362 results about "Tap changer" patented technology

The invention discloses an on-load tap-changer vibration fault diagnosis algorithm based on tensor feature and adaptive weighted Stacking integration, relates to the technical field of on-load tap-changer fault diagnosis, and is used for improving the fault diagnosis precision. Comprising the following steps: S1, data acquisition; s2, feature extraction; the method comprises the following steps: extracting multi-scale time-frequency characteristics of an on-load tap-changer vibration signal by using wavelet scattering transform WST, and realizing low-rank decomposition and dimensionality reduction characterization of high-dimensional characteristics by combining a non-negative tensor decomposition model NTF; s3, fault diagnosis; a multi-base learner Stacking integration framework is adopted, and a prediction matrix is generated through K-fold cross validation; through a swarm intelligent optimization algorithm SRA, hyper-parameters and fusion weights of all base learners are adjusted, L2 regularization suppression over-fitting is introduced, and finally fault classification is realized by adopting a logic regression element learner with Softmax cross entropy. According to the invention, through fault diagnosis of multi-model adaptive fusion and optimization, the fault identification precision, stability and on-line monitoring capability are improved.

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 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 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 invention discloses a hybrid distributed power flow controller topological structure and a control method thereof. The topological structure comprises a distribution network Sen transformer DST and a distributed static synchronous series compensator DSSC. The distribution network Sen transformer DST comprises a three-phase double-winding transformer and an on-load tap changer group; each phase of the three-phase double-winding transformer comprises a main winding and a secondary winding, the high-voltage end of the three-phase main winding is connected with the head end of the three-phase distribution line, the low-voltage end of the three-phase main winding is in star connection, and the neutral point of the three-phase main winding is grounded; the on-load voltage regulation switch group comprises six on-load voltage regulation switches which are respectively configured on the low-voltage side of the three-phase main winding and the three-phase secondary winding and provide three-phase first compensation voltage in a cross series connection mode; a distributed static synchronous series compensator DSSC provides a three-phase second compensation voltage; and the three-phase first compensation voltage and the three-phase second compensation voltage are superposed to synthesize a three-phase compensation voltage, and the three-phase compensation voltage is injected into a three-phase distribution line through a three-phase isolation transformer. The invention provides a series hybrid topology consisting of a DST (Digital Subscriber Terminal) and a DSSC (Digital Subscriber Subscriber Center).

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 invention discloses a method and a system for judging an on-load tap-changer for a transformer. The method comprises the following steps of: 1, synchronously acquiring multi-source signals; step 2, signal preprocessing; step 3, multi-dimensional feature extraction; 4, generating a dynamic threshold value; step 5, state judgment; 6, self-adaptive compensation is carried out; step 7, backtracking historical data; and step 8, remote communication. According to the invention, multi-source signals are synchronously acquired, vibration and current signals are acquired by using an embedded sensor array, and the comprehensiveness and reliability of signal acquisition are improved; during signal preprocessing, denoising and time-frequency matrix construction are respectively performed on different signals, so that the signal quality is improved; in multi-dimensional feature extraction, four-dimensional feature vectors are formed, dynamic threshold generation is combined with multiple algorithms, and three-level alarm is triggered through state judgment; the self-adaptive compensation link adjusts the feature weight, supports historical data backtracking, and uploads a result through a Modbus-TCP protocol to guarantee the operation safety of a power grid.

The invention discloses an on-load tap-changer oil chamber pressure monitoring method for an extra-high voltage converter transformer. Comprising the steps of collecting pressure, environment and operation condition data, performing data cleaning and normalization processing, establishing a pressure prediction model, extracting features, selecting an algorithm optimization model, performing pressure monitoring and fault early warning, calculating deviation, judging abnormity, analyzing fault types and performing early warning. And during acquisition, various sensors are adopted and are preferably arranged. Data processing has a plurality of specific operations. The model adopts an optimization means of a bidirectional LSTM network. Fault analysis adopts a decision tree method and is combined with oil chromatography data verification, and a three-dimensional fault traceability technology is also added. Compared with the prior art, the method has the advantages that the prediction accuracy is improved by collecting the multi-dimensional data, the abnormity is timely found through real-time monitoring, the model performance is improved through data preprocessing, the phenomena of false alarm and missing alarm are reduced, and the accuracy and reliability of the monitoring result are improved.

