US 12,474,389 B2
Local partial discharge monitoring
Douglas B. Gundel, Cedar Park, TX (US); Uri Bar-Ziv, Zichron Yaakov (IL); and Eyal Doron, Caesarea (IL)
Assigned to 3M Innovative Properties Company, St. Paul, MN (US); and Connected Intelligence Systems Ltd., Netanya (IL)
Appl. No. 17/757,629
Filed by 3M Innovative Properties Company, St. Paul, MN (US); and Connected Intelligence Systems Ltd., Netanya (IL)
PCT Filed Dec. 31, 2020, PCT No. PCT/US2020/067687
§ 371(c)(1), (2) Date Jun. 17, 2022,
PCT Pub. No. WO2021/138573, PCT Pub. Date Jul. 8, 2021.
Claims priority of provisional application 62/955,500, filed on Dec. 31, 2019.
Prior Publication US 2023/0020865 A1, Jan. 19, 2023
Int. Cl. G01R 31/12 (2020.01); G01R 15/16 (2006.01); G01R 19/25 (2006.01); G01R 31/08 (2020.01)
CPC G01R 31/1272 (2013.01) [G01R 15/16 (2013.01); G01R 19/2513 (2013.01); G01R 31/081 (2013.01); G01R 31/085 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A system comprising:
a node comprising a first capacitive sensor configured to capacitively couple to a first shield layer of a first cable of a multi-phase electric power line, and further configured to collect, from the first cable, first sensor data indicative of a first alternating-current (AC) electrical signal in the first cable, and second capacitive senor configured to capacitively couple to a second shield layer of a second cable of the multi-phase electric power line, and further configured to collect, from the second cable, second sensor data indicative of a second AC electrical signal in the second cable, wherein the first capacitive sensor is configured to capacitively couple to the first shield layer of the first cable in a floating manner without being grounded and the second capacitive senor is configured to capacitively couple to the second shield layer of the second cable of the multi-phase electric power line in the floating manner without being grounded;
a first high-pass filter operatively coupled to the first capacitive sensor, and a second high-pass filter operatively coupled to the second capacitive sensor, wherein the first and second high pass filters are configured to filter out low-frequency signals from the first and second sensor data; and
processing circuitry operatively coupled to the first and second high-pass filters and configured to detect, based on a differential signal of the first and second filtered sensor data, a partial discharge (PD) event at a location on the cable that is local to the node.