Overhead Transmission lines:
Materials commonly used in conductors are aluminum,copper and steel. Galvanized steel wires are combined with aluminum in the most common type of overhead conductor-Aluminum Conductor Steel Reinforced (ACSR). The use of copper is uncommon in modern transmission lines since it weighs and usually costs considerably more than aluminum conductor of the same resistance."Standard" bare overhead conductors consist of round strands helically laid about a core in one or more layers.
In a homogeneous conductor - all aluminum conductor (AAC), hard drawn copper conductor (CU), or all aluminum alloy conductors (AAAC5005 or AAAC6201) - the core consists of a single strand identical to the outer strands. Since all the strands are the same diameter, one can show that the innermost layer always consists of 6 strands, the second layer of 12 strands, etc., making conductors having 1, 7, 19, 37, 61, 91, or 128 strands.
In a non-homogeneous conductor - aluminum conductor steel reinforced (ACSR), aluminum conductor aluminoweld steel reinforced (ACSR/AW), or hard drawn copper conductor copper weld steel reinforced (CU/CW), or aluminum conductor aluminum alloy reinforced - the strands in the core may or may not be of the same diameter. In a 30/7 ACSR conductor the aluminum and steel strands are of the same diameter. In a 30/19 ACSR they are not. Within the core or within the outer layers, however, the number of strands always increases by 6 in each succeeding layer. Thus, in 26/7 ACSR, the number of layers in the inner layer of aluminum is 10 and in the outer layer 16.
The most common type of transmission conductor is ACSR. ACSR consists of one or more layers of aluminum strands surrounding a core of 1, 7, 19, or 37 galvanized steel strands. ACSR is manufactured in a wide range of sizes and strandings ranging from #6 AWG 6/1 (OD = 0.198 inches [5.1 mm]) to 2156 kcmil, 84/19 “Bluebird” (OD = 1.762 inches [45.5 mm]). Certain strandings are stronger than others.36/1 ACSR is the weakest stranding (1/37 of the crossectional area is steel). 30/7 is the strongest (7/37 of the crossection is steel). The following tables group strandings of ACSR by strength according to a "Type No." classification where the Type No. is the percentage ratio of steel to aluminum crossectional areas.
Materials commonly used in conductors are aluminum,copper and steel. Galvanized steel wires are combined with aluminum in the most common type of overhead conductor-Aluminum Conductor Steel Reinforced (ACSR). The use of copper is uncommon in modern transmission lines since it weighs and usually costs considerably more than aluminum conductor of the same resistance."Standard" bare overhead conductors consist of round strands helically laid about a core in one or more layers.
In a homogeneous conductor - all aluminum conductor (AAC), hard drawn copper conductor (CU), or all aluminum alloy conductors (AAAC5005 or AAAC6201) - the core consists of a single strand identical to the outer strands. Since all the strands are the same diameter, one can show that the innermost layer always consists of 6 strands, the second layer of 12 strands, etc., making conductors having 1, 7, 19, 37, 61, 91, or 128 strands.
In a non-homogeneous conductor - aluminum conductor steel reinforced (ACSR), aluminum conductor aluminoweld steel reinforced (ACSR/AW), or hard drawn copper conductor copper weld steel reinforced (CU/CW), or aluminum conductor aluminum alloy reinforced - the strands in the core may or may not be of the same diameter. In a 30/7 ACSR conductor the aluminum and steel strands are of the same diameter. In a 30/19 ACSR they are not. Within the core or within the outer layers, however, the number of strands always increases by 6 in each succeeding layer. Thus, in 26/7 ACSR, the number of layers in the inner layer of aluminum is 10 and in the outer layer 16.
The most common type of transmission conductor is ACSR. ACSR consists of one or more layers of aluminum strands surrounding a core of 1, 7, 19, or 37 galvanized steel strands. ACSR is manufactured in a wide range of sizes and strandings ranging from #6 AWG 6/1 (OD = 0.198 inches [5.1 mm]) to 2156 kcmil, 84/19 “Bluebird” (OD = 1.762 inches [45.5 mm]). Certain strandings are stronger than others.36/1 ACSR is the weakest stranding (1/37 of the crossectional area is steel). 30/7 is the strongest (7/37 of the crossection is steel). The following tables group strandings of ACSR by strength according to a "Type No." classification where the Type No. is the percentage ratio of steel to aluminum crossectional areas.
Overhead Transmission lines
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Oleh
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