Oil immersed transformer state quantity monitoring device

Abstract

The invention relates to the related technical field of transformer state monitoring, in particular to an oil immersed transformer state quantity monitoring device which comprises a first sensing unit, a second sensing unit, a third sensing unit, a data acquisition card and a computer. The first sensing unit, the second sensing unit and the third sensing unit are attached to the outer wall of the transformer to be monitored when monitoring the state quantity of the transformer; each of the first sensing unit, the second sensing unit and the third sensing unit is composed of a base, a vibration acceleration sensor and a temperature detection module, so that the temperature detection module detects the temperature of the outer wall of the to-be-monitored transformer. Therefore, when the vibration acceleration sensor monitors the internal condition of the to-be-monitored transformer, data detected by the vibration acceleration sensor can be compensated according to the temperature of the outer wall of the transformer, so that the measurement accuracy of the transformer state quantity monitoring device is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to transformer status monitoring, and in particular to a device for monitoring status of an oil-immersed transformer. Background Art

[0002] Oil-immersed transformers use oil as the main insulation means of the transformer and rely on oil as the cooling medium, such as oil-immersed self-cooling, oil-immersed air cooling, oil-immersed water cooling and forced oil circulation; The existing Chinese patent document with announcement number CN219641907U discloses a state quantity monitoring device for an oil-immersed transformer, which includes a mounting box, a U-shaped bottom plate, an L-shaped top plate, a mounting port, a flange, a threaded hole, a sealing ring groove, a combined monitoring mechanism, an oil guide pipeline, an auxiliary oil guide hole, a monitoring pipeline, a pressure relief port, a microprocessor, an electronic oil level gauge, an electronic oil temperature gauge, an electronic pressure relief device and an alarm. The mounting box is composed of a U-shaped bottom plate and an L-shaped top plate fixedly welded, a mounting port is arranged on the top of the mounting box, and a flange is fixedly welded on the top of the mounting port. The flange is evenly provided with a plurality of threaded holes axially, the inner side of the top surface of the flange is provided with a sealing ring groove, the sealing ring groove is padded with an elastic sealing ring, the top of the flange is fixedly connected with a combined monitoring mechanism, the bottom end of the combined monitoring mechanism is provided with an oil guide pipeline extending to the lower part of the installation box, the side wall of the oil guide pipeline is evenly provided with a plurality of auxiliary oil guide holes, the upper part of the combined monitoring mechanism is provided with a monitoring pipeline connected with the oil guide pipeline, and a microprocessor, an electronic oil level measuring meter, an electronic oil temperature measuring meter, an electronic pressure relief device and an alarm are provided in the monitoring pipeline; However, the above technical solution can only monitor the oil level, oil temperature and oil pressure inside the transformer, but cannot monitor other faults inside the transformer, which is not convenient for more accurate monitoring of internal problems of the transformer, resulting in many defects in the above solution in practical application. Therefore, the present invention proposes a state quantity monitoring device for oil-immersed transformer to solve the above problems. Summary of the invention

[0003] The object of the present invention is to provide a device for monitoring the state of an oil-immersed transformer to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a device for monitoring the state quantity of an oil-immersed transformer, comprising: A first sensing unit; A second sensing unit; A third sensing unit, wherein the first sensing unit, the second sensing unit and the third sensing unit are all arranged on the outer wall of the transformer to be monitored when monitoring the transformer state quantity; A data acquisition card, wherein the first sensor unit, the second sensor unit, and the third sensor unit are electrically connected to the data acquisition card via a primary transmission line, a secondary transmission line, and a tertiary transmission line, respectively; Computer, the data acquisition card is connected to the computer electrical signal via a four-level transmission line; The data acquisition card includes an AD acquisition module and a communication module. The AD acquisition module and the communication module are connected by electrical signals. The primary transmission line, the secondary transmission line, and the tertiary transmission line are connected to the AD acquisition module by electrical signals. The communication module is connected to the quaternary transmission line by electrical signals.

