205 results about "Tap changer" patented technology

The invention discloses an on-load tap-changer oil dissolved gas monitoring device which comprises a variable capacity container, a two-way electromagnetic valve, a switching mechanism, a chromatographic column system, a high-sensitivity detector and a low-sensitivity detector which are sequentially connected, and the top and the bottom of the variable capacity container are connected through a circulating pump to form a gas flow loop. The variable-capacity container is connected with the on-load tap-changer through a connecting pipe, the switching mechanism is connected with at least two quantitative pipes with different capacities, and the switching mechanism is used for equally transferring gas in the variable-capacity container to the quantitative pipes and then sequentially transferring the gas in the quantitative pipes to the chromatographic column system. The invention further discloses a method for monitoring the dissolved gas in the on-load tap-changer oil. According to the monitoring device and the monitoring method for the dissolved gas in the oil of the on-load tap-changer, the detection range of the concentration is improved, a concentration blind area which is not detected and misjudgment of signal saturation can be avoided, and the detection accuracy is improved.

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 an on-load tap-changer fault diagnosis method based on TVFEMD noise reduction-chaotic feature fusion-NGBoost, relates to the technical field of on-load tap-changer fault diagnosis, and is used for solving the problems that complex vibration signals are difficult to effectively analyze and single feature diagnosis precision is insufficient. Self-adaptive positioning of a vibration signal at the action moment of a change-over switch is realized by adopting a short-time energy-entropy ratio algorithm; signal noise reduction is carried out on the vibration signal by utilizing time-varying filtering empirical mode decomposition TVFEMD; feature extraction is carried out based on chaotic characteristics; delay time is determined through a mutual information method; and inputting the vibration signal into an NGBoost multi-classification fault diagnosis model for type identification. According to the method, the problems of instability, nonlinearity and high noise of OLTC vibration signals can be effectively solved, feature extraction is stable and reliable, and the fault diagnosis accuracy is high.

The application belongs to the technical field of power distribution network automation, and particularly relates to a power distribution transformer intelligent regulation and control method and system based on energy efficiency evaluation, which comprises the following steps: collecting the low-voltage side current, rated current, no-load loss and load loss of a power distribution transformer, and calculating the load rate; obtaining the fluctuation intensity according to the standard deviation of the load rate in a sliding window, and obtaining the change gradient by subtracting the load rates at adjacent time points; obtaining the direction consistency index according to the consistent degree of the directions of the change gradient in a preset number of steps; calculating the noise covariance according to the fluctuation intensity and the direction consistency index, and obtaining the smoothed load rate by substituting the Kalman filter equation; dynamically determining the threshold step number according to the direction consistency index, calculating the smoothed total loss, and determining the preset energy efficiency threshold according to the no-load loss and the load loss. The application reduces the tap changer regulation frequency and prolongs the service life of the contact.

The application discloses a kind of on-load tap-changer monitoring devices, methods, equipment and storage medium, the device includes position sensor, current sensor and information acquisition processor, position sensor is set to the transmission assembly of on-load tap-changer, for detecting the action information of on-load tap-changer switching knife switch, current sensor is set to the power electronic component of on-load tap-changer and the loop of switching switch, for detecting the current information of the power electronic component, information acquisition processor is used to receive action information and current information, and action information and current information are exported.The on-load tap-changer monitoring device of the embodiment of the application can monitor the action information of switching knife switch and the current information of power electronic component in real time by installing position sensor on transmission assembly, setting current sensor in the loop of power electronic component and switching switch, installation position is reasonable, and it is convenient to monitor on-load tap-changer internal information.

