48 results about "Three phase transformer" patented technology

A bidirectional DC-DC conversion apparatus and a charging pile. The bidirectional DC-DC conversion apparatus includes a first power conversion circuit, a second power conversion circuit, a three-phase transformer, three phase resonant circuits, a resonant switching switch circuit, and an inductor circuit. Each phase of resonant circuit includes a first capacitor and a first inductor that are connected in series. One end of each phase of resonant circuit is connected to the first power conversion circuit, and the other end of each phase of resonant circuit is connected to the second power conversion circuit via the three-phase transformer. The resonant switching switch circuit is configured to connect a circuit between either of two ends of each phase of resonant circuit and the inductor circuit to enable each phase of resonant circuit and the inductor circuit to form an LLC resonant circuit.

The application provides a residual magnetism estimation method and device for a three-phase transformer and electronic equipment. The estimation method comprises: for any single-phase transformer in the three-phase transformer, obtaining the voltage amplitude U m , the angular frequency ω of the power supply and the primary-side coil turn number N1; calculating the residual magnetism amplitude Φ m according to the voltage amplitude U m and the angular frequency ω of the power supply in combination with formula (1); obtaining the voltage closing angle α, the opening-starting time t open and the opening-ending time t open + Δt of the single-phase transformer at no-load opening; and calculating the residual magnetism Φ r of the single-phase transformer after opening according to the residual magnetism amplitude Φ m , the voltage closing angle α, the opening-starting time t open and the opening-ending time t open + Δt in combination with formula (2). The application calculates the residual magnetism Φ r of the single-phase transformer after opening in combination with formula (2), thereby replacing the complex integral term containing U C , reducing the calculation difficulty, and optimizing the accuracy of the residual magnetism estimation method for the transformer.

The application discloses a kind of traction network impedance simulation system and control method based on voltage source converter, and main substation is simulated by three-phase transformer, and traction substation is simulated by single-phase transformer.Three-phase transformer steps down power supply voltage, and the voltage on the high-voltage side of the single-phase transformer of the traction substation group comes from the same two-phase voltage of the three-phase transformer, which supplies the traction network after stepping down the voltage. Among them, for the impedance simulation of the traction network, the movement of the train is equivalent to the change of the line impedance, and the VSC is used to simulate the impedance of the traction network. The VSC is used to realize the change of the impedance of the traction network on both sides of the train during the train operation. The VSC device is used to simulate the impedance of the traction network on both sides of the train during the train operation, and relevant researchers can use the invention to carry out experimental verification of the related theory of the new type of substation group bilateral traction power supply system, and promote the development of the new type of substation group bilateral traction power supply technology.

The utility model discloses a transformer winding and three-phase transformer relates to transformer technical field, the transformer winding includes the two coil that distributes along the vertical direction, the opposite end face of two coil is both the meshing surface, each meshing surface protrudes towards the other meshing surface to form a plurality of protrusions, the multiple protrusions are distributed in the circumferential direction of the corresponding meshing face at intervals, a groove is formed between any two adjacent protrusions on each meshing face, the multiple protrusions of any meshing face and the multiple grooves of the other meshing face are consistent in number and correspond to each other in a one-to-one mode, and the correspondingly-arranged protrusions and the grooves are matched in shape. And the bulges on one meshing surface are inserted into the corresponding grooves on the other meshing surface, so that the two coils are meshed. According to the transformer winding, when the upper coil and the lower coil are in butt joint, the protrusions of the upper coil are inserted into the grooves of the lower coil, so that the upper coil and the lower coil are tightly attached, the upper coil and the lower coil can be effectively prevented from shaking relatively in the transportation process, and reliability is better.

The application provides a short-circuit protection method and device for a transformer. The short-circuit protection method comprises: obtaining output voltages of a plurality of output lines of at least one winding on a low-voltage side of the transformer; performing real-time calculation and short-circuit judgment according to the output voltages, and sending a protection signal when the short-circuit is judged. The short-circuit protection device comprises: a voltage obtaining unit for obtaining output voltages of a plurality of output lines of at least one winding on a low-voltage side of the transformer; a short-circuit judgment unit for performing real-time calculation and short-circuit judgment according to the output voltages, and sending a protection signal when the short-circuit is judged; and a controllable circuit breaker arranged on a high-voltage side of the transformer and connected with the short-circuit judgment unit, for cutting off the connection between the transformer and a power grid after receiving the protection signal. The application provides a short-circuit protection method and device based on voltage characteristics, realizes short-circuit protection of a three-phase transformer through line voltage detection, greatly reduces the protection cost, and improves the protection reliability.

