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Distribution network fault on LHC1 10/07/2011

Distribution network fault on LHC1 10/07/2011 F Duval, G Cumer on behalf of EN/EL 10/07/11. 1) FACTS. 1) FACTS. 3 major events in 30 min (11:03, 11:11, 11:34) Discrimination not easy but last was worst (short on Verbois OHL)

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Distribution network fault on LHC1 10/07/2011

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  1. Distribution network fault on LHC1 10/07/2011 F Duval, G Cumer on behalf of EN/EL 10/07/11

  2. 1) FACTS

  3. 1) FACTS • 3 major events in 30 min (11:03, 11:11, 11:34) • Discrimination not easy but last was worst (short on Verbois OHL) • Impact on several points (starting contact: EHT2 pulsed, Diesel network, Meyrin admin. loop) • False intertrip on MP7 (second in a row after 3 month of storms) • Autotransfer failed to refeed SEM12 (Io on couplers)

  4. 1) FACTS

  5. 1) FACTS • Situation after autotransfert 11:34:48 • All machines off • LHC loop and ATLAS partially off • MEYRIN reenergized from Swiss network • DIESEL generators started well on all LHC points • Situation after Piquet reconfiguration 13:50 • Piquet at work at 12:15 (difficult to understand) • fail to refeed loop from LHC2 ( Io) at 12:58 • LHC loop fed from LHC2 (in two steps) 13:28 • ATLAS fully refed at 13:49 • Network back to the standard configuration at 16:00

  6. 1) FACTS

  7. 2) ANALYSIS • Another false intertrip on MP7 • second in a row after 3 months of storm seasons • intertrip will be deactivated ASAP • Fiber optics will be installed for intertrips • Io twice attempting to reenergized SEM12 (LHC loop + ATLAS) • No explanation yet • Unexpected and complex situation for Standby service • 2h15 before renergizing LHC1 (too long)

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