748results about "Variable inductances" 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.

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 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 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 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 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.

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, a power-side alternating current (AC) / direct current (DC) converter can be connected to a source power grid without the need for an isolation transformer by providing a separate bus between the power-side AC / DC converter and the load-side DC / DC converter, instead of a DC bus shared between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tap-changing transformer or an autotransformer, for connecting any number of auxiliary loads of the plant to the power grid. The adjustable transformer may accommodate various types of auxiliary load devices for connecting to the power provided simultaneously by the transformer, including both three-phase and one-phase devices.

The invention relates to the technical field of transformers, in particular to a transformer on-load tap changer and a voltage regulation control method. The method comprises the following steps: acquiring a high-voltage side voltage, a low-voltage side voltage and a low-voltage side current; acquiring low-voltage fluctuation and low-current fluctuation according to the fluctuation difference between the low-voltage side voltage and the low-voltage side current in the historical data; comparing the volatility before the starting moment to determine a fluctuation time period; on-load voltage difference is obtained based on the correlation between the high-voltage side voltage and the low-voltage side voltage of the first half section of the fluctuation time period in the historical data and the difference between the current moment voltage and the historical moment voltage; obtaining the critical risk of the on-load voltage based on the offset and the difference of the on-load voltage; the switching taps are adjusted based on a comparison of the on-load voltage critical risk to a risk threshold. According to the invention, the voltage regulation response speed, the voltage regulation precision and the overall stability of power grid operation are improved.

The present invention discloses an adjustable hollow reactor and method, relating to the field of electrical component technology. The hollow reactor includes a support platform and a winding column arranged at its upper end. An inductor is wound around the outer side of the winding column, and the inductor is spirally wrapped around the surface of the winding column. An internal channel is provided inside the winding column. A vertically arranged connecting frame is provided on the right side of the inductor. The upper and lower ends of the connecting frame are connected and fixed to the winding column by connecting cross bars. This application improves on the shortcomings of existing reactors and can adjust the reactor's reactance value as needed to meet the needs of different scenarios. It eliminates the drawback of the existing reactor's large adjustment limitations, and the adjustment unit is arranged away from the winding column to avoid interfering with the flow of air outside it, reducing the impact on the heat dissipation effect. When the temperature reaches the set value, the flow of liquid can be accelerated, thereby improving the heat dissipation effect.

The invention relates to the technical field of transformers, in particular to an oil-immersed transformer with a tapping regulating switch, which comprises a main oil tank, an iron core is arranged in the main oil tank, a low-voltage winding is arranged around the outer side of the iron core, a high-voltage winding is arranged around the outer side of the low-voltage winding, and the oil-immersed transformer further comprises an auxiliary oil cylinder, the auxiliary oil cylinder is vertically arranged on the rear side of the main oil tank, and a loading and unloading opening is formed in the top of the auxiliary oil cylinder. The whole switch module, including the switch mounting rack, the tap switch and the sealing cover plate, is safely, stably, cleanly and vertically lifted out of the auxiliary oil barrel as a whole through a hydraulic lifting structure formed by the lifting oil cylinder, and meanwhile, the auxiliary oil barrel is communicated with the lifting oil cylinder through the oil way design; oil pumped out from the bottom of the auxiliary oil barrel directly enters the bottom of the lifting oil cylinder to serve as a pushing medium, internal recycling of the oil is achieved, dependence on large hoisting equipment and a large amount of manpower is reduced, and the tap adjusting switch is more flexible and convenient to maintain.

The invention relates to the technical field of inductors, and discloses an inductor convenient to adjust inductance intensity, which comprises a supporting seat, a supporting plate is fixedly connected to the surface of the supporting seat, a guide plate is fixedly connected to the top of the supporting plate, a sliding groove is formed in the outer wall of the guide plate, and a coil is fixedly connected to the surface of the supporting seat. The outer wall of the coil is fixedly connected with a first guide block, the outer wall of the first guide block is fixedly connected with an iron core, a partition plate is inserted into the inner wall of the first guide block, a first guide groove is formed in the outer wall of the first guide block, and the adjusting mechanism is arranged at the top of the supporting base. According to the inductor, the intensity of the inductor is adjusted through the adjusting mechanism, so that the intensity of the inductor can be adjusted by changing the cross sectional area of the iron core and the cross sectional area of the wire, temperature rise caused by obvious resistance change after the inductor is adjusted is prevented, and the inductor convenient for adjusting the intensity of the inductor keeps stable performance in the inductor adjusting process.

According to the high-low voltage lead structure of the single-machine 48-pulse hydrogen production rectifier transformer, a left device body, a right device body and a self-coupling modulation device body are arranged in an oil tank of the single-machine 48-pulse hydrogen production rectifier transformer, the self-coupling modulation device body is connected with the left device body and the right device body at the phase angle difference of 7.5 degrees, and the self-coupling modulation device body is powered by a grid-side three-phase power source. Power sources of the left transformer body and the right transformer body are output through the self-coupling modulation transformer body, a phase shift phase with the phase angle difference of 7.5 degrees is arranged between the left transformer body and the right transformer body, and four rectifiers with 12 pulses and 15-degree phase difference can be dragged by the valve side of a single 48-pulse rectifier transformer, so that the one-to-four function can be effectively realized, and the power consumption is reduced. Meanwhile, the size and the weight of the system are effectively reduced, the overall manufacturing cost is greatly reduced, and rapid industrialization of green hydrogen is facilitated.

