Source: http://www.google.com/patents/US20030222747?dq=6,183,366
Timestamp: 2017-03-27 19:01:40
Document Index: 350498548

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Patent US20030222747 - Method and device for installing and removing a current transformer on and ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA current transformer to be installed around a current-carrying conductor. The transformer has a split core with two parts, which can be opened to allow the transformer to be installed around or removed from the current-carrying conductor. A winding wound on the core is operatively connected to a switch...http://www.google.com/patents/US20030222747?utm_source=gb-gplus-sharePatent US20030222747 - Method and device for installing and removing a current transformer on and from a current-carrying power lineAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS20030222747 A1Publication typeApplicationApplication numberUS 10/293,729Publication dateDec 4, 2003Filing dateNov 12, 2002Priority dateMay 28, 2002Also published asEP1508146A2, US6756776, WO2003100797A2, WO2003100797A3Publication number10293729, 293729, US 2003/0222747 A1, US 2003/222747 A1, US 20030222747 A1, US 20030222747A1, US 2003222747 A1, US 2003222747A1, US-A1-20030222747, US-A1-2003222747, US2003/0222747A1, US2003/222747A1, US20030222747 A1, US20030222747A1, US2003222747 A1, US2003222747A1InventorsJoseph Perkinson, Scott BrownOriginal AssigneeAmperion, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (11), Referenced by (57), Classifications (6), Legal Events (10) External Links: USPTO, USPTO Assignment, EspacenetMethod and device for installing and removing a current transformer on and from a current-carrying power line
BRIEF DESCRIPTION OF THE DRAWINGS [0025] [0025]FIG. 1 is a schematic representation showing a power line communications network. [0026] [0026]FIG. 2 is a schematic representation showing a current transformer and a device for shorting the winding of the current transformer, according to the present invention. [0027] [0027]FIG. 3 is a schematic representation showing another embodiment of the current transformer. [0028] [0028]FIG. 4a is a schematic representation showing a split core for use in a current transformer of FIG. 2, wherein the split core is in an open position. [0029] [0029]FIG. 4b is a schematic representation showing the split core of FIG. 4a in a closed position. [0030] [0030]FIG. 4c is a schematic representation showing another embodiment of the split core, according to the present invention, wherein the split core is in an open position. [0031] [0031]FIG. 4d is a schematic representation showing the split core of FIG. 4c in a closed position. [0032] [0032]FIG. 5a is a schematic representation showing a split core for use in a current transformer of FIG. 3, wherein the split core is in an open position. [0033] [0033]FIG. 5b is a schematic representation showing the split core of FIG. 5a in a closed position. [0034] [0034]FIG. 6 is a schematic representation showing a housing of the split core. BEST MODE TO CARRY OUT THE INVENTION [0035] The current transformer 90, as shown in FIG. 2, has a secondary winding 140 of Ns turns around a split core 100. When the winding is shorted, a current with a magnitude substantially equal to Ip/Ns is developed in the shorted winding through normal transformer action, where Ip is the current in the conductor 5. This current creates an opposing magnetic field in the core, canceling the spatially nonlinear magnetic field generated near the surface of the active power line 5 due to the current flow in the conductor. The magnetic field created by the shorted winding greatly minimizes the forces on the core caused by this spatially nonlinear magnetic field. The shorting of the winding both protects the split core parts 110, 120 when they are closed to form a substantially closed-loop and allows the opening of the split core parts with minimal force. [0036] Preferably, the current transformer 90 is placed in a housing 200, which may comprise a power supply 180 of which the current transformer is a part. In order to install the current transformer 90 on a power line 5 or to remove the current transformer 90 from the power line 5, it is preferable to use a tool 194 to cause the split core parts 110, 120 to close or to open. This tool 194 can also be used to short the secondary winding by closing a switch or shorting mechanism 192. The tool 194 and the switching mechanism 192 are disposed in a control assembly 190. [0037] As shown in FIG. 2, the two ends 142, 144 of the secondary winding 140 are connected to the shorting mechanism 192. The shorting mechanism 192 is operatively connected to the tool 194 that is used to cause the split core parts 110, 120 to close or to open. During the installation of the current