The high voltage XLPE Cable Systems has a long time development.
At present, numerous high voltage XLPE cable systems with nominal voltages up to 500 kV and with circuit lengths up to 40 km are in operation worldwide.
All the cable systems are equipped with accessories,which have passed the relevant type tests pursuant to national and international standards,such as long-duration tests,the Prequalification Test on a 400 kV XLPE Cable System according to the relevant international standard IEC 62067 (2001).This test required one year of operation, along with the thermal monitoring of all cables, joints and terminations installed.
Depending on the customer’s specifications it can be equipped with a longitudinal water barrier made of hygroscopic tapes or powder. The main insulation is cross-linked under high pressure and temperature. The metallic sheath shall carry the short-circuit current in case of failure. It can be optionally equipped with fibers for temperature monitoring. Finally, the outer protection consists of extruded Polyethylene (PE) or Polyvinylchloride (PVC) and serves as an anti-corrosion layer.Optionally it can be extruded with a semiconducting layer for an after-laying test and additionally with a flame-retardant material for installation in tunnels or buildings if required.
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