Experimental analysis reveals closing speed and pressure influence pre-strike arc duration in medium voltage load-break switches, suggesting measures to enhance contact life.
Short-circuit current making in a medium voltage load-break switch using N2/CO2 is expected to result in longer pre-strike arcs compared to SF6, due to lower dielectric strength, leading to increased contact degradation. Measures to limit impact of pre-strike arc on the contact system are needed. This paper aims to experimentally investigate the influence of closing speed, filling pressure and mixing ratio on pre-strike arc duration towards increasing contact system life time.
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Suarez et al. (2025) studied this question.
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