Isolation device for transformer dielectric loss test

Abstract

The invention belongs to the technical field of transformer dielectric loss test auxiliary devices, and particularly relates to an isolation device for a transformer dielectric loss test. Comprising a supporting stand column which is adjustable in height. The top plate assembly is connected to the top ends of the supporting stand columns; the multiple rotary supporting assemblies are fixedly connected to the top of the top plate assembly; the insulation isolation pipes are connected with the rotating supporting assemblies at the corresponding positions and used for conducting electromagnetic isolation protection on cable wiring penetrating through the insulation isolation pipes; the clamping and fixing assembly is connected to one end of the insulation isolation pipe and used for clamping and fixing the cable wiring penetrating through the insulation isolation pipe; on the premise of following the requirement of suspending a shielding layer in a reverse connection method, space electromagnetic interference can be effectively isolated, the high-voltage lead can be safely, conveniently and reliably fixed, different wiring angle positions are adapted, and the test efficiency and the test accuracy are improved.

Description

Technical Field

[0001] This invention belongs to the technical field of auxiliary devices for transformer dielectric loss testing, and specifically relates to an isolation device for transformer dielectric loss testing. Background Technology

[0002] Transformers are crucial core equipment in power systems, and the quality of their insulation directly affects the safe and stable operation of the entire power grid. The dielectric loss factor is a key indicator for evaluating transformer insulation performance, sensitively detecting overall insulation dampness, aging, deterioration, and severe local defects. The basic principle of dielectric loss testing is to apply a high-voltage AC current of a certain frequency and voltage to the transformer windings. By measuring the tangent of the phase difference angle between the current flowing into the insulating medium and the voltage, the energy loss of the insulating medium under the alternating electric field is reflected. Currently, frequency converter dielectric loss testers are widely used in the field for this test, with connection methods mainly including the direct connection method and the reverse connection method. For testing transformer windings along with bushings, the reverse connection method is commonly used. The standard operating procedure is as follows: short-circuit the three-phase windings on the high-voltage side of the transformer, and short-circuit and reliably ground the three-phase windings on the low-voltage side. The high-voltage output terminal of the dielectric loss tester is connected to the high-voltage side winding via a high-voltage cable. When the shielding layer of the high-voltage cable is suspended, it loses its shielding protection function, and the high-voltage core wire is completely exposed to spatial electromagnetic interference. These interference signals can couple into the test circuit, causing serious deviations in the measurement results of dielectric loss factor and capacitance, affecting the accuracy and reliability of the test data, and potentially leading to misjudgments of the equipment's insulation status. Existing dielectric loss testing methods heavily rely on personnel experience and on-site handling, lacking a dedicated device that can simultaneously provide shielding and isolation, reliable fixation, and flexible angle adjustment. This results in time-consuming and labor-intensive test preparation, and standardization and safety cannot be effectively guaranteed. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an isolation device for transformer dielectric loss testing to assist operators in conducting transformer dielectric loss tests. Under the premise of complying with the requirement of the shielding layer being suspended in the reverse connection method, it can effectively isolate spatial electromagnetic interference, and can safely, conveniently and reliably fix the high-voltage lead, adapt to different connection angle positions, and improve test efficiency and accuracy.

[0004] The objective of this invention is achieved as follows: an isolation device for testing the dielectric loss of a transformer, comprising... A support column, the height of which is adjustable; A top plate assembly, which is connected to the top of the supporting column; A rotating support assembly, wherein multiple rotating support assemblies are provided and fixedly connected to the top of the top plate assembly; Insulating isolation tubes, the number of which corresponds to the number of the rotating support assemblies, and each of which is connected to the rotating support assemblies at a corresponding position to allow for rotation in both the horizontal and vertical directions, are used to provide electromagnetic isolation protection for the cable connections passing through them; A clamping and fixing assembly is connected to one end of the insulating isolation tube and is used to clamp and fix the cable connection passing through the insulating isolation tube.

[0005] Furthermore, the top plate assembly includes a lower top plate, a supporting diagonal rod, and an upper top plate. The lower top plate is connected to the top end of the supporting column, and the supporting diagonal rod is connected between the lower top plate and the upper top plate. The rotating support assembly is disposed on the upper top plate.

