Path Rating Catalog 2013 - Western Electricity Coordinating Council

77. Crystal – Harry Allen
Revised November 2007
Accepted Rating
Existing Rating
Other
Location:
Definition:
Southern Nevada
Sum of the flows on the two 500/230 kV transformer banks at Crystal
switching station, metered at the 500 kV bus.
Transfer Limit: Crystal to Harry Allen: 950 MW
Harry Allen to Crystal: Not defined
Critical
Disturbance
that limits the
transfer
capability:
When:
System
Conditions:
Study Criteria:
Remedial
Actions
Required:
Formal
Operating
Procedure:
Allocation:
Interaction
w/Other
Transfer Paths:
Contact Person:
Under conditions of maximum transfers from Harry Allen into the Las Vegas
Valley (i.e., all resources feeding into the Harry Allen substation at rated
capacity - Reid Gardner 1-4, H. Allen 3, Red Butte-Harry Allen 345 kV and
Crystal at 950 MW) the Pecos 230/138 kV autotransformers will be loaded to
a level where loss of the #3 or #4 bank will load the #1 bank to its emergency
rating (275.1 MVA).
The Crystal Transmission Project Phase 2 Review Group Report published in
February 1999 established the rating for the project. PCC formally approved
this rating in April 1999.
The Crystal-Allen 950 MW rating has been evaluated under peak summer
load conditions under maximum southern Nevada imports, and under heavy
autumn conditions with maximum EOR or WOR path flows.
WECC and Nevada Power Company Reliability Criteria for System Design
None
Operating and Clearance Procedures, Nevada Power Company - Crystal
Substation 500/230 kV, dated December 7, 1998.
The transfer capability is wholly owned by Nevada Power Company.
The Crystal progress report identified an interaction between the EOR and
WOR transfer paths. There is also an interaction with the Red Butte-H. Allen
345 kV line (TOT2C path) due to the Crystal and H. Allen phase shifter
interrelationship.
Edi Von Engeln
NV Energy
6100 Neil Road, M/S S3B40
Reno, Nevada 89511
(775) 834-4456
(775) 834-3047 - fax
evonengeln@nvenergy.com
PART VI Item 1-195