[0005] Preferably, the first sensor unit, the second sensor unit and the third sensor unit are arranged at equal intervals, and the interval value between adjacent sensor units is one third of the length of the transformer to be monitored.

[0006] Preferably, the first sensing unit, the second sensing unit and the third sensing unit all include a base, a vibration acceleration sensor and a temperature detection module, the base is provided with a primary mounting groove and a secondary mounting groove, the vibration acceleration sensor and the temperature detection module are positioned and installed in the primary mounting groove and the secondary mounting groove respectively, the primary transmission line, the secondary transmission line and the tertiary transmission line all include a primary wire body, a secondary wire body, a tertiary wire body and a quaternary wire body, the primary wire body and the secondary wire body are electrically connected to the vibration acceleration sensor signal, and the tertiary wire body and the quaternary wire body are electrically connected to the temperature detection module signal.

[0007] Preferably, the temperature detection module includes a temperature sensing module and a current conversion module, the temperature sensing module is positioned and installed in the secondary installation groove, and when the vibration acceleration sensor and the temperature sensing module are actually installed, the bottom surfaces of the vibration acceleration sensor and the temperature sensing module are flush with the bottom surface of the base, and the temperature sensing module and the current conversion module are positioned and connected through a connecting seat, and the current conversion module includes a primary conductive layer, a secondary conductive layer, a lower sealing plate, an upper sealing plate and an insulating layer, and the insulating layer is fixedly glued to the inner side of the secondary conductive layer, and a flow channel cavity is formed between the primary conductive layer and the secondary conductive layer, and the primary conductive layer and the secondary conductive layer are both iron sheets, and the tertiary wire body and the quadruple wire body are electrically connected to the primary conductive layer and the secondary conductive layer respectively, and a liquid storage cavity is opened on the temperature sensing module, and the liquid storage cavity and the flow channel cavity are connected through a connecting pipe.

[0008] Preferably, the lower end of the flow channel cavity is flush with the upper end of the liquid storage cavity, and mercury is injected into the liquid storage cavity. When the internal temperature of the liquid storage cavity is zero degrees Celsius, the mercury in the liquid storage cavity begins to overflow into the flow channel cavity, and when the internal temperature of the liquid storage cavity is one hundred degrees Celsius, the mercury in the liquid storage cavity fills the flow channel cavity.

[0009] Preferably, the primary conductive layer, the secondary conductive layer and the insulating layer are wound into a cylinder, and at this time, the cross-section of the flow channel cavity is arranged in a spiral shape, and the outer surface of the secondary conductive layer is fixedly glued with a support bar, and after the primary conductive layer, the secondary conductive layer and the insulating layer are wound, the end of the support bar is arranged to abut against the inner side surface of the primary conductive layer.

[0010] Preferably, the support bars are arranged in a plurality of equal intervals, and the spacing between adjacent support bars is twice the width of the support bars, and a U-shaped groove is provided on the side of the support bar facing the primary conductive layer, and the U-shaped grooves are arranged in a plurality of equal intervals, and the spacing between adjacent U-shaped grooves is equal to the width of the U-shaped groove.

[0011] Preferably, a magnet groove is provided at the bottom edge of the base, and a magnet ring is fixedly glued into the magnet groove.

[0012] Preferably, an annular groove is provided on the side walls of the primary mounting groove and the secondary mounting groove near the middle position, a jack groove and a threaded hole are provided on the upper side surface of the annular groove, a countersunk hole is provided at the outer end position of the threaded hole, and a positioning groove is provided on the lower side surface of the annular groove, the sizes of the vibration acceleration sensor and the temperature sensing module are consistent, and the side walls of the vibration acceleration sensor and the temperature sensing module are integrally formed with positioning ear plates, the positioning ear plates, the positioning grooves and the jack grooves are symmetrically arranged in a group, and the cross-sectional sizes of the positioning ear plates, the positioning grooves and the jack grooves are consistent, the thickness value of the positioning ear plates matches the width value of the annular groove, the outer side wall of the vibration acceleration sensor is integrally formed with a screwing handle, the outer side surface of the positioning ear plate is provided with a positioning hole, and a positioning bolt is screwed into the threaded hole, and when the positioning bolt is actually tightened, the screw of the positioning bolt is inserted into the positioning hole, and at this time, the positioning ear plate is set against the bottom of the positioning groove.

