US 12,438,356 B2
Devices for monitoring and protecting power circuits
Vincent Chaperon, Blagnac (FR); and Damien Elmaalouf, Blagnac (FR)
Assigned to SAFRAN ELECTRICAL & POWER, Blagnac (FR)
Appl. No. 18/036,071
Filed by SAFRAN ELECTRICAL & POWER, Blagnac (FR)
PCT Filed Nov. 5, 2021, PCT No. PCT/FR2021/051955
§ 371(c)(1), (2) Date May 9, 2023,
PCT Pub. No. WO2022/096836, PCT Pub. Date May 12, 2022.
Claims priority of application No. 2011493 (FR), filed on Nov. 9, 2020.
Prior Publication US 2023/0411952 A1, Dec. 21, 2023
Int. Cl. H02H 3/347 (2006.01); H02H 3/33 (2006.01)
CPC H02H 3/347 (2013.01) [H02H 3/335 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A device for monitoring and protecting equipment powered by at least one solid-state power controller called SSPC, said device including at least one current measurement circuit comprising:
a current measuring transformer comprising a primary through which at least three phases of a three-phase power supply of the equipment or at least the phase of a single-phase power supply of the equipment pass and provided at a secondary with at least two measurement windings for measuring the current at the primary,
a measuring and testing module including a measuring and testing controller provided with at least one analog input connected to at least one of said measurement windings by a measurement channel for measuring a current at the secondary, representative of a differential current Id at the primary and provided with a measurement program and a digital channel for communication with said SSPC for controlling a switch of said SSPC in the event that said current Id exceeds a given threshold;
wherein said module includes a channel for injecting current into said transformer, said channel comprising a current Iinj generator controlled by an output of the measuring and testing controller and connected to an injection winding on said transformer, said injection winding including a number of turns Ninj adapted so that the current Iinj produces in said measurement windings a test current Im of said secondary in the absence of current at the primary and said module includes a test program adapted to control a current injection in parallel with a current measurement;
and wherein said at least two measurement windings at the secondary are such that a first measurement winding is adapted for a measurement of a leakage current at the primary in a range 0 to 100 milliamps and a second measurement winding is adapted for a measurement of a leakage current at the primary in a range of 0 to 2 amps.