Resumen
Ground fault detection system in direct current systems with battery-powered inverters, where said direct current systems comprise at least one battery (1), direct current bars (2) and a plurality of inverters (3) that supply a plurality of loads in alternating current (4); the system is characterized by comprising: - a midpoint of the battery (9) where half of the battery voltage (1) is obtained; - a grounding impedance (6) between the midpoint of the battery (9) and ground (7); - a measuring equipment (8) of the current/voltage in the grounding impedance (6), obtaining a measured signal (22); - an analyzer device (10) in charge of analyzing the measured signal (22) and comprising: - means for harmonic decomposition (11) of the measured signal (22); - means for obtaining the amplitude and polarity of the measured signal (22) in direct current (12); - means for obtaining the amplitude of the measured signal (22) in alternating current (1 3); - means of comparison in direct current (14) in charge of comparing said amplitude in direct current with a predetermined value ADC FAULT (15), and obtaining two indicative output signals (19-20) of the existence or no ground fault of the DC part of the DC system with battery-powered inverters; - AC comparison means (16) in charge of comparing the amplitude of the measured signal (22) in alternating current with a predetermined value AAC FAIL (17), and obtaining at least one output signal (21) indicative of the existence or not of a ground fault of the alternating part of the direct current system with inverters powered by batteries. (Machine-translation by Google Translate, not legally binding)