US 11,705,274 B2
Arrangement for overvoltage protection of subsea electrical apparatus
Heinz Lendenmann, Västerås (SE); Kim Missing, Vaasa (FI); Esa Virtanen, Vaasa (FI); and Thomas Wagner, Mägenwil (CH)
Assigned to ABB Schweiz AG, Baden (CH)
Filed by ABB Schweiz AG, Baden (CH)
Filed on Jun. 24, 2021, as Appl. No. 17/356,669.
Claims priority of application No. 20183053 (EP), filed on Jun. 30, 2020.
Prior Publication US 2021/0407730 A1, Dec. 30, 2021
Int. Cl. H01F 27/34 (2006.01); H02B 11/26 (2006.01); H02H 9/00 (2006.01); H02H 9/08 (2006.01)
CPC H01F 27/343 (2013.01) [H01F 27/34 (2013.01); H02B 11/26 (2013.01); H02H 9/005 (2013.01); H02H 9/08 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An arrangement for an overvoltage protection of a subsea electrical apparatus, the arrangement comprising:
a tank submersible below a water surface level,
an electrical apparatus accommodated in the tank,
a surge arrester arrangement accommodated in the tank and coupled to a power supply of the electrical apparatus in the tank for providing the overvoltage protection of the electrical apparatus, and
a controllable grounding switch for connecting the surge arrester arrangement to a ground point in response to a control of the grounding switch to a closed state and for disconnecting the surge arrester arrangement from the ground point in response to a control of the grounding switch to an open state,
wherein the arrangement comprises a control unit external to the tank and configured to control the state of the grounding switch remotely.