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:	North-Central Colorado
Definition:	Sum of the flows on the following transmission lines:
	Line:	Metered End:
	Ault-Fort St. Vrain 230kV	Ault
	Weld-Fort St. Vrain 230kV	Weld
	Longs Peak-Fort St. Vrain 230kV	Fort St. Vrain
Transfer Limit:	North to South	890MW
	South to North	Not defined
Critical Disturbance that limits the transfer capability:	The critical disturbance is the outage of the Ault-Windsor-Fort St. Vrain 230kV line. The limiting element is the emergency overload on the Weld-Fort St. Vrain 230kV line.
When:	Rating established in December 1995 with publication of "Foothills Planning Group TOT 7 Operating Study Report." The operating study was conducted jointly by: Public Service Company of Colorado (PSC)  Western Area Power Administration (WAPA) - Loveland Tri-State Generation and Transmission Cooperative (TSGT)  Platte River Power Authority (PRPA)
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 Colorado/Wyoming power exchanges, and historically the flows have all been north to south across the path.
Study Criteria:	(Summary) System intact: Per unit voltages between 0.95 p.u. and 1.05 p.u.  All lines and transformer loaded to less than continuous rating.  Single contingency outage conditions: Per unit voltages between 0.92 p.u. and 1.05 p.u.  All lines loaded to less than 15 minute emergency ratings.  All transformers loaded to less than their emergency ratings.
Remedial Actions Required:	Remedial actions schemes 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 or lowering load generation.
Formal Operating Procedure:	There is a formal operating procedure; the most current one dated December 7, 1995. Public Service Company of Colorado is the operating agent and uses real time flows to monitor the path.
Allocation:	The transfer capability of the path is divided between Public Service Company of Colorado, and Platte River Power Authority.
Interaction w/Other Transfer Paths that would reduce the Capability of this path:	None.
Contact Person:	R. Mark Clements Public Service Company of Colorado 1123 W. 3 rd Avenue Denver, CO 80223-1351 (303) 571-3121 (303) 571-3524 - fax mclements@psco.com

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