New Capacitor Analysis and Maintenance Process

at Centerpoint Energy

Presented at SWEDE Conference 2005

by Richard Moffatt

Why do we have Capacitors?(Power Factor = KW / KVA)

KW’s

KVARS

KVA

Process Improvement Recommendation

·Goal: Reduce Capacitor Maintenance Expense·Send capacitor crews directly to circuits with problem capacitors, and thus eliminate their random search for failed capacitors (Time, temp, fixed banks).·Develop program (CAPSURE) to detect capacitor banks that are switching but experiencing a partial failure on 1 or 2 phases. Uses load survey data for circuits (KW & KVAR) on 15 minute intervals. ·Produce “Bank Shot Report”·Produce “Low Power Factor Report”

Bank Shot Report

·Identifies KVAR changes greater than the minimum threshold value based on the smallest cap on circuit.·Looks for single phase or two phase failures.·Two tests:

·Magnitude of KVAR change (15 min intervals) compensated by KW load change.·KVA phase angle change.

·In most cases, can infer the probable bank size based on the magnitude of the change in KVARS.·Pull in caps on circuit from Capacitor Database.·Pull in PF at peak for identified circuits.

Bank Shot Report 9-1-04 Left Half of SpreadsheetCKT 8/30/2004 8/31/2004 9/1/2004 Wednesday Sept 1, 2004

PF Peak Peak Peak KW Last KW Last KW Last KW This KW This KW This KVAR Last KVAR Last KVAR Last KVAR ThisKVAR ThisKVAR This

