Abstract: The invention relates to a method and to a system (1) for monitoring at least one inductive operating means (TR). The inductive operating means (TR) is used in a power supply network. For this purpose, each inductive operating means is assigned a monitoring unit (2). Real-time data (22) relating to the current state of the inductive operating means (TR) can be stored in a data store (4) of the monitoring unit (2). An evaluation unit (6) of the monitoring unit (2) is communicatively connected to the data store (4). By means of the monitoring unit (2), a failure rate (FR) for the at least one inductive operating means (TR) is determined according to a state factor (CF).

Abstract: Transformers are in a parallel circuit in which a tap changer with a control sensor is associated with each of the transformers and all control sensors are connected together by a communications connection. Each control sensor generates a measurement that is transferred by the communications connection. A measurement is generated with each of the control sensors, and at least one of the measurements of the control sensors of the transformers by the communications connection is transferred to N?1 control sensors. Then a controlling deviation caused by a circuit reactive current is calculated for each control sensor on the basis of the measurements of the control sensors. Finally the tap changer associated with each transformer is actuated by the respective control sensor as a function of the calculated controlling deviation such that minimization of the circuit reactive current is carried out for the respective transformer.

Abstract: A method for controlling the parallel running of a plurality of transformers T1, T2, . . . , TN) in a parallel circuit (10) is disclosed, wherein each of the transformers (T1, T2, . . . , TN) is assigned a measuring/control device (12) and all the measuring/control devices (12) are connected to one another via a communication connection (16). In the absence of a standby signal of at least one measuring/control device (12), interruption (16) of the communication (14) is displayed. The measured values determined at the time (t) of the interruption remain constant for the duration of the interruption (16) and are also included in the calculation of the control errors during the interruption (16), in order to minimise a circuit reactive current of the transformers (T1, T2, . . . , TN).