Integrated distribution transformer comprehensive test system

Abstract

The invention discloses a comprehensive test system for an integrated distribution transformer, and relates to the technical field of transformer testing. The problem of test comprehensiveness is solved. The conventional test module comprises a direct current resistance test module, a transformation ratio measurement module and an insulation test module; the no-load test module adopts a variable-frequency power supply as a power supply, the output frequency of the variable-frequency power supply has two gears of 50-60Hz / 150-200Hz, the output voltage of the variable-frequency power supply has two gears of 500V / 1000V, the variable-frequency power supply is a square-wave power supply, and an LC filtering device is arranged at the output end of the electric-frequency power supply; and the load temperature rise test module is used for testing the transformer under different loads. According to the invention, direct-current resistance test, transformation ratio measurement, insulation test, no-load test, load temperature rise test and the like can be carried out on the to-be-tested transformer, omnibearing test of the transformer can be realized, the integration degree is high, the occupied area is small, and movement is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer testing, and in particular to an integrated distribution transformer comprehensive testing system. Background Art

[0002] A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. Its main functions include voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization (magnetic saturation transformer), etc. Transformers need to be tested before leaving the factory or after maintenance to ensure their reliable operation.

[0003] After searching, the Chinese patent publication number CN102692577A discloses a high-power high-frequency transformer testing system, including a three-phase voltage regulator, a three-phase rectifier, a power inverter, a drive circuit, a control circuit, a no-load tester, a temperature tester, an oscilloscope and a Hall element. The three-phase voltage regulator connected to the three-phase mains is connected to the high-frequency transformer to be tested through the three-phase rectifier, the power inverter and the Hall element in sequence; the control circuit is connected to the power inverter through the drive circuit; an oscilloscope is provided on the Hall element, and the no-load tester is arranged between the Hall element and the high-frequency transformer to be tested; the temperature tester is arranged on the high-frequency transformer to be tested.

[0004] The above patent has the following shortcomings: the items measured are relatively single and cannot achieve comprehensive testing.

[0005] To this end, the present invention proposes an integrated distribution transformer comprehensive test system. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an integrated distribution transformer comprehensive test system.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] An integrated distribution transformer comprehensive test system, comprising:

[0009] Conventional test module, which includes DC resistance test module, ratio measurement module and insulation test module;

[0010] The no-load test module uses a variable frequency power supply as the power supply. The output frequency of the variable frequency power supply has two gears of 50-60Hz / 150-200Hz, and the output voltage has two gears of 500V / 1000V. The variable frequency power supply is a square wave power supply, and an LC filter device is provided at the output end of the electric frequency power supply.

[0011] Load temperature rise test module, which tests the transformer under different loads and obtains the transformer temperature through thermocouples;

[0012] A computer operation port, which can be connected to a computer for communication, and the port is electrically connected to a conventional test module, a no-load test module, and a load temperature rise test module;

[0013] A connection port, which is used for electrical connection between a DC resistance test module, a ratio measurement module, an insulation test module, a no-load test module, a load temperature rise test module and the transformer to be tested;

[0014] The cabinet is used to accommodate the hardware components of the integrated distribution transformer comprehensive test system.

[0015] Preferably: the load temperature rise test module includes a shell installed on the inner wall of the cabinet, a variable load mechanism arranged on the inner wall of the shell, a load switching mechanism for switching the load size of the variable load mechanism, and a speed regulating mechanism arranged on the outer wall of the shell and controlling the speed of the load switching mechanism.

[0016] Furthermore: the variable load mechanism includes a shell two fixed to the inner wall of the shell one, multiple groups of multi-dimensional loads fixed to the outer wall of the shell two, and multiple groups of electrode switch components symmetrically arranged on both sides of the inner wall of the shell two. The number of the electrode switch components is twice the number of the multi-dimensional loads, and every two groups of symmetrically arranged electrode switch components cooperate with one of the multi-dimensional loads. The bottom of the shell two is slidably connected with a slide, and the inner walls on both sides of the symmetrical side of the slide are fixedly embedded with electrode sheets one, and the slide cooperates with the load switching mechanism in transmission.

