Eff vs Load

98.6% 98.8% 99.0% 99.2% 99.4%**E f** **f i** **c i** **e n** **c y**  **25 kV**  **A Single** 

**- phase Pole T**  **yp e** 

Page 1 98.2% 98.4% 98.6%

1.00 0.98 0.98 0.89 0.87 0.86 0.85 0.84 0.74 0.68 0.66 0.65 0.64 0.62 0.62 0.61 0.60 0.60 0.59 0.59 0.59 0.58 0.56 0.56 **Transformer Load (p.u.)**

T1 %Efficency T2 %Efficency T3 %Efficency T4 %Efficency1500

2000 2500 3000 3500 4000**k i** **l o** **w a** **t t** **- h** **o u** **r s** **( k** **W h** **) 25**  **kV A**  **Single**

**- phase Pole T**  **yp e** 

0 500 1000

**Equivalent Hours**

T1 losses T2 losses T3 losses T4 lossesDesign

**$1,575 $2,444**  **$2,655 $2,800** 

$1,300 $1,800 $2,300 $2,800 $3,300

99.0% 99.0% 99.1% 99.1% 99.2% 99.2% 99.3%**I n** **i t** **i a** **l C** **o s** **t (** **I .** **C .** **) E** **f f** **i c** **i e** **n c** **y** Equivalent (p.u.) 0.73 Equivalent (p.u.) 0.5 I.C.

Page 1 $300 $800 $1,300

98.8% 98.9% 98.9% 99.0%

Present 2010 design M3_CuAl_dgw_sh M2_CuAl_dgw_sh ZDMH_CuCu_dgw_sh

T1 T2 T3 T450 kVA Single-phase pad-mount transformer 13200 to 240/120 125 kV BIL Ratio "A"/"B" 5.3 4.6 D01_C03_F3_A11.00_B3.33 Present 2010 design M3_CuAl_dgw_sh I.C. $1,575 $2,444 Loss Cost $1,073 $980 E.C. $2,648 $/watt watts/kVA $3,424 Pnl "A-factor" 100 $4.00 2.00 100 Pll "B-factor" 530 $1.27 10.60 456.71 Ptotal 630 556.71 Max eff 99.09% 99.15% @ p.u. 0.43 0.47 p.f. 1.00 T1 losses T1 LOAD LOAD Ptotal @pu load %Efficency Ptotal Hours (kW H) (p.u.) @ p.u. load (kW H) @p.u. load @ p.u. load 365 18,250 1.00 630 230 98.76% 557 730 36,195 0.98 612 453 98.77% 542 1095 54,060 0.98 608 675 98.77% 538 1460 70,317 0.89 521 865 98.84% 462 1825 86,236 0.87 503 1049 98.86% 448 2190 101,937 0.86 492 1229 98.87% 438 2555 117,389 0.85 480 1404 98.88% 427 2920 132,730 0.84 475 1577 98.88% 423 3285 146,273 0.74 392 1720 98.95% 352 3650 158,612 0.68 342 1845 99.00% 309 4015 170,656 0.66 331 1966 99.01% 299 4380 182,515 0.65 324 2084 99.01% 293 4745 194,158 0.64 316 2199 99.02% 286 5110 205,496 0.62 305 2310 99.03% 276 5475 216,747 0.62 301 2420 99.03% 274 5840 227,882 0.61 297 2529 99.03% 270 6205 238,775 0.60 289 2634 99.04% 263 6570 249,664 0.60 289 2740 99.04% 263 6935 260,502 0.59 287 2844 99.04% 261 7300 271,288 0.59 285 2949 99.04% 260 7665 282,058 0.59 285 3052 99.04% 259 8030 292,643 0.58 278 3154 99.05% 254 8395 302,950 0.56 269 3252 99.06% 246 8760 313,130 0.56 265 3349 99.06% 242 Efficiency overall - **98.94%** Efficiency overall - $20,604 Energy cost

