Post on 13-Jun-2015
“SmartLife”Underground Cable User Group
Improving MV Cable System Specifications
1
Piet SoepboerConsultant LV/MV Cables & AccessoriesAsset Management
SOEPBOER – NL – S1 – 0584
SOEPBOER – NL – S1 – 0584
“SmartLife”Underground Cable User Group
Study topics for 2012-2013:
• Data collection and health index.
• Improving cable system specifications.
• Diagnostic techniques.
• Laboratory tests.
Cable system specifications
SOEPBOER – NL – S1 – 0584
Goal: To obtain and maintain quality. ?
Issues for cable system specifications
SOEPBOER – NL – S1 – 0584
Topics for consideration:- Workshop Improving Cable System Specifications -
SOEPBOER – NL – S1 – 0584
1. Discuss the completeness of the functional requirements.
2. Assess the quality level requested.
3. If possible: propose improvements.
Main failure causes in cable systems
SOEPBOER – NL – S1 – 0584
Cables:
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).
Main failure causes in cable systems
SOEPBOER – NL – S1 – 0584
Joints:
1. Bad workmanship during installation.
2. Moisture ingress.
3. Overheating.
Cable system specifications in general
SOEPBOER – NL – S1 – 0584
CablesJoints
SOEPBOER – NL – S1 – 0584
IEC 60502-2 HD 620 Section 10JHD 620 Section 10C
HD 620 Section 10I
HD 620
HD 620 Section 10E
HD 620 Section 10G
De afbeelding kan momenteel niet worden weergegeven.
HD 620 Section 10A
De afbeelding kan momenteel niet worden weergegeven.
HD 620 Section 10L
HD 620 Section 10B
De afbeelding kan momenteel niet worden weergegeven.
Our cable specifications in general
Our joint specifications in general
SOEPBOER – NL – S1 – 0584
IEC 61238-1
EN 61442HD 629
Some concerns at cable specifications
SOEPBOER – NL – S1 – 0584
• Semi conducting screens.
• Mechanical protection.
New requirements or tests needed?
Conductor material
SOEPBOER – NL – S1 – 0584
IEC 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?
Semi-conducting screens
SOEPBOER – NL – S1 – 0584
France : MSX1, MSX2Other countries : ?
Requirements: ?
Compounds:• Electrical resistivity ?• Aging test ?• Tensile strength ?• Elongation at break ?
Screens:• Irregularities ?• Indentation of metallic screen ?
Armour vs. main failure causes
SOEPBOER – NL – S1 – 0584
Concerns at joint specifications (tests)
SOEPBOER – NL – S1 – 0584
Some missing pieces at type testing joints
SOEPBOER – NL – S1 – 0584
SOEPBOER – NL – S1 – 0584
Curious?
Read Paper 0584!
Utilities interested in Smartlife’s Cable User Group:
Chairman: jurgen.mutsaers@enexis.nl
Recommendations
SOEPBOER – NL – S1 – 0584