A low or medium voltage electric power distribution network comprising: a plurality of P&C devices (IED1, IEDN), and a computerized station (11) which can communicate with said P&C devices through a communication network (12). Said computer station comprises first computerized means (111) for executing, according to a batch processing mode, downloading/uploading sessions of configuration/software upgrading data packages (F1, FN) to/from said P&C devices, said computerized means executing a plurality of processing threads during a downloading/uploading session of said configuration/software upgrading data packages, each of said processing threads being executed for performing the task of downloading/loading one or more configuration/software upgrading data packages to a selected P&C device in parallel and independent manner with respect to the other P&C devices.