Step down transformer for Asia
Step down transformer for Asia
(OP)
I need a transformer for a machine being sent to Singapore. The machine uses 3-phase, 208 VAC, 30 Amps, 60 Hz. The plant supplies 3-phase, 415 VAC, 50 Hz. I know it should be around 15KVA rating but I'm not sure what transformer to get. Any help/suggestion is greatly appreciated.






RE: Step down transformer for Asia
RE: Step down transformer for Asia
RE: Step down transformer for Asia
Maximum voltage.
KVA
A suggestion;
A 480V:480V transformer configured as a 960V:480V auto-transformer will be suitable. Apply 416V to the 960V connection and take 208V from the 480V taps.
The size in KVA will be almost double what you actually need.
It will probably be a lot cheaper to call Hammond or another maker for a 50Hz transformer.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Step down transformer for Asia
RE: Step down transformer for Asia
RE: Step down transformer for Asia
RE: Step down transformer for Asia
My equipment (208 VAC, 30 A) has components rated at 50/60 Hz so frequency is no a problem, but I was a bit confused by the 415 VAC requirement sent by the customer. I thought 480 was the norm.
Thank you very much for your help.
RE: Step down transformer for Asia
If you go custom, then you have another issue. If a transformer is designed for 60Hz, applying 50Hz to it will put it into a low flux situation and the output capacity may be reduced because the magnetizing current will increase. So for the same amount of load on the transformer, it will run hotter at 50Hz and therefore the output capacity at full load will be reduced. So when you have a custom transformer made, make sure they know you are going to be using 50Hz up front, you can get into trouble if they build it for 60Hz.
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RE: Step down transformer for Asia
A 60Hz transformer at 480 Volts has a V/Hz ratio of 8 Volts per Hertz.
At 50 Hz times 8 V/Hz the transformer will be rated at 400 Volts. (8 x 50) Saturation is a possible issue with a voltage above 400 Volts.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Step down transformer for Asia
You might consider something like a "Group-U" [440Δ - 220Y/127V 3ø, 50Hz] transformer listed at www.acm
RE: Step down transformer for Asia
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Step down transformer for Asia
RE: Step down transformer for Asia
RE: Step down transformer for Asia
Bill
--------------------
"Why not the best?"
Jimmy Carter