Interesting old suppressor plug.
Added 2018-03-20 19:08:30 +0000 UTChttps://www.youtube.com/watch?v=O42m1BlWc-M
The most interesting thing about this unit is that it is quite well made with a combination of classic filtering techniques.
What do you think of the use of three starred MOVs between Live, Neutral and Earth?
Comments
I ran into a similar issue when I got a used APC Smart UPS 1000 for my PC. With my previous Belkin UPS, I usually switched it off and unplugged it after I shutdown my PC each evening. With the APC UPS, I can unplug it or switch it off at the socket fine, but it will randomly trip the RCD when I supply power to it again, even if it's already plugged in. As long as I leave it powered by the mains, it's fine, i.e. I can switch on/off its output and it can cut-in/out (e.g. self test) without tripping the RCD. The only issue is it consumes about 20 watts continuously even with its outputs switched off, one reason I used to unplug the old UPS when I shutdown my PC.
Seán Byrne
2018-03-21 18:29:02 +0000 UTCBeautiful construction. Truly built to last! If it came across my bench at work I'd say clean it, swap out the MOVs and the caps and send it out for another round. (-and de-flux the damn board afterward this time! ;) ) Part of the fun is laying hands on this stuff and observing stuff like materials and design.
Michael Thompson
2018-03-21 12:17:38 +0000 UTCIt would be extremely low, with most current via the X2 capacitors between Live and Neutral. The Hopi won't even show purely capacitive current if not accompanied by a measurable load.
Big Clive
2018-03-21 09:16:08 +0000 UTCI am surprised that you didn't plug it in the HOPI and check the current draw of the class X and Y capacitors.
Charles Bruckner
2018-03-21 09:11:56 +0000 UTCVery easy to fix if needed, and I think you're right that it is just coupling a little noise to earth due to arcing when unplugging. RCDs can be pretty sensitive, which is mostly a good thing. Maybe measure the leakage of the Class Y caps and MOVs to see if any are on the way out?
Kean
2018-03-21 07:52:41 +0000 UTCThat could be an issue, although if the MOV was leaking enough continuous current to trip the RCD it would be getting pretty hot. At 25mA leakage it would be dissipating 6W. I'm not sure if that would trip the thermal fuses or not.
Big Clive
2018-03-20 22:44:28 +0000 UTCSounds like trouble ahead for ELCB/RCCB users if the MOVs become leaky over time..
Gordo
2018-03-20 21:06:42 +0000 UTC
