1004results about "Variable transformers" patented technology

The invention discloses a load-variable ultra-large-capacity dry-type transformer, and relates to the technical field of dry-type transformers, the load-variable ultra-large-capacity dry-type transformer comprises three groups of main iron core columns and three groups of auxiliary iron core columns, the section of each main iron core column is in a stepped shape, and three layers of amorphous alloy belts are laminated in each main iron core column; the thickness of the middle layer of the three layers of amorphous alloy belts is set to be 1.2-1.5 times that of the two side layers, and independent lap joint pieces are arranged at the joints of the lamination sets in the auxiliary iron core column. The stepped sections of the three groups of main iron core columns are combined with the magnet yokes with thin tops and thick bottoms, so that the magnetic flux density is uniformly distributed, the capacity of a single column is improved, the problems that the capacity of a single traditional dry-type transformer is limited and the whole transformer needs to be replaced during capacity expansion are solved, the occupied area is reduced through modular splicing, the capacity of a single group of iron core columns is increased, and the no-load loss is reduced.

The present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, power-side alternate current (AC) to direct current (DC) converters may be connected to a source power grid without the need for an isolation transformer by providing separate buses between the power-side AC-DC converters and load-side DC-DC converters instead of a shared DC bus between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tappable transformer or an autotransformer, to connect any number of auxiliary loads of the plant to the power grid. The adjustable transformer may provide for various types of auxiliary load devices to connect to the power provided by the transformer at the same time, including both three-phase devices and one-phase devices.

The present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, power-side alternate current (AC) to direct current (DC) converters may be connected to a source power grid without the need for an isolation transformer by providing separate buses between the power-side AC-DC converters and load-side DC-DC converters instead of a shared DC bus between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tappable transformer or an autotransformer, to connect any number of auxiliary loads of the plant to the power grid. The adjustable transformer may provide for various types of auxiliary load devices to connect to the power provided by the transformer at the same time, including both three-phase devices and one-phase devices.

The invention discloses an automatic voltage regulation method and device for a portable on-load transformer, and the method comprises the steps: collecting images corresponding to a push rod when a gear-shifting knob of the on-load transformer is located at different gears in the process that the push rod of a gear-shifting mechanism pushes the gear-shifting knob for gear shifting, so as to build a feature image library of the images of the push rod under each gear; when gear adjustment is carried out each time, whether gear adjustment is completed or not is comprehensively judged according to the resistance change condition of swing of the push rod when the gear adjustment knob is pushed and the push rod image collected in real time, and the current push rod image collected when gear adjustment is completed is compared with the image of the corresponding gear in the feature image library to determine whether gear adjustment is correct or not. Whether the gear shifting process is completed or not can be comprehensively judged, and the accuracy of each gear shifting operation is ensured; the gear corresponding to the current push rod is accurately recognized, so that whether the gear is correctly shifted to the target gear or not is accurately judged, the gear recognition precision is high, and the reliability is high.

The utility model discloses a transformer with multiple voltage levels. The transformer comprises an iron core, a first winding and a second winding, wherein the first winding and the second winding are wound on the iron core; the second winding comprises a first winding section and a plurality of second winding sections, and at least one of the plurality of second winding sections has one coil turn number; wherein taps are formed at the connecting position of the first winding section and the first second winding section and at the connecting position between the adjacent second winding sections, and the starting end, the tail end and the taps of the second winding are suitable for being externally connected to form multiple voltage grades. Parts or all of the wires of the second winding section are limited to be one turn, so that the risk of excessive winding or less winding is greatly reduced, and meanwhile, the winding efficiency is improved.

The invention relates to the technical field of wireless communication, and provides a load transformer and a differential amplifier, the load transformer comprises a first metal layer, a second metal layer, a third metal layer and a fourth metal layer which are sequentially stacked, and the first metal layer, the second metal layer, the third metal layer and the fourth metal layer are mutually spaced and asymmetrically arranged; the first metal layer is an annular first coil layer, the second metal layer is an annular second coil layer, the third metal layer is an annular third coil layer, and the fourth metal layer is a grounding layer; the load transformer further comprises a first substrate dielectric layer, a second substrate dielectric layer and a third substrate dielectric layer. The first substrate dielectric layer is arranged between the first metal layer and the second metal layer; the second substrate dielectric layer is arranged between the second metal layer and the third metal layer; the third substrate dielectric layer is arranged between the third metal layer and the fourth metal layer. The load transformer is small in area, low in cost and convenient to improve the utilization rate of the substrate.

