Study on characteristics gases of metal protrusions partial discharge in 10‐kV air‐insulated switchgear

• Published in: IET science, measurement & technology measurement & technology, 2023-08, Vol.17 (6), p.221-229
• Main Authors: Tan, Qipeng, Song, Bin, Wang, Linong, Wu, Shaocheng
• Format: Article
• Language: English
• Subjects: corona; distribution networks; gaseous insulation; gas‐insulated switchgear; humidity; partial discharges
• ISSN: 1751-8822; 1751-8830
• DOI: 10.1049/smt2.12147

Air‐insulated switchgear plays an important role in distribution network and partial discharge (PD) is one of the common faults in its operation. The method of gas component analysis, which is to detect chemical gas products, is a novel one to discover PD. In order to study the feasibility of the method, the monitoring experiment of characteristic gases, comprising carbon monoxide (CO), nitrogen dioxide (NO2), and ozone (O3), of metal protrusion PD is carried out. This paper conducts the comparative experiments on three main factors affecting PD: voltage, air humidity and degree of protrusion, as well as studies how they affect the formation of characteristic gases. According to the experimental result, higher applied voltage promotes the formation of characteristic gases in the same conditions. In addition, with the increase of humidity from 40% to 75%, the generation of gases is inhibited. Furthermore, when the needle–plate distance is 30 mm, the gas concentration has almost no change within 6 h, which is different from that of 10 mm. In conclusion, the difference in gases concentration reveals the influence of three main factors on the generation of characteristic gases and provides an analytical basis for PD detection by gas composition analysis. In order to study the feasibility of the method of gas composition analysis for 10‐kV air‐insulated switchgear, this paper carried out a monitoring experiment of characteristic gases, comprising CO, NO2 and O3, of metal protrusion PD. In addition, three practical factors were considered to carry out the comparative experiments: voltage, air humidity and defect degree, studying how they affect the formation of characteristic gases. It is the main conclusion of this study that higher applied voltage and defect degree promote the formation of characteristic gases, while air humidity plays the opposite role.