Abstract: A system for protecting a transformer is provided. The system includes an inductor electrically disposed between the transformer and a load powered by the transformer, and a resistor electrically disposed in parallel with the inductor between the transformer and the load.

Abstract: A power transmission device includes: a power supply circuit that generates an alternating voltage; a power transmission coil that receives an alternating voltage generated by the power supply circuit to thereby generate a magnetic field; a power transmission resonator that includes: a resonant coil; and a resonant capacitor and through which electromagnetic induction causes an electric current to flow when a magnetic field is generated by the power transmission coil to enter a resonance state; and a control circuit that controls the position or the orientation of the power transmission coil with respect to the power transmission resonator in the direction in which a standing wave ratio in a transmission line from the power supply circuit to the power transmission coil decreases.

Abstract: The invention provides a voltage sensor for a very high-voltage direct current line comprising two voltage divider stages connected in series, the sensor being characterized in that a first voltage divider stage (E1) that divides the very high voltage to an intermediate voltage is constituted by at least two elementary voltage divider stages (Em) connected in series and distributed in a composite insulator (I), each elementary stage (Em) comprising a resistor Re in parallel with a capacitor Ce, the second voltage divider stage (E2) that delivers the intermediate voltage being constituted by electronic components comprising capacitors and/or interchangeable resistors.

Abstract: Systems, methods, and heaters for treating a subsurface formation are described herein. At least one method for providing power to one or more subsurface heaters is described herein. The method may include monitoring one or more operating parameters of the heaters, the intermittent power source, and a transformer coupled to the intermittent power source that transforms power from the intermittent power source to power with appropriate operating parameters for the heaters; and controlling the power output of the transformer so that a constant voltage is provided to the heaters regardless of the load of the heaters and the power output provided by the intermittent power source.

Abstract: A power supply circuit enabling provision of good energy efficiency and downsizing is provided. A power supply circuit 1 according to the present invention includes: input terminals 2, 2 connected to a commercial power supply 10; a winding 4 serially connected between the input terminals 2, 2 via input conductors 3; and a plurality of output terminals 6A, 6B connected to opposite ends of respective windings 4A and 4B resulting from dividing the entire winding 4 into a plurality of parts via output conductors, the respective output terminals 6A and 6B being independently connected to respective loads 20A and 20B.

Abstract: In a power supply system, reducing influence of a noise etc., optimal electric power is supplied corresponding to power consumption of a receiving side load, and power consumption is decreased greatly. When a potential difference detector 12 detects that a power supply voltage of the receiving side load is decreased lower than a lower limit voltage threshold or increased higher than an upper limit voltage threshold, a burst interval setting unit sets up a burst signal of a pulse width corresponding to the detection result. A burst signal generator generates a burst signal based on the setup, and excites a control primary inductor. A burst signal detector generates a pulse signal in response to electromotive force of a control secondary inductor.

Abstract: An apparatus and method for measuring the source-side line voltage from a source potential transformer (PT) of a regulator during reverse power flow. A reverse power regulation algorithm is employed during reverse power operation of the tapchanger to energize a contact relay which switches the analog voltage input from the load side to the source side of the regulator. Voltage regulation then operates based on the measured source side voltage instead of the traditional calculation of the source side voltage based upon the load-side voltage and regulator type.

Abstract: [Task] The present invention aims to provide a vacuum capacitor instrument voltage transformer by which current and voltage can be much precisely measured. [Means for Achieving Task] The means is so made that a main capacitor portion 8 and a voltage dividing capacitor portion 10 are installed in a earthed vacuum vessel, a main ground circuit 30 is provided through which a leak current I2 flows from an outer surface of the primary line-path side vacuum vessel to the earth E, and a voltage dividing ground circuit 31 is provided through which a leak current I11 flows to the earth E through a voltage dividing insulating cylindrical member 11 that is disposed between an earthed portion and each of the main capacitor portion and the voltage dividing capacitor portion.

