Abstract: An electric noise absorber, comprising hollow cases that are shaped so as to surround the periphery of electric cable of an electronic device and are filled with a magnetic substance, such as grain ferrite, which absorbs electric noise on the electric cable. The hollow cases are molded to fit the electric cable and the quantity of magnetic substance is adjusted to reduce as much electric noise as desired. Consequently, the electric noise absorber is made easily and has no extra units.

Abstract: A transformer has a multi-turn magnetic core about a loop of conductor. A bridge transformer has one turn of the core about one half of the conductor loop and a second turn of the core about the other half of the conductor loop, and an electrical center tap connection to the loop between the two halves thereof. Embedded diodes connect the ends of the loop to an external circuit.

Abstract: A multi-magnetic field plural core transformer having two or more non-contacting core loops of ferromagnetic material, each core loop including first and second portions, the first portion of each core loop being positioned adjacent to the first portions of the other core loops with each core loop first portion encircled by a primary winding, and the transformer having means for electrically interconnecting the primary windings in circuit with one another, and at least one secondary winding passing through all core loops.

Abstract: A multiconductor shielded connector is disclosed in which a flexible, compressible double bushing is used between the connector half shells and the multiconductor cable. The double bushing comprises an outer bushing dimensioned to grasp the outer jacket of the cable at the exiting end of the connector. A concentric, longitudinally offset inner bushing is inserted under the shielding (braid or foil) and mates with ridges on the inner surface of the half shells to form a tight, continuous radiation seal. A ferrite ring is inserted into a recess on the inner diameter of the inner bushing to provide noise suppression for signals traveling through the conductors of the cable. The inner and outer bushings are connected together with a fine web which maintains concentricity and axial displacement of the bushings before and during assembly, but which does not interfere with the operation of the connector after assembly.

Abstract: A high frequency matrix transformer power converter module includes a dedicated, pre-wired secondary winding, inductor and filter capacitor wherein the electrical conductor forming the dedicated secondary winding is made from a flat ribbon material and passes through adjacent cores forming the interdependent magnetic elements of the matrix transformer such that helical portions of the conductor forming the winding are in complementary arrangement within the core structure and provide an opening through which a second electrical conductor forming a primary winding may be inserted after the module is constructed to obtain the desired transformation characteristics. A number of modules may be arranged side-by-side to provide a higher power output wherein the output voltage busses of the modules are connected together and wherein through holes of each module are in registry to permit wiring of an undedicated primary winding to obtain the desired power output.

Abstract: The invention provides an electromagnetic device such as a transformer which comprises one or more electrically conductive windings in a cylindrical magnetic frame. The magnetic frame defines a magnetic flux path having a length which is less than the length of the portion of the windings enclosed by the magnetic frame, and the device includes heat dissipation elements disposed about the windings and extending transversely from the windings. The magnetic frame comprises a number of toroidal core sections which are stacked end to end, so that the magnetic frame has an elongate tubular form. The heat dissipation elements are plates located between adjacent core sections.

Abstract: An electric noise absorber for clamping to a cord of an electronic device comprises a holding case composed of two box-shaped case members. Each case member contains a magnet having a hemi-cylindrical groove at the upper part of the magnet for receiving the cord. It is possible to easily and securely attach and detach the electric noise absorbing magnet to the cord by simply closing and opening the case members.

Abstract: An electric noise absorber for clamping to a cord or cable of an electronic device comprises a retaining case composed of two box-shaped case pieces. Each case contains a magnetic body having a recess at the upper part thereof for receiving the cord. It is possible to easily and securely attach and detach the electric noise absorber to the cord or cable by simply closing and opening the case pieces.

Abstract: A transformer structure includes two planar primary windings in a single plane with one primary winding on each leg of a core. The primary windings are connected in series or in parallel. The secondary structure includes a planar conductor structure about the core. A conductor passes through the core and makes electrical connection to the planar conductor through diode rectifiers. An anti-phase embodiment has dual primary circuits and dual cores with a combined secondary structure. Both plate-form and circuit card form embodiments are disclosed.

Abstract: Electric pulse generator having at least one capacitor in the form of a coaxial line section and a saturatable inductance coil serving as a switch. According to the invention, the saturatable inductance coil is located within the internal conductor of the coaxial line.

