transformer specs

[dap021]

trying to order transformer from supplier (not really my thing, but i digress) and got a reply questioning operating frequency and duty cycle. don't want to sound too ignorant, so what are they or how do i determine them?

 

[itsmoked]

Well I must say, to be the one ordering a transformer and not knowing those two terms... puts you way south of Ignorant.


You need more help than we can give in a "tips" forum to have any chance of getting a vaguely correct transformer for your/somebodies needs.

Google "transformer" and "duty cycle".

Transformers only work with varying current. Which is brought about by varying voltage. The rate that they vary is given by the Frequency.

"Duty cycle" refers to how much something can be on over a stated period of time.

Good luck.

 

[cuky2000]

The best advise that we could offer you is to hire a competent professional electrical engineer or a licensed electrician.
_{In addition of frequency and duty, there are many other parameters to take in consideration. Sample of those parameter are capacity (MVA, kVA,...), voltage rating ( primary and secondary side), number of winding, single or three phase, connection (delta, wye, zig-zag, etc), number of winding (single, center tap, three winding, auto-transformer, etc), load-tap-changer(manual, auto), Insulation strength (BIL, SIL), number of bushing & creepadge distance, cooling system(ONAN, ONAF, etc) type of cooling media (air/dry, oil or silicon filled, etc)mounting (pole, pad mounted, mobile, etc), application (step-down, step-up, furnace, industrial, utility, outdoor or indoor, etc) standard or K rated, compliance, etc.}

Here is a simple sample of single-phase pole mounted unit:

http://www.cooperpower.com/Products/Specifications/Word/81.doc

 

[waross]

Frequency depends a lot on where you live. It will be one value at the prime meridian in the northern hemisphere. If you proceed west, it will at some point abruptly rise. If you then turn left and proceed south it will eventually fall back to the level found at the prime meridian.
If it's any consolation, an electrical person was once trying to buy a condensate return pump. He knew the pounds per hr. steam capacity of the boiler, he found the temperature of both the live steam and the condensate. He found the heating area of the boiler tubes.
Try as he might, he couldn't find the condensate return rate.
yours