Definitions

Harmonics: AC voltages and currents with frequencies that are integer multiples of a fundamental frequency. (Fehr)

Transient: a change in the steady-state condition of voltage, current, or both (Turkel)

Voltage Sag: more than a 10% decrease below the normal rated line voltage lasting anywhere from a .5 cycles, up to 1 min in duration. (Turkel)

Voltage swell: more than a 10% increase above the normal line voltage lasting anywhere from .5 cycles up to 1 min in duration. (Turkel)

Bibliography

R. Fehr, P.E. “Harmonics Made Simple” EC&M Jan 1, 2004

Alan R. Chiste “Surge Protection Selection” EC&M Aug 1, 2002

Farlex, Inc. Nov. 23, 2005 : http://www.thefreedictionary.com/joule

Phillip Giddings “Audio Systems Design and Installation” Focal Press 1990 pg.47

Ray Waggoner “Specifying Power Conditioning Equipment” EC&M Apr 1, 1995

Ray Waggoner “The how, what, and where of power conditioning” EC&M Oct 1, 1996

Stan Turkel “Don’t let Surges and Sags Get you Down” EC&M Nov 1, 2000

Stan Turkel “In Search of Transients” EC&M Oct 1, 2000