[0006] Furthermore, the rotating support assembly includes a horizontal rotating support fixedly mounted on the top plate assembly, a rotating shaft rotatably connected to the horizontal rotating support, a vertical rotating support fixedly connected to the top of the rotating shaft, a rotating support plate rotatably connected to the vertical rotating support, and the top of the rotating support plate connected to the insulating isolation tube; the rotating support assembly can provide stable rotating support for the insulating isolation tube.

[0007] Furthermore, the clamping and fixing assembly includes two pressure columns arranged opposite to each other, a telescopic rod slidably connected to the middle of the pressure column, and a clamping plate connected to the end of the telescopic rod; a spring is provided inside the pressure column for pushing the corresponding telescopic rod; the surfaces of the two clamping plates opposite to each other to clamp and fix the cable connection passing through the insulating isolation tube are arc surfaces.

[0008] Furthermore, the clamping and fixing assembly also includes a sleeve frame plate connected to the end of the insulating isolation tube. The top and bottom of the sleeve frame plate are connected to bent connecting plates, which are connected to the pressure column. The internal shape and size of the sleeve frame plate are adapted to the external structure of the insulating isolation tube.

[0009] Furthermore, the insulating isolation tube consists of three layers from the inside out: an inner insulating layer, a metal shielding layer, and an outer insulating sleeve; preferably, the metal shielding layer is a copper woven shielding mesh.

[0010] Furthermore, a fixing half-ring is provided at the bottom of the insulating isolation tube at the end away from the clamping and fixing assembly. The fixing half-ring is connected to a connecting pull ring, and the bottom of the connecting pull ring is connected to an adjustment rod. The operator can adjust the orientation of the insulating isolation tube in the horizontal plane and the tilt angle in the vertical plane through the adjustment rod.

[0011] Furthermore, a connecting short rod is fixedly connected to the bottom of the connecting pull ring, a connecting sleeve is fixedly connected to the lower end of the connecting short rod, and the upper end of the adjusting pull rod is connected to the connecting sleeve.

[0012] Furthermore, a fixed base plate is connected to the bottom of the supporting column, and a tie rod connector is provided on the fixed base plate. The adjusting tie rod is an adjustable-length rod, and its lower end can be selectively connected to the tie rod connector. The length of the adjusting tie rod can be adjusted and its lower end can be connected to the tie rod connector to control and stabilize the orientation and tilt angle of the insulating isolation tube.

[0013] Furthermore, the pull rod connector includes a universal ball joint fixedly connected to the fixed base plate, and a connecting rod is fixedly connected to the ball joint of the universal ball joint. The connecting rod is used to connect to the lower end of the adjusting pull rod.

[0014] The beneficial effects of this invention are as follows: An isolation device for transformer dielectric loss testing can support components such as insulating isolation tubes via a supporting column, and the height of the supporting column can be adjusted according to on-site operational needs. The top plate assembly provides extended support and installation space for the rotating support assembly and the insulating isolation tube. The rotating support assembly allows for convenient adjustment of the orientation of the insulating isolation tube in the horizontal plane and its tilt angle in the vertical plane, accommodating various connection and extension angles of cable wiring. The insulating isolation tube provides electromagnetic isolation protection for the suspended section of the test cable wiring shield passing through it, avoiding electromagnetic interference from external space and ensuring the accuracy of the test. The clamping and fixing assembly at the end of the insulating isolation tube clamps and fixes the cable wiring passing through it, ensuring its stability. This isolation device for transformer dielectric loss testing has a reasonable structure and is easy to operate. While adhering to the requirement of suspended shielding layer in reverse connection methods, it effectively isolates spatial electromagnetic interference, safely, conveniently, and reliably fixes high-voltage leads, and adapts to different wiring angles and positions, improving test efficiency and accuracy. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of an isolation device for testing the dielectric loss of a transformer.

[0017] Figure 2This is a schematic diagram of the top plate assembly connection of an isolation device for testing the dielectric loss of a transformer.

[0018] Figure 3 This is a schematic diagram of the structure of a rotating support assembly connection for an isolation device used in transformer dielectric loss testing.

[0019] Figure 4 This is a schematic diagram of the structure of a clamping and fixing component connection for an isolation device used in transformer dielectric loss testing.

