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PGRR025

Summary

Title Addition of Criteria for Autotransformer Unavailability
Next Group
Next Step
Status Approved
Effective Dates
06/01/2013

Action

Date Gov Body Action Taken Next Steps
05/14/2013 BOARD Recommended for Approval
03/07/2013 TAC Recommended for Approval ERCOT Board Consideration
02/14/2013 ROS Recommended for Approval TAC Consideration
01/23/2013 PLWG Recommended for Approval ROS Consideration
12/04/2012 PLWG Recommended for Approval PLWG IA Review

Voting Record

Date Gov Body Motion Result
05/14/2013 BOARD To approve PGRR025 as recommended by TAC in the 3/7/13 TAC Report Passed
03/07/2013 TAC To recommend approval of PGRR025 as recommended by ROS in the 2/14/13 ROS Report Passed
02/14/2013 ROS To recommend approval of PGRR025 as recommended by PLWG in the 1/23/13 PLWG Report Passed
01/23/2013 PLWG To endorse and forward the 12/4/12 PLWG Report and Impact Analysis for PGRR025 to ROS
12/04/2012 PLWG Consensus to recommend approval of PGRR025 as submitted

Background

Status: Approved
Date Posted: Nov 2, 2012
Sponsor: PLWG
Urgent: No
Sections: 4.1.1.2
Description: This Planning Guide Revision Request (PGRR) adds testing and performance requirements to the ERCOT reliability criteria for the unavailability of any 345/138 kV autotransformer.
Reason: At its 9/13/12 meeting, ROS directed the Planning Working Group (PLWG) to modify the ERCOT planning criteria to add ERCOT System performance testing associated with the unavailability of an autotransformer. High voltage autotransformers are typically known to have long lead delivery times ranging anywhere between one year to two years. The outage and subsequent long-term unavailability of autotransformers can impact ERCOT System reliability and needs to be accounted for in planning studies. The proposed North American Electric Reliability Corporation (NERC) Reliability Standard TPL-001-2, Transmission System Planning Performance Requirements, R.2.1, 2.1.5 requires Entities to assess the impact of the possible unavailability of major transmission equipment having a lead time of one year or more (such as a transformer) on system performance. Proposed performance testing requirements are limited to paragraphs (1)(c) and 1(d) and line 3 of Table 1, ERCOT-specific Reliability Performance Criteria, of Section 4.1.1.2.

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