[0017] On the basis of the above scheme: the electrode switch assembly includes a sliding electrode and a fixed electrode, the fixed electrode is fixed to the inner wall of the shell two, the sliding electrode is slidably connected to the inner wall of the sliding electrode, the sliding electrode is connected to the shell two through an insulating spring, all the outer walls of the fixed electrodes on the same side are fixed and electrically connected to the same electrode sheet two, and the electrode sheets two on both sides are connected to the two ends of the multi-dimensional load.

[0018] A better solution among the above solutions is that the multi-dimensional load is a combination of an inductive load, a capacitive load and a resistive load.

[0019] As a further solution of the present invention: the load switching mechanism includes a turntable connected to an inner wall of the shell through a main shaft rotation and an electric motor fixed to a side wall of the shell by bolts, the output shaft of the motor is connected to the end of the main shaft through a coupling, the inner wall of the turntable is provided with a cam groove, the inner wall of the slide is fixed with a limiting column, and the limiting column is movably limited and matched with the inner wall of the cam groove.

[0020] At the same time, the cam groove is composed of a plurality of concentric circles with different diameters which are transitionally connected in sequence.

[0021] As a preferred embodiment of the present invention: the other end of the turntable is buckled with a torsion spring, and the other end of the torsion spring is buckled with the inner wall of the housing.

[0022] At the same time, the speed adjustment mechanism includes a magnetic core fixed to one side wall of the shell through an insulating frame, and a primary coil and a secondary coil respectively wound on both sides of the magnetic core, the primary coil is connected to an AC power supply arranged in the system, the outer wall of the shell is fixed with a bracket by bolts, the inner wall of the bracket is slidably connected with a slider through a guide rod, the side wall of the slider is fixed with an electrode head, the electrode head contacts and electrically conducts with the outer wall of the secondary coil, one end of the secondary coil and the electrode head are respectively connected to the power supply terminals of the motor.

[0023] As a more optimal solution of the present invention: a reset spring is buckled on one side of the slider, the other end of the reset spring is buckled on one side wall of the bracket, a permanent magnet is fixed on the other side of the slider, an electromagnet opposite to the permanent magnet is fixed on the other side wall of the bracket, the electromagnet has the same magnetic pole as the permanent magnet on the opposite side; the electromagnet is connected to the main circuit of the load circuit of the transformer to be tested.

[0024] The beneficial effects of the present invention are:

[0025] 1. The present invention can perform DC resistance test, ratio measurement, insulation test, no-load test, load temperature rise test, etc. on the transformer to be tested, and can realize all-round experiments on the transformer, with high degree of integration, small footprint and easy mobility.

[0026] 2. The present invention, on the one hand, by setting a plurality of multi-dimensional loads, the size of the load connected to the transformer to be tested can be controlled by the movement of the slide, so that the temperature rise test of the transformer under different load conditions can be performed; on the other hand, the multi-dimensional load is a combination of an inductive load, a capacitive load and a resistive load, so that it can match the actual load condition of the transformer and increase the accuracy of the test.

[0027] 3. The present invention switches the load size by setting a load switching mechanism, so that after a start and close signal is input to the motor, the load can be increased step by step. When switching between multiple load levels, there is no need to control each switch, thereby simplifying the control logic. At the same time, the continuous test time under different loads can also be controlled by the speed of the motor.