Abstract: A high frequency matrix transformer comprises a plurality of interdependent magnetic elements interwired as a transformer. The various component parts of the high frequency transformer are arranged and interwired to provide a transformer having very low leakage inductance and very good coupling from the primary to the secondary. The high frequency matrix transformer is particularly well adapted for transformers requiring high equivalent turns ratios, high frequency, high power, and high dielectric isolation. It can have a plurality of parallel secondaries, which can source current to parallel rectifier circuits with current sharing. It can also have a plurality of parallel primary circuits, which also will current share, to balance the load between source switching circuits, or to provide dual input voltage capability (i.e., 120/240 volts). The high frequency matrix transformer tends to be spread out, and can be very flat, making it eaasy to ventilate or heat sink.

Abstract: 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 time of day and date over an extended period of time. The ammeter employs two C-shaped cores defining between two of the core arms a relatively large permanent gap that can pass the power line to facilitate mounting on the line using a live-line stick. One embodiment intended for mounting for an extended period of time also employs a clamp that can be manipulated using the stick to clamp it to the line and unclamp it, the clamp and core being related so that the power line passes through the center of the space between the cores. An embodiment intended for "spot" measurements has a locating member that performs the same function. A third device has the locating member in two parts that pivot to enable a large power conductor to pass through the slot in the locating member to the closed locating end thereof.

Abstract: An electric noise absorber for attaching to a wire of an electronic device comprises a magnetic body divided into parts, a holding case composed of two case members and a locking device for preventing a movement of the magnetic body in the holding case. Each abutment surface of the two parts of the magnetic body cut by a cutting plane are sufficiently larger in area than a basic cross section of the magnetic body in order to prevent magnetic resistance of the abutment surface from being increased. Further, the dislocation of the two parts of the magnetic body can be prevented by the locking device. As a result, the magnetic body is securely held in the holding case to absorb noise curent effectively.

Abstract: To manufacture an electronic component of the present invention and according to a method of manufacturing the electronic component also of the invention, steps of positioning and temporarily fixing the electronic component element are performed by the use of a bent portion formed on the lead wire, the bent portion of the lead wire being pressed into the through hole of the electronic component element. Thereafter, the bonding agent, which was applied to the bent portion, is filled into the through hole of the electronic component element by capillarity. Alternatively, the bonding agent may be injected into the through hole after the lead wire is inserted. Thus, the bonding agent is filled in a shorter time.

Abstract: A transformer system for measuring electrical current includes an electrical conductor having first and second conductor portions. The first conductor portion conducts electrical current in one direction and the second conductor portion conducts the electrical current in an opposite direction. The first conductor portion produces a magnetic field H.sub.a and the second conductor portion produces a magnetic field H.sub.b. A coil having a non-ferromagnetic core is positioned between the first and second conductor portions so that the axis of the coil is substantially parallel to the magnetic fields H.sub.a and H.sub.b. The separation between the outer circumferential surface of the coil and the first and second conductor portions is the minimum distance for avoiding a voltage breakdown therebetween for a predetermined maximum electrical current in the conductor portions. At least one ferromagnetic shield surrounds the first and second conductor portions for shielding the coil from external magnetic fields.

Abstract: The current converter or transformer component of a high voltage measurement transformer comprises a primary lead or conductor which is surrounded by secondary windings or optical conducting elements. The primary and secondary components of the current converter or transformer component are housed in a casing having an integrally formed entry duct for the secondary leads. The secondary components of the current converter or transformer component are surrounded by plastic or synthetic insulation material. This insulation material or insulation also surrounds a channel for the secondary leads extending completely through the entry duct. The primary lead or conductor is provided with connecting flanges at both ends for mechanically or electrically connecting the high voltage measurement transformer to a high voltage or high power circuit breaker or similar device.

Abstract: An inductor suitable for use as a noise filter and a method for manufacturing the inductor. The inductor comprises a combination of a U-like-shaped lead wire comprising a head and a pair of legs bent from both ends thereof and extending opposite to each other with tubular magnetic material cores insertably fixed to both the legs respectively, the lead wire forming between one ends of the magnetic material cores and the head exposed portions where parts of the lead wire are exposed, and at the legs at the other end sides of the cores arcuate portions which absorb impact applied to the lead wire respectively.

