In message <fe454ecafb4cfe4a89dd78f78ef9e38f899...@ser-ex01.siq.si>,
dated Mon, 10 Nov 2014, =?iso-8859-2?Q?Bo=B9tjan_Glavi=E8?=
<bostjan.gla...@siq.si> writes:
I have one question. One of our clients is generating high voltage DC
bus out of primary circuit without the insulation. This 800VDC circuit
is therefore considered as part of primary circuit. They are using Y2
capacitor between this DC voltage and PE (accross basic insulation).
Measured working voltage accross the capacitor was 800VDC (worse case).
Y2 capacitor has only rating for AC voltage (250V). They could not find
any Y capacitor with DC voltage. Do you see any issue with such construction?
Of course: the Y2 capacitor is being used a long way outside its
ratings. It may stand 800 V DC for a while, but only for a while. It may
burn up.
I think they should look very carefully to see if it is necessary to
have a capacitor from the 800 V DC to PE.
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
Quid faciamus nisi sit?
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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