Abstract: An electric motor with an n-pole stator comprising a first stator winding and a second stator winding that can alternatively be supplied with current for the constitution of a pole-changeable electric motor. The supply winding is constituted by at least one turn of the first stator winding or of the second stator winding. Thus, a conventional winding design or coil design of the electric motor can be used to provide a supply voltage for electric equipment. The electric motor features an unchanged compact construction. Only at particular locations of existing stator turns current is tapped, such that a supply voltage of predetermined magnitude can be tapped based on the existing magnetic flux linkage during operation of the electric motor.

Abstract: A power supply system that includes: a power supply coil and a power supply-side resonance coil that are provided at a facility; a power receiving coil and a power receiving-side resonance coil that are provided for a mobile unit; a power supply-side detection unit that detects a position of the power supply-side resonance coil; a power receiving-side detection unit that detects a position of the power receiving-side resonance coil; and an adjustment unit that adjusts a relative position of the power supply coil with respect to the power supply-side resonance coil and a relative position of the power receiving coil with respect to the power receiving-side resonance coil on the basis of the position of the power supply-side resonance coil and the position of the power receiving-side resonance coil.

Abstract: The method and apparatus for implementing the same phase power supply scheme of the present invention is to utilize means selecting one phase from the three source lines, and supplying power only to the load at single phase line with the neutral line as a return (grounded) line, meanwhile de-energizing the loads of three phase lines at the demand side automatically during a period of time of power shortage.

Abstract: A voltage regulator having insert slots adopted for used on extension lines to stabilize electric current comprises a body which has an upper shell and a lower shell. The body is divided in a socket zone and a voltage stabilizing zone which houses an annular transformer. The voltage stabilizing zone is directly connected to input current. The annular voltage transformer can rapidly adjusts and achieves stable voltage according to voltage fluctuations of input current and different loading properties of the socket zone, and the annular voltage transformer is formed in a small size and a light weight to allow the voltage regulator to be made in slim and light.

Abstract: 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 C2 in series connection. The column is filled with oilless dry filler. The capacitors C1 and C2 formed by a plurality of separated metallized film capacitors respectively in series or in parallel connection. At the tapping point between the capacitors there is a leading-out terminal of the secondary voltage which is connected to an induction transformer L in parallel. The transformer includes a frame with “C” shaped iron cores and windings wound around the cores. There is an over-voltage protector P connected in parallel between the tapping point and ground. A capacitive voltage divider is integrally combined with the transformer to provide a small volume, low cost device with a savings in materials.

Abstract: A three-phase transformer circuit is disclosed that includes a supply side, wherein the supply side is selectably configurable between a delta connection and a wye connection at a time of use and, a load side, wherein the load side is selectably configurable between a delta connection and a wye connection at the time of use. The three-phase transformer also provides for selecting an input voltage, from multiple input voltages, at the time of use, and for selecting an output voltage for the supply side, from multiple output voltages, at the time of use.

Abstract: Differential measurement of a transformer magnetizing current and a delta-modulation technique is used to provide compensation for dc saturation of the transformer core, with faster response times, low losses, and with immunity to dc drift in the measuring electronics. During the half-cycle in which the output voltage transitions from its positive maximum to its negative maximum, the positive peak value of the magnetizing current is determined, and during the half-cycle in which the output voltage transitions from its negative maximum to its positive maximum, the negative peak value of the magnetizing current is determined. The positive peak magnetizing current value is compared to the similar value from the previous cycle, and the onset of core saturation in the positive direction is then determined. The negative peak magnetizing current value is compared to the similar value from the previous cycle, and the onset of core saturation in the negative direction is then determined.