The invention discloses a high-capacity on-load tap-changing transformer which comprises a body oil tank, a capsule type oil conservator is installed on the upper portion of one end of the body oil tank, an on-load tap-changing switch is installed at the other end of the body oil tank, and radiators are installed outside the two opposite sides of the body oil tank. A transformer body in the body oil tank is composed of windings and an iron core, the windings comprise a low-voltage winding, a high-voltage winding, a coarse voltage regulation winding and a fine voltage regulation winding which are sequentially arranged from inside to outside, and the high-voltage winding, the coarse voltage regulation winding and the fine voltage regulation winding are connected with the on-load tap-changer through leads. By adopting a coarse and fine voltage regulation structure, the coarse voltage regulation winding and the fine voltage regulation winding can be completely thrown away when the transformer operates at the most negative tap, so that stray loss caused by magnetic leakage can be effectively reduced, resistance loss caused by self resistance of the voltage regulation windings is reduced, and economical efficiency and reliability of operation of the transformer are greatly improved.

An on-load tap-changer includes: a tap-changer body and a driving mechanism fixed on the tap-changer body. The tap-changer body includes a housing, multiple insulation fixing plates, multiple turntables, each of which includes a sheave and a cam plate, the cam plate of which is rotatably connected to the insulation fixing plate, and the sheave of which is connected to the driving mechanism, multiple vacuum tubes fixed on the multiple insulation fixing plates, and multiple transmission mechanisms, each of which includes a lifting lever and a reverse spring. When the driving mechanism drives the sheave to regulate voltage, the cam plate is synchronously driven to rotate, and then the vacuum tube is driven by the lifting lever and the reverse spring to achieve on / off arc extinction, thereby achieving on-load voltage regulation.

The invention relates to the technical field of magnetic integrated inductors, and discloses an adjusting device and an assembling method. A placing space is formed between the second adjusting part and the first adjusting part, the magnetic integrated inductor is placed in the placing space, and a first through hole is formed in the first adjusting part and / or the second adjusting part; the first connecting piece is arranged in the first through hole in a penetrating mode, the distance of the first connecting piece extending into the first through hole is adjusted, and the first connecting piece is used for adjusting the size of gaps between the first cover plate and the first stand column and between the second cover plate and the first stand column so as to adjust the inductance value. The first through holes are formed in the first adjusting piece and the second adjusting piece, the first connecting pieces are arranged in the first through holes in a penetrating mode, and the distance between the first adjusting piece and the first cover plate and the distance between the second adjusting piece and the second cover plate can be adjusted by adjusting the distance, extending into the first through holes, of the first connecting pieces; the inductance value of the magnetic integrated inductor can be adjusted to a more stable numerical range, and the adjustment accuracy is high.

The invention relates to the technical field of power grid and transformer manufacturing, in particular to a control method and system for a permanent magnet on-load voltage regulation tap switch, and the method comprises the steps: collecting a permanent magnet switch gear signal through a switch gear signal collection module; voltage information of the low-voltage side of the transformer is acquired through a voltage signal acquisition module; logic judgment is carried out on the collected gear signals and the low-voltage side voltage signals, and permanent magnet mechanism driving current is output through a central controller; a selection driving mechanism in a tap switch is driven by a permanent magnetic mechanism to complete connection switching of transformer tapping taps; and the central controller performs double-closed-loop judgment on the gear signal and the voltage signal on the low-voltage side of the transformer, and gives a corresponding instruction according to a judgment result. The method has the beneficial effects that the state of the permanent magnet on-load tap-changer is monitored in real time through the double feedback loops, the control precision is improved, and faults are reduced; the central controller dynamically adjusts the driving current, ensures the consistency of the switching speed, adapts to different environments, and prolongs the service life.

A smart variable inductor based on magnetorheological materials comprises an "EE"-shaped iron core, two DC control coils, one AC coil, and a magnetorheological material gap. The magnetorheological material gap is located on the central column of the "EE"-shaped iron core. The two DC control coils and the AC coil are wound around the two side columns and the central column of the "EE"-shaped iron core, respectively. By controlling the DC current in the DC control coil, the magnetic saturation of the side columns can be changed, thus achieving intelligent wide-range adjustment of the inductance of the AC coil. The beneficial effects of this patent are: the provided smart variable inductor based on magnetorheological materials, due to the higher permeability of magnetorheological materials than air, which decreases with increasing magnetic field strength, has advantages such as a wide inductance adjustment range and low diffusion flux. When used in LLC resonant converters, it can achieve intelligent wide-range adjustment of input / output voltage and load, as well as intelligent current sharing control in multi-parallel converters.