[0028] 4. The present invention, by setting a speed adjustment mechanism, can reduce the test time accordingly when the load is larger, thereby preventing abnormal damage to the transformer caused by long-term high load. At the same time, by using a clever "transformer" and circuit setting, the speed of the motor can be matched with the current size of the transformer load circuit to be tested, and the speed of the motor can be matched with the load size, thereby achieving the function of adaptively and automatically adjusting the test time according to the load size. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of an integrated distribution transformer comprehensive test system proposed by the present invention;

[0030] Figure 2 A schematic diagram of the structure of a load temperature rise test module of an integrated distribution transformer comprehensive test system proposed by the present invention;

[0031] Figure 3 A schematic diagram of the structure of a variable load mechanism of an integrated distribution transformer comprehensive test system proposed by the present invention;

[0032] Figure 4 The present invention proposes an integrated distribution transformer comprehensive test system Figure 3 The enlarged structural diagram of part A in the middle;

[0033] Figure 5 The load switching mechanism structure of an integrated distribution transformer comprehensive test system proposed by the present invention is shown in FIG. Figure 1 ;

[0034] Figure 6 The load switching mechanism structure of an integrated distribution transformer comprehensive test system proposed by the present invention is shown in FIG. Figure 2 ;

[0035] Figure 7 A schematic diagram of the speed regulating mechanism structure of an integrated distribution transformer comprehensive test system proposed by the present invention;

[0036] Figure 8 The present invention provides a circuit diagram of an integrated distribution transformer comprehensive test system and a load temperature rise test signal transmission diagram.

[0037] In the figure: 1. cabinet; 2. insulation test module; 3. ratio test module; 4. conventional test module; 5. DC electronic test module; 6. connection port; 7. load temperature rise test module; 8. no-load test module; 9. computer operation port; 10. shell one; 11. speed adjustment mechanism; 12. load switching mechanism; 13. variable load mechanism; 14. slide; 15. electrode piece one; 16. electrode switch assembly; 17. multi-dimensional load; 18. sliding electrode; 19. insulating spring; 20. fixed electrode; 21. electrode piece two; 22. turntable; 23. limit column; 24. cam groove; 25. spindle; 26. motor; 27. torsion spring; 28. primary coil; 29. ​​magnetic core; 30. secondary coil; 31. electrode head; 32. slider; 33. reset spring; 34. bracket; 35. guide rod; 36. electromagnet; 37. permanent magnet; 38. shell two. DETAILED DESCRIPTION

[0038] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] Embodiment 1:

[0041] An integrated distribution transformer comprehensive test system, such as Figure 1 -shown, which includes:

[0042] Conventional test module 4, which includes DC resistance test module 5, ratio measurement module 3 and insulation test module 2;

[0043] The no-load test module 8 adopts a variable frequency power supply as the power supply. The output frequency of the variable frequency power supply has two gears of 50-60Hz / 150-200Hz, the output voltage has two gears of 500V / 1000V, and the variable frequency power supply is a square wave power supply. An LC filter device is provided at the output end of the electric frequency power supply.

[0044] A load temperature rise test module 7, which tests the transformer under different loads and obtains the temperature of the transformer through a thermocouple;

[0045] A computer operation port 9, which can be connected to a computer for communication, and the port is electrically connected to the conventional test module 4, the no-load test module 8, and the load temperature rise test module 7;

[0046] A connection port 6, which is used for electrical connection between the DC resistance test module 5, the transformation ratio measurement module 3 and the insulation test module 2, the no-load test module 8, the load temperature rise test module 7 and the transformer to be tested;

[0047] The cabinet 1 is used to accommodate the hardware components of the integrated distribution transformer comprehensive test system.

[0048] In this embodiment, the transformer to be tested can be subjected to DC resistance test, ratio measurement, insulation test, no-load test, load temperature rise test, etc., and all-round experiments on the transformer can be realized, with a high degree of integration, a small footprint, and easy mobility.

[0049] Embodiment 2:

[0050] An integrated distribution transformer comprehensive test system, such as Figure 1-Figure 8As shown, in order to solve the problem of load temperature rise test; this embodiment makes the following improvements on the basis of embodiment 1: the load temperature rise test module 7 includes a shell 10 installed on the inner wall of the cabinet 1 and a variable load mechanism 13 arranged on the inner wall of the shell 10, a load switching mechanism 12 for switching the load size of the variable load mechanism 13, and a speed regulating mechanism 11 arranged on the outer wall of the shell 10 and controlling the speed of the load switching mechanism 12.

