Path Rating Catalog 2013 - Western Electricity Coordinating Council

24. PG&E - Sierra
Revised February 2001
Accepted Rating
Existing Rating
Other
Location:
Definition:
Transfer Limit:
Critical
Disturbance
that limits the
transfer
capability:
When:
System
Conditions:
Study Criteria:
Remedial
Actions
Required:
Formal
Operating
Procedure:
Allocation:
Interaction
w/Other
Transfer Paths:
Between Northern California and Nevada
Drum-Summit (2-115 kV lines)
Spaulding-Summit (1-60 kV line)
Sum of the flows on the following transmission lines:
Line
Metered Point
Drum-Summit 1 115 kV
Summit 1 115 kV bus
Drum-Summit 2 115 kV
Summit 2 115 kV bus
Drum-Summit 60 kV
Summit 60 kV bus
160 MW West to East
150 MW East to West
Transfer limit may vary from 0-160 MW depending on generation and load in
the Drum-Rio Oso-Goldhill area. East to west limit based on N. Tahoe loads
and Cal Sub phase shifter.
Loss of the Drum Powerhouse
Loss of Drum-Rio Oso #1 (115 kV)
Loss of Drum-Summit 1&2
Goldhill-Placer #2 (115 kV)
Halsey Jct-Newark #1 & #2 (between Drum and Placer)
Heavy Summer
Heavy Winter
All facilities loaded within normal ratings under normal system conditions.
All facilities loaded within emergency ratings under outage conditions.
Fully meets WECC Reliability Criteria in effect at time rating was
established.
Open Drum-Summit lines.
For NE/SE separation, opening of the PG&E-Sierra tie lines is required.
Open Drum-Atlantic 60 kV line at Weimer.
Sierra, PG&E
Affected by flow at California-Oregon border.
The flow on the Midpoint-Humboldt line affects the scheduling capability of
this path.
PART VI Item 1-67