Patents by Inventor Zafiris G. Politis
Zafiris G. Politis 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: 10447026Abstract: A circuit protection device is provided. The circuit protection device includes an active energy absorber that is coupled between two power lines in an electrical power distribution system and is configured to selectively conduct fault current responsive to overvoltage conditions. The active energy absorber includes an overvoltage protection module that includes two thyristors that are connected in anti-parallel with one another and a varistor that is connected with the overvoltage protection module as a series circuit. The series circuit including the varistor and the overvoltage protection module is connected between the power lines.Type: GrantFiled: December 23, 2016Date of Patent: October 15, 2019Assignee: RIPD IP DEVELOPMENT LTDInventors: Grigoris Kostakis, Zafiris G. Politis, Fotis Xepapas, Alexis Chorozoglou, Christos Prevezianos
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Patent number: 10447023Abstract: A crowbar module includes first and second electrical terminals, a module housing, and first and second crowbar units. The first crowbar unit is disposed in the module housing and includes a first thyristor electrically connected between the first and second electrical terminals. The second crowbar unit is disposed in the module housing and includes a second thyristor electrically connected between the first and second electrical terminals in electrical parallel with the first crowbar unit.Type: GrantFiled: March 16, 2016Date of Patent: October 15, 2019Assignee: RIPD IP Development LtdInventors: Zafiris G. Politis, Grigoris Kostakis, Thomas Tsovilis, Kostas Bakatsias
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Publication number: 20190252142Abstract: A surge protective device (SPD) module includes a module housing, first and second module electrical terminals mounted on the module housing, a gas discharge tube (GDT) mounted in the module housing, and a fail-safe mechanism mounted in the module housing. The GDT includes a first GDT terminal electrically connected to the first module electrical terminal and a second GDT terminal electrically connected to the second module electrical terminal. The fail-safe mechanism includes: an electrically conductive shorting bar positioned in a ready position and repositionable to a shorting position; a biasing member applying a biasing load to the shorting bar to direct the shorting bar from the ready position to the shorting position; and a meltable member. The meltable member maintains the shorting bar in the ready position and melts in response to a prescribed temperature to permit the shorting bar to transition from the ready position to the shorting position under the biasing load of the biasing member.Type: ApplicationFiled: April 25, 2019Publication date: August 15, 2019Inventors: Sebastjan Kamensek, Tadej Knez, Igor Juricev, Milenko Vukotic, Thomas Tsovilis, Zafiris G. Politis
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Patent number: 10340688Abstract: A modular overvoltage protection unit for electrically connecting a first power line and/or a second power line to a protected earth (PE) line in the case of an overvoltage event on the first or second power line includes a unit enclosure defining an enclosure cavity, and first and second surge protection devices (SPDs) each disposed in the enclosure cavity. Each of the first and second SPDs includes: a first electrode in the form of a metal housing defining a housing cavity; a second electrode disposed within the housing cavity; and a varistor member captured between and electrically connected with each of the first and second electrodes, wherein the varistor member is formed of a varistor material.Type: GrantFiled: January 12, 2018Date of Patent: July 2, 2019Assignee: RIPD IP ASSETS LTDInventors: Thomas Tsovilis, Eva Giannelaki, Fani Asimakopoulou, Konstantinos Bakatsias, Zafiris G. Politis
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Patent number: 10319545Abstract: A surge protective device (SPD) module includes a module housing, first and second module electrical terminals mounted on the module housing, a gas discharge tube (GDT) mounted in the module housing, and a fail-safe mechanism mounted in the module housing. The GDT includes a first GDT terminal electrically connected to the first module electrical terminal and a second GDT terminal electrically connected to the second module electrical terminal. The fail-safe mechanism includes: an electrically conductive shorting bar positioned in a ready position and repositionable to a shorting position; a biasing member applying a biasing load to the shorting bar to direct the shorting bar from the ready position to the shorting position; and a meltable member. The meltable member maintains the shorting bar in the ready position and melts in response to a prescribed temperature to permit the shorting bar to transition from the ready position to the shorting position under the biasing load of the biasing member.Type: GrantFiled: November 30, 2016Date of Patent: June 11, 2019Assignee: Iskra Za{hacek over (s)}{hacek over (c)}ite d.o.o.Inventors: Sebastjan Kamen{hacek over (s)}ek, Tadej Knez, Igor Juri{hacek over (c)}ev, Milenko Vukotić, Thomas Tsovilis, Zafiris G. Politis
