NDLI: Study on the combined characteristics of UHF and optical signals induced by partial discharge at spacer surface in GIS

Content Provider	IET Digital Library
Author	Han, Xutao Guo, Ruochen Shen, Shuhang Li, Junhao Sun, Wei
Abstract	In this study, to improve the sensitivity and accuracy of the detection of surface partial discharge (PD) in gas insulation switchgears (GISs), a combination of ultra-high frequency (UHF) and optical methods is proposed based on an integrated sensor. The PD triggered by a fixed metal needle defect attached to the spacer is detected from PD inception to flashover in a real GIS. The characteristics of UHF and optical signals under different applied voltages are compared and analysed in terms of PD waveform, Phase Resolved Partial Discharge (PRPD) pattern, PD count and amplitude. The results show that the surface discharge process can be precisely divided into three stages according to the combined characteristics of the UHF and optical signals. The comparison of the two detection methods shows that the optical method can detect the weak avalanche PD under low voltage while UHF cannot, so it can detect more PDs than UHF method in an AC cycle. In addition, with the deterioration of solid insulation material, the amplitude of the optical signal increases significantly while the amplitude of the UHF signal only increases slightly.
Starting Page	3332
Ending Page	3337
Page Count	6
ISSN	17518687
Volume Number	14
e-ISSN	17518695
Issue Number	Issue 16, Aug (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/14/16
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2019.1953
Journal	IET Generation, Transmission & Distribution
Publisher Date	2020-05-22
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Avalanche Photodiode Charge Measurement Dielectric Breakdown And Discharges Electrical Instruments And Technique Fixed Metal Needle Gas Insulated Switchgear Gas Insulation Switchgears GIS Microwave Circuit And Device Microwave Measurement Technique Optical Signal Method Optical Sonsor Partial Discharge Measurement PD Inception PD Waveform PhotoDetector Photoelectric Device PRPD Pattern Sensing And Detecting Device Solid Insulation Material Spacer Surface Surface Partial Discharge Process UHF Detector UHF Measurement UHF Signal Method Weak Avalanche PD Detection Method
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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