The invention relates to a load tap changer (10) for switching over between winding taps (N1,..., N J ,..., N N ) of a regulatable transformer (1) without interruption, comprising at least one selector unit (30) for preselecting to a selected winding tap (N J ) without power, at least one load switching unit (40) for actually load switching from a previous winding tap (N J _i) to the preselected winding tap (N J ), at least one gear mechanism (50) with a first gear wheel (31) and a second gear wheel (41), wherein the first gear wheel (31) is assigned to the selector unit (30) and the second gear wheel (41) is assigned to the load switching unit (40), a drive shaft (60) which is actuated by a motor drive (70), the first gear wheel (31) and the second gear wheel (41) are directly in mechanical action connection with each other, so that the gear wheels (31, 41) can be actuated simultaneously, the drive shaft (60) can drive the first gear wheel (31) or the second gear wheel (41).

The application discloses a triangular on-load voltage regulating tap switch and distribution transformer, which comprises a triangular shell, a time sequence contact assembly arranged in a strip layout in the shell and connected in series through a same square shaft, a wiring terminal arranged at each side of the triangular structure of the shell, and a stepping motor horizontally arranged in the shell and arranged in the same direction with the square shaft. The time sequence contact assembly comprises a support seat, a time sequence system arranged on the support seat, and a contact assembly. The time sequence system controls the opening and closing sequence of the vacuum arc-extinguishing chamber, and the contact assembly is driven by the stepping motor to realize gear shifting. The whole switch is installed below the transformer box cover. The application has the advantages of compact structure, convenient wiring, and reliable sealing ensured by integral buried installation. The pure mechanical time sequence system with a transmission ratio of 9:4 synchronizes the gear stepping and time sequence action, can stably realize 9-gear wide-range on-load voltage regulation, and improves the power supply reliability and equipment service life.

System (200) for operating a load tap changer, wherein the system comprises: a plurality of strands (208, 210), at least one of which is caused to switch from a first tap (202) to a second tap (204) of the load tap changer upon receipt of a tap change signal, each strand having at least one mechanical switch (214, 216) and wherein an electrical connection is established between the first tap (202) or the second tap (204) and a supply terminal (212) of the load tap changer when at least one mechanical switch (214, 216) of at least one of the plurality of strands is opened; and a plurality of semiconductor switches (220, 222, 224, 226), wherein each semiconductor switch (220, 222, 224, 226) is arranged in parallel to the mechanical switches (214, 216) and, in the activated state, provides an electrical connection between the first tap (202) or the second tap (204) and a supply terminal (212) of the load tap changer; and a processing unit (228) configured to selectively activate and deactivate the mechanical switches (214, 216) and the semiconductor switches (220, 222, 224, 226) such that the electrical connection between the at least one tap (202, 204) and the supply terminal (212) is maintained during the transition of the at least one strand (208, 210) from the first tap (202) to the second tap (204) without causing a short circuit between the two taps (202, 204). the processing unit (228) is also configured to: Generating the step switching signal to move at least one strand (208, 210) from the first tap (202) to the second tap (204) when a condition for step switching is met; Generating activation signals for the semiconductor switches (220, 222, 224, 226) when the stage switching signal is generated; and Generating a plurality of deactivation signals for the mechanical switches (214, 216) from at least one strand (208, 210) connected to the first tap (202) when a stage switching condition is met.

The on-load tap changer (100) comprises an input shaft (O1), an output shaft (O2), an input crank portion (1), a connecting rod portion (2), a swing crank portion (3), a first spring (6a), a second spring (6b), an output crank portion (4), a first limiting member (5a) and a second limiting member (5b), and an on switch (10). The swing crank portion (3) comprises a swing side first portion (31) and a swing side second portion (32). The swing side second portion (32) and the swing side first portion (31) sandwich the output shaft (O2). The first spring (6a) is connected with the swing side first portion (31). The second spring (6b) is connected with the swing side second portion (32). The direction of the force acting on the swing side second portion (32) under the action of the second spring (6b) is opposite to the direction of the force acting on the swing side first portion (31) under the action of the first spring (6a).

