DC Drive System

DC Drive system comprises generator controls, SCR controls, Driller's console, AC/DC control module, SCR or AC Power Control House. Do contact us for further sales enquiries.

Generator Controls:

• Multi-function instrument / meters
• Accurately control engine speed and generator voltage
• Ground fault detection system
• Synchronizing panel
• Power limit circuit
• Analog or digital controls
• Multi-protection of engine generators

SCR Controls:

• Rectifier bridge rated at 2000 amps continuous at 750 volts DC
• Surge suppression system
• Multiple assignment of the SCR rectifier bridges through the use of contactors
• Digital or analog controls
• Lockout switches for each motor
• PLC

Driller’s Console

The console is located on the drill floor and is the main control and monitoring device for each drive function fo the drilling rig. It contains the control switches for the SCR assignments, throttles for each motor, rotary table torque limit control, and drawworks or rotary table reversing, selection switches, instruments, push buttons.

• Explosion-proof pressurization system with alarms
• Drip-proof stainless steel construction
• Foot throttle for control of the drawworks during hoisting
• PLC-based control equipped with cable bypass for spare use.
• Indicator lamps
• Touch screen and display screen

AC / DC Control Module

TSC Offshore's AC / DC Control Module distinctive competency lies in the reduction of all vital electronics for the AC and DC functions of the system to a single circuit board.

All modules of each type are interchangeable and identical for replacement in minutes. The modules are hard-wired to eliminate loose connections caused by vibration. Each module is subjected to rigorous testing to eliminate any inferior components. Modules are calibrated at the factory and require no adjustments in the field. Service and troubleshooting of the system is minimized.

The AC module comprises the electronics for automatic control of the engine generator set:

• Electronic engine governor
• Electronic generator voltage regulator
• Automatic load sharing circuit for parallel operation
• Reverse power, under-frequency,over-frequency, pulse loss and over-voltage protection

The DC module comprises the electronics for automatic control of the SCR converter:

• Automatic load sharing system for the drawworks, rotary table and mud pumps' motors
• SCR firing circuits with ‘hard firing pulse’ output
• Gate suppression at approximately 150% of the highest single motor current limit
• All controls are designed to be ‘fool-proof’
• Individual control of current limits for all drilling functions
• Zero throttle interlock

The power control house provides the features of economic operation maintenance, compactness, and portability. The house contains the SCR or AC drives, generater control cubicles and other associated equipment to include motor control center, drawworks dynamic brake control, transformers, and AC cooling units. The self-supporting power control house is mounted on a three or four runner oilfield skid. Lifting eyes or a drawbar at each end of the house are provided for transportation on a trailer.

• Factory wired and thoroughly tested as a complete system prior to shipment
• Weatherproof AC and DC connectors are located on one end to the house