[0051] When in use, the transformer to be tested can be powered, and then the load can be applied through the variable load mechanism 13. At the same time, the output current of the transformer can be detected and the temperature of the transformer can be tested using a thermocouple. The load of the variable load mechanism 13 can be driven and changed through the load switching mechanism 12, thereby realizing temperature rise tests under different loads. At the same time, the speed adjustment mechanism 11 can control the load switching speed of the variable load mechanism 13 by the load switching mechanism 12, thereby controlling the test time under different loads.

[0052] The variable load mechanism 13 includes a shell 2 38 fixed to the inner wall of the shell 10, multiple groups of multi-dimensional loads 17 fixed to the outer wall of the shell 2 38, and multiple groups of electrode switch components 16 symmetrically arranged on both sides of the inner wall of the shell 2 38. The number of the electrode switch components 16 is twice the number of the multi-dimensional loads 17, and every two groups of symmetrically arranged electrode switch components 16 cooperate with one of the multi-dimensional loads 17. The bottom of the shell 2 38 is slidably connected with a slide 14, and the inner walls on both sides of the symmetrical sides of the slide 14 are fixedly embedded with electrode sheets 15. The slide 14 is in transmission cooperation with the load switching mechanism 12.

[0053] The electrode switch assembly 16 includes a sliding electrode 18 and a fixed electrode 20, wherein the fixed electrode 20 is fixed to the inner wall of the shell 38, and the sliding electrode 18 is slidably connected to the inner wall of the sliding electrode 18. The sliding electrode 18 is connected to the shell 38 through an insulating spring 19. The outer walls of all the fixed electrodes 20 on the same side are fixed and electrically connected to the same electrode sheet 21, and the electrode sheets 21 on both sides are connected to the two ends of the multi-dimensional load 17.

[0054] The multi-dimensional load 17 is a combination of an inductive load, a capacitive load and a resistive load.

[0055] The load switching mechanism 12 can drive the slide 14 to rise and fall, thereby driving the electrode sheet 15 to rise and fall. When the electrode sheet 15 gradually rises from the lowest position, the electrode sheet 15 will first cooperate with the sliding electrode 18 at the bottom, and at the same time squeeze the sliding electrode 18 to the inner side of the shell 2 38. The sliding electrode 18 is connected to the fixed electrode 20 and the electrode sheet 2 21. At this time, the multi-dimensional load 17 at the bottom is connected to the load of the transformer to be tested. As the electrode sheet 15 gradually rises, multiple multi-dimensional loads 17 are gradually connected in parallel to the load of the transformer to be tested.

[0056] On the one hand, the device sets a plurality of multi-dimensional loads 17 and utilizes the movement of the slide 14 to control the load size connected to the transformer to be tested, thereby being able to perform temperature rise tests on the transformer under different load conditions; on the other hand, the multi-dimensional load 17 is a combination of an inductive load, a capacitive load, and a resistive load, thereby being able to match the actual load condition of the transformer and increasing the accuracy of the test.

[0057] The load switching mechanism 12 includes a turntable 22 rotatably connected to the inner wall of the shell 10 through a main shaft 25 and a motor 26 fixed to the side wall of the shell 10 by bolts. The output shaft of the motor 26 is connected to the end of the main shaft 25 through a coupling. A cam groove 24 is opened on the inner wall of the turntable 22, and a limiting column 23 is fixed on the inner wall of the slide 14. The limiting column 23 is movably limited and matched with the inner wall of the cam groove 24.

[0058] The cam groove 24 is composed of a plurality of concentric circles with different diameters that are sequentially transitionally connected.

