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Path Rating Catalog 2013 - Western Electricity Coordinating Council

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80. Montana Southeast<br />

Revised January <strong>2013</strong><br />

Accepted <strong>Rating</strong><br />

Existing <strong>Rating</strong><br />

Other<br />

Location:<br />

Southeast Montana<br />

Definition: 1. Billings-Yellowtail 230 kV<br />

2. Rimrock-Yellowtail 161 kV<br />

3. Hardin-Crossover 230 kV<br />

4. Huntley-Crossover 230 kV<br />

Transfer Limit:<br />

Critical<br />

Disturbance<br />

that limits the<br />

transfer<br />

capability:<br />

When:<br />

System<br />

Conditions:<br />

Study Criteria:<br />

Remedial<br />

Actions<br />

Required:<br />

Formal<br />

Operating<br />

Procedure:<br />

Allocation:<br />

Interaction<br />

w/Other<br />

Transfer <strong>Path</strong>s:<br />

Contact Person:<br />

Note: The metered end is underscored.<br />

The path has a rating of 600 MW for both imports and exports from the<br />

Montana Control area. The System Operating Limit (SOL) for imports may<br />

be much lower depending on Yellowtail generation, Miles City DC tie flow,<br />

and loads in Northern Wyoming. The SOL nomogram is published through<br />

NOPSG.<br />

The critical disturbance for imports is a three-phase fault at the Broadview<br />

500 kV bus followed by the loss of both Broadview-Garrison 500 kV lines.<br />

This path rating is based primarily on SOL study work that has been<br />

performed since 1999 through the NOPSG committee.<br />

This path has been studied for all seasons and load conditions. The most<br />

important parameters that govern the SOL are Yellowtail generation, Miles<br />

City DC tie flow, and loads in Northern Wyoming. There is an operational<br />

nomogram for imports.<br />

WECC performance criteria are met when the path is operated below the SOL<br />

nomogram. The principal criterion that governs the SOL for import is the<br />

transient voltage dip criterion.<br />

The ATR is in service at all times. This RAS protects for the critical<br />

contingency.<br />

NWE (NWMT) operators monitor the MTSE path to assure that it is operated<br />

below the SOL nomogram on a real-time basis.<br />

The flow on this path may be constrained by reaching limits on other paths<br />

first. Examples of such paths are South of Yellowtail and West of<br />

Broadview.<br />

Eric Bahr<br />

Northwestern Energy<br />

40 East Broadway<br />

Butte, MT 59701<br />

(406) 497-3394<br />

(406) 497-3002 - fax<br />

Eric.Bahr@northwestern.com<br />

PART VI Item 1-201

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