QSo why is it dangerous to coat the cables in insulation?ABecause it would add a lot of weight - and could very seriously risk breaking the lines for not much gain in benefit.
It isn’t needed, the insulation, hence why the power towers are tall to keep the cables away from harming anybody.
QWhy choose stranded wire in electrical applicationAStranded is typically used to enable to pull the wires through conduit. Solid wiring can be passed through short pieces of conduit, but that is about it. Of course, stranded is always used where cables need to flex.
QFLAT CABLEAAlthough flat jacketed cable can be constructed from the same range of wire types as those used in ribbon cable, in practice this configuration is usually restricted to vinyl insulated wires and vinyl jackets. Special techniques have been devised which keep the outer jacket from fusing with the primary insulation, a condition which would make impossible the stripping of the jacket without damage to the individual wire coverings. While opaque jackets are generally specified, transparent materials are available, allowing the color-coded wires to be seen throughout the cable length.
QWhat is benefits of ACSR conductors in transmission and distribution systems?A1.The conductance is higher than copper.
2.ACSR conductor is strong steel core light weight aluminum conductors available in a wide range of steel, which includes a carbon portion of 0.5 - 0.85.
3.These can be produced with flexible stamina in wide ranges as per the purpose for any resistance.
4.These type of conductors are also called as bimetallic conductors because it includes internal and external layers. The internal layers are of steel cables whereas the external layers are light weight aluminum that's hard-drawn.
5.The mechanical efficiency of the ACSR conductor is high.
6.The tensile stamina of the conductor is high.
7.Greater dependability because of the steel cables, which ensures the safety margins of the conductor.
8.Because of the highest mechanical resistance, better transport capacity, and high tensile stamina, the ACSR conductor can be used for medium and long spans and needs much less support.
9.The corona limit is high because of the high size of ACSR.
10.High voltage overhead lines are high.
11.Galvanic rust is avoided and steel cable is protected by covering with zinc.
12.Used for overhead ground cables, river crossings, and long-span installation purposes because of their highest strength.
13.Reduced weight and economical design.
QWhat is rated voltage?AOverhead cable voltage classification：
Low voltage is 0.6-1kV
Medium voltage is 6-35kV
High voltage is 35-500kV
Ultra-high pressure is 500-1000kV
UHV is 1000kV to higher
QWhy don’t we use copper in transmission lines?ADuring high-voltage power transmission, overhead conductors are the main component of overhead power lines, and their role is to transmit power. However, the material of high-voltage transmission conductors is almost aluminum. Why don’t we use copper?
There are three reasons.
1.aluminum as a material for high-voltage transmission lines can save costs
2.The weight of copper as conductor is more than twice that of aluminum . Because the weight of the conductor is very heavy, the pulling force of the wire will be very large due to the action of gravity, and it is easy to break, which is very dangerous. The high-voltage transmission line is twisted into multiple strands, with a steel wire in the center and aluminum wire around. It supply good electrical conductivity, but also has low density and light weight.
3.In addition, aluminum resources are much richer, and the price is much cheaper. Therefore, aluminum as conductor have so many advantages, and aluminum is used as a conductive material for high-voltage power transmission.