High-voltage power transmission line dynamic transmission capacity measuring and calculating system

A high-voltage power transmission line dynamic transmission capacity measuring and calculating system comprises: a segment of reference lead arranged near a power transmission line, wherein the direction of the reference lead is parallel with the direction of the power transmission line; temperature sensors which are respectively provided on the reference lead and the power transmission line and wireless sending modules which are respectively connected with the temperature sensors, wherein the temperature sensors respectively measure the temperature of the reference lead and the power transmission line at a certain time interval, then the wireless sending modules respectively send out the temperature immediately; and a computer which receives data and performs calculations, so as to obtain a real-time allowed current-carrying capacity of the lead. The high-voltage power transmission line dynamic transmission capacity measuring and calculating system of the utility model can substitute the sunshine radiation quantity to calculate the allowed current-carrying capacity of the power transmission line in the case of not utilizing a sunshine radiation sensor, i.e., the measuring and calculating system utilizes a transient state heat balance formula equation set to solve a heat transfer coefficient, then utilizes a stable state heat balance formula to calculate the real-time allowed current-carrying capacity of the power transmission line on the basis of the heat transfer coefficient. The high-voltage power transmission line dynamic transmission capacity measuring and calculating system of the utility model has the advantages of simple operation and low labor intensity; in addition, the measuring and calculating system can omit the sunshine radiation sensor, thus the measuring and calculating system is beneficial to reduce cost.