Abstract: A system and method are disclosed for building a modular electrical system for a jack up rig, the method including but not limited to identifying rig equipment on the jack up rig that will be connected to the modular electrical system; selecting electrical equipment to control the rig equipment; placing the electrical equipment in an electrical module; and electrically connecting the electrical equipment to power cables and control cables inside of the electrical module; and testing the electrical equipment inside of the electrical module.

Abstract: A method is disclosed including but not limited to supplying a voltage waveform from a higher power electrical bus to a lower power electrical bus; sensing on the lower power electrical bus, a deviation from a sinusoidal voltage waveform in the voltage waveform supplied from the higher power electrical bus; generating a correction current to adjust the deviation in the voltage on the lower power bus to a substantially sinusoidal voltage waveform; and filtering the correction current to substantially attenuate the correction current from propagating through the filter from the lower power electrical bus to the higher power electrical bus. A system is disclosed for performing the method.

Abstract: A variable resistance door stay apparatus is disclosed. The door stay is provided with an adjustable tightening nut that slides inside a longitudinal slot in a ridged member. A method is disclosed for proving variable resistance to rotational of a door.

Abstract: A hybrid cooling system is disclosed including but not limited to an array of solar cells electrically connected to inverters for producing electricity from the sun; a chiller controller processor in data communication with the inverters and a non-transitory computer readable medium; a chiller in data communication with the chiller controller processor and in thermal communication with inverters in a sealed enclosure, wherein the inverters are cooled by an inverter coolant fluid; an array of solar cells attached to the inverters for producing power from the sun; a free cooler in data communication with the chiller controller processor and in thermal communication with the inverter cooling fluid; and a temperature sensor apparatus in thermal communication with the inverter cooling fluid; a switch for controlling an on off state for the chiller and the cooler, where in the processor for turns the chiller on and the cooler off when the inverter cooling fluid is above a predetermined temperature.

Abstract: A hybrid winch system for use with an anchor handling vessel comprises an electric winch mountable on the anchor handling vessel, an electric generator for providing generated power to the electric winch, a battery for providing stored power to the electric winch, an anchor cable wound around the electric winch and passing over a roller drum for guiding the anchor cable, an anchor attached to a distal end of the anchor cable and a winch controller for selectively applying the generated power and the stored power to the electric winch. The winch controller is configured to provide the stored power to the electric winch for controlled release of the anchor cable in case of loss of the generated power.

Abstract: A method and apparatus are disclosed for retrofitting a pedestal crane, the method comprising removing an existing motor generator controller for a motor in the pedestal crane; and replacing the motor generator controller with a digital controller.

Abstract: A method and apparatus are disclosed for lowering a load on a direct current hoist motor during an electrical power interruption, the method including but not limited to determining in a crane processor that the electrical power interruption has occurred; and providing a brake assist current to shunt field on the direct current hoist motor to produce a counter torque in the hoist motor.

Abstract: A method for pumping water on a naval vessel is disclosed, the method including but not limited to pumping fresh water from a fresh water reservoir into a fresh water flush tank; pumping salt water from a salt water reservoir into a a fire water reservoir during fire operations; controlling a valve in liquid communication to alternately connect the fire water reservoir to the salt water reservoir to supply salt water to the fire water reservoir during fire operations and connecting the fire water reservoir to the fresh water flush to flush salt water from the fire water reservoir after fire water operations. A system is disclosed for practicing the method.

Abstract: A method is disclosed including but not limited to supplying a voltage waveform from a higher power electrical bus to a lower power electrical bus; sensing on the lower power electrical bus, a deviation from a sinusoidal voltage waveform in the voltage waveform supplied from the higher power electrical bus; generating a correction current to adjust the deviation in the voltage on the lower power bus to a substantially sinusoidal voltage waveform; and filtering the correction current to substantially attenuate the correction current from propagating through the filter from the lower power electrical bus to the higher power electrical bus. A system is disclosed for performing the method.