[0059] The other end of the rotating disk 22 is buckled with a torsion spring 27 , and the other end of the torsion spring 27 is buckled with the inner wall of the housing 10 .

[0060] When the motor 26 is started, it can drive the main shaft 25 to rotate, thereby driving the turntable 22 to rotate. When the turntable 22 rotates, the cam slot 24 rotates relative to the limit column 23, so that the concentric circles of different diameters of the cam slot 24 limit the limit column 23 to drive the slide 14 to move up and down. During the test, the limit column 23 is first located at the innermost side of the cam slot 24. At this time, only one multi-dimensional load 17 is connected. As the cam slot 24 rotates, the limit column 23 moves outward step by step, so that two multi-dimensional loads 17, three multi-dimensional loads 17... are gradually connected to the load of the transformer. After the test is completed, the motor 26 is powered off, and the turntable 22 is quickly rotated and reset by the torsion of the torsion spring 27.

[0061] The device switches the load size by setting a load switching mechanism 12, so that after an on / off signal is input to the motor 26, the load can be increased step by step. When switching between multiple load levels, there is no need to control each switch, thereby simplifying the control logic. At the same time, the continuous test time under different loads can also be controlled by the speed of the motor 26.

[0062] The speed regulating mechanism 11 includes a magnetic core 29 fixed to the side wall of the shell 10 through an insulating frame, and a primary coil 28 and a secondary coil 30 respectively wound on both sides of the magnetic core 29. The primary coil 28 is connected to an AC power supply arranged in the system. The outer wall of the shell 10 is fixed with a bracket 34 by bolts. The inner wall of the bracket 34 is slidably connected with a slider 32 through a guide rod 35. The side wall of the slider 32 is fixed with an electrode head 31. The electrode head 31 contacts and electrically conducts with the outer wall of the secondary coil 30. One end of the secondary coil 30 and the electrode head 31 are respectively connected to the power supply terminals of the motor 26.

[0063] A return spring 33 is buckled on one side of the slider 32, and the other end of the return spring 33 is buckled on a side wall of the bracket 34. A permanent magnet 37 is fixed on the other side of the slider 32, and an electromagnet 36 opposite to the permanent magnet 37 is fixed on the other side wall of the bracket 34. The electromagnet 36 has the same magnetic pole as the permanent magnet 37 on the opposite side.

[0064] The electromagnet 36 is connected to the main circuit of the load circuit of the transformer to be tested.

[0065] When the primary coil 28 is powered, an induced electromotive force is generated in the secondary coil 30, thereby powering the motor 26 through one end of the secondary coil 30 and the electrode head 31. When the number of multi-dimensional loads 17 increases, the main current of the entire transformer load circuit to be tested will increase, thereby increasing the equivalent current of the electromagnet 36, increasing the magnetic field strength, increasing the repulsive force between the bracket 34 and the permanent magnet 37, and the slider 32 drives the electrode head 31 to move, thereby changing the matching position of the electrode head 31 and the secondary coil 30, and increasing the number of connected turns of the secondary coil 30, thereby increasing the driving voltage of the motor 26, increasing the speed of the motor 26, and shortening the test time.

[0066] This device, by setting up a speed adjustment mechanism 11, can reduce the test time accordingly when the load is larger, thereby preventing abnormal damage to the transformer caused by long-term high load. At the same time, by utilizing a clever "transformer" and circuit setting, the rotation speed of the motor 26 can be matched with the current size of the load circuit of the transformer to be tested, and the rotation speed of the motor 26 can be matched with the size of the load, thereby achieving the function of adaptively and automatically adjusting the test time according to the load size.

