Eliminating harmonics from the facility power …

power system anomalies that peri-odically occur in a facility s elec-trical system can cause equipmentmalfunction, data distortion, transformerand motor insulation failure, overheatingof neutral buses, nusiance tripping of cir-cuit breakers, and solid-state componentbreakdown. The cost of power qualityproblems can be enormous. Equipmentreplacement can cost tens of thousandsof dollars. Downtime, however, can runin the millions of dollars. power quality problems take manyforms. Voltage sags, transients, and spikesare probably the most understood of theseforms. Harmonic distortion, though, canoccur from adjustable-frequency drivesand other non-sinusoidal loads typicallywhere ac/dc conversion is present. In any facility , the voltage supplied by apower system is generally not a pure sinewave. Rather, it usually possesses someamount of distortion, which has a funda-mental frequency and harmonics at thatfrequency, (see box, Harmonic basics ). Distortion comes from various sources,particularly equipment with power -cir-cuitry devices that draw current in a non-linear fashion.

P ower system anomalies that peri-odically occur in a facility’s elec-trical system can cause equipment malfunction, data distortion, transformer

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