[0013] Preferably, a connecting groove is provided on the upper surface of the base, the connecting groove is connected to the countersunk hole on the same side, and the connecting groove is connected to the magnet groove through a through hole, and an air avoidance groove is provided on the outer edge of the through hole, when the positioning bolt is actually tightened, the nut of the positioning bolt is completely embedded in the countersunk hole, a connecting rod is movably inserted in the connecting groove, a magnet block and a push block are fixedly glued on the side wall at the middle position of the connecting rod, when the connecting rod is actually installed, the magnet block is inserted into the through hole and forms a contact and attraction with the magnet ring, the push block is movably arranged in the air avoidance groove, both ends of the connecting rod are integrally formed with a snap-fitting protrusion, a snap-fitting groove is provided on the side wall of the nut of the positioning bolt, the cross-section of the snap-fitting groove is U-shaped, and the circumference of the snap-fitting groove is provided with a circle, the size of the snap-fitting protrusion matches the size of the snap-fitting groove, when the positioning bolt is actually tightened and the connecting rod is completely inserted into the connecting groove, the snap-fitting protrusion is embedded in the snap-fitting groove.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. An oil-immersed transformer state quantity monitoring device is provided which is composed of a first sensing unit, a second sensing unit, a third sensing unit, a data acquisition card and a computer, and the data acquisition card is configured to be composed of an AD acquisition module and a communication module, and the first sensing unit, the second sensing unit and the third sensing unit are configured to be composed of a base, a vibration acceleration sensor and a temperature detection module, so that the temperature detection module is used to detect the temperature of the outer wall of the transformer to be monitored, so that when the vibration acceleration sensor monitors the internal condition of the transformer to be monitored, the data detected by the vibration acceleration sensor can be compensated according to the temperature of the outer wall of the transformer, thereby effectively improving the measurement accuracy of the transformer state quantity monitoring device; 2. The temperature detection module is configured to be composed of a temperature sensing module and a current conversion module, and the current conversion module is configured to be composed of a primary conductive layer, a secondary conductive layer, a lower sealing plate, an upper sealing plate and an insulating layer, and a flow channel cavity is formed between the primary conductive layer and the secondary conductive layer, and mercury is filled in the liquid storage cavity on the temperature sensing module, so that different amounts of mercury liquid are filled in the flow channel cavity through temperature changes, so that the mercury liquid is connected to the primary conductive layer and the secondary conductive layer, so that the temperature change will cause a change in the contact surface, thereby causing a change in the current, thereby achieving accurate detection of the temperature according to the current value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a structural schematic diagram of a data acquisition card of the present invention; Figure 3 This is a schematic diagram of the structure of the first sensor unit of the present invention; Figure 4 for Figure 3 A schematic diagram of the structure enlargement in the middle; Figure 5 A half-section view of the base of the present invention along the connection groove; Figure 6 for Figure 5 A magnified schematic diagram of the structure at B in the middle; Figure 7 A half-section view of the base of the present invention along the mounting groove; Figure 8 This is a schematic diagram of the connecting rod structure of the present invention; Fig. 9 for Figure 8 A magnified schematic diagram of the structure at C in the middle; Fig.10 This is a schematic diagram of the positioning bolt structure of the present invention; Fig.11 It is a structural schematic diagram of the vibration acceleration sensor of the present invention; Fig.12 This is a schematic diagram of the structure of the temperature detection module of the present invention; Fig.13 A half-section view of the temperature detection module of the present invention; Fig.14 for Fig.13 A magnified schematic diagram of the structure at D in the middle; Fig.15 It is a schematic diagram of the structure of the secondary conductive layer of the present invention; Fig.16 for Fig.15 Enlarged schematic diagram of the structure at point E in the middle.

