12.5/16 MVA Power Transformer Data sheetFull description
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Primary Input Voltage in Vrms Primary Input Current in Irms
= =
240
Secondary Output Voltage in Vrms Secondary Output Current in Irms
= =
19.3 10.95
Transformer Effieciency
=
0.9
Transformer VA Rating
=
234.82
Primary Current
=
0.98
(A)
V A (Optional) V A (Assumption)
> Calculate here if the primary input curre > Select primary wire gauge for 200A/sq.c
Assuming transformer operate at continuously, continuously, C = 1.2 Core Area, a = 18.39 sq.cm Stacking Factor Gross core area,
A
For square type core, Core width Turns per volt =
N V
wher wh ere e
10
=
0.9
(Assumption)
=
20.43
sq.cm
=
4.52
cm
8
4 FfaB
V - volt voltag age e acr acros oss s the the wind windin ing g in in vol volts ts r.m. r.m.s s F - form factor f actor of the a.c waveform f - frequency in Hz a - cross-sectional area of the core N - number of turns of considered winding B - flux density in maxwell per unit area
Operation frequency, Form factor, F Flux Density, B
f
Turns per volt Number of turns in primary Number of turns in secondary
= = =
50 1.1 11500
=
2.15
Hz (For sine wave) (For CRGO core metal stamping)
= =
515.88 45.633
* Determine wire size according to SWG or AWG Table Primary wire gauge = 137 (turns/sq. cm) Secondary wire gauge = 12.8 (turns/sq. cm) * Determine window area according to SWG or AWG Table Area occupied by primary = 3.77 Area occupied by secondary = 3.57 Total area occupied by windings
=
7.33
sq. cm sq. cm sq. cm
must be
15.32
sq. cm
t is unknown. Pg 336
Waste Free Core Dimension Design 13.56
2.26 11.30
2.26 4.52
* in cm * according to Core Proportions Table (Pg 77)
(Pass)
6.78
Transmissible Power,
where
P
K . f . Bm. J .Kw. Aw. Ac 10
4
K - operating waveform constant f - operating frequency Bm - Maximum flux density swing of the core material (Wb/m ²) J - Current density of wire (amp/cm²) Kw - window area utilisation factor Aw - window area of core (cm²) Ac - Core area (cm²)
Primary Input Voltage in Vrms Primary Input Current in Irms
= =
240
V A (Optional)
Secondary Output Voltage in Vrms Secondary Output Current in Irms
= =
24 10
V A
Primary current
=
0.79
Input VA Output VA
= =
377.12 240.00
> Calculate here if the primary input current is unknow n. > Select primary wire gauge for 400A/sq.cm Pg 200
Transformer Efficiency
=
0.90
Transmissible Power, P
=
308.56 = = = = = = = =
Maximum Flux Density, Bm Current Density of Wire, J Window Area Utilisation Factor, Kw Circuit Constant, K Circuit Constant, K1 Operating Frequency, f Core area, Ac Window Area of Core, Aw Area Product, Turns per volt,
Ap
T V
Primary Turns Secondary Turns Winding Area Required =
Primary turns per cm² Secondary turns per cm²
( Aw Ac) cm
4
=
K 1. f . Bm. Ac 10 = =
701.28
0.20 400.00 0.50 2.20 6.28 50 0.255 0.25
Wb/m² Amp/cm²
Hz cm² cm²
(Typical 0. (Refer to E (Typical 0. (Depends (Depends (Refer Dim (Refer Dim
> Check for suitable coredimen =
1
(Assumption)
624.14
4
299585.78 14979.29
Total no. of turns Turns per cm² = =
(Refer to Enamelled Copper Wire SWG Tabl (Refer to Enamelled Copper Wire SWG Tabl
Primary Winding Area Secondary Winding Area
Checking:
= =
#DIV/0! #DIV/0!
Bmax Total window area required
= =
0.02 #DIV/0!
(Within Limit) #DIV/0!
- 0.3) amelled Copper Wire SWG Table Pg 200) - 0.5) n circuitry, refer book Pg 196) n circuitry, refer book Pg 196) ension of Ferrite Cores Pg 326) ension of Ferrite Cores Pg 326) ion at Pg 326
