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Pat. 10468881 United States, Int. Cl.22 H02J 3/01, H02J 3/38, H02M 1/12, H02M 5/12, H02M 5/44. Electrical power systems having zig-zag transformers : Appl. N 15/609458 : Filed 31.05.2017 : Pub. 05.11.2019 : / Robert Gregory Wagoner, David Smith, Govardhan Ganireddy ; Assignee General Electric Co ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10468881/en?oq=US10468881.html (дата обращения: ДД.ММ.ГГГГ).