A case study of rupture in overhead ground wire twined by armor rod

Deng, Honglei; Peng, Ruidong; Zhong, Manli; Yang, Rui; Liang, Yongchun; Guo, Deming; Liu, Gang

doi:10.1016/j.engfailanal.2021.105844

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…(d) Additionally, the proposed NPAP is promising for potential applications involving lightning rods [11]- [13], [46], surge arresters with parallel gaps [47], and other similar devices [48]- [51].…”

Section: Discussionmentioning

confidence: 99%

A Comparative Study of Power Frequency Arcs Influenced by Negative-Polarity Artificial Pulses

Luo

Wang

et al. 2022

IEEE Access

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In this paper, we propose a method to guide power frequency arcs (PFAs) and investigate the electric potential and temperature characteristics of PFAs when a negative-polarity artificial pulse (NPAP) is applied from an artificial pulse generator. Based on a two-dimensional finite-element geometrical simulation model, we acquire and analyze numerical simulation results for the electric-potential and temperature distributions in the presence and absence of NPAPs. The simulation results indicate that the NPAPs accelerate the air ionization and streamer breakdown processes, which physically affects the electric potential and temperature distributions. In addition, to determine how the NPAPs affect the PFA discharge process, we qualitatively compare the arc plasma-coupling simulation results, which suggest that the NPAPs either modify the path of the PFA or change the discharge characteristics. Moreover, we use a PFA generator to experimentally investigate the PFA voltage. These experiments enable direct observation of the PFA path produced by NPAP guides. Finally, the simulation and experimental results demonstrate that the NPAPs provide innovative, simple, and cost-effective improvements in the efficiency of arc-extinguishing devices. This technique is suitable for use with arc-extinguishing devices and has significant prospects for applications in other fields. INDEX TERMSArtificial pulse generator, electric potential, negative polarity artificial pulses, arc plasmacoupling simulation, power frequency arc.

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Section: Discussionmentioning

confidence: 99%

A Comparative Study of Power Frequency Arcs Influenced by Negative-Polarity Artificial Pulses

Luo

Wang

et al. 2022

IEEE Access

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“…Ground wire clamp and tension string faults occurred five times, while suspension string faults occurred 32 times. Therefore, it is necessary to improve the preformed helical fitting performance, but there have been fewer studies on the holding force of the preformed helical fitting, and the related theory has also been lacking [1][2]. The preformed helical fitting structure is similar to steel strand and overhead conductors for transmission lines; so, the related research on steel strand and overhead conductors for transmission lines has important reference value [3][4].…”

Section: Introductionmentioning

confidence: 99%

Holding Force Characteristics of Preformed Helical Fitting Based on Finite Element Method

Yaguang²,

Liu

et al. 2023

IEEE Access

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As an important part of transmission lines, preformed helical fitting plays an indispensable role in the safe and stable operation of electronic circuits. However, due to the poor service environment of transmission lines, preformed helical fitting can often slip, scatter, and detwist. This paper explores variations in the holding force of the preformed helical fitting under different geometric parameters. First, the geometric structure of preformed helical fitting is analyzed, and the secondary development is conducted using the ABAQUS finite element software. The script program is written in Python language to realize the parametric modeling. Based on the experimental results, the changing trend of the holding force is consistent, which confirms the correctness of the finite element model. In addition, the preformed helical fitting is studied under different values of molding aperture, pitch length, pitch number, and armor rod diameter, and changes in the holding force under different parameters are analyzed. The results show that the holding force of the preformed helical fitting increases with the decrease in the molding aperture and pitch length, and the molding aperture has a negative linear correlation with the overall holding force. The holding force increases linearly with the pitch number; so, reducing the pitch length can increase the holding force of preformed helical fitting. Moreover, the results indicate that the holding force increases with the armor rod diameter. The research results presented in this study have important guiding value for the design of performed helical fitting.

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“…Deng et al analyzed a rupture accident of overhead ground wire at the armor rod terminal. Based on a finite element model of the armor rod terminal, the current density distribution and temperature distribution were analyzed to further explain the overheating mechanism at the armor rod terminal [17] .…”

Section: Introductionmentioning

confidence: 99%

Design of Backup Protective Hardware for Suspension Clamp of Electric Power Overhead Ground Wire

Zheng

Yang

et al. 2022

J. Phys.: Conf. Ser.

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Aiming at the disconnection problem of power overhead ground wire caused by wind vibration or the action of power frequency short-circuit current, the newly revised “Eighteen major anti-accident measures of State Grid Corporation China” proposes that independent double string structure should be adopted in suspension clamp of overhead ground wire. Based on this, a research scheme of backup protective hardware for the suspension clamp of the overhead ground wire of the power transmission line is proposed. In this scheme, the backup protective hardware for the suspension clamp is designed and added on the premise that the original overhead ground wire-suspension clamp structure is not changed. It provides backup measures for the original suspension clamp and reduces suspension clamp heating by an electrical shunt. Finally, the mechanical failure load test and salt spray test are performed on the designed production. The results show that the designed production meets the standard and could be used in actual engineering. At the same time, the practical engineering application shows that the backup protective hardware can effectively reinforce the ground wire suspension clamp with double strings, avoiding the problem of dropping and breaking after the original clamp is broken.

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A case study of rupture in overhead ground wire twined by armor rod

Cited by 4 publications

References 19 publications

A Comparative Study of Power Frequency Arcs Influenced by Negative-Polarity Artificial Pulses

A Comparative Study of Power Frequency Arcs Influenced by Negative-Polarity Artificial Pulses

Holding Force Characteristics of Preformed Helical Fitting Based on Finite Element Method

Design of Backup Protective Hardware for Suspension Clamp of Electric Power Overhead Ground Wire

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