Variable-frequency series resonance test device

Abstract

The utility model relates to the technical field of variable-frequency series resonance tests, and discloses a variable-frequency series resonance test device, which comprises a variable-frequency power supply, an exciting transformer, a reactor, a capacitive voltage divider and a placement box, and is characterized in that the variable-frequency power supply, the exciting transformer, the reactor and the capacitive voltage divider are all fixedly mounted in the placement box; and the variable-frequency power supply, the exciting transformer, the reactor and the capacitive voltage divider are electrically connected. According to the utility model, the operation is simple, the test can be started only by connecting the test object to the circuit during the test, wiring among the variable-frequency power supply, the exciting transformer, the reactor and the capacitive voltage divider is not needed, the time is greatly saved, and the test efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of variable frequency series resonance test, and more specifically, to a variable frequency series resonance test device. Background Art

[0002] The variable frequency series resonance test device is a withstand voltage test equipment for large-capacity and high-voltage test products. The variable frequency series resonance test device is mainly composed of a variable frequency power supply, an excitation transformer, a reactor, and a capacitive voltage divider. It is mainly used for AC withstand voltage tests of various large power transformers, power cables, steam turbines and hydro-generators and other capacitive equipment.

[0003] When conducting a withstand voltage test, the existing variable frequency series resonance test device needs to electrically connect the variable frequency power supply, excitation transformer, reactor, capacitor voltage divider, and test product, and then remove the wires after the test is completed, which is very cumbersome. Utility Model Content

[0004] The utility model provides a variable frequency series resonance test device, which solves the very cumbersome technical problem that, when performing a withstand voltage test in the related technology, a variable frequency power supply, an excitation transformer, a reactor, a capacitive voltage divider and a test product need to be electrically connected, and the wires need to be removed after the test is completed.

[0005] According to one aspect of the utility model, a variable frequency series resonance test device is provided, including a variable frequency power supply, an excitation transformer, a reactor, a capacitor voltage divider and an installation box. The variable frequency power supply, the excitation transformer, the reactor and the capacitor voltage divider are all fixedly installed in the installation box, and the variable frequency power supply, the excitation transformer, the reactor and the capacitor voltage divider are electrically connected. When the variable frequency series resonance experimental device is used, it is necessary to perform electrical connection as required, connect the output of the variable frequency power supply to the input of the excitation transformer, connect the voltage output of the excitation transformer to the input at the bottom of the reactor, connect the output at the top of the reactor to the input at the top of the capacitor voltage divider, and connect the voltage divider signal interface at the bottom of the capacitor voltage divider to the signal interface of the variable frequency power supply. The variable frequency power supply, the excitation transformer, the reactor and the capacitor voltage divider are fixedly installed in the installation box in sequence in a clockwise or counterclockwise direction to facilitate installation and wiring and avoid line entanglement.

[0006] Furthermore, an operation port is penetrated through the top of the placement box, and the operation port is located directly above the variable frequency power supply. The length of the operation port is greater than the length of the variable frequency power supply, and the width of the operation port is greater than the width of the variable frequency power supply, so that the variable frequency power supply can be regulated through the operation port to complete the voltage withstand test. A slide groove is opened on one side wall of the operation port, and a cover plate is slidably connected to the slide groove. A push plate is fixedly connected to the top of the cover plate. After the test is completed, the push plate is pushed to drive the cover plate to slide out of the slide groove until the cover plate closes the operation port to prevent dust from falling into the placement box from the operation port.

[0007] Furthermore, a wiring port is provided on the top of the placement box, and the wiring port is located directly above the capacitor voltage divider, so that the high voltage on the top of the capacitor voltage divider can be connected to the test product with a wire to complete the voltage withstand test. A slide groove 2 is provided on one side wall of the wiring port, and a cover plate 2 is slidably connected in the slide groove 2. A push plate 2 is fixedly connected to the top of the cover plate 2. After the test is completed, the push plate 2 is pushed to drive the cover plate 2 to slide out of the slide groove 2 until the cover plate 2 closes the wiring port to prevent dust from falling into the placement box from the wiring port.

