Cable News Alerts (CNA)- The Leading Source of Industry News on Power Cables and Cable Insulation
NEWSMAKERS: * Brugg Cable * CNA * ExcelPlas * LS Cable * Nexans * NKT * Prysmian * Sumitomo * XLPE
INDUSTRY NEWS
Nexans Study – Thermal Oxidation of Cross-linked PE and EPR Used as Insulation Materials: Multi-scale Correlation Over a Wide Range of Temperatures
https://www.sciencedirect.com/science/article/pii/S0142941820321425!
Case Analysis on the Abnormal Heating Defect of a 220kv XLPE Cable Intermediate Joint
https://iopscience.iop.org/article/10.1088/1755-1315/610/1/012008/pdf
Australia’s Specialized Cable Testing Laboratory – NATA Accredited
ExcelPlas – Your Cable Testing Laboratory
Chemical / Physical / Durability / Mechanical Testing of Cable Products
https://www.excelplas.com/wp-content/uploads/2020/01/Excelplas-A4-Brochure-4pp-Cable-Testing-NTs.pdf
Prysmian Flagship Cable Plant to Become Net Zero Unit
http://tradearabia.com/news/IND_377863.html
KMT acquires NKT’s recycling business in Denmark and the Parties Enter into an Agreement on Continued Recycling of Cables
https://www.nkt.com/news-press-releases/kmt-acquires-nkt-s-recycling-business-in-stenlille-in-denmark-and-the-parties-enter-into-an-agreement-on-continued-recycling-of-cables
NKT SUPPLIES 36 AND 72 KV POWER CABLES FOR GREEN ENERGY PARKS
https://www.cabletechnologynews.co.uk/nkt-supplies-36-and-72-kv-power-cables-for-green-energy-parks/
Sumitomo Awarded Submarine Cable System for Alaska
http://tradearabia.com/news/OGN_377579.html
All Saint-Brieuc Inter-Array Cables to Be Buried Using Tool from Prysmian
https://www.offshorewind.biz/2020/12/04/all-saint-brieuc-inter-array-cables-to-be-buried/
Determination of End of Life of Cables
End of life (EOL) vary with the cable type, the installation and conditions under which the cable is operated, and vary from installation to installation. Cable life can be extended in most cases, depending on the condition of the cable. The lifetime of a power cable depends on its ability to carry the rated current safely at the rated voltage without excessive loss or failures. Cable failure is a breakdown of the insulation surrounding the conductor and subsequent leakage of current to earth or between conductors. Insulation breakdown may be total, resulting in a high fault current, resulting in leakage current. On the technical side, medium voltage cables fail due to a phenomenon called water trees. Water trees can grow from the inside of the cable out, from the outside of the cable in, or from defects within the insulation. As they grow, they look like trees or bushes. Water trees grow until they can no longer hold the voltage stress and an electric tree is formed. Once an electrical tree is formed, the cable usually fails within two weeks.
Failure results as partial discharges erode the wall of the void in which they occur. The erosion of each discharge in a void increases the size of the void and so decreases the partial discharge inception and extinction voltages for that void. This self-acceleration means that any PD occurring at operating voltages is likely to lead to rapid failure.
https://www.excelplas.com/wp-content/uploads/2020/01/Excelplas-A4-Brochure-4pp-Cable-Testing-NTs.pdf
Estimating and Extending Electric Cable Life
https://constructionreviewonline.com/2017/10/estimating-extending-electric-cable-life/
NEW RESEARCH
Crosslinking Dependence of Direct Current Breakdown Performance for XLPE-PS Composites at Different Temperatures
https://search.proquest.com/openview/1cba6be203542154066bad038ab276ca/1?pq-origsite=gscholar&cbl=2032345
Grafted UV Absorber as Voltage Stabilizer Against Electrical Degradation and Breakdown in Cross-linked Polyethylene for High Voltage Cable Insulation
https://www.sciencedirect.com/science/article/pii/S0141391021000185
The Effect of Insulation Characteristics on Thermal Instability in HVDC Extruded Cables
https://www.mdpi.com/1996-1073/14/3/550/pdf
A New Analytical Model for Predicting the Radio-thermal Oxidation Kinetics and the Lifetime of Electric Cable Insulation in Nuclear Power plants – Application to Silane Cross-linked Polyethylene
https://www.sciencedirect.com/science/article/pii/S0141391021000124#!
