Maintenance and failure may occur for the power cable in the operation

and it is necessary to transfer the load to other cables urgently which results in a short-time overload of these cables. However

the relationship between the allowable overload current limit and the allowable overload current duration is short of corresponding algorithm and the mature standard

which makes no reliable basis for the emergency transfer load. In this paper

the calculation principle of the short-time overload current limit and its duration based on the two kinds of tran-sient thermal models of the IEC 60853 model and the thermal constant model is studied

and as an example

the analysis and comparison of the YJLW02 64/110 k V single core high voltage cable is carried out. The results show that the relationship curves between the current limit and the current duration of the two models are similar

but the IEC 60853 model is more close to the actual situation. The calculation method can provide reference and guidance for the decision making of short-time load transfer.