Patents by Inventor Francesco Pisu
Francesco Pisu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10553378Abstract: An electric switching device filled with a dielectric insulating medium includes first and second arcing contact, first exhaust volume downstream of first arcing contact and second exhaust volume downstream of second arcing contact. The exhaust volumes includes several first openings in their walls, through which the insulating medium exits into third volume. The third volume is arranged around the first or second exhaust volume and is radially delimited by the wall of the exhaust volumes and by an exterior wall having second openings through which the insulating medium exits the third volume. One baffle device is provided inside third volume such that vortex flow of the insulating medium is generated when it passes the baffle device on its way towards the second openings. Turbulent flow conditions are chosen such that gravitational force allows to trap or contributes to trap particles in the baffle device.Type: GrantFiled: September 24, 2018Date of Patent: February 4, 2020Assignee: ABB Schweiz AGInventors: Francesco Pisu, Mahesh Dhotre, Xiangyang Ye, Johan Karl Filip Costyson, Reto Karrer
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Publication number: 20190035579Abstract: An electric switching device filled with a dielectric insulating medium includes first and second arcing contact, first exhaust volume downstream of first arcing contact and second exhaust volume downstream of second arcing contact. The exhaust volumes includes several first openings in their walls, through which the insulating medium exits into third volume. The third volume is arranged around the first or second exhaust volume and is radially delimited by the wall of the exhaust volumes and by an exterior wall having second openings through which the insulating medium exits the third volume. One baffle device is provided inside third volume such that vortex flow of the insulating medium is generated when it passes the baffle device on its way towards the second openings. Turbulent flow conditions are chosen such that gravitational force allows to trap or contributes to trap particles in the baffle device.Type: ApplicationFiled: September 24, 2018Publication date: January 31, 2019Inventors: Francesco Pisu, Mahesh Dhotre, Xiangyang Ye, Johan Karl Filip Costyson, Reto Karrer
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Patent number: 9905377Abstract: The invention relates to a circuit breaker comprising a first and a second contact assembly, wherein one of the contact assemblies comprises contact fingers arranged in a finger cage configuration and the other contact assembly comprises a tube or rod contact. The contact fingers comprise an impact point where the tube or rod impacts the contact fingers for the first time during electrical connection establishment, and a contact zone which contacts the tube or rod when the electrical connection is established. The contact zone comprises two contact points separated from one another and arranged on a line which is perpendicular to the longitudinal axis.Type: GrantFiled: May 6, 2016Date of Patent: February 27, 2018Assignee: ABB Schweiz AGInventors: Francesco Pisu, Fredrik Lundqvist, Jakub Korbel, Johan Costyson, Kansara Krunal, Mattias Runnberg, Sami Kotilainen, Raphael Rijo-Rude
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Patent number: 9627153Abstract: An electrical switching device for medium or high voltage circuits having at least a nominal contact arrangement, wherein the nominal contact arrangement includes at least a first nominal contact including a plurality of contact fingers forming a finger cage concentric with respect to a longitudinal axis, wherein the contact fingers are separated from one another by empty slots extending up to a free end of the contact fingers. The empty slots include first and second empty slots, wherein the second empty slots are shorter than the first empty slots, and wherein the contact fingers are grouped in groups, with the contact fingers of each group being separated by second empty slots and the contact fingers of adjacent groups being separated by first empty slots.Type: GrantFiled: November 13, 2013Date of Patent: April 18, 2017Assignee: ABB Schweiz AGInventors: Francesco Pisu, Helmut Heiermeier, Jadran Kostovic, Jakub Korbel, Luca Lienhard, Reto Karrer, Timothy Sutherland
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Patent number: 9543087Abstract: An electrical switching device including at least a nominal contact arrangement, the nominal contact arrangement at least a first nominal contact with a plurality of nominal contact fingers forming a finger cage concentric with respect to a longitudinal axis (z), and at least a mating second nominal contact. An arcing contact arrangement including a first arcing contact and a mating second arcing contact. An arcing contact finger including at its free end a first impact area in which a first contacting to the second arcing contact occurs when closing, the electrical switching device. The first impact area is formed by a first planar surface arranged at an inclination angle (?) larger than zero degrees with respect to the longitudinal axis (z).Type: GrantFiled: May 13, 2015Date of Patent: January 10, 2017Assignee: ABB Schweiz AGInventors: Francesco Pisu, Jadran Kostovic, Sami Kotilainen, Timothy Sutherland
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Publication number: 20160329164Abstract: The invention relates to a circuit breaker comprising a first and a second contact assembly, wherein one of the contact assemblies comprises contact fingers arranged in a finger cage configuration and the other contact assembly comprises a tube or rod contact. The contact fingers comprise an impact point where the tube or rod, impacts the contact fingers for the first time during electrical connection establishment, and a contact zone which contacts the tube or rod when the electrical connection is established. The contact zone comprises two contact points separated from one another and arranged on a line which is perpendicular to the longitudinal axis.Type: ApplicationFiled: May 6, 2016Publication date: November 10, 2016Inventors: Francesco Pisu, Fredrik Lundqvist, Jakub Korbel, Johan Costyson, Kansara Krunal, Mattias Runnberg, Sami Kotilainen
