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Pat. 9899831 United States, Int. Cl.22 H02H 9/04, H02H 7/12, H02M 1/32, H02M 3/337, H02M 5/458, H02M 1/00. Method and device to protect an ESP power supply from transient over-voltages on the power grid : Appl. N 13/878291 : Filed 30.09.2011 : Pub. 20.02.2018 : / Per Ranstad, Jorgen Linner ; Assignee General Electric Technology Gmbh ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9899831/en?oq=US9899831.html (дата обращения: ДД.ММ.ГГГГ).