XLPE Insulated Power Cable at Rated Voltage 19/33kV
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XLPE Insulated Power Cable at Rated Voltage 19/33kV Executive Standard 7. Wrapping tape: non-woven fabrics. 8. Separating sheath: PVC type 9 as per BS 7655. 9. Armor: aluminum wire for single-core cable, steel wire for multi-core cable. 10. Outer sheath: PVC type 9 as per BS 7655. Technical parameter This products will be manufactured as per BS 6622, BS EN/IEC 60228 standards. Application Scopes The cables are applied to power transmission and distribution system at rated voltage19/33kV. Operating Features 1.Rated Voltage: U0/U(Um): 19/33(36)kV. U0—Rated power frequency voltage between earth and metal shield to conductor for cable design; U—Rated power frequency voltage among conductors for cable design; Um—Bearable max value of “Max System Voltage” for equipment. 2.Max conductor operating temperature at normal operation: 90℃ for XLPE insulation. 3.Max conductor temperature during cable short circuit: 250℃ for XLPE insulation (max. duration is 5 sec.) 4.Min. bending radius of cable during installation: （1）Single-core cable: 15D. （2）Multi-core cable: 12D. D—Actual O.D of cable sample (mm) 5 .Cable Installation The ambient temp of cable installation shall not be less than 0℃, the cable shall be preheated if it is less than 0℃. Cable structure 1. Conductor: category stranded copper conductor as per BS EN/IEC 60228. 2. Conductor screen: semi-conducting screen material. 3. Insulation: XLPE type GP8 as per BS 7655. 4. Insulation screen: semi-conducting screen material. 5. Metallic screen: copper tape or wire screen as per BS 6622. 6. Filler: polypropylene nets PP strip. Electrical Parameters Nom. cross Structure Parameters sect areas Max conductor Outer Weight Operating of conductor diameter (approx.) D.C resistance at capacitance (approx) 20℃ 2 mm2 mm kg/km μF/km ≤Ω/km 50 70 95 120 150 185 240 300 400 Current rating of cable Underground (20℃) Conducto r current at short circuit (5 (5S) S)

Cable current capacity calculation conditions: Both end earthing is applied for cable metallic screen interconnection earthing. Laying in Air 1. Multi-core cable laying: separated cabling laying. (Single cable is laid independent or the heat produced by adjacent cable has no effect on that cable) 2. Single core arrangement: trefoil formation: contact with each other Flat formation: S=De (three cables laid in flat arrangement, the distance between cable cores (s) is the cable outer diameter (De)). 3. Ambient temperature: 30℃. 4. Correction coefficient for current capacity under different...