讨论了碳纤维复合芯使用环境中所受到的紫外线、酸性介质、水等环境因素对其性能的影响,表明碳纤维复合芯受环境影响较为严重,导致其表观颜色发生改变、纤维裸露、力学及耐热性能下降.通过在其表面涂覆一种防护涂层,能够有效地提高碳纤维复合芯的耐候性能,使其在架空导线中发挥更加安全可靠的承载作用.

Four kinds of ethylene-tetrafluoroethylene copolymer(X-ETFE) insulating materials were prepared by irradiation crosslinking using existing technology,and their mechanical properties,dielectric property,melt index and heat-resistance were analyzed.The results show that the prepared X-ETFE insulating materials can meet the requirements of insulating properties in GJB 773A—2000.

　　通过对碳纤维复合芯及其导线的研究和试验，解决关键技术和难点。在大量研究和工程实际应用的基础上，制定该产品系列国家标准，统一碳纤维复合芯及其导线的设计、制造和试验方法。并在此基础上形成国际IEC标准草案。不仅解决了复合芯及其导线产品无国家标准的现状，同时也是我国在架空输电线领域首次自主制定国际标准。

Four types of X-ETFE insulated materials were processed into aircraft wires,and the wires were treated by irradiation crosslinking.The processability,mechanical properties and crosslinking-proof-test of the wires were studied.The results showed that the performances of aircraft wires met the requirements of the standards MIL-W-22759 and GJB 773A—2000.

In this paper,the substitution of the traditional strength member in overhead conductors—steel wire core by the mixed fiber reinforced composite material in order to improve the ampacity,mechanical property and safety factor of the conductor is presented.The preparation of the mixed fiber strength member consisting of basalt fiber,carbon fiber etc is briefly introduced.The influence of the processing conditions on the mechanical,thermal ageing and heat expansion performance of the mixed fiber strength member was investigated.The result showed that with the fiber content in the mixed fiber strength member(short as mixed member) increased or the pultrusion speed decreased the bending strength and modulus of the mixed member is increased;that a short time thermal ageing will not lower the mechanical property of the mixed member dramatically while further raising the cure degree of the mixed member.The mixed member has a small thermal expansion coefficient,only 1 /4 of that of the steel core,resulting in great reduction in occurrences of heat sag in overhead conductors.