Abstract: A system for monitoring and maintaining luminaires using an unmanned aerial vehicle. The system comprises one or more luminaires, a computing device and one or more Unmanned Aerial Vehicle. The computing device receives the information about the working condition of the one or more luminaires accordingly generate a command for a UAV of the one or more UAVs to diagnose and identify one or more issues with the one or more luminaires causing the faulty condition.

Abstract: A system (100) for protection of solid state electrical devices against over and/or under voltage conditions, comprises an AC input (110), supplying an AC connected with fuse, AC filters (112), connected with the AC input (110) via the fuse, configured to filter the AC, rectifiers (114), connected with the AC filters (112), configured to convert the AC line voltage into DC line voltage thereby forming a DC bus voltage, buck converters (118), connected with the rectifiers (114), configured to step down the DC bus voltage thereby providing a first DC voltage, voltage dividers (116), connected with the rectifiers (114), configured to divide the DC bus voltage, thereby generating a second DC voltage, a threshold detector (120) connected with the buck converters (118) and the voltage dividers (116), a relay (122) connected with the threshold detector (120), the AC input (110) supplying the AC and one or more loads (124).