Outline of Low-Sag Aluminum Conductor Carbon Fiber Reinforced

Summary

With its special carbon fiber core, ACFR conductors achieve both lighter weight and less liner expansion than a conventional ACSR, and display the following excellent characteristics:
･ Securing the greatest clearance between conductor and ground level
･ Increasing power transmission capacity and reducing conductor sag（ACSR⇒TACFR）

Advantages of Carbon Fiber

Carbon Fiber (CFCC: Carbon Fiber Composite Cable) used for the core of ACFR has the following characteristics (refer to Fig. 1): ･ Weight is approximately 1/5 compared with steel stranded wire ･ Thermal expansion coefficient is approximately 1/12 compared with steel stranded wire ･ Tensile strength is the same grade as steel strand wire

Fig. 1 Production process of CFCC

Characteristics and Construction Menu

There are two types of conductors with the CFCC core: ACFR, the normal CFCC core combined with hard drawn aluminum wires; and TACFR, a thermal-resistant type CFCC core combination with thermal-resistant aluminum alloy wires (refer to Fig. 2, Comparison Table). ･ Weight is approximately 70 percent compared with ACSR ･ Thermal expansion coefficient is approximately 1/12 compared with ACSR (Above transition temperature)

Fig. 2 External appearance of (T)ACFR160mm2

Characteristics of Sag and Temperature

The sag of ACFR at its continuous allowable temperature of 90℃ can be decreased approximately 2 meters compared with ACSR, and the sag of (T)ACFR at its continuous allowable temperature of 150℃ can be decreased approximately 2.8 meters compared with (T)ACSR, when strung over a span length of 300 meters.

Fig. 3 Sag/temperature characteristics of (T)ACFR 160mm2

Table 1 Comparison of (T)ACFR160mm² and (T)ACSR160mm² conductor characteristics

Note: The numerical value inside the parentheses ( ) shows the electric resistance and continuous allowable electric current values for TACFR and TACSR

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