Experimental Procedure for Determining the Remanent Magnetic Flux Value Using the Nominal AC Energization

The laboratory setup and corresponding experimental procedure for determining the remanent magnetic flux in the magnetic core of a single-phase transformer are presented in this paper. Using the proposed method, the remanent flux can be determined without prior knowledge of any parameter or past states of the transformer which is a significant advantage compared to previously known methods. Furthermore, reliable information about the remanent flux could be obtained using less equipment than other methods. Only electrical measurements are needed, without any physical intervention in the core or some other parts of the transformer. However, the major drawback is that some new unknown value of the remanent flux is set after the measuring procedure. Various initial conditions of the remanent flux and the closing voltage angle are set before each energization of the transformer to provethe validity of the proposed method, which can be used to obtain some characteristics of the remanent flux, such as stability over time or its dependence on some external factors.