1. TONBRIDGE POWER GREEN LINE
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110899
TONBRIDGE POWER GREEN LINE
PLAN OF SERVICE
PE&C1099.ppt

2. TONBRIDGE POWER GREEN LINE
WECC VOLTAGE CRITERIA
SYSTEM INTACT CONDITIONS:
MAXIMUM PER UNIT
MINIMUM PER UNIT
N-1 CONTINGENCY CONDITIONS:
MAXIMUM PER UNIT
MINIMUM PER UNIT
POST CONTINGENCY CONDITIONS:
ALL VOLTAGE CHANGES < 0.02 PER UNIT OF PRE-CONTINGENCY LEVEL FOR:
230 KV BUSES BELOW 0.90 PER UNIT
500 KV BUSES BELOW 1.00 PER UNIT

3. TONBRIDGE POWER GREEN LINE
WECC TRANSMISSION INTERCONNECTION CRITERIA
N-1 CONTINGENCY CONDITIONS:
POWER SYSTEM SHALL BE OPERATED AT ALL TIMES SO THAT GENERAL SYSTEM INSTABILITY, UNCONTROLLED SEPARATION, CASCADING OUTAGES AND/OR VOLTAGE COLLAPSE WILL NOT OCCUR AS THE RESULT OF THE LOSS OF A SINGLE SYSTEM ELEMENT

4. TONBRIDGE POWER GREEN LINE

5. TONBRIDGE POWER GREEN LINE

6. TONBRIDGE POWER GREEN LINE
PLAN 3 – TONBRIDGE SS to GARRISON 230KV
System Performance – Voltage Impacts
System Intact: – No Significant Voltage problems
N-1 Contingencies:
Outage of Garrison-Taft 1 & 2, 500 kV Lines with Colstrip ATR
With 950 MW WTG on-line – No significant Voltage Impacts
Outage of Townsend-Garrison 1 & 2, 500 kV Lines with Colstrip ATR

7. TONBRIDGE POWER GREEN LINE
PLAN 3 – TONBRIDGE SS to GARRISON 230KV
System Performance – Impacts on Area Transmission Facilities
System Intact: – No Significant Line Loading problems
N-1 Contingencies:
Outage of Garrison-Taft 1 & 2, 500 kV Lines with Colstrip ATR
With 950 MW WTG on-line – Overloaded Hot Springs 500/230 kV transformer 117 %
Trip 300 MW WTG at Hay Lake – Hot Springs 500/230 kV transformer still overloaded 104 %
Trip 650 MW WTG from Renewable Collector System (RCS) WTG – No significant increases on overloaded area facilities

8. TONBRIDGE POWER GREEN LINE
PLAN 3 – TONBRIDGE SS to GARRISON 230KV
System Performance – Impacts on Area Transmission Facilities
System Intact: – No Significant Line Loading problems
N-1 Contingencies:
Outage of Townsend-Garrison 1 & 2, 500 kV Lines with Colstrip ATR
With 950 MW WTG on-line – No significant increases on overloaded area facilities
Trip 300 MW WTG at Hay Lake – No significant increases on overloaded area facilities
Trip 650 MW WTG from Renewable Collector System (RCS) WTG – No significant increases on overloaded area facilities

9. TONBRIDGE POWER GREEN LINE
PLAN 3

10. TONBRIDGE POWER GREEN LINE

11. TONBRIDGE POWER GREEN LINE
PLAN 3A – TONBRIDGE SS to GARRISON 230KV
System Performance – Voltage Impacts
System Intact: – No Significant Voltage problems
N-1 Contingencies:
Outage of Garrison-Taft 1 & 2, 500 kV Lines with Colstrip ATR
With 300 MW WTG on-line and 300 MW Transfer from Alberta – No significant Voltage Impacts
Outage of Townsend-Garrison 1 & 2, 500 kV Lines with Colstrip ATR
With 950 MW WTG on-line and 300 MW Transfer from Alberta – No significant Voltage Impacts

12. TONBRIDGE POWER GREEN LINE
PLAN 3A – TONBRIDGE SS to GARRISON 230KV
System Performance – Impacts on Area Transmission Facilities
System Intact: – No Significant Line Loading problems
N-1 Contingencies:
Outage of Garrison-Taft 1 & 2, 500 kV Lines with Colstrip ATR
With 300 MW WTG on-line and 300 MW Transfer from Alberta – No significant increases on overloaded area facilities

13. TONBRIDGE POWER GREEN LINE
PLAN 3A – TONBRIDGE SS to GARRISON 230KV
System Performance – Impacts on Area Transmission Facilities
System Intact: – No Significant Line Loading problems
N-1 Contingencies:
Outage of Townsend-Garrison 1 & 2, 500 kV Lines with Colstrip ATR
With 300 MW WTG on-line and 300 MW Transfer from Alberta – No significant increases on overloaded area facilities

14. TONBRIDGE POWER GREEN LINE
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110899
TONBRIDGE POWER GREEN LINE
PLAN 3A
PE&C1099.ppt 14

15. Tonbridge Switching Station
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110899
TONBRIDGE POWER GREEN LINE
Tonbridge Switching Station
PE&C1099.ppt 15