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| Number | Title | Issue Date |
| 7525297 | Current transformer with impedance compensation and associated methods An impedance-compensated current transformer comprising a primary winding, a power source electrically coupled through the primary winding; a secondary winding magnetically coupled to the first primary winding, the secondary winding having a secondary winding impeda... | 04/28/2009 |
| 7256574 | Device for measuring electric current intensity A magnetic field generated by a primary winding (1) in which the current (i1) to be measured flows is balanced by a magnetic field of opposing direction generated by a secondary winding (2) in which a compensating current (i2) flo... | 08/14/2007 |
| 7251570 | Data integrity in a mesh network Systems and methods for ensuring data integrity in a mesh network. A mesh network can include multiple RF devices. Transmitting quality data in or on the mesh network is improved using communication validation functions. The communication validation functions ensure... | 07/31/2007 |
| 7242157 | Switched-voltage control of the magnetization of current transforms and other magnetic bodies The magnetic flux of a magnetic body is controlled with voltage pulses from an active voltage source. The voltage pulses are applied to a winding circuit which is magnetically coupled to the magnetic body. An electronic switch means is used to generate the voltage p... | 07/10/2007 |
| 7242197 | Current measuring apparatus, test apparatus, and coaxial cable and assembled cable for the apparatuses There is provided a current measuring apparatus for measuring current-under-measurement flowing between a first measuring terminal and a second measuring terminal, having a plurality of primary coils whose one end is electrically connected with the first measuring t... | 07/10/2007 |
| 7221166 | Fault location using measurements from two ends of a line The present invention relates to a method to locate a fault in a section of a transmission line using measurements of current, voltage and angles between the phases at a first (A) and a second (B) end of said section. The invention is characterised by the steps of, ... | 05/22/2007 |
| 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 |
| 7174143 | Receiver circuit with transmission loss compensation Transmission loss compensation is provided for receiver circuits in general, including an ATE receiver circuit having a voltage-to-current converter, such as a transconductance amplifier, that receives a distorted DUT signal and provides an output to a current-to-vo... | 02/06/2007 |
| 7145321 | Current sensor with magnetic toroid A current sensor for sensing current in a primary source, including a primary conductor forming at least one winding on a first portion of a toroid formed from a magnetic material. A secondary source of electrical current from a signal forms a plurality of winding o... | 12/05/2006 |
| 7127364 | Method of compensating for distorted secondary current of current transformer Disclosed herein is a method of compensating for the distorted secondary/ current of a current transformer. The method includes steps (a), (b) and (c). At step (a), the saturated section of the current transformer is detected. At step (b), fault current generated du... | 10/24/2006 |
| 7103485 | Method for compensating secondary current of current transformers A method for preventing the unwanted maloperation of a protective relay system that is caused by the imprecise detection of an actual secondary current value resulting from a measured secondary current being distorted comprises the steps of calculating difference va... | 09/05/2006 |
| 7079773 | Power feeding for an optical transmission system A method and an apparatus for optical transmission line power feed interference compensation for compensating for an electrical interference signal in a power feed conductor (12; 52) and in an associated second conductor (14; 54). The interference sign... | 07/18/2006 |
| 7048809 | Magnetic implement having a linear BH loop Magnetic powder having a large coercivity, Hc, is consolidated with a non-magnetic binder to form a magnetic implement having desired dimension and shape. The magnetic implement exhibits a linear B-H loop and low magnetic loss. It is capable of operating ... | 05/23/2006 |
| 6604055 | System and method for AC line voltage analysis A system and method for AC line voltage analysis is disclosed. According to one embodiment of the present invention, a system for AC line voltage analysis on an AC line includes a transformer that steps down the AC line voltage, a rectifier that rectifies... | 08/05/2003 |
| 6590380 | Method and apparatus for compensation of current transformer error The exciting current of a current transformer is calculated and added to the measured secondary current to produce a corrected signal. The exciting current is calculated by first calculating the current transformer induced voltage. The induced voltage is ... | 07/08/2003 |
| 6479976 | Method and apparatus for accurate measurement of pulsed electric currents utilizing ordinary current transformers A voltage source connected in the secondary circuit of a current transformer is controlled so as to provide a secondary current that is accurately and continuously proportional to a primary current that is either pulsed d-c electric current or pulsed a-c ... | 11/12/2002 |
| 6177791 | Current sensor according to the compensation principle Current sensor according to the compensation principle, in which the magnetic field produced by a primary winding (1) through which the current to be measured flows is compensated by the compensation current in a secondary winding (6), and in which for th... | 01/23/2001 |
| 6028422 | Current transformer A current transformer for mains alternating current with dc components is formed of at least one transformer core with a primary winding and at least one secondary winding, of load resistor is connected in parallel to the secondary winding and terminates ... | 02/22/2000 |
| 5896027 | Current ratio device for use in forming a current transformer A current ratio device for use in forming a hand-held openable-core clamp-on type of current transformer. The device employs electronically-aided three-stage circuitry for forming a current transformer capable of accurate low current measurements over a w... | 04/20/1999 |
| 5453681 | Current sensor employing a mutually inductive current sensing scheme An alternating current sensor employing a mutually-inductive current sensing scheme comprises a conductive pipe and a cylindrical-shaped conductive element at least partially surrounded by the pipe. The pipe is substantially concentric to the conductive e... | 09/26/1995 |
