Design of Broadband Planar Spiral Antenna for Partial Discharge in Cable

2013 ◽  
Vol 816-817 ◽  
pp. 443-445
Author(s):  
Yong Chun Liang ◽  
Zhao Long Qiao ◽  
Zhi Peng Ge ◽  
Teng Jiao Feng
Keyword(s):  
High Frequency ◽  
Partial Discharge ◽  
High Sensitivity ◽  
Frequency Component ◽  
Simulation Software ◽  
Superior Performance ◽  
Spiral Antenna ◽  
Archimedean Spiral ◽  
Xlpe Cable ◽  
Ansoft Hfss

The detection of partial discharge in power cables is an effective method to diagnosis early fault of XLPE cable . When partial discharge occurs, it emits abundant frequency component in ultra-high frequency (UHF) band, and broadband planar spiral antenna is an effective sensor to detect UHF partial discharge signals. High frequency electromagnetic simulation software Ansoft HFSS is used to simulate and analysis planar Equiangular spiral antenna and Archimedean spiral antenna. The simulation results show that the two kinds of antennas work effectively in 400 MHZ ~ 1 GHZ frequency band and are high sensitivity and superior performance. Because of with smaller size and larger gain, the Archimedean spiral antenna is used to detect UHF signals of partial discharge in XLPE cable.

scholarly journals Design of a UHF Antenna for Partial Discharge Detection of Power Equipment

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Youyuan Wang ◽  
Junfeng Wu ◽  
Weigen Chen ◽  
Yajun Wang
Keyword(s):  
High Frequency ◽  
Microstrip Antenna ◽  
Partial Discharge ◽  
Dielectric Materials ◽  
Coaxial Cable ◽  
Detection Sensitivity ◽  
Duty Ratio ◽  
Spiral Antenna ◽  
Archimedean Spiral ◽  
Ultra High Frequency

A single-arm Archimedean spiral antenna that can be directly fed by a 50 Ωcoaxial cable is investigated in this study. Every antenna parameter is optimized under simulation to make the antenna work in the ultra-high frequency band. The influence of dielectric materials, feed cone angle, and antenna duty ratio is also examined. Partial discharge (PD) experiments on several typical artificial insulation defects are conducted, and a single-arm Archimedean spiral antenna and a typical microstrip antenna are utilized for PD measurement. The PD characteristics of different insulation defects are also analyzed. Results show that the designed antenna is suitable for ultra-high frequency monitoring. The detection sensitivity of the single-arm spiral antenna is superior to that of the ordinary microstrip antenna. The former can be utilized in wide-band measurement fields.

scholarly journals Case Analysis on Partial Discharge Signal of XLPE Cable T-Joint by Using High-Frequency Pulse Current Method

2017 ◽  
Vol 141 ◽  
pp. 545-550 ◽  
Author(s):  
Zhang Hao ◽  
Duan Yubing ◽  
Wang Bin ◽  
Liu Hui ◽  
Lin Ying ◽  
...  
Keyword(s):  
High Frequency ◽  
Pulse Current ◽  
Partial Discharge ◽  
Case Analysis ◽  
Current Method ◽  
Xlpe Cable ◽  
Frequency Pulse

scholarly journals Design of a Dual Band Coplanar Antenna for WiMax Applications

2018 ◽  
Vol 7 (3.32) ◽  
pp. 11
Author(s):  
Wen Cheng Lai ◽  
Lin Chuan Tsai ◽  
Chia Wen Li
Keyword(s):  
High Frequency ◽  
Return Loss ◽  
Simulation Software ◽  
Circuit Board ◽  
Antenna Design ◽  
Dual Band ◽  
Electromagnetic Simulation ◽  
Continuous Simulation ◽  
Ansoft Hfss ◽  
Measurement Results

Ansoft HFSS electromagnetic simulation software was used in this study to simulate the design of two frequency band dual band coplanar antennas for WiMax (3.44GHz to 3.69GHz) and (5.25GHz to 5.85GHz) with center frequencies of 3.5GHz and 5.25GHz respectively. The steps of antenna design simulation are shown in figures of Return Loss, Current Distribution and 3D Radiation Pattern. Through continuous simulation, modification, and correction, the antenna can achieve the desired effect. Metal was used as the reflective material for the antenna designed, the antenna was covered by the material as a partition between the antenna and the metal, and FR4 was used as high-frequency circuit board (dielectric coefficient = 4.4). The simulation and measurement results were found to have consistent and good characteristics.  