Abstract: A isolated power supply for protecting electrical devices from transient voltages and currents is disclosed. Specifically, the filter has a toroid and resistor which are used in conjunction with an isolator transformer. The transformer's secondary windings are coupled to the electrical load sought to be isolated. The primary windings of the transformer are tied to an alternating current source with an earth ground lead. The primary shield lead of the transformer is tied to the earth ground lead. The secondary shield lead of the transformer is also tied to the earth ground. A toroid inductor and resistor in parallel are coupled between the secondary neutral lead and the secondary ground lead to shunt off current or voltage spikes. The earth ground is part of a chassis which prevents spark jump insuring the isolation of the power source. The isolator thus provides equal voltage potential between the secondary lead and the primary earth ground at frequencies of less than 1 kHz.

Abstract: In a flyback transformer, an insulating cover is interposed between a main body casing and a focusing pack casing. A through-hole is formed through a ceramic resistor accommodated in the focusing pack casing. A fixing hole is formed through the insulating cover in a coaxial relationship with the through-hole. A slider is fixed on a rotatable knob for a variable resistor, which is supported on the focusing pack casing. One of two tongues of the slider is maintained in contact under pressure with a variable resistor of the ceramic resistor, and the other tongue is arranged coaxially with the fixing hole and is maintained in contact under pressure with a wire-shaped output terminal. The terminal is press-fitted in the fixing hole. Another flyback transformer is also disclosed, which comprises a cylindrical holder portion.

Abstract: A voltage transformer with a voltage divider for measuring the voltage in medium high voltage and high voltage installations have a combined arrangement of an ohmic divider resistor and elements for compensating ambient electromagnetic effects, and the divider resistor is made of one peace with a measuring resistor and with taps, wherein at least one tap is connected with at least compensation element.

Abstract: A isolated power supply for protecting electrical devices from transient voltages and currents is disclosed. Specifically, the filter has a toroid and resistor which are used in conjunction with an isolator transformer. The transformer's secondary windings are coupled to the electrical load sought to be isolated. The primary windings of the transformer are tied to an alternating current source with an earth ground lead. The primary shield lead of the transformer is tied to the earth ground lead. The secondary shield lead of the transformer is also tied to the earth ground. A toroid inductor and resistor in parallel are coupled between the secondary neutral lead and the secondary ground lead to shunt off current or voltage spikes. The earth ground is part of a chassis which prevents spark jump insuring the isolation of the power source. The isolator thus provides equal voltage potential between the secondary lead and the primary earth ground at frequencies of less than 1 kHz.

Abstract: A dielectric power transformer comprises a tuning inductor having a nonmatic core connected in parallel with a capacitive voltage divider. The dielectric power transformer transforms the voltage of an alternating current power source connected across the inductor into a voltage across a load connected to the capacitive voltage divider. The dielectric power transformer has a resonant frequency substantially equal to the frequency of the power source.

Abstract: The invention pertains to a core for a coil device of a switching power supply which can avoid accidental breakage of the portion where the core cross-sectional area narrows. When one core segment is rotated 180 degrees about its center axis in the long direction of one leg 2, the projection 51 of one core segment 1A and the projection 52 of another core segment 1B, and the indentation 61 of the one core segment 1A and the indentation 62 of the other core segment 1B are aligned so as to mutually overlap. The characteristics of a coil device can be controlled by the contacting surface areas of both core segment projections or by spacing between the projections. Since the cross-sectional area of each core projection can be made wider, accidental breakage of the core projection does not occur easily.

Abstract: In a flyback transformer having a focus pack, in order to facilitate the manufacture and assembly of the focus pack, the focus pack mounted on the flyback transformer is constituted by an outer case portion and an inner case portion, and the outer and inner case portions are coupled to each other by a coupling portion and integrally formed. The inner case portion contains a circuit board having a resistor circuit for setting a focus adjusting voltage and a screen adjusting voltage. A focus insertion hole and a screen insertion hole are formed in the coupling portion. A focus shaft for variably setting a focus adjusting voltage is rotatably fitted in the focus insertion hole. A screen shaft for variably setting a screen adjusting voltage is rotatably fitted in the screen insertion hole. An insulating casting resin is injected between the gaps between the outer and inner case portions.

