Path Rating Catalog 2013 - Western Electricity Coordinating Council

Revised December 2010
54. Coronado-Silver King 500 kV
Accepted Rating
Existing Rating
Other
Location:
Definition:
Eastern Arizona
Sum of flows on the following transmission lines:
Line
Metered End
Coronado-Silver King 500 kV Coronado
Transfer Limit: Coronado to Silver King: 1494 MW
Silver King to Coronado: Not rated
Critical
Disturbance
that limits the
transfer
capability:
When:
System
Conditions:
The critical disturbance is loss of the Coronado-Silver King 500 kV line
which causes the Cholla-Preacher Canyon 345 kV line to reach the
emergency rating with the Coronado Unit 2 tripping.
On March 12, 2007, Salt River Project (SRP) initiated the Rating Review
Process for Path 54 (Coronado-Silver King 500 kV line) with an accepted
rating of 1494 MW associated with the addition of Springerville Unit # 4.
Phase II status was granted by TSS on June 20, 2007. The Accepted Rating
was approved by the PCC Chairman on November 15, 2007.
2008 Heavy Summer conditions. Pre and Post- Springerville #4 benchmark
cases were developed in which the eastern Arizona transmission paths were
stressed until a thermal, stability or post-transient limit was reached.
However, the accepted rating will be valid under all system conditions.
NERC/WECC Reliability Criteria For Transmission System Planning
Coronado Unit 2 tripping for the critical outage of the Coronado-Silver King
500 kV line.
Study Criteria:
Remedial
Actions
Required:
Formal
Operating
Procedure:
Allocation:
Interaction
w/Other
Transfer Paths:
Contact Person: John Hernandez, POB 100
Salt River Project
P.O. Box 52025
Phoenix, AZ 85072-2025
(602) 236-0968
(602) 236-3896 - fax
e-mail address:
johnny.hernandez@srpnet.com
Coronado-Silver King line operating procedure #45407. Additional operating
procedures may be required and will be developed in the future.
Salt River Project
Potential interaction with Path 22. If necessary, possible Path 22/Path 54
operating nomogram limits will be developed.
PART VI Item 1-151