US 11,777,303 B2
Leakage current based remote monitoring device and method for disconnector devices
Gian-Luigi Madonna, Otelfingen (CH); Xavier Kornmann, Lauchringen (DE); Daniel Neeser, Thalwil (CH); Stefano Bertoli, Wettingen (CH); Ektor Sotiropoulos, Horgen (CH); Martin Schick-Pauli, Zürich (CH); Alexander Fach, Boppelsen (CH); Philipp Sommer, Zürich (CH); and Yannick Maret, Dättwil (CH)
Assigned to HITACHI ENERGY SWITZERLAND AG, Baden (CH)
Appl. No. 17/438,275
Filed by HITACHI ENERGY SWITZERLAND AG, Baden (CH)
PCT Filed Mar. 11, 2019, PCT No. PCT/EP2019/056017
§ 371(c)(1), (2) Date Sep. 10, 2021,
PCT Pub. No. WO2020/182287, PCT Pub. Date Sep. 17, 2020.
Prior Publication US 2022/0149611 A1, May 12, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H02H 3/00 (2006.01); H02H 3/16 (2006.01); G01R 31/52 (2020.01); G01R 19/25 (2006.01); H02H 1/00 (2006.01); H02H 9/00 (2006.01)
CPC H02H 3/16 (2013.01) [G01R 19/2513 (2013.01); G01R 31/52 (2020.01); H02H 1/0007 (2013.01); H02H 9/005 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A leakage current measuring device for a grid protection system protecting a power distribution or transmission grid from damage in case of a power surge,
the grid protection system including a disconnector device and a surge arrester connected in series along a grounding path, the grounding path connecting a phase of a power distribution or transmission grid through the surge arrester and the disconnector device to ground,
the disconnector device being configured for being activated in case of an overload condition, thereby disconnecting the surge arrester,
the leakage current measuring device comprising:
a leakage current sensor for measuring a leakage current IL flowing along the grounding path,
the leakage current IL being indicative of the electrical connection status of the disconnector device, the electrical connection status being one of an activated and an inactivated status of the disconnector device; and
a determining section configured to determine the electrical connection status from the leakage current IL.