CKT TIME This Read PF PF PF A B C A B C A B C A B C

AD 04 1:16 98.8 99.8 99.9 100.0 1389 1501 1529 1318 1413 1441 172 207 -3 309 348 -3AD 04 9:31 -99.8 99.8 99.9 100.0 1343 1188 1508 1375 1252 1557 292 204 -3 -66 -182 -3AD 04 12:16 -99.6 99.8 99.9 100.0 1811 1821 1986 1884 1853 2078 137 81 -3 -217 -291 -3AD 04 21:16 99.9 99.8 99.9 100.0 2239 2359 2500 2187 2370 2450 -90 -87 -3 91 137 -3AD 04 21:46 99 99.8 99.9 100.0 2071 2155 2370 1965 2197 2299 53 56 -3 397 524 -3AD 09 12:01 -98.4 99.5 99.9 99.9 1316 1501 1785 1305 1453 1749 -33 18 140 -434 -471 82AD 09 21:46 97.2 99.5 99.9 99.9 1543 1981 2318 1601 1917 2207 -70 61 583 356 440 583AF 01 1:01 90.8 99.4 99.9 99.8 1749 1770 1975 1749 1706 1917 799 356 435 831 767 873AF 01 9:46 96.9 99.4 99.9 99.8 1680 1633 1654 1691 1669 1865 789 673 757 773 251 314AF 02 8:01 -99.4 -99.7 -100.0 -100.0 1195 1158 1263 1158 1200 1242 282 -128 -139 293 -323 -350AF 06 12:01 -88.6 -99.6 -98.0 -97.9 1369 1369 1332 1495 1374 1364 -666 -476 -761 -766 -672 -777AF 06 23:01 -97.7 -99.6 -98.0 -97.9 1727 1548 1532 1590 1580 1559 -492 -381 -487 -360 -170 -497AF 07 13:01 99.1 98.9 99.3 99.6 1833 1369 1506 1986 1411 1696 525 124 277 330 161 203AF 07 13:16 97.7 98.9 99.3 99.6 1986 1411 1696 1938 1422 1553 330 161 203 609 145 314AF 10 10:01 99.9 100.0 -100.0 -99.8 905 1110 1300 915 1153 1342 61 525 314 -371 546 -65AN 04 22:46 96.5 96.2 96.9 96.7 1754 1800 1814 1754 1730 1765 738 179 292 703 446 281AN 05 14:46 -99.7 100.0 -100.0 -99.9 1983 2053 1825 2043 2190 1772 25 60 -379 -129 -76 -224AN 05 22:16 -99.3 100.0 -100.0 -99.9 1768 1905 1519 1828 1825 1501 -224 -192 -312 -31 -59 -509AN 06 2:31 95.3 96.4 98.8 97.6 2128 2054 2152 2120 2054 2088 809 206 253 786 580 625AN 06 9:31 98.5 96.4 98.8 97.6 1956 2025 2041 2152 2210 2283 715 564 596 762 208 211AN 07 19:01 -99.4 98.9 99.3 99.7 2046 1690 1790 2088 1732 1790 132 74 8 -294 -358 21AN 07 22:46 -98.9 98.9 99.3 99.7 1577 1242 1279 1598 1242 1297 -645 -648 -331 -149 -178 -286AN 09 0:31 97.8 99.2 99.4 99.3 1466 1642 1459 1318 1533 1389 496 88 -178 436 352 113AN 09 9:31 -99.9 99.2 99.4 99.3 1575 1628 1621 1617 1645 1673 267 148 -41 302 -150 -319AN 10 8:01 95 99.2 99.4 99.6 1155 1121 1466 1216 1189 1513 612 541 585 643 66 585AN 10 22:01 99.9 99.2 99.4 99.6 1202 1076 1825 1247 1044 1772 174 -598 211 177 -144 174AR 41 4:31 95.9 97.3 98.3 98.5 525 627 657 584 627 657 -422 175 146 233 175 146AR 41 9:01 -99.9 97.3 98.3 98.5 627 744 759 627 744 846 219 204 131 -422 204 131AR 42 12:16 97.6 96.5 98.0 97.5 5792 5238 6317 5938 5223 6449 1167 1021 1386 1371 1050 1503AR 42 12:46 97.5 96.5 98.0 97.5 6026 5369 6390 6230 5457 6697 1474 1123 1532 1459 1138 1619BA 01 10:01 100 98.1 98.6 98.9 1232 1390 1464 1237 1427 1506 277 393 229 251 -7 -244BA 01 20:01 97.3 98.1 98.6 98.9 1406 1601 1575 1448 1596 1516 303 24 -239 356 462 266BA 04 10:31 -100 100.0 -99.8 -99.6 1089 989 978 1137 1000 984 261 277 198 287 -118 -181BA 04 17:16 99.3 100.0 -99.8 -99.6 1791 1633 1427 1865 1627 1432 219 -228 -424 324 208 55BAR43 5:16 98.9 94.9 95.3 95.1 3341 3268 3020 3472 3356 3151 802 248 -72 802 306 379BAR43 10:31 96.8 94.9 95.3 95.1 5690 5690 5165 5792 5675 5150 1882 1328 1503 1940 1298 1036

Bank Shot Report 9-1-04 Righr Half of Spreadsheet This Reading

Load Compensated Delta Delta Delta Estimated Estimated TOTAL

Delta kvarsDelta kvarsDelta kvars Estimated Angle Angle Angle Kvars at Actual Kvars BANK BANKS ON CIRCUIT

