Three-Phase Combinsd Transformers Test Case

Sheet1 Basic Informtion

Figure 1  Nameplate

①The three-phase combinsd transformer includs CT,PT and vacuum circuit breaker,the overall structure is as follows;

Figure 2  Three-phase combinsd transformer

Figure3 Connection Diagram

②Firstly,we perform all CT’s tests-saturation, ratio and polarity, winding resistance, all taps with the push of a button and without changing leads.

Figure 4  CT Wiring Diagram

Figure 5 On-site Display

③Wait until our test is finished,you could print test data.As shown in Figure 6:

Figure 6 CT Test Report

④Secondly,we perform PT’s ratio and polarity tests.Before the test,you should ground the tester and open the CT secondary winding and the PT secondary winding,also one end of the PT secondary side must be grounded.

Figure 7 PT Wiring Diagram

Figure 8 On-site Display

⑤Wait until our test is finished,you could print test data.As shown in Figure 9:

Figure 9 PT Test Report