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August 7, 2003 Loss of Load / Generation Event in Rio Grande Valley

August 7, 2003 Loss of Load / Generation Event in Rio Grande Valley. SIMPLIFIED ONELINE. MVEC GEN. SE Edinburg. HEC SS. CTG1. STG3. CTG2. 1400. 1425. North Edinburg. 1405. 1420. 4350. 5000. 4655. 5030. 5020. 1410. 1415. Aderhold. 4345. 5010. 5015. 5035. 5025. 1360.

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August 7, 2003 Loss of Load / Generation Event in Rio Grande Valley

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  1. August 7, 2003Loss of Load / Generation Event in Rio Grande Valley

  2. SIMPLIFIED ONELINE MVEC GEN SE Edinburg HEC SS CTG1 STG3 CTG2 1400 1425 North Edinburg 1405 1420 4350 5000 4655 5030 5020 1410 1415 Aderhold 4345 5010 5015 5035 5025 1360 HEC GEN CTG1 STG3 CTG2

  3. SIMPLIFIED ONELINE – 14:23:15.00 MVEC GEN SE Edinburg HEC SS CTG1 STG3 CTG2 1400 1425 North Edinburg 4820 amps 37095 amps 1405 1420 4350 5000 4655 5030 5020 1410 1415 Aderhold 4345 5010 5015 5035 5025 18,447 amps 1360 HEC GEN CTG1 STG3 CTG2 • C Phase to Ground Fault – Surge Arrestor on Line Failed

  4. MVEC GEN HEC SS CTG1 STG3 CTG2 1400 1425 North Edinburg 1405 1420 4350 5000 4655 5030 5020 1410 1415 4345 5010 5015 5035 5025 1360 HEC GEN CTG1 STG3 CTG2 SIMPLIFIED ONELINE – 14:23:15.05 SE Edinburg Aderhold • 14:23:15.05 15:23:16 N. Ed. To HEC Tripped (1)

  5. Unit Trip 138 KV Line 69 KV Line 138 KV Load 69 KV Load SYSTEM ONELINE - 15:23:16 • 14:23:15.05 15:23:16 N. Ed. To HEC Tripped (1)

  6. SE Edinburg MVEC GEN HEC SS CTG1 STG3 CTG2 1400 1425 North Edinburg 12037 amps 41340 amps 1405 1420 Aderhold 4350 5000 4655 5030 5020 1410 1415 4345 5010 5015 5035 5025 1360 HEC GEN CTG1 STG3 SIMPLIFIED ONELINE – 14:23:15.59 CTG2 • 14:23:15.59 15:23:18 N. Ed. To HEC Closed

  7. MVEC GEN HEC SS CTG1 STG3 CTG2 1400 1425 North Edinburg 1405 1420 4350 5000 4655 5030 5020 1410 1415 4345 5010 5015 5035 5025 1360 HEC GEN CTG1 STG3 CTG2 SIMPLIFIED ONELINE – 14:23:15.66 SE Edinburg Aderhold • 14:23:15.66 15:23:18 N Ed To HEC Tripped (2)

  8. SE Edinburg MVEC GEN HEC SS CTG1 STG3 CTG2 1400 1425 North Edinburg 1405 1420 Aderhold 4350 5000 4655 5030 5020 1410 1415 4345 5010 5015 5035 5025 1360 HEC GEN CTG1 STG3 CTG2 SIMPLIFIED ONELINE – 14:23:15.68 • 14:23:15.68 15:23:18 HEC STG #3 Tripped 15:23:18 Santa Rosa, Pharr, N. McAllen, Polk Ave 12KV Load Tripped 15:23:18 Bates 69KV Tripped

  9. Unit Trip 138 KV Line 69 KV Line 138 KV Load 69 KV Load SYSTEM ONELINE - 15:23:18 • 14:23:15.68 15:23:18 HEC STG #3 Tripped 15:23:18 Santa Rosa, Pharr, N. McAllen, Polk Ave 12KV Load Tripped 15:23:18 Bates 69KV Tripped

  10. Unit Trip 138 KV Line 69 KV Line 138 KV Load 69 KV Load SYSTEM ONELINE - 15:23:20 • 15:23:20 Hall Acres 12KV Load Tripped • 15:23:20 Bates 69KV Closed

  11. Unit Trip 138 KV Line 69 KV Line 138 KV Load 69 KV Load SYSTEM ONELINE - 15:23:22 & 24 • 15:23:22 Bates 69KV Tripped • 15:23:24 Pharr 12KV Load Tripped & Closed

  12. Unit Trip 138 KV Line 69 KV Line 138 KV Load 69 KV Load SYSTEM ONELINE - 15:23:26 • 15:23:26 Bates 69KV Closed 15:23:26 S. McAllen To N. McAllen Tripped 15:23:26 S McAllen 12KV Load Tripped 15:23:26 N McAllen 12KV Load Tripped & Closed

