Ron,
There is a formula to estimate regulation but it's long and drug out, or what
I'd call the long formula. An estimate is a voltage drop of 11% to 14%. I
always use 12% myself and it generally comes out pretty close. Divide the
no-load voltage by 1.12 and that would be it.
To determine the power capacity, there's a simple formula which will get you in
the ballpark for 12 kilogauss iron at 60 Hz. It is determined by the cross
sectional area in sq. inches of iron in the core.
P = A / 0.16 ^2
A = 0.16 X Sqrt of P
P = Power in watts. In a single phase power transformer Volt Amperes (VA) =
Watts
A = Cross sectional area of the core in square inches.
However, the wire the coil is wound with has to be big enough for the load and
the duty cycle.
Best,
Will
----- Original Message -----
From: w2cqm@juno.com
To: Amps@contesting.com
Subject: [Amps] Determining Filament Voltage Specifications ??
Date: Thu, 7 Jul 2005 15:26:10 -0400
>
> Was wondering if there's some formula to roughly determine the
> voltage/current parameters of a super heavy duty filament transformer.
> The unit I have has multitap 220VAC primaries with solid buss bar output
> terminals (no CT) about the diameter of my pinky. The no load voltage is
> about 18.2 to 19.5 depending of the primary tap used. I'm certain the
> rating is better than 75amps. It might even be a low voltage weld
> transformer. Is there a method to load the transformer and determine
> the operating filament voltage under load? Any suggestions would be
> appreciated. Unfortunately, the plate clearly lists only the primary
> voltage. Thanks, ron W2CQM/3
>
> Plate has the following information:
>
> Hevi Duty Electric Co
> Basic Products Co.
> Milwaukee 1, WIS
>
> 1.4KVA for 45 minutes per hour
> Model SXO, #2431031
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
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