NOTICE DATE:  February 18, 2016

NOTICE TYPE:  W-A072415-03 Operations

SHORT DESCRIPTION:  Update - Proposal to modify Morgan Creek Switching Station Special Protection System

INTENDED AUDIENCE:  ERCOT Market Participants

DAY AFFECTED:  April 18, 2016

LONG DESCRIPTION: ERCOT has completed its review of Oncor Electric Delivery’s proposal to modify the Morgan Creek Switching Station (Morgan Creek) Special Protection System (SPS). The Morgan Creek SPS is designed to monitor and relieve thermal violations on Morgan Creek to Barber Lake 138 kV lines, Morgan Creek to Sun Switch 138 kV Line, and the Morgan Creek 138/69 kV autotransformer under various system conditions.

With the upgrade of the 138 kV bus at Morgan Creek now complete, ERCOT recommends that the arming limit for protecting the 138/69 kV autotransformer Morgan Creek SPS be modified from 600 A to 740 A (i.e. 177 MVA) as proposed.

The Morgan Creek SPS is scheduled to be modified on April 18, 2016.

ADDITIONAL INFORMATION: Information regarding all SPSs can be found in the “Special Protection Systems and Remedial Action Plans” portlet located on the Long-Term Planning page of ERCOT’s Market Information System (MIS). A Digital Certificate is required to access the MIS.

CONTACT:  If you have any questions, please contact your ERCOT Account Manager. You may also call the general ERCOT Client Services phone number at (512) 248-3900 or contact ERCOT Client Services via email at [log in to unmask].

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sa/mm