subduction zone earthquakes: recent electric utility
TRANSCRIPT
SUBDUCTION ZONE EARTHQUAKES: RECENT ELECTRIC UTILITY EXPERIENCE
2010
2011
TIME HISTORIES
(Chopra/Hudson)
M4.5
M6.2
M6.5
M6.7
M7.1
M7.8
M8.1
M7.1
M6.2
M6.3
M5.2
M6.6
M5.8
M4.1
Chile M8.8 February 27, 2010
Great Historic Earthquakes in Chile
1575 Valdivia 8.51730 Valparaiso 8.71751 Concepción 8.51835 Concepción 8.51868 Arica 9.01906 Valparaíso 8.21922 Vallenar 8.51943 Coquimbo 8.21960 Valdivia 9.51985 Santiago 8.01995 Antofagasta 8.0
2010 Maule 8.8
SUBSTATION CONTROL HOUSESNONSTRUCTURAL ISSUES
FLEXIBLE BUS SUBSTATION
RIGID BUS SUBSTATION
DAMAGE SUMMARYEquipment 500 kV 220 kV 154 kV 110 kV 66 kV StationTransformer Bushings 9 20Transformers Internal 4Buchholz Relay fitting 4 1Air Blast Cir. Breaker 1 1 2Candlestick Circuit Breaker 1 2 4SF6 Live-Tank Circuit Breaker 4 1Surge Arrester 2 2 1Potential Transformer 2 1 1Current Transformer 3Pantograph DCS 7 1Rigid Bus on Frame 3 sitesBus Support Str. - tilt 2Disconnect Switch 1Control Room Ceiling 2
SUBSTATION SITES MOSTLIKEY EXPERIENCED APPROX. 0.3G MAXIMUM
TRANSFORMER
BUSHING
Transelec
SURGE ARRESTER
500 kV Live Tank Circuit Breaker
CURRENT TRANSFORMER
Transelec
RIVERCROSSING TOWERS
Foundation Failure
Japan M9.0 EarthquakeMarch 11, 2011
ACCELERATION TIME HISTORY
Hydro Power Plants (209) 10 2 7Thermal Power Plants (8) 4Nuclear Power Plants (2) 1
SUBSTATIONS (612, 500-275-154kV) 57 19 4 • Transformers 70 15 1• Circuit Breakers 197 15 1• Disconnect Sw’s and other Equip. 179 0 2
TRANSMISSION LINES 105 12 15• Towers 42• Insulators 22 5 5• Underground lines 14
DISTRIBUTION• Poles 23,649 6,411 566• Lines 23,543 11,517 1,084• Transformers 7,114 2,183 121
FACILITIES (TOHOKU ELECTRIC) 3/11 4/7 4/11 & 12
HIGH VOLTAGE SUBSTATIONS
BRIDGES April 2011
POWER TRANSFORMER FAILURES: Significant issue for transmission line system
Reported FailuresM9 M7.2 M7.1/M6.3
(3/11/11) (4/7/11) (4/11-12/11)
47Shaking 15Shaking 1Shaking
23Tsunami
The End