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| Number | Title | Issue Date |
| 7960977 | Determining degraded insulating ability in insulation provided between two objects of an inductively operating element A method, device and computer program product for determining the change in insulating ability of the insulation provided between two objects of an inductively operating element, where at least one of the objects is a winding. The device includes an analyzing unit, ... | 06/14/2011 |
| 7812615 | Method and device for fault detection in transformers or power lines A method for fault detection in a power transformer/autotransformer and/or interconnected power lines, which are within the zone protected by the differential protection, and particularly suitable for detecting turn-to-turn faults in power transformer/autotransforme... | 10/12/2010 |
| 7330033 | Noncontact sensor A noncontact voltage sensor is housed in a container comprising a container body having an opening on one side and an insulation cover body for sealing the opening. A plate type electrode insulated from a ground is housed in the container. The cover body side is opp... | 02/12/2008 |
| 7292048 | Method and apparatus for measuring a dielectric response of an electrical insulating system Method and device for measuring a dielectric response of an electrical insulating system, wherein a first measurement result is determined by a frequency domain method and a second measurement result is determined by a time domain method, whereupon the first measure... | 11/06/2007 |
| 7288718 | Separable electrical connector component for sending and receiving communication signals through underground power distribution lines An electrical connector component for sending and receiving communication signals through a power distribution line generally includes an internal conductor, an insulative housing surrounding the conductor and a signal filtering device having a medium-voltage end in... | 10/30/2007 |
| 7279905 | Method and an apparatus for supervising the operation of current transformers A method of supervising the operation of a plurality of current transformers arranged in respective groups and connected to a protection relay forming part of a three-phase electrical power system includes determining a current ratio at an output of each group of cu... | 10/09/2007 |
| 7242291 | Arc fault circuit interrupter test circuit and test board A tester for an arc fault circuit interrupter that can selectively simulate and apply electrical arc faults and nuisance loads to at least one device under test (DUT). The tester includes a power supply, a test controller, and test circuitry coupleable to a DUT. AC ... | 07/10/2007 |
| 7239127 | Apparatus and method for inspecting electronic circuits The present invention provides an apparatus and a method for used in a board inspection capable of an inspection of defect in a circuit board with high resolution over a wide range. The method is used for manufacturing a sensor probe comprising layers which include ... | 07/03/2007 |
| 7227367 | Current transformer test device and method A current transformer test method implemented using a test device, is useful to verify proper CT installation and operation, and does not rely on the generator (or other system) to be in a state of relatively high assembly. The test device allows a current transform... | 06/05/2007 |
| 7212005 | Ignition coil tester The present invention relates to an ignition coil tester having a control module and an output electronics for testing the functioning of rod-type ignition coils, which is connectible to a diagnostic tester, the rod-type ignition coil having a primary winding and a ... | 05/01/2007 |
| 7196884 | Apparatus and method for detecting the loss of a current transformer connection coupling a current differential relay to an element of a power system Disclosed is an apparatus and method for detecting a loss of a current transformer connection coupling a protective relay to a power system element of a three-phase power system and providing a plurality of secondary current waveforms of the three-phase power system... | 03/27/2007 |
| 7193827 | Single-sensor microcontroller-based approach for ground fault circuit interrupters A microcontroller-based temperature compensated circuit for ground-fault circuit interrupter to meet the requirements of UL 943 using a single sensor to detect both ground-fault and grounded-neutral fault conditions in both full-wave and half-wave AC power supplies ... | 03/20/2007 |
| 7183776 | System and method for performing online partial discharge testing A partial discharge sensing system and method for conducting testing inside an enclosure includes a partial discharge sensor, an access port, and a signal cable. The partial discharge sensor is permanently installed at a test location inside the enclosure. The acces... | 02/27/2007 |
| 7174261 | Power line sensors and systems incorporating same An apparatus for sensing the current in a power line of a power system and systems incorporating the apparatus are disclosed. The apparatus may comprise an enclosure providing a window operable to permit the passage of the power line therethrough. The apparatus may ... | 02/06/2007 |
| 7167007 | Apparatus and method for field testing MOV arresters Embodiments test MOV arresters. One embodiment comprises applying a plurality of voltages to a high voltage lead of the MOV arrester, the plurality of voltages being changed between an initial test voltage and final test voltage (corresponding to a point of conducti... | 01/23/2007 |
| 7161873 | Method of detecting and locating a source of partial discharge in an electrical apparatus A method of detecting and localizing a source of partial discharge in an electrical apparatus placed in an enclosure containing an acoustically-conductive fluid. The method consists in: positioning (31) acoustic detectors an... | 01/09/2007 |
| 7157710 | Corona discharge detection An apparatus and process are provided for detecting whether a corona discharge has occurred external or internal to equipment in which a broadband optical spectra sensor is placed. The broadband optical spectra sensor senses both the ultraviolet energy of the corona... | 01/02/2007 |
| 7148679 | Transformer probe A probe (10) for sensing movement of a body of magnetic material comprises a magnetically energisable pole piece (30), a closed loop electrical circuit (20) having a first end (25) which is wound around the pole piece (30) and form... | 12/12/2006 |
| 7145345 | Current transformers for partial discharge detection on aircraft cables and wires A technique for detecting defects in aircraft wiring, such as for detecting partial discharges or arcing in wiring or cables is disclosed. A high frequency current transformer (HFCT) is fixingly positioned in contact with a wire so that the wire is encircled by the ... | 12/05/2006 |
| 7126344 | Diagnostic device for an antenna A diagnostic device for an antenna includes a coil (20) or the like connected on the one hand to a reference potential and on the other hand to the output of an amplifier (12), including two condensers (C2, C3) mounted in series, a first ... | 10/24/2006 |
