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Sensors 2015, 15(11), 29434-29451; doi:10.3390/s151129434

Study on Miniaturized UHF Antennas for Partial Discharge Detection in High-Voltage Electrical Equipment

State Key Lab of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
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Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 18 August 2015 / Revised: 3 November 2015 / Accepted: 10 November 2015 / Published: 20 November 2015
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [2559 KB, uploaded 20 November 2015]   |  

Abstract

Detecting partial discharge (PD) is an effective way to evaluate the condition of high-voltage electrical equipment insulation. The UHF detection method has attracted attention due to its high sensitivity, strong interference resistance, and ability to locate PDs. In this paper, a miniaturized equiangular spiral antenna (ESA) for UHF detection that uses a printed circuit board is proposed. I-shaped, L-shaped, and C-shaped microstrip baluns were designed to match the impedance between the ESA and coaxial cable and were verified by a vector network analyzer. For comparison, three other types of UHF antenna were also designed: A microstrip patch antenna, a microstrip slot antenna, and a printed dipole antenna. Their antenna factors were calibrated in a uniform electric field of different frequencies modulated in a gigahertz transverse electromagnetic cell. We performed comparison experiments on PD signal detection using an artificial defect model based on the international IEC 60270 standard. We also conducted time-delay test experiments on the ESA sensor to locate a PD source. It was found that the proposed ESA sensor meets PD signal detection requirements. The sensor’s compact size makes it suitable for internal installation in high-voltage electrical equipment. View Full-Text
Keywords: equiangular spiral antenna; high-voltage electrical equipment; microstrip balun; partial discharge; ultra-high-frequency antenna equiangular spiral antenna; high-voltage electrical equipment; microstrip balun; partial discharge; ultra-high-frequency antenna
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Liu, J.; Zhang, G.; Dong, J.; Wang, J. Study on Miniaturized UHF Antennas for Partial Discharge Detection in High-Voltage Electrical Equipment. Sensors 2015, 15, 29434-29451.

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