Medium Voltage Power Cables up to 30 kV with XLPE-insulation
The XLPE-insulation possesses very good electrical, mechanical and thermal characteristics in medium voltage networks. This type of insulation is excellent chemical resistant and also resistant to cold. Due to various advantages, the XLPEinsulated type has vastly displaced the traditional classical paper insulated types in many sectors.
The XLPE-insulated medium voltage cables are designed with longitudinally water-proof. In comparison to PVC and paper-insulated cables, the advantages of XLPE-insulated medium voltage power cables are possessing a low dielectric factor.
The good properties of XLPE-insulated cables remain constant at a long temperature range. These cables can be laid in earth, in air or in tubes.
XLPE-insulated medium voltage cables have now been used for distribution in public supply systems for about 25 years. Because of their numerous advantages they have steadily displaced the classical paper-insulated cables in many countries.
Even nowadays, conductors for MV cables to Swiss standards are made of braided round copper wires. The inner and outer cross-linked semiconductor is welded permanently with the XLPE insulation. For EPR insulation, on the other hand, the outer semiconductor is glued.
The screening is formed by the outer semiconductor layer, together with a layer of round copper wires. A suitable screening cross-section is assigned to each conductor cross-section. The copper wire screening is held together by a copper band, also ensuring the electrical cross-connection between the copper wires. Lengthwise water-tightness is guaranteed by embedding the copper sheath in expansion strips.
Protection against corrosion is provided by a halogen-free black outer casing with two lengthwise red stripes.
Three single conductor cables can be braided together to make a triple-conductor or triple-casing cable. If cable laying conditions are difficult, it is also possible to lap the cables with tensile and protective armouring which consists of a layer of galvanised flat steel wires.
KABELWERK EUPEN' experience in the field of Medium Voltage Cable goes back to the early 30s of the 20th century. Todays modern XLPE-insulated cables have completely replaced the impregnated paper insulated cables since.
Our crosslinked polyethylene insulation are triplex-extruded, dry-cured and provide excellent electrical, mechanical, thermal and chemical charateristics.
Our product range covers the voltage classes from 3,6/6 kV up to 20,8/36 kV with conductor cross-sections up to 630 mm² (aluminium) resp. 500 mm² (copper).
They can be produced according to various national or international standards as NBN, VDE, IEC,...
Available additional features include enhanced fire behaviour, longitudinal- and transversal watertightness, armourings, lead-sheaths...
The progressive design of the TRI-DELTA® cable leads to a longer service life of this medium voltage cable.
With continuous further development from 1990, LEONI Studer AG has made the plastic insulated medium voltage cable more compact and lighter by replacing the steel reinforcement of the three-core cable with an extremely tough sheath. At the same time the copper wire shield was replaced by a hermetically sealed longitudinally and transversely water-proof tubular aluminum shield.
The name TRI-DELTA® comes from the triangular cross-section form of the three-wire cable. As a solution to the problem of “water trees” in polymer-insulated cables the TRI-DELTA® cable provides a «dry» medium voltage cable for the first time on the Swiss market.
TRI-DELTA® cables have the certificate «SEV Plus» for conformity and quality. They meet the special SEV quality requirements for plastic insulated medium voltage cables.