Abstract: An arrangement is provided for accurately sensing the source voltage of a high-impedance source while supplying a variable burden. A current-sensing element is connected in series with a load circuit across a high-impedance source. The load circuit includes a variable burden load. A shunt regulator is connected with the variable burden load and is arranged to operate so that the combination of the shunt regulator and the variable burden present a controlled, nearly constant burden to the high-impedance source. The source voltage of the high-impedance source is sensed via the voltage across the series current-sensing element. While the output voltage is directly proportional to the burden, the output current is essentially unaffected by small variations in the burden.

Abstract: A transformer with interference suppression includes a primary winding (1) with a first primary coil (27), one end of which is connected to a primary reference point (19), and also includes a second primary coil (39). The transformer has a secondary winding (3) with a secondary coil (33), one end of which is conductively connected to a secondary reference point (21). All of said coils (27, 39, 33) are solenoid coils which are concentrically arranged on a coil former (5) with intermediate electrical insulating means (29, 31; 29, 37) so that the first primary coil (27), across which the voltage drop amounts to U.sub.1p, is capacitively coupled to the secondary coil (33) across which the voltage drop amounts to U.sub.1s. The capacitance between these two coils has the value C.sub.1. The second primary coil (39), across which the voltage drop amounts to U.sub.2p, is capacitively coupled to a secondary coil (33) across which the voltage drop amounts to U.sub.2s.

Abstract: An auto-transformer has first and second input terminals and first, second and third output terminals, the second output terminal being connected to a center tap of a coil and the first and third output terminals being connected to such points of the coil which are symmetrical with respect to the center tap. The first and second input terminals are connected to such points of the coil which are symmetrical with respect to the center tap. A first group of loads is coupled across the first and second output terminals and a second group of loads is coupled across the second and third output terminals. By equalizing the load currents to the first and second groups, the total current of the auto-transformer can be made significantly small.

Abstract: In a circuit assembly (36) having a semiconductor chip such as a MOSFET (12) mounted on a drain terminal lead frame (6) on a ceramic substrate (4), a combined source and gate return reference jumper wire (40) is connected between a current sense lead frame (52) and a combined gate return reference and current sense lead frame (38). The jumper wire has a first middle portion (42) connected to the source pad (14) of the MOSFET chip (12), and has a second middle portion 58 connected to the source terminal lead frame (8). Direct gate return referencing is provided, minimizing inductance in the gate return which is otherwise present when the gate return current path shares a portion of the source terminal current path. Direct current sensing is also provided, and the IR drop is sensed across the section of the wire jumper between the noted first and second middle portions (42and 58), without the need of an auxiliary resistor in series with the source terminal.

Abstract: To compensate for voltage ratio errors in a cascaded core instrument potential transformer, the coils of an outer coupling winding otherwise utilized to magnetically couple an adjacent pair of cores together are electrically connected into the primary winding circuit to either add its turns to or subtract its turns from the primary winding turns in order to bring the secondary winding output voltage within acceptable accuracy tolerance limits.

Abstract: A device for varying an electrode voltage of a CRT of a color TV includes a novel potentiometer arrangement for adjusting the aforesaid electrode voltage. In known voltage-generating devices the electrode voltage is adjusted by a special potentiometer which can handle several kilovolts. According to the invention, the potentiometer track is constituted by a resistive layer (2) situated inside the interior of the output-voltage feedthrough (10) and the wiper is constituted by the end portion of the high-voltage cable (9) which is inserted into a tubular feedthrough portion and which can slide therein in order to adjust the voltage.

Abstract: A switched mode power supply transformer, particularly for a television receiver, including a primary winding and a secondary winding with the primary winding and the secondary winding each being subdivided into a plurality of respective partial windings. The partial windings of the primary lie in a first group of chambers and the partial windings of the secondary lie in a second group of chambers of a chamber coil body, and the chambers of both groups are nested or interleaved with one another.