GAS-INSULATED HIGH-VOLTAGE CURRENT TRANSFORMER Russian patent published in 1998 - IPC

FIELD: electrical engineering. SUBSTANCE: transformer has support insulator 1 that mounts metal case 2 with cylinder 3 in its central part accommodating primary conductor 4 with two external terminal leads 5 and 6. Case 2 houses annular secondary windings 7 secured therein by means of insulating members 8. Cylinder 3 is connected on side A with case 2 and on side B it is insulated from case and provided with external terminal lead 9; primary conductor 4 is electrically connected to case 2 on insulated side B of cylinder 3. When transformer is operating at high transformation ratio, connections are made to terminals 5 and 6; in the process, current flows only over conductor 4 and cylinder 3 functions as electrostatic screen. In order to obtain lower transformation ratio, connections are made to terminals 5 and 9. In the process, current flows from terminal 5 through conductor 4, case 2, cylinder 3, and terminal 9, that is, it twice crosses opening of secondary windings. EFFECT: facilitated change- over from one to other of two transformation ratios on primary side, simplified design and improved economic efficiency of transformer, improved reliability. 1 dwg