transformer 90, the tool 194 causes the shorting mechanism 192 to close, thereby electrically connecting the ends 142, 144, and shorting the secondary winding 140 prior to closing the split core parts 110, 120 to form a substantially closed-loop around the conductor 5. After the installation is completed, the tool 194 can be disengaged from the core 100, keeping the split core parts 110, 120 in the “closed” position. At the same time, the tool 194 causes the shorting mechanism 194 to open, thereby allowing the secondary winding 140 to obtain the induced current through a transformer action. Preferably, the tool 194 is removed from the control assembly 190 and the housing 200 after the installation of the current transformer 90 is completed. [0038] During the removal of the current transformer 90 from the power line 5, the tool 194 is applied to the control assembly 190 of the housing 200. The tool 194 causes the shorting mechanism 192 to close, thereby shorting the secondary winding 140. Subsequently, the tool 194 causes the split core parts 110, 120 to separate, allowing the current transformer 90 to be removed from the conductor 5. [0039] It should be noted that the winding 140, when it is not shorted, is also used for generating the current conveyed to the power supply electronics 180, as shown in FIG. 2. When the winding 140 is not shorted, the winding 140 is “opened”. The term “opened” simply means that the two ends 142, 144 are not electrically connected with each other. In this context, the winding 140 can be used for obtaining induced current when the winding is “opened”. However, it is also possible to use two separate windings 140, 150 around the split core 100, as shown in FIG. 3. [0040] As shown in FIG. 3, the further secondary winding 150 is used for generating the current conveyed to the power supply electronics 180, while the secondary winding 140 is used for generating the opposing magnetic field in the core to cancel the spatially nonlinear magnetic field near the surface of the conductor. The two ends 152, 154 of the further secondary winding 150 are connected to the power supply electronics 180. The two ends 142, 144 of the secondary winding 140 are connected to the shorting mechanism 192. As with the embodiment shown in FIG. 2, the shorting mechanism 192 is operatively connected to the tool 194 that is used to cause the split core parts 110, 120 to close or to open. During the installation of the current transformer 90, the tool 194 causes the shorting mechanism 192 to close, thereby electrically connecting the ends 142, 144, and shorting the secondary winding 140 prior to closing the split core parts 110, 120 to form a substantially closed-loop around the conductor 5. The normally induced current of Ip/Ns in the further secondary winding 150 will be nearly zero because of the presence of the now shorted winding 140. This is true because the shorting mechanism 192 on the secondary winding 140 causes the voltage on the further secondary winding 150 through normal transformer action to be very low. The load presented by the power supply electronics 180 is nonlinear in nature and will not accept current with a low voltage at the further secondary winding 150. [0041] If the secondary winding 140 also has Nt turns around the split core 100, an induced current Ip/Nt in the secondary winding 140 creates an opposing magnetic field in the core, canceling the spatially nonlinear magnetic field generated near the surface of the active power line 5. It should be noted that the number of turns Ns on the further secondary winding 150 are chosen to satisfy the requirements of the power supply electronics 180, while the number of turns Nt on the secondary winding 140 are chosen for the requirements of the shorting mechanism 192. Thus, Nt can be chosen independently of Ns. However, Nt should be chosen so that neither the current Ip/Nt nor the voltage on the shorting mechanism 192, when it is opened, is too high. [0042] After the installation is completed, the tool 194 can be disengaged from the core 100, keeping the split core parts 110, 120 in the “closed” position. At the same time, the tool 194 causes the shorting mechanism 192 to open, thereby allowing the secondary winding 140 to obtain the induced current through a transformer action. Preferably, the tool 194 is removed from the control assembly 190 and the housing 200 after the installation of the current transformer 90 is completed. During the removal of the current transformer 90 from the power line 5, the tool 194 is applied to the control assembly 190 of the housing 200. The tool 194 causes the shorting mechanism 192 to close, thereby shorting the secondary winding 140. Subsequently, the tool 194 causes the split core parts 110, 120 to separate, allowing the current transformer 90 to be