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

Sensors

Jingcun Liu²  Guogang Zhang¹  Jinlong Dong²  Jianhua Wang² 

[1] State Key Lab of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China;

关键词: equiangular spiral antenna;    high-voltage electrical equipment;    microstrip balun;    partial discharge;    ultra-high-frequency antenna;   

DOI  :  10.3390/s151129434

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.