The application discloses a high-power synchronous motor test system, which comprises a test motor M1, a test motor M2, an auxiliary test motor M3, a three-phase transformer, a first variable-frequency power supply, a second variable-frequency power supply and a voltage sensor. The test motor M1 is coaxially connected with the test motor M2, and the auxiliary test motor M3 is coaxially connected with the test motor M1. The first variable-frequency power supply is circuit-connected with the auxiliary test motor M3, so that the auxiliary test motor M3 drives the test motor M1 and the test motor M2 to synchronously rotate. The output end of the second variable-frequency power supply is circuit-connected with the primary side of the three-phase transformer. The alternating current end of the test motor M1 is circuit-connected with one end of the three open windings of the secondary side of the three-phase transformer. The other ends of the three open windings of the secondary side of the three-phase transformer are circuit-connected with the alternating current end of the test motor M2. The second variable-frequency power supply acquires the three-phase voltage signal of the alternating current end of the test motor M1 through the voltage sensor. The application reduces the test cost and reduces the harmonic influence.

The application discloses a high-voltage direct-current converter topology and a control method thereof, and belongs to the technical field of power generation, power transformation or power distribution. The topology is composed of a high-voltage side filter inductor, a three-phase MMC inverter circuit, a three-phase leakage inductor, a three-phase transformer, a three-phase diode rectifier circuit, a medium-voltage side filter inductor and a medium-voltage side filter capacitor. The topology structure of the application can realize higher reliability, lower cost and smaller size by the relatively mature high-voltage side modular structure and the medium-voltage side diode series connection technology. By precisely controlling the three-phase current to be a positive-negative half-cycle symmetrical trapezoidal current, reliable commutation of the three-phase rectifier diode is realized, and meanwhile, smooth direct-current is synthesized on the high-voltage side and the medium-voltage side, so that the operation efficiency of the converter and the port power quality are significantly improved, and the filter size is reduced.

To provide a power supply switching device.SOLUTION: A first power supply and a second power supply having three phase alternating current power, a first power switch group, a second power switch group, and a three phase transformer, wherein the three phase transformer comprises a first winding, a second winding, and a third winding arranged in a delta connection configuration to form a first common node, a second common node, and a third common node, the first common node is connected to the first switch and the fourth switch, and the second common node is connected to the second switch and the fifth switch; The third common node is connected to the third switch and the sixth switch.SELECTED DRAWING: Figure 1

The invention relates to the technical field of power equipment state evaluation, and discloses a three-phase transformer state evaluation method, system, equipment and medium, and the method comprises the steps: collecting the frequency-amplitude response data of each phase winding of a three-phase transformer; dividing at least two characteristic sensitive frequency bands, wherein the frequency bands respectively correspond to core components of the transformer; extracting difference characterization characteristic parameters of each phase and each frequency band, and calculating a three-phase imbalance coefficient; and generating a dynamic threshold value based on the operation condition of the transformer and historical data, performing multi-level state evaluation in combination with the deviation degree of the unbalance coefficient and the threshold value, and positioning an abnormal phase. The method breaks through the limitation of a traditional fixed threshold value and a single feature, adapts to different operation scenes through the dynamic threshold value, expands feature parameter types and frequency band configuration flexibility, achieves state accurate grading and anomaly tracing, solves the problems that a traditional method is poor in adaptability and narrow in protection range, and remarkably improves the evaluation universality and the intelligent level.

A power switching system, comprising a first power source and a second power source each having three-phase AC power. The power switching system comprises a first power switch group, a second power switch group, and a three-phase transformer. The three-phase transformer comprises a first winding, a second winding, and a third winding, the first winding, the second winding, and the third winding being connected in a delta configuration to form three common connection points. The first common connection point is connected to a first switch and a fourth switch, the second common connection point is connected to a second switch and a fifth switch, and the third common connection point is connected to a third switch and a sixth switch.

