The paper presents the procedure for parameterizing a numerical relay device type 7SJ8x from Siemens using the DIGSI 5 software package on the example of protecting a cable line in a distribution network that is grounded via a small active resistor. The paper presents the selection of current and voltage transformers for connecting the relay device, the calculation of the settings of relevant protection functions (low-adjustable and high-adjustable overcurrent protection against phase-to-phase short circuits, sensitive directional homopolar overcurrent protection, thermal protection, etc.), and the configuration of the relay device (opening a project, adding a relay device, defining the settings of protection functions, etc.).