Yes.The issues are its safety lead, which is supposedly in center between primary and secondary, to prevent harm to user IF transformer gets impaled or otherwise damaged so mains is no longer isolated in addition to noise reduction, is this correct?
Correcti know that in order for safety-earth to work as intended, it needs to be connected in ''input'' mains, which is at the wall.
The secondary of the ISOLATION transformer must not be connected to earth. Otherwise it is no longer an isolation transformer.But, what about the other side, secondary, which is used in test equipment? Is it needed in secondary side as there is isolation between earth and secondary live?.
If the two secondaries are isolated from each other, then yes you can connect them in parallel.Also this transformer which i have has 2xmains in secondary, according to teacher they can be paralled as they are in same phase.
This sounds like a really bad idea!I have already pre-assembled two-variacs in parallel to increase current handling.
I would connect the fuse or circuit breaker on the input side of the variac/transformer unit where it connects to the mains supply.What becomes of fuse/thermal overload-fuse, they should be connected in winding, right?
Why do you need a noise filter?but what about noise filter, as it seems to need that too,
And this "bomb" will also give you a nasty nip if you are not carefull!Main purpose is to make this thing so it can be used ''safely'' as test gear.....as mains is never safe.
If the two secondaries are isolated from each other, then yes you can connect them in parallel.
BUT, you must make sure that the phasing is correct, otherwise it will go BANG when you connect the supply.
This sounds like a really bad idea!
Are the variacs on a common shaft so that they turn together?
Are the variacs identical and track perfectly so that the output voltage of each variac is the same at all positions of the wiper?
The secondary windings on a transformer have a start and an end.Now this is new, how come phasing can be incorrect if they are fed from single phase mains?
Sorry, I have no idea what that thing is in your picture.and as of that noise filter, i said it wrong, sorry i meant like these what are found in CRT monitors
Hmm, tvtech might know what that component is by official name.
if i got it right, you mean that windings can be connected in SERIES by an accident? the voltages add up just as you said like in series
hey tech, i suppose its allright to call you tech? but, seems you were right! i googled ptc and bingo, excactly same components along with those more common, ceramic case came up. Thanks!
And you asked what i'm trying to do, perhaps i should have posted picture earlier just to clear things out!here goes, pretty much same thing as in picture, just isolated variac with analog A/V meters along with fuses for isolation transformer and variac slides
**broken link removed**
well, seems there is no place for PTC in this puzzle, i thought that they were spark gaps lol.....well, teacher said thatand funny, i saw marking ptc right where i pulled these off from crt pcb....
in fact, he said that these are used to reduce inrush current, which PTC does too
Yeah, i agree with that. Once there was situation at school when one student said to techer right in the class ''you don't have a clue what you are saying, right?'' and theacher went pretty pale-faced.
There are couple of teachers who i like the most, but other has pretty annoying way of teaching: he just tells the theory, but don't know how to make it so student will understand it too! and sometimes topic is even other than what was asked. Like once i asked ''how do i determine voltage, or something like that from scope?'' he replied about telling capacitors maximum instant current voltage when in AC polarity changes....and no surprise, not helping a bit, in that day that is.
Now then, other teacher, he really knows what he knows, and what doesn't know. He says it clearly if he doesn't know. And he knows how to teach so others undersntand! Like in parallel resistors, transistors, fets, 'scope etc....he taught me at least 80% what i learnt in school. Other very valuable source of information is indeed ETO here, i'm so lucky and thankful for this amount of aknowledge you guys have.
last time i was at job, yes my contract was cancelled due the fact materials ran out. boss said that he would have taken me full-time if things were different, i got no complaints in that week i was working it there. i learnt there in week more than half year in school, at least. We don't install those bigger fuses, don't know their names, but what have handle on them. and funny thing was, even thought i haven't done those things before, i was constantly running out of things to do . My supervisor said ''ok, now you can take a little break'' .
little bit off topic perhaps. But, as for topic, i found perfect case for this project: microwave ovens inner case. I just install plywood/stiff metal to cover it more. and of course there is work for panel meter installments and so on. But those things simply cost too much locally, and with this material on-hand, there's no harm in little DIY no?
^i'm thinking to make mains cord fixed,or with jack, not sure yet.
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