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Hydro-Québec's experience with High Voltage XLPE insulated Cable Systems

Hydro-Québec's experience with High Voltage XLPE insulated Cable Systems. Ray Awad Alex Canaan Christian Royer Pirelli Pierre Boyer Martin Choquette Raphaël Gignac Jean-Luc Parpal Hydro-Québec. Presentation outline. Introduction

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Hydro-Québec's experience with High Voltage XLPE insulated Cable Systems

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  1. Hydro-Québec's experience with High Voltage XLPE insulated Cable Systems Ray Awad Alex Canaan Christian Royer Pirelli Pierre Boyer Martin Choquette Raphaël Gignac Jean-Luc Parpal Hydro-Québec

  2. Presentation outline • Introduction • Hydro-Quebec underground transmission system • HV XLPE insulated cable and accessories technology • Main steps in technology switch • First 120 kV cable project • 230kV and 315 kV cables • Cost reduction solutions • Partnership agreement • New cable system design • Civil work • First project using the new cable system • Conclusion • Question period

  3. Hydro-Quebec Underground HV Transmission System

  4. Territoire Est 3 lignes 69 kV – 8.2 km 14 lignes 315 kV – 6.0 km Territoire Ouest 74 lignes 120 kV- 132.1 km 4 lignes 315 kV - 7.9 km Territoire Sud 80 lignes 120 kV – 25.4 km 10 lignes 230 kV - 3.6 km 1 ligne 450 kV - 5.5 km

  5. The rate of increase in the underground HV Cables

  6. HV XLPE insulated Cable Technology switch from Oil Filled to XLPE • In 1987 Hydro Quebec decided to use XLPE insulated cables for the 120 kV underground network • Techno-economical studies showed that cost of new lines will be reduced by 15% ; • Maintenance cost will be reduced by 50% • Three new projects were planned for in service dates between 1990 and 1991

  7. The main steps • Qualification testing of the new cables • Rethinking of the design parameters (cables, accessories and installation); ducts, joints arrangement and anchoring etc. • Purchasing of new tools • Training of Hydro Quebec splicers on actual cables and accessories • New policy on cable and accessories spare materials

  8. First 120 kV Cable Project • 120 kV, 5,2 km between Belanger and Rosemont SS in Montreal • Cable : • 1600 MCM (811 sq.mm), Cu. Conductor, • Isulation thickness 21,6 mm • Metallic sheath: lead alloy • Outer sheath: Black Polyethylene with graphite coating • Accessories : • Joints: Premoulded, sectionalized with copper casing and outer heat shrinkable sleeves and tapping • Potheads: Premoulded stress cones and porcelain

  9. First 120 kV Cable project • Average cable length: 350 m • Cross Bonding System: Transposition with Zinc Oxide lightning arresters • Installation: • Cables in ducts and joints in manholes (rigidly clamped) • Cables were produced using Triple extrusion and DRY CURING process

  10. 230 kV and 315 kV XLPE cables • Nine 230 kV new circuits were added in 1991-1992 at a thermal power station • Qualification testing on the 315 kV (400 kV class) were carried out in 1995-1996 • On supplier qualified his cables for 500 kV class • First project is planned for 2004

  11. Cost reduction the new challenge • In 2000, Hydro Quebec strategic plan (2000-2004) requested that underground HV cables should be made more competetive with OHTL • Cost reduction was in order

  12. Cost reduction solutions

  13. Cost breakdown in a standard 120 kV project Engineering 7% Other 22% Procurement 35 % Cable Installation 11 % Civil work 25 %

  14. Cost reduction solutions 36 solutions were evaluated • Close interactions between solutions • Local regulations were taken into consideration • Mid term and long term solutions are still under consideration

  15. Cost reduction solutions, main categories • Procurement : Changes in cable design (lighter cables, longer lengths, reduced insulation thickness etc.) • Civil work : Introducing prefabricated joint bays • Other costs : Reduction of project duration from three years to 18 months

  16. Partnership agreement

  17. Partnership agreement • Development of new cable design • Reduction of eprocurement lead time • Optimal design, engineering and installation • Reduction of strategic spare material

  18. New cable system design

  19. New cable system design

  20. Qualification testing • Bending test • PD measurement • Tan d measurement • 30 cycles at 150 kV • Hot impulse 650 kV BIL (10 +, 10-) • AC 230 kV, 1 hour • Impulse and HVAC test to breakdown

  21. Civil work

  22. Civil work • Premoulded Joint bays • Smaller dimensions • Faster instalation • Longer cable lengths allowed • Maintenance free

  23. First project using the new cable system

  24. Mt-Royal/Royalmount 120 kV project • Circuit length 4,2 km • 5 Premoulded joint bays • Average length between bays 700 m (was 350 m) • 1 new transition compound (OHTL to UG) • Total project duration 11 months for procurement, construction and commissionning

  25. Cost reduction achieved

  26. Breakdown of cost of first project using new cable system Engineering 7% Others 22% 27% reduction Procurement 35 % 34% reduction Cable Installation 11 % 16% reduction Civil works 25 % Économie de 27% Global cost reduction 25%

  27. CONCLUSION • XLPE insulated high voltage cables are 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 accessories design as well as installation technique selection

  28. Questions ?

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