G - Physics – 01 – K
Patent
G - Physics
01
K
73/72
G01K 7/16 (2006.01) G01K 7/00 (2006.01) G01R 31/06 (2006.01)
Patent
CA 1191719
Abstract A method and apparatus for determining by measurement the temperature rise in an energized a.c. winding of a transformer using the principle of measuring resistance change is described. A first measurement of the resistance of the a.c. winding is taken with the a.c. winding unenergized at a datum temperature The corresponding electrical output signal is used to calibrate the apparatus, such that at any increased temperature the ratio of the resistance when hot (RH) of the resistance of the winding when cold (RC) is calculated and displayed on a ratiometer. This is achieved by utilising a particular circuit arrangement in which the component values are selected such that the d.c. signal extracted from the energized a.c. winding is directly related to the resistance of that winding only. The resistance measurement is substantially independent of the effect of the resistance of the connecting leads of the measuring circuit. A permanent recording of the resistance change of the winding under test can be obtained. The ratio of the resistances can be modified using a well known formula such that a direct windings temperature or temperature change in degree Celsius can be displayed. The apparatus and circuitry of the present invention can be used to measure the temperature changes in an a.c. winding of a motor.
417513
Canadian Standards Association
Hirons & Rogers
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