2,000m – 9,000m electrical control system for AC variable frequency transmission consists of the digital, ABB/Siemens AC variable frequency driver, the auto driller system based on the PID technology, the stable Siemens PLC control technology, the GCS/GDK MCC control cabinet, the integrated monitoring system, the integrated operation interface, the remote diagnosis system, the standard house design, the human-friendly cooling air channel and digital/analog generator control system. The whole system is stable and reliable.
Features:
Dynamic brake technology, with high control precision         
Single joy-stick operation, free direction changeover of drawworks and hovering facilitate drillers’ operation    
Intelligent anti-bump technology, constant pressure difference auto-rig123.net' target='_blank'>drilling technology, soft-pump function of the mud pump and protection of pumping pressure.      
Soft-torque of rotary table and torque slow release function for rotary table   
 Integrated monitoring system and remote diagnosis system, Redundancy design improve the system reliability.


Figure 1.1 VFD house layout

VFD house mainly contains:
u  4 generator cabinets and 1 synchronizing cabinet
    Function: they are used for paralleling and controlling 4 diesel generators and supply 600V/50Hz AC power to the system. A Schneider MT breaker is mounted in synchronizing cabinet, and it is used for supplying AC 600V/50Hz power to top drive.
u  3 SIEMENS rectifying systems
    Function: they are used for rectifying AC 600V current to 840V DC power and supply DC power to inverting cabinet.
u  6 SIEMENS inverting equipments
    Function: 2 drawworks (DW) inverting equipments, 3 mud pump (MP) inverting equipments and 1 rotary table (RT) inverting equipment supply power for AC viable frequency motors.
u  2 SIEMENS brake cabinets and relevant resistors
    Function: they build up brake control of surplus energy consumption and surplus energy consumption unit. They are used for exhausting feedback energy from inverting equipments on DC bus.
u  1 PLC cabinet
    Function: 2 independent S7-300 control systems are mounted in the cabinet. By gathering digital data and analog data, via CPU logic calculation, they can fulfill integrated control of the whole system. A-B touch screen is mounted on door of the cabinet, and real-time drilling parameter can be attained by different interface, as well as data recording can be looked up.
u  1 switch cabinet (Switch cabinet)
    Function: 3 MT switch is mounted in the cabinet. one is used for supplying AC 600V power to T1 transformer. Besides, the second one is used for T1 transformer output; The third one is used for auxiliary generator.
u  1 auto-bit cabinet and relevant resistor
    Function: it is equipped a Siemens S120 single transmission converter, and it used for supply power for auto-bit motor; The brake resistor is used for exhausting feedback energy when auto-bit motor is lowering traveling block. This equipment is designed for providing constant drilling speed and drilling pressure for shallow formation, formation with unstable well pressure and formation required low drilling speed.
u  4 MCC cabinet
    Function: it is used for supplying 400VAC dynamic power to blowers, oil pumps of DW, RT, MP and mud tank etc.
u  1 high-power air conditioner
    Function: the system applies 1 Trane cooling air conditioner to adjust indoor temperature of VFD house.
u  4 MCC cabinets
    Function: they are used for supplying power to AC motors of drilling floor, MUD PUMP house, MUD tank area, oil tank area, generator house and water tank area etc.
u  1 lighting cabinet
    Function: plastic breakers are mounted in lighting cabinet, and it supplies 400V power to system and 220VAC lighting power and supplies 220VAC/24VDC power to driving part. Siemens touch screen is installed too.
u  1 transformers
    Function: T1 transformer (600VAC/400VAC, 1250KVA) supplies 400VAC power to the whole drilling field.
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