[0067] When this embodiment is used, the transformer to be tested can be powered, and then the load can be applied through the variable load mechanism 13, and the output current of the transformer can be detected and the temperature of the transformer can be tested using a thermocouple. The load of the variable load mechanism 13 can be driven and changed through the load switching mechanism 12, so as to realize the temperature rise test under different loads. At the same time, the speed adjustment mechanism 11 can control the load switching speed of the variable load mechanism 13 by the load switching mechanism 12, so as to control the test time under different loads. When the motor 26 is started, it can drive the main shaft 25 to rotate, so as to bring The movable turntable 22 rotates. When the turntable 22 rotates, the cam slot 24 rotates relative to the limit column 23, so that the concentric circles of different diameters of the cam slot 24 limit the limit column 23 to drive the slide 14 to move up and down. During the test, the limit column 23 is first located at the innermost side of the cam slot 24. At this time, only one multi-dimensional load 17 is connected. As the cam slot 24 rotates, the limit column 23 moves outward step by step, so that two multi-dimensional loads 17, three multi-dimensional loads 17... are gradually connected to the load of the transformer. After the test is completed, the motor 26 is powered off, and the turntable 22 is quickly rotated and reset by the torsion of the torsion spring 27. When the load switching mechanism 12 drives the slide 14 to rise and fall, the electrode sheet 15 is driven to rise and fall. When the electrode sheet 15 gradually rises from the lowest position, the electrode sheet 15 will first cooperate with the sliding electrode 18 at the bottom, and at the same time squeeze the sliding electrode 18 to the inner side of the shell 2 38. The sliding electrode 18 is connected to the fixed electrode 20 and the electrode sheet 21. At this time, the multi-dimensional load 17 at the bottom is connected to the load of the transformer to be tested. As the electrode sheet 15 gradually rises, multiple multi-dimensional loads 17 are gradually connected in parallel to the load of the transformer to be tested. When the primary coil 28 is powered, an induction is generated in the secondary coil 30. The electromotive force is generated, thereby powering the motor 26 through one end of the secondary coil 30 and the electrode head 31, and when the number of multi-dimensional loads 17 increases, the main current of the entire transformer load circuit to be tested will increase, thereby increasing the equivalent current of the electromagnet 36, increasing the magnetic field strength, increasing the repulsive force between the bracket 34 and the permanent magnet 37, and the slider 32 drives the electrode head 31 to move, thereby changing the matching position of the electrode head 31 and the secondary coil 30, and increasing the number of connected turns of the secondary coil 30, thereby increasing the driving voltage of the motor 26, increasing the speed of the motor 26, and shortening the test time.

[0068] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An integrated distribution transformer comprehensive test system, characterized in that: include: A conventional test module (4), comprising a DC resistance test module (5), a transformation ratio measurement module (3) and an insulation test module (2); The no-load test module (8) uses a variable frequency power supply as a power supply, the output frequency of the variable frequency power supply has two gears of 50-60Hz / 150-200Hz, the output voltage has two gears of 500V / 1000V, and the variable frequency power supply is a square wave power supply. An LC filter device is provided at the output end of the electric frequency power supply; A load temperature rise test module (7), which tests the transformer under different loads and obtains the temperature of the transformer through a thermocouple; A computer operation port (9) which can be connected to a computer for communication, and the port is electrically connected to a conventional test module (4), a no-load test module (8), and a load temperature rise test module (7); A connection port (6) is used for electrically connecting the DC resistance test module (5), the transformation ratio measurement module (3), the insulation test module (2), the no-load test module (8), the load temperature rise test module (7) and the transformer to be tested; A cabinet (1) is used to accommodate hardware components of an integrated distribution transformer comprehensive test system.

2. The integrated distribution transformer comprehensive test system according to claim 1 is characterized in that: The load temperature rise test module (7) comprises a housing (10) mounted on the inner wall of a cabinet (1), a variable load mechanism (13) arranged on the inner wall of the housing (10), a load switching mechanism (12) for switching and controlling the load size of the variable load mechanism (13), and a speed regulating mechanism (11) arranged on the outer wall of the housing (10) for controlling the speed of the load switching mechanism (12).

