Delta connected load on- off control

Thread Starter

ilginsarican

Joined Jul 13, 2017
111
Hi,
I have to on-off switch a AC load, which delta connected 3 phase AC source.
Consider the load that will be switched on-off is Z1.
To achieve on-off switch, I think use zero cross triac opto driver and triac for both Phase-R and Phase-Y.
But I am confused.
When Phase-R reaches zero point, triac will be closed but, Phase-Y won't be zero beacuse of 120degree phase angle.
Will this situation damage the load? Does it cause any problems?
Is phase control required?


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Ian0

Joined Aug 7, 2020
1,842
Z1 doesn't actually know that it's on a three-phase supply.
Just ignore the blue phase, and treat it as though Red were Live and Yellow were Neutral in a single phase situation.
 

Thread Starter

ilginsarican

Joined Jul 13, 2017
111
Z1 doesn't actually know that it's on a three-phase supply.
Just ignore the blue phase, and treat it as though Red were Live and Yellow were Neutral in a single phase situation.
Hello again,
I have a single phase AC-DC converter.
As I mentioned above, is it possible to feed converter from 2 phase of delta system as long as voltage and frequency range are provided?
 

Ian0

Joined Aug 7, 2020
1,842
Hello again,
I have a single phase AC-DC converter.
As I mentioned above, is it possible to feed converter from 2 phase of delta system as long as voltage and frequency range are provided?
Again, it just looks like any other single phase supply to the converter. Don't forget that the phase-to-phase voltage is √3 x the phase-to-neutral voltage.
 
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