The atmospheric carbon dioxide concentration has increased since widespread industrialization began. Moreover, there are currently places where the carbon dioxide concentration in the air is high, for example, inside tunnels and forest fire area. Hence, it is important to research the effect of the CO 2 concentration on the insulation characteristics of air. This study examined the sparkover characteristics of air-CO 2 mixed gases. Two electrodes were used: a rod 5 mm in diameter and a plane electrode 400 mm in diameter. The gap length was 62.5 mm. Synthetic air (nitrogen: 79%, oxygen: 21%) was used in the sparkover tests, and the sparkover voltage was measured in several air-CO 2 mixtures. High DC and AC voltages were applied to the electrodes in the sparkover voltage measurement tests. Streamers were examined under several conditions using an image intensifier. The results show that the sparkover voltage depends on the CO 2 concentration. Specifically, when the CO 2 level increased 0.01% from 0.75% to 0.76%, the sparkover voltage fell rapidly by approximately 20 kV (from 54.3 kV to 33.7 kV) under a positive DC voltage. Similarly, the sparkover voltage also depends on the CO 2 concentration under a negative DC voltage and a high AC voltage.
E SD ground tEsts w m l:n:ge--s::aE ffil3r panels were mnduct:B:1 :in sin ul3.terl bN -e:rrth-oIbk pl3sn a EIlvironrn ent. Jh thore expedn EIlts, the propagati::m :£ngth and vebc:i!¥ were mffiSlrej :in an argon pl3sn a atm a:phere, of whili the pl3sn a densit¥ was approxin atE1y 10 10 m -3 • Add:iti:>na.JJy, the pres:un:s w ere s=t at 4 D x 10-2 , 19 X 10-2 and 2 D x 10-3 Pa. The re:uJt::s :indi:aterl that the pl3sn a propagatbn :£ngth was grmtEr" than 3.75 m at alipres:ure mnd:iti:m :in this study. The pl3sn a propagamn vebc:i!¥ de::reas:rl w:ith the d~of the backpres:ure. The vebc:ii¥w as approxin atE1y 10 4 m "sat2 D x 10-3 Pa.
Solar panel failure is putatively caused by electrostatic charge and discharge. An investigation of its causes and efforts to determine measures for the future require both verification under as realistic a space environment as possible and enhanced ground tests. A plasma chamber was developed at the Tsukuba Space Center to carry out charge/discharge tests to verify low-earth-orbit satellites solar panel durability against electro-static discharge (ESD).This paper describes results of solar panel ESD tests at extremely low temperatures. The primary arc inception threshold voltages at 160 K and 230 K were similar at room temperature. In contrast, the rate of primary arc inception of 230 K was five times and the rate of primary arc inception of 160 K was ten times as much as that at 300 K at applied voltage 200 V. We also measured the capacitance C and dielectric constant r of the cover glass, which shows high resistivity and which is fairly constant over many frequencies. Apparently, the dielectric constant values have a slight influence on the rate of primary arc inception.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.