The invention provides an automatic gear shifting device and method for a transformer tap switch. The gear shifting device comprises a rack and a lifting mechanism arranged in the middle of the rack, a rotating mechanism is arranged at the lifting end of the lifting mechanism, and a mechanical arm used for clamping the tap switch is arranged at the rotating end of the rotating mechanism; the side edge of the rack is also provided with a visual acquisition and analysis module which is used for acquiring gear image information of the tap switch, analyzing gear shifting execution information and transmitting the gear shifting execution information to the rotating mechanism; the rotating mechanism rotates the tap switch to a corresponding gear based on the gear shifting execution information; the operation risk of personnel can be reduced, the gear shifting efficiency is improved, and the power failure duration of the distribution transformer is effectively shortened.

The patent of the present invention discloses a special on-load voltage regulating switch for distribution transformer and an on-load voltage regulating distribution transformer. The switch includes a mounting main board, an insulating back plate, a driving mechanism component, a selection switch component, a switching switch component, and a transition element. The driving mechanism component includes a stepping motor, a gearbox, a bevel gear, a driving gear, and a square shaft. The rotational motion of the stepping motor is transmitted to the driving gear by means of the gearbox and the bevel gear. The driving gear drives the square shaft to rotate, and then drives the selection switch component and the switching switch component to move, completing the conversion of the voltage regulating gear. The on-load voltage regulating switch is miniaturized, and is installed in the distribution transformer without changing its conventional shape and volume. Frequent voltage adjustment of the distribution transformer under load is realized, the power supply voltage is stabilized, the loss is reduced, and a wide range of multi-gears and refined voltage regulation are realized. At the same time, the life cycle of the switch is equal to the life cycle of the distribution transformer body, and no maintenance is required during its life cycle, which improves the reliability of the on-load voltage regulation of the distribution transformer.

The present invention relates to the technical field of dry-type transformers, and discloses a dry-type transformer, including multiple groups of coil windings, multiple contact posts are alternately arranged on the coil windings, and also includes a gear adjustment unit arranged on each coil winding for connecting any two adjacent staggered contact posts, and an auxiliary adjustment unit is arranged on the gear adjustment unit, and the gear adjustment unit includes an annular clamping groove opened on the wall of the contact post. The dry-type transformer slides on the connecting rod through two sliders, and under the cooperation of the second spring, two limit blocks slide on the wall of the pressing cavity, so that the limit blocks are clamped or separated with the limit groove, and the arc clamp is limited, so that the gear adjustment of the coil winding can be completed, and there is no need to frequently loosen or tighten the bolts to adjust the gear, so that the gear adjustment efficiency is higher, and it is not easy to damage the transformer gear adjustment unit, so that the transformer gear adjustment is more convenient.

The invention relates to an electrolysis plant (10) with a plurality of electrolysis devices (34, 36) connected to a power supply line (30), wherein the electrolysis devices (34, 36) comprise a power supply unit (38, 40) and an electrolysis module (12, 14, 16, 18, 20, 22, 24, 26) coupled to the power supply unit, wherein the power supply units of the electrolysis devices comprise a transformer (42, 44, 46, 48) and a rectifier unit (50, 52, 54, 56, 58, 60, 62, 64), wherein the transformer comprises a primary winding (66, 68, 70, 72) and a secondary winding (74, 76, 78, 80, 82) connected to an AC voltage side of the rectifier unit. 84, 86, 88).According to the invention, the primary winding of the transformer of at least one of the electrolysis devices (40) is designed to be adjustable in stages, and the rectifier unit of this electrolysis device is designed to be operated uncontrolled, wherein the rectifier unit of the power supply unit of at least one of the second electrolysis devices is designed to be operated in a controlled manner depending on the electrical energy available from the energy source.