[0020] Figure 5 This is a schematic diagram of the structure of an insulating isolation tube for a transformer dielectric loss testing isolation device.

[0021] Figure 6 This is a schematic diagram of the structure of an isolation device for testing the dielectric loss of a transformer, showing the connection of an adjusting rod.

[0022] Figure 7 This is a schematic diagram of the tie rod connector of an isolation device for testing the dielectric loss of a transformer. Detailed Implementation

[0023] The present invention will now be further described with reference to the accompanying drawings.

[0024] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that in the embodiments of the present invention, all directional indications (such as up-down-left-right-forward-backward...) are only used to explain the relative positional relationship and movement between the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0027] like Figure 1 As shown, an isolation device for transformer dielectric loss testing according to the present invention includes... Support column 4, the height of which is adjustable; Top plate assembly 6, which is connected to the top of the supporting column 4; Rotary support assembly 5, wherein multiple rotary support assemblies 5 are provided and fixedly connected to the top of the top plate assembly 6; Insulating isolation tubes 2, the number of which corresponds to the number of rotating support components 5, and each of which is connected to the rotating support components 5 at a corresponding position to rotate in the horizontal and vertical directions, are used to provide electromagnetic isolation protection for the cable wiring passing through them; A clamping and fixing component 3 is connected to one end of the insulating isolation tube 2 and is used to clamp and fix the cable connection passing through the insulating isolation tube 2.

[0028] Furthermore, in one embodiment, such as Figure 2 As shown, the top plate assembly 6 includes a lower top plate 601, a supporting diagonal rod 602, and an upper top plate 603. The lower top plate 601 is connected to the top of the supporting column 4, and the supporting diagonal rod 602 connects the lower top plate 601 and the upper top plate 603. The upper top plate 603 is parallel to the lower top plate 601 and its length is longer than that of the lower top plate 601. The rotating support assembly 5 is disposed on the upper top plate 603. By setting the top plate assembly 6, a supporting installation platform can be provided for each of the rotating support assemblies 5 to provide support for the insulating isolation pipe 2.

[0029] Furthermore, in one embodiment, such as Figure 3 As shown, the rotating support assembly 5 includes a horizontal rotating support 503 fixedly mounted on the top plate assembly 6. A rotating shaft 504 is rotatably connected to the horizontal rotating support 503. A vertical rotating support 501 is fixedly connected to the top of the rotating shaft 504. A rotating support plate 502 is rotatably connected to the vertical rotating support 501. The top of the rotating support plate 502 is connected to the insulating isolation tube 2. The rotating support assembly 5 can provide stable rotating support for the insulating isolation tube 2. The rotational connection between the rotating shaft 504 and the horizontal rotating support 503 enables the horizontal rotation adjustment of the insulating isolation tube 2. The rotational connection between the rotating support plate 502 and the vertical rotating support 501 enables the vertical rotation adjustment of the insulating isolation tube 2. Through the cooperation of the above components, the orientation of the insulating isolation tube 2 in three-dimensional space can be adjusted to accommodate cable connections passing through it at various angles.

[0030] Furthermore, in one embodiment, such as Figure 4As shown, the clamping and fixing assembly 3 includes two opposing pressure columns 305. A telescopic rod 303 is slidably connected to the middle of each pressure column 305, and a clamping plate 304 is connected to the end of each telescopic rod 303. A spring is provided inside each pressure column 305 to push the corresponding telescopic rod 303. Under the push of the spring in the pressure column 305, the two clamping plates 304 are brought closer together by the corresponding telescopic rod 303, thereby squeezing and fixing the cable connection passing through it. The clamping plates 304 provide friction between themselves and the cable connection to prevent it from sliding out of the insulating isolation tube 2 without external interference. The surfaces of the two clamping plates 304 that clamp and fix the cable connection passing through the insulating isolation tube 2 are arc surfaces, so that the cable connection can pass through smoothly and avoid friction damage to the cable connection.

