Novel 3-Phase Self-Limiting Transformer With Magnetic Flux Applied by Perfect Closed YBCO Wire Loops

With this solution we wanted to examine whether it is possible to create a 3-phase self-limiting transformer applying a new method never used before in the way we do. Therefore we made a new, working model for testing. The primary and secondary coils are on two independent iron cores in all the three phases. We created the coupling between the primary and secondary coils using perfect closed YBCO loops with parallel turns. The advantage of this solution is that the transformer is able to break the coupling so there is no current in the secondary coil in an ideal case. We tested the results in the case of the 1-, 2- and 3-phase fault current. The paper presents the results of our experiments and introduces new, advanced applications of the flux transformer. We considered the efficiency and significance of the perfect closed loop made from YBCO wire. The first work has made by us as possibility of application of the principle of the magnetic flux constancy in the closed loop in this field.