The invention relates to the technical field of dry-type transformers, and discloses an energy-saving dry-type transformer which comprises a plurality of coil windings, a plurality of contact columns are alternately arranged on the coil windings, and the energy-saving dry-type transformer further comprises gear adjusting units which are arranged on the coil windings and used for connecting any two staggered adjacent contact columns. An auxiliary adjusting unit is arranged on the gear adjusting unit, and the gear adjusting unit comprises an annular clamping groove formed in the column wall of the contact column. According to the energy-saving dry-type transformer, two sliding blocks slide on a connecting rod, under the cooperation of a second spring, two limiting blocks slide on the cavity wall of a pressing cavity, the limiting blocks and limiting grooves are clamped or separated, arc-shaped calipers are limited, and gear adjustment of a coil winding can be completed; according to the gear adjusting device, the tightening bolt does not need to be frequently unscrewed for gear adjustment, so that the gear adjusting efficiency is higher, the gear adjusting unit of the transformer is not prone to being damaged, and the gear adjustment of the transformer is more convenient.

The present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, power-side alternate current (AC) to direct current (DC) converters may be connected to a source power grid without the need for an isolation transformer by providing separate buses between the power-side AC-DC converters and load-side DC-DC converters instead of a shared DC bus between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tappable transformer or an autotransformer, to connect any number of auxiliary loads of the plant to the power grid. The adjustable transformer may provide for various types of auxiliary load devices to connect to the power provided by the transformer at the same time, including both three-phase devices and one-phase devices.

A method of generating a timing control signal for controlling the timing of a change of a transformer tap of a transformer is provided. The transformer includes an on-load tap changer including plural respective transformer taps. The method includes monitoring a voltage on a primary side and / or on a secondary side of the transformer to obtain a monitoring signal and deriving, from the monitoring signal, an intermediate signal that is indicative of at least one zero crossing of a tap voltage at the transformer tap. Deriving the intermediate signal includes estimating, based on the monitoring signal, a phase of the monitored voltage to obtain a phase signal and applying to the phase signal a phase correction for a phase shift between the monitoring signal or a signal derived therefrom and the tap voltage at the transformer tap. The timing control signal is derived from the intermediate signal.

The invention discloses an on-load tap-changer gear shifting method and device based on distance measurement, and belongs to the field of on-load tap-changer voltage regulation, and the method comprises the steps: receiving a gear shifting instruction, and obtaining a target gear according to the gear shifting instruction; according to the target gear and a preset distance and gear mapping relation, determining a target moving distance of a moving contact fixing cross rod; the driving motor drives the movable contact piece fixing cross rod to ascend and descend, and the ascending and descending distance is detected in real time through the distance measuring sensor; when the lifting distance is equal to the target moving distance, the motor is stopped, so that the first movable contact piece and the second movable contact piece are in physical contact with a target first static contact and a target second static contact corresponding to the target gear respectively; and the selector switch is driven to act, so that the target first static contact and the first movable contact piece as well as the target second static contact and the second movable contact piece form electrical connection, and gear shifting is realized. Therefore, by implementing the method and the device, the problems of insufficient positioning accuracy and reliability of gear shifting of the on-load tap-changer in the prior art can be solved.

The invention discloses a boost-buck and power flow control integrated transformer system. The transformer system comprises a transformer main body which receives the voltage of a three-phase power supply device and performs step-up or step-down processing on the voltage; and the phase angle adjusting device is magnetically connected with the transformer main body and is electrically isolated from the transformer main body, the phase angle adjusting device is used for adjusting the phase angle of the voltage subjected to the step-up or step-down processing of the transformer main body and outputting the voltage subjected to the phase angle adjustment to a power transmission line. By combining the power flow control function with the transformer, the occupied area of the whole set of equipment can be reduced, the number of control loops and the number of equipment can be reduced, the investment cost can be reduced, the anti-short-circuit capability of the transformer can be improved, the structural complexity can be reduced, and the voltage to ground of a tap switch can be reduced.

The utility model relates to an inductor, which comprises a magnet and one or more groups of windings arranged in the magnet, and each group of windings comprises a main winding and an auxiliary winding; a through hole is formed in the magnet and penetrates through the first end face and the second end face of the magnet. The main winding and the auxiliary winding of each group of windings are assembled in the through holes; wherein each winding penetrates through the through hole and is arranged in the through hole of the formed magnet in a penetrating manner for assembly, and the two ends of each winding penetrate out of the through hole and are exposed out of the first end face and the second end face of the magnet respectively. After the magnet is formed, the winding is assembled, and the problem that the main winding and the auxiliary winding are conducted due to high-pressure forming is solved.