CKT A B C ABC SIZE? A B C ABC 90% PF KVAR ONLINE VARS

AD 04 172 185 44 ==. 600 6.135 5.984 -0.007 ==. 2086 654 1432 5400 450Q,600Q,600TQ,1200F,1200Q,1350QAD 04 -374 -418 -24 ++. 1200 -15.015 -18.015 0.004 ++. 2092 -251 2343 5400 450Q,600Q,600TQ,1200F,1200Q,1350QAD 04 -390 -388 -46 ++. 1200 -10.897 -11.472 0.004 ++. 2907 -511 3418 5400 450Q,600Q,600TQ,1200F,1200Q,1350QAD 04 207 218 25 ==. 600 4.685 5.42 -0.001 .=. 3503 225 3278 5400 450Q,600Q,600TQ,1200F,1200Q,1350QAD 04 397 447 35 ==. 1200 9.956 11.926 -0.002 ==. 3230 918 2312 5400 450Q,600Q,600TQ,1200F,1200Q,1350QAD 09 -395 -465 -40 ++. 1350 -16.959 -18.648 -1.8 ++. 2253 -823 3076 3300 600F,600F,900Q,1200TQAD 09 397 411 55 ==. 1200 15.134 11.163 0.68 ==. 2862 1379 1483 3300 600F,600F,900Q,1200TQAF 01 32 443 467 .== 1350 0.861 12.836 12.063 .== 2686 2471 215 4800 900F,1200Q,1350Q,1350TAF 01 -21 -440 -548 .++ 1800 -0.59 -13.845 -15.036 .++ 2612 1338 1274 4800 900F,1200Q,1350Q,1350TAF 02 29 -216 -200 .++ 600 0.921 -8.757 -9.458 .++ 1800 -380 2180 4200 600T,600F,900Q,900TQ,1200TQAF 06 -163 -198 -32 ++. 600 -1.187 -6.89 0.072 .+. 2116 -2215 4331 2900 200Q,450TQ,450F,600F,600T,600TQAF 06 200 195 -23 ==. 600 3.144 7.686 -0.047 .=. 2364 -1027 3391 2900 200Q,450TQ,450F,600F,600T,600TQ

AF 07 -271 16 -169 +.. 900 -6.548 1.334 -3.597 +.. 2546 694 1852 2700 600F,900Q,1200TAF 07 303 -21 182 =.. 900 8.011 -0.687 4.605 =.. 2456 1068 1388 2700 600F,900Q,1200TAF 10 -437 0 -400 +.+ 1200 -25.927 0.027 -16.352 +.+ 1705 110 1595 3600 900F,1350Q,1350TQAN 04 -35 302 13 .=. 900 -0.978 8.777 -0.099 .=. 2624 1430 1194 3900 600F,900Q,1200T,1200TQAN 05 -184 -204 181 ++= 600 -4.335 -3.662 4.527 ... 3002 -429 3431 4500 600F,600TQ,900T,1200Q,1200TQAN 05 163 173 -188 ==+ 600 6.249 3.904 -7.125 =.+ 2577 -599 3176 4500 600F,600TQ,900T,1200Q,1200TQAN 06 -19 374 404 .== 1200 -0.473 10.041 9.959 .== 3131 1991 1140 3600 1200T,1200Q,1200FAN 06 -51 -448 -506 .++ 1350 -0.581 -10.187 -10.998 .++ 3322 1181 2141 3600 1200T,1200Q,1200FAN 07 -447 -453 13 ++. 1350 -11.706 -14.186 0.416 ++. 2805 -631 3436 3600 600F,900Q,900T,1200TQAN 07 485 470 36 ==. 1350 16.918 19.397 2.074 ==. 2068 -613 2681 3600 600F,900Q,900T,1200TQAN 09 14 318 326 .== 900 -0.388 9.864 11.607 .== 2120 901 1219 3600 600T,900F,900Q,1200TQAN 09 14 -306 -304 .++ 900 0.957 -10.405 -9.346 .++ 2467 -167 2634 3600 600T,900F,900Q,1200TQAN 10 0 -509 -23 .+. 1800 -0.049 -22.585 -0.615 .+. 1959 1294 665 3150 600T,1200T,1350QAN 10 -19 470 -10 .=. 1350 -0.158 21.21 -0.987 .=. 2031 207 1824 3150 600T,1200T,1350QAR 41 625 0 0 =.. 1800 60.543 0 0 =.. 934 554 380 600 600QAR 41 -641 0 -43 +.. 1800 -53.196 0 -0.99 +.. 1108 -87 1195 600 600QAR 42 131 36 51 =.. 450 1.609 0.337 0.744 ... 8805 3924 4881 7050 450TQ,900TQ,900Q,1200F,1800T,1800TQAR 42 -117 -29 -66 +.. 300 -0.565 -0.034 0.108 ... 9192 4216 4976 7050 450TQ,900TQ,900Q,1200F,1800T,1800TQBA 01 -28 -418 -494 .++ 1350 -1.201 -16.068 -18.093 .++ 2085 0 2085 2100 900F,1200QBA 01 32 440 534 .== 1800 1.651 15.286 18.58 .== 2280 1084 1196 2100 900F,1200QBA 04 2 -400 -382 .++ 1200 0.689 -22.376 -21.868 .++ 1560 -12 1572 1950 600F,1350TBA 04 68 439 476 .== 1350 2.884 15.234 18.748 .== 2462 587 1875 1950 600F,1350TBAR43 -65 14 385 ..= 1200 -0.492 0.87 8.224 ..= 4989 1487 3502 7300 1200T,1200Q,1300T,1800F,1800TQBAR43 7 -22 -459 ..+ 1350 0.216 -0.254 -4.851 ..+ 8308 4274 4034 7300 1200T,1200Q,1300T,1800F,1800TQ

