Control transformers in 3 phase environment
Control transformers in 3 phase environment
(OP)
I am used to using 120/240 V input control transformers in the single phase environment. In some European environments only the three phases and ground are available, so the control transformer input has to go phase to phase. Can anyone give advice on manufacturers of control transformers (20VA region) that makes product for 400V input? The US manufacturers seem to all only make 120/240V versions.





RE: Control transformers in 3 phase environment
I could give you plenty European manufacturers but there's not much point if you're in the US or Canada.
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If we learn from our mistakes I'm getting a great education!
RE: Control transformers in 3 phase environment
Thanks!
RE: Control transformers in 3 phase environment
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Control transformers in 3 phase environment
Why I say that (nominal) 120V control is ill advised is that in many IEC countries they will not be used to 120V as a control voltage, their wiring standards are different, and spare or replacement parts will be difficult for them to procure in an emergency breakdown situation. they typically go with either 230V control or more recently, 24VDC. So a better choice for more universal appeal is to go with 24VDC control and a decent power supply instead of a CPT.
RE: Control transformers in 3 phase environment
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Control transformers in 3 phase environment
It might be worth checking out Farnell Electronics because I know they have a tie-up with Newark so we can get Newark parts in the UK: I assume a reciprocal agreement probably exists. RS Components are another big UK distributor, after that the electrical wholesalers like Newey & Eyre would be a good starting point. What sort of quantity are you looking for? If you need larger quantities I will dig up a couple of suppliers who we have used in the past.
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If we learn from our mistakes I'm getting a great education!
RE: Control transformers in 3 phase environment
Thanks!
RE: Control transformers in 3 phase environment
Note the 400V primaries.
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You can probably get these at NEWARK or Allied-Electric
BTW: You don't need a neutral. The transformer creates a new isolated source from across the two 'lines'. You then ground one side of the secondary,(low voltage in your case), making it the neutral of your control source.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com