The invention discloses a capacitance equivalent modeling method for lightning stroke response of a triangular connection side of a three-phase transformer, and the method comprises the steps: forming a triangular topology for a three-phase coupling network model based on the ground capacitance and turn-to-turn capacitance of a winding at the triangular connection side through node connection, precisely simulating the inter-phase coupling in a lightning stroke transient state, and obtaining the lightning stroke response of the triangular connection side; the method can effectively reflect the high-frequency capacitance characteristics of the triangular connection side of the three-phase transformer, determines the capacitance parameters of the three-phase coupling network model through the frequency domain impedance measurement and capacitance calculation mathematical model, improves the accuracy of the capacitance parameters, provides a more reliable basis for lightning stroke protection design, and improves the reliability of lightning stroke protection design. The technical problem that the prediction precision is insufficient in a high-frequency transient state due to the fact that existing transformer lightning stroke modeling neglects the inter-phase coupling effect in triangular connection of a three-phase transformer and does not fully consider the complex influence of a winding series-parallel connection structure on capacitance parameters is solved.

1 Designation Railway power supply system 27.5 kV, 50 or 60 Hz for long-distance rail traffic, measures to improve load symmetry in the feeding high-voltage network. 2 Summary 2.1 Technical Problem Conventional electrical substations for the power supply of long-distance railways at 27.5 kV / 50 Hz or 60 Hz cause a non-negligible negative feedback effect in the feeding high-voltage system 21 due to unbalanced loads. 2.2 Solution to the Problem Instead of the conventional V-connection of two single-phase transformers in a railway power system 2 x 27.5 kV, 50 Hz or 60 Hz, the use of two three-phase transformers T21 and T22 with connection groups Dz0 and Dz4 or Zd0 and Zd8 is proposed as a solution. See the attached drawing Figure 5 2 for an example.3. Application Areas The primary application area is the 2 x 27.5 kV / 50 Hz or 60 Hz power supply for electric railways in long-distance operation, relevant IPC classifications: B60L 3 / 00, B60M 3 / 00, H02J 3 / 26, H02M 5 / 10. Furthermore, it is applicable in electrometallurgy, relevant IPC classifications: H05B 7 / 00, H02J 3 / 26, H02M 5 / 10. Other larger single-phase or unbalanced electrical loads supplied from three-phase networks. Figure 5 shows, as one of the solution approaches, the structure of a typical substation in a simplified representation, with transformers T21 or T22, Zd8 or Zd0 connected.

The invention relates to the technical field of protection equipment in a three-phase alternating-current power distribution or transmission system, in particular to a series-connection type hybrid circuit breaker applied to a three-phase alternating-current power system and a using method, and the series-connection type hybrid circuit breaker comprises a main alternating-current circuit and a circuit breaker unit connected with the main alternating-current circuit in series; the circuit breaker unit comprises a three-phase transformer, a power electron injection branch and a mechanical switch module; the power electron injection branch is connected with the three-phase transformer, and the mechanical switch module is arranged between the three-phase transformer and the main alternating current circuit. The beneficial effects of the invention are that the transformer is coupled in the main loop to induce the voltage with the polarity opposite to that of the power supply, and reverse voltage injection is realized, so that the fault current is rapidly suppressed in a microsecond level; the fault current is modulated into the high-frequency alternating-current ripple current close to zero by using the rapid mode switching of the power electronic branch, so that the action window of the mechanical switch is expanded, and the arc-free interruption is realized.

A method of manufacturing a first toroid 214, comprising: unspooling a strip 210 from a first spool 202 which has a longitudinal axis; during unspooling, cutting the strip (cutters 206, e.g laser / mechanical) into a first oval (ellipse) 212 having one axis of symmetry parallel to longitudinal axis of strip; and winding the first oval onto a second spool 204 (mandrel, reel) to form the first toroid 214, all actions occurring preferably contemporaneously. During unspooling, the strip may be cut into a second oval 212 having one axis of symmetry, which is also parallel to the longitudinal axis of the strip; and winding the second oval onto a third spool. This may directly form a second toroid or a second toroid may be formed by spooling from the third to a fourth spool. The first and second ovals may be parallel to one another and form a tessellated shape when viewing the strip in plan view. The strip may be a strip of material having a high magnetic permeability such as bond coated electrical steel. One embodiment also describes a toroid manufactured using the method. The one or more toroids may be used as magnetic core formers for electrical devices (e.g transformers, inductors, motors). May be used to form three phase transformers by joining toroids cut into equal parts (see figures 6A-C). Figures 3A and 4