[0016] In the figure: a first sensor unit 1, a second sensor unit 2, a third sensor unit 3, a data acquisition card 4, a computer 5, a primary transmission line 6, a secondary transmission line 7, a tertiary transmission line 8, a quaternary transmission line 9, a transformer 10, an AD acquisition module 11, a communication module 12, a base 13, a primary mounting slot 16, a secondary mounting slot 17, a temperature sensing module 18, a current conversion module 19, a connecting seat 20, a primary line body 21, a secondary line body 22, a tertiary line body 23, a quaternary line body 24, a primary conductive layer 25, a secondary conductive layer Electrical layer 26, lower sealing plate 27, upper sealing plate 28, insulating layer 29, flow channel cavity 30, liquid storage cavity 31, connecting pipe 32, support bar 33, U-shaped groove 34, annular groove 35, jack groove 36, positioning groove 37, threaded hole 38, countersunk hole 39, positioning ear plate 40, screw handle 41, positioning bolt 42, positioning hole 43, engaging groove 44, magnet groove 45, magnet ring 46, connecting groove 47, through hole 48, connecting rod 49, magnet block 50, engaging protrusion 51, air avoidance groove 52, push block 53. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-16 The present invention provides the following three preferred embodiments: Embodiment 1: A device for monitoring the state quantity of an oil-immersed transformer comprises a first sensor unit 1, a second sensor unit 2, a third sensor unit 3, a data acquisition card 4 and a computer 5. The first sensor unit 1, the second sensor unit 2 and the third sensor unit 3 are all fitted on the outer wall of the transformer 10 to be monitored when monitoring the state quantity of the transformer. The first sensor unit 1, the second sensor unit 2 and the third sensor unit 3 are electrically connected to the data acquisition card 4 through a primary transmission line 6, a secondary transmission line 7 and a tertiary transmission line 8 respectively. The data acquisition card 4 is electrically connected to the computer 5 through a fourth transmission line 9. The data acquisition card 4 comprises an AD acquisition module 11 and a communication module 12. The AD acquisition module 11 and the communication module 12 are electrically connected. The primary transmission line 6, the secondary transmission line 7 and the tertiary transmission line 8 are electrically connected to the AD acquisition module 11. The communication module 12 is electrically connected to the fourth transmission line 9.

[0019] The first sensor unit 1, the second sensor unit 2, and the third sensor unit 3 are arranged at equal intervals, and the interval value between adjacent sensor units is one third of the length of the transformer 10 to be monitored. Multi-position measurement can further improve the measurement accuracy of the monitoring device.

[0020] The first sensing unit 1, the second sensing unit 2, and the third sensing unit 3 all include a base 13, a vibration acceleration sensor 14, and a temperature detection module 15. The specific model of the vibration acceleration sensor 14 is CT1005LC. The base 13 is provided with a primary installation slot 16 and a secondary installation slot 17. The vibration acceleration sensor 14 and the temperature detection module 15 are positioned and installed in the primary installation slot 16 and the secondary installation slot 17 respectively. The primary transmission line 6, the secondary transmission line 7, and the tertiary transmission line 8 all include a primary line body 21, a secondary line body 22, a tertiary line body 23, and a quaternary line body 24. The primary line body 21 and the secondary line body 22 are electrically connected to the vibration acceleration sensor 14, and the tertiary line body 23 and the quaternary line body 24 are electrically connected to the temperature detection module 15. By setting the first sensing unit 13, the vibration acceleration sensor 14 and the temperature detection module 15 are electrically connected to the temperature detection module 15. The oil-immersed transformer state quantity monitoring device is composed of a first sensing unit 1, a second sensing unit 2, a third sensing unit 3, a data acquisition card 4 and a computer 5, and the data acquisition card 4 is configured to be composed of an AD acquisition module 11 and a communication module 12, and the first sensing unit 1, the second sensing unit 2, and the third sensing unit 3 are configured to be composed of a base 13, a vibration acceleration sensor 14 and a temperature detection module 15, so that the temperature of the outer wall of the monitored transformer 10 is detected by the temperature detection module 15, so that when the vibration acceleration sensor 14 monitors the internal situation of the monitored transformer 10, the data detected by the vibration acceleration sensor 14 can be compensated according to the temperature of the outer wall of the transformer 10, thereby effectively improving the measurement accuracy of the transformer state quantity monitoring device.

