PGRR #25 · Revision Request
PGRR025 Addition of Criteria for Autotransformer Unavailability
ReasonAt 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.
Created2012-12-04
Sections Affected
4.1.1.2
Summary
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.
Action Log 5 milestones
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Dec 4
PLWGRecommended for Approval→ PLWG IA Review
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Jan 23
PLWGRecommended for Approval→ ROS Consideration
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Feb 14
ROSRecommended for Approval→ TAC Consideration
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Mar 7
TACRecommended for Approval→ ERCOT Board Consideration
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May 14
BOARDRecommended for Approval
Documents 7
| Name | Type | Posted | Classification |
|---|---|---|---|
| 025PGRR-01 Addition of Criteria for Autotransformer Unavailabili | doc | Nov 2 '12 | Revision Request |
| 025PGRR-02 PLWG Report 120412 | doc | Dec 7 '12 | Committee Report |
| 025PGRR-03 Impact Analysis 011613 | doc | Jan 16 '13 | Staff Report |
| 025PGRR-04 PLWG Report 012313 | doc | Jan 24 '13 | Committee Report |
| 025PGRR-05 ROS Report 021413 | doc | Feb 19 '13 | Committee Report |
| 025PGRR-06 TAC Report 030713 | doc | Mar 8 '13 | Committee Report |
| 025PGRR-07 Board Report 051413 | doc | May 15 '13 | Committee Report |
Meetings That Took It Up 6
| Date | Meeting | Committee | Status |
|---|---|---|---|
| May 14 '13 | Board of Directors Meeting | BOARD | Concluded |
| Mar 27 '13 | Planning Working Group (PLWG) Meeting | PLWG | Concluded |
| Mar 7 '13 | Technical Advisory Committee (TAC) Meeting | TAC | Concluded |
| Feb 14 '13 | Reliability and Operations Subcommittee (ROS) Meeting | ROS | Concluded |
| Jan 23 '13 | Planning Working Group (PLWG) Meeting | PLWG | Concluded |
| Dec 4 '12 | Planning Working Group (PLWG) Meeting | PLWG | Concluded |