The application discloses a kind of low-voltage towed cable insulation on-line monitoring device, and towed cable is respectively connected with the low-voltage output end of three-phase transformer and equipment, comprising: signal generation module, neutral point module, current detection module and controller, wherein, the first output end of signal generation module is electrically connected with the neutral point end of neutral point module, and the second output end of signal generation module is electrically connected with ground end by grounding resistance;The output end of neutral point module is electrically connected with the first end of towed cable;Current detection module is connected with first cable, and the output end of current detection module is electrically connected with the input end of controller, wherein, the first cable is the cable connected between the first output end of signal generation module and the neutral point end of neutral point module.This application generates signal and existing signal frequency isolation in cable, there is no interference signal, measurement signal value is relatively larger, easy to measure, and acquisition value is more accurate, so it can accurately detect the insulation condition of towed cable.

A method of performing a circuit opening and closing operation in a power system including three phases, a three-phase transformer, and a circuit breaker system, the method including a) opening all three phases simultaneously such that a reference current of a reference phase is interrupted first at a first current zero crossing after the opening; and b) closing all three phases simultaneously at a phase to ground voltage of the phase lagging the reference phase by 120°, in a time range of ±90° from a negative peak of said phase to ground voltage if the current zero crossing is a positive current zero crossing, or in a time range of ±90° from a positive peak of said phase to ground voltage if the current zero crossing is a negative current zero crossing.

The invention discloses a three-phase transformer iron core joint optimization design method, relates to the technical field of three-phase transformer design, and solves the problems that in the prior art, only no-load working conditions are considered, and the design of butt joints and gaps of the butt joints under different load working conditions are not considered. According to the method, the geometrical shape of the joint at the joint of the iron cores of the three-phase transformer is determined, main parameters related to joint design are determined based on the geometrical shape, then the joint at the joint of the iron cores of the three-phase transformer is designed and modeled, and a joint model at the joint of the iron cores of the three-phase transformer is obtained. An improved particle swarm optimization algorithm is adopted to carry out optimization design on a three-phase transformer iron core joint. A new joint geometrical shape is designed by utilizing the technology, design modeling optimization is performed on the joint of the iron core of the transformer, and meanwhile, optimization iteration is performed on various parameters of the joint of the iron core by improving the particle swarm optimization, so that the minimum loss in the three-phase transformer is obtained, and a reasonable design scheme is provided for the transformer.

An exemplary transformer includes an exciter unit (EU) and a compensation voltage unit (CVU). The EU includes a three-phase transformer having a parallel Y-connected primary winding. The CVU includes a plurality of series-connected secondary windings having one secondary winding from each phase of the EU and a plurality of on-load tap-changers. Each on-load tap changer is associated with a group of secondary windings, the group of secondary windings including one secondary winding per phase from the EU. Each secondary winding in the group of secondary windings is a same distance from an associated primary winding of the EU. All the secondary windings, the sub-windings between two consecutive taps, and the primary winding have similar heights. The sub-windings can be staggered or not staggered. Each on-load tap changer may vary the number of effective turns of the associated group of secondary windings by connecting to one of the plurality of taps associated with each secondary winding according to the selected operating point.

The present application relates to offshore wind power low-frequency power transmission technical field, especially to a kind of wind power frequency conversion fault-tolerant system and starting control method based on coaxial double machine, system includes: coaxial direct connection synchronous motor and synchronous generator, synchronous motor and synchronous generator are realized frequency conversion by pole pair number ratio;Three-phase transformer, including one three-phase input and two three-phase output, wherein three-phase input adopts delta connection, and three-phase output adopts star connection and delta connection respectively;Excitation module, including three input, four IGBT modules, two capacitor modules and two output;Starting module, including six input, four thyristor units, eighteen switch units, one inductance and three output;State switching switch module, including eight physical switches.Effectively solve the problem of large charging reactive power and high loss of wind power through sea cable transmission, fill the short board of power frequency ac transmission and flexible dc transmission.

This application provides a bidirectional DC-DC converter and a charging pile. The bidirectional DC-DC converter includes a first power conversion circuit, a second power conversion circuit, a three-phase transformer, a three-phase resonant circuit, a resonant switching circuit, and an inductor circuit. Each phase resonant circuit includes a first capacitor and a first inductor connected in series. One end of each phase resonant circuit is connected to the first power conversion circuit, and the other end of each phase resonant circuit is connected to the second power conversion circuit through the three-phase transformer. The resonant switching circuit is used to connect either end of each phase resonant circuit to the inductor circuit, so that each phase resonant circuit and the inductor circuit form an LLC resonant circuit. This application can improve the voltage regulation range and power conversion efficiency of the bidirectional DC-DC converter during bidirectional power transmission, thereby achieving wide voltage range and high-efficiency input or output.

