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What is the current amp of 150sqmm aluminum cable?
445 amps. For example Mulberry AAAC cable.
What is AAAC cable?
All Aluminium Alloy Conductar
How would you calculate current carrying capacity of the ACSR or AAAC conductor?
* ACSR or AAAC or anything else, it does not matter. * Conductivity depends on resistance of material and resistance depends on resistivity of material and some other factors. * Resistivity of any material is generally constant term and depends on material. resistivity of alluminium and cooper is different. * General equation for calculation of resistance is: R= SL/A where, R=resistance of material S=resistivity of material L = length of material and A = area of material and now finally I = V/R where, I = max. current which can pass at given voltage and temperature V=voltage applied R=resistance of material as calculated above remember R also depends on temperature also and varies with temperature....so for large change in temp. you will have to also consider that factor.
Why do metal alloys used in electrical wires?
Most electrical wires use unalloyed copper. The exception is high-power overhead lines that use aluminium for its low density, which means there is a lot less mass for the towers to support, so they are lighter and less expensive. Aluminium overhead cables are either ACSR - aluminium core, steel reinforced, which uses multi-strand cables with steel strands in the centre; or AAAC which is all-aluminimum alloy conductor. AAAC cables use an aluminium-magnesium-silicon alloy with silicon 0.5-0.9%, magnesium 0.6-0.9%, iron 0.5% max, copper 0.1%, manganese 0.03%, chromium 0.03%, zinc 0.1%, boron 0.06%. The purpose of adding other elements is to increase the tensile strength of the conductors so they can be tensioned up without too much dangling.
What is the thickness of high voltage line and What is the relation between voltage and thickness of conductor?
Stranded cables of up to 1.4 inch diameter are available from manufacturers for high-voltage overhead power distriution.There are two main types of cable, ACSR (aluminium core, steel-reinforced) and AAAC (all-aluminium alloy conductor). Both types are stranded, and the ACSR type uses steel for the inner layers of strands.Two popular types used for grid distribution in the UK are Lynx, with 185 mm2 cross-section area of aluminium, capable of 562 amps in the winter, and UPAS with 362 mm2 AAAC that can carry up to 776 amps in the winter .There is no real relationship between conductor thickness and voltage, but in general single conductors are used up to 132 kV, then twin conductors are used at 275 kV and quad at the UK maximum 400 kV. That is four parallel wires closely spaced with X-shaped spacers.A supergrid circuit using quad UPAS conductors at 400 kV can carry 2150 MVA. A normal line of pylons supporting a pair of circuits can carry 4300 MVA. These aluminium cables would have a total mass of 24 tons per kilometre.Additional AnswerFurther to the excellent first answer provided by 'Historikeren', it's worth pointing out that twin- and quadruple-bundled conductors are used to relieve the electrical stress on the conductors at higher voltages. By 'stress', we mean the intensity, or flux density, of the electric field emanating radially from the conductors' surface.If a single conductor's diameter is too small for a particular voltage level, then the resulting electric flux density at the conductor's surface can break down the insulating properties of air. Because of this problem, it's sometimes necessary to select a conductor whose diameter is larger than is actually necessary to carry the load current, simply in order to reduce the electric flux density at its surface. So, in this sense, there is a relationship between conductor diameter and voltage levels.The alternative is to use bundled conductors. By using 'bundled' conductors, the electric flux is distributed across the surfaces of all the bundled conductors (in other words, the bundled conductors behave like one, large-diameter, conductor) -thus reducing the flux density at the surface of individual conductor.It's excessive electrical stress that causes the breakdown of insulation of the surrounding air: i.e. ionisation, the 'buzzing' one hears during damp conditions, and the blue discharge that is sometime visible at night. This all contributes to line losses.
Why do you use burette to measure liquid during titration?
Any (variable) amount of liquid can be measured by weight (mass balance) or by volume.A titration is mostly carried out as volumetric analysis method.An INVariable amount is measured by a (volumetric, standardized) pipet and for Variable volumes a calibrated buret is used to reach high precision standards of AAAC.
Size of conductor used for 132kv line?
The so-called SIL (surge impedance loading) of a transmission line is given by P = U2 : Z, where P is the power tansmitted, in MW, U is the line voltage in kV, and and Z is the surge impedance of the line, in ohm. For a 132 kV overhead transmission line, it is typically 400 ohm. The SIL is the power trasnmitted that causes the minimum of losses, that is, it is the most economical condition to operate the line. For example. P = 1322 / 400 = 43.56 MW =43,560 kW The current per phase is I = P / 1.732 U = 43,560 / (1.732 x 132) = 190.5 A If the cable is ACSR (aluminum cable, steel reinforced), it can carry about 1 A/mm2 So a conductor of about 200 mm2 cross section would be a good choice. This calculation just gives a rough idea of the size of the conductor, since the best result is given after several other factors are taken into account, e.g., length of the line, cost of energy loss, cost of cable, cost of steel structures, standardized cable sizes available, etc.
