Online direct current system voltage monitoring means

The utility model relates to a voltage monitoring technology field, an online direct current system voltage monitoring means, it includes direct current voltage cathode, the DC voltage negative pole,three -phase AC voltage, still include the casing and set up the AD sampling module in the casing, host system, output module and communication module, the input of AD sampling module respectively with direct current voltage cathode, the DC voltage negative pole, three -phase AC voltage's output electricity is connected, the electricity is connected between AD sampling module and the host system,last being provided with of output module exchanges the decompression alarm interface, direct current decompression alarm interface, the direct current is scurried and is exchanged alarm interface anddirect current voltage abnormity alarm interface, output module is connected with the host system electricity, communication module is connected with the host system electricity. The utility model has the advantages of reasona