hpt_aeso ug tech info session presentation(1)

8/13/2019 HPT_AESO UG Tech Info Session Presentation(1)

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UNDERGROUND

TRANSMISSION LINES

Technical Information Session

September 18, 2009


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AGENDA8:30 10:30 Technical Information Session

Opening Remarks & Housekeeping Items

Presenter Introductions

General Update

Underground Presentation

10:30 10:45 Break

10:45 12:30 Technical Information Session Resumes

Continue Underground Presentation

Final Questions

Final Remarks

12:30 2:00 Networking Lunch Reception


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HOUSEKEEPING ITEMS

Location of Emergency Exits

Information Session Format Information Session Ground Rules


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PRESENTERS

Stephen Kane AltaLink

Fred Ritter AESO Ernesto Zaccone EuropaCable

Brian Gregory CCI

Ray Awad SNC

George Bowden - AltaLink

Dave Arnold EPCOR


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General Update

Stephen Kane - AltaLink

Fred Ritter - AESO


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GENERAL UPDATE

Underground cable projects worldwide

Visit to Japan


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UNDERGROUND WORLDWIDE (AC)NORTH AMERICA: 345kV

EUROPE: 400kVCHINA: 500kV

UNDER CONSTRUCTION

JAPAN: 500kV

(40km x two circuits)Shin Toyosu Line


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Outline of system:

Name of Line: Shin-Keiyo Toyosu Line

Voltage: 500 kV

Cable: XLPE 1 x 2,500mm2

Number of Circuits: 2Length: 39.8 km

Transmission Capacity: 900 MW /circuit (1,200 MW future)

JAPAN


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JAPAN


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WORK TO DATE

Department of Energy and the AESO each

initiated a study on underground transmission

AESO working collaboratively with HeartlandProject Team

Feasibility study of 500 kV AC undergroundtransmission is continuing


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Underground Presentation

Outline

Stephen Kane

AltaLink


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George Bowden

George Bowden

Ray Awad

David Arnold

Brian Gregory

Fred Ritter

UNDERGROUND PRESENTATION OUTLINE

Stephen Kane


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Project Need, Capacity &

Reliability Requirements

Fred Ritter

AESO


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PROJECT NEED PLANNING CRITERIA

Forecast Transmission Capability Requirements

within the Northeast Alberta Region

Comply with Reliability Criteria

Alignment with the Provincial Energy Strategy


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PROJECT NEED

REQUIRED TRANSMISSION CAPABILITYRequired Transmission Capability to the Northeast Region

0

500

1,000

1,500

2,000

2,500

3,000

3,500

4,000

4,500

5,000

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019

RequiredTransmissionC

apability(MW)

Year

Load &

Generation

Scenarios


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TRANSMISSION REQUIREMENTS-

HEARTLAND REGION

WEST

Option

EAST

Option

To Fort McMurray


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CAPACITY REQUIREMENTS

3,000 MW capacity per circuit

Overhead

2008/09 peak load for the city of

Edmonton alone = 1,200 MW

Underground


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CIRCUIT 1

3000 MW

CIRCUIT 2

3000 MW

2 CABLES

1 BUNDLE OF 3

CONDUCTORS

500 kV TRANSMISSION SYSTEM ILLUSTRATION


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500 kV TRANSMISSION SYSTEM CONCEPT

CIRCUIT 1

3000 MW

CIRCUIT 2

3000 MW


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RELIABILITY REQUIREMENTS

System transfer capability 3,000 MW

If one circuit goes down, the other

must be capable of bearing the load.

Each circuit will operate up to 1,500 MW

However, each circuit must be capable of carrying

3,000 MW in the event of an outage.

1,500 MW

1,500 MW

3,000 MW


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SUMMARY

Work is continuing to advance the transmission reinforcement

into the Northeast region.

Feasibility studies will be continued on 500 kV underground

transmission.