Bank Shot Report 9-1-04 Critical Information9/1/2004 Load Compensated Delta Delta Delta

Peak Delta kvars Delta kvars Delta kvars Estimated Angle Angle Angle BANKS ON CIRCUIT

CKT TIME PF A B C ABC SIZE? A B C ABC

AD 04 1:16 100.0 172 185 44 ==. 600 6.135 5.984 -0.007 ==. 450Q,600Q,600TQ,1200F,1200Q,1350QAD 04 9:31 100.0 -374 -418 -24 ++. 1200 -15.015 -18.015 0.004 ++. 450Q,600Q,600TQ,1200F,1200Q,1350QAD 04 12:16 100.0 -390 -388 -46 ++. 1200 -10.897 -11.472 0.004 ++. 450Q,600Q,600TQ,1200F,1200Q,1350QAD 04 21:16 100.0 207 218 25 ==. 600 4.685 5.42 -0.001 .=. 450Q,600Q,600TQ,1200F,1200Q,1350QAD 04 21:46 100.0 397 447 35 ==. 1200 9.956 11.926 -0.002 ==. 450Q,600Q,600TQ,1200F,1200Q,1350QAD 09 12:01 99.9 -395 -465 -40 ++. 1350 -16.959 -18.648 -1.8 ++. 600F,600F,900Q,1200TQAD 09 21:46 99.9 397 411 55 ==. 1200 15.134 11.163 0.68 ==. 600F,600F,900Q,1200TQAF 01 1:01 99.8 32 443 467 .== 1350 0.861 12.836 12.063 .== 900F,1200Q,1350Q,1350TAF 01 9:46 99.8 -21 -440 -548 .++ 1800 -0.59 -13.845 -15.036 .++ 900F,1200Q,1350Q,1350TAF 02 8:01 -100.0 29 -216 -200 .++ 600 0.921 -8.757 -9.458 .++ 600T,600F,900Q,900TQ,1200TQAF 06 12:01 -97.9 -163 -198 -32 ++. 600 -1.187 -6.89 0.072 .+. 200Q,450TQ,450F,600F,600T,600TQAF 06 23:01 -97.9 200 195 -23 ==. 600 3.144 7.686 -0.047 .=. 200Q,450TQ,450F,600F,600T,600TQAF 07 13:01 99.6 -271 16 -169 +.. 900 -6.548 1.334 -3.597 +.. 600F,900Q,1200TAF 07 13:16 99.6 303 -21 182 =.. 900 8.011 -0.687 4.605 =.. 600F,900Q,1200TAF 10 10:01 -99.8 -437 0 -400 +.+ 1200 -25.927 0.027 -16.352 +.+ 900F,1350Q,1350TQAN 04 22:46 96.7 -35 302 13 .=. 900 -0.978 8.777 -0.099 .=. 600F,900Q,1200T,1200TQAN 05 14:46 -99.9 -184 -204 181 ++= 600 -4.335 -3.662 4.527 ... 600F,600TQ,900T,1200Q,1200TQAN 05 22:16 -99.9 163 173 -188 ==+ 600 6.249 3.904 -7.125 =.+ 600F,600TQ,900T,1200Q,1200TQAN 06 2:31 97.6 -19 374 404 .== 1200 -0.473 10.041 9.959 .== 1200T,1200Q,1200FAN 06 9:31 97.6 -51 -448 -506 .++ 1350 -0.581 -10.187 -10.998 .++ 1200T,1200Q,1200FAN 07 19:01 99.7 -447 -453 13 ++. 1350 -11.706 -14.186 0.416 ++. 600F,900Q,900T,1200TQAN 07 22:46 99.7 485 470 36 ==. 1350 16.918 19.397 2.074 ==. 600F,900Q,900T,1200TQAN 09 0:31 99.3 14 318 326 .== 900 -0.388 9.864 11.607 .== 600T,900F,900Q,1200TQAN 09 9:31 99.3 14 -306 -304 .++ 900 0.957 -10.405 -9.346 .++ 600T,900F,900Q,1200TQAN 10 8:01 99.6 0 -509 -23 .+. 1800 -0.049 -22.585 -0.615 .+. 600T,1200T,1350QAN 10 22:01 99.6 -19 470 -10 .=. 1350 -0.158 21.21 -0.987 .=. 600T,1200T,1350QAR 41 4:31 98.5 625 0 0 =.. 1800 60.543 0 0 =.. 600QAR 41 9:01 98.5 -641 0 -43 +.. 1800 -53.196 0 -0.99 +.. 600QAR 42 12:16 97.5 131 36 51 =.. 450 1.609 0.337 0.744 ... 450TQ,900TQ,900Q,1200F,1800T,1800TQAR 42 12:46 97.5 -117 -29 -66 +.. 300 -0.565 -0.034 0.108 ... 450TQ,900TQ,900Q,1200F,1800T,1800TQBA 01 10:01 98.9 -28 -418 -494 .++ 1350 -1.201 -16.068 -18.093 .++ 900F,1200QBA 01 20:01 98.9 32 440 534 .== 1800 1.651 15.286 18.58 .== 900F,1200QBA 04 10:31 -99.6 2 -400 -382 .++ 1200 0.689 -22.376 -21.868 .++ 600F,1350TBA 04 17:16 -99.6 68 439 476 .== 1350 2.884 15.234 18.748 .== 600F,1350TBAR43 5:16 95.1 -65 14 385 ..= 1200 -0.492 0.87 8.224 ..= 1200T,1200Q,1300T,1800F,1800TQBAR43 10:31 95.1 7 -22 -459 ..+ 1350 0.216 -0.254 -4.851 ..+ 1200T,1200Q,1300T,1800F,1800TQ