Abstract: A filter circuit is provided in the secondary of a power transformer following a rectifier and is composed of two chokes respectively arranged in the series arms of the lines leading to two output terminals, and at least one shunt capacitor. Each of the chokes is composed of a winding fashioned as a strip-shaped interconnect, whereby both windings are conducted through a common magnetic core in the same winding sense.

Abstract: A magnetic head integrally assembled with a step-up transformer. The magnetic head portion is formed on a lower substrate by a thin film technology and the number of turns of the signal winding is 1 or a value near 1. The transformer portion mainly comprises a transformer magnetic circuit which is formed by the lower substrate and upper substrate. A one-turn primary coil of a thin film formed over the lower substrate and a secondary coil by a bulk wire are arranged so as to couple inductively with each other through the transformer magnetic circuit. The signal winding and the primary coil winding are formed by the same thin film process. The head portion and the transformer portion thus are arranged very closely and hence coupled with very little transfer loss of signal.

Abstract: A static trip overload relay includes a plurality of phase current sensing transformers having two-piece cores. One core piece of each transformer core is positionally mounted by the relay housing, while the other piece is positionally mounted by a carrying case movably mounted within the housing. By varying the case position within the housing, the air gaps between the two core pieces of each transformer core are correspondingly and concurrently varied pursuant to calibrating the relay to operate at any one of a range of circuit current ratings.

Abstract: An inductive device composed of a bead of magnetic material, such as ferrite, has an aperture through which an electrical conductor is adapted to pass. The bead is formed unsymmetrically about at least one axis. The asymmetry of the bead alters the magnetic characteristic of the bead so as to increase its ability to absorb volt-seconds on the conductor and thereby prevent destructively high currents. The inductive device is advantageously used in the d.c. supply to the power transistors of an inverter to protect the transistors from current surges due to the simultaneous conduction of the transistors.

Abstract: A pulsed transformer capable of providing up to 500 kilovolt or higher, 10 nanosecond rise time, and 1000 joule or higher pulses comprising non-conducting or insulated transformer cores each separated by conductive grading rings wherein n coaxial cables in combination with the grading rings are connected in parallel at one end and in series at their other ends. The transformer may function as either an inverting or non-inverting transformer. In a transformer with n cables, if a pulse voltage of V is applied to the input, an output voltage of nV will appear at the output. The cores function to isolate the coxial cables and permit them to be connected in series at their one end. Weight may be minimized by operating the transformer in gaseous Freon rather than transformer oil.

Abstract: A high saturation three coil current transformer for use with electrical apparatus having a U-shaped conductor portion. The current transformer has a ferromagnetic core surrounding one leg of the U-shaped conductor. The core is formed from two U-shaped core portions. A first coil and a second coil are wound on bobbins, with one bobbin being placed around each juncture between the core portions. A third coil is wound about the middle section of one of the U-shaped core portions prior to the core portions being joined. The current transformer is positioned so that the U-shaped conductor surrounds the third coil.

Abstract: An electrodeless low-pressure discharge lamp comprising a glass lamp vessel (1) which is sealed in a gas-tight manner and is filled with a metal vapor and a rare gas, this lamp vessel being provided with a tubular protuberance (2) which accommodates a rod-shaped core (3) of magnetic material surrounded by a wire winding (4) connected to a high-frequency supply unit, by means of which during operation of the lamp an electrical discharge is maintained in the lamp vessel, the inner side of the lamp vessel being provided with a transparent conductive layer (10), which is electrically connected by means of a lead-through member (12) to a conductor, such as a metal rod (11) provided in the core (3), located outside the lamp vessel, this lead-through member (12) being located at the end of the tubular protuberance, and being electrically connected to the internal conductive layer, for example by means of a wire spring (15).

Abstract: An electrodeless low-pressure discharge lamp comprising a glass lamp vessel sealed in a gas-tight manner and filled with a metal vapor and a rare gas, and a winding on a ferrite core. During lamp operation an electrical discharge is maintained in the lamp vessel by the winding connected to a high-frequency supply. The winding is surrounded by a thin-walled cylindrical metal body or layer which is electrically insulated from the winding, is interrupted at at least one area and is connected during operation of the lamp to one of the power mains conductors.

