85A RMS rating enhances harmonic filter capacitors
The newly enhanced Cornell Dubilier PC Series of AC Harmonic Filter Capacitors is in stock at New Yorker Electronics. The capabilities of the series have been extended to include an 85 Ampere RMS rating and many other enhancements. Type PC capacitors are designed to meet the demands of filter applications rich in system total harmonic distortion (THD).
This series has a dual protection system utilising self-healing metallised polypropylene and a mechanical pressure interrupter to ensure a safe open circuit mode in the event of overload or end of life.
Series improvements include its UL recognised construction and internal pressure interrupter system.
This internal system has passed rigorous UL testing to ensure fail-open performance under high current fault conditions.
The higher current ratings improve the capacitor’s ability to handle the high levels of harmonic content encountered in inverter AC input and output filtering applications.
The series is typically networked with inductors to filter out undesirable harmonics in both single-phase and three-phase AC power systems.
As a two-terminal capacitor device, multiple PC series filter capacitors can be connected in delta or wye configurationsto achieve the reactive power and harmonic tuning needed to filter out the unwanted frequencies.
The presence of multiple harmonics puts additional stress on capacitors in the form of self-heating. The CDE PC series is designed with robust terminations and low equivalent series resistance (ESR), to minimise heating.
The service life objective of the PC series is 60,000 hours when operated at full rated voltage and a case hot spot of 70°C.
The PC series is offered with capacitance ratings ranging from 20µF to 125µF at voltage ratings from 300Vac to 700Vac.
Case diameters vary from 63.5 to up to 116mm. Custom capacitance and voltage ratings, sizes and performance characteristics are also available.
Specific application conditions, especially harmonic content profiles, are needed to properly size the capacitors for peak performance.
The PC series enhancements add capabilities to the broad range of AC harmonic filtering solutions offered by New Yorker Electronics.
These include three-phase cylindrical and welded rectangular cases used in large inverter systems.
In addition, Cornell Dubilier manufactures rack-mount systems, designed and fabricated in-house, to allow for easy integration of capacitor banks into the mechanical design of a filter system.
Features include line conditioning, variable speed drives, extruded aluminum with steel or aluminum cover, noise suppression. The capacitors are RoHS compliant.
Applications are uninterruptable power supplies (UPS), AC Tuned filters (harmonic reduction), AC Input filtering and wind turbine motoring.