Three CATERPILAR 3512A diesel engine generator sets are combined to generate 3 phase 600V 50Hz alternating current, which is not only supplied for five SCR cabinets, but also for 380V MCC system via 1000KVA main transformer. After rectified by SCR cubicles, 3 phase 600V 50Hz alternating current changes to 0-750V (adjustable) direct current, and then drives DC motors of drawworks, rotary table, and mud pumps. The drawworks is driven by two DC motors; the rotary table is driven by one DC motor; and each mud pump is driven by two DC motors.
“K” type mast, slingshot or folding type substructure. The drawworks adopts hydraulic disc brake as main brake and water-cooling electromagnetic eddy current brake as auxiliary brake. The mud pumps use narrow V-belt transmission.
