Harmonics are multiples of a fundamental frequency. For example, in a 60 Hz system, the 5th harmonic is 300 Hz. The total amount of harmonics in a power system is referred to as Total Harmonic Distortion (THD).

Harmonics are caused by non-linear load devices such as variable frequency drives, AC to DC converters, and UPS systems. Harmonics when present in a power system, often result in higher voltages and currents. This condition is known as poor power quality.

Poor power quality may lead to failed power factor correction capacitors, blown fuses, tripped circuit breakers, and failure of electronic equipment. Most damaging is the additional heat generated in transformers, where an increase in operating temperature can significantly reduce the life of transformers, motors, and capacitors.

The application of harmonic filters provides solutions to a variety of power quality issues. These issues include power factor correction in the presence of non-linear loads, harmonic mitigation, and compliance to IEEE standards. Filters must be properly engineered and applied to prevent unexpected interactions within an electrical system.

For more detailed information on harmonics, view our Application Guide for Solving Harmonic Problems.

Myron Zucker, Inc. offers both fixed, automatic, and active harmonic filters designed to correct poor power factor and eliminate or reduce the damaging levels of harmonics present in an electrical system.

HARMONIC FILTERS - FIXED

• Caltrap^® series: Designed to treat individual motors or drives
• Capacitrap^® series: Designed to treat system harmonics at the service entrance or distribution center under constant load conditions

HARMONIC FILTERS - AUTOMATIC

• Autocapacitrap™ series: Designed to treat system harmonics under varying load conditions
• ZT Capacitrap series: Designed to treat system harmonics under rapidly changing load conditions. The ZT series utilizes thyristor soft-switching technology which prevents transients.

HARMONIC FILTERS - ACTIVE

• Digital Power Manager series: Designed to instantly react to and correct a wide range of harmonic conditions using inverter technology

HARMONIC FILTER BENEFITS:

• Mitigate harmonic distortion and improve power factor
• Comply with industry standards including IEEE 519
• Extend life of equipment
• Reduce downtime while improving power quality