removed from the conductor 5. [0043] [0043]FIG. 4a is a schematic representation showing the split core 100 of the current transformer 90 of FIG. 2. As shown, the winding 140 is partially wound on the first split core part 110 and partially on the second split core part 120. The first split core part 110 has a first end 112 and a second end 114. The second split core part 120 has a first end 122 and a second end 124. When the split core 100 is in an open position, the first end 112 of the first split core part 110 and the first end 122 of the second split core part 120 form a gap 130. Likewise, the second end 114 of the first split core part 110 and the second end 124 of the second split core part 120 form a gap 132. When the first split core part 110 and the second split core part 120 are put together around the power line 5 to form a substantially closed loop transformer core, as shown in FIG. 4b, the spatially nonlinear magnetic field near the surface of the conductor 5 will exert a force on the first and second core parts 110 and 120. This force increases rapidly as the gaps 130 and 132 are reduced. [0044] As described in conjunction in FIG. 2, the force can be reduced or eliminated by shorting the ends 142, 144 of the secondary winding 140. After installation is completed and the split core parts 110, 120 is in the “closed” position, the shorting between the ends 142, 144 is removed, as shown in FIG. 4b. As shown, when the ends 142 and 144 are not shorted, the magnetic flux 160 in the split core 100 causes the winding 140 to induce a current, which is conveyed to the power supply electronics 180 (FIG. 2). It should be noted that the gaps 130 and 132 may not be completely closed when the split core 100 is in the “closed” position. An air gap 130′ could exist between the first end 112 of the first split core part 110 and the first end 122 of the second split core part 120. Likewise, an air gap 132′ could exist between the second end 114 of the first split core part 110 and the second end 124 of the second split core part 120. Preferably, the first end 142 and the second end 144 of the winding 140 are brought near the second ends 114 and 124 of the split core parts 110 and 120. [0045] The winding 140, as shown in FIGS. 4a and 4 b, is wound on both split core parts 110 and 120. In practice, because both parts must be separately installed in a housing, such as the housing 200 shown in FIG. 6, the linkage between the core parts 110 and 120 may not be desirable. Thus, it is preferable to have the winding 140 wound only on one of the split core parts. As shown in FIGS. 4c and 4 d, the secondary winding 140 is wound only on the split core part 110. [0046] [0046]FIG. 5b is a schematic representation showing the split core 100 of the current transformer 90 of FIG. 3. Advantageously, the secondary winding 140 is wound on the first split core part 110, and the further secondary winding 150 is wound on the second split core part 120. When the first split core part 110 and the second split core part 120 are put together around the power line 5 to form a substantially closed loop transformer core, as shown in FIG. 5b, the spatially nonlinear magnetic field near the surface of the conductor 5 will exert a force on the first and second core parts 110 and 120. This force increases rapidly as the gaps 130 and 132 are reduced. As described in conjunction in FIG. 3, the force can be reduced or eliminated by shorting the ends 142, 144 of the secondary winding 140. In this embodiment, the winding ends 152 and 154 of the further secondary winding 150 are not affected by the opening or closing of the split core parts 110, 120. After installation is completed and the split core parts 110, 120 are in the “closed” position, the shorting between the ends 142, 144 is removed, as shown in FIG. 5b. [0047] In order to facilitate the opening and closing of the split core 100, the split core parts 110 and 120 are separately disposed in the first half 202 and the second half 204 of the housing 200. The housing 200 has a hinge 210 to keep the two halves 202 and 204 together so that the split core 100 can be operated in the open or closed position as shown in FIGS. 4a to 5 b. The housing 200 also has a latching mechanism to keep the two halves 202, 204 in a locked position when the split core 100 is operated in the closed position. The latching mechanism comprises a hook 222 on the first half 202 to be engaged with a counterpart 224 of the second part 204, for example. As shown, the hinge 210 is mechanically engaged with the control assembly 190 so as to allow the mechanical tool 194 to cause the split core parts 110, 120 to open or to close. [0048] Although the invention has been described with respect to a preferred embodiment thereof, it will be understood by those skilled in the art that the foregoing and various other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention. Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS4048605 *Apr 5, 1976Sep 13, 1977Sangamo Electric CompanySplit core current transformer having an interleaved joint and hinge structureUS4263549 *Oct 12, 1979Apr 21, 1981Corcom, Inc.Apparatus for determining differential mode and common mode noiseUS4309655 *Jun 23, 1978Jan 5, 1982Lgz Landis & Gyr Zug AgMeasuring transformerUS4378525 *Sep 18, 1980Mar 29, 1983Burdick Neal MMethod and apparatus for measuring a DC current in a wire without making a direct connection to the wireUS4390813 *Jun 29, 1981Jun 28, 1983Litek International Inc.Transformer for driving Class D amplifierUS4559496 *Jun 4, 1984Dec 17, 1985General Electric CompanyLCD Hook-on digital ammeterUS4707619 *Feb 13, 1985Nov 17, 1987Maxwell Laboratories, Inc.Saturable inductor switch and pulse compression power supply employing the switchUS4851803 *Jul 25, 1988Jul 25, 1989E-Mon CorporationSplit core insulator and locking deviceUS5426360 *Feb 17, 1994Jun 20, 1995Niagara Mohawk Power CorporationSecondary electrical power line parameter monitoring apparatus and systemUS5793196 *Jul 3, 1996Aug 11, 1998Sundstrand CorporationCurrent transformer for measuring differential-mode and common-mode currentUS6426632 *Apr 28, 2000Jul 30, 2002George A. SpencerMethod and apparatus for testing an AFCI/GFCI circuit breaker* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS7091849May 6, 2004Aug 15, 2006At&T Corp.Inbound interference reduction in a broadband powerline systemUS7145440Oct 12, 2004Dec 5, 2006At&T Corp.Broadband coupler technique for electrical connection to power linesUS7172119Apr 30, 2004Feb 6, 2007Hall Donald RModular architecture sensing and computing platformUS7312694Mar 15, 2004Dec 25, 2007Ameren CorporationCapacitive couplers and methods for communicating data over an electrical power delivery systemUS7453353May 3, 2006Nov 18, 2008At&T Intellectual Property Ii, L.P.Inbound interference reduction in a broadband powerline systemUS7490769Feb 2, 2007Feb 17, 2009Hall Donald RModular architecture sensing and computing platformUS7701325Jun 15, 2007Apr 20, 2010Current Technologies, LlcPower line communication apparatus and method of using the sameUS7773361May 31, 2007Aug 10, 2010Current Grid, LlcMedium voltage signal coupling structure for last leg power grid high-speed data networkUS7795994Jun 26, 2007Sep 14, 2010Current Technologies, LlcPower line coupling device and methodUS7835128 *Jan 30, 2006Nov 16, 2010Georgia Tech Research CorporationSystems and methods for distributed series compensation of power lines using passive devicesUS7852837Dec 17, 2004Dec 14, 2010At&T Intellectual Property Ii, L.P.Wi-Fi/BPL dual mode repeaters for power line networksUS7876174Jan 18, 2008Jan 25, 2011Current Technologies, LlcPower line coupling device and methodUS7931198Feb 2, 2007Apr 26, 2011Hall Donald RModular architecture sensing and computing platformUS8072308 *Feb 26, 2007Dec 6, 2011General Electric CompanyHigh voltage transformer and a novel arrangement/method for hid automotive headlampsUS8115475Sep 23, 2009Feb 14, 2012Electrical Reliability Services, Inc.Manipulation assembly for online electrical system test probe installationUS8325455Apr 29, 2011Dec 4, 2012Georgia Tech Research CorporationVoltage surge and overvoltage protection with RC snubber current limiterUS8335067Apr 29, 2011Dec 18, 2012Georgia Tech Research CorporationVoltage surge and overvoltage protection with sequenced component switchingUS8335068Apr 29, 2011Dec 18, 2012Georgia Tech Research CorporationVoltage surge and overvoltage protection using prestored voltage-time profilesUS8411403Apr 29, 2011Apr 2, 2013Georgia Tech Research CorporationVoltage surge and overvoltage protection with current surge protectionUS8462902Aug 11, 2005Jun 11, 2013At&T Intellectual Property Ii, L.P.Interference control in a broadband powerline communication systemUS8488285Sep 12, 2011Jul 16, 2013Georgia Tech Research CorporationActive current surge limiters with watchdog circuitUS8582262Sep 12, 2011Nov 12, 2013Georgia Tech Research CorporationActive current surge limiters with disturbance sensor and multistage current limitingUS8587913Sep 12, 2011Nov 19, 2013Georgia Tech Research CorporationActive current surge limiters with voltage detector and relayUS8593776Nov 16, 2012Nov 26, 2013Georgia Tech Research CorporationVoltage surge and overvoltage protection using prestored voltage-time profilesUS8643989Sep 12, 2011Feb 4, 2014Georgia Tech Research CorporationActive current surge limiters with inrush current anticipationUS8711711Apr 19, 2011Apr 29, 2014Howard UniversitySystem and method of detecting and locating intermittent and other faultsUS8736252Dec 15, 2011May 27, 2014Electrical Reliability Services, Inc.Manipulation assembly