Circuit S/A PF RangeCaps on Ckt

(As per Cap Database)

Capacitor Analysis 9-1-2004 A thru GT.xls Comments

BR07 HOC 1200T, 1350QA phase & B phase failed to trip @5:01 & close @8:46, (1350?), check 1350 bank.

BR13 HOC 96.1-96.4450F, 600Q, 600TQ, 600TQ, 1200TQ, 1200T

A phase & B phase failed to trip @23:31 (600?) low PF, check all banks.

FD09 HOC 900Q, 1200TQ, 1350TQ, 1350T A phase failing on 900 bank; low PF check all banks.

FD15 HOC 900TQ, 900T A phase failed to close @14:46 & trip @22:16, (1200?), check all banks.

GN09 HOC 1200Q, 1200T A phase failing on 1200 bank, low PF, check all banks.

BY06 HUM 97.8-98.5 600Q, 600TQ, 600I, 1200QB phase & C phase failed to trip @5:01 & close @9:16, (1350?), check 1200 bank; A phase failed to close @10:16 & trip @22:01(600?) check all 600 banks.

AN06 MPK 96.4-98.8 1200T, 1200Q, 1200F A phase failed to trip @2:31 & close @9:31(1200?), check all banks.

BH06 MPK 600T, 1200TQB phase failed to close @6:01 & trip @18:01(600?), check 600 bank, also check clock.

