ZJ50/3150D rig adopt 3 sets of CAT3512B+SR4B/1900KVA diesel generator sets as the main power. The commutated 600V/50Hz AC by SCR silicon controlled rectifier drive the DC motors of drawworks , rotary table and mud pumps. Drawworks is drived with 2 sets of 800kW DC motors, the main brake of which is two-sided hydraulic disc brake and the auxiliary brake is vortex electromagnetic brake. The rotary table is drived with 1 set of 800kW DC motor and the 2 sets of mud pumps are drived with 2 sets of 800kW DC motors separately.
1. Adopts one time raising type, substructure, mast and all equipments are installed at low position, and raise the mast and substructure by the power from the winch.
2. Open groove of drawwork is equipped with 3 kinds of safety devices of crown block. the main brake of which is hydraulic disc brake and the auxiliary brake is vortex electromagnetic brake.