Matches 451 - 500 out of 599 < 1 2 3 4 5 6 7 8 9 10 11 12 >
Match Document Document Title
4511839 Method and a system for analyzing the secondary current in a current transformer, the primary side of which is connected into a line of an electric energy supply network  
The invention relates to a method and a system for analyzing the secondary current (J 2 ) of a current transformer (20), the primary side of which is connected into a line (10) of an electric...
4504787 Electronic watthour meter  
An electric watthour meter for measuring AC power consumption is disclosed which includes a pair of parallel plate bus bars through which all of the power to be measured is conducted, a...
4500838 Current sensor  
A current sensor, responsive to the first power of a current to be measured, utilizes a piezoelectric element located between a current-carrying conductor and a permanent magnet having its...
4496932 Current divider for current measurement in conjunction with a measurement transducer  
A current divider for use in connection with a measurement transducer. The measurement transducer includes a magnetic core, is formed as a substantially flat and longitudinal conductor with two...
4482862 Current sensor  
A current measuring system includes three toroidal magnetic cores. The first core has a non-linear B-H characteristic and being adapted for operation in and between its saturation ranges of its B-H...
4464625 Magnetoresistive current detector  
In a magnetoresistive current detector, which includes a conductor carrying a current to be measured, which in turn generates an external magnetic field, four bridge elements are connected to one...
RE31613 Measuring transformer  
A measuring transformer comprises a measuring conductor carrying the current I m to be measured, a pre-magnetizing winding which carries a pre-magnetizing current I v , and a magnetic field...
4454553 D.C. Current detector  
A current detector comprising a current-pulse duty conversion element including a core of an amorphous, magnetically soft material having a first and a second coil disposed thereon. A current which...
4402034 Polarity sensitive solid state relay  
A polarity sensitive relay fabricated of and controlled by, solid state components is provided to produce a more trouble-free and smaller device. The relay may be made in first and second versions,...
4385273 Transducer for measuring a current-generated magnetic field  
A current-measurement transducer comprises a thin-film magnetic coil for passing an alternating premagnetizing current, generating an alternating premagnetizing field, and a magnetic-field...
4378525 Method and apparatus for measuring a DC current in a wire without making a direct connection to the wire  
A pair of semi-circular, hard magnetic sensors are rigidly fixed within separate blocks which are in turn removably received in corresponding housings mounted to the jaws of a spring biased clamp....
4371832 DC Ground fault detector wherein fault is sensed by noting imbalance of magnetic flux in a magnetic core  
A dc ground fault detector in which ground fault is sensed by noting an imbalance of magnetic flux due to a pair of windings on a toroidal core.
4370612 Interferometric optical fiber electric current measuring device  
The current-measuring device in accordance with the invention comprises an optical fiber wound around the conductor in which flows the current to be measured, a laser source, means for separating...
4362990 Current- and voltage-measurement transducer  
A transducer for measuring a current, includes a magnetic core which has a gap substantially impeding passage of any magnetic flux, a coil arranged to pass a premagnetizing current for producing a...
4348587 Fiber optic transducer for measuring current or magnetic field  
A multi-mode optical fiber is used to detect electrical currents or magnetic fields from a remote source. The optical fiber, which serves as the sensor, is composited with metal capable of...
4324255 Method and apparatus for measuring magnetic fields and electrical currents in biological and other systems  
A method and apparatus for measuring magnetic fields and electric current flow in biological systems and other systems employing a room temperature pick-up probe connected to a superconducting...
4320433 Earth-leakage-current circuit breaker system  
For use in D-C power transmission systems there is provided a circuit breaker system which is responsive to leakage currents to ground to break the circuit from the power source to the D-C...
4314200 Method and apparatus for detection of magnetization  
A method of, and apparatus for, the detection of magnetization of a magnetic circuit, especially for the detection of a current flow interlinked with the magnetic circuit, wherein a timed or...
4307429 Method and apparatus for monitoring conductor currents for a fault current  
A method and apparatus for monitoring conductor currents for a fault current which changes the magnetic bias of a magnetic circuit in which the magnetization of the magnetic core is alternatingly...
4301408 Electrical measuring apparatus employing magneto-electric devices  
An electrical measuring apparatus comprising a current domain magnetometer (C.D.M.) (1) and summation means (2) for summing the output pulses from the C.D.M., the sum of the summation means...
4298838 Transformer device  
A transformer device comprises a saturable magnetic core having control and controlled windings, the saturable magnetic core being controlled in a feedback mode through switch means such as...
4296376 Probe for sensing characteristics of electrical devices utilizing a magnetic switch sensor biased by an encircling magnetic biasing means  
A probe for sensing energizations of electrical components and particularly the energization of a relay or solenoid, the probe utilizing a magnetic switch as a sensor, a light-emitting diode as an...
4293813 Current measuring system  
Current measuring system particularly suitable for use as an earth leakage detection system and functional device equipped with such a system e.g. an earth leakage switch.
4286211 Direct current detecting device using saturable reactors  
A direct current detecting device is disclosed in which two pairs of saturable cores are provided so as to enclose a conductor carrying a direct current to be measured. On each of the saturable...
4280093 Zero-current detector for high voltage DC transmission line  
A saturable magnetic reactor is disposed about one of the current-carrying conductors in a DC power transmission line. A zero-current status for the transmission line is sensed by means of...
