What do you mean by a 'control transformer' and could/would a ≥2.5kW transformer qualify as such?
Kind Regards, John
LED lights failing
- Thread starter Simon35
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Kind Regards, John
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my transformer theory isnt to hot, what I understand is the laminations are insulated from each other to stop edicurrents. to make more power for switching serges the weld them together but it means the regulation is worse and edicurrents can flow around the bits and edicurrents mean loads of harmonics.
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All transformers with laminations have insulated lams for the reason you quoted.
So "control" does not mean small-current control signals, or monitoring....
Seemingly not, if what we're being told is correct - but that was obviously what I was wondering.
thats right and control trannys have them welded which brigdes the insulation.
you can see the welds in the pic earlier its a lineacross the side on the left and a little dent on the right level with the top of the bobin
It's been 35 years since I learnt about transformer construction but Tommy's post has rekindled something in the grey matter. I confirm the additional harmonics in control transformers when the load is reactive.
I totally agree that a control transformer such as the ETE's are not my choice for loads such as described in the OP and have no problem accepting this may be a cause of the failures.
I'm still not clear as to what is meant by a "control transformer". Are we now saying that it's this weld across the laminations which is the main distinguishing/'defining' feature?
Kind Regards, John
It is typical of control transformers.
As Tommy mentioned they do have to have unexpectedly high primary OCD's for the inrush, especially if they are fully loaded.
They are likely to be subjected to high and regular switching loads which 'normal' transformers would struggle with (I have replaced a significant number in the last 15 years or so with control versions).
They also have to cope with significant half wave rectified loads which can easily saturate a 'normal'
They do have high standing current and 'strange' regulation properties in as much as the secondary voltage tends to drop quickly with a fairly small load then hold up well to full load and beyond.
Maybe it is - but, as I keep asking, what exactly IS a "control transformer"?
Kind Regards, John
It is simply a transformer designed for control panel use. I'm sure there is an official name for them in just the same way as vacuum cleaners are known hoovers.
A control panel is just a type of enclosure, and, per se, has absolutely no electrical properties, except possibly EMI screening.
Clearly transformers with ratings of several kVA are not performing a "control" function - they may be controlled by other components in the panel, and thus be part of a system which provides control over motors, pumps, lighting, etc, but why does the transformer need to be of a special type? If I have some kind of control logic which controls loads supplied by a transformer, why do I need a "control transformer"? What is special about a "control transformer", and why is that specialness of such importance that it has to be provided at the expense of destroying the loads it supplies?
Clearly transformers with ratings of several kVA are not performing a "control" function - they may be controlled by other components in the panel, and thus be part of a system which provides control over motors, pumps, lighting, etc, but why does the transformer need to be of a special type? If I have some kind of control logic which controls loads supplied by a transformer, why do I need a "control transformer"? What is special about a "control transformer", and why is that specialness of such importance that it has to be provided at the expense of destroying the loads it supplies?
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