The application provides a quick mechanism of a load tap changer, which comprises a base, two groups of slide box type energy storage and release components symmetrically arranged on the base and used for synchronous reverse movement to store energy and release energy, a transmission input component connected with power input ends of the slide box type energy storage and release components, and a power output component connected with power output ends of the slide box type energy storage and release components. The two groups of slide box type energy storage and release components are symmetrically arranged, so that the movement directions of the two groups of slide box type energy storage and release components are opposite, and when the two groups of slide box type energy storage and release components release energy, the impact forces can be partially offset, the one-way impact force in the switching moment is reduced, the impact vibration is reduced, the switching failure rate of the load tap changer caused by the vibration is reduced, and the service life is prolonged.

This invention discloses a switching circuit and control method for a vacuum on-load tap changer, belonging to the field of tap changer technology. The switching circuit of this invention includes: a main current-carrying switch M1, a main current-carrying switch M2, a changeover switch T, vacuum circuit breakers V1, V2, and V3, and a transition resistor R. The timing sequence of switching from the N tap side to the N+1 tap side and from the N+1 tap side to the N tap side in this invention's switching circuit is symmetrical, greatly simplifying the mechanical design. The use of symmetrical timing and a single transition resistor design saves on switch manufacturing costs. The task of passing and interrupting current during the switching process is undertaken by the three vacuum circuit breakers V1, V2, and V3, sharing and balancing the switching task of the vacuum bulb.

This invention relates to a method and system for reducing frequent tap changer operations at receiving-end converter stations. The method includes: determining the dead zone range of the receiving-end converter station's shut-off angle; determining the relationship between the dynamic proportional coefficient h and the number of tap changer operations based on the operating characteristics of the UHVDC transmission system; and determining an initial value for the shut-off angle that reduces frequent tap changer operations at the receiving-end converter station based on the determined dead zone range of the receiving-end converter station's shut-off angle and the relationship between the dynamic proportional coefficient h and the number of tap changer operations. This invention can significantly reduce the number of tap changer operations at receiving-end converter stations, thereby reducing the probability of converter transformer failures and improving the operational reliability of converter transformers at the converter station. This invention can be widely applied in the field of power transmission system technology.

The application discloses a transformer on-load tap changer based on a phase selection technology and a gear switching method, which comprises a main circuit and a transition circuit connected with transformer winding taps, the main circuit comprises gear selection circuit and on-off circuit connected in sequence, the gear selection circuit comprises at least four relays for switching the working gear of the transformer; the on-off circuit is composed of vacuum circuit breaker VCB2, diode D2 and vacuum circuit breaker VCB4 connected in series; the transition circuit is formed by transition resistor R, vacuum circuit breaker VCB1 and diode D1 connected in parallel, and vacuum circuit breaker VCB3 connected in sequence, the transition circuit cooperates with the main circuit to realize the arcless switching of the transformer gear; all the vacuum circuit breakers are controlled to act by permanent magnet operating mechanisms, and the permanent magnet operating mechanisms are used to drive the vacuum circuit breakers to realize the fast on-off according to the voltage phase signal. The application controls the action of the vacuum circuit breaker by the phase selection technology and the conduction and cutoff characteristics of the diode, reduces the generation of arc, and prolongs the electric life.

A movable transformer on-load switch oil tank device relates to the technical field of transformer on-load switch maintenance equipment and comprises a horizontal oil tank body, a front universal wheel and a rear universal wheel, the front universal wheel and the rear universal wheel are arranged at the bottom of the oil tank body, a rotating handle is arranged on the front side of the oil tank body in the moving direction, and the lower end of the rotating handle is connected with the front universal wheel. A cover plate is detachably arranged on an opening in the front side of the oil tank body in the moving direction in a sealing and covering mode, an oil injection pipe is connected to the cover plate, a vacuum air nozzle and an oil injection opening are formed in the oil injection pipe, the vacuum air nozzle is connected with an external vacuumizing pipeline, the oil injection opening is used for oil injection of a transformer, and an oil discharge pipe is arranged at the bottom of the oil tank body. And the oil discharge pipe is used for injecting oil in the oil tank body into a transformer switch barrel and can be matched with the oil injection port to circularly heat and filter the oil. According to the utility model, the transformer oil required in the field core hanging inspection of the on-load switch of the transformer is effectively solved. The appearance size is small, and transportation and movement are convenient.

