92results about "Other resistor networks" patented technology

The invention relates to the technical field of rail transit vehicle power supply protection, in particular to a vehicle-mounted lightning arrester which comprises a body, a base, a sealing cavity, a flow guide passage and a restraint mechanism, and when pressure in the sealing cavity reaches the opening condition of a pressure relief opening and under the action of directional jet flow formed by a jet opening, the body is separated from a limiting piece; and the rotating shaft rotates towards the off-position direction around the rotating supporting part. According to the application, destructive voltage breakdown is taken as an action power source, gas is generated and rapidly expanded due to electric arc during breakdown of the sealing cavity in the body, after the cavity pressure rises to a set threshold value, the pressure relief opening with the pressure opening characteristic is selectively opened, and expanded gas is directionally discharged from the spraying opening along the flow guide passage; the offset of the spraying port relative to the rotary supporting part converts the spraying momentum into a dumping moment to the body, so that the body is quickly and certainly switched to the off position from the working position under the condition of no additional operation, the electric connection interruption with the high-voltage conductor is formed, and the risk of secondary pressurization of the reclosing is reduced.

The application provides a double-row lead frame resistance. The double-row lead frame resistance comprises a lead frame, a resistance, and the two ends of the first coil and the second coil are respectively installed with the lead wires; a protective cover; a cooling mechanism, the inside of the protective cover is fixedly connected with the supporting rod, the bottom end of the supporting rod is installed with the air bag; the top end of the supporting rod is internally installed with the fixed block and the fixed frame, the inside of the fixed block is slidably connected with the piston, the inside of the piston and the fixed block is respectively installed with the magnetic ring, the magnetic rings are attracted to each other; the inside of the fixed frame is slidably connected with the sliding rod, the sliding rod is fixedly connected with the piston, the side wall of the sliding rod is sleeved with the spring, and the two ends of the spring are respectively connected with the fixed frame and the piston; a cooling mechanism; a connecting mechanism. The double-row lead frame resistance provided by the application has the advantages of eliminating the self-induction of the coil, reducing the eddy current, and facilitating the dissipation of the heat inside the coil.

The application relates to an overcurrent-preventing resistor, which comprises a shell and a resistance coil, the bottom of the shell is internally provided with a bobbin and externally provided with a first pin and a second pin, the resistance coil is electrically connected to the first pin and the second pin, the resistance coil is sleeved on the bobbin and electrically insulated from the bobbin, the bobbin is internally provided with a magnetic piece, the magnetic piece is in sliding connection with the bobbin, the magnetic poles of the magnetic piece are distributed along the axis of the bobbin, the magnetic piece is electrically connected with the bobbin, the top of the inside of the shell is provided with an electric contact opposite to the bobbin, the top of the outside of the shell is provided with an indicating lamp electrically connected with the electric contact, and the inside of the shell is provided with a wire for electrically connecting the second pin. The application has the functions of quickly determining overcurrent in a laboratory and giving a warning.

The invention provides a lightning arrester core fixed based on an insulating rod and an assembly method thereof, which are used for solving various problems of a traditional metal oxide lightning arrester core. According to the lightning arrester core body fixed based on the insulating rods, the first groove and the second groove are matched and clamped with the Y-shaped clamping heads at the two ends of the insulating rods, and the core body is fixed through the plurality of insulating rods, so that the additional arrangement of structures such as an insulating cylinder is avoided, and the volume of the lightning arrester core body is reduced; meanwhile, the axial displacement of the insulating rod in the assembling and using processes is effectively avoided, so that the close contact among a plurality of resistor discs is ensured; compared with the prior art, the resistor discs pressed in a Y-shaped clamping mode are higher in stability, the plurality of resistor discs are in closer contact and do not generate gaps, and when the outer sides of the resistor discs are directly wrapped with the rubber jackets, rubber is not prone to permeating into the space between every two adjacent resistor discs.

