SYSTEM, METHOD AND COMPUTER PROGRAMME PRODUCT FOR DETECTING PHYSICAL VARIABLES OF AT LEAST ONE COMPONENT OF A TAP-CHANGING TRANSFORMER AND FOR MONITORING THE COMPONENTS OF A TAP-CHANGING TRANSFORMER

A system detects physical variables of at least one component of a tapped transformer and monitors the at least one component of the tapped transformer. The system includes a computer in communicating with a measuring instrument, which is in communicating connection with a sensor for reception of the physical variables. The computer receives the physical variables, which are collected in the measuring instrument, as a function of time of the at least one sensor; filters the physical variables as a function of time to generate filtered signals, and creates from the filtered signals a highly resolved envelope representing a signal level of the physical variables; and determines a first limit value curve and a second limit value curve, the position of which is variable in a direction of an ordinate, and the first limit value curve represents the limit value.