An electrical switch (1) for a load tap changer (2), the electrical switch (1) comprising: at least three electrical contacts (3a, 3b, 3c) connected to respective electrical conductors (4a, 4b, 4c); a switching device (5) configured to be movable between a plurality of positions (P1, P2), wherein the switching device (5) in each respective position (P1, P2) physically contacts a respective combination (C1, C2) of the electrical contacts (3a, 3b, 3c) to provide electrical contact between the electrical contacts in each respective combination (C1, C2) of electrical contacts (3a, 3b, 3c); a gas-tight sealed housing (6) providing an inner space (7) enclosing the electrical contacts (3a, 3b, 3c) and the switching device (5), the electrical conductors (4a, 4b, 4c) extending from the electrical contacts (3a, 3b, 3c) inside the inner space (7) of the housing (6) to outside the housing (6); and a control device (10) configured to control movement of the switching device (5). The inner space (7) is under vacuum or filled with arc suppressing gas. The control device (10) comprises an operating member (8) extending from outside the housing (6) into the inner space (7) of the housing (6), the operating member being operatively connected to the switching device (5) such that the operating member (8) is able to move the switching device (5) to the plurality of positions (P1, P2) depending on the position of the operating member (8). Further, the operating member (8) comprises an arm (9) rotatably attached to the housing (6) for rotation about an axis of rotation (11), wherein the switching device (5) is attached to an end portion of the arm such that the switching device (5) is movable along an arcuate path between the plurality of positions.

The utility model provides a sealing structure of a tap switch operating mechanism, which comprises a welding flange, a mounting flange, a conical shaft sleeve and a shaft seal, the welding flange is welded at the top of a transformer box cover, the mounting flange is arranged at the bottom of the operating mechanism and is connected with the welding flange through a bolt, the outer wall surface of the conical shaft sleeve is a conical surface, and the conical shaft sleeve is sleeved outside a main shaft. According to the tap switch operating mechanism, through the taper fit of the mounting flange and the conical shaft sleeve, the taper interference is realized, and the sealing performance of the tap switch operating mechanism is improved.

The invention provides a high-voltage double-voltage vehicle-mounted mobile transformer, which relates to the technical field of transformer manufacturing and comprises a transport vehicle, an oil tank is arranged at the top of the transport vehicle, an iron core is arranged on the right side in the oil tank, and the iron core is sequentially sleeved with a low-voltage winding, a high-voltage winding, a balance winding and a high-voltage regulating winding from inside to outside. A no-load tap changer is arranged on the front side of the left side in the oil tank, an on-load tap changer is arranged on the rear side of the left side in the oil tank, a high-voltage A-phase sleeve, a high-voltage B-phase sleeve and a high-voltage C-phase sleeve are sequentially arranged outside the oil tank from front to back, a low-voltage sleeve is arranged on the left side of the top of the oil tank, and a balance sleeve is arranged on the rear side of the middle of the top of the oil tank. The high-voltage winding is connected with the no-load tap changer and the high-voltage bushing through a lead, the high-voltage tap changer is connected with the on-load tap changer through a lead, the low-voltage winding is connected with the low-voltage bushing through a lead, and the balance winding is connected with the balance bushing. The invention has the advantages of reliable insulation, small volume, light weight, strong shock resistance and low cost.

