Alternating current power supply into direct current power supply and direct current power supply ripple detection apparatus used for transformer substation

The utility model discloses an alternating current power supply into direct current power supply and direct current power supply ripple detection apparatus used for a transformer substation. The detection apparatus comprises a transformer substation direct current bus, a working power supply module (15), an alternating current voltage sampling circuit (3), a band-pass filtering circuit (4), a direct current voltage sampling circuit (8), a filter circuit (9), a ripple voltage sampling circuit (12) and the like. A CPU module (6) is connected with a voltage analog-to-digital conversion circuit (5), a direct current voltage analog to digital conversion circuit (10), a ripple voltage analog-to-digital conversion module (13), an alarm uploading communication interface (16), a display screen (7), a man-machine conversation keyboard (11) and an alarm output circuit (14) respectively. The apparatus of the utility model is the apparatus which rapidly detects whether the alternating current power supply is into the dire