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Pat. 10270250 United States, Int. Cl.22 H02J 3/00, H02J 3/36, H02M 5/45, H02M 7/19, H02M 7/483, H02M 7/757. Insulation design apparatus of high voltage direct current transmission system : Appl. N 14/793420 : Filed 07.07.2015 : Pub. 23.04.2019 : / Ho Seok Choi, Yong Kil Choi ; Assignee Lsis Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10270250/en?oq=US10270250.html (дата обращения: ДД.ММ.ГГГГ).