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Old 10th November 2011, 06:16 PM   #101
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hi tony,
is this softwares perfect?
what is cross section in awg table?
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Old 10th November 2011, 06:50 PM   #102
AndrewT is offline AndrewT  Scotland
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Hi,
the left pic must be wrong.
Those X & Y dimensions must be about a factor of 10 in error.
Could it be he has his mm and cm mixed up?

The middle pic seems to be right I have used it to estimate EI transformers I have bought secondhand or inside existing equipment. One part missing from Klaic' software is choosing the working flux.
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Old 10th November 2011, 09:01 PM   #103
AJT is offline AJT  Philippines
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Quote:
Originally Posted by nazirdigi View Post
hi tony,
is this softwares perfect?
what is cross section in awg table?

the picture on the left must be in cm not mm as shown, otherwise the calculations are okay.......

cross-section area = (2pi x diam)/4 = (6.28 x diam.)/4, it forms basis for current density in your copper, i am used to imperial units, i use 500 or 700 cm per ampere current density. the ARRL handbook has this nice table to look at...

Click the image to open in full size.
Click the image to open in full size.
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Last edited by AJT; 10th November 2011 at 09:09 PM.
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Old 11th November 2011, 12:15 AM   #104
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thanks andrew and tony for replies,
do u have any other softwares for calculations.
thanks.
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Old 11th November 2011, 02:02 AM   #105
AJT is offline AJT  Philippines
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i do not have other software's, to be frank about it, i do not use those calculators as a basis for my designs but for preliminary computations at times......

as you go along making transformers, designing and building becomes as easy as counting 1 2 3.........
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Old 15th November 2011, 06:58 AM   #106
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sir Tony, I have this CRGO core, and size u can see,
can u tell me about winding to get 80-40-0-40-80volts at25 amp?

Thank u
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Old 15th November 2011, 08:22 AM   #107
AJT is offline AJT  Philippines
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Quote:
Originally Posted by sandeep kayarkar View Post
sir Tony, I have this CRGO core, and size u can see,
can u tell me about winding to get 80-40-0-40-80volts at25 amp?

Thank u
have you done traffo winding before?
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Old 15th November 2011, 10:49 AM   #108
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yes, since2000,
i know how to wind, i saw this,
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Old 15th November 2011, 10:59 AM   #109
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And i also have Transfomer winding calculation softwar which shown by Sir nazirdigi
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Old 15th November 2011, 11:06 AM   #110
AndrewT is offline AndrewT  Scotland
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San,
using the 40+40Vac windings as the 25Aac you require 2kVA from the transformer.
The 2" core stacked to 3" thick gives 6sq" of core area.
That equates to ~1100VA. Well short of 25Aac @ 40+40Vac.
12Aac for the 40Vac windings and 7Aac for the extra 40Vac windings would seem to be in the ball park.
I think that is why Tony asked
Quote:
have you done traffo winding before?
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