With the rapid development of urban power grid

the long-distance and large-capacity ultra-high voltage cross-linked polyethylene（XLPE）cables have been widely used. AC withstand voltage test is a routine and necessary item in the handover and preventive test of crosslinked polyethylene cable. Aiming at the field test requirements of 500 kV AC XLPE cable in a cable line project

the typical series resonant test reactors are selected as the research objects and the electric-thermal-current coupling simulation calculation under full load is carried out to verify whether the design of the reactor can meet the field test requirements. The simulation results show that the highest hot spot temperature of test reactor

namely 63.83 ℃

appears in the inner layer of the first line cake of the winding. The average oil flow temperature is 55.7 ℃

the oil temperature on the top layer is 61.5 ℃ and the average temperature of the winding is 60.18 ℃. The comprehensive analysis of the temperature rise limit and the simulation results can judge that the temperature and oil flow velocity distribution obtained in the simulation study are more reasonable and the temperature of each part of the reactors is within a reasonable range under full load operation conditions. Finally

as for above simulation results

some suggestions for optimum design of series resonant reactor are proposed.