Matches 1 - 49 out of 49


Match Document Document Title
9000875 Apparatus and method for mounting an overhead device  
An apparatus is provided for securing to and collecting power from an electrical conductor including a wire clamp that clamps to and secures the apparatus to the electrical conductor, a current...
8901919 Compact, two stage, zero flux electronically compensated current or voltage transducer employing dual magnetic cores having substantially dissimilar magnetic characteristics  
A device for sensing electrical current or voltage in an electrical distribution system using an actively compensated current ratio transformer that includes a first magnetic core having a first...
8421444 Compact, two stage, zero flux electronically compensated current or voltage transducer employing dual magnetic cores having substantially dissimilar magnetic characteristics  
A device for sensing electrical current or voltage in an electrical distribution system using an actively compensated current ratio transformer that includes a first magnetic core having a first...
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...
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...
6727791 Capacitive voltage transformer  
A capacitive voltage transformers for distribution of the power from 10 kv high potential line, includes a insulating column with a high potential terminal, a ground terminal and capacitors C1 and...
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...
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...
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...
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...
6028422 Current transformer  
PCT No. PCT/DE98/00466 Sec. 371 Date Apr. 19, 1999 Sec. 102(e) Date Apr. 19, 1999 PCT Filed Feb. 17, 1998 PCT Pub. No. WO98/36432 PCT Pub. Date Aug. 20, 1998A current transformer for mains...
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...
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...
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...
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...
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...
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...
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...
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,...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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,...
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...
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...
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,...
4309652 Current transforming circuits  
Current transforming apparatus comprising a current transformer and means for developing a current substantially expressed by aI2, wherein I2 denotes the secondary current of the current...
4278940 Means for automatically compensating DC magnetization in a transformer  
Apparatus for providing automatic compensation of direct current magnetization of a current transformer in an alternating current watthour meter utilizing a magnetic field sensor and electronic...
4255705 Peak detection and electronic compensation of D. C. saturation magnetization in current transformers used in watt hour meter installations  
A watt hour meter installation is described which is of the type including an input transformer having an input winding for connection to an alternating current power supply line, an output...
4255704 Zero crossing detection and electronic compensation of D. C. saturation magnetization in current transformers used in watthour meter installations  
A watthour meter installation of the type including an input current transformer having an input winding for connection to an AC power supply line, an output winding for connection to a watthour...
4217620 Circuit for controlling induction in current transformers  
The present invention is directed to a circuit for controlling induction in current transformers so as to maintain such induction at a level below its saturation level in presence of a primary...
4198595 Apparatus and method of phase shift compensation of an active terminated current transformer  
Apparatus and method of compensating for a shift in the phase of the current applied to a current transformer terminated in a low impedance operational amplifier. The operational amplifier phase...
4182982 Current sensing transducer for power line current measurements  
A current sensing transducer includes a conductive current divider including a branch path for conducting a fractional current proportional to a current to be sensed and being applied through the...
4096363 Transmission network including flux compensation  
Magnetic flux generated in a core of a transformer employed in a transmission network by subscriber loop direct current is compensated by controllably generating a current to induce a magnetic...
4032837 Current transformer  
A current transformer comprising a tubular main insulator, a number of first windings arranged around the main insulator, and a number of second windings arranged inside the main insulator. The...
4007414 Current transducer arrangement  
A current transducer arrangement for detecting the magnitude and the polarity of a large current, wherein at least three current transducers and a majority circuit are comprised, each of the...
RE28851 Current transformer with active load termination  
A current transformer and transresistance amplifier are combined; the secondary winding of the current transformer being connected to the input of the transresistance amplifier and being virtually...
3848178 COMBINED POWER AND INSTRUMENT POTENTIAL TRANSFORMER  
A potential transformer having a low voltage metering winding and an auxiliary low voltage power winding on a single core with a common primary winding is provided with a current transformer in...
3815011 CURRENT TRANSFORMER TERMINATED BY ACTIVE LOAD ELEMENTS FOR PROVIDING PHASE-INVERTED SIGNALS  
The secondary winding of a current transformer is terminated in a virtual short-circuit condition by a pair of active load elements, such as transresistance amplifiers, which provide, for example,...
3815012 CURRENT TRANSFORMER WITH ACTIVE LOAD TERMINATION FOR PROVIDING, INTER ALIA, PHASE ANGLE ALTERATION  
The secondary winding of a current transformer is terminated in a virtual or near short circuit condition by an operational amplifier which has connected therewith. Circuit means, such as passive...
3534247 CURRENT TRANSFORMER WITH INTERNAL ERROR COMPENSATION  
3497793 ERROR COMPENSATION APPARATUS FOR INSTRUMENT TRANSFORMERS  
3089999 Bias for current transformer  

Matches 1 - 49 out of 49