OC1Y2009 Cost adder $869 $0.0658 saved kW h 342per kW h Saved per yr $23 Pay back yrs 39 Pay back yrs at 4.00% 40kVA Single-phase pad-mount transformer

4.6 3.8 D01_C03_F3_A11.00_B3.33 D01_C05_G3_A16.00_B3.50 D01_C07_G3_A16.00_B4.50 M3_CuAl_dgw_sh M2_CuAl_dgw_sh ZDMH_CuCu_dgw_sh $2,655 $2,800 $915 $882 $/watt watts/kVA $3,570 $/watt watts/kVA $3,682 $/watt watts/kVA $4.00 2.00 92.44 $4.00 1.85 99.98 $4.00 2.00 $1.27 9.13 429.12 $1.27 8.58 379.78 $1.27 7.60 521.56 479.76 99.21% 99.23% 0.46 0.51

T2 T3 T4 losses T2 losses T3 losses T4 @pu load %Efficency Ptotal @pu load %Efficency Ptotal @pu load %Efficency (kW H) @p.u. load @ p.u. load (kW H) @p.u. load @ p.u. load (kW H) @p.u. load 203 98.90% 522 190 98.97% 480 175 99.05% 401 98.91% 507 376 98.98% 467 346 99.06% 597 98.91% 504 559 98.98% 464 515 99.06% 766 98.97% 433 717 99.04% 401 661 99.11% 929 98.98% 419 870 99.05% 389 803 99.12% 1089 98.99% 410 1020 99.06% 381 943 99.12% 1245 99.00% 400 1166 99.06% 372 1078 99.13% 1399 99.00% 396 1310 99.07% 368 1213 99.13% 1528 99.06% 329 1430 99.12% 309 1326 99.17% 1640 99.09% 289 1536 99.15% 274 1426 99.20% 1750 99.10% 279 1638 99.16% 265 1522 99.20% 1856 99.11% 274 1738 99.16% 260 1617 99.21% 1961 99.11% 267 1835 99.17% 255 1710 99.21% 2062 99.12% 258 1929 99.18% 247 1800 99.21% 2161 99.12% 256 2023 99.18% 244 1889 99.21% 2260 99.12% 252 2115 99.18% 241 1978 99.22% 2356 99.13% 245 2204 99.18% 235 2063 99.22% 2452 99.13% 245 2294 99.18% 235 2149 99.22% 2547 99.13% 244 2383 99.19% 234 2235 99.22% 2642 99.13% 242 2471 99.19% 233 2320 99.22% 2736 99.13% 242 2559 99.19% 232 2404 99.22% 2829 99.13% 237 2646 99.19% 228 2487 99.22% 2919 99.14% 229 2729 99.19% 221 2568 99.22% 3007 99.14% 226 2812 99.20% 218 2648 99.22% Efficiency overall - **99.05%** Efficiency overall - **99.11%** Efficiency overall - **99.16%**

$1,080 $1,225 537 701$35 $46 31 27 32 28Load T1 T2 (p.u.) Present 2010 design M3_CuAl_dgw_sh Equivalent (p.u.) 0.5 99.08% 99.15% Equivalent (p.u.) 0.73 98.96% 99.07%

I.C. $1,575 $2,444 Note: System load curve taken from year 2005 hourly demands.

1 365 0.967 352.907 0.958 349.746 0.794 289.633 0.761 277.724 0.740 270.164 0.717 261.659 0.707 257.923 0.551 201.002 0.457 166.847 0.436 158.959 0.422 154.117 0.407 148.552 0.386 140.891 0.380 138.725 0.372 135.876 0.356 130.031 0.356 129.954 0.353 128.707 0.349 127.508 0.348 127.098 0.336 122.788 0.319 116.431 0.311 113.578

0.73 (rms value) Equivalent loadT3 T4

M2_CuAl_dgw_sh ZDMH_CuCu_dgw_sh 99.21% 99.23% 99.13% 99.18% $2,655 $2,800 Note: System load curve taken from year 2005 hourly demands.