| 7119548 | Current transformer test device and method A current transformer test device and a method implemented using the test device, is useful to verify proper CT installation and operation, and does not rely on the generator (or other system) to be in a state of relatively high assembly. The test device allows a cu... | 10/10/2006 |
| 7112968 | Method and apparatus for detecting a partial discharge in a high-voltage transmission and distribution system A method and an apparatus for detecting a partial discharge in a high-voltage transmission and distribution system include detectors which are respectively attached to a power cable and an antenna, such that a first signal and a second signal at a predetermined freq... | 09/26/2006 |
| 7109877 | Fault monitoring apparatus and method A fault condition monitoring apparatus for use with a fuse cutout includes a housing operable to be supported by the fuse cutout. The housing has first and second contacts operable to make electrical contact with fuse contacts on the fuse cutout when the housing is ... | 09/19/2006 |
| 7107186 | Transformer testing A method for transformer testing includes receiving a failing test result of a transformer, the test result being determined from a test taken during transformer manufacture, determining, via a knowledge-based system, a predicted root cause of the failure based on t... | 09/12/2006 |
| 7106078 | Method and apparatus for measuring transformer winding resistance The present invention is a method of and an apparatus for measuring resistances of at least one transformer winding (109) in configurations of connected transformers windings. The method is based on increasing driving power from the source of electrical energ... | 09/12/2006 |
| 7102360 | Procedure to measure grounding resistances of electrical installations by measuring the loop impedance A procedure to measure the grounding resistances of electrical installations by measuring the loop impedance. According to this procedure, using voltage generator transformers, a current is injected into the loop and this current is measured using current measuremen... | 09/05/2006 |
| 7081757 | Re-locatable partial discharge transducer head An apparatus (10) for detecting the occurrence of partial discharge in electrical equipment, such as high voltage transformers. The apparatus comprises a detecting means including an ultrasonic transducer (11) mounted at one end of an electrically insu... | 07/25/2006 |
| 7071701 | Online fiber optic sensor for detecting partial discharge and similar events in large utility station transformers and the like An approved method and apparatus for detecting partial discharge events within a transformer comprises asserting a MEMS acoustical probe through the wall of the transformer to optically measure partial discharge events. In an enhanced embodiment, temperature compens... | 07/04/2006 |
| 7061142 | Inline power device detection According to one embodiment of the invention, a method for providing power to a device coupled to a communications switch through a data line is provided. The method includes determining that the device includes a diode. The method also includes providing power to t... | 06/13/2006 |
| 7056165 | Control system for outboard motor The control system establishes an engine warm-up protocol based, at least in part, on elapsed time from engine start. The control system provides a reduced reliance on engine temperature as a basis for determining an appropriate engine idle speed. The control system... | 06/06/2006 |
| 7042229 | System and method for on line monitoring of insulation condition for DC machines Insulation condition monitoring systems and methods for a rotating DC electric machine, the method comprising: measuring a first set of values for an instantaneous differential current and an instantaneous voltage during operation of the rotating DC electric machine... | 05/09/2006 |
| 7034547 | Method of diagnosing a fault on a transformer winding The present invention relates to a method of diagnosing a fault on a transformer winding by using frequency response analysis. The method comprises the steps of: measuring the impedance on said winding as a function of frequency, said measurement being represented i... | 04/25/2006 |
| 7030602 | Testing of current transformers A method for evaluating the accuracy of a current transformer is presented. The current transformer has a primary winding and a secondary winding. A current is not circulated through the primary winding. A load is disconnected from the current transformer. A load im... | 04/18/2006 |
| 7002356 | Current transformers for partial discharge detection on aircraft cables and wires A technique for detecting defects in aircraft wiring, such as for detecting partial discharges or arcing in wiring or cables is disclosed. A high frequency current transformer (HFCT) is fixingly positioned in contact with a wire so that the wire is encircled by the ... | 02/21/2006 |
| 6990415 | Evaluation circuit for a current sensor using the compensation principle, in particular for measuring direct and alternating currents, and a method for operating such a current sensor A current sensor using the compensation principle, in particular for measuring direct and alternating currents, includes an entirely digital evaluation circuit for signal processing. This substantially lowers the cost of the control electronics, in particular throug... | 01/24/2006 |
| 6987390 | Method for testing a transformer and corresponding test device Testing a transformer by applying to the transformer a test signal, the frequency of which may be lower than the nominal frequency of the transformer. The voltage of the test signal may also be lower than the nominal voltage of the transformer. A number of frequency... | 01/17/2006 |
| 6980005 | Circuit protection device with timed negative half-cycle self test The present invention is directed to an electrical wiring protection device for use in coupling an AC power distribution system to at least one electrical load. The device includes an automated self-test circuit coupled to the AC power distribution system. The autom... | 12/27/2005 |
| 6975312 | Computer system having network connector and method of checking connection state of network cable therefor A computer system having a network connector to which a network cable is connected, including a displaying part displaying a connection state of the network cable; a signal processing part processing a signal inputted through the network connector; and a control par... | 12/13/2005 |
| 6960928 | Electromagnetic coupling based motor plug detect system and method A method and system of detecting the presence of an electric machine attached to a solid state drive using high speed, low energy pulses. The system and method include generating a pulse signal to a selected driven phase winding; and detecting the pulse signal for t... | 11/01/2005 |
| 6954060 | a-c current transformer functional with a d-c current component present The magnetic core of an a-c current transformer is optimized so that the current transformer is able to function with a primary electric current having a d-c current component. In the preferred embodiment, the magnetic core is optimized to have nonlinear incremental... | 10/11/2005 |