High Speed and High Sensitivity Slip Sensor for Dexterous Grasping

2012 ◽  
Vol 24 (2) ◽  
pp. 298-310 ◽  
Author(s):  
Seiichi Teshigawara ◽  
◽  
Takahiro Tsutsumi ◽  
Yosuke Suzuki ◽  
Makoto Shimojo ◽  
...  
Keyword(s):  
High Frequency ◽  
High Speed ◽  
High Sensitivity ◽  
Frequency Component ◽  
High Frequency Component ◽  
Robot Hand ◽  
Voltage Signal ◽  
Frequency Components ◽  
Slip Sensor ◽  
Gripping Force

Slip-detecting tactile sensors are essential if robot hands are ever to achieve the gripping motions of human hands. In our previous research, we developed a flexible, thin, and lightweight slip sensor that exploits resistance changes in pressure conductive rubber. However, using this sensor, it was difficult to distinguish between object slip and changes in normal force. Therefore, in this research, we investigate a method of identifying object slip by analyzing the frequency components of the output signal from the sensor. As a result, we find that high-frequency components of several kilohertz or more are included in the complex voltage signal immediately before object slip. Therefore, using this high-frequency component, we develop a simple structure sensor that distinguishes between both contact and a state of immediately before slip with high sensitivity. Moreover, we design a slip sensor for a robot hand and examine the effects of noise by manipulation. Finally, we describe an experiment involving the adjustment of the gripping force of a robot hand.

On-Line Condition Monitoring for Power Transformers Based on UHF PD Measurements

2012 ◽  
Vol 614-615 ◽  
pp. 1158-1162
Author(s):  
Ming Jun Liu ◽  
Jian Zhang Zou ◽  
Qiu Kuan Zhou ◽  
Yang Lin Li ◽  
Nian Ping Yan
Keyword(s):  
Monitoring System ◽  
High Frequency ◽  
Power Transformer ◽  
Partial Discharge ◽  
High Sensitivity ◽  
Power Transformers ◽  
Simulated Experiment ◽  
Envelope Detection ◽  
On Line ◽  
Line Condition

An on-line monitoring system based on ultra high frequency (UHF) partial discharge (PD) measurements was developed for power transformers. The UHF PD signals were coupled by a UHF sensor and preprocessed by peak envelope detection technique. The system has high sensitivity, strong ability of interference suppression and well real-time capability according to the simulated experiment in lab and field test of a power transformer. Experimental results showed that the forepart PD faults could be discovered by the analysis of UHF PD signals. The on-line monitoring system has already been applied on a power transformer for years.

Robust Edge Detection Based on Anisotropic Mathematical Morphology and Scale Multiplication in NSCT Domain

2014 ◽  
Vol 595 ◽  
pp. 289-294
Author(s):  
Yi Mian Dai ◽  
Yi Quan Wu
Keyword(s):  
Edge Detection ◽  
Mathematical Morphology ◽  
High Frequency ◽  
Low Frequency ◽  
Frequency Component ◽  
Superior Performance ◽  
Great Ability ◽  
Morphological Gradient ◽  
Frequency Components ◽  
Edge Detection Method

A novel edge detection method based on anisotropic mathematical morphology and scale multiplication in nonsubsampled contourlet transform (NSCT) domain is proposed to obtain a superior and robust performance under heavy noise. One preliminary result is obtained using anisotropic morphological gradient of the low-frequency component, yielding a single-pixel response with few pseudo edges. Due to the great ability of NSCT to localize distributed discontinuities such as edges, scale multiplication results of high-frequency components can get rid of a large amount of noise and produce well-localized edge candidates. The final result is a fusion of the detection results of low-frequency component and high-frequency components. Detailed experiments compared with other state-of-the-art methods demonstrate that the proposed method has a superior performance of edge detection and is quite robust even under heavy noise.

XLPE Cable Insulation Enhancement Mechanism Based on Isopropoxide Catalyzed Siloxane

2012 ◽  
Vol 554-556 ◽  
pp. 277-281
Author(s):  
Fan Liu ◽  
Xian Tao Tao ◽  
Lin Yang ◽  
Ping Liu ◽  
Kai Zhou
Keyword(s):  
High Frequency ◽  
Partial Discharge ◽  
Accelerated Aging ◽  
Inorganic Particles ◽  
Xlpe Cable ◽  
Enhancement Mechanism ◽  
Water Tree ◽  
Insulation Defect ◽  
Made In ◽  
New Discovery

In this paper, needle-shape insulation defect was made in XLPE cable samples. With high-voltage and high-frequency accelerated aging, water tree was formed inside XLPE layer. One group of the samples was injected siloxane catalyzed by isopropoxide for rejuvenation, and the breakdown voltage was significantly greater than new samples. Nano-inorganic particles were observed by scanning electron microscope (SEM) inside the breakdown channels of rejuvenated samples. The insulation enhancement mechanism is described in this paper based on the new discovery, that the insulating property of cables is enhanced by the nano-inorganic particles, because of its ability to inhibit the partial discharge damage inside the water tree channel.

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