The invention relates to a load transfer switch (1) for a load tap changer (2), comprising at least one vacuum interrupter (30), a handling element (50) which is mechanically connected to the vacuum interrupter (30) on a first end (51) and has a roller (53) on a second end (52), a handling body (10) which has a base body (11) and at least one cam (20), wherein the vacuum interrupter (30) is handled via the handling element (50) by the roller (53) being driven over the handling body (10), at least one part (21) of the cam (20) having a higher strength than the base body (11).

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 high-voltage load-tap switching device and relates to the technical field of tap switches. The high-voltage load-tap switching device comprises a switching mechanism, a driving mechanism and a recovery mechanism. The switching mechanism is used for completing tap switching of high voltage. The driving mechanism provides power for switching of the switching mechanism. In the application, the second moving contact is separated from the second static contact to generate an electric arc before the first moving contact is switched, and the arc is extinguished by triggering a pressure accumulator pump to release sulfur hexafluoride gas. The sulfur hexafluoride gas has the characteristics of cooling, ion removal and flameout prevention, and the arc is quickly extinguished to create an arcless environment for high-voltage switching of the first moving contact, thereby avoiding ablation of the contact by the arc and improving the safety of equipment operation. After the arc is extinguished, the negative pressure pump is triggered by meshing transmission of the internal gear and the rack to suck the sulfur hexafluoride gas in the left cavity into the recovery tank, so that the gas is quickly recovered. The economic loss caused by waste of the gas is reduced, the risk of equipment aging is lowered, and the service life of the equipment is prolonged.

The utility model discloses a simple on-load tap-changer switching core assembling structure which comprises a main shaft and a moving contact group. The moving contact group comprises a moving contact support plate, a transition contact, a contact and a resistance plate; the moving contact group sleeves the outer side of the main shaft; the main shaft is a spline shaft; the moving contact support plate is provided with a spline groove, and the spline groove is matched with the spline shaft, so that the moving contact support plate is fixed on the outer side of the main shaft. According to the utility model, a drilling process is canceled on the main shaft, a structure that the spline groove is matched with the spline shaft is adopted, and the moving contact support plate is fixed on the main shaft, so that the strength of the main shaft is ensured, the running reliability of the tap switch is improved, and meanwhile, the body health of operators is ensured.

To provide an automatic voltage balancing device and an automatic voltage balancing method that can improve a three-phase unbalanced voltage in a distribution line.SOLUTION: An automatic voltage balancing device is composed of a transformer portion and a control portion. The transformer portion connects a tap changer composed of a mechanical diverter switch and a tap selector in series with a distribution line, and the tap changer changes the tap while the transformer portion is being operated. When a substation is connected to a primary side, the control portion calculates an average value of a primary voltage of the tap changer, and controls the voltage such that a secondary voltage of each phase approaches the average value. When the substation is connected to a secondary side, the control portion calculates an average value of a secondary voltage of the tap changer, and controls the voltage such that the primary voltage of each phase approaches the average value.SELECTED DRAWING: Figure 1

An energy conversion device 100 for an electrolysis system (150) comprises: an adjustable transformer (101) having a primary side (102) connectable to an AC grid (103) via a point of common coupling, a secondary side (104) and a tap switch (105); a rectifier transformer (106, 107) having a primary side (108, 109) configured to provide a secondary side voltage differing by a predetermined phase shift; a thyristor rectifier unit (114, 115, 116, 117) forming a multi-pulse rectifier system (118) that receives the secondary side voltage and provides a DC current to the electrolyser unit (119, 120, 121, 122); and a protection controller unit 133 for connecting / disconnecting the device to / from the power grid as a function of a comparison of the secondary-side voltage to a corresponding secondary-side threshold voltage, where the multi-pulse rectifier system comprises a synchronization control circuit (123, 124, 125, 126) providing thyristor gate pulses at an emission angle synchronized with the secondary-side voltage, and a protection controller unit 133 for connecting / disconnecting the device to / from the power grid as a function of a comparison of the secondary-side voltage to a corresponding secondary-side threshold voltage. And wherein the respective secondary-side threshold voltage is determined from a nominal threshold voltage specified by a grid guideline at the point of common coupling and a physical transformer parameter adjusted according to tap switch position information (129).

The present invention discloses a method for monitoring an on-load tap changer transmission mechanism based on sparse filtering, which relates to the technical field of on-load tap changer transmission mechanism detection. The method involves performing multiple gear switching on the on-load tap changer to collect vibration signals of the transmission mechanism during the on-load tap changer switching process. A sparse filtering network-based vibration signal characteristic distribution matrix of the on-load tap changer transmission mechanism is calculated based on the vibration signals. The eigenvalues ​​and eigenvectors of the principal component components of the vibration signal characteristic distribution matrix are calculated. The weighted mean of the elements of the statistic and the corresponding control limits are calculated based on the eigenvalues ​​and eigenvectors of the principal component components of the characteristic distribution matrix. The mechanical state of the transmission mechanism is determined based on the weighted mean of the elements of the statistic and the corresponding control limits. The method of the present invention efficiently and accurately determines the mechanical state of the on-load tap changer transmission mechanism by performing real-time monitoring and computational analysis of the vibration signals of the transmission mechanism during the on-load tap changer switching process.

