53results about "Transformers/inductances with temperature compensation" patented technology

A reactor includes an annular core, coils, a sensor detecting a state of the reactor, and a connector outputting signal from the sensor. Resin-molded bodies are provided around the annular core. The resin-molded body has bobbins for the respective coils and core covering portions formed integrally with each other. An exposed area where no resin covers the bottom of the core is formed in the lower face of the covering portions. A holder to fasten the connector is formed integrally with the upper portion of the covering portion. An assembly including the resin-molded bodies in which the annular core is embedded, and the coils wound around the bobbins are retained in a metal casing. A clearance is formed between the assembly and the casing, and a filler is filled in this clearance. The filler covers the exposed area of the core bottom.

Method of assessing the remaining lifetime of a transformer operating at temperatures above IEC 60° C./65° C./78° C. or IEEE 65° C./65° C./80° C. including a core, a winding conductor covered by high temperature insulation material and pressboard material arranged as an insulation barrier and/or a supporting structure. The covered winding conductor and the pressboard material are immersed in a fluid having a fire point of at least 300° C. The method includes at least twice measuring the temperature of the fluid at its top surface and registering the time of each measurement and assessing the remaining lifetime of the transformer as a function of the measured temperatures and the corresponding registered times, and/or obtaining a sample of pressboard material that has been in contact with the fluid at its top surface and analysing the sample to assess the remaining lifetime of the transformer.

An antenna device that is able to maintain the resonance frequency approximately constant despite changes in temperature to provide for stabilized communication is provided. The antenna device includes an antenna coil that receives a magnetic field transmitted from a reader/writer and a capacitor. The antenna device also includes a magnetic sheet formed at a face-to-face position with respect to the antenna coil and configured for changing the inductance of the antenna coil. The capacitor has a temperature characteristic in which the capacitance of the capacitor is changed with changes in temperature. The magnetic sheet is formed of a magnetic material having a temperature characteristic in which the inductance of the antenna coil is made to be changed with an opposite sign of change to that of the capacitance of the capacitor that is changed with changes in temperature in the working temperature range.

Methods and apparatuses for cooling an electronic device assembly having a heat producing are described. An electronic device assembly includes a heat dissipation member and a dielectric two-phase heat transfer device. The dielectric heat transfer device has an evaporator region thermally attached to a hot region of the heat producing component and a condenser region thermally attached to the heat dissipation member. The dielectric two-phase heat transfer device is fabricated from a dielectric material.

An oil immersed stereo wound-core amorphous alloy transformer, comprising an iron core, a high-low voltage winding, leads and a tank. The core comprises three single frames made of amorphous alloy strips by winding and are identical in structure, and the single frames have a rectangular shape; the vertical sides of every two adjacent frames fit together fixedly to form a core pillar, and the horizontal sides of the single frame form iron yokes; the cross sections of the core pillars have an approximately circular or polygonal shape; the transformer further comprises a clamp, comprising a quasi-triangular upper and lower clamp, and posts, the lower clamp is provide with three food pads; the iron yokes in the lower portion of the iron core are located on the foot pads, and the high-low voltage winding is wound on the core pillars;

A problem to be solved is to stabilize temperature characteristics in various characteristics of a magnetic element. A magnetic element has a coil formed by winding a conductor, EP cores constituted of a magnetic material and passing magnetic flux generated in the coil, a solid part provided between EP cores opposing each other among the EP cores, and having a ceramics material or a resin material, in which the solid part is in contact with opposing faces of the respective opposing EP cores, and the solid part is provided with a thickness dimension ranging from 3 μm to 30 μm.

The invention discloses an oil congelation prevention type transformer oil tank for an extremely cold region, and belongs to the field of transformer oil tanks. The oil congelation prevention type transformer oil tank can realize the effects that when the temperature of insulating oil is relatively low, a plurality of deformed flow stirring needle bags immersed in the oil are expanded and contracted to different extents through the back-and-forth movement process of a concentric-square-shaped sealing plate, and do rotation distortion motion in the expansion and contraction processes at the same time, so that insulating oil keeps fluidity all the time, kinetic energy of the insulating oil and heat energy generated by friction with a box body, a semi-open clip-shaped frame and the deformation flow stirring needle bags in the oil flowing process are increased, the situation that the insulating oil is frozen at low temperature is effectively reduced, and normal starting and operation of atransformer are guaranteed. Besides, when the temperature of the insulating oil is too high in the operation process of the transformer, heat is transferred into the semi-open clip-shaped frame and the deformation flow stirring needle bags, and at the moment, through the back-and-forth movement process of the clip-shaped sealing plate, hot air can circularly move along the U-shaped cooling pipeline, so that the insulating oil is effectively cooled.

The invention belongs to the technical field of transformers. The invention especially relates to an outdoor transformer temperature control system based on a single-chip microcomputer. Aiming at theproblem that temperature control is inconvenient, the scheme is provided: the system comprises a bottom plate, supporting columns are arranged at the four corners of the outer wall of the top of the bottom plate, inclined plates are arranged on the outer walls of the tops of the supporting columns, rain baffles are arranged on the outer walls of the tops of the inclined plates, connecting plates are arranged on the outer walls of one sides of the supporting columns, and temperature sensors are arranged on the outer walls of one sides of the connecting plates. According to the invention, the temperature sensors, a fixing rod, a fixing plate, a second cooling fan, a first cooling fan, a semiconductor heating sheet and a semiconductor refrigerating sheet are arranged, the temperature sensorsdetect the temperature value around the device, if the detected temperature is higher than the temperature, the processor can act on the first cooling fan and the semiconductor chilling plate, the first cooling fan is of an inclined structure, cold air generated by the semiconductor chilling plate can be blown upwards, and heat generated by the transformer body is exhausted upwards.

