CD Expands Capabilities In High Current Harmonic Filter Capacitors

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  • New Yorker Electronics has released an enhanced Cornell Dubilier(CD) PC series of AC harmonic filter capacitors
  • Cornell Dubilier has extended the capabilities of the series by upgrading the RMS rating of the capacitors up to 85 A

The Effects of Harmonics on Capacitors include additional heating – and in severe cases overloading, increased dielectric or voltage stress, and unwanted losses. Also, the combination of harmonics and capacitors in a system could lead to a more severe power quality condition called harmonic resonance, which has the potential for extensive damage. Consequently, these negative effects will shorten capacitor life.

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. It utilizes a self-healing metallized polypropylene. It also has a mechanical pressure interrupter. This ensures a safe open circuit mode in the event of overload or end of life.

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Runs an internal pressure interrupter system

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New Yorker Electronics has released an enhanced Cornell Dubilier(CD) PC series of AC harmonic filter capacitorsAccording to the company, the capacitors have been upgraded with series improvements. It includes the UL-recognized construction and internal pressure interrupter system. This internal system passes rigorous UL testing. This testing ensures 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. These harmonics are encountered in inverter AC input and output filtering applications.

Can connect in delta or wye configurations

The series is typically networked with inductors. These inductors are used to filter out undesirable harmonics in both single-phase and three-phase AC power systems. A capacitor is a two-terminal capacitor device. Multiple PC series filter capacitors can be connected in delta or wye configurations. These configurations can achieve the reactive power and harmonic tuning needed to filter out the unwanted frequencies.

Minimises hating of capacitors

The presence of multiple harmonics puts additional stress on capacitors. This load dissipates in the form of self-heating. The CDE PC series is designed with robust terminations and low equivalent series resistance (ESR). This minimises heating of the capacitor. The service life objective of the PC series is up to 60,000 hours. It is the service life when the capacitor is operated at full rated voltage and a case hot spot of up to 70° C.

Capacitor customisations available

The PC series is offered with capacitance ratings ranging from 20 µF up to 125 µF. The voltage ratings for the device varies from 300 V AC to 700 V AC. Case diameters for the capacitor vary from 63.5 up to 116 mm. The company also features custom capacitance and voltage ratings, sizes and performance characteristics. To attain the peak performance of a capacitor, specific application conditions like the harmonic content profiles, are needed to be calculated according to the requirement.

Also available in rack-mount systems

The PC series enhancements add capabilities to the broad range of AC harmonic filtering solutions offered by New Yorker Electronics. These series include three-phase cylindrical and welded rectangular cases. These cases are used in large inverter systems. In addition to this, Cornell Dubilier(CD) manufactures also manufactures rack-mount systems. These systems are in-house fabrications by CD. It allows easy integration of capacitor banks into the mechanical design of a filter system.

The applications areas of these capacitors include uninterruptible power supplies (UPS), AC tuned filters (harmonic reduction), AC input filtering and wind turbine monitoring.

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