The Simulation Research on Propagation Characteristics of Acoustic Signal Generated By Buffer Layer Ablation Defects in High Voltage Cable

2021 ◽  
Author(s):  
Weisheng He ◽  
Zhaoguo Wu ◽  
Haitao Wu ◽  
Jiankang Bao ◽  
Xiaolong Zhou ◽  
...  
Keyword(s):  
Buffer Layer ◽  
High Voltage ◽  
Acoustic Signal ◽  
Propagation Characteristics ◽  
Simulation Research

Effects of connection conditions between insulation screen and Al sheath on the buffer layer failures of high-voltage XLPE cables

2021 ◽  
Vol 122 ◽  
pp. 105263
Author(s):  
Yun Chen ◽  
Baojun Hui ◽  
Yanting Cheng ◽  
Yanwen Chen ◽  
Yanpeng Hao ◽  
...  
Keyword(s):  
Buffer Layer ◽  
High Voltage

scholarly journals Analysis of Various ESDD of Contaminant Insulator Flashover Acoustic Signal by Wavelet Packet

2016 ◽  
Vol 16 (6) ◽  
pp. 220-231
Author(s):  
Hong Kun Wang ◽  
Shou Xiang Wang ◽  
Jing Nie
Keyword(s):  
High Voltage ◽  
Acoustic Signal ◽  
Wavelet Packet ◽  
Power Grid ◽  
Acoustic Signals ◽  
Salt Deposit ◽  
Power Network ◽  
Large Power ◽  
Insulator Flashover

Abstract With the formation of China’s large power grid, the security of the network is particularly important. The contaminant flashover of insulators has a serious impact on the operation safety of a high voltage power network. In this paper, the acoustic signals’ characteristics of the contaminant insulators flashover are analyzed, and, as a result, the correlation between the acoustic signal and the contaminant insulator flashover is established. To experiment with contaminant insulator for three different Equivalent Salt Deposit Densities (ESDD), acoustic signals were collected separately. Then, the contaminant insulators’ acoustic signals of flashover were analyzed by wavelet packet. The characteristics of the signals were obtained, and they can be judged for contaminant flashover warning.

scholarly journals Research on latent defect detection technology of high voltage cable

2021 ◽  
Vol 2113 (1) ◽  
pp. 012051
Author(s):  
Sanwei Liu ◽  
Chao Qiu ◽  
Yi Xie ◽  
Jianjia Duan ◽  
Fuyong Huang ◽  
...  
Keyword(s):  
Buffer Layer ◽  
High Voltage ◽  
Power Cables ◽  
X Ray ◽  
Depth Processing ◽  
Modern Development ◽  
Detection And Identification ◽  
Detection Technology ◽  
Intelligent Detection ◽  
The Internet Of Things

Abstract As a component of the Internet of things, high-voltage cables are the power supply infrastructure for the modern development of cities. The operation experience shows that the high-voltage cable has been broken down many times, due to the defective operation. At present, due to the limitation of detection technology, the research on detection and identification of defects in high-voltage cables is progressing slowly. Therefore, a new DR technology based on X-ray digital imaging is proposed in this paper to realize real-time detection of defects in the semi-conductive buffer layer of high-voltage cables, and intelligent detection of DR images of high-voltage cables by using image depth processing technology to realize intelligent identification of defects in the buffer layer of power cables. The results show that using the new DR technique proposed in this paper, the accurate and intuitive DR image of high-voltage cable can be obtained quickly, and the intelligent identification of defects can be realized.

scholarly journals Researches on very low frequency acoustic signal propagation characteristics in different shallow elastic wedge bottoms

2019 ◽  
Vol 283 ◽  
pp. 02003
Author(s):  
Jun Zhu ◽  
Hanhao Zhu ◽  
Jun Tang ◽  
Guangxue Zheng
Keyword(s):  
Acoustic Signal ◽  
Low Frequency ◽  
Signal Propagation ◽  
Acoustic Energy ◽  
Propagation Characteristics ◽  
The Finite Element Method ◽  
Very Low Frequency ◽  
Extremely Low Frequency ◽  
Elastic Bottom ◽  
Sloping Bottom

Targeted at the issue of extremely low-frequency (<100Hz) acoustic propagation in complex shallow elastic bottom environments. The influence law of different complex elastic bottoms on the acoustic signal propagation at very low frequency by acoustic energy flux has been analyzed with the simulation, which is based on the finite element method. The elastic bottoms which have been studied are the shallow horizontal elastic bottom, and the up-sloping and the down-sloping elastic bottom. The results show that the acoustic signal propagating in the up-sloping and down-sloping elastic bottom environments is more complex than that propagating in the horizontal elastic bottom, and the acoustic energy leaking into those elastic bottoms has very different influence on the acoustic signal propagation, especially in the up-sloping bottom.

The Simulation Research of Partial Discharge Electromagnetic Wave Propagation Characteristics in GIS

2013 ◽  
Vol 860-863 ◽  
pp. 2127-2130 ◽  
Author(s):  
Shan Jun Zhao ◽  
Dong Shen Xu ◽  
Zhao Li ◽  
Lu Li ◽  
Yi Wang ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Electromagnetic Wave Propagation ◽  
Partial Discharge ◽  
Electromagnetic Signal ◽  
Propagation Characteristics ◽  
Electromagnetic Propagation ◽  
Accurate Analysis ◽  
Simulation Research ◽  
Insulation Breakdown

GIS is the most important equipment in power grid. Partial discharge is the main cause leading to insulation breakdown. UHF detection is an effective method for PD detection in GIS. It is significant to obtain the electromagnetic propagation characteristics for the accurate analysis of detection results. The FDTD algorithm is present in this paper to study the electromagnetic signal in GIS. The amplitude and frequency characteristics are studied in this paper.

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