[0021] Embodiment 2: Based on Embodiment 1, the temperature detection module 15 includes a temperature sensing module 18 and a current conversion module 19. The temperature sensing module 18 is positioned and installed in the secondary installation groove 17. When the vibration acceleration sensor 14 and the temperature sensing module 18 are actually installed, the bottom surfaces of the vibration acceleration sensor 14 and the temperature sensing module 18 are flush with the bottom surface of the base 13. The temperature sensing module 18 and the current conversion module 19 are positioned and connected through the connecting seat 20. The current conversion module 19 includes a primary conductive layer 25. , a secondary conductive layer 26, a lower sealing plate 27, an upper sealing plate 28 and an insulating layer 29, the insulating layer 29 is fixedly glued to the inner side of the secondary conductive layer 26, a flow channel cavity 30 is formed between the primary conductive layer 25 and the secondary conductive layer 26, the primary conductive layer 25 and the secondary conductive layer 26 are both iron sheets, and the tertiary wire body 23 and the quaternary wire body 24 are electrically connected to the primary conductive layer 25 and the secondary conductive layer 26 respectively, a liquid storage cavity 31 is opened on the temperature sensing module 18, and the liquid storage cavity 31 and the flow channel cavity 30 are connected through a connecting pipe 32.

[0022] The lower side end of the flow channel cavity 30 is flush with the upper side end of the liquid storage cavity 31, and mercury is injected into the liquid storage cavity 31. When the temperature inside the liquid storage cavity 31 is zero degrees Celsius, the mercury in the liquid storage cavity 31 begins to overflow into the flow channel cavity 30, and when the temperature inside the liquid storage cavity 31 is one hundred degrees Celsius, the mercury in the liquid storage cavity 31 fills the flow channel cavity 30. By setting the temperature detection module 15 to be composed of a temperature sensing module 18 and a current conversion module 19, and setting the current conversion module 19 to be composed of a primary conductive layer 25, a secondary conductive layer 26, a lower sealing plate 27, an upper sealing plate 28 and an insulating layer 29 are combined to form a flow channel cavity 30 between the primary conductive layer 25 and the secondary conductive layer 26, and mercury is filled in the liquid storage cavity 31 on the temperature sensing module 18, so that different amounts of mercury liquid are filled in the flow channel cavity 30 through temperature changes, so that the mercury liquid is connected to the primary conductive layer 25 and the secondary conductive layer 26, so that the temperature change will cause the change of the contact surface, thereby causing the current to change, so as to achieve accurate detection of the temperature according to the current value.

[0023] The primary conductive layer 25, the secondary conductive layer 26, and the insulating layer 29 are wound into a cylinder, and at this time, the cross-section of the flow channel cavity 30 is set in a spiral shape, and the outer surface of the secondary conductive layer 26 is fixedly glued with a support bar 33. After the primary conductive layer 25, the secondary conductive layer 26, and the insulating layer 29 are wound, the end of the support bar 33 is set against the inner side surface of the primary conductive layer 25. The setting of the support bar 33 can ensure the overall stability of the flow channel cavity 30 to avoid deformation of the flow channel cavity 30 and affect the uniformity of the volume of each position of the flow channel cavity 30.

[0024] A plurality of support bars 33 are arranged at equal intervals, and the spacing between adjacent support bars 33 is twice the width of the support bar 33, and a U-shaped groove 34 is provided on the side of the support bar 33 facing the primary conductive layer 25, and a plurality of U-shaped grooves 34 are arranged at equal intervals, and the spacing between adjacent U-shaped grooves 34 is equal to the width of the U-shaped groove 34. Through the setting of the U-shaped groove 34, the bending of the support bar 33 can be smoother, and the U-shaped groove 34 can ensure the connectivity of each position of the flow channel cavity 30.