| 5432439 | Arrangement in a current detection circuit The present invention relates to an arrangement in a current detection circuit. There is a primary coil for the current to be detected, a separate transformer core which is influenced by the current of the primary coil, a secondary coil conducting a trans... | 07/11/1995 |
| 5369355 | Compensation circuit for transformer linearization Method and apparatus for linearizing the performance of electrical transformers using negative feedback. Two circuits are disclosed which use an operational amplifier to compensate a three-winding transformer, yielding an improved low-end frequency respon... | 11/29/1994 |
| 5307008 | Current ratio device and toroidal core assembly therefor A current ratio device is used for forming a current transformer that can accurately scale down high currents to usable metering levels. The transformer has associated circuitry that renders it capable of functioning not only with ac and a mixture of ac a... | 04/26/1994 |
| 5276394 | Compensated transformers A transformer having a primary winding and a secondary winding across which load is coupled is compensated. A third winding is provided on the transformer. A first output terminal of an amplifier is coupled to a first terminal of the primary winding. A fi... | 01/04/1994 |
| 5252911 | AC to DC power converter with regulated bi-polar outputs A AC to DC power converter unit includes an AC/DC converter section operable to convert an AC input into a plurality of unregulated internal DC outputs and a pair of positive and negative switching DC/DC converter sections connected to said AC/DC converte... | 10/12/1993 |
| 5150270 | Transformer circuit and method with saturation prevention The disclosure is directed to a transformer circuit apparatus which receives an input signal and generates an output signal representative of the input signal. For example, the input signal may be an AC current, and the output signal to be generated may b... | 09/22/1992 |
| 5093770 | Electrical energy storage system A circuit arrangement for providing a store of energy for actuating an electrically operable device, incorporating a reservoir capacitor, comprising a transformer having low resistance windings, the primary winding of which is connectable to an alternatin... | 03/03/1992 |
| 5066904 | Coaxial current sensors A sensor for measuring large magnitudes of A.C. current utilizes a current divider having parallel conductors and a current comparator coupled to one of the conductors so arranged as to perform first and second stages of scaling of the A.C. current to obt... | 11/19/1991 |
| 5051687 | Transimpedance circuit A transimpedance circuit for generating an output voltage replica of an alternating current input has its accuracy improved by the use of a current comparator, the ratio windings of the comparator respectively carrying a current proportional to the input ... | 09/24/1991 |
| 5008612 | Current sensor A current sensing apparatus includes a first transformer having a core which is cyclically driven into forward and reverse saturation, and a second transformer having a separate core. The sensing apparatus includes circuitry for separating the sensed curr... | 04/16/1991 |
| 4967145 | Active current transformer An active current transformer has a primary conductor in which a current is to be measured and a secondary conductor in which a measuring current is generated in use. A feedback sensor provides an induced voltage and an amplifier receives a signal induced... | 10/30/1990 |
| 4904925 | Apparatus for recovering an alternating variable of a controlled semiconductor An apparatus for recovering an alternating variable having a direct current component in a controlled semiconductor component includes an electromagnetic transducer for measurement having a secondary winding. A sample and hold element has a trigger input,... | 02/27/1990 |
| 4857827 | Electronic load for testing transformers An adjustable electronic load for testing current transformers and/or voltage transformers, the load having connected, between its input current terminals, a series connection including the input of a current-to-voltage converter and the output of a contr... | 08/15/1989 |
| 4801937 | Line mounted apparatus for remote measurement of power system or environmental parameters beyond line-of-site distanc A remote sensing and communications system for installation on energized high voltage conductors is disclosed herein. The sensor modules are capable of measuring electrical, mechanical or environmental parameters in the vicinity of a high voltage conducto... | 01/31/1989 |
| 4698740 | Current fed regulated voltage supply The invention is a locally isolated regulated power supply providing a regulated dc power output from an ac current source having a large dynamic range. The power supply comprises an ac-to-dc converter for providing a rectified dc output from an ac curren... | 10/06/1987 |
| 4682101 | Current transformer for direct and alternating current Two ferromagnetic cores (11, 12) are provided for a transformer, only one of the cores (11) exhibits an air gap (13) in which a Hall effect element (3) is housed. The current flowing in a conductor (10) can be direct or alternating current and induces in ... | 07/21/1987 |
| 4652810 | Subminiature current transformer In conventional subminiature current transformers, voltage withstandability property is not reliable and frequency characteristics are inferior. The current transformer of the invention, advantageously, is able to withstand high voltages and also has othe... | 03/24/1987 |
| 4635055 | Apparatus for measuring the temperature and other parameters of an electic power conductor A self contained hot stick mounted radio transmitting module may be temporarily pushed against the power conductor of an electrical transmission line. The module is capable of measuring the temperature of the conductor, and the temperature of the ambient ... | 01/06/1987 |
| 4629974 | Active current transformer A current transformer equipped with a primary winding (1), a secondary winding (2), as well as a detector winding (3), has a rigid coupling between the secondary winding (2) and the detector winding (3). The coupling factor between these windings (2, 3) a... | 12/16/1986 |
| 4492919 | Current sensors A sensor for measuring large magnitudes of A.C. current utilizes a conductive member having a higher-resistance element parallelled by a pair of elements with lower, and substantially equal, resistance and so arranged as to cause cancellation of magnetic ... | 01/08/1985 |
