US 11,686,758 B2
Arc fault detection device with wideband sensor
Matija Varga, Zürich (CH); Yannick Maret, Dättwil (CH); Agostino Butti, Milan (IT); Antonio Currà, Abbiategrasso (IT); Vittorio Cozzi, Arluno (IT); and Luca Ghezzi, Gallarate (IT)
Assigned to ABB Schweiz AG, Baden (CH)
Filed by ABB Schweiz AG, Baden (CH)
Filed on Sep. 24, 2021, as Appl. No. 17/484,055.
Claims priority of application No. 20198185 (EP), filed on Sep. 24, 2020.
Prior Publication US 2022/0091172 A1, Mar. 24, 2022
Int. Cl. G01R 31/08 (2020.01); G01R 31/12 (2020.01); H02H 1/00 (2006.01); H02H 3/16 (2006.01)
CPC G01R 31/085 (2013.01) [G01R 31/08 (2013.01); G01R 31/1272 (2013.01); H02H 1/0015 (2013.01); H02H 3/16 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An arc fault detection device for detecting an arc fault in an electric line, the arc fault detection device comprising:
a first terminal and a second terminal configured to connect the arc fault detection device to a conductor of the electric line;
a sensor configured to generate a sensor signal from a current through the electric line;
a circuit breaker configured to interrupt the electric line; and
a controller configured to detect the arc fault from the sensor signal;
wherein the sensor comprises an inductor connected to the first terminal and the second terminal and a capacitor connected in parallel with the inductor,
wherein the inductor and the capacitor form a resonant circuit with a resonance frequency, the resonance frequency determining an impedance behavior of the resonant circuit,
wherein the inductor and a capacitance of the capacitor are chosen such that the impedance behavior of the resonant circuit corresponds to a desired impedance behavior over a relevant frequency range of the current through the electric line, and
wherein the inductor is a magnetic actuator configured to operate the circuit breaker.