hydro-québec's experience with high voltage xlpe insulated ... · pdf filehydro...

ICC Fall meeting, Dallas, Texas, September10, 2003

Hydro Quebec experience with High Voltage XLPE insulated cables

Hydro-Québec's experiencewith High Voltage

XLPE insulated Cable SystemsRay Awad Alex Canaan

Christian Royer PirelliPierre BoyerMartin ChoquetteRaphaël GignacJean-Luc ParpalHydro-Québec

AA



§§ IntroductionIntroduction§§ HydroHydro--Quebec underground transmission systemQuebec underground transmission system§§ HV XLPE insulated cable and accessories technologyHV XLPE insulated cable and accessories technology§§ Main steps in technology switchMain steps in technology switch§§ First 120 kV cable projectFirst 120 kV cable project§§ 230kV and 315 kV cables230kV and 315 kV cables§§ Cost reduction solutionsCost reduction solutions§§ Partnership agreementPartnership agreement§§ New cable system designNew cable system design§§ Civil workCivil work§§ First project using the new cable systemFirst project using the new cable system§§ ConclusionConclusion§§ Question periodQuestion period

Presentation outline



HydroHydro--Quebec Underground Quebec Underground HV Transmission SystemHV Transmission System



Territoire Ouest74 lignes 120 kV- 132.1 km

4 lignes 315 kV - 7.9 kmTerritoire Sud

80 lignes 120 kV – 25.4 km10 lignes 230 kV - 3.6 km1 ligne 450 kV - 5.5 km

Territoire Est3 lignes 69 kV – 8.2 km

14 lignes 315 kV – 6.0 km



The rate of increase in the underground HV Cables

Croissance des lignes souterraines

0

20

40

60

80

100

120

140

160

180

200

1940 1950 1960 1970 1980 1990 2000

Année d'installation

Km

de

ligne

s

Câble à sec

Câble à l'huile



HV XLPE insulated Cable Technologyswitch from Oil Filled to XLPE

§§ In 1987 Hydro In 1987 Hydro QuebecQuebec decideddecided to use to use XLPE XLPE insulatedinsulated cablescables for for thethe 120 kV 120 kV underground networkunderground network

§§ TechnoTechno--economicaleconomical studiesstudies showedshowed thatthatcostcost ofof new new lineslines willwill bebe reducedreduced by 15% ;by 15% ;

§§ Maintenance Maintenance costcost willwill bebe reducedreduced by 50%by 50%§§ ThreeThree new new projectsprojects werewere plannedplanned for in for in

service dates service dates betweenbetween 1990 1990 andand 19911991



The main steps

§§ Qualification Qualification testingtesting ofof thethe new new cablescables§§ RethinkingRethinking ofof thethe design design parametersparameters ((cablescables, ,

accessoriesaccessories andand installation); installation); ductsducts, joints , joints arrangement arrangement andand anchoringanchoring etc.etc.

§§ PurchasingPurchasing ofof new new toolstools§§ Training Training ofof Hydro Hydro QuebecQuebec splicerssplicers on on actualactual

cablescables andand accessoriesaccessories§§ New New policypolicy on on cablecable andand accessoriesaccessories sparespare

materialsmaterials



First 120 kV Cable Project

§§ 120 kV, 5,2 120 kV, 5,2 kmkm betweenbetween BelangerBelanger andand RosemontRosemontSS in SS in MontrealMontreal

§§ CableCable : : §§ 1600 MCM (811 1600 MCM (811 sq.mmsq.mm), ), CuCu. . ConductorConductor, , §§ IsulationIsulation thicknessthickness 21,6 mm 21,6 mm §§ MetallicMetallic sheathsheath: : leadlead alloyalloy§§ OuterOuter sheathsheath: Black : Black PolyethylenePolyethylene withwith graphite graphite coatingcoating§§ AccessoriesAccessories : :

FF Joints: Joints: PremouldedPremoulded, , sectionalizedsectionalized withwith coppercoppercasing casing andand outerouter heatheat shrinkableshrinkable sleevessleeves andand tappingtapping

FF PotheadsPotheads: : PremouldedPremoulded stress stress conescones andand porcelainporcelain



First 120 kV Cable project

§§ AverageAverage cablecable lengthlength: 350 m: 350 m§§ Cross Cross BondingBonding SystemSystem: Transposition : Transposition withwith

Zinc Zinc OxideOxide lightninglightning arrestersarresters§§ Installation:Installation:§§ CablesCables in in ductsducts andand joints in joints in manholesmanholes ((rigidlyrigidly

clampedclamped))§§ CablesCables werewere producedproduced usingusing Triple extrusion Triple extrusion

andand DRY CURING DRY CURING processprocess



230 kV and 315 kV XLPE cables

§§ NineNine 230 kV new circuits 230 kV new circuits werewere addedadded in in 19911991--1992 1992 atat a thermal a thermal powerpower stationstation

§§ Qualification Qualification testingtesting on on thethe 315 kV (400 315 kV (400 kVkVclass) class) werewere carriedcarried out in 1995out in 1995--19961996

§§ On supplier On supplier qualifiedqualified hishis cablescables for 500 kV for 500 kV classclass