The invention discloses a method and system for measuring transformer loss through a differential pressure and differential current method. The method comprises the steps that loss measurement of a three-phase transformer is conducted through the improved differential pressure and differential current method; for three-phase transformers of different models, calculating total iron loss and total copper loss of the three-phase transformers through instantaneous power integration according to the models and the measured differential voltage and differential current, and adding the total iron loss and the total copper loss to obtain total loss; the uncertainty of the relative measurement of the improved differential pressure and differential current method is obtained through root-mean-square calculation, a self-adaptive uncertain threshold value is calculated according to the input power and the output power of the three-phase transformer, if the uncertainty of the relative measurement of the improved differential pressure and differential current method is smaller than or equal to the self-adaptive uncertain threshold value, it is judged that the loss measurement is reliable, and if not, it is judged that the loss measurement is reliable. Otherwise, a differential current detection mutual inductor and a differential pressure detection mutual inductor with higher precision are adopted, and the improved differential pressure and differential current method is adopted again to carry out loss measurement on the three-phase transformer. According to the invention, the loss measurement precision of the transformer is improved.

The invention discloses a rail transit rectification transformer traction power supply system and an anti-misoperation locking method thereof, and the system comprises a high-voltage grounding device, a low-voltage grounding device, a high-voltage detection device, a comprehensive control device, and a three-station disconnecting link, a circuit breaker and a three-phase transformer which are sequentially connected in series. The high-voltage grounding device and the low-voltage grounding device are arranged on the high-voltage side and the low-voltage side of the three-phase transformer respectively, the comprehensive control device is connected with the three-station disconnecting link, the high-voltage detection device, the high-voltage grounding device and the low-voltage grounding device, the high-voltage detection device is further connected with the high-voltage side of the three-phase transformer, and a low-voltage detection assembly is arranged in the low-voltage grounding device. The comprehensive control device carries out anti-misjudgment on high-low voltage grounding operation, controls the high-voltage grounding device and the low-voltage grounding device to be switched on in sequence, carries out anti-misjudgment on high-low voltage dismounting grounding operation, and controls the low-voltage grounding device and the high-voltage grounding device to be switched off in sequence. According to the technical scheme, the safety and reliability of maintenance operation are remarkably improved.

An electrical substation that transforms AC voltage to DC voltage is configurable between a current-source mode for charging batteries of a stationary work machine and a voltage-source mode for powering motors of a moving work machine. The substation receives medium-voltage AC power from a grid and includes a pair of DC power converters each formed from three-phase transformers and a single stage of silicon-controlled rectifier units. Adjustable connectors enable combining the power converters in parallel or keeping them separate to operate in the current-source mode for charging the machine batteries with up to 4800ADC at 6 MW or for providing up to 1500VDC in powering voltage. The connectors further enable combining the power converters in series to operate in the voltage-source mode for powering the machine motors with up to 3000VDC at 6 MW. Sized to fit within a standard high-cube ISO shipping container with minimal components, the portable substation provides versatility with high power density and low cost per kilowatt.

The utility model relates to the technical field of load power regulation, and particularly discloses a device for simulating load power, which comprises an air switch, a three-phase transformer, three single-phase alternating-current ammeters, a potentiometer, a current transformer and a three-phase anti-reflux ammeter, the air switch is connected with the three-phase transformer, the three-phase transformer is connected with the three single-phase alternating-current ammeters, and the three single-phase alternating-current ammeters are connected with the potentiometer. Each single-phase alternating-current electric meter is connected with a potentiometer, and a current transformer collects the current value of the potentiometer and outputs a current signal to the three-phase anti-countercurrent electric meter. According to the utility model, under the condition that the load power change is not obvious, the condition that the load power change is relatively large can be simulated, and the load power variation can be simulated to be adjusted as required, so that the anti-reflux and demand protection function test of a new energy storage product becomes more convenient.