[0008] Furthermore, fixed plates one fixedly connected to the bottom inner wall of the placement box are arranged around the variable frequency power supply, and four groups of fixed plates one are respectively fitted with the four sides of the variable frequency power supply, fixed plates two fixedly connected to the bottom inner wall of the placement box are arranged around the excitation transformer, and four groups of fixed plates two are respectively fitted with the four sides of the excitation transformer, a fixing sleeve is fixedly installed on the inner wall of the placement box close to the reactor, the fixing sleeve is fixedly connected with the reactor, threaded holes are opened on the inner wall of the bottom of the placement box, the position of the threaded holes corresponds to the position of the screw holes at the bottom of the capacitor voltage divider, the capacitor voltage divider is fixedly connected to the placement box by tightening screws, and the above method can effectively prevent the variable frequency power supply, excitation transformer, reactor and capacitor voltage divider from moving horizontally or even tipping over during the movement, thereby causing the internal wiring to fall off.

[0009] Furthermore, the four groups of fixing plates 1 have multiple groups of protrusions 1 on one side close to the variable frequency power supply, and the protrusions 1 are spaced apart. The side of the protrusions 1 close to the variable frequency power supply is in contact with the side of the variable frequency power supply. The four groups of fixing plates 2 have multiple groups of protrusions 2 on one side close to the excitation transformer, and the protrusions 2 are spaced apart. The side of the protrusions 2 close to the excitation transformer is in contact with the side of the excitation transformer, so as to facilitate heat dissipation of the variable frequency power supply and the excitation transformer.

[0010] Furthermore, two groups of relative fixed plates 1 are fixedly connected with rotating shaft 1 on the top, rotating plate 1 is rotatably sleeved on the top of rotating shaft 1, and the bottom surface of rotating plate 1 is flush with the top surface of variable frequency power supply; two groups of relative fixed plates 2 are fixedly connected with rotating shaft 2 on the top, rotating plate 2 is rotatably sleeved on the top of rotating shaft 2, and the bottom surface of rotating plate 2 is flush with the top surface of excitation transformer; rotating plate 1 makes the bottom surface of rotating plate 1 fit with the top surface of variable frequency power supply, which can limit the up and down movement of variable frequency power supply; rotating plate 2 makes the bottom surface of rotating plate 2 fit with the top surface of excitation transformer, which can limit the up and down movement of excitation transformer, and avoid the variable frequency power supply and excitation transformer shaking up and down during the movement of variable frequency series resonance test device, causing internal wiring to fall off.

[0011] Furthermore, the fixed sleeve includes a fixed arc plate and a rotating arc plate. The fixed arc plate is fixedly connected to the inner wall of the placement box. One end of the rotating arc plate is rotatably connected to the fixed arc plate through an axis core, and the other end of the rotating arc plate is fixedly connected to the fixed arc plate through bolts and nuts to facilitate disassembly and installation. The inner arc surfaces of the fixed arc plate and the rotating arc plate that are close to each other are both in contact with the side of the reactor.

[0012] Furthermore, a storage box is fixedly installed on the top of the placement box, and the storage box is used to store the wires to prevent the wires from being lost.

[0013] Furthermore, four sets of universal wheels are installed at the bottom of the placement box, and the four sets of universal wheels are respectively located at the four corners of the bottom of the placement box to facilitate the movement of the variable frequency series resonance test device to the test area.

[0014] Furthermore, multiple groups of sliding rods are fixedly connected to the bottom of the placement box. The positions of the sliding rods correspond to those of the universal wheels. The sliding rods are slidably connected to the mounting plates of the universal wheels. Shock-absorbing springs are sleeved on the outer rings of the sliding rods. The shock-absorbing springs are located between the placement box and the mounting plates of the universal wheels. During the movement of the variable frequency series resonance test device, the universal wheels can move up and down along the sliding rods, and the shock-absorbing springs play a shock-absorbing role to prevent the internal wiring from falling off due to excessive vibration during the movement of the device.

