Wind Energy

Standard conditions for current rating The tabled values for the current rating were calculated according to IEC 287 for the following standard conditions: Continuous operation single circuit for 3--phase current, single conductor for 1--phase current 30 °C ambient temperature and sufficiently large and ventilated spaces, whose ambient temperature is not appreciably increased by the heat coming from the cables. 120 °C conductor temperature. Frequency up to 200 Hz. Installation in air, unrestricted heat dissipation, means that the following installation conditions are observed: Distance of the cables from the wall, from the floor, from the ceiling greater than cable diameter. Distance between two adjacent power circuits greater than 2 x cable diameter. Vertical distance between power circuits laid one upon another for individual cables greater than 2 x cable diameter and for layers of cables > 200 mm Perforated tray with a perforation > 30 % of the total surface. Open trays are continuous supports with vertical sides, but without cover. A possible perforation accounts for < 30% of the total surface. Closed ducts are entirely closed. Pipes belong to this category also. The max. filling degree is 70%. 0 De rating Factors for Deviating Ambient Temperature (Basis 30 C) Reduction Factors for Different Conductor Temperature Ambient 0 Temp. C Reduction Factor RF1 0 Conductor Temp. C Maximum permitted typical conductor temperature for various insulation materials according to IEC 60216 (20000 h/50 % Elongation at break) 0 Current Rating C PVC,FRLS XLPE & EPR(Chemical cured) 120 Siechem EBXL - XLPO 120 Material 0 Temperature C 70 20 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 1.05 1.00 0.97 0.94 0.91 0.88 0.85 0.82 0.78 0.75 0.71 0.67 0.62 0.58 0.53 0.47 0.41 0.33 0.22 Reduction Factor RF 2 120 110 100 90 80 70 0.72 0.79 0.85 0.91 0.96 1 90 Siechem EBXL - XLPE 88 All information given are in good faith.Siechem's liability is only to replace the defective portion of cables provided the same is mutually established as manufacturing defects within the guarantee period as agreed in writing and Siechem shall not be liable for any compensation or damages. Siechem reserves the right to revise any of the above specifications without prior intimation. Subject to Chennai Jurisdiction. Wires & Cables