Failure Trends of High-Voltage Porcelain Insulators Depending on the Constituents of the Porcelain

Sanyal, Simpy; Kim, Taeyong; Yi, Junsin; Koo, Ja-Bin; Son, Ju-Am; Choi, In Sil

doi:10.3390/app10020694

Cited by 14 publications

(6 citation statements)

References 16 publications

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“…Varieties of failure mode can be observed, such as separation of cap from body, separation of pin and shattering of porcelain body, as shown in Figure 3. The factors responsible for mechanical strength are porcelain body and the interface between cement, hardware and porcelain.The Korea Electric Power Research Institute (KEPRI) reported a reference factor known as quality factor (K), to evaluate the mechanical strength of porcelain insulators [23][24][25][26][27][28][29]. K, which evaluates porcelain insulators mechanically and electrically, was calculated by using Equation 1 for all age groups of samples, for the prevention of sudden The factors responsible for mechanical strength are porcelain body and the interface between cement, hardware and porcelain.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…K, which evaluates porcelain insulators mechanically and electrically, was calculated by using Equation 1 for all age groups of samples, for the prevention of sudden The factors responsible for mechanical strength are porcelain body and the interface between cement, hardware and porcelain. The Korea Electric Power Research Institute (KEPRI) reported a reference factor known as quality factor (K), to evaluate the mechanical strength of porcelain insulators [23][24][25][26][27][28][29]. K, which evaluates porcelain insulators mechanically and electrically, was calculated by using Equation ( 1) for all age groups of samples, for the prevention of sudden mechanical failure of insulators.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Replacement Strategy of Insulators Established by Probability of Failure

et al. 2020

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Insulators comprise only 5% of the capital cost of transmission lines; they are accountable for 70% of line interruptions and 50% of maintenance costs of transmission lines. Major transmission lines situated in different parts of the world were mostly all constructed 30 years ago. These lines have either completed or are approaching the active life at 30 years. It is not possible to replace all insulators at a time in any utility. From a standpoint of consistency, it is quite important to locate insulators that require replacement prior to the occurrence of failure. Recalling these issues, a replacement strategy was modeled on insulator samples, operated at 154 kV, mechanical and electrical rating (M+E) 25,000 lbs and within the 10–50 years (Y) age group, collected in bulk for laboratory evaluation, based on the probability of mechanical failure (P(F)) of insulators. For conducting these studies, tensile load test such as combined electrical and mechanical failing load test was performed on selected 30 new and aged porcelain insulator samples from bulk to access recent condition. It was observed that insulators under service for 50 years manifested a decrease of 89.3% in quality factor (K), as compared to insulators within 10 years of service. A micro-structural study was carried out by using an optical microscope (OM) and a scanning electron microscope (SEM) for the further confirmation of previous evaluations. P(F) was derived by implementing Weibull distribution on the experimental observations. It was observed that insulators with an age of 50 years depicted a 2.7% increase in P(F), as compared to insulators with an age of 10 years. This article discussed a strategy for accessing the recent condition of new, aged bulk samples and the criteria of the replacement of the insulator string based on P(F).

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Replacement Strategy of Insulators Established by Probability of Failure

et al. 2020

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“…Additionally, all the above reported approaches cannot be utilized for the active insulators onsite. The development of robust superhydrophobic surfaces for various industrial applications, including self-cleaning, anti-icing, antibacterial, oil–water separation, and corrosion resistance, has been reported several times. − This study aimed to improve stress corrosion resistance by developing a superhydrophobic surface utilizing a PFPE-infused functionalized SiO 2 nanocomposite with micro–nano structures as a multifunctional treatment on porcelain insulators. − …”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic Surface on Insulators by Using Perfluoropolyether-Functionalized Silica Nanostructures for Preventing Stress Corrosion Cracking at the Pin–Cement Junction

Sanyal

Kim

Dhungel

et al. 2023

ACS Appl. Nano Mater.

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Stress corrosion accounts for 52% of the recorded breakdown of insulators utilized in transmission lines which may interfere with the reliability of power utilities. The suggested etching-free treatment is a workable environmentally benign method to prevent stress corrosion, even in old insulators with more excellent surface imperfections or cracks. The resilient slippery coating is developed on an insulator surface to address the challenges by infusing perfluoropolyether, lubricating oil into a porous nano-silica surface. The proposed coating layer, thickness 35.4 μm, exhibits superhydrophobicity with contact angle�160°, contact angle hysteresis�4°, self-healing, corrosion resistance with a corrosion rate of 2 × 10 −3 mm/Y, I corr 2.01 × 10 −7 A/cm 2 , and 98% antibacterial adhesion performance against sulfate reducing bacterial stains. The outcome of this research is expected to pave the way for an approach to the future creation of incredibly robust etching-free coatings for insulators.

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“…The total amount of electro-technical insulator waste grows by massive tons every year. This occurrence provokes alarming environmental contamination (Suttibak and Nitivattananon, 2008;Xie et al, 2012;Cregut et al, 2013;Sanyal et al, 2020;Pereira et al, 2022). Therefore, the disposal of electro-technical porcelain insulators has become a critical issue in many nations (Brito and Saikia, 2013;Xu et al, 2015;Khan et al, 2016;Cicek et al, 2018;Tam et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Effect of binary raw materials replacement (quartz and feldspar) for porcelain chamotte on the electro-technical siliceous porcelain properties

Rodríguez,

Díaz-Tato,

López-Perales

et al. 2023

Front. Mater.

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The hurry for ecological practices and waste control has emerged as an obligation in modern times, demanding precise strategies to restrain waste accumulation and to stimulate recycling and reuse actions to lower the climate effect. The replacement of binary raw materials for porcelain chamotte waste in siliceous porcelain was studied to obtain eco-friendly high-voltage porcelain. Quartz and feldspar were progressively replaced by 5, 10, and 15 wt.% of porcelain chamotte in a conventional siliceous electro-technical porcelain composition. The replacement effect on sintered samples at 1250°C under industrial heat treatment was evaluated by measuring the linear shrinkage, bulk density, porosity, flexural strength, and microhardness technological properties. Phase analysis was carried out by X-ray diffraction. Microstructural characteristics were studied using a scanning electron microscope. The results showed that chamotte-containing samples reached bulk densities of about 2.36 g/cm3 and a porosity percentage near zero. The maximum flexural strength value at glazed states was 87.8 MPa, for 15 wt.% scrap-containing samples. X-ray diffraction studies revealed a higher mullite phase content in chamotte-containing samples. Scanning electronic microscopy images of the polished and etched specimens show the presence of quartz grains and secondary mullite needles embedded in a feldspathic vitreous matrix. The properties reached by the chamotte-containing samples are attractive since the values obtained in terms of flexural strength, density, and porosity are compared to those reported for conventional siliceous porcelain were obtained. The most noticeable result was observed in flexural resistance. The glazed porcelain bodies showed a flexural strength improvement of about 15%. Then, these porcelain compositions suggest an alternative to produce a more sustainable, affordable, and environmentally-friendly porcelain insulator product.

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Failure Trends of High-Voltage Porcelain Insulators Depending on the Constituents of the Porcelain

Cited by 14 publications

References 16 publications

Replacement Strategy of Insulators Established by Probability of Failure

Replacement Strategy of Insulators Established by Probability of Failure

Superhydrophobic Surface on Insulators by Using Perfluoropolyether-Functionalized Silica Nanostructures for Preventing Stress Corrosion Cracking at the Pin–Cement Junction

Effect of binary raw materials replacement (quartz and feldspar) for porcelain chamotte on the electro-technical siliceous porcelain properties

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