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Pat. 10014791 United States, Int. Cl.22 H01F 27/28, H01F 17/00, H01F 17/04, H01F 27/24, H01F 27/38, H01F 27/40, H01F 27/42, H01F 38/14, H02M 5/458, H02M 7/04, H01F 29/14, H02M 1/12, H02M 7/487. Distribution transformer : Appl. N 14/423523 : Filed 23.08.2013 : Pub. 03.07.2018 : / Sandeep Bala ; Assignee Abb Schweiz Ag ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10014791/en?oq=US10014791.html (дата обращения: ДД.ММ.ГГГГ).