[0025] Embodiment 3: Based on embodiment 2, a magnet groove 45 is provided at the bottom edge of the base 13 , and a magnet ring 46 is fixedly glued into the magnet groove 45 .

[0026] The side walls of the primary mounting groove 16 and the secondary mounting groove 17 are both provided with an annular groove 35 at the middle position, the upper side of the annular groove 35 is provided with a jack groove 36 and a threaded hole 38, the outer end position of the threaded hole 38 is provided with a countersunk hole 39, and the lower side of the annular groove 35 is provided with a positioning groove 37. The sizes of the vibration acceleration sensor 14 and the temperature sensing module 18 are consistent, and the side walls of the vibration acceleration sensor 14 and the temperature sensing module 18 are integrally formed with a positioning ear plate 40, and the positioning ear plate 40, the positioning groove 37, and the jack groove 36 are symmetrically arranged in a group, and the positioning ear plate 40 , the cross-sectional dimensions of the positioning groove 37 and the jack groove 36 are consistent, the thickness value of the positioning ear plate 40 matches the width value of the annular groove 35, the outer wall of the vibration acceleration sensor 14 is integrally formed with a screw handle 41, and the outer side surface of the positioning ear plate 40 is provided with a positioning hole 43, and a positioning bolt 42 is screwed into the threaded hole 38. When the positioning bolt 42 is actually tightened, the screw rod of the positioning bolt 42 is inserted into the positioning hole 43, and at this time, the positioning ear plate 40 is set against the bottom of the positioning groove 37, which is convenient for positioning and fixing the vibration acceleration sensor 14 and the temperature sensing module 18.

[0027] A connecting groove 47 is provided on the upper surface of the base 13, and the connecting groove 47 is connected to the countersunk hole 39 on the same side, and the connecting groove 47 is connected to the magnet groove 45 through the through hole 48, and an air avoidance groove 52 is provided on the outer edge of the through hole 48. When the positioning bolt 42 is actually tightened, the nut of the positioning bolt 42 is completely embedded in the countersunk hole 39, and a connecting rod 49 is movably inserted in the connecting groove 47, and a magnet block 50 and a push block 53 are fixedly glued on the side wall at the middle position of the connecting rod 49. When the connecting rod 49 is actually installed, the magnet block 50 is inserted into the through hole 48 and forms a contact and attraction with the magnet ring 46, and the push block 53 is movably arranged in the air avoidance groove 52. Both ends of the connecting rod 49 are integrally formed with a snap-fitting protrusion 51, and a snap-fitting groove 44 is provided on the side wall of the nut of the positioning bolt 42. The cross-section is U-shaped, and the circumference of the engaging groove 44 is provided with a circle. The size of the engaging protrusion 51 matches the size of the engaging groove 44. When the positioning bolt 42 is actually tightened and the connecting rod 49 is fully inserted into the connecting groove 47, the engaging protrusion 51 is embedded in the engaging groove 44. Through the adsorption effect of the magnet block 50 and the magnet ring 46, the connecting rod 49 is stably embedded in the connecting groove 47, thereby ensuring that the engaging protrusion 51 is stably embedded in the engaging groove 44, thereby effectively avoiding the loosening of the positioning bolt 42 caused by the vibration effect of the measurement process, thereby ensuring the connection stability of the vibration acceleration sensor 14 and the temperature sensing module 18, thereby ensuring the close fit effect of the vibration acceleration sensor 14, the temperature sensing module 18 and the transformer 10 to be monitored, thereby improving the measurement accuracy.

[0028] Although the above describes the illustrative specific implementation methods of the present application so that technicians in this technical field can understand the present application, the present application is not limited to the scope of the specific implementation methods. For ordinary technicians in this technical field, as long as various changes are within the spirit and scope of the present application defined and determined by the attached claims, all application creations using the concept of the present application are protected.