Heartland transmission development is:

Consistent with AESOs Long-term Transmission Plan;

and

Aligned with the Provincial Energy Strategy.

AESO has directed the HPT to submit a Facility Application to

meet the need considering options as noted earlier.


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SUMMARY


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QUESTIONS?


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Losses

Fred Ritter

AESO


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LOSSES

Alberta Transmission System losses from 2006 to 2008

Year Transmission Loss (MWh) Transmission Loss (%)

2006 2,842,000 4.9%2007 2,816,000 4.8%

2008 2,672,000 4.6%


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LOSSES


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LOSSES

System and detailed engineering studies are being

performed to assess the losses for combinedoverhead/underground system with and without reactors.

Study considerations include:

Reactors

Cable design

Power flow

Loading on the circuit Overhead design

Cable circuit length


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QUESTIONS?


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Cable Design

Brian Gregory

CCI


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DESIGN 500 kV CABLE: TOPICS

500 kV Cable

Types of 500 kV Cable

Cable Requirements

500 kV Cable System

Cable Accessories

Reliability

Cable Repair Requirements

Thermal Design Considerations

Cable Length


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500 kV CABLE

Insulation shield

Insulation

Cushioning layers

Metal sheath and

ground conductor

Jacket

Conductor shield

Conductor

155 mm6.25 in


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TYPES OF 500 kV CABLE

500 kV 1,000mm2 Grand Coulee Dam

1976

500 kV 2,500 mm2 Japan 1991

500 kV 2,500 mm2 Tokyo 2000

SCFF (Self Contained Fluid Filled)Paper tapes and fluid

SCFF LPP (Laminated polypropylene paper)

tapes and oi l

Extruded XLPE

(Cross linked polyethylene)

2009


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ALTERNATIVE SYSTEMS

Gas Insulated Lines (GIL)

220kV GIL Tunnel Geneva 2001

400kV GIS Substation Elstree UK 400kV

Enclosure (plus jacketif buried)Diameter: ~600 mm, 2 ft

Connector face

Supportinsulator

Conductor

Particle trap

Spiral weld

Insulation:


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500 kV CABLE SYSTEM

Includes: Cable sections, splices, terminations and

ancillaries (e.g. link boxes)

Splices (joints)

Potheads

(terminations)

Link box

Link box


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ACCESSORIES

Terminators interface the cable ends to air

insulated equipment

Four types of 400kV potheads on pre-qual test

A 400kV splice ready for burial

Splices connect cable lengths


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HIGH RELIABILITY IS ESSENTIAL

Experience

Proving test for

service application

Cable and accessories

manufacture

400kV, one year pre-qualification

tests for Berlin

Insulation sampling


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CABLE REPAIR REQUIREMENTS

Considerations for repair of underground system:

Accessibility

400kV cable circuit below UK field

(Transmission station in distance)

In the event of damage/failure: Locate

Excavate

Repair


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CABLE REPAIR REQUIREMENTS

Temporary enclosure for below-ground

splicing in Singapore

Availability of spareequipment

Availability of specialized

team

Seasonal consideration Locating and excavating

2 to 3 weeks for a qualified

team to perform repairs.

Considerations for repair of underground system:


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500 kV CABLE THERMAL DESIGN

Considerations:

Temperature

Conductor size

Heat dissipation

Number of trenches

Spacing

Backfill Depth


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Goal: to prevent the cable from exceeding its 90oC design temperature

at the maximum summer ambient soil temperature of 20oC

A conductor size of 2,500mm2 is selected to limit the heat generation

An efficient heat flow path is provided from the cable to the ground surface:

The spacing between each cable is increased

Thermally stabilized backfil l is selected

The depth of burial is minimized

Temperature/condition monitoring



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The trenches are spaced sufficiently far apart to make

them thermally independent



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A transmission cable that carries electric current is like a long

balloon hose that carries water.

When the tap is suddenly turned on, the balloon first inflates

and must stabilize before water flows out of the end.