CL01 MPK 1200F, 1350TQA phase failed to close @9:16 & trip @13:01(1350?), check 1350, low PF, check 1200F.

CL03 MPK 97.0-97.4 1200F, 1200TQB phase failed to trip @1:16 & close @10:46 (1200?), check 1200TQ, low PF, check 1200F.

Report Sent to Field Forces

Low Power Factor Report

·Pulls in power factor at peak, 4:46 PM, for every circuit on the system for 5 consecutive days.·Pulls in caps from capacitor database.·Calculates the theoretical power factor with all caps on, as well as the number of KVARS off-line.·The key is to look for circuits with a low power factor over those 5 days (less that 98%) and with a meaningful magnitude of KVARS off-line. ·There is no reason to send a crew to a circuit with a poor power factor if all of the caps are working, and there is no reason to send a crew to a circuit with excellent power factor even if some of the caps are off-line.

Friday 10/1/04

Friday 10/1/04

Friday 10/1/04

Friday 10/1/04

Monday 9/27/04

Tuesday 9/28/04 1-Oct 1-Oct 1-Oct 1-Oct Low PF Report on Sept 27 2004.xls

Fdr KW KVAR KVA PF PF PF

Est Vars w/out Caps

Est Vars w/

All Caps

Est PF

w/ All Caps

Vars Off Line

cap- sizes

Bank#1 Bank#2 Bank#3 Bank#4 Bank#5 Bank#6

AD 01 4,489 475 4514 99.4 99.8 99.6 2,245 -2,556 -87.0 3031 4800 1200Q 1200F 1200F 1200T 0 0

AD 02 5,850 -858 5913 -98.9 -99.0 -99.0 2,925 -1,275 -97.8 417 4200 600TQ 1200Q 1200F 1200TQ 0 0

AD 03 4,824 115 4825 100.0 99.8 99.9 2,412 12 100.0 103 2400 1200F 1200Q 0 0 0 0

AD 04 7,664 -2 7664 -100.0 99.5 99.3 3,832 -1,568 -98.0 1566 5400 450Q 600Q 600TQ 1200F 1200Q 1350Q

AD 05 4,979 36 4979 100.0 100.0 100.0 2,490 390 99.7 -354 2100 600Q 600F 900TQ 0 0 0

AD 06 8,607 599 8628 99.8 99.8 99.7 4,304 -497 -99.8 1096 4800 600TQ 600C 1200TQ 1200Q 1200F 0

AD 07 5,310 1,544 5530 96.0 95.7 95.2 2,655 855 98.8 689 1800 600Q 1200F 0 0 0 0

AD 08 6,222 -791 6272 -99.2 -98.2 -98.8 3,111 -489 -99.7 -302 3600 1200TQ 1200F 1200Q 0 0 0

AD 09 6,871 289 6877 99.9 100.0 100.0 3,436 136 100.0 154 3300 600F 600F 900Q 1200TQ 0 0

AN 01 6,553 -269 6559 -99.9 -99.7 -99.9 3,277 -174 -100.0 -96 3450 450TQ 600Q 1200F 1200I 0 0

AN 02 7,794 -55 7794 -100.0 -100.0 -100.0 3,897 -303 -99.9 248 4200 600Q 1200T 1200TQ 1200F 0 0

AN 03 3,752 1,111 3913 95.9 96.6 96.4 1,876 -374 -99.5 1485 2250 450F 900Q 900TQ 0 0 0

AN 04 6,718 1,779 6950 96.7 97.3 97.2 3,359 -541 -99.7 2320 3900 600F 900Q 1200T 1200TQ 0 0

AN 05 6,041 -425 6056 -99.8 -99.7 -99.6 3,021 -1,480 -97.1 1055 4500 600F 600TQ 900T 1200Q 1200TQ 0

AN 06 7,984 1,920 8212 97.2 97.6 97.0 3,992 392 99.9 1528 3600 1200T 1200Q 1200F 0 0 0