This invention provides a current source system and current source control method for green hydrogen production, including a new energy AC power generation system, a new energy DC power generation system, an AC current source converter, a DC current source converter, a three-phase transformer, a single-phase transformer, and an impedance-controlled and stabilizing load. The impedance-controlled and stabilizing load includes a controlled-adjustable variable impedance device and an electrolyzer. The new energy AC power generation system is connected to the AC power source converter via the three-phase transformer. The new energy DC power generation system is connected to the DC current source converter via the single-phase transformer. The impedance-controlled and stabilizing load is connected to both the AC and DC current source converters. The three-phase and single-phase transformers achieve voltage level transformation between the power generation system and the current source converter to meet the control of the current and power of the electrolyzer in the impedance-controlled and stabilizing load. This invention can achieve reliability and safety in hydrogen production from renewable energy sources at the refinery level.

An electrical substation (200) that transforms AC voltage to DC voltage is configurable between a current-source mode for charging batteries (154) of a stationary work machine (100) and a voltage-source mode for powering motors (150) of a moving work machine. The substation receives medium-voltage AC power from a grid and includes a pair of DC power converters each formed from three-phase transformers (304, 324) and a single stage of silicon-controlled rectifier units (308, 328). Adjustable connectors (S1-S9, 650, 652, 654, 656, 658, 660, 662) enable combining the power converters in parallel or keeping them separate to operate in the current-source mode for charging the machine batteries with up to 4800ADC at 6MW or for providing up to 1500VDC in powering voltage. The connectors further enable combining the power converters in series to operate in the voltage-source mode for powering the machine motors with up to 3000VDC at 6MW. Sized to fit within a standard high-cube ISO shipping container with minimal components, the portable substation (200) provides versatility with high power density and low cost per kilowatt.

The utility model discloses a combined three-phase transformer. The combined three-phase transformer comprises a first transformer, a second transformer, a third transformer, a first input terminal strip and an output terminal strip, the first transformer, the second transformer and the third transformer are horizontally arranged and are single-phase transformers; a first end of an input winding of the first transformer, a first end of an input winding of the second transformer and a first end of an input winding of the third transformer are respectively connected with a first terminal of the first input terminal strip; the first end of the output winding of the first transformer, the first end of the output winding of the second transformer and the first end of the output winding of the third transformer are connected with the three terminals of the output terminal strip respectively, the combined three-phase transformer is small in size and lower in height, and space can be effectively saved; and a larger heat dissipation space is reserved above the combined three-phase transformer, so that heat dissipation is more convenient, and the heat dissipation efficiency and the use safety are improved.

A power supply apparatus, a three-phase transformer circuit, and a charging pile. The power supply apparatus includes a turns ratio switching circuit, a connection relationship switching circuit, a three-phase transformer, and two three-phase rectifier bridge circuits. A three-phase primary winding of the three-phase transformer is configured to receive a three-phase alternating current. A three-phase secondary winding of the three-phase transformer is configured to output a three-phase alternating current to each of the two three-phase rectifier bridge circuits. A running mode of the three-phase transformer includes a first turns ratio mode and a second turns ratio mode. The turns ratio switching circuit is configured to switch a quantity of turns of the three-phase primary winding, to switch the running mode of the three-phase transformer.

An electronic component comprising a magnetic circuit, two electrical conductors each having a portion arranged around a single part of the magnetic circuit, each of the portions forming a winding between a first and a second end, these two windings being inductively coupled to each other via the magnetic circuit. A support for the two electrical windings is arranged between the electrical conductors and the part of the magnetic circuit. The support incorporates a guiding system for guiding at least one of the two electrical conductors outside the electrical winding that it defines.

The utility model relates to the field of transformer fault diagnosis, concretely relates to a device that simulates transformer winding deformation defect, and the device includes three -phase transformer, wherein: the high voltage winding of the first phase of three -phase transformer has the insulating support strip along the axial arrangement in the coil of the first preset layer number, the coil of the preset number of turns of the tail of at least one end of the low voltage winding of the second phase is freely wound, at least one end of the high voltage winding of the second phase is equipped with height adjusting block, is used for adjusting the height of the coil in the high voltage winding, to make the low voltage winding and the high voltage winding of the second phase exist axial displacement, the high voltage winding and the low voltage winding of the third phase are normally arranged, the outgoing line of the high voltage winding and the low voltage winding of each phase of three -phase transformer is led to the outer end of three -phase transformer box body, the device that simulates transformer winding deformation defect of the utility model sets up different defect types in different phases, can realize the decoupling between winding different type defects, is helpful to the influence of each kind winding deformation defect to transformer.