Path Rating Catalog 2013 - Western Electricity Coordinating Council

Revised January 2006
47. Southern New Mexico (NM1)
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:
Southern New Mexico
Sum of the flows on the following transmission lines:
Line
Metered End
West Mesa-Arroyo 345 kV West Mesa 345 kV
Springerville-Luna 345 kV Springerville 345 kV
Greenlee-Hidalgo 345 kV
Greenlee 345 kV
Belen-Bernardo 115 kV
Belen 115 kV
The definition of Path 47 has been changed to replace the West Mesa-Belen
115 kV line with the Belen-Bernardo 115 kV line, metered at Belen. This
does not result in a change in the path rating. In 2004, this change was put
through the expedited process to preserve the accepted rating status.
Simultaneous firm: 940 MW Non-simultaneous: 1048 MW
Either the Springerville-Luna 345 kV or Greenlee-Hidalgo 345 kV lines.
Simultaneous firm accepted rating established by New Mexico Transmission
Operating Procedure 2005 and non-simultaneous accepted rating established
by WECC Peer Review Group in 1995.
Ratings are independent of transfer levels between major WECC areas.
Ratings were established for a heavy summer system and are dependent upon
Arroyo phase shifter schedules, generation levels, area power factors and
reactor levels in southern New Mexico.
Local New Mexico pre-disturbance voltage levels between 0.95 p.u. and
1.05 p.u. Post-transient voltage deviation no greater than 7% from base case
levels on southern New Mexico 345 kV buses and 6% on northern New
Mexico 345 kV buses. WECC criteria applied for systems outside New
Mexico area.
For double contingencies on the 345 kV lines defined above, WECC
Operating Procedure EPE-1 is implemented.
New Mexico Transmission Operating Procedure, effective 1/1/05.
EPE, Tri-State G&T, PNM
Interaction with Northern New Mexico Transfer Path (NM2) is controlled
with the Arroyo phase shifter.
PART VI Item 1-131