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Commonly used terms in the Electrical industry.
instantaneous power
power in an AC or modulated signal at a given instant in time.
integral horsepower motor
a motor built in a frame as large as or larger than that of a motor of open construction having a continuous rating of one horsepower at 1700-1800 rpm.
maximum transducer power gain
maximum value of transducer power gain a circuit or device exhibits; occurs when the input and output ports of the circuit are terminated with simultaneous conjugate match conditions. The transducer power gain is defined as the ratio of power delivered to a load to the power available from the source.
nuclear power plant
a thermal electric power plant in which the heat for steam turbines is produced by nuclear fission.
output power
(1) the difference in the power available under perfectly matched conditions and the reflected power taking the output return loss into account, expressed in watts.
(2) in lasers, the useful output from a laser oscillator.
power
(1) a measurable quantity that is the time rate of increase or decrease in energy. Units are in watts.
(2) ratio of energy transferred from one form to another (i.e., heat, radio waves, light, etc.) to the time required for the transfer, expressed in watts.
power angle
the angular displacement of the rotor from the stator rotating magnetic field while the machine is on load. The power angle is also the angle between the terminal voltage Vt of a synchronous machine and the generated voltage Eg or Em, respectively, for a generator or motor. This angle denoted by δ is also referenced as power angle or torque angle or the load angle in a synchronous machine. It signifies the limits of the machine to remain in synchronism.
See
torque angle
power angle curve
a curve shown the relationship between the active power output of a generator and its power angle.
power conditioner
a device designed to suppress some or all electrical disturbances including overvoltages, undervoltages, voltage spikes, harmonics, and electromagnetic interference (EMI). Example power conditioners are active filters for the reduction of harmonics, metal-oxide varistors (MOVs) and isolation transformers for the protection against voltage spikes, and EMI filters.
power disturbance
a variation of the nominal value of the voltage or current.
power divider
passive electronic circuit consisting of one input and two or more outputs. A signal applied to the input is divided into equiphase output signals, generally of equal amplitude.
power factor
in an AC system, the ratio of the (active component) real power P to the apparent power S; it is given by the cosine of the angle subtended by S on the real, P axis. See also apparent power, real power, reactive power.
power factor correction
the addition of reactive load to bring the combined power factor nearer unity. Since most industrial loads are inductive, capacitors are often employed as passive devices for power factor correction.
power fault arc
an arc through soil extending from a power lines's lightning ground to a buried, grounded structure. These may form when lightning strikes an energized overhead electric power line.
power flow studies
solutions of transmission line active and reactive power flow and bus voltages giving system load.
power flow study
the circuit solution of an electric power system which yields the voltage of each bus and thus the power flows throughout the system.
power follow
a fault condition, especially through a lightning arrester, in which power line current flows along a path through air or other insulation broken down by a high voltage impulse such as a lightning stroke to a conductor. See power fault arc.
power follow transformer
a rugged, high-current power transformer used in tests of lightning arresters to test the arrester's power follow arc suppression capability.
power flux density
a vector that gives both the magnitude and direction of an electromagnetic field's power flow. The units are watts per square meter.
power fuse
a protective device that consists of a fusible element and an arc quenching medium. An overload or fault current in the fuse melts the fusible element, which creates an arc. The quenching medium then interrupts the current at a current zero, and prevents the arc from restriking.