680results about "Resistor details" patented technology

The invention provides a carbon ceramic resistor and a preparation method thereof, and relates to the technical field of special material production of power systems and electrical equipment. The preparation method comprises the steps that carbon-containing electric conductor raw materials are mixed to obtain a first mixed raw material, and the carbon-containing electric conductor raw materials comprise, by mass, 15 parts of gluconic acid, 10 parts of aluminum oxide and 55 parts of deionized water; performing hydrothermal reaction on the first mixed raw material to obtain a carbon-containing conductor precursor; the carbon-containing conductor precursor is carbonized in a protective atmosphere, a carbon-containing conductor of a core-shell structure is obtained, and the carbon-containing conductor takes aluminum oxide as an inner core and takes a conductive carbon material formed by gluconic acid as a conductive outer shell; mixing the carbon-containing electric conductor with the core-shell structure with a carbon ceramic matrix raw material to obtain a resistor blank; and sintering the resistor blank to obtain the carbon ceramic resistor. The uniformity, the stability and the reliability of the carbon ceramic resistor are improved, so that the carbon ceramic resistor can better meet the application requirements of ultrahigh-voltage and extra-high-voltage alternating-current power transmission systems.

An air cooled resistor arrangement comprising a first elongated tube member forming a first air flow channel and a second elongated tube member forming a second air flow channel, wherein the first elongated tube member is at least partly housed inside the second elongated tube member. The air-cooled resistor arrangement further comprises an air dilution portion comprising at least one opening at which the first air flow channel is arranged in fluid communication with the second air flow channel.

A multilayer varistor has a stack structure including a plurality of layers stacked in a third direction. The multilayer varistor includes a first internal electrode electrically connected to a first external electrode, a second internal electrode electrically connected to the second external electrode, and a third internal electrode electrically connected to the third external electrode. The first internal electrode is disposed between the second internal electrode and the third internal electrode in the third direction.

A sintered body has a first end face and a second end face opposite to each other in a first direction and a first side face and a second side face opposite to each other in a second direction. A first end face electrode is disposed on the first end face except for end portions of the first end face in the second direction. A second end face electrode is disposed on the second end face except for end portions of the second end face in the second direction. A first side face electrode is disposed on the first side face except for end portions of the first side face in the first direction. A second side face electrode is disposed on the second side face except for end portions of the second side face in the first direction.

A manufacturing method for a heavy-load 10kV lightning arrester having a large flowing current, the method comprising: performing a direct-current reference voltage test on valve blocks to be selected, so as to obtain a target valve block, the target valve block meeting the following conditions: the large-current surge tolerance capacity is greater than or equal to 100kA, the flowing current capacity is greater than 600A, the residual voltage under a 10kA flowing current is less than or equal to 45kV, and the repeat transfer charge capacity is greater than or equal to 0.8C; and assembling a fiberglass epoxy resin layer and an electrode pair into a sealed housing, such that the target valve block is located in a chamber of the sealed housing, and the target valve block is separately and electrically connected to a first electrode of the electrode pair and a second electrode of the electrode pair so as to form a heavy-load 10kV lightning arrester having a large flowing current. The problems of frequent faults of lightning arresters in the prior art are solved.

Provided are a thin-film resistor and a circuit board. The thin-film resistor comprises a substrate layer and a first resistor layer, wherein at least one side surface of the substrate layer has several protrusions; the first resistor layer is located on the side surface of the substrate layer that has the protrusions; the ratio of the surface area of the side surface of the substrate layer that has the protrusions to the projection area of the substrate layer is 1.3-10; and the first resistor layer is located on the side surface of the substrate layer that has the protrusions, and is configured in the same shape as the substrate layer. The above definitions improve the uniformity of the first resistor layer deposited on a surface of the substrate layer, thereby improving the sheet-resistance uniformity of the first resistor layer, facilitating the preparation of an embedded resistor having relatively high precision, and facilitating the performance of a circuit board and even an electronic element.