3. The integrated distribution transformer comprehensive test system according to claim 2 is characterized in that: The variable load mechanism (13) comprises a second shell (38) fixed to the inner wall of the first shell (10), a plurality of groups of multi-dimensional loads (17) fixed to the outer wall of the second shell (38), and a plurality of groups of electrode switch assemblies (16) symmetrically arranged on both sides of the inner wall of the second shell (38), wherein the number of the electrode switch assemblies (16) is twice the number of the multi-dimensional loads (17), and each two groups of symmetrically arranged electrode switch assemblies (16) cooperate with one of the multi-dimensional loads (17), the bottom of the second shell (38) is slidably connected with a slide frame (14), and the inner walls on both sides of the symmetrical sides of the slide frame (14) are fixedly embedded with electrode sheets (15), and the slide frame (14) is transmission-coordinated with the load switching mechanism (12).

4. The integrated distribution transformer comprehensive test system according to claim 3 is characterized in that: The electrode switch assembly (16) comprises a sliding electrode (18) and a fixed electrode (20), wherein the fixed electrode (20) is fixed to the inner wall of the second shell (38), and the sliding electrode (18) is slidably connected to the inner wall of the sliding electrode (18), and the sliding electrode (18) is connected to the second shell (38) through an insulating spring (19), and the outer walls of all the fixed electrodes (20) located on the same side are fixed and electrically connected to the same electrode sheet (21), and the electrode sheets (21) on both sides are connected to the two ends of the multi-dimensional load (17).

5. The integrated distribution transformer comprehensive test system according to claim 3 is characterized in that: The multi-dimensional load (17) is a combination of an inductive load, a capacitive load and a resistive load.

6. The integrated distribution transformer comprehensive test system according to claim 2 is characterized in that: The load switching mechanism (12) comprises a turntable (22) rotatably connected to the inner wall of a housing (10) via a main shaft (25) and a motor (26) fixed to the side wall of the housing (10) via bolts, wherein the output shaft of the motor (26) is connected to the end of the main shaft (25) via a coupling, a cam groove (24) is provided on the inner wall of the turntable (22), a limiting column (23) is fixed on the inner wall of the slide (14), and the limiting column (23) is movably limited and matched to the inner wall of the cam groove (24).

7. The integrated distribution transformer comprehensive test system according to claim 6 is characterized in that: The cam groove (24) is composed of a plurality of concentric circles with different diameters which are transitionally connected in sequence.

8. The integrated distribution transformer comprehensive test system according to claim 7 is characterized in that: The other end of the rotating disk (22) is buckled with a torsion spring (27), and the other end of the torsion spring (27) is buckled with the inner wall of the housing 1 (10).

9. The integrated distribution transformer comprehensive test system according to claim 2, characterized in that: The speed regulating mechanism (11) comprises a magnetic core (29) fixed to the side wall of the shell (10) through an insulating frame, and a primary coil (28) and a secondary coil (30) respectively wound on both sides of the magnetic core (29), the primary coil (28) being connected to an AC power supply provided in the system, a bracket (34) being fixed to the outer wall of the shell (10) through bolts, a slider (32) being slidably connected to the inner wall of the bracket (34) through a guide rod (35), an electrode head (31) being fixed to the side wall of the slider (32), the electrode head (31) being in contact with and electrically conducting with the outer wall of the secondary coil (30), one end of the secondary coil (30) and the electrode head (31) being respectively connected to the power supply terminal of the motor (26).

10. The integrated distribution transformer comprehensive test system according to claim 9, characterized in that: A return spring (33) is buckled on one side of the slider (32), and the other end of the return spring (33) is buckled on a side wall of a bracket (34). A permanent magnet (37) is fixed on the other side of the slider (32), and an electromagnet (36) opposite to the permanent magnet (37) is fixed on the other side wall of the bracket (34). The electromagnet (36) has the same magnetic pole as the permanent magnet (37) on the opposite side. The electromagnet (36) is connected to the main circuit of the load circuit of the transformer to be tested.

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