significantly from those of brittle fracture, is analyzed in order to identify the aging mechanisms involved and their causes.Abstract:Â
In this paper, a fractured 500 kV ac composite insulator, whose fracture characteristics differ significantly from those of brittle fracture, is analyzed in order to identify the aging mechanisms involved and their causes. Several sheath punctures occurred along the insulator which apparently originated from inside the insulator. Removal of the sheath revealed weak adhesion as well as tracking along the sheath-core interface. Weak microscopic as well as macroscopic interfaces were indicated by the insulator's weak performance in the water diffusion and dye penetration test according to IEC 62217. The core material was analyzed by means of FTIR identifying glass corrosion, ion exchange and hydrolysis as major degradation mechanisms. Based on the results of analysis, a water induced aging process is proposed and recommendations for online monitoring of composite insulators with respect to interfacial aging are given.read more
Citations
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Failure analysis of decay-like fracture of composite insulator
TL;DR: In this article, the decay-like fracture of composite insulator was treated and studied as a new type of composite-insulator mechanical failure, and the main features of decaylike fracture were summarized.
Journal ArticleDOI
Decay-like fracture mechanism of silicone rubber composite insulator
TL;DR: In this article, a decay-like fracture of composite insulator was investigated and microscopic physic-chemical properties of fracture-like fractured fiber reinforced plastic (FRP) core rod were analyzed using Scanning Electron Microscope (SEM), TGA and Fourier Transform Infrared (FTIR) Spectroscopy methods.
Journal ArticleDOI
Ultrasonic phased array detection of internal defects in composite insulators
TL;DR: In this paper, a nondestructive ultrasonic phased array (UPA) technique is used to test composite insulators. But, the UPA inspection system is not suitable for the inspection of complex components characterized by complex geometry.
Journal ArticleDOI
Research of nondestructive methods to test defects hidden within composite insulators based on THz time-domain spectroscopy technology
TL;DR: In this article, a novel far-field nondestructive testing (NDT) for defects within composite insulators based on the terahertz time-domain spectroscopy (THz-TDS) technology was introduced.
Journal ArticleDOI
Effect of electrical stress on glass fiber reinforced polymer used in high voltage composite insulator under wet environment
TL;DR: In this paper, the effect of electrical stress on glass fiber reinforced polymer under wet condition has been investigated, and the degradation process of GFRP rod was divided into four consecutive stages, namely degradation inception stage, hydrolysis stage, carbonization stage and breakdown stage.
References
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Outdoor HV composite polymeric insulators
TL;DR: In this paper, the authors present a review of the recent performance experience of HV composite polymeric insulators in outdoor service, testing methods, aging, the ranking of the materials, the role of fillers, low molecular weight components present in the insulators, mechanisms responsible for the loss and recovery of hydrophobicity, one of the most important properties of polymers, the mechanisms of failure, detection of faults, type and quantity of natural contaminants, effects of exposure to rain, hydrocarbons, stationary air and wind, various methods to optimize the electrical performance and a
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Tracking and erosion of HTV silicone rubber and suppression mechanism of ATH
Seiji Kumagai,Noboru Yoshimura +1 more
TL;DR: In this paper, the tracking and erosion resistance of high temperature vulcanizing (HTV)-silicone rubber (SIR) and the suppression mechanism of alumina trihydrate (ATH) filler were investigated.
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Diagnostic Methods for Outdoor Polymeric Insulators
TL;DR: In this article, a review on recognized composite insulator faults and methods for their detection is provided, as well as diagnostic methods and tools for determining the quality of composite insulators.
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Review of aging and recovery of silicone rubber insulation for outdoor use
TL;DR: In this article, a survey of the properties of silicone rubber for outdoor insulation is presented and the methods of assessing these properties are discussed and this is followed by a detailed survey of what is known of aging recovery mechanisms.
Journal ArticleDOI
Effects of hygrothermal aging on epoxy-based anisotropic conductive film
TL;DR: In this paper, the effects of aging on the adhesion strengths were measured by shear mode tests and the changes of molecular conformation were analyzed by Fourier Transform Infrared Spectroscopy (FTIR).