§§ FirstFirst projectproject isis plannedplanned for 2004 for 2004



Cost reduction the new challenge

§§ In 2000, Hydro In 2000, Hydro QuebecQuebec strategicstrategic plan plan (2000(2000--2004) 2004) requestedrequested thatthat underground underground HV HV cablescables shouldshould bebe mademade more more competetivecompetetive withwith OHTL OHTL

§§ CostCost reductionreduction waswas in in orderorder



Cost reduction solutionsCost reduction solutions



Engineering 7%

Procurement 35 %

Civil work 25 %

Cable Installation 11 %

Other 22%

Cost breakdown in a standard 120 kV project



Cost reduction solutionsCost reduction solutions

36 solutions 36 solutions werewere evaluatedevaluated§§ Close interactions Close interactions betweenbetween solutionssolutions§§ Local Local regulationsregulations werewere takentaken intointo

considerationconsideration§§ MidMid termterm andand long long termterm solutions are solutions are stillstill

underunder considerationconsideration



Cost reduction solutions, main categories

§§ ProcurementProcurement : Changes in : Changes in cablecable design (design (lighterlighter cablescables, , longer longer lengthslengths, , reducedreduced insulationinsulation thicknessthickness etc.)etc.)

§§ Civil Civil workwork : : IntroducingIntroducing prefabricatedprefabricated joint joint baysbays§§ OtherOther costscosts : : ReductionReduction of of projectproject durationduration fromfrom threethree

yearsyears to 18 to 18 monthsmonths



Partnership agreementPartnership agreement



Partnership agreement

§§ DevelopmentDevelopment of new of new cablecable designdesign§§ ReductionReduction of of eprocurementeprocurement leadlead timetime§§ Optimal design, engineering Optimal design, engineering andand installationinstallation§§ ReductionReduction of of strategicstrategic sparespare materialmaterial



New cable system designNew cable system design



New cable system designNew cable system design

850 m850 m550 m550 mMax Max lengthlength

19 kg 19 kg /m/m24 kg 24 kg //mmWeightWeight

7 kV7 kV//mmmm5 kV5 kV//mmmmWorkingWorkingstressstress

86 mm86 mm103 mm103 mmDiameterDiameter

4 mm4 mm4 mm4 mmPE jacketPE jacket

2,8 mm2,8 mm3,2 mm3,2 mmLeadLead

13,7 mm13,7 mm21,6 mm21,6 mmInsulationInsulation

811 mm2811 mm2811 mm2811 mm2ConductorConductor

New New designdesign

OldOlddesigndesign



Qualification testing

§§ BendingBending testtest§§ PD PD measurementmeasurement§§ Tan d Tan d measurementmeasurement§§ 30 cycles 30 cycles atat 150 kV150 kV§§ Hot impulse 650 kV Hot impulse 650 kV

BIL (10 +, 10BIL (10 +, 10--))§§ AC 230 kV, 1 AC 230 kV, 1 hourhour§§ Impulse Impulse andand HVAC HVAC

test to test to breakdownbreakdown



Civil workCivil work



Civil work

ØØ PremouldedPremoulded Joint Joint baysbays

§§ SmallerSmaller dimensionsdimensions§§ FasterFaster instalationinstalation§§ Longer Longer cablecable

lengthslengths allowedallowed

850 m850 m500 m500 mMax Max lengthlength

1 1 dayday3 3 weeksweeksWorkWorkdurationduration

111 m111 m³³240 m240 m³³Volume to Volume to excavateexcavate

2,6 m2,6 m4 m4 mDepthDepth

1,6 m1,6 m2,8 m2,8 mHeightHeight

2,1 m2,1 m2,6 m2,6 mWidthWidth

5,8 m5,8 m8,8 m8,8 mLengthLength

RigidRigidFlexibleFlexibleAnchoringAnchoring

New New Joint Joint baybay

TraditionalTraditionalManholeManhole

§§ Maintenance freeMaintenance free



First project using the new First project using the new cable systemcable system



Mt-Royal/Royalmount 120 kV project

§§ Circuit Circuit lengthlength 4,2 km4,2 km§§ 5 5 PremouldedPremoulded joint joint baysbays§§ AverageAverage lengthlength betweenbetween baysbays 700 m (700 m (waswas

350 m)350 m)§§ 1 new transition compound (OHTL to UG)1 new transition compound (OHTL to UG)§§ Total Total projectproject durationduration 11 11 monthsmonths for for

procurementprocurement, construction , construction andandcommissionningcommissionning



Cost reduction achievedCost reduction achieved



Procurement 35 %34% reduction

Global cost reduction 25%

Engineering 7%

Civil works 25 %

Cable Installation 11 %

Others 22%

Breakdown of cost of first project using new cable system

Économie de 27%

27% reduction

16% reduction



CONCLUSION

§ XLPE insulated high voltage cablesare reliable, environnment friendly, easy to install and maintain§ Performance record (over 14 years)

has been very satisfactory§ Cost reduction is possible by

rethinking of cable and accessoriesdesign as well as installation technique selection



Questions ?Questions ?

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