The invention relates to the technical field of lightning arresters, and discloses a vehicle direct current lightning arrester with a built-in separation device, the vehicle direct current lightning arrester comprises an outer sleeve and a core body, the core body comprises an insulating tube, an electrode is arranged in the insulating tube, the electrode divides the interior of the insulating tube into an upper cavity and a lower cavity, the upper cavity is provided with a functional module, the functional module is used for realizing an overvoltage protection function, and the lower cavity is provided with a power supply. A separating device is arranged in the lower cavity and located on the upper portion of the lower cavity, a connecting hole communicated with the lower cavity is formed in the core body, a grounding end is arranged in the connecting hole, and the grounding end is connected with the separating device; according to the lightning arrester, when the insulating property of the upper cavity is completely lost due to a short-circuit fault, the accurate and reliable action of the separating device of the lower cavity can still be ensured when the fault occurs, the disconnection of a circuit is realized, the insulating property of the lower cavity can be kept after the action, and the risk of a secondary fault is avoided; as the disengagement device is limited in the lightning arrester, the adverse effect of scattered objects generated when the external disengagement device acts on the vehicle can be avoided.

A high-power direct-current load cooling method based on variable modular combination comprises the steps that a high-power load is divided into a plurality of resistor modules, resistor load bodies of the resistor modules are sealed and then placed in an independent cooling water tank, and then the independent cooling water tank is placed on a supporting frame in an overall resistor cabinet; the water inlets and the water outlets of the independent cooling water tanks are arranged in series according to a thermal sequence through cooling water pipes to form independent cooling water tank groups, cooling water sequentially flows through all the independent cooling water tanks, heat of the resistor modules in the independent cooling water tanks is taken away in a layered mode, and cooling and heat dissipation are conducted on resistor loads of the resistor modules. High-power direct-current loads are modularized and then are respectively arranged in the independent water-cooling box bodies, and all the independent water-cooling box bodies are connected in series through the cooling water pipes, so that cooling water flows through each independent water-cooling box body according to a rule, and cooling of each resistor module can be effectively controlled; the high-power direct-current load can be well cooled in various selection modes.

In one example, an apparatus comprise: a first power stage having a first power stage input and a first power stage output; a second power stage having a second power stage input and a second power stage output; a driver circuit having a first driver input, a second driver input, a first driver output, and a second driver output, the first driver output coupled to the first power stage input, and the second driver output coupled to the second power stage input; a first resistor network coupled between a first input of a pair of differential inputs and the first power stage output, the first resistor network including a trimmable resistor network and a trim input; a second resistor network coupled between a second input of the pair of differential inputs and the second power stage output; and a control circuit having a trim output coupled to the trim input.

A micromechanical piezoresistive pressure sensor (40;340) includes a diaphragm (44) configured to mechanically deform in response to an applied load, a sensor substrate located on the diaphragm, and a number of piezoresistive resistance devices located on the sensor substrate. The piezoresistive resistance devices are arranged in a first planar array defining a grid pattern having two or more rows, each row being aligned in a first direction. The piezoresistive resistance devices are configured to be electrically connected in a number of bridge circuits (30), whereby the piezoresistive resistance devices in each row is electrically connected in an associated bridge circuit. A method of using the micromechanical piezoresistive pressure sensor is also disclosed.

The application provides a fusible resistor and a manufacturing method thereof, comprising a pressure-divided rod, the outer wall of the pressure-divided rod is provided with a notch, the both ends of the pressure-divided rod are tin soldered with a cap, the outer wall center of each cap is provided with a lead positioning piece, the inside of each lead positioning piece is penetrated by a lead, and the inner end of the lead is tin soldered with the cap; the outer wall of the pressure-divided rod and the cap is sprayed with an insulating protective layer; the manufacturing method comprises the following steps: selecting a pressure-divided rod; notching the pressure-divided rod; firmly welding the lead and the cap together; uniformly coating the outer wall of the pressure-divided rod and the cap with an insulating protective layer; and marking a color ring on the outer surface of the insulating protective layer. The application releases the impact force in the moment of fusing by adjusting the film-forming structure of the coating, so as to achieve the effect of preventing the coating from being broken and preventing fire; the pressure-divided rod is selected to be a pulse-resistant pressure-divided rod, so that the resistor can meet the pulse and be fused under the specified voltage; the resistor is convenient to manufacture, simple in structure, low in price and low in production cost.