Claims

1. A device for monitoring the state of an oil-immersed transformer, characterized in that: include: A first sensing unit (1); A second sensing unit (2); A third sensor unit (3), wherein the first sensor unit (1), the second sensor unit (2) and the third sensor unit (3) are all arranged in close contact with the outer wall of the transformer (10) to be monitored when monitoring the transformer state quantity; A data acquisition card (4), wherein the first sensor unit (1), the second sensor unit (2), and the third sensor unit (3) are respectively connected to the data acquisition card (4) via a primary transmission line (6), a secondary transmission line (7), and a tertiary transmission line (8); A computer (5), wherein the data acquisition card (4) is electrically connected to the computer (5) via a four-level transmission line (9); The data acquisition card (4) comprises an AD acquisition module (11) and a communication module (12); the AD acquisition module (11) and the communication module (12) are connected by electrical signals; the primary transmission line (6), the secondary transmission line (7), and the tertiary transmission line (8) are connected by electrical signals to the AD acquisition module (11); and the communication module (12) is connected by electrical signals to the quaternary transmission line (9).

2. The oil-immersed transformer state quantity monitoring device according to claim 1 is characterized in that: The first sensor unit (1), the second sensor unit (2), and the third sensor unit (3) are arranged at equal intervals, and the spacing between adjacent sensor units is one third of the length of the transformer (10) to be monitored.

3. The oil-immersed transformer state quantity monitoring device according to claim 2 is characterized in that: The first sensing unit (1), the second sensing unit (2) and the third sensing unit (3) all comprise a base (13), a vibration acceleration sensor (14) and a temperature detection module (15); the base (13) is provided with a primary installation slot (16) and a secondary installation slot (17); the vibration acceleration sensor (14) and the temperature detection module (15) are respectively positioned and installed in the primary installation slot (16) and the secondary installation slot (17); the primary transmission line (6), the secondary transmission line (7) and the tertiary transmission line (8) all comprise a primary line body (21), a secondary line body (22), a tertiary line body (23) and a quaternary line body (24); the primary line body (21) and the secondary line body (22) are electrically signal connected to the vibration acceleration sensor (14); and the tertiary line body (23) and the quaternary line body (24) are electrically signal connected to the temperature detection module (15).

4. The oil-immersed transformer state quantity monitoring device according to claim 3 is characterized in that: The temperature detection module (15) comprises a temperature sensing module (18) and a current conversion module (19); the temperature sensing module (18) is positioned and installed in the secondary installation groove (17); when the vibration acceleration sensor (14) and the temperature sensing module (18) are actually installed, the bottom surfaces of the vibration acceleration sensor (14) and the temperature sensing module (18) are flush with the bottom surface of the base (13); the temperature sensing module (18) and the current conversion module (19) are positioned and connected via a connecting seat (20); the current conversion module (19) comprises a primary conductive layer (25), a secondary conductive layer (26), a lower conductive layer (27), and a lower conductive layer (28). The temperature sensing module (18) comprises a first sealing plate (27), an upper sealing plate (28) and an insulating layer (29), wherein the insulating layer (29) is fixedly glued to the inner side of the second conductive layer (26), a flow channel cavity (30) is formed between the first conductive layer (25) and the second conductive layer (26), the first conductive layer (25) and the second conductive layer (26) are both iron sheets, and the third wire body (23) and the fourth wire body (24) are electrically connected to the first conductive layer (25) and the second conductive layer (26) respectively, and a liquid storage cavity (31) is provided on the temperature sensing module (18), and the liquid storage cavity (31) and the flow channel cavity (30) are connected via a connecting pipe (32).

5. The oil-immersed transformer state quantity monitoring device according to claim 4 is characterized in that: The lower end of the flow channel cavity (30) is flush with the upper end of the liquid storage cavity (31), and mercury is injected into the liquid storage cavity (31). When the internal temperature of the liquid storage cavity (31) is zero degrees Celsius, the mercury in the liquid storage cavity (31) begins to overflow into the flow channel cavity (30), and when the internal temperature of the liquid storage cavity (31) is one hundred degrees Celsius, the mercury in the liquid storage cavity (31) fills the flow channel cavity (30).

