Circuit component and transformer device with controllable impedance and with systems equipped with such devices

A transformer device comprising a body (1) of a magnetisable material, a primary main winding (A1) wound round the body (1) about a first axis and a control winding (A2) wound round the body (1) about a second axis, at right angles to the first axis, where the primary winding (A1) is arranged for connection to a primary working circuit in which the transformer device is to be employed, the control winding (A2) is arranged for connection to a control unit for controlling the transformer's transformation state, and a secondary main winding (A3) wound about the first or the second axis arranged for connection to a secondary working circuit.

A system for controlling the impedance of a transmission line (12),

• comprising a measuring unit (2) for measuring parameters concerning the line's operation (U, I cos φ, P, Q, S, f), a processing unit (4) with at least one input and one output, where the input is connected to the measuring unit (2), and in which processing unit the measurement values are compared with desired operating values for the line (12) in order to derive an output signal constituting a control current signal, and a circuit component (L1) with controllable impedance with a main winding (A1) for connection to the transmission line (12) and a control winding (A2) for connection to the processing unit (4), with the result that the control current signal is fed to the control winding (A2) from the processing unit (4), thereby controlling the processing unit (4) component's (L1) impedance and the line's (12) operation on the basis of the ratio between the measurement results and the desired values.

A system for earth fault compensation (FIG. 6), i.e. for regulating earth fault impedance comprising a measuring unit (2) for measuring earth fault back current together with other parameters for an electrical component (T1), a processing unit (4) with at least one input and one output, where the input is connected to the measuring unit (2) and in which processing unit the measurement values are compared with desired values for earth fault back current values in order to derive an output signal constituting a control current signal, and a circuit component (L1) with controllable impedance with a main winding (A1) for connecting between the component (T1) and earth and a control winding (A2) for connecting to the processing unit (4), with the result that the control current signal is fed to the control winding (A2) from the processing unit (4), thereby controlling the processing unit (4) component's (L1) impedance and earth fault current on the basis of the ratio between the measurement results and the desired values.

A filter system for reducing harmonic currents, phase asymmetry and flicker as well as for reactive compensation of an electrical device, where the system comprises a measuring unit (2) for measuring parameters concerning the device's operation (U, I cos φ, P, Q, S, f), a processing unit (4) with at least one input and one output, where the input is connected to the measuring unit (2), and in which processing unit the measurement values are compared with desired operating values for the component in order to derive an output signal constituting a control current signal, and a filter connected to the component, where the filter comprises a circuit component (L1) with controllable impedance with a main winding (A1) for connection to the filter circuit and a control winding (A2) for connection to the processing unit (4), with the result that the control current signal is fed to the control winding (A2) from the processing unit (4), thus controlling the processing unit (4) component's (L1) and thereby the filter's impedance and the device's operation on the basis of the ratio between the measurement results and the desired values.

A switch or current limiting system for an electrical device such as, e.g. an electric motor, where the system comprises a measuring unit (2) for measuring parameters concerning the device's operation (U, I cos φ, P, Q, S, f), a processing unit (4) with at least one input and one output, where the input is connected to the measuring unit (2), and in which processing unit the measurement values are compared with desired operating values for the component in order to derive an output signal constituting a control current signal, and a circuit component connected between the power supply and the device, where the circuit component has a controllable impedance with a main winding (A1) for connection between the power supply and the device and a control winding (A2) for connection to the processing unit (4), with the result that the control current signal is fed to the control winding (A2) from the processing unit (4), thereby controlling the processing unit (4) component's (L1) impedance and thereby the off/on position of the switch substantially steplessly and thereby the device's operation on the basis of the ratio between the measurement results and the desired values.