FEATURE NEWS:
Vulcanisation of High Voltage Cables
Officine Meccaniche ITAL SpA, now called ITAL Srl, Italy, was founded in 1959 when it began building machines for rubber and plastic and then specialised, over the years, in lines for the production of electrical cables.
Medium and high tension cables are normally insulated on double or triple extrusion lines and con-tinuous vulcanisation in catenary or in vertical. The catenary vulcanization is used normally for ca-bles at medium and high voltage, up to about 140 KV. The cables at very high voltage, more than 140 KV, are insulated with extrusion and vertical vulcanisation.
The vulcanization method can be made in three different ways:
A) Vulcanization system at steam with cooling at water for cables up to 30 kV.
B) Vulcanization system at gas and cooling at water for cables from 30 to 60 kV.
C) Gas vulcanization system and gas cooling for cables from 60 kV and onwards.
The choice of the vulcanization type is made considering the technical specifications of the cable and of the insulation tests that will be submitted. The gas system has been considered until today to be the better system to obtain a very good insulation especially for cables at high tension. It is how-ever also the most expensive system.
In many cases, for cables at medium-low tension, not more than 25 kV, they can be insulated
with silanic materials, with traditional lines for PVC-PE- . The reticulation happens for chemical ef-fect in heated chambers (sauna) or in baths at hot water (about 80°C).
The line is complete also with a screening machine SZ for steel wires and a firth extruder for an ex-ternal sheath made of PVC.
The cable described above is made according to the international rules AEIC CS7/93 IEC 502 – ICEA S66-524, produced by IMSA Argentina on extrusion line Ital Busto A.
Company: |
Officine Meccaniche ITAL SpA |
Country: |
Italy |
Fax: |
+39 0331 686436 |
Email: |
|
Website: |
www.ital.it |