The invention relates to a zinc oxide lightning arrester and a transformer substation, and relates to the technical field of lightning arresters, the zinc oxide lightning arrester comprises a silicone rubber jacket, a plurality of umbrella skirts fixedly arranged on the peripheral surface of the silicone rubber jacket, and sealing fittings for blocking openings at two ends of the silicone rubber jacket, and the silicone rubber jacket is internally provided with a plurality of resistance valve plates; an insulating sleeve arranged outside the resistance valve plate in a sleeving mode is arranged in the silicone rubber outer sleeve, a rainproof cap made of silicone rubber is arranged on the periphery of one end of the silicone rubber outer sleeve in a sleeving mode, and the inner wall of the rainproof cap abuts against the peripheral face of the silicone rubber outer sleeve; when the zinc oxide lightning arrester is installed in an outdoor severe environment along the vertical direction, the protective cap can be used for protecting the upper end of the zinc oxide lightning arrester in advance, so that the waterproof and moisture-proof performance of the zinc oxide lightning arrester is improved; when the lightning arrester is transported for a long distance, the two protective shells are detachably arranged outside the silicon rubber jacket, so that the possibility that the silicon rubber jacket is damaged in the transportation process is reduced.

The invention relates to a metallization layer for a PTC semiconductor ceramic for at least partially coating the surface of the PTC semiconductor ceramic, which contains at least one functional layer, wherein the at least one functional layer serves for current distribution, wherein the porosity of the at least one functional layer is less than 5%, as well as a method for applying the metallization layer to a PTC semiconductor ceramic, a PTC thermistor which has this metallization layer, and the use thereof.

A preparation method of a polymer-derived high-temperature ceramic thin film sensor is provided. Specifically, a sensitive layer precursor layer is prepared by spraying a sensitive layer precursor liquid on an alumina substrate, and the sensitive layer precursor liquid is obtained by mixing precursor liquid with conductive powder. A protective layer precursor liquid is prepared by spraying protective layer precursor liquid on the sensitive layer precursor layer, and the protective layer precursor liquid is obtained by mixing TiB2 nano-powder, insulating powder and the precursor liquid. The protective layer precursor layer, a solder and the sensitive layer precursor layer are simultaneously pyrolyzed by a one-time pyrolysis process, and thus a protective layer, the solder joints and the sensitive layer are obtained simultaneously. Thus, there is no need to pyrolyze the sensitive layer first, saving the time for pyrolyzing the sensitive layer.

One aspect relates to a high-temperature sensor, having a coated substrate. The substrate contains a zirconium oxide or a zirconium oxide ceramic, at least one resistance structure and at least two connection contacts. The connection contacts electrically contact the resistance structure. The substrate is coated with an insulation layer. The insulation layer contains a metal oxide layer, the resistance structure and the free regions of the insulation layer, on which no resistance structure is arranged, are coated at least in regions with a ceramic intermediate layer, and a protective layer and / or a cover is arranged on the ceramic intermediate layer. At least one opening is formed in the insulation layer, which exposes at least sections of a surface of the substrate.

The present invention relates to a current sensing resistor (1) for measuring a current (I), the current sensing resistor (1) comprising two connection members (2, 3), a resistive element (4), a pair of voltage sensing contacts (8-19) for measuring a voltage drop across the resistive element (4), and at least one notch (20) in at least one of the connection members (2, 3), the notch (20) surrounding the voltage sensing contacts (8-19) and preventing current from flowing beyond the notch (20). The present invention provides a plurality of pairs of voltage sensing contacts (8-19) arranged in series in the direction of current flow.

A frame terminal 8 is bent so that its cross-sectional shape is an S-shape, and such that separation distances L1, L2 and L3 in a horizontal direction between an uppermost portion and a lowermost portion, in the vertical direction, of an end portion side face 21a of a resistance element 8 built into a mold divider 1, and a part substantially midway between an uppermost point and a lowermost point thereof, and the parts of the surface of the frame terminal 6 that correspond to these parts in the horizontal direction satisfy the relation L1>L2≥L3. As a result, in the mold divider 1, a space which is to be filled with a joining material and which has a non-uniform separation distance is formed between the frame terminal 6 and the end portion side face 21a, thereby making it possible to ensure the bonding strength between the resistance element 8 and the frame terminal 6.

An energy dissipation system for a vehicle, the energy dissipation system comprising an air compressor comprising a compressor inlet configured to receive ambient air, an electric motor comprising a rotor having a rotor shaft operatively connected to a compressor shaft of the air compressor, power electronics arranged in a power electronics housing, the power electronics being electrically connected to the electric motor and configured to feed electric power to the electric motor, and an air flow channel through which the ambient air is configured to be fed to the compressor inlet, the air flow channel being formed by an inner elongated tube member and an outer elongated tube member, wherein the electric motor is housed within the inner elongated tube member and attached to a first inner surface, and wherein the power electronics housing is attached to a second outer surface.

