Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

wye connection

See Y connection
wye-connection
a three phase source or load connected in the form of Y.
Y connection
a three-phase source or load which is connected such that the elements are connected in parallel and are thus represented in a schematic diagram in a Y or star-shaped configuration.
zero-sequence reactance
the reactive component of the zero sequence impedance.
See symmetrical component
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.
rectifier
a circuit that changes an AC voltage to DC. Switching elements or diodes are used to create the DC voltage. Diode rectifiers
and thyristor rectifiers are the two most commonly used rectifiers.
Motor service factor (SF)

The percentage multiplier that a motor can handle for short periods of time when operating within its normal voltage and frequency tolerance. In other words, it is a fudge factor that give extra horsepower when it's occasionally needed.

FACTS

Flexible Alternating Current Transmission System


See Flexible Alternating Current Transmission System
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