Hi Boštjan:
A Y2 capacitor is rated 250 V a.c., 5 kV peak
impulse. According to IEC 60384-14, rated voltage
is "either the r.m.s. operating voltage of rated
frequency, or the d.c. operating voltage, which
may be applied continuously to the terminations of
a capacitor." Impulse voltage is "aperiodic
transient voltage of a defined waveform."
800 V d.c. exceeds the Y2 rating. You can expect
failure of the capacitor - maybe not immediately -
with possibly explosive results.
I would look for a capacitor (you won't find a
suitable Y capacitor as Y-caps have a maximum
rating of 250 V) rated for the a.c. voltage, d.c.
voltage, and impulse voltage. I would guess that
you could get such a cap from some Y-cap
suppliers. Your client probably needs to ask them
to design and build the caps according to the use
specs.
Best regards,
Rich
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