[0031] Furthermore, in one embodiment, such as Figure 4 As shown, the clamping and fixing assembly 3 further includes a sleeve frame plate 301 connected to the end of the insulating isolation tube 2. The top and bottom of the sleeve frame plate 301 are connected to bending plates 302, and the bending plates 302 are connected to the pressure column 305. The internal shape and size of the sleeve frame plate 301 are adapted to the external structure of the insulating isolation tube 2, so that it can be detachably connected to the end of the insulating isolation tube 2 by sleeve. The connection position at the end of the insulating isolation tube 2 can be adjusted as needed to adjust the distance between the clamping plate 304 and the end outlet of the insulating isolation tube 2, so that the cable wiring can pass through the two clamping plates 304 and be squeezed and fixed by the two clamping plates 304.

[0032] Furthermore, in one embodiment, such as Figure 5 As shown, the insulating isolation tube 2 consists of three layers from the inside out: an inner insulating layer 201, a metal shielding layer 202, and an outer insulating sleeve 203. The metal shielding layer 202 is a copper braided shielding mesh. When the cable passes through the insulating isolation tube 2, it can effectively shield electromagnetic interference in the field, ensuring the accuracy and stability of the measurement data.

[0033] Furthermore, in one embodiment, such as Figure 6 As shown, a fixing half-ring 9 is provided at the bottom of the insulating isolation tube 2 at the end away from the clamping and fixing assembly 3. The fixing half-ring 9 is connected to a connecting pull ring 10, and the bottom of the connecting pull ring 10 is connected to an adjusting pull rod 1. The operator can adjust the orientation of the insulating isolation tube 2 in the horizontal plane and the tilt angle in the vertical plane through the adjusting pull rod 1 to adapt to the cable wiring that passes through the insulating isolation tube 2 at different angles during actual operation.

[0034] Furthermore, in one embodiment, such as Figure 6 As shown, a connecting short rod 11 is fixedly connected to the bottom of the connecting pull ring 10, and a connecting sleeve 12 is fixedly connected to the lower end of the connecting short rod 11. The upper end of the adjusting pull rod 1 is connected to the connecting sleeve 12. The upper end of the adjusting pull rod 1 can be inserted into the connecting sleeve 12 and connected to it by threads, or it can be inserted into it and fixed from the side with pins or bolts. The structure is simple and reasonable, and the connection is convenient and quick. The connecting short rod 11 can be connected and installed according to the needs of the site, and it has strong adaptability.

[0035] Furthermore, in one embodiment, such as Figure 1 As shown, a fixed base plate 8 is connected to the bottom of the supporting column 4. A tie rod connector 7 is provided on the fixed base plate 8. The adjusting tie rod 1 is an adjustable-length rod, and its lower end can be selectively connected to the tie rod connector 7. After the orientation and tilt angle of the insulating isolation tube 2 are appropriately adjusted by the adjusting tie rod 1, the length of the adjusting tie rod 1 can be adjusted and its lower end can be connected to the tie rod connector 7 to control and stabilize the orientation and tilt angle of the insulating isolation tube 2 to a certain extent, so as to adapt to the situation where the orientation of each insulating isolation tube 2 cannot be stably controlled under the influence of external wind force, cable wiring length, etc. during on-site operation.

[0036] Furthermore, in one embodiment, such as Figure 7 As shown, the pull rod connector 7 includes a universal ball joint 702 fixedly connected to the fixed base plate 8. A connecting rod 701 is fixedly connected to the ball joint of the universal ball joint 702. The connecting rod 701 is used to connect to the lower end of the adjusting pull rod 1. The connecting rod 701 is inserted into the lower end of the adjusting pull rod 1 and can be directly connected by threads, or it can be inserted into the lower end of the adjusting pull rod 1 and fixed from the side with a pin or bolt. The connection is convenient and quick.

[0037] In summary, the present invention provides an isolation device for transformer dielectric loss testing. The supporting column 4 supports components such as the insulating isolation tube 2, and the height of the supporting column 4 can be adjusted according to on-site operational needs. The top plate assembly 6 provides extended support and installation space for the rotating support assembly 5 and the insulating isolation tube 2. The rotating support assembly 5 allows for convenient adjustment of the orientation of the insulating isolation tube 2 in the horizontal plane and its tilt angle in the vertical plane, accommodating various connection and extension angles of cable wiring. The insulating isolation tube 2 provides electromagnetic isolation protection for the suspended section of the test cable wiring shield passing through it, avoiding electromagnetic interference from external space and ensuring the accuracy of the test. The clamping and fixing assembly 3 at the end of the insulating isolation tube 2 clamps and fixes the cable wiring passing through it, ensuring its stability. The transformer dielectric loss testing isolation device of the present invention has a reasonable structure and is easy to operate. While adhering to the requirement of suspended shielding layer in reverse connection methods, it effectively isolates spatial electromagnetic interference, safely, conveniently, and reliably fixes high-voltage leads, and adapts to different wiring angles and positions, improving test efficiency and accuracy.

