This Path Rating (Tot Description) is provided for information only and is not to be considered as an official copy.  The official Path Ratings are maintained by the Western Systems Coordinating Council (WSCC) and can be requested from their web site at www.wscc.com.
 
 

Location:	West-Central Colorado
Definition:	Sum of the flows on the following transmission lines:
	Line:	Metered End:
	Hayden-Archer 230kV	Archer
	Craig-Ault 345kV	Craig
	Gore Pass-Blue River 230kV	Blue River
	Hayden-Gore Pass 138kV	Gore Pass
	Gore Pass 230/138kV Transformer	Gore Pass 230
	Gunnison-Poncha 115kV	Poncha
	Poncha-Midway 230kV	Midway/San Luis
	Poncha-San Luis 230 kV	San Luis
	Basalt-Malta 230kV	Basalt
	Basalt-Hopkins 115kV	Basalt
	Rifle-Hopkins 230kV	Rifle
Transfer Limit:	West to East	1675 MW
	East to West	Not defined
Critical Disturbance that limits the transfer capability:	The critical disturbance is the outage of the Hayden-Gore Pass 230 kV line and the remedial action of opening the parallel Hayden-Gore Pass 138 kV line. The limiting elements are the overload of the Craig-Ault 345 kV and Rifle-Malta 230 kV lines.
When:	Rating established in "Hayden-Blue River 230kV Transmission Line Operating Study, Phase 1 Report - System Normal Operation" dated October 1987; and "Phase 2 Report - Line Outage Conditions" dated May 1988. The operating study was conducted jointly by:  Colorado-Ute Electric Association (CUEA) [now PSCO and TSGT]  Platte River Power Authority (PRPA)  Public Service Company of Colorado (PSC)  Tri-State Generation and Transmission Cooperative (TSGT)  Western Area Power Administration (WAPA) - Salt Lake, Golden, Montrose, Loveland  Salt River Project (SRP)
System Conditions:	This rating is independent of peak load/light load assumptions or transfer levels between major areas of WSCC. This path is affected primarily by power exchanges within Colorado, and historically the flows hav all been west to east across the path.
Study Criteria:	(Summary)  System intact: Per unit voltages between 0.95 p.u. and 1.05 p.u.  All line and transformers loaded to less than continuous rating.  Single contingency outage conditions: Per unit voltages between 0.90 p.u. and 1.10 p.u.  All lines loaded to less than 15 minute emergency ratings.  All transformers loaded to less than 30 minute emergency ratings.  Transient voltage swings down to 0.7 p.u. permitted
Remedial Actions Required:	Remedial actions are required to achieve the rated transfer capability. Following an outage, all overloaded lines and transformers must have their loadings reduced to continuous ratings within 15 minutes. This is accomplished by reducing schedules, lowering local generation or manually tripping a lower voltage parallel path for an outage of the Hayden-Gore Pass 230kV line.
Formal Operating Procedure:	There is a formal operating procedure, the most current one dated April 10, 1997. WAPA-Rocky Mountain Region is the operating agent and uses real-time flows to monitor the path.
Allocation:	The transfer capability of the path is divided between WAPA, PRPA, TSGT, and PSC.
Interaction w/Other Transfer Paths that would Reduce the Capability of this path:	None.
Contact Person:	John Wetzel Western Area Power Administration Rocky Mountain Region 5555 East Crossroads Boulevard Loveland, CO 80538-8986 (970) 490-7254 (970) 490-7213 - fax wetzel@wapa.gov

Transmission Area Map
RMA OASIS Home Page