Sensitivity Analysis of Cable Conductor Temperature Calculation to the Environment

Calculation of temperature field of power cables is meaningful to make full use of cables´ transmission capacity and improve its economy under the condition of ensuring the reliability and service life of cables. IEC 60287 standard has given a formula of cables´ core conductor temperature and ampacity based on temperature field analysis. A fast solution to conductor temperature according to the temperature of cables´ surrounding environment was given. However, this formula bases on an ideal assumption that the thermal properties of environment is uniform and stable, which is different from actual conditions. To analysis the error produced by this assumption, this paper introduces the method of sensitivity analysis. Based on thermal circuit method, this paper deduces the proposed formula theoretically. To study the error produced by the instability of environment, sensitivity analysis on environment of the formula was carried out. Finally, the scale of this kind of error under different environment was compared by test.