This test is to ensure that capacitors do not ignite at a defined electrical overload. Capacitors are applied the rated voltage at 50 Hz with 20 superimposed pulses of 2.5 kV for class X2 and 5 kV for class Y2. The rated voltage is maintained for 2 min. after the last discharge.
Capacitors are tested with a voltage of 1.25 times the rated voltage for class X2 and 1.7 times for class Y2 at the upper category temperature for 1000 h. Each hour the test voltage is increased to 1000 VRMS, 50 Hz for a period of 0.1 s. This test is to ensure that capacitors do not ignite at a defined electrical overload.
Test between terminals and case shall be carries out only for qualification approval test. For testing period of 1 s the voltage of the following table shall be multiplied by 1.25. Attention is drawn to the fact that repetition of the voltage proof test by the user may damage the capacitor.
Each capacitor except those of sub-classes X3 and Y3 is tested with the surge voltage (Vp) as shown in the above table. Capacitors are tested with a voltage of 1.25 times the rated voltage for class X2 and 1.7 times for class Y2 at the upper category temperature for 1000 h.
Capacitors are applied the rated voltage at 50 Hz with 20 superimposed pulses of 2.5 kV for class X2 and 5 kV for class Y2. The rated voltage is maintained for 2 min. after the last discharge. This is a destructive test, and the failure condition is that cheesecloth around the capacitor shall not burn with a flame.
The endurance of a Ferroelectric Hafnium Zirconium Oxide Thin Film Capacitor is measured by applying a cyclic voltage pulse with an amplitude above the coercive field across the capacitor and recording the resultant polarization response periodically throughout the cycling process.