drilling rig,DC drilling Rigs,drilling machinery Model:ZJ50D, ZJ70D Nominal drilling depth, m:5000,7000. 1)DC Rig adopts AC-SCR-DC drive mode, using DC motors to drive ... dia.) × 35MPaElectric drive modeAC-SCR-DC,one to one, or one to twoNumber of main generator × capacity3×1500KVA4×1900KVA drilling rig,DC drilling Rigs,drilling machinery.... DC drilling Rigs