Purchase price acsr conductor + advantages and disadvantages
The types of each cable come in different sizes and these two factors are mostly defining a number of cable properties.
acsr conductor data sheet
The term "aluminum conductor steel-reinforced cable" (ACSR) refers to a specific kind of stranded conductor that has a high capacity and a high strength and is often used in overhead power lines.
Aluminum of extremely high purity is used for the outer strands because of the material's high conductivity, low weight, low cost, resistance to corrosion, and decent mechanical stress resistance.
To provide the conductor with an extra source of strength and to better assist in supporting its weight, the center strand is made of steel.
Steel has a higher strength than aluminum, which enables a greater amount of mechanical force to be given to the conductor without causing it to break.
Steel has a lower elastic and inelastic deformation (permanent elongation) as a result of mechanical loading (for example, wind, and ice), as well as a lower coefficient of thermal expansion when it is subjected to current loading.
Steel also has a lower permanent elongation.
As a result of these qualities, ACSR conductors sag noticeably less than those made entirely of aluminum.
ACSR has been given the designation A1/S1A in accordance with the naming conventions of both the International Electrotechnical Commission (IEC) and The CSA Group (previously known as the Canadian Standards Association or CSA).
The aluminum alloy and temper that is typically used for the outer strands in the United States and Canada is known as 1350-H19, although in other parts of the world, it is known as 1370-H19.
Both of these alloys include 99.5+% aluminum by weight.
The suffix of the aluminum version indicates the temper of the metal, which in the instance of H19 is extremely hard.
The temper of the aluminum is determined by the suffix.
The steel strands that are used for the conductor core are typically galvanized or coated with another substance to avoid corrosion. This is done so that the strands will have a longer service life.
The diameters of the strands that are utilized for both the aluminum and the steel strands might vary depending on the ACSR conductor that is being used.
The tensile strength of the aluminum is still the primary factor in determining the success of ACSR cable; steel is merely used to reinforce it.
Because of this, the maximum temperature at which it may operate continuously is capped at 75 degrees Celsius (167 degrees Fahrenheit).
This is the temperature at which aluminum begins to anneal and become more malleable with continued exposure.
Aluminum-conductor steel-supported cable is a type of cable that gets its strength only from the steel and can therefore be utilized in environments with temperatures as high as 480 degrees Fahrenheit (250 degrees Celsius) (ACSS).
acsr conductor price per kg
However, zinc, 5% or 10% aluminum alloy and trace mischmetal coated steel (sometimes called by the trade-names Bezinal or Galfan) and aluminum-clad steel (sometimes called by the trade-name Alumoweld) are also available and can be used instead of galvanized steel, which is the standard steel core that is used for ACSR.
There is also the possibility of using steel with a higher strength.
The type of steel that is utilized the most frequently in the United States is denoted by the designation GA2, which stands for galvanized steel (G) with class A zinc coating thickness (A) and regular strength.
Zinc coatings of class C are greater in thickness than those of class A.
They offer increased protection against corrosion, but at the cost of decreased tensile strength.
The designation GC2 refers to a core made of galvanized steel with regular strength that has a coating thickness of Class C.
High-strength steel, extra-high-strength steel, and ultra-high-strength steel are all designations for higher strength grades of steel.
The designation GA5 would be given to an ultra-high-strength galvanized steel core that had a class A coating thickness.
The tensile strength of the conductor can be increased by using steel cores with a higher strength. This makes it possible to apply larger tensions, which in turn results in less sag.
Mischmetal coatings that consist of zinc and 5% aluminum are denoted with a "M."
In comparison to zinc on its own, these coatings offer superior protection against corrosion and greater resilience to heat.
Steel with a regular strength and Class "A" mischmetal thickness weight coating would be denoted by the designation MA2 if it were coated.
"AW" denotes aluminum-clad steel as a material designation.
The greater corrosion protection and conductivity offered by aluminum-clad steel comes at the expense of the material's decreased tensile strength.
In coastal applications, aluminum-clad steel is frequently chosen as the material of choice.
The name conventions used by IEC and CSA are not the same.
S1A steel, also known as S1 normal strength steel with a class A coating, is the type of steel that is utilized the most frequently.
In comparison to the standard strength steel that is typically used in the United States, the tensile strength of S1 steel is marginally lower.
