# US 11,116,116 B1 · Interference limiting enclosure for power flow devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,116,116 B1 - Document ID: US11116116B1 - Status: Granted - Kind: B1 - Application number: 16/557,729 - Filed: 2019-08-30 - Granted: 2021-09-07 - Earliest claimed: 2018-12-14 - Assignees: Smart Wires Inc. - Applicants: Smart Wires Inc. - Inventors: Haroon Inam; Ali Farahani; Govind Chavan; Arthur Kelley; Shaiq Aman-ul-haq; Amrit Iyer - Web page: https://patentgrep.com/patent/US11116116B1 ## CPC - H05K 7/14339: {specially adapted for high voltage operation} - H01C 7/108: Metal oxide - H01H 33/66: Vacuum switches - H05K 9/0003: {Shielded walls, floors, ceilings, e.g. wallpaper, wall panel, electro-conductive plaster, concrete, cement, mortar} - H05K 9/0007: {Casings (standardised racks H05K9/0062)} - H05K 9/0049: {being metallic containers} - H05K 9/0081: {Electromagnetic shielding materials, e.g. EMI, RFI shielding (H05K9/0003 takes precedence)} - H01H 9/542: {Contacts shunted by static switch means} - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - H01C: RESISTORS - 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) ## Abstract An enclosure includes a power flow control device to attach to a high voltage transmission line, a plurality of panels formed of metal, a shorting connection provided between each pair of panels, an electrical connection from at least one panel of the plurality of panels to the high voltage transmission line, a receiving region provided on each panel for each shorting connection, and an equipotential surface for reducing electromagnetic interference from the high voltage transmission line to internal components of the power flow control device, and from the internal components of the power flow control device to the high voltage transmission line. ## Claims ### Claim 1 An enclosure comprising: a power flow control device to attach to a high voltage transmission line; a plurality of panels formed of metal; a shorting connection provided between each pair of panels; an electrical connection from at least one panel of the plurality of panels to the high voltage transmission line; a receiving region provided on each panel for each shorting connection; and an equipotential surface for reducing electromagnetic interference from the high voltage transmission line to internal components of the power flow control device, and from the internal components of the power flow control device to the high voltage transmission line. ### Claim 2 (depends on 1) The enclosure of claim 1, further comprising: a steel plate for dividing the enclosure into a first current area and a second current area which is lower in current than the first current area. ### Claim 3 (depends on 1) The enclosure of claim 1, further comprising: a plurality of current switches connected in series and configured to function as a current bypass switch during a fault condition. ### Claim 4 (depends on 3) The enclosure of claim 3, further comprising: a vacuum interrupter to interrupt a current flowing in a sensing/interrupter branch of the current bypass switch. ### Claim 5 (depends on 4) The enclosure of claim 4, further comprising: at least one differential mode choke connected in series with the vacuum interrupter. ### Claim 6 (depends on 1) The enclosure of claim 1, further comprising: a conductive gasket disposed between mating surfaces of panels; and means for compressing the conductive gasket between the mating surfaces of the panels. ### Claim 7 (depends on 1) The enclosure of claim 1, further comprising: a pair of power line connectors mounted externally to the enclosure to connect to the high voltage transmission line. ### Claim 8 (depends on 1) The enclosure of claim 1, further comprising: a corona ring mounted externally to the enclosure to reduce arcs to adjacent structures or to ground. ### Claim 9 (depends on 1) The enclosure of claim 1, further comprising: a metal oxide varistor to protect against transient voltage spikes. ### Claim 10 (depends on 1) The enclosure of claim 1, wherein the plurality of panels are aluminum panels. ### Claim 11 (depends on 1) The enclosure of claim 1, wherein the shorting connection comprises a shorting strap. ### Claim 12 (depends on 1) The enclosure of claim 1, further comprising: at least one differential mode choke connected in series with a vacuum interrupter; and a plurality of current switches connected in parallel with the at least one differential mode choke and the vacuum interrupter, wherein the plurality of current switches is configured to function as a current bypass during a fault condition. ### Claim 13 (depends on 1) The enclosure of claim 1, further comprising: a lifting bracket mounted on a top of the enclosure. ### Claim 14 A method for reducing electrical interference in a power flow control device connected to a high voltage transmission line, the method comprising: providing a sealed enclosure around the power flow control device wherein a plurality of panels, formed of metal, are attached together with conductive gaskets therebetween; providing a shorting connection between each pair of the plurality of panels; providing an electrical connection between at least one of the plurality of panels and the high voltage transmission line; providing a receiving region on each panel for each shorting connection; and providing an equipotential assembly that floats at a potential of the high voltage transmission line, wherein the equipotential assembly comprises the sealed enclosure, whereby electromagnetic interference is reduced from the high voltage transmission line to internal components of the power flow control device, and from the internal components of the power flow control device to the high voltage transmission line. ### Claim 15 (depends on 14) The method of claim 14, further comprising: providing a steel plate for dividing the sealed enclosure into a first current area and a second current area which is lower in current than the first current area. ### Claim 16 (depends on 14) The method of claim 14, further comprising: providing a plurality of current switches connected in series and configured to function as a current bypass switch during a fault condition. ### Claim 17 (depends on 14) The method of claim 14, wherein the plurality of panels are aluminum panels. ### Claim 18 (depends on 14) The method of claim 14, further comprising: interrupting, by using a vacuum interrupter, a current flowing in the high voltage transmission line. ### Claim 19 (depends on 14) The method of claim 14, further comprising: connecting, by using a pair of power line connectors, the power flow control device to the high voltage transmission line. ### Claim 20 (depends on 14) The method of claim 14, further comprising: identifying, by a controller, that a fault current exists in an impedance injection module; closing a vacuum interrupter in response to identifying that the fault current exists, the vacuum interrupter coupled in series with at least one differential mode choke; and closing a plurality of current switches to pass the fault current, the plurality of current switches coupled in parallel with the vacuum interrupter and the at least one differential mode choke, whereby the impedance injection module is protected from the fault current.