AN 07 5,930 376 5942 99.8 99.6 99.5 2,965 -635 -99.4 1011 3600 600F 900Q 900T 1200TQ 0 0

AN 08 5,715 196 5718 99.9 -100.0 -100.0 2,858 -143 -100.0 339 3000 600Q 1200T 1200F 0 0 0

AN 09 7,035 1,105 7121 98.8 99.3 98.9 3,518 -83 -100.0 1188 3600 600T 900F 900Q 1200TQ 0 0

AN 10 5,537 499 5559 99.6 99.9 99.6 2,769 -382 -99.8 881 3150 600T 1200T 1350Q 0 0 0

BG 01 2,391 584 2461 97.1 96.9 97.0 1,196 596 97.2 -12 600 600T 0 0 0 0 0

BG 02 5,161 742 5214 99.0 99.1 99.1 2,581 -120 -100.0 862 2700 600F 600T 600Q 900Q 0 0

BG 03 5,358 956 5443 98.4 97.6 97.8 2,679 1,479 96.5 -523 1200 1200T 0 0 0 0 0

BG 04 2,816 -418 2847 -98.9 -99.5 -98.6 1,408 208 99.7 -626 1200 1200TQ 0 0 0 0 0

BG 05 4,306 1,502 4560 94.4 94.4 94.8 2,153 953 97.9 549 1200 1200I 0 0 0 0 0

BG 06 4,810 946 4902 98.1 98.4 98.1 2,405 155 100.0 791 2250 450F 600Q 1200T 0 0 0

BG 07 4,792 1,388 4989 96.1 96.8 96.4 2,396 746 98.9 642 1650 450Q 600TQ 600F 0 0 0

BG 08 4,690 1,532 4934 95.1 95.2 95.3 2,345 1,745 94.3 -213 600 600I 0 0 0 0 0

BG 09 5,916 1,537 6112 96.8 96.8 97.3 2,958 1,758 96.1 -221 1200 600F 600Q 0 0 0 0

Circuit S/A PF Range

Max PF w/ All Caps

OnEst Vars Off-line

Caps on Ckt (As per Cap Database)

Capacitor Analysis - Low PF

9-27-2004 A thru MB.xls

Comments AD07 HUM 95.2-96.0 98.8 689 600Q, 1200F Low PF, check 600Q bank first.

ADK41 SPB/KTY 97.2-97.9 98.8 1300 1200F, 1200TQ, 1200Q, 1800QLow PF, check all banks, one bank not working.

AN03 MPK 95.8-96.6 -99.0 1400 450F, 900Q, 900TQ Low PF, check all banks.AN04 MPK 97.1-97.3 -99.0 2300 600F, 900Q, 1200T, 1200TQ Low PF, check all banks.AN06 MPK 97.0-97.6 100.0 1500 1200T, 1200Q, 1200F Low PF, check all banks.

BC09 FTB/WHA 93.7-94.6 100.0 700 450I, 600QLow PF, check all banks. Make sure current bank is coming on.

BG05 MPK 94.4-94.8 97.9 500 1200IMake sure current bank is operating properly.

BG07 MPK 96.4-96.8 98.9 600 450Q, 600TQ, 600F Low PF, check all banks.BI42 BEL 96.0-96.3 100.0 2300 1200TQ, 1200F, 1200T, 1200Q Low PF, check all banks.BI44 BEL 97.6-97.7 100.0 2900 1200Q, 1800F Low PF, check all banks.BI46 BEL 95.8-96.2 99.5 2800 900TQ, 1800TQ, 1800T, 1800F Low PF, check all banks.BR06 HOC 89.0-89.5 ? Low PF, check all banks.BU03 MPK 95.7-96.3 100.0 1900 600F, 900Q, 1350T Low PF, check all banks.BW06 BAY/CHV 93.1-93.9 ? Low PF, check all banks.CA01 SOH 96.5-96.8 100.0 1800 600T, 1200Q, 1400Q Low PF, check all banks.

CB06 SPB/KTY 97.3-97.6 100.0 800 900I, 900QLow PF, check all banks. Make sure current bank is coming on.

