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4899103 |
Current meter
A variable electrical current in a first winding on a magnetizable core produces a magnetomotive force in the core. A second core winding produces an opposing magnetomotive force digitally...
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4897600 |
High frequency ammeter
A current detector for detecting the high frequency current flowing in a conductor includes a coil of high resistivity material wound around an non-ferromagnetic core. The coil is arranged in a...
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4896105 |
AC electric energy meter having drive circuit including stepper motor for driving mechanical register
An AC electric energy meter is coupled to a source of AC electrical energy and to an AC load. A sensing circuit senses the amount of AC electric energy consumed by the AC electric load. An AC...
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4894610 |
Current-transformer arrangement for an electrostatic meter
The invention is concerned with a current-transformer arrangement for a static electricity meter, including a primary conductor carrying the alternating current to be measured and a secondary...
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4891580 |
Electro-optic measurements of voltage waveforms on electrical conductors
The longitudinal electro-optic effect is used with an external probe to make voltage measurements on electrical conductors.
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4887027 |
Leadless current-sensing system
A leadless current-sensing device for sensing current flowing in a conductor when the device is positioned in the vicinity of the current-carrying conductor. The device has a probe having a set of...
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4876503 |
Method of measuring the intensity of a DC current and a device implementing this method
A method of measuring the strength of a DC current and a device for implementing this method are provided, forming an NMR shunt for measuring high currents. A magnetic coil is placed in series in...
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4864222 |
Voltage detector employing electro-optic material having a corner-cube shape
In a voltage detector using an electro-optic material whose refractive index is changed by a voltage developing in a selected area of an object under test, an end portion of the electro-optic...
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4857837 |
Magneto resistive current sensor with improved fidelity
The present invention is a current sensor employing a magneto resistive sensor having high fidelity of output. This current sensor includes a magnetic flux concentrator substantially encircling the...
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4855671 |
Electrical power line and substation monitoring apparatus
Disclosed herein are individual sensor modules for mounting directly upon energized electrical power conductors and systems employing such modules, with principal emphasis upon the provision of...
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4853620 |
Circuit arrangement comprising multiplier circuits to find the sum of electrical power outputs for application in multi-phase electricity meters
A circuit arrangement for finding a sum of electrical power outputs for use in a multi-phase electricity meter is disclosed. The circuit arrangement comprises a plurality of multiplier circuits...
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4851763 |
Current-measuring device, especially for determining the motor current of a direct-current motor
Current-measuring device including a non-contacting current sensor and an evaluating device connected downstream to the sensor for producing an output signal proportional to a current being...
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4841235 |
MRS current sensor
A current sensor (10) comprising spaced pole pieces (62, 64) and a magnetic shunt (80) bridging the pole pieces within an insulating housing assembly (12) which also contains a magnetoresistive...
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4841237 |
Current-measuring device
A current-measuring device in accordance with the invention comprises an annular magnetic circuit having separate first and second magnetic circuit portions (1, 2) with ends suitable for coming...
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4841236 |
Current ratio device
A current ratio device for use in constructing a current transformer comprises a first magnetic core, a second magnetic core, a measuring winding electromagnetically coupled with the first core but...
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4839600 |
Ammeter for use with A.C. electric power lines
The invention provides an ammeter specially suited for measuring the currents passing in high voltage, high power A.C. lines and, when required, storage of the resultant information, together with...
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4825154 |
Current probe
A current probe is provided which comprises a handle and a ring of magnetisable material for positioning around an electrical conductor, the ring being split into two portions one being fixed...
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4823074 |
Low power consumption current transducer
A low power consumption current transducer utilizes a saturable core reactor which includes a pair of opposed gate windings and a control winding. The control winding of the saturable reactor is...
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4823075 |
Current sensor using hall-effect device with feedback
A current sensor for use with a conductor with known cross-sectional characteristics is an electronic circuit having a monolithic Hall-effect element disposed substantially perpendicular to the...
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4799005 |
Electrical power line parameter measurement apparatus and systems, including compact, line-mounted modules
The disclosed invention is primarily directed to sensor modules for mounting directly upon energized electrical power lines to monitor parameters associated with operation thereof, wherein the...
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4797607 |
Method of updating the scale factor of apparatus for measuring an alternating electric current by means of the faraday effect
The method is intended for use in a step-down high tension current measuring apparatus using the Faraday effect and including a Sagnac interferometer having an optical loop constituted by a fiber...
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4794328 |
Tool for mounting a sensor module on a live power transmission line
A "hot-stick" mountable sensor module for attachment and removable from a live power transmission line. A tool is insertable into a mounted module to attach the module to the tool and permit...
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4794326 |
Transducer for current measurements
A transducer for current measurements includes a flat conductor with at least two main current branches for the current to be measured and at least a cross-branch current bridge connecting two...
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4791361 |
Current sensor for universal application
A magnetic flux concentrator comprising spaced pole pieces (4,6) and magnetic shunt (8) bridging the pole pieces within an insulating housing (2) which also contains a magnetoresistive transducer...
