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Sterlite Medium Voltage (MV) XLPE-insulated Power Cables Product Applications Sterlite(R) Medium Voltage (MV) power cables are crosslinked polyethylene (XLPE-insulated) cables that possess very good electrical, mechanical and thermal characteristics in medium voltage networks. This type of insulation offers excellent chemical resistant, is non-hygroscopic and is resistant to cold. Product Applications Crosslinked polyethylene (XLPE) has become the globally preferred insulation for power cables, both for distribution and transmission system applications. Product Benefits Higher current carrying capacity due to higher permissible continuous conductor temperature 0 Higher Short Circuit rating as it can withstand short circuit temperature up to 250 C 0 Higher temperature to withstand emergency overload up to 130 C Extremely low dielectric losses Light-weight Easier to join and terminate Smaller bending radius 0 Flexible up to -40 C Not prone to fatigue damage due to vibration or loading cycles Typical Product Specifications Conductor: Electrolytic grade Copper or Aluminum, round, multi-wire stranded, circular and compact in various sizes according to IS 8130/ IEC 60228. Conductor Shield: Conductors for cables rated over 3.3 KV are shielded by extruded semi conducting compound which is of bonded type. Insulation: Natural, chemically cross linked polyethylene. Thickness is according to relevant IS or IEC standards. Insulation Shield: Cables rated over 3.3 KV have a non-metallic semi conducting part in combination with a metallic part applied over the insulation. Non-metallic part is generally made of extruded semi conducting compound and is applied together with conductor shield. Insulation in one process (wherever required semi conducting tape/ water swellable tape is provided) can be applied directly over non-metallic insulation screen followed by helically applied bare annealed plain copper tape applied with an overlap. Core Identification: It can be provided by coloured strips applied on core or by printed numerals (1, 2&3) or printed strips. Laying–Up: For multi core cables, the cores are cabled with fillers in the interstices. Inner Sheath (Common Covering): The laid up cores are provided with a common covering either of tape or extrusion of thickness as per relevant standard. Armour: The armour can either be applied directly over core or inner sheath of single core cables and over inner sheath for multi core cables. Aluminium wire or strip constitutes the armour for single core cables where as GI wire or strip constitutes the armour for multi core cables. Outer Sheath: All cables are provided with an extruded inner sheath whose thickness is governed by relevant standard. The PVC of outer sheath conforms to type ST 2 of IS 5831, wherever required “FR”, “FRLS” or “LSOH” can be provided. The colour of outer sheath is generally black. Issued: June 2012 1
Manufacturing Process To ensure the accuracy and precision of the manufacturing process, Sterlite has a state of-the-art plant with top of the line machines enabling control of critical process and quality parameters. All Sterlite production lines are backed up with strong quality assurance systems. This is done by ensuring that all process and test equipments are periodically calibrated with defined benchmarks. Quality Tests The following tests are performed randomly to ensure a better quality: Degree of Cross linking for the Dielectric Void and contamination test involving microscopic inspection of imperfections of the insulation Bonding test of insulation screen with the insulation Online Diameter and eccentricity measurement and control by X-Ray unit, to ensure consistency and accuracy of Insulated core. Further, all Cables produced are subjected to the following routine tests as per IS 7098 (Part-2):1985: High Voltage test Conductor Resistance test Partial Discharge test Tests on conductors Tests on Armour Test for dimensions of insulation and sheath Physical tests for insulation Physical tests for outer sheath Partial Discharge Bending test followed by partial discharge Dielectric Power Factor test as a function of voltage Dielectric Power Factor test as a function of Temperature Insulation Resistance (Volume Resistivity test) Heating cycle test Impulse withstand test High Voltage test (4 hours) Flammability Issued: June 2012 2
Page 1: Sterlite Power Cable Solutions
Page 5 and 6: Operating Conditions: Electrical Pa
Page 7 and 8: DIMENSION AND WEIGHT (Tables) Table
Page 9 and 10: DIMENSION AND WEIGHT (Tables) Table
Page 11 and 12: ELECTRICAL PARAMETERS (Tables) Tabl
Page 17: PROCESS FLOW CHART: XLPE INSULATED

Joints - Sterlite

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