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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) - PowerPoint PPT Presentation
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Distribution network fault on LHC110/07/2011
F Duval, G Cumer on behalf of EN/EL 10/07/11
EHT1
LHC2,4,5/6,8
110MVA110MVA 90MVA 90MVA
70MVA
70MVA
ZN
60MVA
MP560MVA
130kV EOS
SEM12
MP730MVA
LHC
PULSE SPS
MP630MVA
ATLAS / LHC1.8
63MVA
MEY PS Stable
18kV
18kV66kV
18kV
18kV
ATLAS / LHC1.8
18kV SW ME59
ISOLDEPS Pulsed
bpn
Configuration before fault 10/07/11 11h
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)
1) FACTS
EHT1
LHC2,4,5/6,8
110MVA110MVA 90MVA 90MVA
70MVA
70MVA
ZN
60MVA
MP560MVA
130kV EOS
SEM12
MP730MVA
LHC
PULSE SPS
MP630MVA
ATLAS / LHC1.8
63MVA
MEY PS Stable
18kV
18kV66kV
18kV
18kV
ATLAS / LHC1.8
18kV SW ME59
ISOLDEPS Pulsed
bpn
Configuration after fault and Autotransfert 10/07/11 11h 351) 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
1) FACTS
EHT1
LHC2,4,5/6,8
110MVA110MVA 90MVA 90MVA
70MVA
70MVA
ZN
60MVA
MP560MVA
130kV EOS
SEM12
MP730MVA
LHC
PULSE SPS
MP630MVA
ATLAS / LHC1.8
63MVA
MEY PS Stable
18kV
18kV66kV
18kV
18kV
ATLAS / LHC1.8
18kV SW ME59
ISOLDEPS Pulsed
bpn
Configuration after standby reconfiguration 10/07/11 13h 501) FACTS
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)