The utility model relates to the technical field of resistors, in particular to a column-type wire-wound resistor, which comprises a first disc body and a second disc body which are arranged in parallel at intervals, and a first support column is arranged between the first disc body and the second disc body; a plurality of insulated supporting plates are arranged on the opposite side portions of the first disc body and the second disc body in the circumferential direction at intervals. Each supporting plate is provided with a plurality of threading rings which are arranged at intervals in the length direction of the supporting plate. The flexible resistance wire alternately bypasses the threading rings of the supporting plates of the first disc body and the second disc body, the resistance wire is arranged in a plurality of wave shapes, and the plurality of wave shapes are distributed in the length direction of the supporting plates; and two adjacent wave crests are arranged in a staggered manner in the length direction of the supporting plate. Compared with the prior art, the heat dissipation effect is good, the two adjacent wave-shaped wave crests are arranged in the length direction of the supporting plate in a staggered mode, the mutual heating influence of the resistance wires is reduced through the inner and outer adjacent staggered mode, meanwhile, the inductance can be reduced, and even the non-inductance effect can be achieved.

The utility model relates to the technical field of loads, in particular to a water-cooling load capable of preventing scale accumulation, 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 as to divide the containing cavity into an upper cavity and a lower cavity; the plurality of resistance tubes are fixed on the cylinder cover in parallel and are inserted into the upper 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. The load can realize uniform cooling and heat dissipation, prolongs the service life of the resistor, has a scale cleaning function, can regularly clean scale, improves the stability of the water-cooling load, and prolongs the service life of the water-cooling load.

The present application provides a breaker box system, a power supply system, and a vehicle. The breaker box system comprises a plurality of breaker boxes, the plurality of breaker boxes not sharing a ground. Each breaker box comprises a housing, a battery cell, and an insulation detection assembly, the battery cell and the insulation detection assembly being disposed in the housing. One end of the insulation detection assembly is connected to a positive electrode of the battery cell, the other end is connected to a negative electrode of the battery cell, and a reference ground of the insulation detection assembly is the housing of the breaker box. The embodiments of the present application, by having the plurality of breaker boxes not share a ground, by providing in each breaker box an insulation detection assembly corresponding thereto, and by each insulation detection assembly being used for insulation detection of the corresponding breaker box, achieves the insulation detection of each breaker box not affecting one another, and achieves insulation detection of each breaker box.

The present invention provides a composite substrate and a circuit board. The composite substrate includes a first resistance layer and a base layer. The first resistance layer is laminated on at least one surface of the base layer. The surface of the base layer facing the first resistance layer has a plurality of protrusions. The surface roughness Ra of the base layer having the protrusions is 0.5 μm to 5 μm, and the number of protrusions is 0.1×10 3 pieces / mm to 3×10 3 pieces / mm. Due to the above limitations, the uniformity of the first resistance layer deposited on the surface of the base layer is improved, thereby improving the sheet resistance uniformity of the first resistance layer, which is useful for the manufacture of high-precision embedded resistors and beneficial to the performance of circuit boards and even electronic components.

The utility model discloses an internal winding resistor, which particularly relates to the technical field of resistors and comprises an insulating rod, a notch groove is arranged on the outer surface of the insulating rod, a resistor winding is arranged in the middle of the notch groove, iron caps are symmetrically sleeved at two ends of the insulating rod, a sealing ring is arranged on one side of each iron cap, and a groove is arranged on the other side of each iron cap. The side, close to the groove, of the iron cap is fixedly connected with a wire, and the insulating rod is sleeved with an insulating cylinder. According to the utility model, the groove matched with the resistor winding wire is arranged in the iron cap, so that when the iron cap is sleeved at two ends of the insulating rod, the iron cap is tightly attached to the resistor winding wire, and the iron cap can only rotate to be separated from the insulating rod through the matching of the resistor winding wire and the groove, but the iron cap can only rotate through the anti-skid groove on the surface of the iron cap; according to the iron cap, the attaching strength of the iron cap and the insulating rod can be improved after the insulating coating is arranged, the iron cap is prevented from rotating, and therefore the iron cap cannot be loosened when the iron cap is extruded.

The application discloses a kind of temperature control thick film resistance and its production process in the technical field of thick film resistance electric auxiliary heating, to solve the problem of existing thick film resistance product in use process inadaptation of heating power to use environment.It includes substrate, working resistance film layer and auxiliary heating resistance film layer are arranged on the substrate, a plurality of first adapter terminals are arranged on the substrate for connecting working resistance film layer, and a plurality of second adapter terminals are arranged for connecting auxiliary heating resistance film layer, positive electrode circuit and negative electrode circuit are further arranged on the substrate, a plurality of parallel branches are arranged between positive electrode circuit and negative electrode circuit, a resistor and a temperature control switch are arranged in series on each parallel branch;The application is used to automatically control different heating power in complex environment, so as to maintain the temperature stability of thick film resistance as much as possible in different environments, thereby reducing the influence of temperature on its own performance, protecting service life and use effect.

