The heat resistant overhead conductors are widely used,as the main renewal conductor type for renovation and capacity expansion of urban networks,in the renovation of regional grids.

The paper analyzes the principles of the heat-resisting wire electric transmission technology,the heat-resisting mechanisms and the characteristics of the heat-resisting wire,and studies deeply the impact for the circuit after the temperature-rising.

This paper introduces the current project situation and the technological development level of the big sectional wire and the heat-resisting wire electric transmission technology in China.

To adopt heat-resisting wire to raise the transmission capacity was the one of new technical project for Beijing Electric Power Corp.

Manufacture of the overhead conductors for 500 kV transmission line;

The paper analyzed the reason of twisting for overhead conductor and the relations between conductor wave and rigidity, put forward the test method of twisting moment based on the needs of project and investigation of foreign condition, and discussed the R&D of the special equipment for twisting moment test, still put forward the specific me.

The galloping tester developed by Shanghai Eectric Cable Research Institute can imitate well the real galloping tracks of the installed overhead conductors in.

This paper started with the composing and calculation of overhead transmission line the annualized fees, then the wire economical current density formulaJ_∞was derived.

Automatic test technique of overhead electrical conductors creeping;

Research and application states on friction and wear of overhead electrical conductors were presented.

A fretting test of overhead electrical conductor was performed on a conductor bending fatigue test system under the conditions of an axial load of 30 MPa,a frequency of 10 Hz and a bending amplitude of 0.