1.4 0584 improving mv cable system specifications

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  • 1. “SmartLife”Underground Cable User GroupImproving MV Cable System Specifications1Piet SoepboerConsultant LV/MV Cables & AccessoriesAsset ManagementSOEPBOER – NL – S1 – 0584
  • 2. SOEPBOER – NL – S1 – 0584“SmartLife”Underground Cable User GroupStudy topics for 2012-2013:• Data collection and health index.• Improving cable system specifications.• Diagnostic techniques.• Laboratory tests.
  • 3. Cable system specificationsSOEPBOER – NL – S1 – 0584Goal: To obtain and maintain quality.?
  • 4. Issues for cable system specificationsSOEPBOER – NL – S1 – 0584
  • 5. Topics for consideration:- Workshop Improving Cable System Specifications -SOEPBOER – NL – S1 – 05841. Discuss the completeness of the functional requirements.2. Assess the quality level requested.3. If possible: propose improvements.
  • 6. Main failure causes in cable systemsSOEPBOER – NL – S1 – 0584Cables:1. Damage to the outer sheath due to third party activities.2. Rough handling of cables by contractors.3. External influences (e.g. stones, roots).
  • 7. Main failure causes in cable systemsSOEPBOER – NL – S1 – 0584Joints:1. Bad workmanship during installation.2. Moisture ingress.3. Overheating.
  • 8. Cable system specifications in generalSOEPBOER – NL – S1 – 0584CablesJoints
  • 9. SOEPBOER – NL – S1 – 0584IEC 60502-2 HD 620 Section 10JHD 620 Section 10CHD 620 Section 10IHD 620HD 620 Section 10EHD 620 Section 10GDe afbeelding kan momenteel niet worden weergegeven.HD 620 Section 10ADe afbeelding kan momenteel niet worden weergegeven.HD 620 Section 10LHD 620 Section 10BDe afbeelding kan momenteel niet worden weergegeven.Our cable specifications in general
  • 10. Our joint specifications in generalSOEPBOER – NL – S1 – 0584IEC 61238-1EN 61442HD 629
  • 11. Some concerns at cable specificationsSOEPBOER – NL – S1 – 0584• Semi conducting screens.• Mechanical protection.New requirementsor tests needed?
  • 12. Conductor materialSOEPBOER – NL – S1 – 0584IEC 60228 incomplete?Copper:• requirements on conductor resistance.Aluminium:• requirements on conductor resistance and tensile strength.• importance of hardness?• importance of aluminium purity?• Importance of conductor diameter?
  • 13. Semi-conducting screensSOEPBOER – NL – S1 – 0584France : MSX1, MSX2Other countries : ?Requirements: ?Compounds:• Electrical resistivity ?• Aging test ?• Tensile strength ?• Elongation at break ?Screens:• Irregularities ?• Indentation of metallic screen ?
  • 14. Armour vs. main failure causesSOEPBOER – NL – S1 – 0584
  • 15. Concerns at joint specifications (tests)SOEPBOER – NL – S1 – 0584
  • 16. Some missing pieces at type testing jointsSOEPBOER – NL – S1 – 0584
  • 17. SOEPBOER – NL – S1 – 0584
  • 18. Curious?Read Paper 0584!Utilities interested in Smartlife’s Cable User Group:Chairman: jurgen.mutsaers@enexis.nlRecommendationsSOEPBOER – NL – S1 – 0584