Report Sent to Field Forces

Results

·Piloted this effort during the 2nd half of 2004.·Good success rate.·In almost all cases, the crews were finding problems on the circuits identified.·Crews were entering their work into the Capacitor Database.·Needed to develop tracking mechanism and provide monthly reports on the progress of the crews.

Issues

·Needed to integrate this analysis effort into larger capacitor maintenance / capacitor construction program.·Issues:

·Capacitor crews & supervision had other priorities.·Work orders & construction of new capacitors was not timely.·Material shortages at certain times of the year (Long lead times on materials, plus inventory reduction).·New products such as vacuum switches & cutouts.·The creator of Capacitor Database left the company.

Capacitor Program

·Capacitor construction strategy·Capacitor material strategy·Capacitor maintenance strategy

Capacitor Construction Strategy

Established timeline for new capacitor construction:1. Identify & issue material requirements to Purchasing based on development plans by 9/12. Issue next year’s construction schedule by 9/13. Engineering to write work orders by 10/304. Material purchases to be driven by bill of materials on work orders via SAP5. CW Utilities to assemble materials in kits for each work order & deliver to S/C via cross-dock with central stores6. Complete construction by 3/317. Track orders via SAP (10/1 - 3/31)

Capacitor Construction Strategy

Benefits:Caps completed sooner in the year so crews will be available for maintenance as the weather warms up.(Previous focus was simply to get the banks built by 6/1)Materials for construction will ordered based on material requirements of work orders.Better utilization of materials since construction crews will not be taking the materials needed for maintenance or for other construction jobs.

Capacitor Material Strategy

Goal:Accurately identify material needs for new constructionAccurately identify material needs for maintenanceAcquire materials on a more timely basisUtilize better materials where necessary

Capacitor Material Strategy

Revised inventory purchase thresholds based on:1. Annual & monthly maintenance requirements (avg & peak values to account for weather impacts) 2. Lead time for each material

Perform monthly review of materials on hand, on order and at CW Utilities.Order specific materials if necessary.Establish metrics on material acquisition and usage to measure how effective we are on material strategy.

Capacitor Material Strategy

Metric: Fill rate = % of time material is available when you need it.

2004 overall fill rate was 84%Goal for capacitor materials is 98 - 100%Fill rate will be calculated for each material item

Capacitor Maintenance Strategy

·Established priorities for capacitor crews:1. Banks identified by Capacitor Analysis2. Banks identified by RCCS3. Switching orders for banks taken out of service4. Banks with hot spot identified by infra-red5. Field reports of banks out of service6. Construction for planned capacitor work7. Other work

·Held meetings with crews & their management to review priorities.·Established flow chart for entire maintenance process.

13Maintenance

Required?

Distribution Capacitor Maintenance

3PELCAR2000

Capacitor Monitoring System(CapSure &Bank Shot)

2Capacitor Outstanding Switching Orders

4Remote Control Capacitor

System (RCCS)

11Analysis

20Review Work Required, Prioritization

and Resources Avalaible

22Complete Work

6CapacitorDatabase

7SAP Budget

Reports

Yes

No5Distribution

SystemPerformance

Dis

trib

ution

Control

Auto

mat

ed

Sys

tem

s

Mai

nte

nan

ce

Anal

ysis

Fie

ld

Man

agem

ent

16Communicate to

Field Management

14AdditionalCapacitorsNeeded?

No

Yes

18Install

Capacitor?

19Communicate Need to Service AreaMgmt. for Work Order Preparation &

Installation

No

Yes

1Transmission System & Substation

PerformanceRea

l Tim

e

Oper

atio

ns

21Assign Work

Fie

ld

Per

sonnel

12Provide Periodic

ManagementReports

15Prioritize/Rank

Work

10Status of Planned

CapacitorConstruction

9Capacitors Off Line byEngineering Request

Const

ruct

ion &

Mat

eria

l

Anal

ysis

17Analysis

8Material Reports

Conclusion

·Implementation currently underway.·Will see how it works in the 2005 - 2006 season.