A series of aluminium electrolysis DC control device, which comprises electrolysis series (1), which is characterized in that the cathode busbar (2) and the negative bus bar (3) is connected to the rectifier and the electrolysis series (1); from the anode busbar (2) lead cathode (4) and negative busbar busbar (3 lead anode busbar) (5), (1) lead electrolysis series (6), middle small bus and the earth zero potential small bus (7); series voltage transmitter (9) lead cathode (4) on the cathode busbar busbar voltage meter series (5) and (25) voltage series connection; the transmitter (10) lead cathode (4) on the cathode busbar busbar voltage transmitter (5), (11) cited positive small bus (4) for mid small bus (6), (12) negative voltage transmitter induced small bus (5) the neutral point small bus (6), (16) lead cathode voltage transmitter (4) on the small bus zero potential small bus (7), (17) negative voltage transmitter induced small bus (5) of the earth zero potential small bus (7) respectively, and total PLC (29) connection cabinet series; voltage transmission device (13) cited positive small bus (4) on the cathode busbar (5), (14) lead cathode voltage transmitter (4) small bus midpoint of small bus (6), (15) negative voltage transmitter induced small bus (5) for mid small bus (6) and connect the recorder (28); the transmitter (18) cited the midpoint (6) on the small bus zero potential small bus (7) connected with the computing station; series current measuring device (19) connected in series with the anode busbar (2) , and compared with series of current transducer (21), (22), (23) the series connection; current transmitter (21) connected to the ammeter series (26), current (27), the total extension of isolator PLC cabinet (29), a series of current transmitter (22) connected to the total adjustment cabinet series, current transmitter (23) connected computing station.
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