The invention discloses a hot melting self-protection resistor and a production method thereof, and the production method comprises the following steps: controlling a welding mechanism to weld a first protection sheet and a connecting sheet together through a metal solder according to welding parameters, and welding a second protection sheet and the connecting sheet together through the metal solder to form a protection structure; the welding parameters are obtained by inputting a preset early warning temperature and thrust information of the isolation structure into a preset welding optimization model; the assembling mechanism is controlled to sequentially combine the first insulating cover, the second insulating cover, the lower pole plate, the lower pole piece set, the first semi-finished product, the upper pole piece set and the lower pole plate, the two ends of the upper pole piece set are connected with the upper pole plate and the first protection piece respectively, the two ends of the lower pole piece set are connected with the lower pole plate and the second protection piece respectively, and the hot-melting self-protection resistor is formed. According to the method, the resistor can be automatically switched off during overcurrent, production can be carried out according to different requirements, the product reliability is improved, and the production efficiency is improved.

The utility model relates to a lightning arrester line overvoltage protection device, including lightning arrester, post insulator, wire clamp hardware, connecting plate unit and lead arc electrode. Connecting plate unit includes first connecting plate, second connecting plate and bolt assembly. Formed with a pair of insertion arms of phase-to-phase arrangement on the first connecting plate, form the strip slot on the second connecting plate and form the strip through groove on the inner bottom surface of strip slot. Two insertion arms can be inserted in the strip slot and the bolt rod in bolt assembly can pass through the gap formed between two insertion arms and strip through groove, and the first connecting plate and the second connecting plate are fixedly connected as a whole. The utility model can be applied between the post insulator and the lightning arrester of different spacing, and can ensure that the fastening components between the connecting assembly are established and form a tight fit, forming a firm and reliable connection. At the same time, the volume of the connecting assembly is reduced in space expansion, so that it is not easy to interfere with the surrounding installation environment.

To provide a compact varistor and a varistor array having a low clamping electric power.SOLUTION: A low aspect ratio varistor 10 has a rectangular configuration defining a first side surface 28 and a second side surface 29 that face each other and are offset in a widthwise direction 30 and a first end surface 26 and a second end surface 27 that face each other and offset in a lengthwise direction 34. The varistor includes a first electrode layer including a first electrode 16 having an electrode length in the lengthwise direction and an electrode width in the widthwise direction. The varistor may also include a second electrode layer including a second electrode having an electrode length in the lengthwise direction and an electrode width in the widthwise direction. The varistor may also include a first terminal 17 and a second terminal 19 adjacent to and connected with the first and second opposing end surfaces, respectively. At least one of the first and second electrodes may have an electrode aspect ratio less than about 1.SELECTED DRAWING: Figure 1C

A die 10A implementing an integrated circuit 20A comprises: a substrate; a plurality of electronic devices integrated on the substrate and interconnected to form at least a portion of an electronic ci

The utility model relates to an explosion-proof lightning arrester for switch equipment and the switch equipment with the explosion-proof lightning arrester, the explosion-proof lightning arrester comprises a lightning arrester shell, the lightning arrester shell comprises a transverse shell and a vertical shell extending from the transverse shell along the vertical direction, the transverse shell is provided with a connecting opening, and the vertical shell is provided with a mounting cavity extending along the vertical direction; the upper conductive terminal is arranged on the transverse side, far away from the switch equipment main body, of the connecting opening and vertically extends out of the connecting opening until entering the upper side of the mounting cavity; the shielding sleeve is sleeved on the periphery of the section, extending out of the connecting opening, of the upper conductive terminal and extends out of the lower end surface of the upper conductive terminal along the vertical direction; the lightning arrester core body is arranged in the mounting cavity and is in close contact with the lower end surface of the upper conductive terminal; and the lower conductive terminal is arranged in the mounting cavity and is in close contact with the lower end surface of the lightning arrester core body, and the lower conductive terminal is in close joint with the vertical shell and can be separated from the vertical shell when high-pressure gas is generated in the vertical shell due to high-pressure current.

