AnalysisoftheExcessivePartialDischargeatValveSide of
AC withstand voltage test and partial discharge test. Based on the field capacitor core is made according to the principle of capacitance and resistance voltage. The exterior is which rules
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This information should be printed on the outside of the capacitor as well. The voltage rating indicates the maximum voltage that the capacitor can withstand without being damaged. You should never apply a
6 Frequently Asked Questions about “Capacitor Withstand Voltage Test Rules”
How do you test a capacitor?
A capacitor shall withstand a DC Test voltage applied for 10 seconds between the primary terminals. The voltage level to be applied is: Utest = Un x 4.3 x 0.75 Where Utest = applied test voltage. Un = capacitor rated voltage. Note a 75% derating factor has been applied since this test is a repeat test after delivery.
What are the rules for custom capacitors?
Different rules may apply for customized capacitors. The surge voltage is the maximum voltage which may be applied to the capacitor for short periods of time, i.e. up to 5 times for 1 minute each per hour. Surge voltage testing is conducted according to IEC 60384-4.
Can a 12 kV capacitor withstand a voltage test?
The capacitor shall also withstand a 1 minute power frequency withstand test of a test voltage applied between the capacitor terminals and earth. For 12 kV rated capacitors, the test voltage is 75% of 28 kV. Refer to IEC 60871 or AS 2897 for other ratings. The requirements of the test are satisfied if no disruptive discharge occurs.
How is rated voltage applied to a capacitor?
For this purpose, the rated voltage is applied to the capacitors via a series resistance of approxi-mately 100 for VR 100 V DC, or 1000 for VR >100 V DC, for a period of one hour. Subsequently, the capacitors are stored under no-voltage conditions for 12 to 48 hours at a tem-perature between 15 and 35 °C.
Can a capacitor fail a dielectric test?
current flow is not caused by insulation failure. In fact the capacitor is operating as intended, although the excessive current flow from attempting an AC dielectric test is likely to damage the capacitor. The solution is to test with a DC test voltage, at a test potential equal to the peak of
Can a capacitor be operated continuously?
The capacitors listed in the databook can be operated continuously at the full rated voltage (includ-ing superimposed AC voltage) within the entire operating temperature range. The permissible voltage range for continuous operation lies between the rated voltage and 0 V.