Abstract: A system for providing backup power to a facility includes a generator and a controller. The controller is configured to operate the generator until a condition is met, determine a load history that occurs while operating the generator until the condition is met, determine a cool-down time based on the determined load history, and run the generator to the point when the condition is met and in an unloaded condition for the cool-down time.

Abstract: A system for providing backup power to a facility includes a generator, and a controller configured to determine whether electrical power to the facility has been interrupted, determine a mode of operation based on a type of occupancy currently within the facility, and if electrical power has been interrupted, then operate the generator based on the determined mode.

Abstract: A system for providing backup power to a facility includes a generator, and a controller configured to determine whether electrical power to the facility has been interrupted, and automatically determine a generator initial start and restart time delay based at least on a prediction of when an electrical system within the facility needs to be cycled.

Abstract: A system for providing backup power to a facility includes a generator, and a controller configured to determine whether electrical power to the facility has been interrupted, determine a mode of operation based on a type of occupancy currently within the facility, and if electrical power has been interrupted, then operate the generator based on the determined mode.

Abstract: A system for providing backup power to a facility includes a generator, and a controller configured to determine whether electrical power to the facility has been interrupted, and automatically determine a generator initial start and restart time delay based at least on a prediction of when an electrical system within the facility needs to be cycled.

Abstract: A system for providing backup power to a facility includes a generator and a controller. The controller is configured to operate the generator until a condition is met, determine a load history that occurs while operating the generator until the condition is met, determine a cool-down time based on the determined load history, and run the generator to the point when the condition is met and in an unloaded condition for the cool-down time.

Abstract: A loss of a power source for a bus is detected. Responsive to detecting the loss of the power source, a voltage is generated on the bus using an uninterruptible power supply (UPS). A generator is transitioned to a desired output state concurrent with generating the voltage on the bus using the UPS. The generator is coupled to the bus responsive to the generator attaining the desired output state. The UPS may be used to provide power to a load connected to the bus while the generator is in transition. For example, detecting the loss of the power source may be preceded by operating a converter of the UPS coupled to the bus as a rectifier and generating the voltage on the bus using the UPS may include operating the converter of the UPS as an inverter.

Abstract: A loss of a power source for a bus is detected. Responsive to detecting the loss of the power source, a voltage is generated on the bus using an uninterruptible power supply (UPS). A generator is transitioned to a desired output state concurrent with generating the voltage on the bus using the UPS. The generator is coupled to the bus responsive to the generator attaining the desired output state. The UPS may be used to provide power to a load connected to the bus while the generator is in transition. For example, detecting the loss of the power source may be preceded by operating a converter of the UPS coupled to the bus as a rectifier and generating the voltage on the bus using the UPS may include operating the converter of the UPS as an inverter.

Abstract: The difference in voltages measured upstream and downstream of a pressure junction in a power distribution system produced by the energizing power is divided by the measured current to calculate a value that is a function of the impedance of the pressure junction, which is monitored for deterioration. To eliminate noise resulting from dividing a small number by a large number and transients in the power distribution system, the impedance is calculated from the squares of the voltage differences and currents for a large number of samples, and the change between successive calculations is limited to produce a stable median value.

Abstract: An electric contactor for the motor of a reciprocating pump such as an oil well walking beam pump, and other cyclic loads, uses the power drawn by the load to determine the phase angle of the pump without the need for a separate phase signalling sensor. The contactor couples the electric pump motor to a power line, and has a power sensor and peak detector. The power sensor can be responsive to RMS AC power or simply to current amplitude and polarity. The motor passes through a minimum power at the extreme top and bottom of a pump stroke, and the phase position at the top of the stroke is preferably detected by sensing for the power reversal that occurs as the momentum of the pump causes regeneration by the motor. The contactor can have overcurrent and/or undervoltage protection features, can include contacts for rearranging the motor windings to vary pump operation, and can report the phase to a pump control and monitoring system, whereby process variables are assessed as a function of phase.

Abstract: The extent to which a reciprocating pump for an oil well fills between successive pump strokes is determined indirectly from variations in the power consumption of an electric motor driving the pump. The power consumption is sampled numerically and a processor determines the phase of data in the samples from phase references defined by a peak and/or zero crossing in the cyclic operation of the pump and motor. When the pump fills incompletely between strokes, for example when the pump is operated at too high a frequency, the well rod moves against decreased resistance during the downstroke. The processor determines the point in the pump cycle at which the well rod encounters fluid from the increased power consumption, obtaining an indirect indication of fillage.

Abstract: A pump controller coupling the electric motor of a cyclically operating well pump to a power line is arranged to measure instantaneous power consumption of the motor, to integrate the power consumption over pump cycles, and to assess the performance of the well and/or pump by using the total power consumption to estimate fluid flow. The controller determines a phase reference in the cycle of the pump by monitoring for a peak or zero crossing in the instantaneous power level, specifically the point at which the pump changes over from a power stroke to regenerative operation due to pump momentum. The integrated total power consumption is reduced by an offset factor representing frictional losses, and scaled to obtain an approximate fluid volume determination for the pump and well. The factors used for offset and scaling can be adjusted by calibration using at least intermittent measurements of actual fluid flow and fluid density.