3.3 examples of large disturbances
TRANSCRIPT
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Date and Time Country Affectedload
Customers Causal Factors
Sept. 28, 2003 03:01 Italy ~28.000 MW ~ 60 Mio High imports of Italy;
transmission line faults inSwitzerland
Aug. 14, 2003 16:13 USA/Canada
61.800 MW ~ 50 Mio Transmission line faults;errors in SCADA/EMSsystem
Aug. 10, 1996 15:42 USA 28.000 MW 7.5 Mio Transmission line faults;
system oscillationsJuly 2, 1996 13:24 USA 11.800 MW 2.0 Mio Transmission line faults;
errors in relay system
July 23, 1987 13:19 Japan 8.200 MW 2.8 Mio Steep raise in systemload; voltage collapse
Dec. 27, 1983 12:57 Sweden 11.400 MW ~ 4 Mio Busbar fault
Dec. 12, 1978 08:26 France ~29.000 MW 15.6 Mio Unexpected high load
Nov. 9, 1965 17:16 USA ~20.000 MW ~30.0 Mio Incorrect relay settings
3.3.1
Major blackouts in recent years
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Europe by night
Europe by night
Sunday, 28.09.2003, 3:30
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Situation before outage
Impacts on Italy
Impacts on UCTE
3.3.3
Content
3.3 Examples of large disturbances
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Scheduled import to Italy 03:00 04:00: 6408 MW
Scheduled exchange programs 03:00 04:00
Switzerland Italy : 3068 MW
France Italy : 2650 MW
Slovenia Italy : 467 MW
Austria Italy : 223 MW
Situation before outage
3.3.43.3 Examples of large disturbances
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Physical import to Italy at 03:00: 6651 MW
Physical power flows at the border with Italy at 03:00
Switzerland Italy : 3610 MW
France Italy : 2212 MW
Slovenia Italy : 638 MW
Austria Italy : 191 MW
Situation before outage
3.3.53.3 Examples of large disturbances
Load in Italy at 03:00
Customer load 24064 MW
Load pump storage 3638 MWTotal load 27702 MW
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SloveniaSloveniaSlovenia
SwitzerlandSwitzerlandSwitzerland
AustriaAustriaAustria
Albertville
Rondissone
Villarodin Venaus
Gorduno
Airolo
Ponte
Pallan.
Mrel
Riddes
AviseValpelline
CamporossoLe Broc-Carros
Soazza
BulciagoMusig.
Sondrio
Robbia
Mese
Lienz
Soverzene
RedipugliaDivaca
Padriciano
Mettlen Sils
Lavorgo
Praz
La Coche
FranceFranceFranceCislago
3.3.63.3 Examples of large disturbances
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03:01:42 First line tripping: Lavorgo-Mettlen 400 kV;
Single phase to ground fault
3.3.7
03:10:47 Phone conversation between ETRANS and GRTN
to Request to reduce the Italian import03:21:00
03:25:21 Second line tripping: Sils-Soazza 400 kV;
Single phase to ground fault
03:25:25 Third line tripping: Airolo-Mettlen 220 kV
Overcurrent protection 03:25:27 Fourth and fifth line trippings: Riddes-Avise-Valpelline 220 kV
and Sondrio-Cislago 220 kV
03:25:30 Sixth line tripping: Albertville-Rondissone; No. 1; 400 kV
03:25:32 Seventh line tripping: Praz-La Coche 400 kV
03:25:33 Eighth line tripping: Albertville-Rondissone; No. 2; 400 kV
03:25:33 Ninth line tripping: Le Broc-Carros-Camporosso 220 kV
03:25:34 Tenth line tripping: Lienz-Soverzene 220 kV
Complete separation of the Italian grid
Sequence of events
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47,50
45.500
46.000
46.500
47.000
47.500
48.000
48.500
49.000
49.500
50.000
50.500
03:24:00
03:24:07
03:24:14
03:24:21
03:24:28
03:24:35
03:24:42
03:24:49
03:24:56
03:25:03
03:25:10
03:25:17
03:25:24
03:25:31
03:25:38
03:25:45
03:25:52
03:25:59
03:26:06
03:26:13
03:26:20
03:26:27
03:26:34
03:26:41
03:26:48
03:26:55
03:27:02
03:27:09
03:27:16
03:27:23
03:27:30
03:27:37
03:27:44
03:27:51
03:27:58
hour
H
z
Soazza-Sils
Outage
Separation from
European gridLoss of all power
plants operating at
distribution grid
~1.700 MW
Loss of 21 out of 50 main units before
the critical threshold ~3.700 MW
Load shedding (EAC) equal to ~600 MW
each (0,1 Hz) frequency loss; ~7.000 MW
automatic pumping
shedding ~3500 MW
critical
thresholdDefinitiv
Black-out
3:25 3:28~2,5 minutes
frequency
(Rome)
3.3.8
Frequency in Italy (09/28/2003)
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-2000
0
2000
4000
6000
8000
10000
12000
14000
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
time
MW
differenceplanned
actual value
Not supplied
Energy ~ 37 GWh
3.3.9
Restoration North Italy
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-1000
0
1000
2000
3000
4000
5000
6000
1 3 5 7 9 11 13 15 17 19 21 23 time
MW
Not supplied
Energy ~ 42 GWh
difference
planned
actual value
3.3.10
Restoration Middle Italy
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-1000
0
1000
2000
3000
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
time
MW
Not supplied
Energy ~ 21 GWh
difference
planned
actual value
3.3.11
Restoration South Italy
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49.95
50
50.05
50.1
50.15
50.2
Hz
50.3
03:00:00 03:14:24 03:28:48 03:43:12 03:57:36 04:12:00 04:26:24 04:40:48 04:55:12
Frequency in UCTE system on Su 28-09-2003 03:00 - 05:00
3.3.123.3 Examples of large disturbances