Abstract: This process produces a small toroidal winding used, for example, to make very stable, thin magnetic magnatometers. To produce a winding having turns which are perfectly radial with respect to a cylinder, use is made of an internal cylinder and an external cylinder provided with slots arranged along the generatrixes of these cylinders. Hairpin-shaped conductive wires are introduced into these slots and welded to one another.

Abstract: A face connected instrument transformer is disclosed having a plurality of transformation ratios comprised of two primary windings and a single secondary winding. Each primary winding is electrically connected to a pair of terminals disposed adjacent to opposite faces of the transformer housing for engaging contacts within a molded case circuit breaker housing. The transformation ratio of the instrument transformer is changed by removing the instrument transformer from the circuit breaker housing and inserting the opposite face.

Abstract: A compact and inexpensive current sensor includes a planar coil assembly mounted, as by printing, on a substrate such as a circuit board. A closed-loop flux concentrator extends through the coil and also through the board. A conductor carrying the AC current to be sensed is positioned in proximity with the flux concentrator. The flux concentrator is of one-piece construction, having a pair of opposed leg portions in overlapping relation and fastened to the circuit board. A current-summing amplifier amplifies the low-amplitude emf provided by the coil assembly and, with further circuitry, provides an indication and/or control commensurate with the sensed current being above or below some value.

Abstract: A current transformer comprises coil forms mounted on two opposite legs of a rectangular iron core, and insulating parts for insulating the iron core from a current bar which can be brought through the interior of the current transformer. The coil forms are connected together at both ends by an insulating part which surrounds at least partially the exposed legs of the iron core in U-fashion. For manufacturing a current transformer, the coil forms are first connected by assembling the insulating parts to the coil forms to form a frame into which L-shaped laminations are inserted to form the iron core. These laminations are connected at the abutting gaps by a welded seam. The current transformer is suitable particularly for use in low-voltage circuit breakers.

Abstract: An electrical transformer having a rectangular core of solid magnetic material, forming a circular or rectangular-section shell in which primary and secondary windings are located. The corners of the core may be open to lighten the transformer and increase heat dissipation. A capacitor may be connected across the secondary winding to increase the efficiency of the transformer.

Abstract: A molded case circuit breaker plastic support saddle includes means integrally formed therein for supporting the main bus conductors along with neutral conductors. The neutral conductors are arranged as a pair of conductors parallel with and outboard of the main bus conductors. Interconnection between the neutral conductors is made by a C-shaped insulated metal crossarm contained within a two-part insulating casing. This arrangement of the main bus conductors and neutral conductors allows for robotic assembly in a high speed manufacturing process.

Abstract: A flat matrix transformer or inductor is made of a plurality of interdependant magnetic circuits, arranged in a matrix, between and among which electrical conductors are interwired, the whole cooperating to behave as a transformer or inductor. The flat matrix transformer or inductor has several advantageous features, among them compact size, good heat dissipation and high current capability. A flat matrix transformer or inductor can be very flat indeed, nearly planar, and can be built using printed circuit board techniques. A flat matrix transformer can insure current sharing between parallel power sources, and/or between parallel loads. The flat matrix transformer can be configured to have a variable equivalent turns ratio.

Abstract: An electronic noise suppressor has a U-shaped wire or other conductor passing through two stacked ferrite beads. The bead near the legs of the conductor is of high frequency impedance and the bead at the head of the U is of low frequency impedance. The legs of the U-shaped conductor are connected into an electronic circuit in which noise is to be suppressed.

Abstract: A common neutral bus is formed in a lower frame extension of a large three-phase generator by disposing three sets of neutral current transformers within the lower frame extension and interconnecting the three phases downstream of the neutral current transformers to form an internal neutral bus. The neutral bus is connected to an external neutral transformer through a neutral terminal of small size and low cost. Clamshell clamps are provided in the internal neutral bus for isolating the neutral ends of the generator winding for test purposes. Rigid support of the current transformers and a hollow copper tube passing therethrough permits use of light and low-cost hollow copper tubing in place of the relatively substantial and expensive neutral terminals conventionally required.

