EnerTec - Power Factor Correction

Cylindrical Capacitors

FRAKO Power Factor Correction Capacitors are components with very high power density. 15 kVar reactive power can be housed in 1000 cm². This is achieved by a very low loss factor and high utilization of dielectric. However, in order to attain a high life expectancy, partial discharges (these are negligible electrical discharges inside the dielectric) must be suppressed. This is achieved by using a flame inhibiting mineral filler.

Technical Remarks: For the operation of power capacitors three aspects are of utmost
importance.

• high overload.
• long life expectancy.
• safe reaction at overload and during possible breakdowns.

Current Load Capacity: In networks polluted with harmonics you can expect over voltagesand in particular a higher RMS current load when resonances occur.
if, for example, approx. 7% of the 11th harmonic occurs, then the voltage is 7% higher; the actual value of the capacitor current, however, is 1.33 times the rated current. Forthis reason a high current load capacity is even more important then the voltage load capacity. At 400 VAC mains voltage FRAKO uses only power capacitor rated at 440 VAC. their permissible current load capacity is:

• 2 times the rated current at 400 VAC / 50 Hz permanently.
• 350 times the rated current at 400 VAC / 50 Hz during short peak currents.
• safe reaction at overload and during possible breakdowns.

Life Expectancy: Extreme purity of the material used prevent a deterioration of the loss factor and thereby a reduction of the dielectric strength and the current load capacity. The very low number of failures in the field prove an exceptional high life expectancy. Field reports received over the last 10 years point to a failure rate of less than 1% in 15years of operation.

Safety Features: FRAKO Power Capacitors offer the highest safety with an overload disconnector, which activates at internal overpressure, disconnects the capacitor from the mains and thereby prevents capacitor destruction. FRAKO carriers out the tests and regular random tests to monitor the production safety of this function. The test conditions comply with IEC 831 standards. FRAKO Power Capacitors offer, therefore, the highest possible standard of safe at overload and at the end of their life time.

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