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4768215 |
X-ray generator with current measuring device
An X-ray generator with current measuring device has an X-ray tube, a power supply unit for feeding high voltage to the X-ray tube, a high voltage cable for connecting the X-ray tube and power...
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4754218 |
Current sensing apparatus
A current sensing apparatus suitable for sensing the amount of current flowing in a power feeder cable without the necessity for any ohmic connection between the meter and the circuit being...
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4754219 |
Low cost self-contained transformerless solid state electronic watthour meter having thin film ferromagnetic current sensor
A transformerless, self-contained, low cost, small size, light weight solid state electronic watthour meter is described which employs thin film ferromagnetic current sensors of the type which are...
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4749940 |
Folded bar current sensor
A current sensor employs a folded conductor bar having aligned holes therein to generate magnetic fluxes in the holes proportional to a current flowing in the bar. Each of the two holes has two...
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4742294 |
Helix current sense system
A magnetic sensor for measuring the helix current of a traveling wave tube (TWT). The sensor includes a helix current sense inductor and a reference inductor. The sense inductor includes windings...
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4742296 |
Arrangement for measuring electrical power
The present invention is an arrangement for measuring electrical power. The arrangement comprises a conductor traversed by an electrical current i and a voltage-to-current converter for...
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4683421 |
Drift compensation technique for a magneto-optic current sensor
Drift compensation for the output signal of a magneto-optic current measuring system is achieved through the use of two light emitting sources, each at different frequencies, to generate two...
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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...
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4682100 |
Method of measuring a DC current or a low-frequency AC current
Measuring a DC or a low frequency AC current by feeding the current to be measured through the primary winding of a transformer, whereby a first flux is generated in the transformer and generating...
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4677380 |
Magnetic field sensor comprising two component layer transistor of opposite polarities
A magnetic field sensor having two component layer transistors of opposite polarities are cross connected together and give a higher degree of sensitivity, by virtue of that feedback effect. The...
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4626777 |
D.C. current transformer circuits
A D.C. current transformer (used for measuring D.C.) comprising a common primary winding and a pair of saturable magnetic cores on which respective secondary windings are wound and connected in...
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4616174 |
Detector circuit for current measurements
The measurement of large DC and AC currents, are measured by a zero-flux current transformer. Two identically wound toroidal cores in which the magnetic flux induced by a primary current is...
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4596950 |
Compensated transducer
A compensated measurement transducer for measuring a first current generates a first magnetic field of a predetermined direction which flows in a first circuit including a first conductor; a second...
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4587486 |
Switch for detecting a magnetic field
A magnetic-field-dependent inductive proximity switch having a coil arrangement with a ferromagnetic core, which is saturation-sensitive with respect to the magnetic field to be picked up, and...
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4559495 |
Transducer free of any magnetic core for contactless current measurement
A transducer free of any magnetic core for contactless measurement of a current includes an electrically conducting strip adapted to carry the current in a predetermined direction. The current thus...
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4542338 |
Optical fibre interferometric electric current measuring device
Optical fibre interferometer for measuring a current carried by a high voltage line of the type comprising a winding traversed by a feedback current, having at least one base at earth potential,...
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4540937 |
Electronic circuitry with self-calibrating feedback for use with an optical current sensor
There is provided by this invention an electronic circuit for interfacing with a magneto-optical current sensor employing the Faraday effect to measure current in a high voltage transmission line....
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4539519 |
Fiber optics device for measuring the intensity of an electric current utilizing the Faraday effect
In order to measure the intensity of an electric current utilizing the Faay effect, an optical path which is exposed to a magnetic field generated by the current is marked by an optical fiber which...
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4536706 |
Magnetic current sensor
A mechanized system distributing the access, test and communication functions to the point of testing, typically the centralized switching facility serving the telephone loops and equipment to be...
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4529931 |
Single-coil current measuring circuit
A single-coil wound on a ferrite core surrounding a current path is driven from a voltage controlled constant current source. The coil drive current is modulated with a fixed frequency squarewave....
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4528502 |
Current sensor
A current sensor, integratable with power switching and control circuitry on a common substrate and insulatable from current-carrying conductors, utilizes a piezoelectric element located between a...
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4525668 |
System for measuring electrical output or energy
In an apparatus for the measurement of electrical power, including a multiplier which receives on an input thereof an electrical signal proportional to the voltage component of the electrical...
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4520311 |
Current to pulse-sequence transducer
A current to pulse-sequence transducer for transforming a current to be measured into a sequence of pulses which has a certain mark-to-space ratio, includes a first transforming device for...
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4517513 |
Magnetic differential current sensor
A mechanized system distributing the access, test and communication functions to the point of testing, typically the centralized switching facility serving the telephone loops and equipment to be...
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4516070 |
Magnetic current sensor with offset and load correction
A mechanized system distributing the access, test and communication functions to the point of testing, typically the centralized switching facility serving the telephone loops and equipment to be...
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4513246 |
Clamp-on ammeter
A clamp-on ammeter for measuring current flows in a conductor is described. The ammeter is of a type comprising a magnetic core which can be located about a conductor and an indicator which...
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