4280162 Ground fault circuit interrupter  
A device for sensing current flow in an electric conductor employs a ferromagnetic core coupled to the conductor and a control winding on the core for applying a periodic magnetic flux to a part of...
4278939 Electromagnetic arrangement for measuring electrical current  
A line current measuring arrangement employs two separate toroidal cores with line windings and control windings. The line windings cause equal amounts of the same polarity of magnetizing intensity...
4278938 Electromagnetic arrangement for measuring electrical current  
A line current measuring arrangement employs a single toroidal core with line windings, control windings, and a sense winding. The line windings cause an amount and polarity of magnetizing...
4276510 Apparatus for sensing current transformer primary current as a function of differential core inductance  
The secondary winding of a current transformer is driven by a high frequency AC source to excite the core to alternating, uniformly equal positive and negative peaks of current excitation. An...
4274051 Electromagnetic arrangement for measuring electrical current  
A line current measuring arrangement employs two matched toroidal cores with line windings, control windings, sense windings, and feedback windings. The line windings cause equal amounts of the...
4274052 Current meter using core saturation  
It is known for current meters to operate by sensing the magnetic field produced by the unknown current being measured. Such meters may include a core (200-1) of magnetic material which may be...
4272724 Magnetic modulator for magnetic field detection differentially outputting magnetic core noise  
A magnetic modulator for detection of a very small magnetic field and current, comprising a rectangular or annular one-piece magnetic core divided into a plurality of core legs which are adapted to...
4266190 Dual core magnetic amplifier sensor  
A magnetic amplifier sensor for measuring the magnitude and polarity of a DC current flowing in a line includes a pair of saturable cores, each having a primary and secondary winding mounted...
4243936 Method for magneto-optical current measurements  
A method is described for magneto-optical current measurements using a linearly polarized light beam in which the light beam is alternatingly polarized by polarization modulation at a given...
4243931 Current isolator  
A current isolator circuit generates an electrically isolated output current which is related to an input current. The current isolator includes a magnetically saturable transformer having a core...
4232264 Arrangement for the magneto-optical measurement of currents  
An arrangement for the magneto-optical measurement of currents with a linearly polarized light beam in which the measuring path contains an analyzer with two orthogonal pass directions, over which...
4232265 Device for measuring intensity of magnetic or electromagnetic fields using strain gauges mounted on ferromagnetic plates  
A device for converting the intensity of a magnetic or an electromagnetic field into an electric signal wherein movable elements are made as ferromagnetic plates rigidly fixed in supports so that...
4180775 Magnetic thin-film split-domain current sensor-recorder  
A sensor-recorder for recording a representation of the direction and peak amplitude of a transient current. A magnetic thin film is coated on a glass substrate under the influence of a magnetic...
4126826 Measurement system signal isolation  
A transformer primary is first biased with a current sustained at least long enough for any secondary voltage to drop to zero. Then the primary is open circuited. The resultant secondary voltage is...
4118597 Method and apparatus for detecting direct currents in a transmission line  
An electromagnetic sensing apparatus includes one or more magnetic cores coupled by windings to a pair of transmission line conductors for sensing the presence, and in some cases the magnitude and...
4101829 Differential current detector  
In a power distribution system having a first conductor carrying a current I 1 and a second conductor carrying a current I 2 , in the same direction as I 1 , a differential current detector...
4100488 Apparatus for measuring electric current  
Direct currents and alternating currents superposed upon same are measured by embracing the current conveying conductor with a prong-type meter. The jaws of the prong are provided with guide means...
4050013 Magnetic field probe which measures switching current of magnetic element at moment the element switches as measure of external field  
A probe for sensing the strength of the magnetic field that surrounds a current-carrying conductor has a square-loop magnetic material wrapped about a conductor which is placed in the magnetic...
4025849 Method of measuring analog input voltages through isolation transformers and apparatus for the same  
In measuring analog input voltages through isolation transformers, an analog input voltage V in is applied across a primary winding of the isolation transformer, voltages V A and V B developing...
4023100 Transformer for d-c signals  
In the d-c transformer of the present invention a current changing between two maximum values of opposite polarity is impressed on the secondary winding of the transformer. One input of a...
4021729 Cross-field ground fault sensor  
A differential transformer having a core of low permeability ferromagnetic material, a pair of identical primary windings and a secondary winding of relatively few turns capable of producing a...
4011505 Current measuring device  
A current measuring device for measuring a current flowing in a conductor by inductive coupling to the conductor, the device having an E-shaped core of magnetic material and a slidable bar normally...
3983477 Device for measuring extra high voltage line current  
A ferromagnetic element tuned oscillator is located close to a current carrying conductor and is provided with a power supply energizing means. Means are provided for transmitting the information...
3913015 Tuned current probe  
High transfer impedance and hence improved sensitivity is achieved in line current measuring apparatus by making the current detecting probe resonant to the frequency of the line conducted signal...
3885213 Measuring probe for intense and variable electric currents  
The probe comprises a metallic wire formed into a core on itself or on an insulating coil and arranged so as to form a plurality of turns of the same cross section and distributed regularly along...
Matches 451 - 500 out of 599 < 1 2 3 4 5 6 7 8 9 10 11 12 >