Joints - Sterlite

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RATING FACTORS Table 20 RATING FACTORS FOR DEPTH OF LAYING (For cables laid directly in ground) Depth of laying (mm) 500- 750 750- 900 900- 1050 1050- 1200 1200- 1500 1500- 1800 1.1 KV Cables 1.00 0.98 0.96 0.94 0.92 0.90 3.3, 6.6,11 KV Cables - 1.00 0.99 0.98 0.96 0.95 22 & 33 KV Cables - - 1.00 0.99 0.98 0.96 Table 21 GROUP RATING FACTORS FOR MULTI CORE CABLES OR GROUPS OF SINGLE CORE CABLES IN HORIZONTAL FORMATION (For cables laid directly in ground) Number of cables or group of single core cables in same trench Spacing between cables or groups touching 70 mm 250 mm 2 3 4 5 6 0.79 0.85 0.87 0.69 0.75 0.79 Table 22 GROUP RATING FACTORS FOR MULTI CORE CABLES OR GROUPS OF SINGLE CORE CABLES IN AIR ON LADDER SUPPORTS, METAL TRAYS , WALLS etc WITH MAINTAINED SPACING BETWEEN CABLES OR GROUPS Number of cables or group of single core cables Vertically 1 2 3 0.93 0.83 0.76 0.63 0.68 0.75 0.58 0.64 0.72 0.55 0.60 0.69 1 2 Horizontally 3 4 5 1.00 0.89 0.80 0.87 0.79 0.72 0.84 0.76 0.70 0.83 0.75 0.69 4 0.77 0.72 0.68 0.67 0.66 Table 23 RATING FACTORS FOR VARIATION IN GROUND TEMPERATURE (For cables laid directly in ground) GROUND TEMPERATURE ° C RATING FACTOR 15 1.12 20 1.08 Table 24 RATING FACTORS FOR VARIATION IN AMBIENT AIR TEMPERATURE AIR TEMPERATURE ° C RATING FACTOR 20 1.18 25 1.14 Table 25 RATING FACTORS FOR VARIATION IN THERMAL RESISTIVITY OF SOIL Voltage rating of cables 1.1 & 3.3 KV 6.6, 11 & 22 KV 33 KV 25 1.04 30 1.10 30 1.0 35 1.05 35 0.96 40 1.0 40 0.91 45 0.95 45 0.87 50 0.89 Thermal resistivity of soil (° C cm/W) 100 1.18 120 1.08 150 1.0 200 0.88 250 0.81 0.16 1.08 1.0 0.90 0.83 0.12 1.07 1.0 0.90 0.83 50 0.82 55 0.84 300 0.74 0.76 0.78 6 0.82 0.74 0.68 0.65 Issued: June 2012 15
PROCESS FLOW CHART: XLPE INSULATED POWER CABLES (upto 33 kV GRADE) RAW MATERIALS ALUMINIIUM/ COPPER WIRE DRAWING A CONDUCTOR STRANDING XLPE COMPOUND SEMICONDUCTING COMPOUND XLPE TRUE TRIPLE EXTRUSION COPPER TAPE COL. IDENTIFICATION TAPE FILLERS PVC TAPE/ PVC COMPOUND GALVANISED STEEL FLAT STRIPS/ ROUND WIRES (A-I QUALITY CHECKPOINTS) 3 CORE B C COPPER TAPING D LAYING UP OF CORES E INNER SHEATHING (TAPED/ EXTRUDED) F ARMOURING G 1 CORE PACKING OUTER SHEATHING H I Issued: June 2012 16
Page 1 and 2: Sterlite Power Cable Solutions
Page 3 and 4: Manufacturing Process To ensure the
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 13 and 14: ELECTRICAL PARAMETERS (Tables) Tabl
Page 15: ELECTRICAL PARAMETERS (Tables) Tabl

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