NOTICE DATE:  July 24, 2015
NOTICE TYPE:  W-A072415-01 Operations
SHORT DESCRIPTION:  Proposal to modify Morgan Creek Station Special Protection System
INTENDED AUDIENCE:  ERCOT Market Participants
DAY AFFECTED:  Comments due August 7, 2015
LONG DESCRIPTION:  ERCOT has received a proposal to modify a Special Protection System (SPS) at the Morgan Creek Station from Oncor Electric Delivery (Oncor). The Morgan Creek Station SPS is currently designed to protect against overloading by monitoring flows on Morgan Creek to Barber Lake 138 kV lines, Morgan Creek to Sun 138 kV Line, and Morgan Creek 138/69 kV autotransformer under various system conditions.
In the summer of 2015, Oncor replaced the existing 138/69 kV autotransformer at Morgan Creek Sw. Sta. with a new 177 MVA 138/69 kV autotransformer. The upgrade of the Morgan Creek 138/69 kV autotransformer is completed; however, a 138 kV terminal rated at 600 A will limit the flow on the Morgan Creek 138/69 kV autotransformer until the 138 kV bus is upgraded in fall of 2015.
The proposed modifications to the Morgan Creek Station SPS are being reviewed by ERCOT. Comments on the proposed SPS are due by August 7, 2015 and should be submitted to [log in to unmask]<mailto:[log in to unmask]> using the attached comment form. Any questions or concerns raised during this timeframe will be addressed by ERCOT or Oncor.
ACTION REQUIRED:  Any comments to this proposal are due to ERCOT by August 7, 2015 using the attached form.
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<https://mis.ercot.com/pps/tibco/mis/Pages/Grid+Information/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]<mailto:[log in to unmask]>.
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