FAQs
Guide To Using GDHY Capacitors
Choosing the Best Capacitor for Your Needs
When choosing a capacitor for an application, select a capacitor with maximum rated voltage RMS, current and reactive power that most closely matches the highest operating voltage and frequency of the application. Take into account any ripple and any DC bias that can occur during operation, as even momentarily over voltage damages the capacitor and reduces its life time. The maximum ratings appear clearly on the data sheet of each capacitor.
The reactive power formula is:
Qc= V2rms x C x 2πf x 10-6
where
Qc is reactive power in kVAr
Vrms is RMS voltage in volts
C is capacitance in µF
f is frequency in kHz
What are the physical tolerances of a capacitor?
The maximum deviation in length, width and height is normally 1mm.
What is the capacitance tolerance of GDHY capacitors?
Capacitance might vary to a maximum deviation of 10%. Other tolerances are available upon request.
Do GDHY capacitors comply with the Restriction of Hazardous Substances Directive (RoHS)?
Most of GDHY capacitors comply with the RoHS (including all the new models).
I currently use the GDHY C52 1.5µF 400VDC capacitor, but can no longer find it in your catalogue. Why was this product’s specification changed?
The capacitor has not been changed in any way. We have simply adjusted the specified capacitance values to reflect the actual measured average value.
What is the lifetime of GDHY capacitors?
GDHY capacitors are built to work continuously (24/7) for more than 100,000 hours.
Can you help me to select a capacitor?
Yes! GDHY’s experienced team is ready to help you to choose a capacitor which best meets your requirements. You can send your inquiry here and we will get back to you soon with our recommendations.
Why does the allowed voltage decrease at high frequencies? Why is it limited at low frequencies?
Why does the allowed voltage decrease at high frequencies? Why is it limited at low frequencies?
Why does the allowed current decrease at low frequencies? Why is it limited at high frequencies?
Current at low frequencies is determined by current limitations, since I = Vmax·(2πfc).
The current has a maximum level Imax, which is the highest value that enables safe operation .
The current has a maximum level Imax, which is the highest value that enables safe operation .
Why does the allowed reactive power decrease at low or high frequencies? Why is it limited in between?
The reactive power is derated at low frequencies because of current decline, and at high frequencies because of voltage decline.
The reactive power has a maximum level Qcmax, which is the highest value that enables safe operation.
The reactive power has a maximum level Qcmax, which is the highest value that enables safe operation.
What are the losses/tanδ of GDHY capacitors?
Capacitor bank losses consist of two elements: capacitor losses and connection losses. Each represents about 0.05% of the reactive power.The total losses of a capacitor bank is their sum, about 0.1% of the reactive power.
Can you help me to design a capacitor bank?
Yes! GDHY’s experienced team is ready to help you design your application. Please send your inquiry and we will get back to you shortly.
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