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Pat. 10056846 United States, Int. Cl.22 H02M 5/44, H02J 3/36, G06F 17/50, H02J 3/00. Apparatus and method for insulation design of high voltage direct current transmission system : Appl. N 14/696021 : Filed 24.04.2015 : Pub. 21.08.2018 : / Yong Kil Choi ; Assignee Lsis Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10056846/en?oq=US10056846.html (дата обращения: ДД.ММ.ГГГГ).