Attachment 2: Contingencies Studies The following list of contingencies were included for thermal, voltage, post-transient and transient stability. For transient stability analysis and while Table 1 within the NERC Planning Standards TPL-001 thru 004 allow for simulating a single-line to ground(SLG) fault for certain contingencies, this WASN transmission assessment was conducted simulating 3-phase faults for all of the contingencies studied, but included SLG faults for some contingencies to verify that this type of fault would produce less of an impact to system reliability. The fault was applied on the leading bus. For example, a 3-phase fault was applied at Captain Jack for a fault on the Captain Jack to Olinda 500 kV line that’s results in an outage of the line after the fault is cleared in 4 cycles. resulting in the loss of a single element NERC Level B – Captain Jack Olinda 500 kV – Olinda 500 kV – Folsom Power Plant Units 1, 2 or 3 Nimbus Power Plant Units 1 or 2 Roseville Generation Units Rep1, 2 or 3 Roseville Generation CT’s 1 or 2 Sutter Power Plant Units 1, 2, or 3 Airport Cottonwood 230 kV – Cottonwood Round Mountain 230 kV – Cottonwood Roseville 230 kV – Cottonwood Shasta 230 kV overlapping with Shasta Units 1 & 2 – Cottonwood Shasta 230 kV overlapping with Shasta 3 & 4 – Elverta WAPA 230 kV – Fiddyment Elverta WAPA 230 kV – Fiddyment Roseville 230 kV – Flanagan Keswick 230 kV – Folsom Lake 230 kV – Folsom Nimbus 115 kV – Folsom Orangevale 230 kV – Folsom Roseville 230 kV – Goldhill Lake 230 kV – Keswick Airport 230 kV – Keswick JF Carr 230 kV – Keswick O’Banion 230 kV – Keswick Spring Creek 230 kV overlapping with Spring Creek Unit 1 – O’Banion Elverta WAPA 230 kV – O’Banion Natomas 230 kV – Olinda Cottonwood 230 kV – Olinda Keswick 230 kV – Olinda O’Banion 230 kV – Rancho Seco Bellota 230 kV – Roseville Elverta WAPA 230 kV – Roseville Folsom 230 kV – Shasta Flanagan 230 kV – Sutter O’Banion 230 kV and Sutter Power Plant –
Attachment 2: Contingencies Studies The following list of contingencies were included for thermal, voltage, post-transient and transient stability. For transient stability analysis and while Table 1 within the NERC Planning Standards TPL-001 thru 004 allow for simulating a single-line to ground(SLG) fault for certain contingencies, this WASN transmission assessment was conducted simulating 3-phase faults for all of the contingencies studied, but included SLG faults for some contingencies to verify that this type of fault would produce less of an impact to system reliability. The fault was applied on the leading bus. For example, a 3-phase fault was applied at Captain Jack for a fault on the Captain Jack to Olinda 500 kV line that’s results in an outage of the line after the fault is cleared in 4 cycles. resulting in the loss of a single element – NERC Level B Captain Jack – Olinda 500 kV Olinda – 500 kV Folsom Power Plant Units 1, 2 or 3 Nimbus Power Plant Units 1 or 2 Roseville Generation Units Rep1, 2 or 3 Roseville Generation CT’s 1 or 2 Sutter Power Plant Units 1, 2, or 3 Airport – Cottonwood 230 kV Cottonwood – Round Mountain 230 kV Cottonwood – Roseville 230 kV Cottonwood – Shasta 230 kV overlapping with Shasta Units 1 & 2 Cottonwood – Shasta 230 kV overlapping with Shasta 3 & 4 Elverta WAPA – 230 kV Fiddyment – Elverta WAPA 230 kV Fiddyment – Roseville 230 kV Flanagan – Keswick 230 kV Folsom – Lake 230 kV Folsom – Nimbus 115 kV Folsom – Orangevale 230 kV Folsom – Roseville 230 kV Goldhill – Lake 230 kV Keswick – Airport 230 kV Keswick – JF Carr 230 kV Keswick – O’Banion 230 kV Keswick – Spring Creek 230 kV overlapping with Spring Creek Unit 1 O’Banion – Elverta WAPA 230 kV O’Banion – Natomas 230 kV Olinda – Cottonwood 230 kV Olinda – Keswick 230 kV Olinda – O’Banion 230 kV Rancho Seco – Bellota 230 kV Roseville – Elverta WAPA 230 kV Roseville – Folsom 230 kV Shasta – Flanagan 230 kV Sutter – O’Banion 230 kV and Sutter Power Plant
2009_WAPA_SNR_Study_Report_Final.docx