An Ultrawideband Conical Monopole With Radome for Detection of Partial Discharges

Yadam, Yugandhara Rao; Sarathi, R.; Arunachalam, Kavitha

doi:10.1109/jsen.2021.3090099

Cited by 21 publications

(14 citation statements)

References 21 publications

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“…As a result, part of the PD induced UHF signal leaks out of the GIS and weak EM emissions could also be detected by an externa l UHF sensor [21]. As the signal strength of the leaked EM wave is relatively weak [16], internal UHF sensors are widely investigated for PD detection in GIS [22][23][24][25][26]. Wang et al studied the propagation characteristics of PD induced UHF signals in simple straight and L-GIS for a protrusion defect using time domain simulations and numerical probes [27,28].…”

Section: Introductionmentioning

confidence: 99%

“…Experimental study of PD activity in GIS test cells using commercial UHF disc sensor indicated that the UHF signal bandwidth varied depending on the PD defect type [33]. Based on the earlier work, we developed a 150 mm diameter ultrawideband conical monopole antenna (CMA) with protective radome, operating bandwidth of 0.5−6.8 GHz and mean effective height of 19.4 mm for PD sensing [25]. PD signals gathered by the UHF CMA for Corona, particle movement and surface discharge activity in GIS test cells indicated about two-fold increase in the induced voltage when compared to commercial disc sensor [25].…”

Section: Introductionmentioning

confidence: 99%

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Numerical and Experimental Investigations on Influence of Internal Defect Parameters on Partial Discharge Induced UHF Signals in Gas Insulated Switchgear

2022

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A detailed study of the influence of internal defect parameters on partial discharge (PD) induced ultrahigh frequency (UHF) signals propagated through an L section of metal encapsulated gas insulated switchgear (GIS) is presented. The study is carried out using PD defect model with varying rise time, defect size, location, and orientation, an ultrawideband UHF internal sensor, and 3 m long L-GIS with dielectric spacers, shorting plates, hand holes and bus bar with disconnector. Presence of higher order modes, multipath propagation, losses, and dispersion inside L-GIS were observed to influence the time and frequency domain characteristics of PD signals induced in the internal UHF sensor with 0.5 to 6.8 GHz operating bandwidth and directional radiation pattern. The rise time of PD signals significantly influenced UHF signal characteristics in time and frequency domains while PD defect size, location and angular orientation primarily affected the signal amplitude. UHF sensor measurements confirmed the complex behavior of PD induced electromagnetic wave propagation inside L-GIS for varying defect parameters in agreement with the simulations. Despite the complex behavior, it is concluded that PD sensing in GIS is possible using ultrawideband internal UHF sensor.INDEX TERMS Gas insulated switchgear, partial discharge, protrusion defect, ultrahigh frequency.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigations on Influence of Internal Defect Parameters on Partial Discharge Induced UHF Signals in Gas Insulated Switchgear

2022

Self Cite

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“…[ 6 ] proposes a novel PD detection method for transformers on-site adopting its component as a UHF sensor. In [ 7 ], a UHF antenna with a relatively small aperture and radome for PD detection was designed. In [ 8 ], a microstrip antenna was designed with a radiating element shape based on the leaf of the Jatropha mollissima (Pohl) Baill plant for PD detection.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Electromagnetic Properties of New Graphene Partial Discharge Sensor Electrode Plate Material

Zhang

2022

Sensors

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Advanced sensing and measurement technology is the key to realizing the transparent power grid and electric internet of things. Meanwhile, sensors, as an indispensable part of the smart grid, can monitor, collect, process, and transmit various types of data information of the power system in real-time. In this way, it is possible to further control the power system. Among them, partial discharge (PD) sensors are of great importance in the fields of online monitoring of insulation condition, intelligent equipment control, and power maintenance of power systems. Therefore, this paper intends to focus on advanced sensing materials and study new materials for the improvement for partial discharge sensors. As two-dimensional material, graphene is introduced. The electromagnetic properties of graphene partial discharge sensor electrode plate material are analyzed theoretically. By studying the influence of different chemical potential, relaxation time, temperature, and frequency, we obtain the changing curve of conductivity, dielectric constant, and refractive index. A linear regression model based on the least-squares method was developed for the three electromagnetic properties. Finally, the simulation and experiment verified that the graphene partial discharge sensor has better absorption of the partial discharge signal. This study can apply to the design of graphene partial discharge sensors.

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“…Aten et al investigate a monopole antenna loaded with a top hat with the bandwidth of 800-2400 MHz but with a diameter of 0.8λ max in [7]. Yadam et al design an ultrawideband conical monopole antenna that covers the band from 0.5 to 3 GHz to detect partial discharges [8].…”

Section: Introductionmentioning

confidence: 99%

VHF/UHF Wideband Slim Monopole Antenna with Distributed Matching Structures

Qin

Sun

2022

International Journal of Antennas and Propagation

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This paper presents a wideband monopole antenna with distributed matching structures operating on VHF/UHF bands. The antenna consists of a slim rectangular metal strip with a T-type slot etched on the upper half, two rectangular slots on the lower half, and two rectangular plates soldered with the bottom end of the main strip. The antenna is installed on a metal case which serves as ground. To achieve a wide bandwidth, an impedance matching network consisting of the distributed structures, which are composed of two metal plates and a metal thin strip, is devised and integrated with the main radiating strip. The T-type slot near the top tip of the main strip is used for the miniaturization of the antenna. The proposed antenna is fabricated and measured, and the measured results are in good agreement with the simulated results. The sizes of the proposed antenna and the case are 0.19λmax × 0.014λmax and 0.17λmax × 0.1λmax × 0.034λmax, respectively. The operating bandwidth is from 203.7 to 516.9 MHz (2.54 octaves) with the condition of VSWR ≤ 3 : 1. This antenna has a slim structure, a wide bandwidth covering partially VHF and UHF bands, and omnidirectional radiation patterns, so it can be the candidate for the applications of backpacked radio stations in military communication scenarios.

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An Ultrawideband Conical Monopole With Radome for Detection of Partial Discharges

Cited by 21 publications

References 21 publications

Numerical and Experimental Investigations on Influence of Internal Defect Parameters on Partial Discharge Induced UHF Signals in Gas Insulated Switchgear

Numerical and Experimental Investigations on Influence of Internal Defect Parameters on Partial Discharge Induced UHF Signals in Gas Insulated Switchgear

Analysis of Electromagnetic Properties of New Graphene Partial Discharge Sensor Electrode Plate Material

VHF/UHF Wideband Slim Monopole Antenna with Distributed Matching Structures

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