scholarly journals A Rectangular Planar Spiral Antenna for GIS Partial Discharge Detection

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaoxing Zhang ◽  
Yefei Han ◽  
Wei Li ◽  
Xuetao Duan
Keyword(s):  
Electromagnetic Interference ◽  
Electromagnetic Waves ◽  
Partial Discharge ◽  
Low Frequency ◽  
Horn Antenna ◽  
Spiral Antenna ◽  
Cavity Structure ◽  
Measurement Results ◽  
Defect Simulation ◽  
Tem Horn

A rectangular planar spiral antenna sensor was designed for detecting the partial discharge in gas insulation substations (GIS). It can expediently receive electromagnetic waves leaked from basin-type insulators and can effectively suppress low frequency electromagnetic interference from the surrounding environment. Certain effective techniques such as rectangular spiral structure, bow-tie loading, and back cavity structure optimization during the antenna design process can miniaturize antenna size and optimize voltage standing wave ratio (VSWR) characteristics. Model calculation and experimental data measured in the laboratory show that the antenna possesses a good radiating performance and a multiband property when working in the ultrahigh frequency (UHF) band. A comparative study between characteristics of the designed antenna and the existing quasi-TEM horn antenna was made. Based on the GIS defect simulation equipment in the laboratory, partial discharge signals were detected by the designed antenna, the available quasi-TEM horn antenna, and the microstrip patch antenna, and the measurement results were compared.

scholarly journals A Novel UWB TEM Horn Antenna with a Microstrip-Type Feed

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Youcheng Wang ◽  
Guangyou Fang ◽  
Hai Su ◽  
Yicai Ji ◽  
Shengbo Ye ◽  
...  
Keyword(s):  
Communication Systems ◽  
Return Loss ◽  
Low Frequency ◽  
Horn Antenna ◽  
Ultra Wideband ◽  
Buried Objects ◽  
Type Transition ◽  
Compact Size ◽  
Feeding Structure ◽  
Tem Horn

A novel ultra-wideband (UWB) TEM horn antenna fed by a microstrip-type transition is designed. The feeding structure is directly realized by a microstrip line with the merit of compact size and UWB. To broaden the low frequency band, an arc surface is added at the end of the flare plates. Numerical simulation is applied to discuss the effect of the geometry construction which contains the microstrip-type transition and the circular arc surface at the end of radiating arm. Return loss, radiation pattern, and gain of the fabricated antennas are measured. The measured results show that the antenna yields a wide bandwidth ranging from 1 GHZ to 10.3 GHz with return loss less than −10 dB. The antenna also achieves unidirectional radiation patterns with stable antenna gain. These characteristics imply that the compact antenna may be used for detecting buried objects in the wall or UWB communication systems of band like GSM, Wi-Fi, and so forth.

scholarly journals Spiral Antenna Design and Analysis As a Tool to Measure Partial Discharge in High Voltage Equipment

2021 ◽  
Vol 328 ◽  
pp. 02006
Author(s):  
Deni Tri Laksono ◽  
Dedi Tri Laksono ◽  
Miftachul Ulum
Keyword(s):  
High Voltage ◽  
Return Loss ◽  
Partial Discharge ◽  
Electrical Equipment ◽  
Antenna Design ◽  
Spiral Antenna ◽  
Literature Study ◽  
Measurement Results

The high-voltage equipment often experiences disturbances caused by the age of the equipment, installation errors, partial discharge disturbances. Of these kinds of disturbances, partial discharge is one of the most common disturbances in high-voltage equipment which has a percentage level of 80% due to partial disturbance. In this study, a research related to electrical equipment that can detect partial discharge disturbances in these high-voltage equipment was done. The equipment is a spiral antenna, where the spiral antenna has several advantages in detecting partial discharge. In making the first partial discharge, a literature study will be carried out first, after that designing a spiral antenna using CST 2018 software to get the Return loss and VSWR parameters as desired, namely Return Loss less than -10 and VSWR less than 2. From the results of this study Spiral antenna is measured using VNA, the measurement results show the spiral antenna is in accordance with the parameters that have been determined, namely the return loss value = -30.8 and the VSWR value = between 1 to 1.5.

scholarly journals Antipodal Vivaldi Antenna to Detect UHF Signals That Leaked Out of the Joint of a Transformer

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Jian Zhang ◽  
Xiaoxing Zhang ◽  
Song Xiao
Keyword(s):  
Electromagnetic Interference ◽  
Return Loss ◽  
Partial Discharge ◽  
Structural Features ◽  
Ultrahigh Frequency ◽  
Spiral Antenna ◽  
Radiation Characteristics ◽  
Linear Gradient ◽  
Vivaldi Antenna ◽  
Plane Spiral

