Frequency-domain transmission characteristics of electromagnetic wave signals excited by partial discharge in GIS

2012 ◽  
Author(s):  
Miao Peiqing ◽  
Li Xiuwei ◽  
Ye Haifeng ◽  
Sheng Gehao ◽  
Jiang Xiuchen
Keyword(s):  
Electromagnetic Wave ◽  
Frequency Domain ◽  
Partial Discharge ◽  
Transmission Characteristics

Simulation Study of Partial Discharge UHF Wave Transmission Characteristic in GIS Typical Structure

2014 ◽  
Vol 672-674 ◽  
pp. 787-792
Author(s):  
Jing Gang Yang ◽  
Yong Yong Jia ◽  
Ke Zhao ◽  
Shan Gao
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetic Waves ◽  
Single Phase ◽  
Partial Discharge ◽  
Simulation Models ◽  
Propagation Characteristic ◽  
Transmission Characteristics ◽  
Typical Structure ◽  
The Waves ◽  
Difference Time

Defects inside the gas-insulated switchgear (GIS) will produce ultra-high frequency (UHF) electromagnetic waves. The waves will be affected by the shell of GIS when propagating inside the GIS cavity. In the 0-3GHz frequency range, propagation characteristic of electromagnetic which is excited by partial discharge in GIS is simulated based on the method of finite difference time domain (FDTD). This paper designs the GIS simulation models with and without insulator according to the size of a 220kV single phase GIS bus and sets a metal protrusion defect on the bus as the PD source. The transmission characteristics of model waves inside typical GIS structures, and the influence of the insulator to the propagation of electromagnetic wave was studied via setting the different directions of electromagnetic, comparing the time and frequency domain results of electromagnetic wave in different structures and measurement angles.

Development of a Portable XLPE Cable Insulation Detection Device

2014 ◽  
Vol 960-961 ◽  
pp. 881-884
Author(s):  
Xiao Guang Xi ◽  
Yu Yan Man ◽  
Chi Zhang ◽  
Ming Lei Wu ◽  
Yan Wei Dong ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Electromagnetic Wave ◽  
Electromagnetic Coupling ◽  
Partial Discharge ◽  
Power Cables ◽  
Cable Insulation ◽  
Xlpe Cable ◽  
Insulation Status

In this article, a portable XLPE cable insulation detection device is introduced. Such a device utilizes electromagnetic coupling, UHF electromagnetic wave and acoustic emission to detect partial discharge signals in power cables. By analyzing the partial discharge signals and cable temperatures, the insulation status of XLPE power cables is judged.

Current Detection Methods of Partial Discharge for Distribution Network Switchgear

2014 ◽  
Vol 521 ◽  
pp. 313-316
Author(s):  
Yu Sheng Quan ◽  
Lin Jie Fang ◽  
Yan Wu ◽  
Zi Jian Wang
Keyword(s):  
Electromagnetic Wave ◽  
High Frequency ◽  
Partial Discharge ◽  
Outer Wall ◽  
Detection Methods ◽  
Total Current ◽  
Current Signal ◽  
Current Detection ◽  
Ground Line ◽  
Frequency Current

There are many factors that can lead to partial discharge in the internal of switchgear. High-frequency current will be generated on the inner wall of switchgear when the electromagnetic wave generated by partial discharge reaches the enclosure of switchgear. In the same way, more complex current signal will be produced on the outer wall of the switchgear because of the electromagnetic radiation outside the enclosure. These two currents will flow to earth through the switchgear ground wire. We can determine whether the switchgear exist partial discharge and the severity of the partial discharge by comparing the current flowing through the outer wall and the total current flowing through the ground line.

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