The invention discloses an overvoltage protection combined lightning arrester of a power system. The overvoltage protection combined lightning arrester comprises an insulating cylinder, a lower fixing part, a lower electrode, a resistor body, an end cover, an upper fixing part and an upper electrode, the lower fixing part is fixed to the lower end of the insulating cylinder in a sealed mode, the lower electrode is connected to the upper end of the lower fixing part, the resistor body is connected to the upper end of the lower electrode, the end cover is sealed and installed at the upper end of the insulating cylinder through threads, the upper fixing part is fixed to the upper end of the end cover in a sealed mode, and the upper electrode is connected to the lower end of the upper fixing part; the device further comprises an inner sealing cylinder, an outer sealing cylinder, a heat conduction mechanism and a pneumatic mechanism. The inner sealing cylinder is arranged on the periphery of the resistor body, the upper end and the lower end of the inner sealing cylinder are in movable contact with the end cover and the inner wall of the insulating cylinder respectively, the outer sealing cylinder is in movable contact with the inner wall of the insulating cylinder, the heat conduction mechanism is arranged in the inner sealing cylinder, and the pneumatic mechanisms are circumferentially arranged and are arranged between the inner sealing cylinder and the outer sealing cylinder respectively.

An overvoltage protection device module includes an electrically conductive first electrode, an electrically conductive housing electrode, and a varistor member formed of a varistor material and electrically connected between the first electrode and the housing electrode. The housing electrode includes a housing end wall and a housing side wall collectively defining a housing cavity, and first and second housing members joined together at a joint. The first housing member forms a first portion of the housing side wall and the second housing member forms a second portion of the housing side wall. The varistor member is disposed in the housing cavity.

The invention relates to an electronic component for measuring an electric current, comprising a code applied to a terminal element, characterized in that the terminal element has a raised area on which the code is applied. It further relates to a printed circuit board suitable for connection to such an electronic component and to a measuring arrangement comprising such an electronic component.

An over-current protection element comprises an electrode layer and a thermistor layer. The electrode layer has an upper metal layer and a lower metal layer. The thermistor layer contacts the upper metal layer and the lower metal layer and is stacked between the upper metal layer and the lower metal layer. The thermistor layer has a positive temperature coefficient characteristic and contains a high-molecular polymer base material and a conductive filler. The high-molecular polymer base material contains a fluorine-containing polymer, the fluorine-containing polymer has a plurality of spherocrystals, and the fractal dimension of the surface of each spherocrystal is lower than 12.

The present invention relates to a resistor unit (1, 1', 1''), comprising: at least one electrical resistor (10), at least one fluid-carrying cooling unit (30) on and / or in which at least part of the at least one electrical resistor (10) is arranged, at least one detection unit (3, 4, 5, 6, 7, 71, 72) and at least one evaluation device (40) that can be operatively connected to the at least one detection unit (3, 4, 5, 6, 7, 71, 72), the at least one detection unit (3, 4, 5, 6, 7, 71, 72) being configured to measure a variable that represents the temperature (TR) of the at least one electrical resistor (10) per se or in combination with a further detection unit (3, 4, 5, 6, 7, 71, 72) and that relates to an electrical property of the at least one electrical resistor (10) and / or to a property of a fluid flowing through the fluid-carrying cooling unit (30). The present invention additionally relates to a brake system and to a vehicle having such a resistor unit and to a method for estimating a temperature of the fluid-cooled electrical resistor.

The utility model discloses an overvoltage protection assembly and system formed by voltage-sensitive nonlinear elements. The assembly comprises an insulating core tube, a plurality of nonlinear elements, a first electrode, a second electrode, an insulating cylinder, a cooling fan and a temperature sensor. The assembly can perform forced air cooling on the nonlinear element, and is timely in response, good in cooling effect, simple and compact in structure and easy to integrate.