The utility model discloses a low-inductive-reactance precision resistor and an electronic device. The low-inductive-reactance precision resistor comprises a first conductive plate, a first insulating layer, a first resistor foil, a second insulating layer, a second resistor foil, a third insulating layer and a second conductive plate which are sequentially stacked together in the vertical direction. Wherein two outer end edges of the first resistance foil and the second resistance foil are welded together; the first conductive plate and the first resistance foil are respectively welded together at a first position and a second position of the first resistance foil; the second conductive plate and the second resistance foil are welded together in the middle of the second resistance foil, and the current directions in the first resistance foil and the second resistance foil are opposite.

The utility model discloses a protection device for an extra-high voltage flexible direct current power transmission system, and solves the problem that in a protection device for a power transmission system, a resistor element is easily affected by external force and damaged, or stress is generated in the resistor element to affect the resistance value, so that the large current deformation resistance and the high voltage electric field of the resistor element are not uniform. The device comprises a resistor combination structure and an inter-stack connection pipeline, wherein the resistor combination structure comprises a plurality of resistor boxes; the plurality of resistor boxes comprise a plurality of in-box resistor modules, each in-box resistor module comprises a plurality of resistor units, a plurality of U-shaped metal resistor bodies are connected in series in each resistor unit to form a continuously bent strip, the through-flow section of the resistor is large, the through-flow capacity of large current is improved, meanwhile, the process of punching a resistor disc is abandoned, the utilization rate of a resistor material is improved, and the cost is reduced. The production cost is reduced, the competitiveness of the product is improved, and meanwhile, the insulators are arranged between the resistor units, so that the attraction effect between the resistor units can be prevented.

The invention discloses an intelligent lightning arrester with optimized energy absorption. The intelligent lightning arrester is characterized in that a reference signal is processed by adopting an adaptive energy weight filter so as to generate an energy dispersion control signal; decomposing the residual heat signal into a plurality of sub-band heat error signals and into a plurality of sub-band energy reference signals; applying the sub-band gradient transfer function to generate a plurality of sub-band energy reference signals; determining a sub-band fusion gradient through the filtered sub-band energy reference signal and the filtered sub-band heat error signal; determining an adaptive step size; updating the weight based on the adaptive step size and the fusion gradient; and integrating each weight to generate an updated weight of the adaptive energy weight filter, wherein the updated weight is applied to the adaptive energy weight filter to adjust the energy dispersion control signal. According to the lightning arrester, the calculation limitation of a traditional lightning energy absorption optimization system is solved, and energy dispersion and heat dissipation management in a wide frequency spectrum are improved.

The application relates to the field of systems for adjusting electric variables, and discloses a dynamic resistance compensation adjustment method for a high-linearity potentiometer, which comprises the following steps: collecting real-time voltage and excitation current of an adjustment node, and calculating the apparent resistance of an adjustment tap position; using a first-order difference operator to extract a dynamic evolution gradient representing impedance distribution characteristics and interface random interference noise; comparing the evolution gradient with an ideal linear slope to determine a deviation ratio coefficient; adjusting the feedback branch gain according to the deviation ratio coefficient, and introducing a phase lead compensation link based on the change rate of the deviation ratio coefficient; the application generates a forward reverse adjustment level, neutralizes signal phase lag caused by micro contact hysteresis of materials, makes the output electric parameter stable in a preset linear interval, effectively reduces full-range linearity error, suppresses the interference of interface transition impedance fluctuation on adjustment smoothness, and ensures that a precision adjustment link maintains a high-precision adjustment reference in a wide-temperature environment.

The utility model discloses a high-voltage lightning arrester capable of flexibly increasing and decreasing insulating umbrella covers, which comprises a lightning arrester main body, two sides of the top of the lightning arrester main body are both provided with mounting grooves, mounting blocks are clamped in the mounting grooves, the outer sides of the two mounting blocks are fixedly connected with the insulating umbrella covers sleeved on the surface of the lightning arrester main body, and the insulating umbrella covers are clamped in the mounting grooves. According to the lightning arrester, the structural design that the number of the insulating umbrella covers can be flexibly adjusted is adopted, the flow guide area of the lightning arrester is adjusted by increasing or decreasing the number of the insulating umbrella covers, and therefore the lightning arrester is convenient to install and maintain, the service life of the lightning arrester is prolonged, and the service life of the lightning arrester is prolonged. The size of the lightning arrester can be adjusted according to actual working requirements, the universal effect is achieved, the lightning arrester can be applied to various fields, the use cost input is reduced, and convenience is provided for work and use of a user.