The invention discloses a quantitative analysis method and system for overheat fault gas of an on-load tap-changer contact. The method comprises the following steps: constructing a multi-physical field coupling mathematical model of an on-load tap-changer, and defining contact resistance of a contact surface; solving the multi-physics field coupling model to obtain time domain and space domain temperature distribution of the surface of the on-load tap-changer contact, and determining the highest temperature and the volume of an overheat region; calculating the local gas production rate of each fault characteristic gas; carrying out integral calculation on local gas production rates of all fault characteristic gases in the hot area volume to obtain theoretical equilibrium concentration of each fault characteristic gas in oil, and constructing a mapping relation between an overheating parameter formed by the contact resistance and the highest temperature of the contact surface and the theoretical equilibrium concentration; the method aims at solving the problems that a traditional analysis method for the gas dissolved in the oil depends on experience criteria and is high in hysteresis quality, breaks through the bottleneck that the whole process of electricity-heat-fluidization cannot be simulated from the mechanism level, and achieves the crossing from qualitative diagnosis to quantitative prediction.

The invention discloses a phase-shifting transformer and a voltage-phase coordinated regulation and control method and system thereof.Decoupling of a three-phase magnetic circuit is achieved through the structural design of the phase-shifting transformer, control of the voltage-phase coordinated regulation and control system is matched, and the voltage-phase coordinated regulation and control of the phase-shifting transformer is achieved by moving a secondary winding of a B-phase iron core column and a C-phase iron core column on the corresponding iron core column. Flux linkage coupling of the winding and the primary winding is continuously and linearly changed, and continuous and accurate adjustment of the phase difference is achieved; meanwhile, a plurality of voltage regulating taps with tap switches are arranged on the secondary winding of the B-phase iron core column and the high-voltage sub-winding of the C, so that the effective turn ratio of the high-voltage sub-winding is independently changed, and the graded accurate regulation of the amplitude of the output voltage is realized; according to the method, a hierarchical control strategy is utilized, phase adjustment is rapidly completed preferentially, and voltage adjustment is executed after a system judges that a magnetic circuit is stable, so that the stability of each regulation action and the equipment safety are ensured, and the dynamic response speed and the control reliability of the system are greatly improved.

This invention relates to a method and system for detecting the operating status of on-load tap changers. The method for detecting the operating status of on-load tap changers includes the following steps: acquiring vibration signals of the on-load tap changer, and detecting the operating status based on a trained recognition model and the acquired vibration signals; wherein, the recognition model uses an expanded dataset of fault vibration signals of the on-load tap changer as training input, specifically: randomly selecting a fault sample point as the original sample point, searching for the K closest sample points centered on the original sample point, randomly selecting one of the searched sample points, generating a new sample between the original sample point and the searched sample point, and merging the generated new sample with the original fault sample as the fault dataset for training input.

The invention discloses a tapping section winding device of a non-excitation transformer, and relates to the technical field of winding devices, the tapping section winding device comprises a winding column, winding outer plates and connecting plugs, a tapping section mechanism comprises a U-shaped groove, the winding outer plates are installed at the two ends of the outer wall of the winding column, multiple sets of connecting plugs are installed on the outer walls of the winding outer plates, and the U-shaped groove is formed in the U-shaped groove. And a U-shaped groove is formed in the outer wall of the wrapping post. The tapping section mechanism is installed, in order to adjust voltage, many copper wires are wasted, for example, a tapping winding of + / -2 gears needs to be manufactured, the voltage deviation requirement needs to be met, the voltage requirement is met through the combination of parallel winding of two wires, one turn less winding of a certain section and parallel winding of two wires, transposition and one turn less winding of a certain section at present, materials are saved, and the cost is reduced. The cost is directly reduced, during winding, the wires are directly clamped into the U-shaped grooves, naturally keep parallel arrangement and do not intersect, and the wires are just clamped and fixed due to the depth of the U-shaped grooves.

