CATHODE STATION CONTROL APPARATUS Russian patent published in 1995 - IPC

FIELD: electrotechnical blocking out corrosion of metal structures. SUBSTANCE: input of power source 1 is connected to alternative current circuit and output - to synchronizer 2. Synchronizer 2, oscillator 3 and shifting unit 4 are connected to each other in series. There is magnetic differential member 5 with five windings - - 10. In the case, measuring winding 6 is connected between pipeline 11 and grounder 12. Read out winding 7 is connected between first output of shifting unit 4 and positive bar of power source. Shifting winding 8 is connected between second output of shifting unit 4 and positive bar of power source. Output windings 9 and 10 are connected to thyristors of cathode station. Cathode station has transformer and semi-controlled bridge-type rectifier. Taking into consideration low input resistance of pipeline-grounder circuit in measuring winding 6 circuit, filter 31 with big resistance for alternating component of signal at input of differential magnetic member 5 is set. Simultaneously filter fulfil functions of control signal pulsing reduction. EFFECT: electrotechnical blocking out corrosion of metal structures is used cathode protection of main pipelines from overtension. 2 dwg