Abstract: A current transformer is provided for the electronic trip unit of a molded case circuit breaker. The current transformer has a core with a winding encoiled about the core and a bus spiraled about the core. The spiral bus establishes a current path from one end of the bus to the other which will conduct current through the core in a spiral fashion. The spiral bus design effectively rotates the bus 90 degrees achieving a narrow transformer design which fits into the electronic trip unit without increasing the width of the trip unit.

Abstract: An A.C. overload current sensing, remote power controller of minimum size and weight and integral construction. Current rate sensing wound toroids are used that are small enough to fit around the line terminal studs without having to enlarge the prior insulator space available therein. The electronic overload current detecting and tripping control circuit is replaced by a pair of modules, detector and control modules, having improved performance and a shape and size such that they fit within the relay housing alongside its operating magnet. The detector module has integrator means for converting current rate of change signals into current magnitude indicative signals thereby enabling use therewith of rate sensing wound toroids of about one-tenth the size of equivalent current transformer wound toroids.

Abstract: A holder for mounting a split type zero-phase current transformer on an electric wire or cable. The holder has a cylindrical portion made from a flexible material such as a rubber and is provided with a slit extending over the entire axial length thereof. At least one protrusion protrudes inwardly from the inner surface of the cylindrical portion. This holder can be used for a large variety of diameters of electric wire or cable in mounting the split type zero-phase current transformer on such electric wire or cable.

Abstract: The current transformer for instruments for measuring electric currents includes a magnetic core that has two cores and an inductive current divider with three parallel current paths. The current dividers form, together with cores, two current transformer stages whose magnetic fluxes mutually cancel one another. In a current transformer for AC currents having a DC component, the ratio of the ohmic resistances of the individual current paths is in direct relation to their transformation ratio.

Abstract: A transducer for measurement of a current includes a magnetic core, a single U-shaped flat conductor which has two wings, and a crown joining the wings. Each wing has two openings, and the magnetic core passes through the openings. The two wings constitute two conductive branches in thermal contact with one another, and each branch is adapted to carry a component of the current; the current component carried by one branch differs from the current component carried by the other branch. The current components give rise to opposite respective component fluxes in the magnetic core.

Abstract: A mounting device is disclosed which provides mechanical support and electrical insulation for a current transformer used in monitoring radio frequency signals in the neutral lead of a dynamoelectric machine. By encapsulating the current transformer in a rigid insulative apparatus with a central conductor passing therethrough, the transformer can be placed proximate the neutral bus of the dynamoelectric machine to avoid attenuation of the radio frequency signals.

Abstract: A system for supplying power to a field winding to maintain excitation of an alternating current generator during excessive output current conditions, the generator having a plurality of output lines for supplying power to a load and the field winding being supplied during normal operating conditions by a shunt type voltage regulator responsive to the output voltage of the generator. The system includes a current transformer having a primary winding in series with an output line of the generator, a secondary winding, and a tertiary winding shunted by a capacitance. A rectifier circuit rectifies the voltage supplied by the secondary winding, the output terminals of the rectifier circuit being connected in series with the regulator output terminals to supply power to the field winding. A control circuit, connected to the output of the generator and responsive to output current conditions enables the rectifier circuit output during excessive output conditions.

Abstract: A measuring transformer for use with high-voltage switch-gear of a type which employs metal encapsulation. The transformer is retained between flanges at a joint of the metal encapsulation and includes a sealing and insulating spacing means. The latter forms a ring-shaped cavity with the flanges and seals such cavity from the interior of the metal encapsulation. In the ring-shaped cavity is disposed at least one iron core having a secondary winding placed thereon, the latter core together with the inner conductor of the high-voltage switch-gear forming a current transformer.

Abstract: A high-voltage transformer-rectifier device comprising a step-up three-phase transformer with a spatial magnetic circuit made up of three vertical stacks (7) of closed cores (9) insulated from one another and secured in an insulating frame (8), having a common window and carrying the sections (10) of a secondary winding (2). A primary winding (1) comprises three flat rectangular coils (11) whose vertical parts are arranged to lie pairwise along the axis of the common window in each stack (7) of the cores (9). A bridge rectifier section comprises individual bridge rectifiers connected to the sections (10) of the secondary winding (2), and each of the potential screens is formed by ring sections (6 and 20) arranged one on top of another along the stacks (7) of the cores (9).

