1、STDSAA SSCC-ENGL 1777 II Ob04500 0038523 h?h II Overhead Electrical Conductors A Technical Report of The Aluminum Associations Electrical Technical Committee STD-AA SSCC-ENGL 1777 M 0604500 0018528 502 eS forward In 1961, the Electrical Technical Committee of The Aluminum Association initiated a stu
2、dy of the Stress-Strain Curves for bare stranded aluminum conductor and ACSR (Aluminum Conductor, Steel Reinforced) in use by members of the Association manu- facturing these products. The purpose of the study was to determine what, if any, differ- ences existed between curves for the same types of
3、conductors. Results of this study revealed that the curves in use by the various companies dif- fered to only a minor degree. In fact, the differences in most instances were no greater than the experimental error that might occur during the tests upon which the curves are based. It was thus found po
4、ssible to adopt Typical Stress-Strain Curves for the various standard types of conductors now being produced for computing sags and tensions to be used in installing these conductors. In 1964, it was decided that this study should be extended to incorporate data on Creep - the permanent elongation o
5、f the conductors that can be expected with time under sustained stress after the conductors have been placed in service. Again, the study showed that the effect of creep data used by various conductor manufacturers for standard conductors differed by only a minor degree. It was thus found that avera
6、ge creep data could be used. These curves are proposed and presented for sag-tension calculations only. Stress- Strain Curves are not a useful parameter for product acceptance. The study has been completed for the following types of bare stranded conductors: ACSR (Allsteel strands) 611 3017 7, 19, 3
7、7 Il I: il li I, - 4 + f -+ STD*AA SSCC-ENGL 1997 - Ob04500 0018547 4b4 W supplement To supplement The Aluminum Association Stress-Strain-Creep Curves, the following values for temperature coefficients of expansion may be used for normal sag-tension. computations. For ACSR conductors, the temperatur
8、e coefficients of expansion listed apply only so long as the stress is borne by both the steel and aluminum strands. Conductor Aluminum Steel ACSR ACSR ACSR ACSR ACSR ACSR ACSR ACSR ACSR ACSR Stranding All All 611 711 1811 24/7 26/7 30/7 45/7 54/7 5411 9 8411 9 4350 (EC), 5005, & 6201 Temperature Co
9、efficient of Expansion In it ia IP F 12.8E-6 6.4E-6 10.2E-6 9.5E-6 11.6E-6 10.5E-6 9.9E-6 9.5E-6 11.2E-6 10.2E-6 10.4E-6 11.2E-6 FinalPF 12.8E-6 6.4E-6 10.5E-6 9.8E-6 11.7E-6 10.8E-6 10.5E-6 9.9E-6 11.5E- 10.7E-6 10.8E-6 11.5E-6 InitialPC 23.0E-6 11.5E-6 18.3E-6 17.1E-6 20.8E-6 18.9E-6 17.8E-6 17.OE
10、-6 20.2E-6 18.8E-6 18.3E-6 20.1 E-6 FinalPC 23.0E-6 11.5E-6 18.9E-6 17.7E-6 21.1 E-6 19.5E-6 18.9E-6 17.8E-6 20.7E-6 19.3E-6 19.5E-6 20.6 E-6 stress-strain - creep curves for l Aluminum Overhead l Electrical Conductors STD-AA SSCC-ENGL 1997 ? Ob04500 OOl18548 3T0 ? The Incomarated Aluminum Association 900 19th Street N A? Wrchinptpn n p 7nnnc