There is provided a transformer including cores combined with a bobbin wound with coils, and center leg parts extended from the cores and contacting each other by being inserted into both ends of the bobbin, wherein stress dispersion hole, dispersing stress occurring according to temperature variations around the cores, is formed at the edge of center leg connection parts of the cores from which the center leg parts are extended.

The invention relates to a method of measuring the temperature of a coiled component comprising the injection of a known DC current into a gauge wire (1) made of resistive material, the resistance of the gauge wire varying with temperature according to a known law, the measurement of potential difference between the terminals (7a, 7b) of said gauge wire, and a step of calculation transforming the potential difference into a mean temperature of the gauge wire, said gauge wire (1) being wound inside the coil, and arranged as a series of “outbound” turns (5) and a series of “inbound” turns (6) associated pairwise with a geometry and a position that are substantially equal. It also relates to a component made in order to be able to implement this method and the measurement device as a whole.

A dry-type transformer heater includes a closed housing, and at least one transformer winding arranged in the housing. The at least one transformer winding includes at least one corresponding winding conductor and a corresponding insulation layer surrounding the transformer winding, respectively. In addition to the respective winding conductor, at least one coil heating wire is provided in at least one of the insulation layer and on the surface of the insulation layer to input thermal power into the respective insulation layer.

The invention discloses a dehumidification type pole-mounted transformer suitable for the severe cold area. The transformer comprises a shell, a sliding plug cavity is formed in the upper end of the shell, a magnetic sliding plug is connected to the inner wall of the sliding plug cavity in a sealed and sliding mode, the side wall of the magnetic sliding plug is elastically connected with the innerwall of the sliding plug cavity through a liquid storage bag, and a strip-shaped cavity is formed in the lower end of the shell. The inner wall of the strip-shaped cavity is fixedly connected with apartition plate, the interior of the strip-shaped cavity is equally divided into a cooling cavity and a heating cavity through the partition plate, and the inner wall, away from the liquid storage bag, of the sliding plug cavity is fixedly connected with the inner wall of the liquid storage bag through a return pipe. The magnetic fluid continuously flows in the return pipe, so that the magnetic fluid releases heat and absorbs heat in the heating cavity and the cooling cavity respectively, water vapor in gas entering the cooling cavity is liquefied when meeting cold, then the liquefied gas canbe heated by the heating cavity, and the heated gas enters the shell again; and the temperature in the shell is increased, so that the temperature in the shell is increased, and moisture in the shellis removed.

Disclosed herein is a heat exchange type cooling apparatus for a transformer, including: an insulating oil circulation pipe configured in a closed circuit form so that an insulating oil filled in the transformer is discharged to the outside and then returns again to the transformer; an insulating oil pump configured to transfer the insulating oil; and an insulating oil cooling system configured to cool the insulating oil, wherein the insulating oil cooling system includes: a liquid refrigerant maintained in a liquid state during the entire circulation cycle; a refrigerant circulation pipe configured to circulate the liquid refrigerant; a refrigerant pump configured to transfer the liquid refrigerant; and a heat exchanging part configured to heat-exchange the liquid refrigerant and the insulating oil with each other to cool the insulating oil.

The invention discloses a heat preservation method and system for a converter transformer. The heat preservation system of the converter transformer comprises a converter transformer body; the outer surface of the converter transformer body is coated with the double-layer thermal insulation material; wherein the double-layer thermal insulation material comprises first fireproof thermal insulation cotton and second fireproof thermal insulation cotton; the outer surface of the converter transformer body is coated with the first fireproof thermal insulation cotton; and the sealed heat preservation shed is packaged on the outer side of the fireproof heat preservation cotton. According to the technical scheme, the problem that in the prior art, under the condition that the external environment temperature is low, the outlet oil temperature of the converter transformer body cannot reach the specified technical index easily is solved.

A method for controlling cooling system of a power equipment and a system using the same. The method includes steps of: obtaining a first data set representing operational cost related parameters specific to the power equipment and its cooling system at a series of time intervals of a first load cycle in a history profile; obtaining a second data set representing operational cost related parameters specific to the power equipment and its cooling system at a series of time intervals of a second load cycle in the history profile, where the second load cycle follows the first load cycle; in consideration of the parameters represented by the first data set, through knowledge-based predetermined numerical and/or logical linkages, establishing a third data set representing optimal cooling capacity parameters for the cooling system at the series of time intervals of the first load cycle according to criteria for operational cost optimization of the power equipment; in consideration of the parameters represented by the second data set, through knowledge-based predetermined numerical and/or logical linkages, establishing a fourth data set representing optimal cooling capacity parameters for the cooling system at the series of time intervals of the second load cycle according to criteria for operational cost optimization of the power equipment; establishing a fifth data set representing a cooling capacity parameter difference between the established cooling capacity parameters concerning the first load cycle and the second load cycle; establishing a sixth data set representing cooling capacity parameters for the cooling system at a series of time intervals of a present load cycle by computationally correcting the established cooling capacity parameter concerning the time intervals of the second cycle load with use of the cooling capacity parameter difference; and controlling the cooling system to operate at a series of time intervals of the present load cycle at the stablished cooling capacity parameters concerning the present load cycle represented by the sixth data set.