The present invention discloses a method, system, device and storage medium for high-frequency harmonic protection of a flexible direct current valve group. The method for high-frequency harmonic protection of a flexible direct current valve group calculates the harmonic components obtained in real time in a first frequency range, thereby avoiding the influence of transformer saturation and background harmonics when calculating the 2-7 harmonic components, and reducing the false triggering phenomenon of protection action output tripping; by prohibiting the gear adjustment of the commutator tap changer when the comprehensive value of the harmonic components is greater than the first threshold value and the first duration reaches the first delay, the harmonic protection performance is improved; by controlling the non-master control valve group to lock when the flexible direct current valve group is a flexible direct current dual-valve group and the second duration reaches the preset second delay, the equivalent impedance of the flexible direct current dual-valve group as a whole is changed, the resonance condition between the flexible direct current dual-valve group and the high-frequency harmonic system of the flexible direct current valve group is destroyed, the high-frequency resonance between the master control valve group and the system is exited, and the problem of simultaneous locking of the dual-valve group is avoided.

The utility model discloses a self-coupling phase-shifting transformer with a safe switching function, and particularly relates to the field of self-coupling phase-shifting transformers, which comprises an iron core, a high-voltage winding, a voltage-regulating winding, a public winding, a phase-regulating winding, a voltage-regulating on-load tap-changer, a phase-regulating on-load tap-changer and a no-load reversing tap-changer, the iron core comprises three central columns, and each central column is sequentially provided with a phase modulation winding, a voltage regulation winding, a common winding and a high-voltage winding from inside to outside. According to the utility model, when the potential of the tail end of the common winding is zero and the phase modulation on-load tap-changer is at a rated tap-changer position, the second electric mechanism of the no-load reversing tap-changer can be operated, and at the moment, the self-coupling phase-shifting transformer is at a zero phase angle position; the polarity conversion of the no-load commutation tap-changer can be ensured under the specific condition of zero phase angle, the safe operation of the no-load commutation tap-changer can be protected, and the safe switching is realized.

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.

The invention relates to a transformer state measurement method based on built-in optical fibers, and belongs to the technical field of transformer coil monitoring. The transformer state measurement method based on the built-in optical fiber comprises the following steps: manufacturing a copper bar embedded with the optical fiber, taking the copper bar embedded with the optical fiber as a part of a transformer coil, and fixing one end of the copper bar with a copper bar in a transformer winding coil, the other end of the optical fiber connector assembly is fixed with a transformer bushing joint or a transformer on-load tap-changer joint; an optical fiber connector assembly is arranged on the transformer casing; one end of the optical fiber in the copper bar embedded with the optical fiber is pulled to the outside of the copper bar and is connected with the optical fiber connector assembly, the optical fiber connector assembly is connected with information parameter detection equipment outside the transformer, and the information parameter detection equipment processes signals transmitted back by the optical fiber in real time. Feature information reflecting the state of the transformer coil is extracted, the feature information of the state of the transformer coil comprises temperature information and vibration information of the transformer coil, and measurement of the state of the transformer coil is completed.

The utility model relates to a kind of tap lead arrangement structure of on-load voltage regulating transformer, including transformer, oil tank, on-load tap changer, A phase connecting line, B phase connecting line and C phase connecting line, on-load tap changer is arranged in the long axis direction of transformer and close to A phase winding outside, on-load tap changer separately provides A phase, B phase and C phase tap contact, A phase connecting line is connected to A phase tap contact after being led out from A phase high-voltage winding tap;B phase connecting line is led to transformer body lower clamp again along horizontal direction through lead clamp to on-load tap changer lower part, again vertically upwardly connected to B phase tap contact after being led out from B phase high-voltage winding tap vertically downwardly;C phase connecting line is led to transformer body lower clamp again along horizontal direction through lead clamp to on-load tap changer lower part, again vertically upwardly connected to C phase tap contact after being led out from C phase high-voltage winding tap vertically downwardly.The utility model can reduce the distance between winding and tank wall, solve the problem of large volume and heavy weight of transformer.

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.