Residual mechanical strength evaluation of crimping assembled composite insulators with service time of 10–14 years

Xiong, Xiao; Wang, Jianguo; Yao, Tianyu; Chen, Lincong; Li, Cai; Fan, Yadong

doi:10.1049/iet-gtd.2018.5344

Cited by 7 publications

(4 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The twisted strip design features a roller assembly (Figure 14) with individual strips made of a blend of two materials and metal end fittings made of 1090 mild steel. The end fittings provide visual indicators once the wear threshold is crossed [10,[16][17][18]. A close-up view of the stresses at the ends of the insulating rods (mobius strips) at the boundaries of the twisted strip design is shown in Figure 14a [16][17][18].…”

Section: Results: Design Analysis and Discussionmentioning

confidence: 99%

“…The end fittings provide visual indicators once the wear threshold is crossed [10,[16][17][18]. A close-up view of the stresses at the ends of the insulating rods (mobius strips) at the boundaries of the twisted strip design is shown in Figure 14a [16][17][18]. The linear movement of the pantograph at 200 kmph with a 200 kgf load applied to the insulating rods is converted to a rotational movement of the insulator rod/strip, eliminating the need for manual rolling as in the conventional system.…”

Section: Results: Design Analysis and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Innovative Engineering Solutions for Short Neutral Section Maintenance Reduction in Railway Overhead Lines

Jain,

Upasani

2024

AEF

View full text Add to dashboard Cite

This work addresses the challenges associated with the development of short neutral sections (SNS) for overhead lines of high-speed moving trains. A crucial function of a short neutral section is to provide electrical isolation between the different phases of AC traction. These sections are typically located in proximity to the traction substation and sectioning posts. The current SNS design presents several issues, including pantograph arcing, wear and tear of the overhead line system, and the need for manual rotation during periodic maintenance. To address these challenges TRIZ is used, a problem-solving methodology that leverages inventive principles to generate innovative solutions. The work outlines the use of several TRIZ tools and techniques, including the Interaction Matrix, Functional Analysis, Function-Body Diagram (FBD), Trimming, and the Contradiction Matrix [1]. With the application of these tools, the author presents several potential solutions for improving the SNS design to eliminate periodic maintenance and services. One proposed solution involves the use of a segmented overhead line system with an insulating cylinder-shaped discrete insulator to ensure smooth contact of the pantograph. Another solution involves the use of a twisted strip-based insulator to replace linear motion with rotating movement, eliminating the need for manual rotation. The work emphasizes the importance of considering various factors, such as design, material, wear rate, maintenance, and creepage distance, when evaluating the feasibility of these solutions. By leveraging TRIZ to generate innovative solutions, the author demonstrates the potential of this methodology to drive innovation and overcome complex challenges in the development of short neutral sections for high-speed rails.

show abstract

Section: Results: Design Analysis and Discussionmentioning

confidence: 99%

Section: Results: Design Analysis and Discussionmentioning

confidence: 99%

Innovative Engineering Solutions for Short Neutral Section Maintenance Reduction in Railway Overhead Lines

Jain,

Upasani

2024

AEF

View full text Add to dashboard Cite

show abstract

“…Nevertheless, it should be corrected based on the statistical computations on the taken insulator from the sites. Moreover, sample data of silicone rubber insulators taken from sites were obtained, referring [19], [20], [49], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59], [60], [61], [62], [63], and [64], and analyzed by statistical boxplots, as shown in Fig. 14.…”

Section: G Comparative Leakage Currents In Time Durationmentioning

confidence: 99%

Influence of Mounting Incline and Natural Environmental Factors on Pin-Type Silicone Rubber Insulator Leakage Currents Using Internet-Based Monitoring