The utility model relates to the technical field of high-voltage transmission lines, in particular to a lightning arrester with a protection structure, which comprises a lightning arrester component, a protection component is mounted at the top of the lightning arrester component, and a first explosion-proof component and a second explosion-proof component are mounted at the bottom of the lightning arrester component. The lightning arrester assembly comprises a lightning arrester body, a first wiring terminal is installed at the top of the lightning arrester body, an installation cross arm is installed on the outer wall of the bottom of the lightning arrester body, a disconnector is installed at the bottom of the lightning arrester body, and a second wiring terminal is installed at the bottom of the disconnector. According to the improved lightning arrester, the protection assembly is adopted, so that the situation that when the lightning arrester is used, water and dust are accumulated at the joint of the first wiring terminal and the lightning arrester body, and use of the lightning arrester is affected can be prevented; and the first explosion-proof assembly and the second explosion-proof assembly are adopted, so that when the lightning arrester is used, fragments generated by explosion of the disconnector can be prevented from hurting surrounding people and equipment.

The utility model relates to the technical field of brake electric boxes, in particular to a protective kit for a brake resistor box, which is arranged at the end of a resistor, the end of the resistor is provided with a mounting portion, one end of the mounting portion close to the resistor protrudes to form a limit portion, and the periphery of the mounting portion is provided with external threads. The protective sleeve comprises a fixing nut, a first anti-explosion fixing part and a second anti-explosion fixing part, the fixing nut is in threaded connection with the mounting part, a gap for mounting the support is formed between the fixing nut and the limiting part, the first anti-explosion fixing part is in threaded connection with the mounting part, the first anti-explosion fixing part wraps the mounting part, and the second anti-explosion fixing part wraps the mounting part. The fixing nut is located between the first anti-explosion fixing piece and the limiting part, the first anti-explosion fixing piece and the second anti-explosion fixing piece are in threaded connection, all parts which possibly generate sparks, electric arcs and dangerous temperature are sealed in the box body, the sealing performance is improved, the safety protection effect is achieved, and the use safety of the brake resistance box is improved.

The invention relates to the technical field of loads, in particular to a stirring type high-heat-exchange-efficiency water-cooling load which comprises a barrel and a plurality of resistance tubes, the barrel comprises a barrel body and a barrel cover which jointly define a containing cavity, and a partition plate is arranged in the containing cavity so that the containing cavity can be divided into an upper cavity and a lower cavity; the lower cavity is communicated with a water inlet pipe which is provided with a water inlet valve; the upper chamber and the lower chamber are communicated through a transition pipeline, and the transition pipeline is provided with a middle valve; the upper chamber is communicated with a water outlet pipe which is provided with a water outlet valve; a cleaning pipe communicated with the lower cavity is further arranged in the upper cavity, and a plurality of cleaning holes facing the resistance tube are formed in the side wall of the cleaning pipe; a blow-off pipe is arranged on the lower portion of the upper cavity and provided with a blow-off valve. During normal use, the hydrodynamic turbine drives the cleaning pipe and the stirring pipe to stir water in the upper chamber through flowing rotation of water flow, so that heat exchange between the resistance tube and cooling water is accelerated, and heat exchange of flowing dead angle water in the upper chamber is also accelerated.

This ceramic substrate is provided with a base material that contains a sintered body of ceramic particles and a coating that contains a sintered body of alpha-alumina particles. The coating covers at least a part of the surface of the base material. The average particle diameter of the alpha-alumina particles is smaller than the average particle diameter of the ceramic particles.

The utility model discloses a heat dissipation structure of a variable frequency resistance box, which relates to the technical field of resistance boxes, and comprises a box body, a box door and a top cover, one side of the box door is hinged with the box body, and the top cover is fixedly connected to the top of the box body; the heat dissipation structure comprises a box body, the two sides of the box body are each provided with a heat dissipation window, two installation plates are fixedly connected to the interior of the box body and distributed at the top and the bottom of the inner side of the box body, and a heat dissipation structure for conducting heat dissipation on a resistor is arranged between the two installation plates. In the process that equipment is installed in the box body, main resistor elements are arranged between the two fixing rings, when the resistor elements operate, heat can be generated, the part of heat is guided into the heat absorption plate, then the heat absorption plate transmits the heat to the heat absorption copper pipe, heat dissipation is carried out by means of a liquid medium in the heat absorption copper pipe, and the heat dissipation efficiency is improved. The heat-absorbing copper pipe and the heat-absorbing plate are both designed into a cylindrical structure, so that the heat-absorbing copper pipe and the heat-absorbing plate are closer to a resistor element, thereby improving heat dissipation efficiency.