for online electrical system test probe installationUS8766481Oct 14, 2011Jul 1, 2014Georgia Tech Research CorporationReduction of inrush current due to voltage sags with switch and shunt resistanceUS8804797May 10, 2013Aug 12, 2014At&T Intellectual Property Ii, L.P.Interference control in a broadband powerline communication systemUS8897635 *May 12, 2009Nov 25, 2014Howard UniversitySystem and method of detecting and locating intermittent and other faultsUS8938021May 6, 2004Jan 20, 2015Paul Shala HenryOutbound interference reduction in a broadband powerline systemUS9048654Oct 17, 2011Jun 2, 2015Georgia Tech Research CorporationReduction of inrush current due to voltage sags by impedance removal timingUS9065266Oct 14, 2011Jun 23, 2015Georgia Tech Research CorporationReduction of inrush current due to voltage sags by an isolating current limiterUS9071048Nov 5, 2013Jun 30, 2015Georgia Tech Research CorporationVoltage surge and overvoltage protection by distributed clamping device dissipationUS9172429Mar 7, 2005Oct 27, 2015At&T Intellectual Property Ii, L.P.Interference control in a broadband powerline communication systemUS9215045Jan 23, 2012Dec 15, 2015Howard UniversitySystem and method of detecting and locating intermittent electrical faults in electrical systemsUS9270170Apr 18, 2012Feb 23, 2016Innovolt, Inc.Voltage sag corrector using a variable duty cycle boost converterUS9299524Dec 30, 2011Mar 29, 2016Innovolt, Inc.Line cord with a ride-through functionality for momentary disturbancesUS9423443Apr 25, 2014Aug 23, 2016Howard UniversitySystem and method of detecting and locating intermittent and other faultsUS9577706Nov 24, 2014Feb 21, 2017At&T Intellectual Property Ii, L.P.Outbound interference reduction in a broadband powerline systemUS20040200900 *Apr 30, 2004Oct 14, 2004Hall Donald R.Modular architecture sensing and computing platformUS20050275495 *Aug 8, 2005Dec 15, 2005Pridmore Charles F JrPower line coupling device and method of using the sameUS20060082219 *Oct 12, 2004Apr 20, 2006At&T Corp.Broadband coupler technique for electrical connection to power linesUS20060114925 *Mar 7, 2005Jun 1, 2006At&T Corp.Interference control in a broadband powerline communication systemUS20070131756 *Feb 2, 2007Jun 14, 2007Hall Donald RModular architecture sensing and computing platformUS20070138275 *Feb 2, 2007Jun 21, 2007Hall Donald RModular architecture sensing and computing platformUS20080204180 *Feb 26, 2007Aug 28, 2008Tony AboumradHigh voltage transformer and a novel arrangement/method for hid automotive headlampsUS20080310069 *Jan 30, 2006Dec 18, 2008Deepakraj Malhar DivanSystems and Methods for Distributed Series Compensation of Power Lines Using Passive DevicesUS20100111521 *May 12, 2009May 6, 2010Howard UniversitySystem and Method of Detecting and Locating Intermittent and Other FaultsUS20110068773 *Sep 23, 2009Mar 24, 2011Electrical Reliability Services, Inc.Manipulation assembly for online electrical system test probe installationUS20110205675 *Apr 29, 2011Aug 25, 2011Georgia Tech Research CorporationVoltage surge and overvoltage protectionUS20110205676 *Apr 29, 2011Aug 25, 2011Georgia Tech Research CorporationVoltage surge and overvoltage protectionUS20110216457 *Apr 29, 2011Sep 8, 2011Georgia Tech Research CorporationVoltage surge and overvoltage protectionUS20160054376 *May 15, 2015Feb 25, 2016Mitsubishi Electric CorporationWiring core structure, semiconductor evaluation device and semiconductor deviceCN102222559A *Apr 13, 2010Oct 19, 2011徐其信Split current mutual inductorWO2006083739A1 *Jan 30, 2006Aug 10, 2006Georgia Tech Research CorporationSystems and methods for distributed series compensation of power lines using passive devicesWO2016125065A1 *Feb 1, 2016Aug 11, 2016Electrical Grid Monitoring Ltd.Device and method for releasing a magnetic core mounted around a current carrying electric conductor* Cited by examinerClassifications U.S. Classification336/178International ClassificationH01F38/30, H01F17/06Cooperative ClassificationH01F38/30, H01F17/062European ClassificationH01F38/30Legal EventsDateCodeEventDescriptionNov 12, 2002ASAssignmentOwner name: AMPERION, INC., MASSACHUSETTSFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:PERKINSON, JOSEPH C.;BROWN, SCOTT D.;REEL/FRAME:013499/0852Effective date: 20021107Jan 7, 2008REMIMaintenance fee reminder mailedJun 19, 2008FPAYFee paymentYear of fee payment: 4Jun 19, 2008SULPSurcharge for late paymentFeb 13, 2012REMIMaintenance fee reminder mailedJun 28, 2012SULPSurcharge for late paymentYear of fee payment: 7Jun 28, 2012FPAYFee paymentYear of fee payment: 8Feb 5, 2016REMIMaintenance fee reminder mailedJun 29, 2016LAPSLapse for failure to pay maintenance feesAug 16, 2016FPExpired due to failure to pay maintenance feeEffective date: 20160629RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services