ZJ70D drilling rig: 1)Drilling depth,7000m, 2)Hook load, 4500kN, 3)Drawwork power,2000kw, 4)Auxiliary brake:E.T. N brake ZJ70/4500D rig is drived with 4 sets of CAT3512 diesel generating sets. 0~750V DC transduced from 50Hz AC by SCR system drive the YZ08/YZ08A DC motors connected with 2000hp drawworks and mud pump. Drawworks is drived with 2 sets of motors, 2 sets of mud pumps are drived with 2 ...