Waluyo,

Putra

2023

IEEE Access

View full text Add to dashboard Cite

High-voltage insulators are essential components in overhead transmission and distribution lines. Various environmental factors and probable mounting inclines may influence the performance of insulators. Therefore, it is necessary to continuously and simultaneously investigate these influences using an internet-based data-logging system. Here, the test samples were vertical, thirty-degree, sixty-degree, and horizontal mounting inclinations on 7.5 kV-subjected pin-type silicone rubber (SiR) insulators. The recorded data included 7,917 measurements acquired every five minutes for a month and then analyzed using statistical tools. At midday, the surrounding environmental temperature, illuminance, and ultraviolet (UV) radiation reached their peak values, whereas the humidity reached its lowest value. The air pollution concentration reached its highest levels in the morning, and rain rarely occurred. The insulator leakage currents reached their top values before dawn and their lowest values at midday. Originally, the typical highest leakage current was the vertical mounting insulator, which reached 1.36 up to 2.36 times that of the remaining insulators; the maximum and maximum typical values were 24.27 µA and 4.9 µA, respectively. Increasing illuminance, UV radiation, and temperature influenced the leakage currents to decrease, but the corresponding leakage currents rose as the humidity, air pollution concentration, and rainfall increased. Based on extrapolations of the data, the vertical mounting insulator is the most vulnerable installation for severe air pollution concentrations, reaching a predicted warning condition of 287.2 µg/m 3 . However, the horizontal mounting insulator is the least suitable for rainfall above 16.86 mm. The typical shortest forecasted warning condition is 10.3 years on the thirty-degree mounting insulator.INDEX TERMS Environmental factor, inclination, insulator, leakage current, silicone rubber (SiR).

show abstract

“…First, the above studies are only aimed at the high and low ambient humidity, which do not reflect change process and rules of various parameters in different stages during the transition process from low humidity to high humidity; in addition, some studies also lack quantitative analysis. Secondly, the above studies generally analyse the surface current and volume current of samples, while the deterioration usually develops from the rod-sheath interfaces to the surface and interior of the rods [14][15][16][17]; so it is necessary to study the change of electrical quantity at the rod-sheath interfaces of decay-like composite insulators. Thirdly, all the above studies are based on the short samples taken from the decay-like composite insulators.…”

Section: Introductionmentioning

confidence: 99%

Study on the influence mechanism of ambient humidity on the temperature rise of decay‐like composite insulators

et al. 2021

View full text Add to dashboard Cite

At present, observing the temperature rise of composite insulators is an effective method for the detection of decay‐like defects. However, ambient humidity will affect the temperature rise of composite insulators, which will cause problems in screening the decay‐like composite insulators. Therefore, it is urgent to study the temperature rise principle of decay‐like insulators and find out the influence mechanism of humidity on temperature rise. In this study, a four‐electrode system is designed to measure the surface current, volume current and interface current of the decay‐like short sample and the intact short sample under different humidity. Then the equivalent circuit models of short samples and the 500 kV full‐size decay‐like composite insulator are built to analyse the contribution rates of leakage conductance loss and polarisation loss to temperature rise. The results show that the contribution rates of the polarisation loss to the temperature rise of two samples are 35.8% and 23.6% in low humidity, while they are 98.3% and 64.4% in high humidity. For the full‐size decay‐like composite insulator, the contribution rates of polarisation loss to its temperature rise in high or low humidity are more than 99%. In addition, the proportion of polarisation loss increases at first and then decreases with the increase of the length of the decay‐like section. The conclusions of this study provide a theoretical basis for further understanding the corresponding relationship between decay‐like defects and temperature rise and improve the detection rate of decay‐like insulators.

show abstract

Residual mechanical strength evaluation of crimping assembled composite insulators with service time of 10–14 years

Cited by 7 publications

References 17 publications

Innovative Engineering Solutions for Short Neutral Section Maintenance Reduction in Railway Overhead Lines

Innovative Engineering Solutions for Short Neutral Section Maintenance Reduction in Railway Overhead Lines

Influence of Mounting Incline and Natural Environmental Factors on Pin-Type Silicone Rubber Insulator Leakage Currents Using Internet-Based Monitoring

Study on the influence mechanism of ambient humidity on the temperature rise of decay‐like composite insulators

Contact Info

Product

Resources

About