  13. Unit Trip 138 KV Line 69 KV Line 138 KV Load 69 KV Load SYSTEM ONELINE - 15:23:28 • 15:23:28 Hall Acres 12KV Load Tripped 15:23:28 S. McAllen To N. McAllen Closed

  14. SE Edinburg Aderhold SIMPLIFIED ONELINE – 14:23:25.65 MVEC GEN HEC SS CTG1 STG3 CTG2 1400 1425 North Edinburg 7170 amps 39813 amps 1405 1420 4350 5000 4655 5030 5020 1410 1415 4345 5010 5015 5035 5025 1360 HEC GEN CTG1 STG3 CTG2 • 14:23:25.65 15:23:30 N. Ed. To HEC Closed14:23:25.74 15:23:30 N. Ed to HEC Tripped (3)14:23:25.76 15:23:30 N. Ed. To MVEC Tripped (CTG1)

  15. SE Edinburg MVEC GEN HEC SS CTG1 STG3 CTG2 1400 1425 North Edinburg 1405 1420 Aderhold 4350 5000 4655 5030 5020 1410 1415 4345 5010 5015 5035 5025 1360 HEC GEN CTG1 STG3 CTG2 SIMPLIFIED ONELINE – 14:23:25.74 • 14:23:25.65 15:23:30 N. Ed. To HEC Closed14:23:25.74 15:23:30 N. Ed to HEC Tripped (3)14:23:25.76 15:23:30 N. Ed. To MVEC Tripped (CTG1)

  16. SE Edinburg MVEC GEN HEC SS CTG1 STG3 CTG2 1400 1425 North Edinburg 1405 1420 Aderhold 4350 5000 4655 5030 5020 1410 1415 4345 5010 5015 5035 5025 1360 HEC GEN CTG1 STG3 CTG2 SIMPLIFIED ONELINE – 14:23:25.76 • 14:23:25.65 15:23:30 N. Ed. To HEC Closed14:23:25.74 15:23:30 N. Ed to HEC Tripped (3)14:23:25.76 15:23:30 N. Ed. To MVEC Tripped (CTG1)

  17. Unit Trip 138 KV Line 69 KV Line 138 KV Load 69 KV Load SYSTEM ONELINE - 15:23:30 • 14:23:25.65 15:23:30 N. Ed. To HEC Closed14:23:25.74 15:23:30 N. Ed to HEC Tripped (3)14:23:25.76 15:23:30 N. Ed. To MVEC Tripped (CTG1)

  18. Unit Trip 138 KV Line 69 KV Line 138 KV Load 69 KV Load SYSTEM ONELINE - 15:23:38 • 15:23:38 Various 12KV Feeders Tripping & Closing over 15 Minute period.

  19. SE Edinburg MVEC GEN HEC SS CTG1 STG3 CTG2 1400 1425 North Edinburg 1405 1420 Aderhold 4350 5000 4655 5030 5020 1410 1415 4345 5010 5015 5035 5025 1360 HEC GEN CTG1 STG3 CTG2 SIMPLIFIED ONELINE – 14:37:21.97 • 14:37:21.97 15:37:30 MVEC CTG2 Tripped

  20. SE Edinburg MVEC GEN HEC SS CTG1 STG3 CTG2 1400 1425 North Edinburg 1405 1420 Aderhold 4350 5000 4655 5030 5020 1410 1415 4345 5010 5015 5035 5025 1360 HEC GEN CTG1 STG3 CTG2 SIMPLIFIED ONELINE – 14:37:28.94 • 14:37:28.94 MVEC STG3 Tripped

  21. Unit Trip 138 KV Line 69 KV Line 138 KV Load 69 KV Load SYSTEM ONELINE - 15:37:30 & 15:45 • 14:37:21.97 15:37:30 MVEC CTG2 Tripped • 14:37:28.94 MVEC STG3 Tripped • 15:45 Found blown Surge Arrester at North Edinburg

  22. HEC GTG1 (1) -8.4 MVARS +135.9 MVARS

  23. HEC GTG2 (1) +190.5 MVARS +81 MVARS

  24. HEC STG3 (1) -109.7 MVARS +10.2 MVARS

  25. MVEC CTG1 (1) +370 MVARS +176 MVARS

  26. Total Load Loss Approximately 375 MW of load loss. (From 4650 MW to 4275 MW.)

  27. Two AEP Totalizers Tripped Feeder Trip Summary 300 amps 100 amps 100 amps 100 amps 22 AEP Feeders Tripped across Valley Sympathetic Tripping -most by ground over current, a few by under voltage relay

  28. Transmission Issues Found • 138 KV N. Ed 1 reclosed one more time than design Found wrong setting on SEL279 & Corrected • 138 KV N. McAllen to S. McAllen Overtripped Found closed ground switch on carrier & Corrected • 69KV Bates to N. Ed Tripped Blown PT fuse replaced. • North Alamo Totalizer Ground tripped due to Sypathetic Trip Ground settings reviewed and increased • Polk Ave Totalizer Ground tripped due to Sypathetic Trip Ground settings reviewed and increased

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