New Insight into Polyethylene Electrical Breakdown: An Molecular Dynamics Study
https://aip.scitation.org/doi/abs/10.1063/5.0033645
Recent Advances in Polymer Nanocomposites Based on Polyethylene and Polyvinylchloride for Power Cables
https://www.mdpi.com/1996-1944/14/1/66/pdf
Water Tree Propagation in a Wide Temperature Range: Insight into the Role of Mechanical Behaviours of Crosslinked Polyethylene (XLPE) Material
https://www.mdpi.com/2073-4360/13/1/40/pdf
Recyclable Polypropylene-based Insulation Materials for HVDC Cables: Progress and Perspective
https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9299504
Influence of Charge Emission Behaviour of Semi-Conductive Shielding Layer on Charge Accumulation Properties of Insulation Layer of HVDC Cables
https://iopscience.iop.org/article/10.1088/2053-1591/abcf7b/pdf
REPORTING & MARKET TOOLS
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This Newsletter is brought to you by the Australian Cable Material Testing Laboratory (NATA Certified)
ExcelPlas Cable Insulation Testing Laboratory Capabilities:
-DSC Thermal Analysis to identify melting point, Glass transition (Tg) and Thermal Stability (OIT)
-FTIR Infra-red Analysis for compositional analysis of polymers and additives
-TGA Thermogravimetric Analysis for weight loss with loss of additives, oils, polymer decomposition, filler levels
-X-Ray Analysis (EDS/XRD) to identify the crystalline phase and composition of inorganic additives
-Carbon Black Content (ASTM D1603, AS/NZS 2904 Clause 7.4.5 which uses AS 1463 Appendix B)
-Carbon Black Dispersion
-Oxidative Induction Time (OIT)
-Melt Flow Index (MFR)
-Stress Cracking Resistance Testing (ESCR testing)
-Failure Analysis (processing, water treeing, contamination ID, etc)
http://excelplas.com/
Examples of Polymer Materials Excelplas Can Test:
XLPE and HDPE Cable Insulation Testing (QA, QC, incoming raw materials)
* PVC (V-90) (Soft (plasticised) Polyvinyl Chloride compound)
* XLPE (X-90, X-HF-110) (Crosslinked Polyethylene)
* Rubber (R-EP-90, R-HF-90, R-HF-110) (Ethylene Propylene Rubber).
ExcelPlas Undertakes the Following Cable Testing as per AS/NZS 5000 and AS/NZS 3808:
* Measurement of thickness of insulation and sheath (sample test)
* Tensile strength and elongation of insulation and sheath material – before ageing (type test)
* Tensile strength and elongation of insulation and sheath material – after ageing (type test)
* Loss of mass of insulation and sheath (thermoplastic materials only) (type test)
* Pressure test at high temperature of insulation and sheath (thermoplastic materials only) (type test)
* Heat shock (thermoplastic materials only) (sample test)
* Hot set test (cross linked materials only) (type test)
* Exudation of plasticizer (thermoplastic materials only) (type test)
* Compatibility test of cables materials (type test)
Other Cable and Insulation Testing Offered by ExcelPlas NATA Labs:
• Shore A/D Hardness
• Density Determination
• Accelerated Weathering testing
• Charpy and Izod Tensile Tester
• Laboratory press for preparing samples
• Plasticizer extraction analysis apparatus
• Loss in Mass (volatility) analysis
• Limiting Oxygen Index (LOI) Analysis of Cables
• Wire Insulation Abrasion
• Testing Composition of Low Smoke Zero Halogen Cables
• Testing of %Crosslinking of XLPE Cables
• Testing of Tree Retardant XLPE Cables
• Identification of Contamination/Foreign Matter
• Determination of % Carbon Black in Cable Sheathing
• Determination of Filler Content/Composition in Cable Insulation
• Limiting Oxygen Index of Flame Retardant Cables
• Plasticizer Level and Content of PVC Insulated Cables
• Compliance Testing of Important Cable to Ensure it is Compliant with Australian Standards
Copyright 2020 Cable News
www.cablenewsaustralia.com.au
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