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Publication number: 20190080837Abstract: An inductor assembly includes a coil including a spirally wound metal foil.Type: ApplicationFiled: August 28, 2018Publication date: March 14, 2019Inventors: Grigoris Kostakis, Megaklis Marathias, Fotis Xepapas, Kostas Bakatsias, George Peppas, Zafiris G. Politis
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Publication number: 20180213091Abstract: A power transmission system includes a voltage measurement device located on a tower or rooftop for measuring a voltage (VRRH) at a top end of a DC cable connected to a remote radio head (RRH). A voltage control system receives an input voltage (VIN) from a DC power supply and generates an output voltage (VOUT) at a base end of the DC cable. The voltage control system calculates a voltage drop on the DC cable based on the VRRH measurement and then adds different voltage steps to VIN so VOUT compensates for the voltage drop. Calculating the voltage drop allows the PTS to more efficiently supply power to RRHs without having to increase the size of DC power cables.Type: ApplicationFiled: January 19, 2018Publication date: July 26, 2018Inventors: Grigoris KOSTAKIS, Anestis KOLOVOS, Nikolaol TSAKIRIDIS, Michael C. BLOXHAM, Shawn A. WARNER, Fotis XEPAPAS, Zafiris G. POLITIS
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Publication number: 20180183230Abstract: A circuit protection device is provided. The circuit protection device includes an active energy absorber that is coupled between two power lines in an electrical power distribution system and is configured to selectively conduct fault current responsive to overvoltage conditions. The active energy absorber includes an overvoltage protection module that includes two thyristors that are connected in anti-parallel with one another and a varistor that is connected with the overvoltage protection module as a series circuit. The series circuit including the varistor and the overvoltage protection module is connected between the power lines.Type: ApplicationFiled: December 23, 2016Publication date: June 28, 2018Inventors: Grigoris Kostakis, Zafiris G. Politis, Fotis Xepapas, Alexis Chorozoglou, Christos Prevezianos
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Publication number: 20180183232Abstract: An overvoltage protection device includes a first electrode member, a second electrode member, and a varistor assembly. The varistor assembly includes: a plurality of varistor wafers each formed of a varistor material; and at least one electrically conductive interconnect member connecting the varistor wafers in electrical parallel between the first and second electrode members. The varistor wafers are axially stacked between the first and second electrodes.Type: ApplicationFiled: October 27, 2017Publication date: June 28, 2018Inventors: Tine Tavcar, Sasa Rustja, Alexis Chorozoglou, George Peppas, Fotis Xepapas, Zafiris G. Politis
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Publication number: 20180151318Abstract: A surge protective device (SPD) module includes a module housing, first and second module electrical terminals mounted on the module housing, a gas discharge tube (GDT) mounted in the module housing, and a fail-safe mechanism mounted in the module housing. The GDT includes a first GDT terminal electrically connected to the first module electrical terminal and a second GDT terminal electrically connected to the second module electrical terminal. The fail-safe mechanism includes: an electrically conductive shorting bar positioned in a ready position and repositionable to a shorting position; a biasing member applying a biasing load to the shorting bar to direct the shorting bar from the ready position to the shorting position; and a meltable member. The meltable member maintains the shorting bar in the ready position and melts in response to a prescribed temperature to permit the shorting bar to transition from the ready position to the shorting position under the biasing load of the biasing member.Type: ApplicationFiled: November 30, 2016Publication date: May 31, 2018Inventors: Sebastjan Kamensek, Tadej Knez, Igor Juricev, Milenko Vukotic, Thomas Tsovilis, Zafiris G. Politis
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Publication number: 20180138698Abstract: A modular overvoltage protection unit for electrically connecting a first power line and/or a second power line to a protected earth (PE) line in the case of an overvoltage event on the first or second power line includes a unit enclosure defining an enclosure cavity, and first and second surge protection devices (SPDs) each disposed in the enclosure cavity. Each of the first and second SPDs includes: a first electrode in the form of a metal housing defining a housing cavity; a second electrode disposed within the housing cavity; and a varistor member captured between and electrically connected with each of the first and second electrodes, wherein the varistor member is formed of a varistor material.Type: ApplicationFiled: January 12, 2018Publication date: May 17, 2018Inventors: Thomas Tsovilis, Eva Giannelaki, Fani Asimakopoulou, Konstantinos Bakatsias, Zafiris G. Politis