Abstract: In an induction heating apparatus, direct sensing of the high frequency high power current flowing in the tank circuit to load the induction coils, is obtained with a coil current measuring transformer comprising one of the power current busses leading to the induction coil and a secondary winding of many ampere-turns wound around said one bus. The bus is given a half-loop shape to accommodate the secondary winding. The secondary winding is made of a magnetic core wound with many turns of Litz wire. Cooling tubes are cemented outside the wound secondary with conductive cement to form a heat sink with a circulation of cooling medium through the tube. The cement is divided in two parts separated by gaps to prevent circulation of induced currents. A cooling tube is installed between the core and wound wire to provide an internal heat sink.

Abstract: The electrical energy flowing between a power source and a furnace blower motor is sensed for controlling the operation of a humidifier. A removable current sensor is connected without damaging or disfiguring the connecting lead being sensed. A solid state switch operatively connects the humidifier to a power source in response to the sensed current and is electrically isolated from the current sensor. The control circuit provides a time delay in the energization and the de-energization of the humidifier and is responsive to the current flow in the sensed lead.

Abstract: High frequency transformer built from coaxial conductor sections, wherein a pair of coaxial conductor sections of equal length have external conductors which are insulated from each other. The input end of the external conductor of the first coaxial conductor section is connected with the input end of the internal conductor of the second coaxial conductor section and both of the unconnected input end internal and external conductors form input connections. The output end of the internal conductor of the first coaxial conductor section is connected with the output end of the external conductor of the second coaxial conductor section and both of the unconnected output end internal and external conductors form output connections.

Abstract: A distribution network power line communication system divided into addressable communication zones defined by signal repeaters located at spaced intervals along the distribution network. The signal repeaters are switchably disposed in signal communication between the primary and grounded neutral conductors of the primary distribution network. Each repeater, when uniquely addressed by an interrogation signal from a central communication terminal, transfers the interrogation signal from the primary conductor to the primary grounded neutral conductor whereon it is transmitted to a uniquely addressed remote communication terminal coupled to a secondary neutral conductor within the communication zone of the signal repeater. A timely response signal from the remote communication terminal on the grounded neutral conductor is transferred by the repeater to the primary conductor and then to the central communication terminal.

Abstract: A high voltage signal coupler couples carrier communication signals between a distribution network primary conductor and communication elements located at spaced intervals on the distribution network. A single bushing, high frequency, coupling capacitor communicates the carrier communication signals between one of the distribution network primary conductors and a conductor which is at ground or real earth potential with respect to power current frequencies. A parallel resonant circuit, formed by a tuning capacitor and a hollow core of magnetic material inductively surrounding the power frequency ground conductor, couples the carrier communication signals to the communication elements connected thereto at a predetermined frequency without interfering with the operation of the ground conductor at the frequency of the power current.

Abstract: Especially simple structure for an electrical transformer device provides cost effective fabrication thereof and offers improved operating performance particularly in a radio transmitter circuit for coupling high levels of radio frequency energy from the output of a radio frequency amplifier to an antenna system. One winding of the transformer is formed from a single, unitary, tubular member arranged into a U-shaped configuration which includes a pair of spaced sets of openings therein for the two-fold purpose of allowing efficient threading of a secondary winding therewithin and to improve air cooling characteristics of the device. A second winding comprises a wire passed through the interior of the tubular member, and a number of cylindrically shaped magnetic elements are sleeved over the tubular member to enhance the mutual inductive coupling between the windings.

Abstract: 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 large voltage output for a small magnitude ground fault current. A cross-field winding is utilized to periodically saturate a portion of the flux path in the transformer core to produce sudden changes in magnetic flux, which flux changes vary in magnitude proportional to the amount of fault current. During the time interval when the cross-field portion of the sensor is not saturated by a pulse of sampling current, a second pulse of current is introduced into the sensor secondary winding for detecting a grounded neutral wire by sensing the output voltage produced in response thereto.