20180208PAC to Staff Lake Side 2 RAS - Assessment.docx

PacifiCorp Main Grid Planning
PRC-(012 through 014)-WECC-CRT2
Attachment B RAS Assessment
RAS Name
Lakeside 2 LAPS
Reporting Party
PacifiCorp
Group Conducting Assessment
PacifiCorp Main Grid Planning
Jason Wilson
Assessment Date
12/31/14
Review the scheme purpose and impact to ensure proper classification, is it (still) necessary, does it serve the intended purposes, and does it continue to meet current performance requirements.
The Lakeside 2 LAPS is designed to prevent overloads on the Spanish Fork to Timp 138 kV line following the N-1-1 or N-2 loss of the Camp Williams to Steel Mill and the Camp Williams to Spanish Fork 345 kV lines by initiating generator runback and/or tripping of generation at Lakeside 2 plant.
The Lakeside 2 LAPS is listed as a Local Area Protection Scheme. This designation is appropriate due to the level of generation tripping (<1000 MW) andload loss exposure (<300 MW). Impacts are limited to thermal overloads on the local 138 kV transmission system for failure of the scheme to operate. There are no system impacts for inadvertent operation of the scheme.
Study results indicate that the Lakeside 2 LAPS is still necessary to mitigate thermal overloads on the Spanish Fork 138 kV transmission system following the N-2 loss of the Camp Williams to Spanish Fork and the Camp Williams to Steel Mill 345 kV lines.
The scheme is effective up to approximately 3400 MW of south to north transfers across the PacifiCorp internal Wasatch Front South Boundary with study conditions listed below.Above these flow levels, preemptive operator actions to sectionalize the 138 kV system north of Spanish Fork are required to prevent post-contingency thermal overloads.
This RAS assessment included the following:
Study Years
2014
System Conditions
Heavy south to north Transfers into Utah from TOT2C, TOT2B1, and TOT2B2 in conjunction with heavy Wasatch Front load, heavy generation in the Huntington/Emery area, and Lakeside 1 generation units offline. This combination of system conditions results in maximum stress on the 138 kV system north of Spanish Fork for the N-2 outage of the Camp Williams to Steel Mill and Camp Williams to Spanish Fork 345 kV lines.
Contingencies analyzed
(select what applies)
N-1
N-1-1
N-2
Extreme
N-1-1, N-2
Date when the technical studies were completed
2014
Does the RAS comply with NERC standards and WECC Criteria?
Yes
Discuss any coordination problems found between this RAS and other protection and control systems during this (most recent) assessment.
None
Provide a Corrective Action Plan if this RAS was found to be non-compliant or had coordination problems during this (most recent) assessment (should be NA for owner’s initial assessment).
N/A
Additional Notes
N/A