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[pdf] VFD House: This is the main electrical room on the rig. It supplies power to all rig equipment and contains the PLC (Programmable Logic Controller), VFDs (Variable Frequency Drives) for all motors, and generator control cubicles. It is the central hub where equipment control takes place. 2.
[pdf] The Well Control System or the Blowout Prevention System on a drilling rig is the system that prevents the uncontrolled, catastrophic release of high-pressure fluids (oil, gas, or salt water) from subsurface formations. These uncontrolled releases of formation fluids are referred to as Blowouts.
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