FAC-003-1: Transmission Vegetation Management Program FAC-003-2: Transmission Vegetation Management

Transcription

1 FAC-003-1: Transmission Vegetation Management Program FAC-003-2: Transmission Vegetation Management 2/21/2012 1

2 FAC-003-1/2 Status FAC-003-1: Approved by FERC in Order 693. Currently in effect and mandatory and enforceable. FAC-003-2: Approved by the NERC Board of Trustees on November 3, Submitted to FERC for approval on December 21, Pending FERC approval. 2/21/2012 2

3 Purpose What is the purpose of FAC-003-1/2? Essentially to: Improve reliability of the transmission system by preventing and minimizing transmission outages caused by vegetation. 2/21/2012 3

4 FAC Lessons Learned Lessons Learned All Category 1 (grow-ins from inside/outside the ROW) and Category 2 outages (fall-ins from inside the ROW) are reportable and are violations of FAC R2. Momentary outages resulting from flashover are not reportable, but are violations of FAC R2. Encroachments closer than Clearance 2 distances are violations of FAC R2. The auditor needs to verify whether altitude correction factors need to be applied to develop Clearance 2. FAC can be very documentation heavy. 2/21/2012 4

5 FAC FAC /21/2012 5

6 FAC New Terms New terms or revised definitions in NERC Glossary of Terms pending FERC approval: Right-of-Way (definition is based on engineering and construction considerations that establish the width of a corridor from a technical basis) Vegetation Inspection (allows both maintenance inspections and vegetation inspections to be performed concurrently) Minimum Vegetation Clearance Distance (MVCD) based on Gallet equations 2/21/2012 6

7 FAC Outage Types 7 Types of Sustained Outages: Category 1A Grow-ins: Sustained Outages caused by vegetation growing into applicable lines, that are identified as an element of an IROL or Major WECC Transfer Path, by vegetation inside and/or outside of the ROW (R1); Category 1B Grow-ins: Sustained Outages caused by vegetation growing into applicable lines, but are not identified as an element of an IROL or Major WECC Transfer Path, by vegetation inside and/or outside of the ROW (R2); Category 2A Fall-ins: Sustained Outages caused by vegetation falling into applicable lines that are identified as an element of an IROL or Major WECC Transfer Path, from within the ROW (R1); Category 2B Fall-ins: Sustained Outages caused by vegetation falling into applicable lines, but are not identified as an element of an IROL or Major WECC Transfer Path, from within the ROW (R2); 2/21/2012 7

8 FAC Outage Types 7 Types of Sustained Outages (Cont d): Category 3 Fall-ins: Sustained Outages caused by vegetation falling into applicable lines from outside the ROW; Category 4A Blowing together: Sustained Outages caused by vegetation and applicable lines that are identified as an element of an IROL or Major WECC Transfer Path, blowing together from within the ROW (R1). Category 4B Blowing together: Sustained Outages caused by vegetation and applicable lines, but are not identified as an element of an IROL or Major WECC Transfer Path, blowing together from within the ROW (R2). Which Category is outside the control of the TO? Category 3 2/21/2012 8

9 FAC Notes Category 1A, 1B, 2A, 2B, 4A and 4B outages are direct violations of R1 or R2. The VRF is higher for encroachments into the MVCD of a line identified as an element of an IROL or Major WECC transfer path than for encroachments into the MVCD for lines not identified as elements of an IROL or Major WECC transfer path. The VSL is higher for Sustained Outages than for encroachments without a Sustained Outage Category 3 outages are not violations of R1 or R2. 2/21/2012 9

10 FAC and FAC Similarities Although the words are different, the purpose of both versions of FAC-003 is essentially the same. Both versions of FAC-003 are applicable to the Transmission Owner function. Both versions of FAC-003 apply to transmission lines operated at 200 kv or higher. Both versions of FAC-003 have a mechanism for applicability to transmission lines operated below 200 kv. 2/21/

11 FAC and FAC Similarities Cont d Both versions establish clearances to be maintained at all time to prevent flashover (Clearance 2 and MVCD) Both versions have exemptions for vegetation related transmission outages outside of the TO s control (tornadoes, hurricanes, floods, animal activity, etc.) Both versions categorize different types of sustained outages caused by vegetation 2/21/

12 FAC and FAC Differences Version 1 is applicable to the RRO, version 2 is not applicable to the RRO For version 1, the applicability of transmission lines operated at less than 200 kv is determined by the RRO, for version 2 it is determined by identification as an element of an IROL under FAC-014 by the Planning Coordinator, or identification as an element of a Major WECC Transfer Path in the BES by WECC (within WECC). 2/21/

13 FAC and FAC Differences Cont d Version 1 is more documentation based, version 2 is more results based Under version 1, the minimum clearance to be maintained (Clearance 2) is specified by an IEEE standard, under version 2, the minimum clearance to be maintained (MVCD) is specified within the Standard (and based on Gallet s equations). Categories of vegetation outages are different: Category 1, 2, or 3 for version 1 Category 1A, 1B, 2A, 2B, 3, 4A or 4B for version 2 2/21/

14 FAC and FAC Differences Cont d Under version 1, inspection frequency is at the discretion of the TO. Under version 2, the minimum inspection frequency is specified by the Standard. Outage reporting is via a Requirement in version 1, and via Additional Compliance Information I version 2. 2/21/

15 Discussion or Questions? 2/21/