Resistor arrangement (10) for a tap changer (1) for uninterrupted switching between winding taps of a transformer, the resistor arrangement (10) comprising at least one resistive element (20) which is held by at least two resistive holders (30), characterized by: - a base plate (11) with at least one opening (12) on which the at least two resistance holders (30) for receiving the resistance element (20) are arranged; - a guide (31) formed in each resistance holder (30), wherein each guide (31) positions a first end (201) or a second end (202) of the resistance element (20) with respect to a longitudinal direction (L) between the two resistance holders (30), and wherein the resistance element (20) can be inserted through the opening (12) into each of the guides (31); and - two contact points (24) of the resistance element (20) which, when a resistance element (20) is inserted into the resistance holder (30), can be electrically contacted by a respective contact (40) of the tap changer (1).

The invention relates to a 110kV vehicle-mounted transformer used in a low-temperature environment and a method, and belongs to the technical field of transformers. According to the technical scheme, an upper-section oil tank is as high as a transformer body and an on-load tap-changer, namely, the lower edge of the upper-section oil tank and the upper edge of the transformer body and the on-load tap-changer body are located on the same plane, the side of the transformer body of the upper-section oil tank corresponds to the transformer body in the oil tank, and the side of the on-load tap-changer of the upper-section oil tank corresponds to the on-load tap-changer; a high-voltage ascending flanged base of the transformer is horizontally welded on the side wall of an oil tank of the transformer, and is directly connected with the gas insulated substation through an epoxy resin dry oil-SF6 sleeve; a high-voltage neutral point ascending flanged base of the transformer is horizontally welded on the upper-section oil tank, and a connecting wire is vertically and downwards led out from a cable terminal. The vehicle-mounted transportation requirement is met, the internal and external structures meet the anti-seismic capacity requirement, and normal use in the low-temperature environment can be achieved.

Disclosed in the present invention is a high-capacity on-load tap‑changing transformer, comprising a main tank, wherein a capsule-type conservator is mounted on the upper part of one end of the main tank, an on-load tap changer is mounted at the other end of the main tank, and radiators are mounted externally on two opposite sides of the main tank. An active part inside the main tank consists of windings and a core; the windings include a low-voltage winding, a high-voltage winding, a coarse regulating winding, and a fine regulating winding that are sequentially arranged from inside to outside; the high-voltage winding, the coarse regulating winding, and the fine regulating winding are connected to the on-load tap changer by means of leads. By using coarse and fine regulating structures, the coarse regulating winding and the fine regulating winding can be fully bypassed when the transformer operates at the most negative tap position, thereby effectively reducing stray losses caused by leakage flux, and also lowering resistive losses arising from the resistance of the regulating windings, and thus significantly improving the operational economy and reliability of the transformer.

A switch assembly has an on-load tap changer and a drive system for the on-load tap changer. The drive system has: a stepper motor having a motor shaft, the motor shaft being connected to and configured to actuate the on-load tap changer; a feedback system, which is configured: to determine at least one value for a position of the motor shaft; and to generate a feedback signal based on the at least one value; and a control device, which is configured to influence the operation of the switch assembly depending on the feedback signal.

The application discloses a kind of transformer explosion-proof and fault monitoring device and method, belong to electric power equipment technical field.The specific device includes transformer oil tank pressure relief module, on-load tap changer pressure relief module, oil and gas separation tank, gas discharge pipeline, nitrogen injection module, transformer protection control cabinet, oil-immersed cable oil tank pressure relief module and transformer module, specific method includes: collecting transformer data;According to the power factor / loss factor of transformer bushing current collected calculation;Set transformer capacitance, power factor / loss factor and the early warning threshold of partial discharge signal and judge whether data reaches corresponding early warning threshold;Any data reaches early warning threshold in judgment result, determine transformer fault, trigger early warning and carry out transformer pressure relief, realize transformer explosion-proof and fault monitoring.The application realizes the pressure relief protection of transformer cable box, on-load tap changer module and main oil tank, and proposes online monitoring and fault diagnosis of key monitoring signals.

