US 12,224,576 B2
Protection circuitry for a downhole measurement tool
Robert J. Schapper, Salt Lake City, UT (US)
Assigned to ChampionX LLC, Sugar Land, TX (US)
Filed by ChampionX LLC, Sugar Land, TX (US)
Filed on Mar. 8, 2023, as Appl. No. 18/180,641.
Prior Publication US 2024/0305088 A1, Sep. 12, 2024
Int. Cl. H02H 7/08 (2006.01); E21B 17/02 (2006.01); E21B 43/12 (2006.01); E21B 47/017 (2012.01)
CPC H02H 7/08 (2013.01) [E21B 17/028 (2013.01); E21B 43/128 (2013.01); E21B 47/017 (2020.05)] 24 Claims
OG exemplary drawing
 
1. A downhole system capable of balancing an alternating current between a power cable or a downhole motor of an electrical submersible pump and a downhole measurement tool during a phase-to-ground fault condition, the downhole system comprising:
an electrical connection between a Y-point of the downhole motor of the electrical submersible pump and the downhole measurement tool; and
a triggerable network that selectively conducts during an application of a negative polarity voltage to the downhole measurement tool during the phase-to-ground fault condition, the triggerable network comprising:
a silicon-controlled rectifier having an anode and a cathode on a first path of current conduction for the negative polarity voltage during the phase-to-ground fault condition; and
one or more first Zener diodes, wherein an ending anode of the one or more first Zener diodes is coupled to a gate of the silicon-controlled rectifier and an ending cathode of the first one or more Zener diodes is coupled to the anode of the silicon-controlled rectifier.