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Patent number: 9412541Abstract: A circuit breaker including an ejection device with a compartment, in which an arc-extinction medium for improving circuit breaker operation is contained, and having an ejection orifice through which the arc-extinction medium is to be ejected, wherein the ejection orifice opens out into an injection zone of the circuit breaker in which the pressure is lower than in an arcing zone when an arc is present, and wherein the arc-extinction medium and/or exhaust-cooling medium is at least partially present in liquid form, when it is contained in the ejection device.Type: GrantFiled: June 13, 2014Date of Patent: August 9, 2016Assignee: ABB Technology AGInventors: Francesco Pisu, Francia Galindo-Lozano, Javier Mantilla, Mathias-Dominic Buergler, Nicola Gariboldi, Oliver Cossalter, Patrick Stoller, Stephan Grob, Sami Kotilainen
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Patent number: 9312085Abstract: A circuit breaker including an ejection device including an arc-extinction medium for improved extinction of an arc formed during a breaker operation and an exhaust-cooling medium for improved cooling of exhaust gases in the circuit breaker. Thereby, the arc-extinction liquid includes an organofluorine compound having a boiling point Tb at 1 bar higher than ?60° C. and being selected from the group of: a fluoroether; a fluoroamine; a fluoroketone; and mixtures thereof.Type: GrantFiled: June 12, 2014Date of Patent: April 12, 2016Assignee: ABB TECHNOLOGY AGInventors: Francesco Pisu, Francia Galindo-Lozano, Javier Mantilla, Mathias-Dominic Buergler, Nicola Gariboldi, Oliver Cossalter, Patrick Stoller, Stephan Grob, Sami Kotilainen
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Publication number: 20150248976Abstract: An electrical switching device including at least a nominal contact arrangement, the nominal contact arrangement at least a first nominal contact with a plurality of nominal contact fingers forming a finger cage concentric with respect to a longitudinal axis (z), and at least a mating second nominal contact. An arcing contact arrangement including a first arcing contact and a mating second arcing contact. An arcing contact finger including at its free end a first impact area in which a first contacting to the second arcing contact occurs when closing, the electrical switching device. The first impact area is formed by a first planar surface arranged at an inclination angle (?) larger than zero degrees with respect to the longitudinal axis (z).Type: ApplicationFiled: May 13, 2015Publication date: September 3, 2015Inventors: Francesco Pisu, Jadran Kostovic, Sami Kotilainen, Timothy Sutherland
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Publication number: 20150034599Abstract: A high voltage interrupter unit includes a switching chamber within which at least two electric contact elements of a contact system are arranged to be moved relative to one another. The contact system includes at least one mechanical element which is at least in part not in fixed mechanical connection with either of the two contact elements. In order to increase the mechanical endurance of the contact system, the at least one mechanical element is sheathed at least in part in a layer of a synthetic, abrasion resistant material.Type: ApplicationFiled: July 29, 2014Publication date: February 5, 2015Applicant: ABB TECHNOLOGY AGInventors: Olaf Hunger, Roman Good, Reto Karrer, Manuel Gotti, Francesco Pisu, Jürg Nufer, Johan Costyson, Jakub Korbel, Roman Frei, Florian Brandl, Jörg Becherer
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Publication number: 20140291292Abstract: A circuit breaker including an ejection device with a compartment, in which an arc-extinction medium for improving circuit breaker operation is contained, and having an ejection orifice through which the arc-extinction medium is to be ejected, wherein the ejection orifice opens out into an injection zone of the circuit breaker in which the pressure is lower than in an arcing zone when an arc is present, and wherein the arc-extinction medium and/or exhaust-cooling medium is at least partially present in liquid form, when it is contained in the ejection device.Type: ApplicationFiled: June 13, 2014Publication date: October 2, 2014Inventors: Francesco Pisu, Francia Galindo-Lozano, Javier Mantilla, Mathias-Dominic Buergler, Nicola Gariboldi, Oliver Cossalter, Patrick Stoller, Stephan Grob, Sami Kotilainen
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Publication number: 20140291291Abstract: A circuit breaker including an ejection device including an arc-extinction medium for improved extinction of an arc formed during a breaker operation and an exhaust-cooling medium for improved cooling of exhaust gases in the circuit breaker. Thereby, the arc-extinction liquid includes an organofluorine compound having a boiling point Tb at 1 bar higher than ?60° C. and being selected from the group of: a fluoroether; a fluoroamine; a fluoroketone; and mixtures thereof.Type: ApplicationFiled: June 12, 2014Publication date: October 2, 2014Inventors: Francesco Pisu, Francia Galindo-Lozano, Javier Mantilla, Mathias-Dominic Buergler, Nicola Gariboldi, Oliver Cossalter, Patrick Stoller, Stephan Grob, Sami Kotilainen
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Publication number: 20140131183Abstract: An electrical switching device for medium or high voltage circuits having at least a nominal contact arrangement, wherein the nominal contact arrangement includes at least a first nominal contact including a plurality of contact fingers forming a finger cage concentric with respect to a longitudinal axis, wherein the contact fingers are separated from one another by empty slots extending up to a free end of the contact fingers. The empty slots include first and second empty slots, wherein the second empty slots are shorter than the first empty slots, and wherein the contact fingers are grouped in groups, with the contact fingers of each group being separated by second empty slots and the contact fingers of adjacent groups being separated by first empty slots.Type: ApplicationFiled: November 13, 2013Publication date: May 15, 2014Inventors: Francesco Pisu, Helmut Heiermeier, Jadran Kostovic, Jakub Korbel, Luca Lienhard, Reto Karrer, Timothy Sutherland