NOV SCR 4 x 4 Model 1400

NOV SCR 4×4 Model 1400 – Typical Specifications

Manufacturer: National Oilwell Varco (NOV)
SCR System: Ross Hill SCR
Configuration: 4 SCR bays × 4 transformer sections
Application: Land drilling rig power control

Electrical:

• Power system type: SCR (silicon controlled rectifier)

• Number of SCR bays: 4

• Transformers: 4 (one per SCR bay)

• Typical rig size supported: ~1500–2000 HP

• Input voltage (typical): 600 VAC or 690 VAC, 3-phase, 60 Hz (varies)

• Output: Controlled DC for SCR drives feeding AC motors

• MCC: Commonly GE E9000 or equivalent

• Top drive breaker: Often included

• Generator compatibility: Diesel generator sets

Mechanical / Structural:

• House type: Enclosed SCR control house

• Length: ~32 ft (varies with porch and options)

• Mounting: Skid-mounted

• Access: Front and/or side doors

• Construction: Oilfield-rated steel enclosure

Environmental:

• Cooling: Dual HVAC / air conditioning units

• Operating environment: Land rig, harsh duty

• Ventilation: Forced air with filtered intake

Typical Loads Controlled:

• Drawworks

• Mud pumps

• Top drive

• Auxiliary rig motors

Notes:

• “Model 1400” commonly refers to the SCR rating class, not a single fixed electrical spec

• Final ratings depend on transformer size, SCR stack rating, and customer order

• OEM drawings and electrical one-lines are serial-number specific