How to select power factor correction capacitors?

Which technical parameters do purchasers need to offer when they want to purchase power factor correction capacitors?

1.Voltage Rating
Capacitors are designed for use at a specific operating voltage. Using appropriately rated capacitors ensures optimal kVAR output and long life.
The basic rule to be used is that the applied voltage should be equal to the voltage rating of the capacitor. If the applied voltage is lesser than the rated voltage, the kVAR output is lower and of the applied voltage is higher than the rated voltage the capacitor is at risk of damage.

2.Current Rating
During standard operation in the electric power system, capacitors are subjected to over currents as well.
Hence, the standard requires that capacitors be able to carry 135% of the rated nominal current.
YIDEK capacitors carry between 1.5 – 3.0 times the rated current depending on the type selected.

3.System Frequency
Like voltage, capacitors are rated to operate at a specific frequency. If the system input frequency is above the rated frequency and the system voltage is in excess of the rated capacitor voltage, the capacitor is liable to be damaged.

4.Ambient / Operating Temperature
Using the device in operating temperatures higher than its operating range can cause the capacitor to heat up and cause premature degradation or failure of the internal electrical conducting material.

Harmonics are generated by non-linear loads and adversely affect the integrity of the capacitors used.
In cases where large harmonics are anticipated, detuned reactors should be used in series with the capacitors to protect against ill effects and prevent resonance.


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Post time: Aug-02-2019