In recent years, extensive research has been conducted on the ultrahigh-frequency (UHF) method. Considering that acquiring a partial discharge UHF signal is the first step in a series of tasks, such as fault diagnosis and defect location, the UHF sensor plays an important role in the UHF method. An antipodal Vivaldi antenna installed at a transformer’s joint is designed in this study according to the structural features of 750 kV transformers in China. Several effective structures, such as linear gradient microstrip and slot edge, are employed to improve the return loss and radiation characteristics. A metal box is designed after analyzing the influence of the metal around the antenna. The metal box can effectively shield against electromagnetic interference and does not deteriorate the performance of the antenna significantly. Experimental data show that this antenna is much more sensitive than the rectangular plane spiral antenna. The proposed antipodal Vivaldi antenna is suitable for detecting partial discharge in large transformers.

A transient electromagnetic disturbance testing system based on low-frequency-compensated symmetric TEM horn antenna

2020 ◽  
Vol 91 (12) ◽  
pp. 124702
Author(s):  
Yi Zhou ◽  
Yan-zhao Xie ◽  
Shao-fei Wang ◽  
Dao-zhong Zhang ◽  
Jie Yang
Keyword(s):  
Low Frequency ◽  
Horn Antenna ◽  
Testing System ◽  
Electromagnetic Disturbance ◽  
Transient Electromagnetic ◽  
Tem Horn

Magnetic Field Distribution in Aperture of TEM Horn Antenna for Close Proximity RF Immunity Test by Impulsive Excitation Wave

2020 ◽  
Vol 140 (12) ◽  
pp. 601-602
Author(s):  
Gen Kawakami ◽  
Ken Kawamata ◽  
Shinobu Ishigami ◽  
Takeshi Ishida ◽  
Katsushige Harima ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Distribution ◽  
Horn Antenna ◽  
Magnetic Field Distribution ◽  
Excitation Wave ◽  
Impulsive Excitation ◽  
Close Proximity ◽  
Tem Horn

scholarly journals Preparation and electromagnetic properties characterization of reduced graphene oxide/strontium hexaferrite nanocomposites

2020 ◽  
Vol 9 (1) ◽  
pp. 105-114 ◽  
Author(s):  
Shumin Du ◽  
Huaiyin Chen ◽  
Ruoyu Hong
Keyword(s):  
Electromagnetic Wave ◽  
Environmental Pollution ◽  
Electromagnetic Interference ◽  
Electromagnetic Waves ◽  
Rapid Development ◽  
Living Environment ◽  
World Health ◽  
Electromagnetic Properties ◽  
Strontium Hexaferrite ◽  
Wave Radiation

AbstractWith the rapid development of electronics and information technology, electronics and electrical equipment have been widely used in our daily lives. The living environment is full of electromagnetic waves of various frequencies and energy. Electromagnetic wave radiation has evolved into a new type of environmental pollution that has been listed by the WHO (World Health Organization) as the fourth largest source of environmental pollution after water, atmosphere, and noise. Studies have shown that when electromagnetic wave radiation is too much, it can cause neurological disorders. And electromagnetic interference will cause the abnormal operation of medical equipment, precision instruments and other equipment, and therefore cause incalculable consequences. Therefore, electromagnetic protection has become a hot issue of concern to the social and scientific circles.

Scattering of electromagnetic waves by hybrid waves in a two-electron-temperature plasma

1991 ◽  
Vol 46 (1) ◽  
pp. 99-106 ◽  
Author(s):  
S. K. Sharma ◽  
A. Sudarshan
Keyword(s):  
Growth Rate ◽  
Electron Temperature ◽  
High Frequency ◽  
Electromagnetic Waves ◽  
Low Frequency ◽  
Lower Hybrid ◽  
Stimulated Scattering ◽  
Coupled Modes ◽  
Temperature Plasma ◽  
Electrostatic Perturbation

In this paper, we use the hydrodynamic approach to study the stimulated scattering of high-frequency electromagnetic waves by a low-frequency electrostatic perturbation that is either an upper- or lower-hybrid wave in a two-electron-temperature plasma. Considering the four-wave interaction between a strong high-frequency pump and the low-frequency electrostatic perturbation (LHW or UHW), we obtain the dispersion relation for the scattered wave, which is then solved to obtain an explicit expression for the growth rate of the coupled modes. For a typical Q-machine plasma, results show that in both cases the growth rate increases with noh/noc. This is in contrast with the results of Guha & Asthana (1989), who predicted that, for scattering by a UHW perturbation, the growth rate should decrease with increasing noh/noc.

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