Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

voltage interruption
the removal of the supply voltage from any phase, which is of momentary, sustained, of temporary duration.
voltage protection
the output voltage is limited to protect the load from an overvoltage condition. This can be accomplished by shunting the power-supply output or shutting down the drive circuit for the active switches in a switching supply if the output voltage exceeds a preset value.
voltage spread
the difference between a power system's specified maximum and minimum voltages.
wind power generator
a system that utilizes the energy in the wind to generate electricity. The energy in the wind drives a wind turbine which acts as the prime mover for the generator. A wind turbine operates at a variable speed, and an appropriate electric machine and controller converts the mechanical energy into electrical energy and pumps it into a utility grid.
wiped joint
a fused joint used in splicing lead-sheathed cables.
wraps
pre-formed wire grips or ties for mechanically joining overhead conductors to insulators.
written-pole motor
a single-phase motor that uses a coil to write poles on the magnetic rotor. The advantage of the written-pole motor is that it draws much lower starting current, allowing much larger single-phase motors. The development of this motor has been sponsored by the Electric Power Research Institute.
X-ray lithography
lithography using light of a wavelength in the range of about 0.1 to 5 nm, with about 1 nm being the most common, usually taking the form of proximity printing.
zone of protection
the area of a power system for which a particular set of protective relays has primary protection responsibility. In typical cases, operation of any of these relays will open circuit breakers which will isolate this zone. Each major power system component (line, transformer, bus, generator) has a separate zone of protection.
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