Grackle

Description

Description

Standards

  • Product
    ABNT NBR 7270/88

The use of Aluminium as a material for electrical conductors has greatly developed mainly due to its electrical properties. However, Aluminium conductors for most of transmission lines which spans are quite long, it is necessary an additional mechanical support. Commonly it is used galvanized steel wires for cores of ACSR.

 

APPLICATIONS

Widely used as bare cable for overhead transmission lines and also as primary and secondary bare cable for distribution lines.

 

CONSTRUCTION

ACSR is concentrically stranded conductor with one or more layers of Aluminium wire hard-drawn 1350-H19 on the galvanized steel wire core. The core may be single wire or stranded depending on the size. Steel wire is available in Class A or B galvanization as corrosion protection.

ACSR is according to electrical and mechanical strength requirements of transmission or distribution lines, can provides an appropriate design combining the quantity of Aluminium and galvanized steel wires.

 

Conditions for Ampacity calculation

Conductor temperature = 75 °C;

Room temperature = 25 °C;

Wind speed = 1 m/sec, sunny.

Characteristics

Characteristics

Construction characteristics

Construction characteristics

Type of cable
Grackle
Type of conductor
Circular, stranded
Conductor material
aluminum / Steel Core
Conductor flexibility
-
Conductor shape
Circular non compacted

Dimensional characteristics

Dimensional characteristics

Conductor cross-section
1192.5 kcmil
Aluminium cross-section
602.79 mm²
Conductor cross-section
679.68 mm²
Number of aluminium wires
54
Diameter of aluminium wires
3.77 mm
Number of steel wires
19
Diameter of steel wires
2.27 mm
Diameter of steel core
11.35 mm
Conductor diameter
33.97 mm
Average geometric radius
0.01376 m
Aluminium content
1678.2 kg/km
Steel content
601.8 kg/km
Approximate weight
2280 kg/km
Nominal outer diameter
33.97 mm
Number of cores
1
Number of round wires
-

Electrical characteristics

Electrical characteristics

Max. DC resistance of the conductor at 20°C
0.0483 Ohm/km
Max. electric resisrance AC 60Hz 75°C
0.056 Ohm/km
Inductive reactance
0.3232 Ohm/km
Capacitive reactance
0.1945 MOhm.km
Ampacity
1140.0 A

Mechanical characteristics

Mechanical characteristics

Rated breaking load (Class A)
19007 kgf
Rated breaking load (Class B)
18497 kgf
Hardness type
1350-H19

Usage characteristics

Usage characteristics

Length
1670 m
Reel net weight
3800 kg
Packaging
Reel 210/100

Resources

Resources

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