Transformer6 - 13Winding ResistanceNever open the measuring circuit while current flows. Dangerous voltage mayoccur!Figure 8:Setup of a windingresistance testUse the RWinding test card to measure the resistance of a power transformer’swinding. To do so, loop the I DC current signal from CPC 100 6A DC output viaIAC/DC as shown in Figure 8 and inject it into the transformer’s winding.IAC/DC measures the injected current, and V DC input measures the voltagegenerated at the transformer’s winding. From these values the windingresistance is calculated.Alternatively, inject the current directly from the 400A DC output (see Figure 9).Note: Some test cards are available in more than one test mode. Forexample, the test card RWinding can be selected in CT, Resistanceand Transformer.This is solely related to usability. With regard to functionality, the testcard RWinding is identical in all test modes.