The invention relates to the technical field of transformers, in particular to an amorphous alloy oil-immersed transformer convenient to dissipate heat, which comprises a transformer body and a tap switch fixedly mounted at the top of the transformer body, a deflector rod is matched with a plurality of grooves, the tap switch and a fixed seat are coaxially arranged, and the fixed seat is fixedly connected with the deflector rod. The device comprises a fixed seat, the top of the fixed seat is in threaded connection with a protective cover, an annular rotating seat is slidably mounted in the fixed seat, an adjusting seat is arranged at one end of the top of the annular rotating seat, a limiting mechanism is arranged in the adjusting seat, and a connecting mechanism is arranged at the end, away from the adjusting seat, of the top of the annular rotating seat. And an adjusting mechanism is arranged in the fixed seat. The transformer has the advantages that the problem that in the prior art, due to the fact that abrasion may occur between the deflector rod and the groove after long-term use, the gap between the deflector rod and the groove is increased, and the possibility that the deflector rod is disengaged from the groove is increased is solved, and normal use of the transformer body is guaranteed.

The application discloses a variable-load super-large capacity dry-type transformer, relates to the related technical field of dry-type transformers, and comprises three groups of main iron core columns and three groups of auxiliary iron core columns, wherein the main iron core column section is provided in a stepped shape, the inside of the main iron core column is stacked by three layers of amorphous alloy strips, the thickness of the middle layer of the three layers of amorphous alloy strips is 1.2-1.5 times that of the two side layers, and the lamination groups in the inside of the auxiliary iron core column are provided with independent lap pieces at the joints. The application realizes uniform magnetic flux density distribution and single-column capacity improvement by combining the stepped section of the three groups of main iron core columns with the magnetic yoke which is thin at the top and thick at the bottom, solves the problems that the single capacity of the traditional dry-type transformer is limited and the whole machine needs to be replaced for capacity expansion, reduces the occupied volume through modular splicing, increases the capacity of a single group of iron core columns, and reduces the no-load loss.

The invention relates to the technical field of magnetic variable measurement, in particular to a nondestructive testing method and device for magnetic conductivity of flaky metal magnetic powder, and the method comprises the following steps: acquiring initial sensitivity obtained by detecting the flaky metal magnetic powder to be detected by a detection coil in an initial state, and if the initial sensitivity is less than a preset sensitivity threshold value, determining that the flaky metal magnetic powder to be detected is detected; if not, adjusting the initial number of turns according to the minimum coil number of turns increase value to obtain an adjusted number of turns until the correction sensitivity of the detection coil in the latest state is greater than or equal to a preset sensitivity threshold value, so as to improve the induction sensitivity of the detection coil to the inductance value of a small-size sample of flaky metal magnetic powder. Further, the accuracy degree of magnetic conductivity detection of the flaky metal magnetic powder is improved; and obtaining the damage probability of the to-be-detected flaky metal magnetic powder obtained in the process that the detection coil detects the to-be-detected flaky metal magnetic powder in the latest state, and adjusting the initial excitation current based on the damage probability to reduce the damage probability of the to-be-detected flaky metal magnetic powder in the detection process.

The invention relates to the field of transformer control, and particularly discloses a dual-energy-saving roll-core intelligent transformer system and a transformer. The load rate of the dual-energy-saving roll-core intelligent transformer is obtained and compared with the optimal load rate range of the dual-energy-saving roll-core intelligent transformer; judging whether the operation of the double-energy-saving roll-core intelligent transformer needs to be regulated or not, if so, obtaining the load state of the double-energy-saving roll-core intelligent transformer, and when the intelligent transformer is in light-load operation, analyzing the output voltage of the intelligent transformer in the light-load state and the appropriate down-regulation amount of the operation capacity, and reducing the no-load loss; when the intelligent transformer operates in a heavy load mode, the appropriate up-regulation amount of the output voltage and the operation capacity of the intelligent transformer in the heavy load state is analyzed, the power supply quality is ensured, and then load self-adaptive adjustment of the double-energy-saving roll iron core intelligent transformer is achieved. Therefore, the device always works in the optimal load rate range.

