Condition assessment of porcelain and toughened glass insulators from residual strength tests

Mishra, Ashutosh; Gorur, R.S.; Venkataraman, S.; Kingsbury, D.

doi:10.1109/ceidp.2006.311957

Cited by 11 publications

(3 citation statements)

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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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“…The failure probability is highly dependent on the mechanical and electrical characteristics of insulators, as mechanical and electrical properties are responsible for the strength of the insulator. It has been reported in many articles that the composition constituents of the porcelain body has a large impact on the mechanical and electrical characteristics of insulators [4][5][6][7]. This article focused on studying the relation between the failure probability of insulators and the weight percentage of porcelain contents, such as SiO 2 , Al 2 O 3 , and Fe 2 O 3 , for the lifetime assessment of a porcelain insulator.…”

Section: Introductionmentioning

confidence: 99%

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

Sanyal

Kim

et al. 2020

Applied Sciences

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The aging of porcelain insulators is responsible for the failure of power utilities. Porcelain insulators from different places in South Korea, possessing various aging times and years of installation, have been investigated to carry out lifetime statistics. These samples have a mass of 36,000 lbs and are operated at 154 kV. X-ray fluorescence (XRF) and scanning electron microscopy (SEM) were performed on the porcelain bodies of the samples collected. XRF and SEM revealed trends in the weight percentage of SiO2, Al2O3, and Fe2O3 in the porcelain bodies of the collected samples. The SiO2 and Fe2O3 weight percentage reduced to 8.93% and 73.17%, respectively, in sample C compared to A. However, the Al2O3 weight percentage increased to 16.23% in sample C compared to sample A. This change in weight percentage of SiO2, Fe2O3, and Al2O3 contributed toward enhancing the mechanical and electrical properties of the insulators. Mechanical load tests with electrical voltage (M&E), thermal and mechanical load tests (T&M), and hardness tests (HRB) were performed to evaluate these characteristics. Experiments revealed an increase of 90.9% in the inequality factor (K) in sample C compared to A. The impact of constituents of porcelain on the lifetime expectancy of a porcelain insulator was reported by implementing statistical strategies, such as the Weibull distribution.

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Insulators

Schmuck¹,

Papailiou²

2016

CIGRE Green Books

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Condition assessment of porcelain and toughened glass insulators from residual strength tests

Cited by 11 publications

References 1 publication

Replacement Strategy of Insulators Established by Probability of Failure

Replacement Strategy of Insulators Established by Probability of Failure

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

Insulators

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