| Along with the exaltation requested to the energy system, the solar array of the aerospace machine's power supply system in the future will be toward to the trend development of high power, high voltage. Especially, the communications satellite of GEO orbit (the Earth synchronous orbit) turn widespread adoption high-voltage arsenic gallium solar array as a main energy. However, the exaltation of working voltage will increase the opportunity of the solar array and space environment to take the interaction, and a new failure mode appeared because of the space static electricity discharging. Therefore, we have to research electrostatic discharges (ESD) mechanism of the high-voltage solar array and explore the defending technique.This thesis mainly analyzed the charging/discharging effects about high-voltage arsenic gallium solar array in the GEO plasma environment. In this paper we present a theory and supporting laboratory data, which show how small, low energy, spacecraft charging ESD occur on a high voltage solar array with high negative potential relative to the surrounding plasma. If the potential difference between adjacent strings overruns 70V and the current per string overruns 1.8A, those discharges will lead to larger, sustained discharges, which permanently damage the solar arrays.We explored the defending technique about high-voltage solar array anti-ESD through analyzing the ESD effects. The method to prevent arcing is:a) Adding ITO(Indium Tin Oxide)coating to cover-glass substrateb) Reducing the potential difference between adjacent strings under 70Vc) Reducing the current per string under 1.8Ad) Protection of the Kapton substrate by an RTV barrier between solar cellsThen we performed ground simulation test to reappear ESD and secondary discharging phenomenon. The simulation experiment has shown that ESD triggered the no protected solar array samples failure mechanism, but the secondary discharge phenomena was not occurred in the protected solar array samples.
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