Thursday, March 19, 2009

Letter Su

Step-up Transformer
A transformer with fewer turns of wire in its primary coil than
in its secondary coil. The step-up transformer is used to step up
the primary voltage to a higher secondary voltage.

Surge
An increase of at least ten percent in current and voltage that
typically lasts only a few microseconds.

Surge Protection Device (SPD)
A device designed to provide a degree of protection for
electrical equipment from the damaging effects of a surge. This
term applies to both secondary surge arresters and transient
voltage surge suppressors.

Switchboard
A large panel or assembly of panels containing switches,
overcurrent protective devices, buses, and associated
instruments. Unlike panelboards, switchboards sometimes
must be mounted away from a wall to allow access to rearmounted
equipment.

Switchgear
A coordinated design consisting of switching and interrupting
devices and associated equipment such as control and
protective devices and metering.

Synchronous Speed

The speed of the rotating magnetic field in a three-phase motor.
Synchronous speed is determined by the line frequency and the
number of motor poles.

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