A Service Life Prediction Method of Stranded Carbon Fiber Composite Core Conductor for Overhead Transmission Lines.

Area of Science:

• Materials Science
• Chemical Engineering
• Polymer Science

Background:

• Stranded carbon fiber composite cores are vital components in conductors.
• Understanding their thermal degradation is crucial for predicting service life.
• Temperature significantly impacts material performance and longevity.

Purpose of the Study:

• To investigate the effect of temperature on the service life of stranded carbon fiber composite cores.
• To develop a life prediction model based on thermal decomposition kinetics.
• To establish a reliable method for assessing conductor durability under various thermal conditions.

Main Methods:

• Utilized thermogravimetric analysis (TGA) to study thermal decomposition.
• Calculated activation energy (E) using Flynn-Wall-Ozawa, Kissinger, and Coast-Redfern methods.
• Developed a life prediction model using kinetic equations derived from experimental data.

Main Results:

• Activation energy values were consistent across different calculation methods (160.35–168.76 kJ/mol).
• A kinetic equation for thermal decomposition was established, incorporating a reaction mechanism function and rate parameter.
• The service life prediction model was validated using a 5% mass loss criterion.

Conclusions:

• The thermochemical reactions of carbon fiber composite cores are predictable and effective.
• The developed life prediction model accurately estimates service life based on operating temperature.
• This research provides critical insights for ensuring the long-term reliability of composite core conductors.