According to the standards established by the CSA in Canada, the S2A strength grade is considered to be High Strength steel.
acsr conductor size chart
Steel of the GA2 strength grade, also known as regular strength steel, is the material that is considered to be its equivalent according to the ASTM criteria. Extra High Strength steel is the category that the CSA S3A strength rating falls within.
According to the ASTM standards, the GA3 strength grade that is referred to as High Strength is the corresponding material.
The corresponding grades of GA4 and GA5 that are used by the ASTM are not yet formally recognized by the current CSA requirements for overhead electrical conductor.
The ASTM "M" family of zinc alloy coating material is not yet formally recognized by the standards that are in place at the CSA at the present time.
The greater strength steels with the zinc alloy coating known as "M" are used to construct conductors that are used by utilities in Canada.
Conductors made with ACSR are offered in a wide variety of specified diameters, and they can have a single or multiple steel wires in the middle, in addition to a greater number of aluminum strands.
There are several types of conductors, albeit they are not very common, that have a greater number of steel strands than aluminum strands.
An ACSR conductor can be somewhat identified by the stranding it is made up of. For instance, an ACSR conductor with 72 aluminum strands and a core consisting of 7 steel strands will be referred to as a 72/7 ACSR conductor.
The most common sizes of cables are #6 AWG ("6/1," which refers to six outer aluminum conductors and one steel reinforcement conductor) and 2167 kcmil ("72/7," which refers to seventy-two outer aluminum conductors and seven steel reinforcing conductors).
Conventions regarding naming
Code words are used to designate a particular conductor version in order to assist minimize confusion that may arise as a result of the numerous possible combinations of stranding for the steel and aluminum strands.
In regions other than North America, animal names are used for the code words, however in North America, bird names are utilized.
For example, in North America, Grosbeak is a 322.3 mm2 (636 kcmil) ACSR conductor with 26/7 Aluminum/Steel stranding, while Egret has the same total aluminum size (322.3 mm2, 636 kcmil conductor), but with 30/19 Aluminum/Steel stranding. Both Grosbeak and Egret have the same total aluminum size.
In spite of the fact that the total number of aluminum strands in Grosbeak and Egret are not same, the difference in the lengths of the strands is used to compensate for the difference in the number of strands.
This ensures that the total quantity of aluminum is unaffected.
Variations in the number of steel strands lead to differences in both the weight of the steel section and the overall conductor diameter.
These variations are caused by the fact that the weight of the steel portion varies.
When dealing with multiple versions of the same amount of aluminum, the majority of utilities choose to standardize on a particular conductor version in order to minimize complications connected to varied size hardware (such as splices).
Because there are so many various sizes to choose from, utilities will frequently bypass some of the sizes in an effort to decrease their inventory.
Different electrical and mechanical properties are produced as a consequence of the numerous stranding variants.
Measurements of amplitude
In most cases, manufacturers of ACSR will supply ampacity tables based on a predetermined group of presumptions.
acsr conductorsize chart pdf
Because they start from diverse assumptions when developing their evaluations, individual utilities typically use a variety of scales (which may be a result in higher or lower amperage ratings than those the manufacturers provide).
The speed of the wind and its direction in relation to the conductor, the intensity of the sun, the emissivity of the material, the temperature of the ambient air, and the highest temperature reached by the conductor are all significant variables.
characteristics of conductivity
In three phase electrical power distribution, the conductors must be constructed to have a low electrical impedance in order to ensure that there is a small amount of power wasted during the distribution process.
The two quantities of resistance and reactance are combined to form the single quantity known as impedance.
The manufacturer tabulates the resistances of ASCR conductors for various conductor designs at DC and AC frequency assuming certain operating temperatures for each conductor design. The skin effect, the proximity effect, and hysteresis loss are the primary contributors to the variation in resistance that takes place with increasing frequency.
These phenomena have variable degrees of influence on the total resistance of the conductor depending on the geometry of the conductor, which can be characterized by the name of the conductor. The influence is greater when the frequency is AC rather than DC.
Electrical reactance of the conductor, which is mostly caused by the distance between other current carrying conductors and the conductor radius, is sometimes not tabulated when ACSR conductors are used.
This is because electrical reactance is largely owing to the fact that the conductor radius.
The reactance of the conductor makes a considerable contribution to the total current that needs to pass through the line, and as a result, the reactance of the conductor makes a contribution to the resistive losses that occur in the line.
Please refer to the articles on electric power transmission and overhead power line for further details regarding transmission line inductance and capacitance.
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