690VAC 3 phase power?
690VAC 3 phase power?
(OP)
Have a project where they are stating they have 690VAC/50/3
I believe the location is Madagascar but what I've found is they use 380VAC or 230VAC.
690 seems like an odd voltage for 3 phase motors, and even worse finding a control transformer that can give me 115VAC for the PLC.
Has anyone run into this voltage before?
I believe the location is Madagascar but what I've found is they use 380VAC or 230VAC.
690 seems like an odd voltage for 3 phase motors, and even worse finding a control transformer that can give me 115VAC for the PLC.
Has anyone run into this voltage before?





RE: 690VAC 3 phase power?
Here is a brief about the reasoning.
RE: 690VAC 3 phase power?
RE: 690VAC 3 phase power?
Bill
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"Why not the best?"
Jimmy Carter
RE: 690VAC 3 phase power?
It's certainly not a 'custom' transformer, nor custom motors.
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If we learn from our mistakes I'm getting a great education!
RE: 690VAC 3 phase power?
But I also think you may want to re-think your decision to use 115VAC input to your PLC, or for anything else in your panel for that matter. NOBODY in Madagascar, or anywhere else in that region, is going to be able to procure any 115V replacement parts, coils, breakers etc. The much much more commonly accepted control voltage strategy worldwide like this would be 24VDC. You can easily find 24VDC power supplies that will accept 690VAC input. But also check the configuration of the supply system because waross is right, 690VAC is almost always Wye (Star) meaning it's really 400Y690V, so to feed a power supply it would be better to use 400V by connecting Line and Neutral.
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RE: 690VAC 3 phase power?
Jeff's comment about control voltage is correct. But, there are also 220/230 V AC coils used. For larger contactors and for breakers, 220/230 V is very common.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: 690VAC 3 phase power?
RE: 690VAC 3 phase power?
This is common practice since electronics were introduced in power station environments decades ago. I mean from the days of analog electronics such as excitation systems and turbine governors.
rasevskii
RE: 690VAC 3 phase power?
Neil