[0038] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. An isolation device for testing the dielectric loss of a transformer, characterized in that, include: Support column (4); Top plate assembly (6), the top plate assembly (6) is connected to the top of the support column (4); Rotary support assembly (5), wherein multiple rotary support assemblies (5) are provided and fixedly connected to the top of the top plate assembly (6); Insulating isolation tubes (2), the number of which corresponds to the number of the rotating support assembly (5), and are respectively connected to the rotating support assembly (5) at the corresponding positions to rotate in the horizontal and vertical directions, for electromagnetic isolation protection of the cable wiring passing through them; A clamping and fixing assembly (3) is connected to one end of the insulating isolation tube (2) and is used to clamp and fix the cable connection passing through the insulating isolation tube (2).

2. The isolation device for transformer dielectric loss testing as described in claim 1, characterized in that, The top plate assembly (6) includes a lower top plate (601), a support diagonal rod (602) and an upper top plate (603). The lower top plate (601) is connected to the top of the support column (4), and the support diagonal rod (602) is connected between the lower top plate (601) and the upper top plate (603).

3. The isolation device for transformer dielectric loss testing as described in claim 1, characterized in that, The rotating support assembly (5) includes a horizontal rotating support (503) fixedly mounted on the top plate assembly (6), a rotating shaft (504) rotatably connected to the horizontal rotating support (503), a vertical rotating support (501) fixedly connected to the top of the rotating shaft (504), a rotating support plate (502) rotatably connected to the vertical rotating support (501), and the top of the rotating support plate (502) connected to the insulating isolation tube (2).

4. The isolation device for transformer dielectric loss testing as described in claim 1, characterized in that, The clamping and fixing assembly (3) includes two pressure columns (305) arranged opposite to each other. A telescopic rod (303) is slidably connected to the middle of the pressure column (305), and a clamping plate (304) is connected to the end of the telescopic rod (303). A spring is provided inside the pressure column (305) for pushing the corresponding telescopic rod (303).

5. The isolation device for transformer dielectric loss testing as described in claim 4, characterized in that, The clamping and fixing assembly (3) also includes a sleeve frame plate (301) connected to the end of the insulating isolation tube (2). The top and bottom of the sleeve frame plate (301) are connected to bending plates (302), and the bending plates (302) are connected to the pressure column (305).

6. The isolation device for transformer dielectric loss testing as described in claim 1, characterized in that, The insulating isolation tube (2) consists of three layers from the inside out: an inner insulating layer (201), a metal shielding layer (202), and an outer insulating sleeve (203).

7. The isolation device for transformer dielectric loss testing as described in claim 1, characterized in that, A fixing half-ring (9) is provided at the bottom of the insulating isolation tube (2) away from the clamping and fixing assembly (3). The fixing half-ring (9) is connected to a connecting pull ring (10). The bottom of the connecting pull ring (10) is connected to an adjusting pull rod (1).

8. The isolation device for transformer dielectric loss testing as described in claim 7, characterized in that, The bottom of the connecting pull ring (10) is fixedly connected to a connecting short rod (11), and the lower end of the connecting short rod (11) is fixedly connected to a connecting sleeve (12). The upper end of the adjusting pull rod (1) is connected to the connecting sleeve (12).

9. The isolation device for transformer dielectric loss testing as described in claim 8, characterized in that, The bottom of the support column (4) is connected to a fixed base plate (8), and a tie rod seat (7) is provided on the fixed base plate (8). The adjusting tie rod (1) is an adjustable long rod, and its lower end can be selectively connected to the tie rod seat (7).

10. An isolation device for transformer dielectric loss testing as described in claim 9, characterized in that, The tie rod connector (7) includes a universal ball joint (702) fixedly connected to the fixed base plate (8), and a connecting rod (701) is fixedly connected to the ball joint of the universal ball joint (702).

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