Path Rating Catalog 2013 - Western Electricity Coordinating Council

III-4. Path C (Post Gateway)
Revised January 2011
Accepted Rating
Existing Rating
Other
Location:
Definition:
Transfer Limit:
Critical
Disturbance
that limits the
transfer
capability:
Northern Utah/Southern Idaho
Sum of the flows on the following transmission lines:
Line
Malad- American Falls *138 kV
Ben Lomond-Populus *1 345 kV
Ben Lomond-Populus *2 345 kV
Treasureton-Sun Beam-Brady* 230 kV
Fish Creek – Goshen *161 kV
Terminal-Populus *345 kV
Three Mile Knoll 138/345* kV Transformer
Three Mile Knoll 138*/115 kV Transformer
North to South: 2250 MW (nominal)
South to North: 2250 MW (nominal)
Operating limits are based on both path rating studies and System Operating
Limit (SOL) studies.
Populus- Ben Lomond 345 kV #1 & #2
Populus- Ben Lomond 345 kV #1 & Terminal-Populus 345 kV.
When: Path rating granted January 5, 2011.
System
No limitations.
Conditions:
Study Criteria:
Remedial
Actions
Required:
Formal
Operating
Procedure:
• Steady state pre disturbance voltages between .95 p.u. and 1.05 p.u.
• Post-disturbance voltages between .90 p.u. and 1.10 p.u.
• Post-disturbance line loadings less than “emergency ratings.”
• First-swing transient voltage dips not to exceed .80 p.u.
Northbound: Seperation of the 138 kV system between Ben Lomond and
Treasureton and the 138 kV tie to American Falls. Additional studies will be
performed to refine the optimal location.
Southbound: None
Defined
Allocation:
100% PacifiCorp
PART VI Item 1-220