Low voltage cables are like stiff balloons

They dont expand much, so morewater flows out

500kV cables are like elastic balloons

They expand more, so less

water flows out

The longer a 500kV cable circuit becomes, the less electric ity it can deliver.

CABLE CIRCUIT LENGTH - LIMITS


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CABLE DESIGN SUMMARY

To be considered as a cable system

There are several types of cable systems

Cable repairs (locate, excavate, repair)

Thermal considerations impact the design details

Cable circuit (length) limitation

Reliability is essential


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SUMMARY


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QUESTIONS?


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Transition Stations

George Bowden - AltaLink


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DESIGN TRANSITION STATIONS

Transition station

Reactors

Switching

Transition station profile & layout


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TRANSITION STATION

A transition station is a location

that provides a connection point

where underground cables aretransitioned into overhead wires.

Components may include:

Arrestors

Insulators

Reactors

Termination structure


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Reactors store energy in the form of a magnetic field that is generated

from a current

Electric reactors are like water tanks that are installed at regular

intervals along the hose

When the balloon is inflating, the tank feeds out the lost water

When the balloon has stabilized, the tank level receives a top up

REACTORS


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REACTOR

Reactors could be located:

At the cable terminationstations; and

At remote station ends


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REACTORS

Reactors are needed to:

Retain capacity of

long length

underground cable

Regulate voltage


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SWITCHING

Switching is needed to:

Connect and disconnect

equipment

Maintenance isolates

equipment

Fault isolation


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TRANSITION STATION

TRANSITION STATION


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TRANSITION STATION PROFILE CONCEPT

32 m

TRANSITION STATION


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TRANSITION STATION LAYOUT CONCEPT


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TRANSITION STATIONS SUMMARY

Transition stations provide a connection from overhead

to underground

Includes components such as reactors which:

Retain capacity of the line

Regulate voltage of the line

Sample size of transition stations:

Height approximately a 10 storey building Area approximately 2 football fields

SUMMARY


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SUMMARY


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QUESTIONS?


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Geographical Considerations

Stephen KaneAltaLink

GEOGRAPHICAL CONSIDERATIONS


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Water body/

Wetland

Water body/

Wetland

River

Crossing

River

CrossingAgricultural

Land

Agricultural

Land

Road

Crossing

Road

Crossing

Rail

Crossing

Rail

Crossing

Pipeline

Crossing

Pipeline

Crossing



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Agricultural Land



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Pipelines / existing infrastructure



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Roadway Highway Cable Installation

GEOGRAPHIC CONSIDERATIONS


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GEOGRAPHIC CONSIDERATIONS

Railway



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Water Body, Pond, River and Wetland

ENVIRONMENTAL CONSIDERATIONS


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ENVIRONMENTAL CONSIDERATIONS

Water crossings/ wetlands

Wildlife habitat Agricultural lands

Archaeological sites

Historic sites Noise

GEOGRAPHICAL SUMMARY


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GEOGRAPHICAL SUMMARY

Geographical Considerations

Agricultural

Road

Pipeline

River Water body/Wetland

Environmental

SUMMARY


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SUMMARY


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Installation Techniques

Ray AwadSNC

CABLE INSTALLATION TECHNIQUES


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Trenching

Directional Drilling Pipe Jacking

Tunneling



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Trenching:

Most common technique

Cables pulled on rollers

UK: 400 kV



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Trenching (direct burial):



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Trenching (concrete duct bank):



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Horizontal

Directional Drilling:

Under wetlands, water

bodies, river crossings

and roads

Cable is pulled through

ducts



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Pipe Jacking:

Utilized under deep

obstructions

Cable is pulled in ducts



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Tunneling (prefabricated sections):



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Tunneling (prefabricated sections):

CONSTRUCTION CONSIDERATIONS


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What are the construction considerations for:

Transition Stations

Cable Installation

Cable Pulling Joint Bays



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Transition Station Considerations:

Accommodate all Cable Terminations, Switching and

Protection equipment

Small building for SF-6 terminations (optional)

Good grounding system Well drained

Fenced



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Cable Installation Considerations:

Ease of trenching: Duct Bank or in Duct

Passing under some types of pipes: HDD (Horizontal

Directional Drilling)

Major considerations: High pressure oil and gaspipelines, Highways

Push pipes or Tunneling



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Cable Pulling Considerations:

Access to site

Ambient temperature

Positioning of cable reel

and pulling winch

Completely prepared

cable infrastructure

(trench, ducts, HDD, Pipe

jacking, Joint Bays and

Cable terminationstructures)



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Joint Bay:

Approximate dimensions 12 m x 3 m x 2 m



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Joint Bay:

Temporary covering required (protection against inclement weather)

Thermal sand back-filling


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Downtown Edmonton Supply andSubstation Project (DESS)

David ArnoldEPCOR

CABLE RATINGS


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Voltage 255 kV

Ampacity as per table

The following minimum ampacities are required for all

sections of the underground transmission line.

Operating Conditions Season Rating, Amps (MVA**)Normal Operations (85% Load Factor) Summer 1,099 (472)

Normal Operations (85% Load Factor) Winter 1,294 (556)

100-hour Short Term Emergency* Summer 1,287 (535)

100-hour Short Term Emergency* Winter 1,455 (605)

*85% Preload prior to start of 100-hour short term emergency operation

Temperature - 105C maximum at Emergency rating

Fault rating 20 KA for 0.52 seconds

DOWNTOWN EDMONTON SUPPLY &

SUBSTATION PROJECT


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Cable Route


SUBSTATION PROJECT


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Duct bank Cross Section


SUBSTATION PROJECT


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Railway Crossing


SUBSTATION PROJECT


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Directional Dril ling Rig


SUBSTATION PROJECT


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Barrel

Reamer


SUBSTATION PROJECT


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Pipe


SUBSTATION PROJECT


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Pipe

Install


SUBSTATION PROJECT


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Duct

Installation


SUBSTATION PROJECT


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Trench


SUBSTATION PROJECT


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Excavation


SUBSTATION PROJECT


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Excavation


SUBSTATION PROJECT


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Duct bank

installation

in a manhole


SUBSTATION PROJECT


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Excavation


SUBSTATION PROJECT


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Jack & Bore Tunnel


SUBSTATION PROJECT


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Manhole


SUBSTATION PROJECT


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Cable


SUBSTATION PROJECT


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Cable Reel


SUBSTATION PROJECT


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Termination


SUBSTATION PROJECT


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Cable

Splice

CONSTRUCTION SUMMARY


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SUMMARY


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QUESTIONS?


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Operation & Maintenance

George BowdenAltaLink

OPERATION & MAINTENANCE

An underground cable maintenance program would


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An underground cable maintenance program would

typically include a combination of the following:

Time Based Maintenance (Scheduled)

Conditional Maintenance (Unscheduled)

Corrective Maintenance (Unscheduled)

Th bl t ld l b l l i t d f



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The cable route would also be regularly inspected for:

Changing soil conditions New construction in the area

Examine connections

Where manholes are used, check the duct entrances

Look for signs of movement at cable terminations.

Check cable mountings and supports



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Spare Equipment Requirements:

Cable

Joints and terminations

Accessories and other mechanical items unique to thecable installation

Spare parts for reactors similar to transformer spare

parts

OPERATION & MAINTENANCE -SUMMARY

Maintenance program:


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Maintenance program:

Time Based Maintenance (Scheduled)

Conditional Maintenance (Unscheduled)

Corrective Maintenance (Unscheduled)

Inspections

Spares

SUMMARY


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QUESTIONS?


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Closing Remarks

Fred Ritter - AESOStephen Kane - AltaLink


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Thank You

hpt_aeso ug tech info session presentation(1)

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