# US 10,690,700 B2 · Multiple core transformer assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,690,700 B2 - Document ID: US10690700B2 - Status: Granted - Kind: B2 - Application number: 16/434,409 - Filed: 2019-06-07 - Published: 2019-09-19 - Granted: 2020-06-23 - Earliest claimed: 2016-10-07 - Assignees: Leviton Manufacturing Co., Inc. - Applicants: Leviton Manufacturing Company, Inc. - Inventors: Ronald Jansen; Michael Kamor; Michael Ostrovsky; Alfred J. Lombardi - Web page: https://patentgrep.com/patent/US10690700B2 ## CPC - G01R 31/52: Testing for short-circuits, leakage current or ground faults - G01R 15/183: {using transformers with a magnetic core} - G01R 19/0092: {Measuring current only} - H01F 17/04: with magnetic core - H01F 41/0206: {Manufacturing of magnetic cores by mechanical means (magnetic cores per se H01F27/24)} - H01H 1/00: Contacts (liquid contacts H01H29/04) - H01H 83/144: {with differential transformer} - H02H 3/16: responsive to fault current to earth, frame or mass (with balanced or differential arrangement H02H3/26 {; monitoring earth connection H02H5/105}) - H01H 2083/146: {Provisions for avoiding disadvantages of having asymetrical primaries, e.g. induction of a magnetic field even by zero difference current} - H02H 1/0007: {concerning the detecting means (in general G01R or other subclasses of G01; reed switches H01H71/2445)} - H02H 3/33: using summation current transformers (H02H3/347 takes precedence) - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00) - H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H) ## Abstract A circuit interrupting device includes a grounded neutral transformer core, a high frequency transformer core, and a differential transformer core nested within the grounded neutral transformer core and/or the high frequency transformer core. The grounded neutral transformer core and the high frequency transformer core are disposed in a stacked configuration with one another. ## Claims ### Claim 1 A circuit interrupting device comprising: a current sensor core; a core assembly defining a longitudinal axis and including: a grounded neutral transformer core; a high frequency transformer core, the grounded neutral transformer core and the high frequency transformer core are stacked along the longitudinal axis; and a differential transformer core disposed within a cavity defined by both the grounded neutral transformer core and the high frequency transformer core. ### Claim 2 (depends on 1) The circuit interrupting device of claim 1, wherein the high frequency transformer core is a non-ferrous core. ### Claim 3 (depends on 1) The circuit interrupting device of claim 1, further comprising a printed circuit board, wherein the core assembly is located on one side of the printed circuit board and the current sensor core is located on the other side of the printed circuit board. ### Claim 4 (depends on 1) The circuit interrupting device of claim 1, wherein the differential transformer core extends along at least a portion of a height of the grounded neutral transformer core and at least a portion of a height of the high frequency transformer core, the height of each of the grounded neutral transformer core and the high frequency transformer core being defined along the longitudinal axis. ### Claim 5 (depends on 1) The circuit interrupting device of claim 1, wherein at least one of the cores of the core assembly has a cross-section having a perimeter, wherein the perimeter has one or more portions selected from the group consisting of a straight portion and an arcuate portion. ### Claim 6 (depends on 1) The circuit interrupting device of claim 1, further comprising a non-ferrous spacer being configured to position the differential transformer core within the core assembly. ### Claim 7 (depends on 1) The circuit interrupting device of claim 1, further comprising a magnetic shield disposed below the differential transformer core. ### Claim 8 (depends on 1) The circuit interrupting device of claim 1, further comprising a magnetic shield disposed in abutment with the differential transformer core. ### Claim 9 (depends on 1) The circuit interrupting device of claim 1, further comprising a magnetic shield defining a cavity, wherein the differential transformer core defines a differential core cavity, the cavity of the magnetic shield being aligned at least partially with respect to the differential core cavity. ### Claim 10 (depends on 1) The circuit interrupting device of claim 1, further comprising a magnetic shield at least partially surrounding the differential transformer core. ### Claim 11 (depends on 1) The circuit interrupting device of claim 1, wherein the differential transformer core is configured to receive a plurality of conductive paths therethrough. ### Claim 12 (depends on 11) The circuit interrupting device of claim 11, wherein the differential transformer core is arranged symmetrically about the plurality of conductive paths. ### Claim 13 A method of manufacturing a circuit interrupting device, comprising: arranging a plurality of cores into a core assembly, the plurality of cores including a grounded neutral transformer core, a high frequency transformer core, and a differential transformer core, each of the plurality of cores configured to selectively output a signal, wherein the step of arranging further includes: stacking the grounded neutral transformer core and the high frequency transformer core along a longitudinal axis defined by the core assembly; and disposing the differential transformer core at least partially within a cavity defined by both the grounded neutral transformer core and the high frequency transformer core. ### Claim 14 (depends on 13) The method of claim 13, further comprising: extending a conductive path through the cavity; applying a fault signal indicative of an electrical fault on the conductive path; selecting at least one of the plurality of cores and taking a first measurement of a frequency response of the output signal of the selected core; tuning the selected core such that the frequency response is varied; and taking a second measurement of the frequency response. ### Claim 15 (depends on 14) The method of claim 14 wherein the step of tuning includes varying at least one characteristic of the selected core, the characteristic selected from the group consisting of: a height; an inside diameter; an outside diameter; a cross-sectional shape; a cross-sectional area; a number of winding turns; a winding wire gauge; and a spacing of the winding turns. ### Claim 16 (depends on 14) The method of claim 14 wherein the second measurement of the frequency response of the output signal of the selected core is narrowed. ### Claim 17 (depends on 16) The method of claim 16 wherein the fault signal includes one or more of a ground fault and an arc fault. ### Claim 18 (depends on 17) The method of claim 17, wherein the frequency response of the output signal of the selected core is aligned with respect to wide band noise indicative of the fault signal. ### Claim 19 (depends on 14) The method of claim 14, further comprising: receiving the output signal of the selected core at an input of a signal processor circuit; the signal processor circuit generating a processed signal output; wherein the step of tuning further includes varying the processing done by the signal processor circuit. ### Claim 20 (depends on 19) The method of claim 19, wherein the signal processor circuit further includes an amplifier having a gain and the step of varying the processing done by the signal processor circuit further includes varying the gain of the amplifier. ### Claim 21 (depends on 19) The method of claim 19, wherein the signal processor circuit further includes a resistor-capacitor (RC) network, wherein the step of varying the processing done by the signal processor circuit further includes varying the value of one or more of a resistor and a capacitor of the RC network. ### Claim 22 (depends on 19) The method of claim 19, wherein the signal processor circuit further includes a processor, wherein the step of varying the processing done by the signal processor circuit further includes varying a programming of the processor.