[0015] Furthermore, two sets of handles are fixedly mounted on the outer wall of one side of the placement box to facilitate pushing the entire device.

[0016] The beneficial effects of the utility model are:

[0017] 1. The utility model is easy to operate. During the test, you only need to connect the test product to the circuit to start the test. There is no need to connect the frequency conversion power supply, excitation transformer, reactor and capacitor voltage divider, which greatly saves time and improves the test efficiency.

[0018] 2. The utility model fixes the variable frequency power supply, excitation transformer and reactor in the placement box by setting a fixing plate 1, a fixing plate 2 and a fixing sleeve, and fixes the capacitor voltage divider in the placement box by tightening screws, which can effectively prevent the variable frequency power supply, excitation transformer, reactor and capacitor voltage divider from tipping over, causing the wiring to fall off or even break. The utility model can move the internal instruments as a whole without moving the internal instruments to the test area one by one.

[0019] 3. The utility model can play a shock-absorbing role in the movement of the device by arranging the slide bar, the universal wheel and the shock-absorbing spring, thereby preventing the internal wiring from falling off due to excessive vibration during the movement of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the first three-dimensional structure of a variable frequency series resonance test device provided by the utility model;

[0021] Figure 2 It is a partial three-dimensional structural schematic diagram of a placement box in a variable frequency series resonance test device provided by the utility model;

[0022] Figure 3It is a three-dimensional cross-sectional schematic diagram of a variable frequency series resonance test device provided by the utility model;

[0023] Figure 4 It is a partial top view schematic diagram of a placement box in a variable frequency series resonance test device provided by the utility model;

[0024] Figure 5 It is a three-dimensional structural schematic diagram of a fixed sleeve in a variable frequency series resonance test device provided by the utility model;

[0025] Figure 6 This is a second three-dimensional structural schematic diagram of a variable frequency series resonance test device provided by the utility model;

[0026] Figure 7 yes Figure 6 Schematic diagram of the structure enlarged at point A in the middle.

[0027] Description of main symbols:

[0028] 1. Frequency conversion power supply; 11. Fixed plate 1; 111. Protrusion 1; 112. Rotating shaft 1; 113. Rotating plate 1; 2. Excitation transformer; 21. Fixed plate 2; 211. Protrusion 2; 212. Rotating shaft 2; 213. Rotating plate 2; 3. Reactor; 31. Fixed sleeve; 311. Fixed arc plate; 312. Rotating arc plate; 4. Capacitive voltage divider; 41. Threaded hole; 5. Placement box; 51. Operation port; 511. Slide slot 1; 512. Cover plate 1; 513. Push plate 1; 52. Wiring port; 521. Slide slot 2; 522. Cover plate 2; 523. Push plate 2; 53. Storage box; 54. Universal wheel; 55. Slide bar; 56. Shock-absorbing spring; 57. Handle. DETAILED DESCRIPTION

[0029] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is to enable those skilled in the art to better understand and implement the subject matter described herein. The functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the present specification. Various examples may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0030] Embodiment 1:

[0031] like Figure 1-Figure 5As shown, a variable frequency series resonance test device includes a variable frequency power supply 1, an excitation transformer 2, a reactor 3, a capacitor voltage divider 4 and an installation box 5. The variable frequency power supply 1, the excitation transformer 2, the reactor 3 and the capacitor voltage divider 4 are all fixedly installed in the installation box 5, and the variable frequency power supply 1, the excitation transformer 2, the reactor 3 and the capacitor voltage divider 4 are electrically connected. When the variable frequency series resonance experimental device is used, it is necessary to perform electrical connection as required, connect the output of the variable frequency power supply 1 to the input of the excitation transformer 2, connect the voltage output of the excitation transformer 2 to the input at the bottom of the reactor 3, connect the output at the top of the reactor 3 to the input at the top of the capacitor voltage divider 4, and connect the voltage division signal interface at the bottom of the capacitor voltage divider 4 to the signal interface of the variable frequency power supply 1. The variable frequency power supply 1, the excitation transformer 2, the reactor 3 and the capacitor voltage divider 4 are fixedly installed in the installation box 5 in a clockwise or counterclockwise direction in sequence to facilitate installation and wiring and avoid line entanglement.

[0032] In this embodiment, the variable frequency power supply 1, the excitation transformer 2, the reactor 3 and the capacitive voltage divider 4 are fixedly installed in the placement box 5 in sequence in a clockwise direction.

[0033] An operation port 51 is penetrated through the top of the accommodation box 5, and the operation port 51 is located directly above the variable frequency power supply 1. The length of the operation port 51 is greater than the length of the variable frequency power supply 1, and the width of the operation port 51 is greater than the width of the variable frequency power supply 1, so that the variable frequency power supply 1 can be regulated through the operation port 51 to complete the voltage withstand test. A slide groove 511 is opened on one side wall of the operation port 51, and a cover plate 512 is slidably connected in the slide groove 511. A push plate 513 is fixedly connected to the top of the cover plate 512. After the test is completed, the push plate 513 is pushed to drive the cover plate 512 to slide out of the slide groove 511 until the cover plate 512 closes the operation port 51 to prevent dust from falling into the accommodation box 5 from the operation port 51.

[0034] In this embodiment, the slide slot 511 is provided on the side wall of the operation opening 51 close to the excitation transformer 2 , and the push plate 513 is provided on the top of the cover plate 512 away from the end of the slide slot 511 .

[0035] A wiring port 52 is provided on the top of the placement box 5, and the wiring port 52 is located directly above the capacitor voltage divider 4, so that the high voltage on the top of the capacitor voltage divider 4 can be connected to the test product by a wire to complete the withstand voltage test. A slide groove 521 is provided on one side wall of the wiring port 52, and a cover plate 522 is slidably connected in the slide groove 521. A push plate 523 is fixedly connected to the top of the cover plate 522. After the test is completed, the push plate 523 is pushed to drive the cover plate 522 to slide out of the slide groove 521 until the cover plate 522 closes the wiring port 52 to prevent dust from falling into the placement box 5 from the wiring port 52.

[0036] In this embodiment, the second slide slot 521 is provided on the side wall of the wiring port 52 close to the reactor 3 , and the second push plate 523 is provided on the top of the second cover plate 522 away from one end of the second slide slot 521 .

[0037] The variable frequency power supply 1 is provided with fixed plates 11 fixedly connected to the inner wall of the bottom of the placement box 5 all around, and four groups of fixed plates 11 are respectively fitted with the four sides of the variable frequency power supply 1, the excitation transformer 2 is provided with fixed plates 21 fixedly connected to the inner wall of the bottom of the placement box 5 all around, and four groups of fixed plates 21 are respectively fitted with the four sides of the excitation transformer 2, a fixing sleeve 31 is fixedly installed on the inner wall of the placement box 5 close to the reactor 3, and the fixing sleeve 31 is connected to the fixing sleeve 31 of the reactor 3, a threaded hole 41 is opened on the inner wall of the bottom of the placement box 5, and the position of the threaded hole 41 corresponds to the position of the screw hole at the bottom of the capacitor voltage divider 4, and the capacitor voltage divider 4 is fixedly connected to the placement box 5 by tightening screws. Through the above method, the variable frequency power supply 1, the excitation transformer 2, the reactor 3 and the capacitor voltage divider 4 can be effectively prevented from moving horizontally or even tipping over during the movement, thereby causing the internal wiring to fall off.

