The resistivity of graphite is larger than that of both copper and aluminum. The electrical resistance of graphite is (8～13)×10-6(Ω/m). The electrical resistance of copper is 1.7×10-8(Ω/m). The electrical resistance of aluminum is 2.9×10-8(Ω/m). Therefore, when passing through the same current, the power loss of graphite is larger than that of copper and aluminum. There will be serious heating in graphite transmission. This will cause the electrical conductivity of graphite to be unstable.

The oxidation resistance of graphite is poor at room temperature. With the increase of temperature, the oxidation rate increases gradually. Graphite is consumed in the application process (taking graphite electrode as an example). The temperature of wires and cables will rise gradually when they are electrified. The increase of temperature promotes the oxidation of graphite and affects the stability of wires and cables. When the transmission system is short-circuited or struck by lightning, the graphite temperature increases and the graphite oxidation intensifies. This has a great influence on the conductivity of graphite, and will also affect the stability of the power system.  

The graphite used in the electrical industry has high requirements for particle size level and grade, and more equipment and technology need to be invested in the purification of graphite. To sum up, the conductivity of graphite in wire and cable is obviously not as good as that of copper and aluminum.

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