This invention provides an explosion-proof top cover, oil chamber structure, and a method for verifying the structural strength of an on-load tap changer. The top cover includes a top cover body; wherein the top cover body has a ring of small bolt holes arranged in a circular pattern, and a plurality of spaced connecting plates extend outward along the outer edge of the top cover body in the circumferential direction, each connecting plate having a large bolt hole; a plurality of radial reinforcing ribs are provided at the connection points between the top cover body and each connecting plate, each radial reinforcing rib extending outward from the center of the top cover body. This invention achieves radial expansion by extending connecting plates along the outer edge of the top cover body; it forms a double-layer bolted connection structure through the small and large bolt holes, realizing a double-layer bolted connection structure between the top cover and the transfer flange or oil tank top cover, dispersing the load at a single bolt hole and reducing its strain value; and through the radial reinforcing ribs, it suppresses the tendency of the top cover's central part to bulge upward under fault impact pressure, achieving overall structural reinforcement of the top cover.

The application aims to provide a hybrid on-load tap changer. The hybrid on-load tap changer comprises a first gear circuit, a second gear circuit, a main on-off switch, and a thyristor loop arranged between the first gear circuit and the second gear circuit; the thyristor loop comprises a thyristor and a changeover switch, a first anode of the thyristor is connected to a voltage input end of the hybrid on-load tap changer through the changeover switch, a second anode of the thyristor is connected to a voltage output end of the hybrid on-load tap changer through the main on-off switch, and the thyristor loop is used for switching the current from the first gear circuit to the second gear circuit during gear switching. By arranging the thyristor loop between the first gear circuit and the second gear circuit, the problem of long arc striking and pre-breakdown during current switching is solved.

The utility model discloses an on-load voltage regulator used in a photovoltaic power grid, and relates to the technical field of photovoltaic power grid equipment. According to the pressure regulator case, an air inlet and an air outlet are formed in the two sides of the inner wall of the pressure regulator case respectively, and an exhaust assembly is installed outside the air outlet; the filtering assembly comprises a coarse filtering bin and a fine filtering bin which are connected end to end, a connecting cover covering the air inlet is fixedly connected to the side face of the pressure regulator case, a coarse filtering net is fixedly connected to the face, away from the pressure regulator case, of the coarse filtering bin, and a middle filtering net is fixedly connected to the joint of the coarse filtering bin and the fine filtering bin; and a fine filter screen is fixedly connected to the joint of the fine filter bin and the connecting cover. According to the utility model, dust carried in air is filtered through the coarse filter screen, the medium filter screen and the fine filter screen in sequence and then is introduced into the pressure regulator case, so that equipment in the pressure regulator case can be cooled, dust accumulation in the pressure regulator case is reduced, damage to the equipment in the pressure regulator case caused by dust accumulation is avoided, and the service life of the pressure regulator case is prolonged.

The invention relates to the technical field of power transformer voltage regulation devices, and discloses a multi-stage on-load voltage regulation tap switch based on multi-path rotation selection, which comprises an integrated mounting carrier, and a driving device, a selection mechanism and a switching mechanism which are mounted on the integrated mounting carrier. The driving device takes a single stepping motor as a power source, and independently drives a forward rotation selection shaft or a reverse rotation selection shaft respectively by utilizing the one-way transmission characteristics of a forward rotation one-way bearing and a reverse rotation one-way bearing; the selection shaft drives the cam type selection switch to control the voltage regulating winding to be switched among three states of positive connection, reverse connection and non-connection; the switching mechanism adopts a permanent magnetic mechanism to drive a vacuum arc extinguishing assembly, and is matched with a transition circuit to realize load switching. Through cooperation of single-motor two-way selection driving and multi-shaft three-state logic combination, the mechanical transmission structure is greatly simplified, the voltage regulation gear number is increased at the same time, and the multi-shaft three-state logic combination-based voltage regulation device has the advantages of being compact in structure, small in size, high in reliability, low in cost and the like.