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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.
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.
In making this evaluation, consideration must be given to the sensitivity of capacitor bank protection (such as unbalance protection) and the potential for a capacitor under test to inadvertently discharge stored energy into a protection system. In most cases secondary isolation of the protection system will be required.
Withstand voltage testers must be able to apply the test voltages described in the standard and to measure the breaking current. They are also subject to requirements such as the following as imposed by standards and laws: • The voltmeter precision must be JIS Class 1.5 or greater.
Voltage withstand testing is done with a high- voltage source and voltage and current meters. A single instrument called a "pressure test set" or "hipot tester" is often used to perform this test. It applies the necessary voltages to a device and monitors leakage current. The current can trip a fault indicator.
5.2 Typical voltage and reactive power (kvar) ratings for capacitor units. A brief description of the nominal ratings (i.e. kvar, voltage, capacitance) that are typical of the low-voltage AC power capacitors of concern.
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Live ChatA capacitor shall withstand a DC Test voltage applied for 10 seconds between the primary terminals. The voltage level to be applied is: U test = U n x 4.3 x 0.75 Where U test = applied ...
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