Analysis of wind-induced response of down lead transmission line-connection fitting systems in ultrahigh-voltage substations

Zhang, Meng; Shang, Ruhao; Lu, Zhongbin; Zhang, Xizhuo; Xie, Kai; Zhang, Bo

doi:10.1016/j.engstruct.2019.110144

Cited by 5 publications

(5 citation statements)

References 26 publications

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“…The model in this paper is closer to actual engineering applications. Compared with the literature, [23] shows that HVB-LA-DLTL systems and substation boxes have a large impact on the overall system stiffness. Thus, the overall stiffness of the system decreases, the natural frequencies of vibration become lower, and the dynamic effect of the system under dynamic load is greater, which is consistent with the characteristics of the lead structure system in the actual substation.…”

Section: Modementioning

confidence: 79%

“…Because the high-voltage casing lead structure system studied in this paper is complex, there is a lack of reliable test results to verify the correctness of the model; thus, results from the literature [19] are chosen as the basis for validating this work. For an accurate comparison with the existing loading method, the same loading method is chosen to compare the stress values at the same location and the results are shown in Table 2.…”

Section: Verification Of the Fe Modelingmentioning

confidence: 99%

“…According to the modal analysis results above, the natural frequencies of vibration of the HVB-LA-DLTL systems in this paper are lower than those in the literature. The model in the literature [19] contains only the upper span line, lead wire, and connection gold specific system. Given that the upper span line and lead wire are considered fixed ends, the overall stiffness of the system is high.…”

Section: Modementioning

confidence: 99%

“…Previously, relevant research was conducted on a high-voltage casing system under wind loads on the basis of the actual engineering of a 1000 kV UHV substation in Central China. This article continues to use the same engineering background from the literature [19], selects El Centro waves, Taft waves, and artificial standard timehistory waves from the PEER database, applies X, Z one-way and three-way input. The acceleration response, displacement response, and stress response of the key parts of the high-voltage casing system under the action of three different peaks of 0.07, 0.2, and 0.4 g, are used to determine the safety factor and compare the safety factor with the seismic design code for power facilities GB50260 required in 2013.…”

Section: Introductionmentioning

confidence: 99%

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Seismic Response Analysis of High-Voltage Bushings and Down Lead Transmission Line Systems in Substations

Zhang

Wei

et al. 2022

Applied Sciences

Self Cite

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Based on an actual ultra-high voltage (UHV) substation, a finite element (FE) model for a high-voltage (HV) bushing, arrester, and down lead transmission line (DLTL) system was built using ANSYS software. The dynamic responses of the system under different seismic intensities were analyzed and compared with those of the corresponding single bushing and arrester. On this basis, the coupling vibration influence of the upper DLTL on the responses of the HV bushing and arrester is discussed. The results indicate that the DLTL adversely affects the responses of the HV bushing and arrester under seismic loading. As the seismic intensity increases, the structural displacements at the top of the HV bushing and arrester increase, accompanied by a reduction in the geometric length redundancy of the DLTL, resulting in a mutual pulling effect between the HV bushing and the arrester and the quick amplification of their respective dynamic responses in a nonlinear form. Under the action of an earthquake with a peak ground acceleration (PGA) of 0.4 g, the maximum stresses at the roots of the HV bushing and the arrester in the system separately increase by approximately 13.02% and 7.80% compared to the corresponding single HV bushing and the arrester. Overall, a geometric length redundancy of at least 200 mm in the DLTL in engineering design is recommended.

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Section: Modementioning

confidence: 79%

Section: Verification Of the Fe Modelingmentioning

confidence: 99%

Section: Modementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seismic Response Analysis of High-Voltage Bushings and Down Lead Transmission Line Systems in Substations

Zhang

Wei

et al. 2022

Applied Sciences

Self Cite

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“…The stress evolution in the connecting structure is an important cause of the above accident phenomenon. Several accidents, including a line trip, occurred in a 1000 KV UHV substation transformer in Central China [9], a burst accident occurred in a 500 KV substation in Anhui Province [10], and a heating failure in a 800 KV converter station was reported in Zhejiang Province, China, related to the seal failure induced via the connection loosening [11]. The reason was attributed to bolt looseness induced via the complex load among the connecting structure components, based on the subsequent investigation.…”

Section: Introductionmentioning

confidence: 99%

Effects of Bias Voltage and Target Current on Microstructure and Load Measurement Performance of ZnO Piezoelectric Coatings Applied to Bolt in Transformer

Kou,

Wang,

Nie

et al. 2023

Coatings

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Electrical accidents caused by bolt looseness in transformers have been frequently reported in recent years. The monitoring, and warning of, axial force as an indicator of looseness is one of the key issues affecting the operation and maintenance of transformers. Traditional ultrasonic testing and a patch-type ultrasonic method, using piezoelectric probes and coupling agents, showed poor repeatability and accuracy in detecting the bolt pre-tightening force, because of the uncertainty of the contact interface produced via manual operation. A permanent thin-film pressure sensor (PMTS), which provides accurate and in-situ stress detection, is more suitable for bolts, to reveal the pretightening force. The key is depositing a nano-zinc oxide (ZnO) piezoelectric film with an excellent measurement performance, which could be tuned using deposition parameters. This paper investigates the effects of the current and bias voltage on the crystal structure and performance of ZnO piezoelectric films. The results show that the crystallinity degree and resistance decrease with the increase in bias voltage, while the target current could increase the crystallinity. However, a high current also brings large particles in the coating surface, which greatly decrease the resistance. The cause is expected to be related to the ion energy, which could be affected by the bias voltage and current. The PMTS deposited with an optimized bias voltage and current revealed excellent measurement performance, and is expected to be applied to the bolt, to detect the pretightening force.

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Algorithm and framework for tower fault caused by ice overload

Velásquez

Lara

2021

Engineering Failure Analysis

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Analysis of wind-induced response of down lead transmission line-connection fitting systems in ultrahigh-voltage substations

Cited by 5 publications

References 26 publications

Seismic Response Analysis of High-Voltage Bushings and Down Lead Transmission Line Systems in Substations

Seismic Response Analysis of High-Voltage Bushings and Down Lead Transmission Line Systems in Substations

Effects of Bias Voltage and Target Current on Microstructure and Load Measurement Performance of ZnO Piezoelectric Coatings Applied to Bolt in Transformer

Algorithm and framework for tower fault caused by ice overload

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