Owing to magnetic hysteresis and eddy current losses in the core

the AC resistance of single-layer conductor varies nonlinearly over a substantial range with the carrying current. However

the nonlinear relationship between resistance and carrying current is neglected in the conventional electro-thermal coordinated power flow model

which may cause inaccuracy in the simulation results. Therefore

an experimental platform is set up to measure the resistance values of conductor LGJ120/25 under different current and temperature conditions. Then a simplified AC resistance model taking the effects of carrying current into account is developed based on the parameter estimation method. On this basis

an electro-thermal coordinated power flow model for single-layer conductor network is proposed by regarding the line current as a state variable of the power system

and a decoupling algorithm for the model is derived. Case study results show that the model is able to provide a more accurate result of electro-thermal coordinated power flow

thus effectively avoiding overrating the allowance of line operating temperature

while reducing overload risks for transmission lines and improving system security for single-layer conductor network. This work is supported by National Natural Science Foundation of China(No. 51506092)and Fundamental Research Funds for the Central Universities(No. 30916011334).