[0038] In this embodiment, there are six groups of threaded holes 41 , and the capacitive voltage divider 4 can be stably fixedly installed in the placement box 5 .

[0039] The four groups of fixing plates 11 have multiple groups of protrusions 111 on one side close to the variable frequency power supply 1, and the protrusions 111 are spaced apart. The protrusions 111 are close to the side of the variable frequency power supply 1 and fit with the side of the variable frequency power supply 1. The four groups of fixing plates 21 have multiple groups of protrusions 211 on one side close to the excitation transformer 2, and the protrusions 211 are spaced apart. The protrusions 211 are close to the side of the excitation transformer 2 and fit with the side of the excitation transformer 2, so as to facilitate heat dissipation of the variable frequency power supply 1 and the excitation transformer 2.

[0040] In this embodiment, a pad fixedly connected to the bottom inner wall of the placement box 5 is arranged between the four groups of fixed plates 11, and the top surface of the pad fits with the bottom surface of the variable frequency power supply 1, so that the variable frequency power supply 1 is closer to the operating port 51, so as to facilitate the regulation of the variable frequency power supply 1.

[0041] The tops of two sets of relative fixed plates 11 are fixedly connected with a rotating shaft 112, and the tops of the rotating shaft 112 are rotatably sleeved with a rotating plate 113, and the bottom surface of the rotating plate 113 is flush with the top surface of the variable frequency power supply 1. The tops of two sets of relative fixed plates 21 are fixedly connected with a rotating shaft 212, and the tops of the rotating shaft 212 are rotatably sleeved with a rotating plate 213, and the bottom surface of the rotating plate 213 is flush with the top surface of the excitation transformer 2. The rotating plate 113 is rotated to make the bottom surface of the rotating plate 113 fit with the top surface of the variable frequency power supply 1, which can limit the up and down movement of the variable frequency power supply 1. The rotating plate 213 is rotated to make the bottom surface of the rotating plate 213 fit with the top surface of the excitation transformer 2, which can limit the up and down movement of the excitation transformer 2, thereby preventing the variable frequency power supply 1 and the excitation transformer 2 from shaking up and down during the movement of the variable frequency series resonance test device, causing the internal wiring to fall off.

[0042] The fixed sleeve 31 includes a fixed arc plate 311 and a rotating arc plate 312. The fixed arc plate 311 is fixedly connected to the inner wall of the placement box 5. One end of the rotating arc plate 312 is rotatably connected to the fixed arc plate 311 through an axis core, and the other end of the rotating arc plate 312 is fixedly connected to the fixed arc plate 311 through bolts and nuts to facilitate disassembly and installation. The inner arc surfaces of the fixed arc plate 311 and the rotating arc plate 312 that are close to each other are both in contact with the side of the reactor 3.

[0043] A storage box 53 is fixedly installed on the top of the placement box 5, and the storage box 53 is used to store the wires to prevent the wires from being lost.

[0044] The present embodiment proposes a variable frequency series resonance test device, wherein the variable frequency power supply 1, the excitation transformer 2, the reactor 3 and the capacitor voltage divider 4 are all fixedly installed in the placement box 5, and the variable frequency power supply 1, the excitation transformer 2, the reactor 3 and the capacitor voltage divider 4 are all electrically connected. When performing a withstand voltage test, the variable frequency series resonance test device is moved to the test area, the push plate 1 513 is pushed to move toward the excitation transformer 2, driving the cover plate 1 512 to slide into the slide groove 1 511, thereby opening the operation port 51, and the push plate 2 523 is pushed to move toward the reactor 3, driving the cover plate 2 522 to slide into the slide groove 2 521, thereby opening the wiring. Opening 52, take out the wire from the storage box 53, use the wire to connect the high voltage on the top of the capacitor voltage divider 4 to the test piece, after the test piece is connected, adjust the variable frequency power supply 1 to perform the withstand voltage test and record the data, after the withstand voltage test is completed, turn off the variable frequency power supply 1, remove the wire connected to the test piece and put it back into the storage box 53, push the push plate 1 513 to move away from the excitation transformer 2, drive the cover plate 1 512 to slide out of the slide groove 1 511, thereby closing the operation opening 51, push the push plate 2 523 to move away from the reactor 3, drive the cover plate 2 522 to slide out of the slide groove 2 521, thereby closing the wiring opening 52 to prevent dust from falling into the device.

