POWER LINE CLEARANCE AND LANDSCAPES UNIT...Power Line Clearance and Landscapes Unit. Mission: PLC&L...
Transcript of POWER LINE CLEARANCE AND LANDSCAPES UNIT...Power Line Clearance and Landscapes Unit. Mission: PLC&L...
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POWER LINE CLEARANCE AND LANDSCAPES UNIT
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IntroductionDavid Bayard PLC and Landscapes Manager
- Tree Care industry since 2000- ISA CA (2009), ISA TRA Qualified (2013)- WA DNR Urban and Community Forestry
Council (2017)- Seattle UF Core Team- Recreational Tree Climbing company owner/facilitator (2011)
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SEATTLE CITY LIGHT SYSTEM OVERVIEW
Public Power Generator, Transmitter, Distributor• 10th Largest Public Utility in the U.S.
o 430K Meterso 656 Trans. (506 NERC), 2300 Dist., 317 Network Circuit-Mileso 7 Hydroelectric Generation siteso 16 Major Substations
* Data from https://www.publicpower.org/public-power/stats-and-facts
68%
15%
13% 4%
Electricity Providers in U.S. by Market Share
IUOs Public Power
REC Power Marketers
Public Power:*2,011 Utilities (60%)
https://www.publicpower.org/public-power/stats-and-facts
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Generation – Transmission - Distribution
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Seattle City Light System OverviewTransmission System Distribution Service Territory
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Organizational Context
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Organizational Context
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Seattle City Light’s Power Line Clearance and Landscapes Unit
Mission:PLC&L is committed to ensuring safe and reliable power delivery through the comprehensive and environmentally responsible management of the vegetation our lines and infrastructure impact.
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Budget #s (2018)
• City Light – $1.4 B• T&D Operations O+M - $77M • PLC&L - $10M
– Labor $2.1M– Dist PLC - $6M (contract tree-trimming)– Trans ROW Maint - $500 K– Landscapes Maint - $150 K– Urban Forestry – $250K
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Distribution Tree Trimming Program
• Maintains and monitors over 300,000 trees with grow/fall in potential
• Trims over 2300 circuit-miles of overhead lines in Seattle and parts of Burien, Lake Forest Park, Normandy Park, Renton, SeaTac, Shoreline, Tukwila and Unincorporated King County.
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Typical Distribution System Facilities
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Dist Tree Trim Methodology• Feeder-based
• 4-5 yr. cycle for entire service area
• All regular maintenance tree trimming done by contractors
• Vegetative clearance distances informed by WA WAC 296-24-960,tree care industry BMPs and budget.
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• Directional Pruning (“natural” or “drop-crotch”) – an increased focus on proper arboriculture yields “deeper” cuts 1st time around. No “rounding over” or “shaping”.
• All contractors are Journey-level Tree Trimmers or apprentices. All work identified (notified) and audited by ISA Certified Arborists (CA)
• All Contract Tree crews have min. 1 ISA CA per crew – anomaly in the industry
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Transmission Right-of-Way Maintenance Program
• Manages vegetation along 656 circuit-miles of transmission lines through King, Snohomish, Skagit, Whatcom and Pend Oreille counties.
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Transmission Right-of-Way Maintenance Program
• - Work Managed on 2 yr. cycle informed by annual inspections.
• - 230kV system Subject to Federal regulation
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Transmission Right-of-Way Maintenance Program
• Min Clearances informed by WAC, NERC and Cycle
• Follow Wire-Zone – Border-Zone BMPs
Seattle City Light Minimum Vegetation Clearance
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Line Voltage in kilovolts (1000 volts)
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Minimum Vegetation Clearance (feet)
Line Voltage in kilovolts (1000 volts)
Minumum Vegetative Clearances in Feet
Seattle City Light Minimum Vegetation Clearance
10.3333333333
10.6666666667
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11.3333333333
11.6666666667
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12.3333333333
12.6666666667
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13.3333333333
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Minimum Vegetation Clearance (feet)Voltage (kV)
10.050 or below
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11.710010.336.3333333333
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18.0290
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18.7310
19.0320
19.3330
19.7340
20.0350
20.3360
20.7370
21.0380
21.3390
21.7400
22.0410
22.3420
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28.7610
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31.7700
32.0710
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32.7730
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33.3750
33.7760
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Minimum Vegetation Clearance (feet)
Line Voltage in kilovolts (1000 volts)
Minumum Vegetative Clearances in Feet
Seattle City Light Minimum Vegetation Clearance
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Importance of Regular Cycle Maintenance
- “Deferral of line clearance beyond an optimal cycle can result in increased costs…of 23% - 70% per unit” (2009 ACRT assessment).
- 71% of (distribution) trees are “medium” or “fast” growing species
-In 2006 after several years of not funding Veg. Mgmt we had over 875 outages due to vegetation, mostly trees. Since then the average has been about 182 outages/year.
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SCL Urban Forestry:Urban Tree Replacement Program
• Partners with Trees for Seattle and SDOT on tree planting/establishment projects
• Partners with Washington State Nursery and Landscape Association (WSNLA) to provide Urban Landscape Tree Replacement Certificates in Franchise Cities
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SCL Urban Forestry• “Right Tree Right Place” information and customer care
– Average 1600+ calls/emails per year
• Maintains National Arbor Day Tree Line USA designation since 2013
• Special Projects: - Cambistat pilot, - Green Line Transmission Corridor Community Stewardship pilot,
- PLC Standards update, - 4 kV Substation Vactor-ing pilot
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Landscapes Maintenance - 16 Major Substations
- Neighborhoods- Showpiece Landscapes- Landmark Building
Designs
- Over 75 Properties- Decommissioned Subs- Service Centers and
System Operations Center- Other Facilities
- Restoration Projects
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Landscapes Maintenance
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THANK YOU!
QUESTIONS?David BayardPower Line Clearance and Landscapes ManagerSeattle City LightPh: [email protected]
Power Line Clearance and Landscapes UnitIntroductionSeattle City Light system overviewGeneration – Transmission - DistributionSeattle City Light System OverviewOrganizational ContextOrganizational ContextSeattle City Light’s �Power Line Clearance and Landscapes UnitBudget #s (2018)Distribution Tree Trimming ProgramTypical Distribution System Facilities Dist Tree Trim MethodologySlide Number 13Transmission Right-of-Way Maintenance Program Transmission Right-of-Way Maintenance Program Transmission Right-of-Way Maintenance Program Importance of Regular Cycle Maintenance�� - “Deferral of line clearance beyond an optimal cycle can result in increased costs…of 23% - 70% per unit” (2009 ACRT assessment). ��- 71% of (distribution) trees are “medium” or “fast” growing species ��-In 2006 after several years of not funding Veg. Mgmt we had over 875 outages due to vegetation, mostly trees. Since then the average has been about 182 outages/year.SCL Urban Forestry:�Urban Tree Replacement ProgramSCL Urban ForestryLandscapes Maintenance Landscapes Maintenance Slide Number 22