Jklyj overhead line conductor 1kV overhead line overhead cable 70 95 120 150 185 overhead line
Overhead line is a line which is erected by tower to transmit electric energy at a certain height. For the high-voltage transmission and distribution network, the ground insulation of the overhead line is generally based on air, and the distribution line (except 380V under 10kV) generally uses bare conductor. However, due to the complex urban distribution environment, short-circuit grounding and lightning strike often occur, resulting in the decrease of power supply reliability. So far, the overhead line under 10kV generally uses insulated conductor (that is, the outer layer of conductor is wrapped with insulation layer), which is the so-called insulated overhead cable.
Cable Size | Current Rating (Note 1) | Short Circuit Rating (Note 2) | Conductor Resistance @ 20°C | Conductor Resistance (ac) @ 80°C | Self Supporting System | Supporting Core System | |||||||
Induction Reactance @ 50Hz | Impendance (z) @ 50Hz at 80°C |
Supporting Core Size | Induction Reactance @ 50Hz | Impendance (z) @ 50Hz at 80°C |
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mm² | (A) | kA | ( /km) | ( /km) | ( /km) | ( /km) | mm² | ( /km) | ( /km) | ||||
25 | 105 | 2.3 | 1.200 | 1.490 | 0.096 | 1.493 | 54.6 | 0.101 | 1.493 | ||||
35 | 144 | 3.2 | 0.868 | 1.078 | 0.096 | 1.082 | 54.6 | 0.097 | 1.082 | ||||
50 | 183 | 4.6 | 0.641 | 0.796 | 0.090 | 0.801 | 54.6 | 0.089 | 0.801 | ||||
70 | 228 | 6.4 | 0.443 | 0.550 | 0.089 | 0.557 | 54.6 | 0.086 | 0.557 | ||||
95 | 277 | 8.5 | 0.320 | 0.397 | 0.086 | 0.406 | 54.6 | 0.081 | 0.405 | ||||
120 | 322 | 11.0 | 0.253 | 0.314 | 0.084 | 0.325 | 70 | 0.079 | 0.324 | ||||
150 | 350 | 13.8 | 0.206 | 0.256 | 0.082 | 0.269 | 95 | 0.079 | 0.268 |
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