Note: single-phase 50kVA pad -mounted transformer from Yr 2010.

y = 60x3 - 448.5x2 + 1361.5x + 166

R2 = 1 $0 $500 $1,000 $1,500 $2,000 $2,500

25 50 75 **kilovolt -** **ampere Transformer Initial Cost** 

I.C. Poly. (I.C.)

**Transformer No -**  **load and Load Losses** No - load Load Linear (No - load) Power (Load) y = 311.24x 0.757 R2 = 0.9989

0 100 200 300 400 500 600 700 800 900 1000

25 50 75**w a** **t t** **s**

**kilovolt -** **ampere Transformer No**  **- load and Load Losses**  No - load Load Linear (No - load) Power (Load)

1000 1200 **Transformer Total Losses** Total Power (Total)

### y = 371.79x 0.7538 

### R2 = 0.9995 0 200 400 600 800 1000

25 50 75**w a** **t t** **s**

**kilovolt -** **ampere**kVA I.C. calc_est X^3 X^2 X 25 $1,139 $1,139 1 1 1 50 $1,575 $1,575 8 4 2 75 $1,834 $1,834 27 9 3 100 $2,276 $2,276 64 16 4 Note: Price scaled using a third order poly nom ial.

kVA No-load calc_est Load calc_est

Losses in watts + 1361.5x + 166

100

Power (Load) kVA No-load calc_est Load calc_est 25 61 61.9 309 311.2 50 100 98.3 530 526.0 75 134 134.7 727 715.0 100 171 171.1 874 888.9 Note: No-load scaled using a linear equation. Load loss determined using a power scale.

DOE kVA Total calc_est calc_est 25 370 371.9 375 50 630 627.1 base 75 861 851.3 854 100 1045 1057.4 1060 Losses in watts y = 36.4x + 25.5 R2 = 0.9994
100 Power (Load)Note: Scaled total losses (TL) from a 50 kVA1-ph pad-mount (base) to a 25, 75 and 100 kVA rating (S) within a 125 kV BIL design line using the DOE 0.75 Scaling Rule: TL1 = TL0 x (S1 / S0)^0.75 0.7538 

### R2 = 0.9995
100Note: single-phase 25 kVA pole type transformer from Yr 2010.

y = 18.5x3 - 40.083x2 + 67.56x + 504.71

R2 = 0.9992

$0 $1,000 $2,000 $3,000 $4,000 $5,000 $6,000

10 15 25 50 100 167 **kilovolt -**  **ampere** 

### Transformer **Initial Cost**

I.C. Poly. (I.C.)

2000 

### Transformer No **- load and Load Losses**  No - load Load Poly. (No - load) Poly. (Load)

y = - 1.1023x4 + 16.886x 3 - 74.958x

R2 = 0.9998 y = - 1.2538x4 + 23.144x 3 - 89.958x2 + 189.86x + 12.429

R2 = 0.9987

0 200 400 600 800 1000 1200 1400 1600 1800 2000

10 15 25 50 100 167**w a** **t t** **s**

**kilovolt -**  **ampere** No - load Load Poly. (No - load) Poly. (Load)

**Transformer Total Losses**y = - 2.3561x4 + 40.03x3 - 164.92x2 + 327.34x - 32.286 R2 = 0.9992

0 500 1000 1500 2000 2500

10 15 25 50 100 167**w a** **t t** **s**

**kilovolt -** **ampere Transformer Total Losses** 

Total Poly. (Total)kVA I.C. calc_est X^3 X^2 X 10 $532 $551 1 1 1 15 $683 $627 8 4 2 25 $815 $846 27 9 3 50 $1,261 $1,318 64 16 4 100 $2,235 $2,153 125 25 5 167 $3,428 $3,463 216 36 6 250 $5,363 $5,359 343 49 7 Note: Price scaled using a third order poly nom ial.

kVA No-load calc_est Load calc_est X^4

Losses in watts 167 250

Poly. (Load) kVA No-load calc_est Load calc_est X^4 10 34 34 137 134.2 1 15 46 48 189 197.4 16 25 63 60 296 295.7 81 50 102 104 520 492.8 256 100 191 191 781 822.2 625 167 301 300 1312 1287.3 1296 250 390 390 1856 1861.5 2401 Note: No-load and load loss scaled using a fourth order poly nom ial.

DOE kVA Total calc_est calc_est 10 171 168 181 15 235 245 245 25 359 355 base 50 622 597 604 Losses in watts 74.958x2 + 137.48x - 44.714 R2 = 0.9998
167 250 Poly. (Load)100 972 1013 1015 167 1613 1588 1492 250 2246 2251 2019 Note: Scaled total losses (TL) from a 25 kVA1-ph pole ty pe (base) to a 10, 15, 50, 100, 167 and 250 kVA rating (S) within a 125 kV BIL design line using the DOE 0.75 Scaling Rule: TL1 = TL0 x (S1 / S0)^0.75

167 250X^3 X^2 X

1 1 1 8 4 2 27 9 3 64 16 4 125 25 5 216 36 6 343 49 7