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

Abstract

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.

Synthesis and Catalytic Performance of High-Entropy Rare-Earth Perovskite Nanofibers: (Y0.2La0.2Nd0.2Gd0.2Sm0.2)CoO3 in Low-Temperature Carbon Monoxide Oxidation

“…CO catalysis plays a key role not only in the current context of oxidation in catalytic converters of exhaust gases in combustion engine, for which demand is expected to decline in the near future, but also in various other technological applications, such as high-voltage electric transmissions [44]. Recent advances in medium-and high-voltage power transmission application, particularly the shift to SF 6 -free gas-insulated systems using CO 2 gas mixtures, underscore the importance of CO catalysis [45,46]. During combustion processes in such systems, high energy levels can induce the decomposition of CO 2 in plasma, resulting in the formation of a variety of toxic gases, but mainly CO.…”