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Patent number: 9906017Abstract: A modular overvoltage protection unit for electrically connecting a first power line and/or a second power line to a protected earth (PE) line in the case of an overvoltage event on the first or second power line includes a unit enclosure defining an enclosure cavity, and first and second surge protection devices (SPDs) each disposed in the enclosure cavity. Each of the first and second SPDs includes: a first electrode in the form of a metal housing defining a housing cavity; a second electrode disposed within the housing cavity; and a varistor member captured between and electrically connected with each of the first and second electrodes, wherein the varistor member is formed of a varistor material.Type: GrantFiled: May 19, 2015Date of Patent: February 27, 2018Assignee: RIPD RESEARCH AND IP DEVELOPMENT LTD.Inventors: Thomas Tsovilis, Eva Giannelaki, Fani Asimakopoulou, Konstantinos Bakatsias, Zafiris G. Politis
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Publication number: 20160276821Abstract: A crowbar module includes first and second electrical terminals, a module housing, and first and second crowbar units. The first crowbar unit is disposed in the module housing and includes a first thyristor electrically connected between the first and second electrical terminals. The second crowbar unit is disposed in the module housing and includes a second thyristor electrically connected between the first and second electrical terminals in electrical parallel with the first crowbar unit.Type: ApplicationFiled: March 16, 2016Publication date: September 22, 2016Inventors: Zafiris G. Politis, Grigoris Kostakis, Thomas Tsovilis, Kostas Bakatsias
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Publication number: 20150349523Abstract: A modular overvoltage protection unit for electrically connecting a first power line and/or a second power line to a protected earth (PE) line in the case of an overvoltage event on the first or second power line includes a unit enclosure defining an enclosure cavity, and first and second surge protection devices (SPDs) each disposed in the enclosure cavity. Each of the first and second SPDs includes: a first electrode in the form of a metal housing defining a housing cavity; a second electrode disposed within the housing cavity; and a varistor member captured between and electrically connected with each of the first and second electrodes, wherein the varistor member is formed of a varistor material.Type: ApplicationFiled: May 19, 2015Publication date: December 3, 2015Inventors: Thomas Tsovilis, Eva Giannelaki, Fani Asimakopoulou, Konstantinos Bakatsias, Zafiris G. Politis
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Patent number: 9166312Abstract: A printed circuit board (PCB) assembly for use with first and second cables terminated with first and second cable lugs, respectively, wherein each of the first and second cable lugs includes two lug holes defined therein, the includes a PCB and a terminal block. The terminal block includes an electrically insulating base mounted on the PCB, and at least one electrically conductive conductor member mounted on the base and electrically connected to the PCB. The at least one conductor member is configured to engage each of the first and second cable lugs through the four lug holes thereof to electrically in-line terminate the first and second cables at the terminal block.Type: GrantFiled: March 20, 2014Date of Patent: October 20, 2015Assignee: Raycap, S.A.Inventors: Kostas Bakatsias, Jonathan Martinez, Zafiris G. Politis
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Publication number: 20150263442Abstract: A printed circuit board (PCB) assembly for use with first and second cables terminated with first and second cable lugs, respectively, wherein each of the first and second cable lugs includes two lug holes defined therein, the includes a PCB and a terminal block. The terminal block includes an electrically insulating base mounted on the PCB, and at least one electrically conductive conductor member mounted on the base and electrically connected to the PCB. The at least one conductor member is configured to engage each of the first and second cable lugs through the four lug holes thereof to electrically in-line terminate the first and second cables at the terminal block.Type: ApplicationFiled: March 20, 2014Publication date: September 17, 2015Applicant: Raycap, S.A.Inventors: Kostas Bakatsias, Jonathan Martinez, Zafiris G. Politis