[0045] Embodiment 2:

[0046] like Figure 6 and Figure 7 As shown, this embodiment is a further improvement on the basis of Embodiment 1 in that four sets of universal wheels 54 are installed at the bottom of the placement box 5, and the four sets of universal wheels 54 are respectively located at the four corners of the bottom of the placement box 5 to facilitate the movement of the variable frequency series resonance test device to the test area.

[0047] A plurality of slide bars 55 are fixedly connected to the bottom of the placement box 5. The positions of the slide bars 55 correspond to those of the universal wheels 54. The slide bars 55 are slidably connected to the mounting plate of the universal wheels 54. The outer rings of the slide bars 55 are sleeved with shock-absorbing springs 56. The shock-absorbing springs 56 are located between the placement box 5 and the mounting plate of the universal wheels 54. During the movement of the variable frequency series resonance test device, the universal wheels 54 can move up and down along the slide bars 55. The shock-absorbing springs 56 play a shock-absorbing role to prevent the internal wiring from falling off due to excessive vibration during the movement of the device.

[0048] In this embodiment, there are sixteen groups of sliding rods 55 , and every four groups of sliding rods 55 correspond to one universal wheel 54 .

[0049] Two sets of handles 57 are fixedly mounted on one side of the outer wall of the placement box 5 to facilitate pushing the entire device.

[0050] In this embodiment, the two sets of handles 57 are L-shaped, so that the handles 57 can be pushed to move the entire device.

[0051] This embodiment proposes a shock-absorbing method for the variable frequency series resonance test device during movement. The handle 57 is pushed to drive the entire device to move. When the device encounters an uneven road surface during movement, the universal wheel 54 moves up and down along the slide bar 55, and the shock-absorbing spring 56 is compressed to play a shock-absorbing role, thereby reducing the vibration of the upper device to prevent the internal wiring of the device from falling off and requiring rewiring.

[0052] The embodiment of the present embodiment is described above in conjunction with the accompanying drawings, but the present embodiment is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present embodiment, ordinary technicians in this field can also make many forms without departing from the purpose of the present embodiment and the scope of protection of the claims, all of which are within the protection of the present embodiment.

Claims

1. A variable frequency series resonance test device, comprising a variable frequency power supply (1), an excitation transformer (2), a reactor (3), and a capacitive voltage divider (4), characterized in that: The invention also comprises an installation box (5), wherein the variable frequency power supply (1), the excitation transformer (2), the reactor (3) and the capacitor voltage divider (4) are all fixedly installed in the installation box (5), and the variable frequency power supply (1), the excitation transformer (2), the reactor (3) and the capacitor voltage divider (4) are electrically connected.

2. A variable frequency series resonance test device according to claim 1, characterized in that: An operation opening (51) is formed through the top of the placement box (5), the operation opening (51) is located directly above the variable frequency power supply (1), the length of the operation opening (51) is greater than the length of the variable frequency power supply (1), the width of the operation opening (51) is greater than the width of the variable frequency power supply (1), a sliding groove (511) is formed on one side wall of the operation opening (51), a cover plate (512) is slidably connected in the sliding groove (511), and a push plate (513) is fixedly connected to the top of the cover plate (512).

3. A variable frequency series resonance test device according to claim 2, characterized in that: A wiring port (52) is formed through the top of the placement box (5), the wiring port (52) is located directly above the capacitive voltage divider (4), a second slide groove (521) is formed on one side wall of the wiring port (52), a second cover plate (522) is slidably connected in the second slide groove (521), and a second push plate (523) is fixedly connected to the top of the second cover plate (522).

