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.
Experience shows that the effectiveness of the DWV test to reveal capacitors with defects is low; however, a comparative analysis of distributions of VBR before and after stress testing can reveal the presence of defective parts. 3/ In addition to C, DF, and IR measurements, VBR is measured using a technique as in Gr.1.
Where the capacitor bank consists of several capacitor mounting frames insulated from each other, then the insulation resistance from each frame to the HV terminals of the capacitors mounted in that frame shall be tested. All of the capacitor terminals (where not connected to the support frame) should be shorted together for this test.
At these parameters of the model the acceleration factors are large, and a 96-hour testing of capacitors at 2 times rated voltage (VR) and 125 °C during voltage conditioning (a typical screening procedure) would be equivalent to testing at operating conditions (assumed 50 °C and 0.5 VR) to more than a thousand years of operation (see Figure 1).
The accuracy of voltage measurements should be 1 mV or better. The resistors will have a value of 100 kOhm for capacitors less than 1 μF and 10 kOhm for capacitors of 1 μF or larger.
AC Voltage test shall be applied between the conductor and the metallic shield (for 11KV cables 23KV for 5 minutes) at ambient temperature. 3. The measurement shall be made between conductor and the cores & metallic shield. 4. The test voltage shall be applied between each conductor and the metallic shield.
P1861/D5.2, April 2014
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