The invention discloses a miniaturized on-load voltage regulation switch and an on-load voltage regulation distribution transformer, the switch comprises a driving mechanism assembly, a transmission mechanism assembly, a selection switch assembly, a change-over switch assembly, a transition element and an insulation installation mainboard, the driving mechanism assembly comprises a servo motor, a gearbox, a driving cam disc, a transmission gear and a driving deflector rod wheel, the transmission mechanism assembly comprises a groove strip, a linkage mechanism and a transmission shaft, the servo motor drives the groove strip, the linkage mechanism and the transmission shaft to act in a timing sequence by means of the gearbox, the driving cam disc, the transmission gear and the driving deflector rod wheel, then the selection switch assembly and the change-over switch assembly are driven to act, and conversion of voltage regulation gears is completed. A linear mechanism design is adopted, the structure is simple and compact, the conventional size of the distribution transformer hardly needs to be changed when the distribution transformer is installed, a bridging principle can be adopted, a non-excitation switch is directly replaced by an on-load voltage regulation switch, and the on-load voltage regulation switch is used for directly transforming the non-excitation distribution transformer into the on-load voltage regulation distribution transformer.

The invention belongs to the technical field of transformer high-voltage tap switches, and particularly relates to a transformer high-voltage tap switch and a high-voltage lead wiring method. According to the invention, by merging the idle coil into the operation area, the overall resistance of the coil in the tapping area is reduced, and the load loss of the transformer is obviously reduced, so that the energy efficiency is improved, and on the premise of keeping the load loss unchanged, the sectional area of the wire in the tapping area can be reduced by reasonably adjusting the coil wiring mode; therefore, the cost of copper wires and other main materials in the transformer manufacturing process is reduced.

The invention provides a variable-step-size on-load tap changer, a control method, a control system, equipment and a medium. The variable-step-size on-load tap changer comprises at least one static contact unit, two moving contact mechanisms and a control device, wherein the two moving contact mechanisms independently slide on the static contact unit; the control device is connected with the two moving contact mechanisms; the static contact unit comprises three static contacts, and all the static contacts are arranged in an annular array. Each moving contact mechanism realizes uninterruptible conductive connection switching with each static contact in the sliding process; by means of the characteristics that the number of the static contacts is matched with that of the moving contact mechanisms, the moving contact mechanisms move independently, and all the static contacts are arranged in an annular array, the two moving contact mechanisms can slide to the static contact of any potential in one-step action, the static contacts of multiple potentials are combined and connected pairwise, seven voltage adjusting gears are formed, and the voltage adjusting efficiency is improved. Therefore, one-step switching between variable-step voltage regulation and any voltage regulation gear is realized, and cross-gear quick regulation is realized.

The invention discloses an OLTC topological structure of an electronic soft switching technology and a driving method. In the topological structure, a power supply is connected with a first transformer, the first transformer is connected with a second transformer, and the second transformer is connected with a load; a low-voltage winding of the first transformer is connected with a plurality of taps; the fixed end of the low-voltage winding of the first transformer and each tap are connected with one end of an independent mechanical switch; according to an interval connection mode, the other ends of all the mechanical switches are connected to form two series switch loops, and each series switch loop is connected with an independent electronic change-over switch to form two series circuits; the two electronic change-over switches are connected in parallel, and the second transformer is connected into a series circuit controlled by the two electronic change-over switches respectively. The mechanical switch and the electronic change-over switch are jointly used, so that short-circuit current and surge voltage cannot be generated when the electronic change-over switch performs state switching, and the quality of output voltage waveforms is improved.

The invention discloses a strip-shaped off-circuit tap-changer device which comprises a supporting structure, three phases of static contact assemblies are arranged on the supporting structure, and each phase of static contact assembly is provided with a moving contact assembly. A rack capable of sliding back and forth is arranged in the supporting structure; the moving contact assembly is installed on the rack and can move back and forth along with the rack. A transmission shaft is rotationally mounted on the supporting structure; a gear meshed with the rack is coaxially fixed on the transmission shaft; the gear shifting limiting and locking mechanism comprises a gear indicating board, a handle and a limiting piece. The gear indication board is fixedly arranged on the transformer and arranged outside the transmission shaft in a sleeving mode. A plurality of positioning holes are formed in the gear indication board; the handle is positioned above the gear indication board and is fixed on the transmission shaft; the limiting piece is in threaded connection with the handle, and after the limiting piece is aligned with the positioning hole, the limiting piece spirally moves downwards and is inserted into the positioning hole. The device is simple in structure, stable and reliable in performance, low in manufacturing cost, investment-saving and good in anti-corrosion and moisture-proof performance.