Path Rating Catalog 2013 - Western Electricity Coordinating Council

Revised November 2007
29. Intermountain - Gonder 230 kV
Accepted Rating
Existing Rating
Other
Location:
Definition:
Transfer Limit:
Critical
Disturbance
that limits the
transfer
capability:
Transmission line from Intermountain Power Facility (IPF) at Delta, Utah to
Gonder station in eastern central Nevada
A 144-mile 230 kV transmission line from the 230 kV IPF station to the
Mt. Wheeler Power Cooperative’s Gonder 230 kV station. The IPF 230 kV
station is connected to the IPF 345 kV station through a 300 MVA regulating
transformer. The IPF 345 and 230 kV stations are in the Los Angeles
Department of Water and Power (LADWP) control area, while the Gonder
230 kV station is in the Sierra Pacific Power Company’s control area.
East to West: 200 MW (non-simultaneous)
Studies to determine the simultaneous rating of this line with the Pavant-
Gonder 230 kV line are presently on-going.
The non-simultaneous rating is based on the rule-of-thumb criterion of
30 degree power angle difference between the sending and the receiving end,
and on N-0 load flow studies.
When: The 200 MW bidirectional non-simultaneous rating was established in 1987,
when the IPF was first put into service. This rating has been documented in
the WECC Operations Committee’s Non-Simultaneous Transfer Capability
Diagram as well as in the NERC Form OE-411, Item 5A reportings.
System
Conditions:
Study Criteria:
Remedial
Actions
Required:
Formal
Operating
Procedure:
Allocation:
Interaction
w/Other
Transfer Paths:
The non-simultaneous rating is based on the rule-of-thumb criterion of
30 degree power angle difference between the sending and the receiving end,
and on N-0 load flow studies.
WECC Reliability Criteria for System Design. (The applicable WECC
reliability criteria at that time.)
For disturbances where both of the IPF-Mona 345 kV lines are tripped, a
transfer trip protection trips the IPF-Gonder 230 kV line.
There is an established energization/synchronization procedure for the line to
control overvoltage conditions on the line. The IPF 230/345 kV regulating
transformer (ULTC) is under the LADWP SCADA system.
The following utilities have entitlements on this line:
LDWP, Anaheim, Riverside, Pasadena, Burbank and Glendale.
At the maximum flow conditions, the transfer capability of the line is
sensitive to the flows on the Pavant-Gonder 230 kV line. Simultaneous flow
capability of these two lines at the Gonder station cut-plane is presently under
going a study.
PART VI Item 1-82