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Overview

Alder Substation Gas Insulated Switchgear (GIS) InstallationProject drivers and objectivesPublic outreach processProject & Ongoing ChallengesTriumphs & TribulationsLessons Learned & Continuous Improvements

Future PGE GIS ProjectsCurtis Substation Reconfigure 115 kV BusBell Substation Station Upgrades

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Alder Substation Project Drivers and Objectives

Multiple SE Portland distribution voltages4kV system was archaic and physically deterioratingSE Portland 13kV system load exceeds Planning GuidelinesS ecific contin encies would result in lon duration outa es for urban customers

Installation of a new transformer and feeder capacity at Aldersubstation address:

4kV conversionMitigation of overloaded feeders

Redundancy during maintenance & unplanned outages

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Alder Substation Site Januar , 2010

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Alder Substation Preliminar Desi n

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Public Outreach Process

Highly involved neighborhood associationMultiple meetings with the neighborhood association

June 2008PGE presents initial design to neighborhood association Land Use Team

August 2008Response less than enthusiastic

Neighborhood association proposed moving Alder or moving it undergroundOctober 2008

PGE presents AIS design

January 2009

Neighborhood association support secured

Project approved in February, 2009 utilizing GIS

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GIS Pro ect Challen es

DesignWe dont do this everyday

Specify & order GIS

Short design durationProject approval - February, 2009Foundation construction - March, 2010

Other project firstsons ruc onEquipment layout & small project site

Caused inefficient installation

GIS Voltage Transformer

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GIS On oin Challen es

TrainingLong maintenance interval

Aging workforceTravelling operatorsMeter/Relay techniciansWireman Disconnector Closed

Disconnector Opened

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GIS Design What can be significantly influenced?

Indoor/Outdoor Foundation design

SizeCable trench

on u groun em e men sFeeder connections

Location

Local control cabinetsMounting

GIS mountedSeparately mounted

Design & components Breaker & Ground Embedments

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GIS Foundation & Cable Trench

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GIS Foundation Embedments

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GIS Local Control Cabinets LCC

Considered LCC a breakermechanism cabinetConsidered motor-operateddisconnects a manually operatedswitchRequested two-door design

Added local I/O unitMinimized cable between GIS andcontrol enclosure

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GIS Local Control Cabinets LCC

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Front View Rear View


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Alder Substation GIS Installation Trium hs

Met project objectivesProvided adequate spacebetween breakers

Specified 5 ft minimum

Cable trench pullouts

Minimized trip hazards

Local Control CabinetI/O units minimized field alarmwirin .Two door design (front/backaccess)

Self-performed construction

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Alder Substation GIS Installation Tribulations

Construction cost and scheduleexceeded estimatesGIS foundation issuesTransmission line disconnects remainedHi-pot testing difficultiesVoltage transformers

Non-standard disconnecting means

Gas filling / gas cart inadequacy

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Alder Substation - Before

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Lessons Learned & Continuous Im rovements

Remove GIS line disconnector Separate Local Control CabinetsSeparate GIS and controlenclosure cablingnc u e vo age rans ormers or

each GIS feeder

Utilize composite bushings

open at LCCDesign flush breaker

Project after concrete pour Procure adequate gas cart

Alder LCCs

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Curtis Fall, 2012 Ener ization

Existing Curtis SubstationCompliance Project Transmission Drop

Rebuild Curtis to a 4 position ringbus

Expandable to 5 th position2nd future transformer

Distribution is unchanged

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Curtis Substation Outdoor Electrical Desi n

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Curtis Substation Se tember, 2012

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Bell Substation Fall, 2013 Ener ization

Customer Reliability Project Existing Bell SubstationRebuild Bell Substation to a 5position ring bus

Duplicate Curtis layoutStreamlined design to support

aggressive civil construction

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Bell Substation Outdoor Electrical Desi n

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