The present invention belongs to the technical field of transformer voltage regulation, and relates to an on-load tap changer. The on-load tap changer comprises: a tap changer body and a driving mechanism fixed on the tap changer body, wherein the tap changer body comprises a housing; a plurality of insulating fixing plates, which are lined up and are perpendicularly fixed at the bottom of the housing at equal intervals; a rotary disk, comprising grooved wheels and a cam disk, which are coaxially and integrally formed, wherein the cam disk is rotationally connected to the insulating fixing plates, and the grooved wheels are connected to the driving mechanism; a plurality of vacuum tubes, which are respectively fixed to the insulating fixing plates; and a plurality of transmission mechanisms, wherein each transmission mechanism comprises a lifting lever and a push-back spring. In the present invention, when the driving mechanism drives the grooved wheels to rotate for voltage regulation, the cam disk is synchronously driven to rotate, then, the lifting lever and the push-back spring of each transmission mechanism are used to drive a movable end of each vacuum tube to move back and forth to implement arc extinguishing by means of switching, thereby implementing on-load voltage regulation of a transformer; and the vacuum tube, the transmission mechanism and the grooved wheel are located on the same insulating fixing plate, and the number of parts of the transmission mechanism is also greatly reduced, thereby effectively reducing the size of the tap changer.

The invention relates to the technical field of transformer regulation, and particularly discloses an on-load tap-changing transformer voltage monitoring method and system fused with optical fiber sensing, and the method comprises the steps: obtaining multi-mode monitoring data outputted by an optical fiber sensor, the multi-modal monitoring data comprises voltage fluctuation waveform data, vibration spectrum data, temperature distribution data and a load current change rate; acquiring real-time power grid disturbance data according to the voltage fluctuation waveform data; acquiring mechanical resonance phase data according to the vibration spectrum data; and establishing a winding hot-spot temperature change gradient according to the temperature distribution data, and generating a temperature-load correlation coefficient according to the winding hot-spot temperature change gradient. According to the invention, through multi-mode monitoring data acquisition, the operation state of the transformer is comprehensively mastered, the problem of single traditional monitoring data is solved, and cognition of the overall condition of the transformer is improved.

The invention belongs to the technical field of transformer gear calibration, and particularly discloses an oil immersed distribution transformer gear calibration device and method based on dynamic positioning, the calibration device comprises a gear shifting device, and the gear shifting device comprises a position detection circuit board used for detecting the real-time position of a transformer gear; a motor; a transmission assembly is arranged at the output end of the motor and used for controlling the transformer tap switch to rotate to the maximum gear and then rotate towards the first gear. According to the invention, the problem of large gear shifting error is solved, the stability of equipment and the precision of the gear shifting process are improved, and efficient operation of the transformer under different loads and working conditions is ensured.

The invention relates to a 220kV phase-shifting transformer combined with a voltage source converter and a method, and belongs to the technical field of phase-shifting transformers. According to the technical scheme, a phase-shifting transformer is formed by connecting a series transformer body and an excitation transformer body through a lead, and an external voltage source converter is connected in series between a phase modulation winding of the excitation transformer and a neutral point through an external lead; an on-load phase modulation switch is connected to an excitation variable phase modulation winding and is connected to a neutral point, on the basis of step-by-step discrete adjustment of gears of the on-load phase modulation switch, a voltage vector within a circular domain range is injected into each gear adjustment point through a serially-connected voltage source converter, and the voltage source converter is used for achieving more accurate control over a phase shift angle. The method is applied to steady-state control and transient regulation of the power flow, more accurate control of the phase shift angle is realized by using the voltage source converter, the dynamic performance is faster and better, the response speed is millisecond level, the cost of the method is much lower than that of a UPFC under the same capacity of phase shift and transformation, and the method has the advantage of engineering application.

The invention belongs to the technical field of transformer gear adjusting, and particularly relates to an excitation-free pole-mounted transformer gear adjusting device which comprises a supporting assembly, an execution assembly and a positioning camera, the supporting assembly comprises a base and a supporting rod arranged on the base, and a supporting arm is arranged at the top of the supporting rod; the execution assembly is arranged below the supporting arm and used for adjusting the gear of the transformer, the positioning camera is arranged on the supporting arm and used for calibrating the position of the execution assembly, the supporting rod is a multi-stage telescopic rod, a connecting block is arranged at the top end of the supporting rod, and one end of the supporting arm is fixed to the connecting block. According to the gear adjusting device, screwing-out and resetting of the protective screw cap are achieved through cooperation of the linear sliding rail and the electric rotary clamping jaw, manual climbing operation is not needed, the high-altitude falling risk and the hidden danger of electric shock existing in climbing operation are effectively avoided, and the working efficiency of gear adjusting is improved.