The present invention provides a load cabinet for EMC testing, comprising the following structures: a cabinet body; an air intake guide sleeve, a cover shell is provided on the top of the air intake guide sleeve, a transition pipe is fixedly provided in the middle of the rear end of the cover shell, the left and right sides of the rear end of the cover shell are respectively fixedly connected to the left and right sides of the truss, the blocking structure formed by the guide pipe and the windproof film facilitates the air volume generated by the axial flow fan and the cross-flow fan when working to perform forced air cooling and heat dissipation treatment on the resistors in the working state in the resistor array as much as possible, the guide pipe and the air guide hole cooperate to introduce hot air into the transition pipe, the external pipe and the exhaust fan cooperate to timely extract the hot air in the transition pipe through the exhaust pipe, the device realizes layered heat dissipation treatment according to the calling situation of the resistor array, and at the same time effectively drains the hot air in the cabinet to avoid heat accumulation in the cabinet and temperature abnormality affecting the working stability of the load cabinet.

The utility model relates to a standardized gap lightning arrester with an insulation support and a fault indication function, which comprises a standardized gap lightning arrester body, the insulation support is mounted at the lower end of the standardized gap lightning arrester body, a disconnector is mounted at the lower end of the insulation support, and a second screw is mounted at the tail end of the disconnector. A mounting hole is formed in one side, far away from the lower end of the standard gap lightning arrester body, of the insulating bracket, the mounting hole in the insulating bracket is connected with the mounting hole in the metal bracket through a first screw, and a second screw at the tail end of the disconnector is connected with the first screw at the joint of the insulating bracket and the metal bracket through a copper wire woven belt. According to the utility model, the disconnector, the insulating bracket and the metal bracket are arranged on the standard gap lightning arrester body, so that when the lightning arrester is broken down by lightning stroke, the disconnector falls off and forms a fault mark, operation and maintenance personnel can easily find a fault point and can carry out targeted maintenance, and meanwhile, due to the insulating bracket, secondary accidents can be avoided.

This chip resistor is provided with a ceramic substrate, two electrodes that are disposed on the ceramic substrate, and a resistor that electrically connects the two electrodes. The ceramic substrate comprises a base material that contains a sintered body of ceramic particles (A) and a covering that contains a sintered body of α-alumina particles (B). The covering covers at least a part of the surface of the base material. The average particle diameter of the α-alumina particles (B) is smaller than the average particle diameter of the ceramic particles (A). The ceramic substrate has a support surface, the support surface-side surface of the base material is covered with the covering, and the resistor overlaps the support surface.

To provide a multilayer ceramic electronic component capable of achieving an improvement in deflection resistance.SOLUTION: A multilayer ceramic electronic component includes a laminate 10 including an internal electrode layer 30, and a pair of external electrodes 40 disposed on both ends of the laminate 10. The external electrodes 40 each include a main surface side external electrode 411A, and the main surface side external electrode 411A has a surface 411sA facing a main surface TS. The surface 411sA includes a step portion 900 that lowers the height of the surface 411sA, of the laminate 10, on a center side in a length direction L than that of the surface 411sA of the laminate 10 on the outside in the length direction L, in the height from the main surface TS to the surface 411sA. The step portion 900 has a shape curved convexly toward the center in the length direction L and extends across a width direction W at the surface 411sA.SELECTED DRAWING: Figure 2

A method for applying a coating to at least one electronic component is described comprising the following steps: A) Providing a coating arrangement (1) comprising a coating roller (2), wherein the coating roller (2) is rotatable around a rotation axis (R); B) Providing a coating material (3) on the coating roller (2); C) Providing at least one electronic component (10); D) Moving the at least one electronic component (10) along the rotating coating roller (3) to obtain a coating (12) of at least a part of the electronic component (10). Moreover, a coating arrangement (1) for applying a coating (12) to at least one electronic component (10) is described.

An overvoltage protection apparatus (14) has at least one isolator apparatus (38) which is provided in a housing (50), a thermally conductive element (40), an operating element (42) for operating an indicator apparatus (44), and a locking element (58), wherein the thermally conductive element (40) is in contact with the housing (50). The operating element (42) is attached to the thermally conductive element (40) by means of the locking element (58) and the attachment is formed in such a way that the locking element (58) becomes detached from the thermally conductive element (40) and / or from the operating element (48) and releases the operating element (42) when a predetermined temperature at the locking element (58) is exceeded. The invention further discloses a modular overvoltage protection system (10).