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ISO New England Operations Significant Events December 2003 January 2004. NEPOOL Reliability Committee February 3, 2004. Significant Events. 12/5 Declaration of OP4 Conditions 1/14 Declaration of OP4 Conditions 12/6 Loss of Salem Harbor Station. - PowerPoint PPT Presentation
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1
ISO New England OperationsSignificant Events
December 2003January 2004
NEPOOL Reliability Committee
February 3, 2004
2
Significant Events
• 12/5 Declaration of OP4 Conditions
• 1/14 Declaration of OP4 Conditions
• 12/6 Loss of Salem Harbor Station
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Declaration of OP4 ConditionsDecember 5, 2003
4
Dec. 5 OP4 Conditions
Initial Conditions (from morning report)
Installed generating capacity 33,024
Generation outages & reductions 5,362
External purchases 497
Operating reserve requirement 1,735
Peak load forecast for hour 18 19,375
Surplus 928
5
Dec. 5 OP4 Conditions
Events Contributing to OP4
• 16:13 – Millenium tripped due to low boiler level.
• 16:42 – Lake Road #1 tripped.
• 16:53 – Mystic 7 tripped due to an ID fan problem.
• System load 500MW over forecast.
6
Dec. 5 OP4 Conditions
OP4 Trigger
Maintenance crews at Yarmouth station were draining down the air system on breaker KG4/386 due to a compressor problem. At 17:25 low air pressure triggered a breaker failure lockout, transfer tripping the 391/386 and K386-4 breakers at Buxton, the KT1L breaker at South Gorham and the Yarmouth 4 generator.
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Dec. 5 OP4 Conditions
• Instantaneous Capacity deficiency about 500MW
• 17:30 - M/S#2 declared
• 17:30 - OP#4 actions 1&6 implemented.
• Total available relief from actions 1&6: 575MW
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Dec. 5 OP4 Conditions
Conditions improve
• 19:52 – The 386 line returned to service
• 20:00 – All actions of Op#4 are cancelled
• 21:00 – MS#2 cancelled
9
Dec. 5 OP4 Conditions
Peak hour capacity analysis
Installed generating capacity 33,024
Generation outages & reductions 6,368
External purchases 497
Operating reserve requirement 1,741
Peak load for hour 18 19,822
Surplus -363
10
Declaration of OP4 ConditionsJanuary 14, 2004
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Jan. 14 OP4 Conditions
Initial Conditions (from morning report)
Installed generating capacity 32,637
Generation outages & reductions 8,439
External purchases -37
Operating reserve requirement 1,735
Peak load forecast for hour 18 21,975
Surplus 718
12
Jan. 14 OP4 Conditions
Morning. events
• Multiple units reduced or OOS due to gas restrictions or freezing problems.
• Evening peak load forecast raised 500 MW.
• ISO anticipating 30 minute reserve deficiencies over the evening peak cancels all economic outages & recalls 342 line (Canal, Pilgrim, Auburn St.)
13
Jan. 14 OP4 Conditions
Afternoon events
• 12:00 - M/S#2 declared for all Satellites
• 13:30 - New Brunswick, TransEnergie all forecast 30 minute reserve deficiencies over the evening peak.
• Restoration of 342 line delayed to difficulties reconnecting line leads. (550 Mw restriction on Canal generation)
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Jan. 14 OP4 Conditions
Evening events
• 17:00 – OP#4 actions 1&6 implemented.
• 17:34 – Generator posturing initiated to maintain total 10 minute reserves.
• 18:17 – 342 line restored.
• 18:33 – Posturing cancelled.
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Jan. 14 OP4 Conditions
Evening events
• 19:00 – All actions of OP#4 are cancelled.
• M/S#2 maintained until January 17th, 11:00.
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Jan. 14 OP4 Conditions
Peak hour capacity analysis
Installed generating capacity 32,637
Generation outages & reductions 9,323
External purchases 401
Operating reserve requirement 1,740
Peak load for hour 18 22,450
Surplus -108
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Loss of Salem Harbor StationDecember 6, 2003
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Dec. 5 L/O Salem Harbor
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Dec. 6 L/O Salem Harbor
20:27• Fault occurs on the 22-46 circuit breaker at Salem Harbor.
• T146 line & S145 terminal at Salem Harbor lock out.
• Close in fault caused #1&2 transformer & #1 bus
• differential relays to lock out all associated circuit breakers
• Salem Harbor 1&2 trip.
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Dec. 6 L/O Salem Harbor
• 20:37 - Salem Harbor 3 tripped, 33-54 & 33T CBs open. B154 now open ended and C155 radial to #2 bus.
• 20:44 - #2 bus de-energized.
• 21:37 - 22-46 CB isolated, T146 line shot & closed in.
• 21:41 - #2 bus energized & some SS load picked up.
• 21:53 – S145, B154, C155 closed in. Salem units receive permission to restart.
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Dec. 6 L/O Salem Harbor
Summary• 75 MW of area load lost.
• 313 MW of generation lost at Salem Harbor
• 23:44 - all area load restored
• No stability or thermal overloads occurred.