6. The oil-immersed transformer state quantity monitoring device according to claim 5 is characterized in that: The primary conductive layer (25), the secondary conductive layer (26), and the insulating layer (29) are wound into a cylindrical shape, and at this time, the cross-section of the flow channel cavity (30) is arranged in a spiral shape, and a support bar (33) is fixedly glued to the outer surface of the secondary conductive layer (26). After the primary conductive layer (25), the secondary conductive layer (26), and the insulating layer (29) are wound, the end of the support bar (33) is arranged to abut against the inner side surface of the primary conductive layer (25).

7. The oil-immersed transformer state quantity monitoring device according to claim 6 is characterized in that: The support bars (33) are arranged in a plurality of rows at equal intervals, and the spacing between adjacent support bars (33) is twice the width of the support bars (33); a U-shaped groove (34) is provided on a side of the support bar (33) facing the primary conductive layer (25); the U-shaped grooves (34) are arranged in a plurality of rows at equal intervals, and the spacing between adjacent U-shaped grooves (34) is equal to the width of the U-shaped groove (34).

8. The oil-immersed transformer state quantity monitoring device according to claim 7 is characterized in that: A magnet groove (45) is provided at the bottom edge of the base (13), and a magnet ring (46) is fixedly glued into the magnet groove (45).

9. The oil-immersed transformer state quantity monitoring device according to claim 8, characterized in that: The side walls of the primary installation groove (16) and the secondary installation groove (17) are both provided with an annular groove (35) at the middle position, the upper side of the annular groove (35) is provided with a socket groove (36) and a threaded hole (38), the outer end position of the threaded hole (38) is provided with a countersunk hole (39), and the lower side of the annular groove (35) is provided with a positioning groove (37), the dimensions of the vibration acceleration sensor (14) and the temperature sensing module (18) are consistent, and the side walls of the vibration acceleration sensor (14) and the temperature sensing module (18) are both integrally formed with a positioning ear plate (40), and the positioning ear plate (40), the positioning groove (37), and the socket groove (36) are A group of positioning ear plates (40), positioning grooves (37) and jack grooves (36) are symmetrically arranged, and the cross-sectional dimensions of the positioning ear plates (40), the positioning grooves (37) and the jack grooves (36) are consistent. The thickness value of the positioning ear plates (40) matches the width value of the annular grooves (35). The outer wall of the vibration acceleration sensor (14) is integrally formed with a screw handle (41). The outer side surface of the positioning ear plates (40) is provided with positioning holes (43). A positioning bolt (42) is screwed into the threaded hole (38). When the positioning bolts (42) are actually tightened, the screw rod of the positioning bolts (42) is inserted into the positioning hole (43). At this time, the positioning ear plates (40) are arranged to abut against the bottom of the positioning grooves (37).

10. The oil-immersed transformer state quantity monitoring device according to claim 9, characterized in that: The upper surface of the base (13) is provided with a connecting groove (47), the connecting groove (47) is connected to the countersunk hole (39) on the same side, and the connecting groove (47) is connected to the magnet groove (45) through a through hole (48), and an air avoidance groove (52) is provided on the outer edge of the through hole (48), when the positioning bolt (42) is actually tightened, the nut of the positioning bolt (42) is completely embedded in the countersunk hole (39), a connecting rod (49) is movably inserted in the connecting groove (47), and a magnet block (50) and a push block (53) are fixedly glued to the side wall at the middle position of the connecting rod (49), and when the connecting rod (49) is actually installed, the magnet block (50) Inserted into the through hole (48) and contacting and engaging with the magnet ring (46), the push block (53) is movably arranged in the air avoidance groove (52), both ends of the connecting rod (49) are integrally formed with a snap-fitting protrusion (51), a snap-fitting groove (44) is provided on the nut side wall of the positioning bolt (42), the cross section of the snap-fitting groove (44) is U-shaped, and the snap-fitting groove (44) is provided with a circle, the size of the snap-fitting protrusion (51) matches the size of the snap-fitting groove (44), and when the positioning bolt (42) is actually tightened and the connecting rod (49) is fully inserted into the connecting groove (47), the snap-fitting protrusion (51) is embedded in the snap-fitting groove (44).

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