Numerical Study of Estimating the Arrival Time of UHF Signals for Partial Discharge Localization in a Power Transformer

Ha, Sang Gyu; Cho, Jeahoon; Lee, June-Seok; Min, B.; Choi, Jaehoon; Jung, Kim Mi

doi:10.26866/jees.2018.18.2.94

Cited by 22 publications

(11 citation statements)

References 10 publications

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“…The external sensor and the internal sensor are determined by the installing location of the PD antenna. In contrast with the external sensor, the internal sensor has several main advantage such as high signal-to-noise ratio, high sensitivity, and anti-interference [1]- [4].…”

Section: Introductionmentioning

confidence: 99%

Design of a Circularly-Polarized UHF Antenna for Partial Discharge Detection

Park

Jung

2020

IEEE Access

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In this work, a circularly-polarized ultra-high frequency (UHF) partial discharge (PD) antenna is proposed to detect the PD in 0.6 GHz-1.7 GHz. The proposed PD antenna consists of an Archimedean spiral antenna, a balun, and a cavity. The Archimedean spiral antenna is embedded by FR-4 as substrate and superstrate for miniaturization. The microstrip-to-paired strips balun is designed to yield good performance in the return loss, insertion loss, and amplitude and phase imbalances which are of great necessity for low axial ratio. The cavity is employed to obtain unidirectional radiation patterns and prevent external signal interference. However, it is found that the originally-designed cavity-backed antenna does not work properly near 1.35 GHz due to resonance phenomena in the cavity. In this work, the cavity is modified to tackle this problem. The proposed UHF PD antenna is fabricated and measured and the results show that it provides good impedance matching, realized gain, radiation pattern, and circular polarization. INDEX TERMS Broadband antennas, partial discharges, UHF antennas.

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Section: Introductionmentioning

confidence: 99%

Design of a Circularly-Polarized UHF Antenna for Partial Discharge Detection

Park

Jung

2020

IEEE Access

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“…Therefore, in this work, the slot-type Doppler radar antenna with good performance is designed and fabricated. To demonstrate the performance of the designed Doppler radar antenna, the Doppler radar antenna in front of the Duke phantom's abdomen [14] is simulated by using Sim4life [15], which is based on the finite-difference time-domain (FDTD) method [16][17][18]. The performance is evaluated by analyzing the signal returned from the phantom.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Feasibility of a 24 GHz ISM-Band Doppler Radar Antenna for Near-Field Sensing of Human Respiration in Electromagnetic Aspects

Park

Kim

et al. 2020

Applied Sciences

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The feasibility study of a 24 GHz industrial, scientific, and medical (ISM) band Doppler radar antenna in electromagnetic aspects is numerically performed for near-field sensing of human respiration. The Doppler radar antenna consists of a transmitting (Tx) antenna and a receiving (Rx) antenna close to the human body for a wearable device. The designed slot-type Doppler radar antenna is embedded between an RO4350B superstrate and an FR-4 substrate. To obtain the higher radiation pattern of the antenna towards the human body, a ground plane reflector is placed underneath the substrate. The measured −10 dB reflection coefficient (S11) bandwidth is 23.74 to 25.56 GHz and the mutual coupling (S21) between Tx and Rx antennas is lower than −30 dB at target frequencies. The Doppler radar performance of the proposed Doppler radar antenna is performed numerically by investigating the signal returned from the human body. The Doppler effect due to human respiration is investigated through the I/Q and arctangent demodulation of the returned signal. According to the results, the phase variation of the returned signal is proportional to the displacement of the body surface, which is about 0.8 rad in accordance with 1 mm displacement. The numerical experiments indicate that the proposed Doppler radar antenna can be used for near-field sensing of human respiration in electromagnetic aspects.

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“…Typical equipment where UHF PD sensors are used could be power transformer and gasinsulated switchgear, GIS. The advantages of built-in sensors or internal sensors over external sensors are high sensitivity, high signal-to-noise ratio (SNR), and strong immunity to electromagnetic interferences [6]- [8].…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of Ultra-Wide Band Antenna for Partial Discharge Detection in High Voltage Power Equipment

et al. 2022

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Partial discharges (PD) are the most common and harmful threat to the health of electrical insulation of high voltage (HV) and high field (HF) equipment. The occurrence of PD activity in HV and MV equipment is at the same time a cause and a sign of insulation degradation that may eventually result in the breakdown of the HV power equipment. For the safe and reliable operation of HV power equipment, continuous PD monitoring needs to be conducted conveniently to prevent any unplanned power outages and damage to electrical power equipment. The ultra-high frequency (UHF) PD measurement method has been widely used as an effective technique to detect PD activity on HV power equipment due to its noninvasive principle. To enable PD detection accuracy, there is still a need for more sensitive PD sensors that can assist the UHF PD monitoring system by suppressing ambient background noise and low-frequency electromagnetic interferences from telecommunication such as GSM signals. To tackle the sensitivity issues, this article presents a new design of ultra-wideband (UWB) microstrip patch antenna that is capable of effective suppression of low-frequency interference signals. The proposed antenna, designed, simulated, and optimized using the CST Microwave Studio software, has a bandwidth of 3.3GHz, below -10dB, in the operating frequency range of 1.2GHz-4.5GHz. The prototype of this antenna, printed on an FR4 substrate of a thickness of 1.6mm and a dielectric constant of 4.4, featuring a compact size of 100mm × 100mm × 1.6mm, was implemented to detect PD through laboratory experiments. This paper shows that the designed UWB antenna has high sensitivity, good noise rejection and it is, therefore, a promising candidate sensor for PD detection on HV equipment.INDEX TERMS Partial discharge, UHF sensors, high-voltage equipment, UWB antenna.

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Numerical Study of Estimating the Arrival Time of UHF Signals for Partial Discharge Localization in a Power Transformer

Cited by 22 publications

References 10 publications

Design of a Circularly-Polarized UHF Antenna for Partial Discharge Detection

Design of a Circularly-Polarized UHF Antenna for Partial Discharge Detection

Numerical Study on the Feasibility of a 24 GHz ISM-Band Doppler Radar Antenna for Near-Field Sensing of Human Respiration in Electromagnetic Aspects

Design and Implementation of Ultra-Wide Band Antenna for Partial Discharge Detection in High Voltage Power Equipment

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