Path Rating Catalog 2013 - Western Electricity Coordinating Council
Path Rating Catalog 2013 - Western Electricity Coordinating Council Path Rating Catalog 2013 - Western Electricity Coordinating Council
25. PacifiCorp/PG&E 115 kV Interconnection Revised January 2013 Accepted Rating Existing Rating Other Location: Southern Oregon/Northern California (Line 14) Definition: Sum of flow on Line 14, measured at Cascade. Transfer Limit: Winter Summer North to South: 100 MW * 80 MW South to North: 45 MW ** 45 MW ** The thermal rating of this 115 kV line is 100/149 MVA Summer/Winter (397.5 ACSR conductor). Critical Disturbance that limits the transfer capability: When: System Conditions: Study Criteria * Due to load growth in the area, there are periods when the winter transfer limit may be reduced below 100 MW, sometimes as low as 80 MW. ** The south to north non-simultaneous rating listed in the WECC Transfer Capability Diagram is 45 MW. This capability is rated under tie-line open south of phase shifter and is equivalent to the magnitude of PacifiCorp’s local area load. Path rating was established on April 19, 1984 with the publishing of the WECC progress report, by project owners. The powerflow and stability studies deriving the path rating, above, were conducted by PacifiCorp and PG&E. This interconnection operates in parallel with the California-Oregon Intertie (COI). In order to direct flow of the 100 MW south on Line 14, a 75/100/125 MVA, 118 kV 0-60 degrees compensated phase shifter is installed at PacifiCorp’s Weed Junction substation, Weed Junction, California. This phase-shifting transformer regulates the flow of power, preventing power scheduled over it from flowing on the COI. The following stability simulations were made: A. Islanding Without the Line 14, 115 kV Tie This simulation assumes 3200 MW on the COI as well as 4163 MW on the Arizona to southern California path and indicates that minimum standards for stable operation can be achieved, complying with WECC criteria. Stability plot of the Devers 500 kV bus shows oscillations of increasing amplitude through the first 7-8 seconds, with decreasing amplitude thereafter. The minimum transient swing voltage was at the Devers 230 kV bus with 81.7%. Use of the SDG&E’s Damping Coefficient Method demonstrates a 7.6% damping on this bus. Frequencies drop to 58.84 Hz minimum in California causing some under-frequency load shedding. PART VI Item 1-70
Study Criteria (continued) Remedial Actions Required: Formal Operating Procedure: Allocation: Interaction w/Other Transfer Paths: Contact Person: B. Islanding With the PAC-PG&E 115 kV Tie This simulation assumes the addition of 100 MW on the existing Line 14, 115 kV Tie. This increase indicates that the minimum transient swing voltage at Devers would drop from 81.7% to 79.5% or a 2.2% reduction. In addition to standard protection, a thermal relay is installed at Cascade and out-of-step indication is installed at Weed Junction. In the event of islanding, Line 14 is tied into the relaying and communication of the WECC “islanding” scheme. It is to be tripped approximately six cycles after the 3-line loss of the COI. PacifiCorp is the operating agent and uses real-time flows to monitor this path. The entire path transfer capability is owned by PacifiCorp. No interaction with other WECC paths. However, transfer capability could be limited at times due to local loads. Larry Frick PacifiCorp, Transmission Planning Lloyd Center Room 1800 825 NE Multnomah Portland, OR 97232 (503) 813-6236 (503) 813-6508 - fax Larry.Frick@PacifiCorp.com Kang-Ling Ching Pacific Gas and Electric Company Mail Code B15A PO Box 770000 San Francisco, CA 94177-0001 (415) 973-7637 (415) 973-8804 – fax Email: kxc5@pge.com PART VI Item 1-71
- Page 29 and 30: 6. West of Hatwai Revised December
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Study Criteria<br />
(continued)<br />
Remedial<br />
Actions<br />
Required:<br />
Formal<br />
Operating<br />
Procedure:<br />
Allocation:<br />
Interaction<br />
w/Other<br />
Transfer <strong>Path</strong>s:<br />
Contact Person:<br />
B. Islanding With the PAC-PG&E 115 kV Tie<br />
This simulation assumes the addition of 100 MW on the existing Line 14,<br />
115 kV Tie. This increase indicates that the minimum transient swing<br />
voltage at Devers would drop from 81.7% to 79.5% or a 2.2% reduction.<br />
In addition to standard protection, a thermal relay is installed at Cascade and<br />
out-of-step indication is installed at Weed Junction.<br />
In the event of islanding, Line 14 is tied into the relaying and communication<br />
of the WECC “islanding” scheme. It is to be tripped approximately six cycles<br />
after the 3-line loss of the COI.<br />
PacifiCorp is the operating agent and uses real-time flows to monitor this<br />
path.<br />
The entire path transfer capability is owned by PacifiCorp.<br />
No interaction with other WECC paths. However, transfer capability could<br />
be limited at times due to local loads.<br />
Larry Frick<br />
PacifiCorp, Transmission Planning<br />
Lloyd Center Room 1800<br />
825 NE Multnomah<br />
Portland, OR 97232<br />
(503) 813-6236<br />
(503) 813-6508 - fax<br />
Larry.Frick@PacifiCorp.com<br />
Kang-Ling Ching<br />
Pacific Gas and Electric Company<br />
Mail Code B15A<br />
PO Box 770000<br />
San Francisco, CA 94177-0001<br />
(415) 973-7637<br />
(415) 973-8804 – fax<br />
Email: kxc5@pge.com<br />
PART VI Item 1-71
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