The utility model discloses a high-voltage lightning arrester convenient to replace an insulating umbrella cover, which comprises a plurality of high-voltage lightning arresters I. Each high-voltage lightning arrester I comprises a base, the top of each base is provided with an insulating umbrella cover body, and the top of each base is provided with an insertion cavity. An inserting cavity is formed in the insulating umbrella cover body, an inserting block inserted into the inserting cavity is detachably installed at the bottom of the insulating umbrella cover body, open grooves are formed in the two sides of an inner cavity of the inserting cavity, and clamping arms are movably installed in the open grooves. According to the high-voltage lightning arrester, when any layer of insulating umbrella cover of the high-voltage lightning arrester is damaged, the insulating umbrella cover can be independently disassembled from the whole high-voltage lightning arrester to be replaced, so that a user only needs to replace the damaged insulating umbrella cover of the corresponding layer to quickly complete replacement and recover normal work of the lightning arrester, the maintenance efficiency of the user is improved, the maintenance cost is reduced, and the working efficiency of the user is improved. And convenience is provided for work and use of the user.

The utility model discloses an adjustable spring type resistance wire which comprises a ceramic tube, a resistance wire body and a connecting plate, the resistance wire body is wound on the outer surface of the ceramic tube, the two ends of the resistance wire body are electrically connected with connectors, sliding grooves are formed in the two sides of the connecting plate, sliding plates are connected in the sliding grooves in a sliding mode, and the sliding plates are connected with the ceramic tube. A sliding sleeve is fixedly connected between the two sliding plates and arranged on the outer side of the resistance wire body in a sleeving mode, a base is fixedly connected to the top of the sliding sleeve, a threaded conducting rod is inserted into the base in a threaded mode, the bottom end of the threaded conducting rod makes contact with the resistance wire body, shunting heads are fixedly connected to the two ends of the threaded conducting rod, and pressing rings are fixedly connected to the other ends of the shunting heads. The sliding sleeve is pulled to enable the sliding plate to move in the sliding groove, so that the threaded conducting rod moves along the resistance wire body, the length of the resistance wire body is adjusted, the resistance of the resistance wire body is adjusted, and operation is simple, convenient and fast.

The utility model discloses a thick-film chip resistor structure and relates to the technical field of thick-film resistors. The resistor comprises a tin layer, the right side of the tin layer is fixedly connected with a conductive plate, the right side of the conductive plate is in contact with two conductive strips, the right side of the protective shell is provided with a sliding groove, and the side, close to the conductive plate, of the outer surface of each conductive strip is in sliding connection with the inner wall of the sliding groove. The side, close to the conductive plate, of the outer surface of the conductive strip is fixedly connected with a threaded block, and the outer surface of the threaded block is in threaded connection with a fastening block. According to the thick-film resistor, the conductive strips are arranged, specifically, the conductive strips are poked to slide on the inner walls of the sliding grooves, and when the two conductive strips reach the required distance, the fastening block is rotated, so that the left side of the fastening block is in close contact with the right side of the protective shell, and the conductive strips are fixed, and the problem that the conventional thick-film resistor needs to be pulled when the distance between the two conductive strips is adjusted is solved. Adjustment is inconvenient, and the bus bar is easy to damage.

The invention relates to the technical field of distribution line lightning protection, and discloses a gap-adjustable lightning arrester capable of being replaced in an electrified manner, which comprises a lightning arrester body, a composite insulator, a telescopic discharge electrode and a telescopic mechanism with reciprocating guiding and self-locking functions. Through cambered surface-tangent line matching and an elastic tongue piece self-locking structure, the lightning arrester can be quickly mounted and dismounted under an electrified condition; through the threaded telescopic adjusting mechanism, the air gap between the telescopic discharge electrodes is changed, so that different discharge gaps are formed at different adjusting positions to meet the operation requirements under different altitude conditions of 1000-4000 m. According to the invention, an integrated structural design is adopted, insulators with different structural heights can be directly replaced, the models of spare parts are reduced, the installation and operation and maintenance processes are simplified, the hot-line work safety and the power supply reliability are improved, and the lightning protection insulator is suitable for maintenance-free lightning protection application scenarios of 10kV overhead lines.

A thermal printhead includes a plurality of heating resistor portions, a first capacitor, a switch section, and a first resistor. The heating resistor portions are electrically connected in parallel to each other. The first capacitor is electrically connected in parallel to the heating resistor portions. The switch section is electrically connected in series to the first capacitor. The first resistor is electrically connected in parallel to the first capacitor.