An Iterative Calculation on the Ampacity of Single-Core Cable and Experimental Validation

An IEC60287 based iterative method of ampacity calculation is established and used to calculate the ampacity of typical cable lines, and the results are compared with that by IEC method, resulting in a conclusion that accuracy and application scope of the two methods are not much different but the former is better, so that the correctness of the iterative method is verified theoretically.Ampacity tests of the single-core cable are done in State Grid Electric Power Research Institute to conpare the detected cable temperature with the calculated, showing that they are basically in coincidence.The iterative method can be used in precise ampacity calculation of the cables that consist of multicircuits with different structures and load currents or circulating currents, and in operation temperature calculation of the any part of the cable itself to offer a theories support to the operation cable state monitoring.