Article
Engineering, Electrical & Electronic
Jianliang Sun, Yuyao Hu, Xingliang Jiang, Ying Wu, Tianyang Li, Yunpeng Zhao, Yong Rong
Summary: This study investigates the flashover performance of snow-coated insulators through laboratory and field tests. The characteristics and variations of the insulators under different conditions were analyzed and compared. The results show that the uneven distribution of snow, color changes in the arc, and the development of flashover path are influenced by the type of insulator and the degree of snowing.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Zhu Meilin, Jiang Xingliang, Liu Yanqing
Summary: In this study, the volt-ampere characteristics of direct current long arc on the ice-surface were measured using ice column in a multi-functional artificial climate chamber. The results showed that arc length had an effect on the volt-ampere characteristic constant A, exponent n and expression. Additionally, the dynamic volt-ampere characteristics and static volt-ampere characteristics were redefined and studied, providing a foundation for flashover voltage prediction of long iced insulator strings. This research has important theoretical guiding significance for the external insulation design of ultra-high voltage direct current transmission lines in icing areas.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Chunyu Zong, Yuyao Hu, Xingliang Jiang, Richang Xian, Zongyuan Liu, Jianliang Sun
Summary: Ice accretion on insulators can reduce the creepage distance and lead to flashover trip. There are significant differences between laboratory simulation and field tests, impacting the behavior of ice-covered insulators. Icicle growth on energized insulators varies under weak and high electric field conditions.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2022)
Article
Computer Science, Information Systems
Lizheng Chen, Xiaohan Shi, Bo Peng, Jingwen Sun
Summary: Excessive carbon emissions leading to global climate deterioration pose a severe threat to the stable operation of power systems. Hybrid simulations have been used to uncover the influence mechanism and dynamic interaction process between extreme weather conditions and power systems, with models constructed to establish the relationship between meteorological conditions and grid failure.
Article
Materials Science, Composites
Zimin Luo, Yushun Zhao, Jinhui Bai, Kerong Yang, Yufan Xu, Lijian Ding, Bin Du
Summary: This study presents a new approach to enhance the surface-insulating performance of epoxy composites by constructing peak-type charge barriers using nanodiamonds (NDs). The constructed barriers alter the charge migration behavior and improve the charge dissipation rate, surface flashover voltage, and arc resistance duration of the ND/epoxy composite.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Ali Ahmed Salem, Rahisham Abd Rahman, Salem Al-Ameri
Summary: This study introduces an analytical model for contaminated insulators under critical conditions, improving the mathematical model based on equivalent electrical circuit approach and discharge propagation criterion. Laboratory tests were conducted to measure flashover voltage, determine dynamic arc parameters, and extract electric arc constant values using genetic algorithm technique. Critical parameters such as current, length, and resistance of discharge were measured and calculated, with statistical analysis applied to validate the proposed models' reliability. Comparisons with experimental results and previous research show the expected performance of insulators under various operating conditions according to IEC 5070 Standard.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Physical
Yi Xie, Wei Xiong, Shefiu Kareem, Chuxiong Qiu, Yongfei Hu, Ivan P. Parkin, Shengwu Wang, Huayun Wang, Junwu Chen, Lee Li, Zhi Chen, Huajun Sun, Xiujian Zhao
Summary: Researchers have developed a novel anti-flashover technique by creating a superamphiphobic coating with a unique hierarchical structure, which improves the flashover performance of insulators. The coating exhibits excellent abrasion resistance, UV resistance, and chemical and thermal stability, and significantly improves the pollution flashover voltage of insulators.
Article
Engineering, Environmental
Shuming Liu, Shuqi Liu, Qian Wang, Zhou Zuo, Lan Wei, Zhong Chen, Xidong Liang
Summary: This article introduces a multifunctional nano-coating based on SiO2/PDMS/EP for improving the surface performance of insulators. The coating exhibits excellent water-repellency, self-cleaning performance, and anti-icing ability, while also allowing for fast surface charge dissipation and increased wet flashover voltage.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Mechanical
Lin Liu, Yao Zheng, Yanpeng Hao, Qiaogen Zhang, Xiaoang Li, Lingcheng Chen, Licheng Li
Summary: Basin insulator is a crucial component in SF6 gas insulated switchgear, and its fault can lead to equipment failure. This study analyzes surface flashover patterns under impulse voltage, categorizing them into three types based on initiation points. The findings provide insights for diagnosing and preventing surface flashovers in GIS equipment.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Faiq Arkan Dewanto, Adityadika Miftakhul Khakim, Tumiran, Mochammad Wahyudi, Noor Akhmad Setiawan, Dharma Saputra
Summary: This paper presents an approach to assess the condition of cup-and-pin insulators in a string by analyzing the ultraviolet (UV) emission during partial discharge. The UV patterns observed in laboratory tests were used to establish criteria for string condition levels, which were then applied to field installations. A regression classification model was built based on the comparison between the index value representing the field string condition level and the UV quantitative parameter extracted from the UV video. The proposed approach provided a predictive model with a mean absolute error of 0.182.
APPLIED SCIENCES-BASEL
(2022)
Article
Energy & Fuels
Chunhua Fang, Yuning Tao, Jianguo Wang, Haixin You, Yan Cui, Mi Zhou
Summary: The surface discharge development processes of polluted porcelain insulators for power transmission lines are closely related to the development of leakage current (LC), the characteristics of LC, insulating condition, and discharge intensity. The amplitude, harmonics, and phase difference of LC are important indicators for revealing contamination discharge state of insulators. High amplitude, low proportion of harmonics, and small phase difference between fundamental harmonic and voltage characterize LC before flashover occurrence.
FRONTIERS IN ENERGY RESEARCH
(2021)
Article
Physics, Applied
Junhong Chen, Jinshu Li, Junhao Dong, Peng Sun, Jianyi Xue, Junbo Deng, Guan-Jun Zhang
Summary: This article investigates the surface discharge and residual surface charge accumulation characteristics under a positive impulse. It quantitatively determines the residual charge distribution and establishes a model for the evolution process.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Tianyu Lin, Yongpeng Zhang, Zhijian Lu, Zhengwen Wang, Peng Wei, Chengying Liu, Lanjun Yang
Summary: This study conducted flashover experiments on various dielectric surfaces under RMPs and proposed an empirical formula for SIL prediction, with lambda as a more suitable parameter. It was found that the relationship between E/p and pt(delay) varies with PRF, and the SIL recovery capability decreases with an increase in PRF, exacerbating surface deterioration during successive flashovers.
Article
Engineering, Electrical & Electronic
Lijun Jin, Jianyong Ai, Shijia Han, Gangjie Zhou
Summary: This study aims to investigate the mechanism of discharging on insulator surfaces and design a calculation method for predicting pollution flashover probability, with validation experiments confirming the effectiveness of the proposed methods.
IEEE TRANSACTIONS ON POWER DELIVERY
(2021)
Review
Engineering, Environmental
Yongcan Zhu, Ruiwen Zhou, Ye Zhang, Xinsheng Dong, Xinbo Huang
Summary: The paper analyzes the main influencing factors of icing flashover on insulators and deeply studies the morphological characteristics of iced insulators, as well as compares monitoring methods. Results suggest that image monitoring technology has advantages in predicting icing flashover. Discussions on the current progress and technical difficulties of image recognition technology for icing flashover parameters are also presented.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2021)