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

Abstract

The invention relates to a circuit component (L 1 ) with controllable impedance, comprising a body ( 1 ) of a magnetisable material, a main winding (A 1 ) wound round the body ( 1 ) about a first axis and a control winding (A 2 ) wound round the body ( 1 ) about a second axis, at right angles to the first axis, where the main winding (A 1 ) is arranged for connection to a working circuit in which the circuit component (L 1 ) is to be employed and the control winding (A 2 ) is arranged for connection to a control unit for controlling the impedance in the working circuit. The invention also relates to various current and voltage regulating devices comprising the circuit component or a similar transformer device.

1 - 9 . (canceled)  
   
   
       10 . A system for controlling the impedance of a transmission line, comprising a measuring unit for measuring parameters concerning the line's operation a processing unit with at least one input and one output, where the input is connected to the measuring unit, and in which processing unit the measurement values are compared with desired operating values for the line in order to derive an output signal constituting a control current signal, and a circuit component with controllable impedance with a main winding for connection to the transmission line and a control winding for connection to the processing unit, with the result that the control current signal is fed to the control winding from the processing unit, thereby controlling the processing unit component's impedance and the line's operation on the basis of the ratio between the measurement results and the desired values.  
   
   
       11 . A system according to  claim 10 , where the desired values for the line are input manually by an operator.  
   
   
       12 . A system according to  claim 10 , where the main winding is arranged for connection in series with the transmission line and the system further comprises a capacitor or a capacitor battery connected in parallel with the circuit component's main winding for series compensation of the transmission line.  
   
   
       13 . A system according to  claim 10 , where the main winding is arranged for connection in parallel with the transmission line and the system further comprises a capacitor or a capacitor battery connected in series with the circuit component's main winding for shunt compensation of the transmission line.  
   
   
       14 . A system for earth fault compensation, i.e. for regulating earth fault impedance comprising a measuring unit for measuring earth fault back current together with other parameters for an electrical component, a processing unit with at least one input and one output, where the input is connected to the measuring unit 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 with controllable impedance with a main winding for connecting between the component and earth and a control winding for connecting to the processing unit, with the result that the control current signal is fed to the control winding from the processing unit, thereby controlling the processing unit component's impedance and earth fault current on the basis of the ratio between the measurement results and the desired values.  
   
   
       15 . 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 for measuring parameters-concerning the device's operation, a processing unit with at least one input and one output, where the input is connected to the measuring unit, 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 with controllable impedance with a main winding for connection to the filter circuit and a control winding for connection to the processing unit, with the result that the control current signal is fed to the control winding from the processing unit, thus controlling the processing unit component's 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.  
   
   
       16 . A switch or current limiting system for an electrical device such as, e.g. an electric motor, where the system comprises a measuring unit for measuring parameters concerning the device's operation, a processing unit with at least one input and one output, where the input is connected to the measuring unit, 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 for connection between the power supply and the device and a control winding for connection to the processing unit, with the result that the control current signal is fed to the control winding from the processing unit, thereby controlling the processing unit component's 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.  
   
   
       17 . A system according to  claim 11 , where the main winding is arranged for connection in series with the transmission line and the system further comprises a capacitor or a capacitor battery connected in parallel with the circuit component's main winding for series compensation of the transmission line  
   
   
       18 . A system according to  claim 11 , where the main winding is arranged for connection in parallel with the transmission line and the system further comprises a capacitor or a capacitor battery connected in series with the circuit component's main winding for shunt compensation of the transmission line.