4. A variable frequency series resonance test device according to claim 3, characterized in that: The variable frequency power supply (1) is provided with a fixing plate (11) fixedly connected to the inner wall of the bottom of the placement box (5) on all sides, and four groups of the fixing plate (11) are respectively fitted with the four side surfaces of the variable frequency power supply (1). The excitation transformer (2) is provided with a fixing plate (21) fixedly connected to the inner wall of the bottom of the placement box (5) on all sides, and four groups of the fixing plate (21) are respectively fitted with the four side surfaces of the excitation transformer (2). A fixing sleeve (31) is fixedly installed on the inner side wall of the placement box (5) close to the reactor (3), and the fixing sleeve (31) is connected to the fixing sleeve (31) of the reactor (3). A threaded hole (41) is opened on the inner wall of the bottom of the placement box (5), and the position of the threaded hole (41) corresponds to the position of the screw hole at the bottom of the capacitor voltage divider (4). The capacitor voltage divider (4) is fixedly connected to the placement box (5) by fastening screws.

5. A variable frequency series resonance test device according to claim 4, characterized in that: The four sets of fixing plates (11) have multiple sets of protrusions (111) on one side close to the variable frequency power supply (1), the protrusions (111) are spaced apart, and the protrusions (111) on the side close to the variable frequency power supply (1) are in contact with the side of the variable frequency power supply (1); the four sets of fixing plates (21) have multiple sets of protrusions (211) on one side close to the excitation transformer (2), the protrusions (211) are spaced apart, and the protrusions (211) on the side close to the excitation transformer (2) are in contact with the side of the excitation transformer (2).

6. A variable frequency series resonance test device according to claim 5, characterized in that: The tops of two groups of relatively fixed plates (11) are fixedly connected with a rotating shaft (112), the top of the rotating shaft (112) is rotatably sleeved with a rotating plate (113), and the bottom surface of the rotating plate (113) is flush with the top surface of the variable frequency power supply (1). The tops of two groups of relatively fixed plates (21) are fixedly connected with a rotating shaft (212), the top of the rotating shaft (212) is rotatably sleeved with a rotating plate (213), and the bottom surface of the rotating plate (213) is flush with the top surface of the excitation transformer (2).

7. A variable frequency series resonance test device according to claim 6, characterized in that: The fixed sleeve (31) comprises a fixed arc plate (311) and a rotating arc plate (312); the fixed arc plate (311) is fixedly connected to the inner wall of the placement box (5); one end of the rotating arc plate (312) is rotatably connected to the fixed arc plate (311) via an axis core; the other end of the rotating arc plate (312) is fixedly connected to the fixed arc plate (311) via bolts and nuts; inner arc surfaces of the fixed arc plate (311) and the rotating arc plate (312) that are close to each other are both in contact with the side surface of the reactor (3).

8. A variable frequency series resonance test device according to claim 7, characterized in that: A storage box (53) is fixedly mounted on the top of the placement box (5), and the storage box (53) is used to store the wires.

9. The variable frequency series resonance test device according to claim 1, characterized in that: Four sets of universal wheels (54) are installed at the bottom of the placement box (5), and the four sets of universal wheels (54) are respectively located at the four corners of the bottom of the placement box (5).

10. A variable frequency series resonance test device according to claim 9, characterized in that: A plurality of groups of slide bars (55) are fixedly connected to the bottom of the placement box (5), the positions of the slide bars (55) correspond to the positions of the universal wheels (54), the slide bars (55) are slidably connected to the mounting plate of the universal wheels (54), the outer rings of the slide bars (55) are sleeved with shock absorbing springs (56), and the shock absorbing springs (56) are located between the placement box (5) and the mounting plate of the universal wheels (54).

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