Lead supporting rod suitable for transformer partial discharge test

Abstract

The invention discloses a lead supporting rod suitable for a partial discharge test of a transformer, the lead supporting rod comprises a corrugated pipe fixing clamp, an insulating supporting rod and a fixing unit, the insulating supporting rod comprises an inner sleeve and an outer sleeve which are in sliding connection, the corrugated pipe fixing clamp is connected with one end of the inner sleeve through a connecting unit, and the fixing unit is connected with one end of the outer sleeve. A vertical groove is axially formed in the inner wall of the outer sleeve, a row of tooth grooves are formed in one side of the vertical groove side by side, and the tooth grooves communicate with the vertical groove; a clamping block is arranged on the inner sleeve and matched with the tooth groove. A corrugated pipe is clamped through the corrugated pipe fixing clamp, the device is fixed to a cooling fin of a transformer through the fixing unit, the insulating supporting rod serves as a support, the corrugated pipe can be firmly supported, test interference is avoided, interference caused by infirm test wiring is reduced, test data are made to be qualified, repeated troubleshooting is not needed in the test process, and work efficiency is improved; and meanwhile, the risk of insulation breakdown of a test instrument and tested equipment caused by an infirm test wiring mode is also reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electrical test tools, and in particular to a lead support rod suitable for a transformer partial discharge test. Background Art

[0002] The main transformer induced withstand voltage partial discharge test is the most important quality control test at the transformer handover site. Due to the large test capacity, high voltage and complex wiring, as well as the use of the first stage of partial discharge detection for monitoring, it is a difficult test item in electrical testing. However, it can predict latent faults inside the equipment and effectively prevent accidents from expanding. It is an important basis for whether the main transformer can be put into operation.

[0003] In the prior art, in order to ensure that the new transformer is safely and stably put into operation in the power grid, the transformer needs to be subjected to induced withstand voltage and partial discharge tests, but there are the following problems:

[0004] 1. There are many cables for the induction withstand voltage and partial discharge tests. The wiring process takes a long time and requires 5-6 people to work together. In addition, personnel need to climb high to remove and restore the leads, which poses great safety risks and low work efficiency.

[0005] 2. The test wiring has no reliable support and needs to be fixed on the insulating operating rod with a large amount of insulating tape. This wastes materials and cannot guarantee the firmness of the support. There is a risk of insulation breakdown causing damage to the test instrument and the equipment under test.

[0006] 3. Due to the loose and non-standard wiring method, there is often certain interference in the test process, resulting in unqualified test data, and repeated checks are required during the test process. Summary of the invention

[0007] The present invention is to overcome the shortcomings of the above-mentioned prior art and provide a lead support rod suitable for transformer partial discharge test. The bellows fixing clamp of the present invention clamps the bellows, the bellows fixing clamp is made of insulating material, the fixing unit fixes the device at the heat sink of the transformer, and the insulating support rod serves as a support, so as to firmly support the bellows, avoid test interference, and improve work efficiency.

[0008] The technical solution adopted by the present invention to solve its technical problem is: a lead support rod suitable for partial discharge test of transformer, including a bellows fixing clamp, an insulating support rod and a fixing unit, the insulating support rod includes an inner sleeve and an outer sleeve that are slidably connected, the bellows fixing clamp is connected to one end of the inner sleeve through a connecting unit, and the fixing unit is connected to one end of the outer sleeve.

[0009] Preferably, a vertical groove is axially provided on the inner wall of the outer sleeve, a row of tooth grooves are arranged side by side on one side of the vertical groove, and the tooth grooves are connected to the vertical groove; a clamping block is provided on the inner sleeve, and the clamping block is arranged in cooperation with the tooth grooves.

[0010] Preferably, the clamping blocks, tooth grooves and vertical grooves are provided in plurality in circumferential correspondence.

[0011] Preferably, a collar is further provided at the upper end of the outer sleeve, a row of positioning holes is axially provided on the inner sleeve, screw holes corresponding to the positioning holes are provided on the collar, and a positioning screw passing through the positioning holes and the screw holes is also provided on the collar.

[0012] Preferably, the positioning screw comprises a free section and a threaded section, the free section is located in the positioning hole, and the threaded section is connected to the screw hole.

[0013] Preferably, the bellows fixing clamp includes a V-shaped card and two oppositely arranged card plates, one end of the card plate is detachably connected to the connecting unit, and the other end is inclined inward; the V-shaped card is located between the two card plates, and the two ends of the V-shaped card are respectively connected to the two card plates.

[0014] Preferably, the V-shaped clip comprises two straight rods located on both sides and a connecting block located in the middle, wherein the connecting block is connected to the connecting unit, one end of the straight rod is rotatably connected to the connecting block, and the other end is connected to the clip plate.

[0015] Preferably, the clamping plate is provided with a plurality of fixing holes along the length direction, and the straight rod is provided with a plurality of fixing grooves along the length direction.

[0016] Preferably, a threaded rod is provided below the connecting unit, and a threaded sleeve matching with the threaded rod is provided at one end of the inner sleeve.

[0017] Preferably, a magnetic absorber or a suction cup is provided on the lower side of the fixing unit.

[0018] Compared with the prior art, the advantages and positive effects of the present invention are:

[0019] (1) The device is fixed to the heat sink of the transformer through a fixing unit, and is supported by an insulating support rod to improve the firmness of the test wiring support. The bellows fixing clamp clamps the bellows. The bellows fixing clamp is made of insulating material and can firmly support the bellows to avoid test interference and reduce interference caused by loose test wiring. The test data is qualified, and there is no need for repeated troubleshooting during the test, which improves work efficiency. At the same time, it also reduces the risk of insulation breakdown of the test instrument and the equipment under test due to loose test wiring.

[0020] (2) There is no need to use insulating tape, insulating operating rods and other items for fixing, the wiring method is simpler and more convenient, and the wiring time of the induction withstand voltage test is greatly shortened; since there is no need to use a large amount of insulating tape to tie the insulating operating rod for fixing, it also reduces the waste of unnecessary materials.

[0021] (3) The insulating support rod has a telescopic function through the inner sleeve and the outer sleeve, which can meet the wiring requirements of different heights.

[0022] (4) After the insulating support rod is extended and retracted, the block is rotated from the vertical slot to the tooth slot and locked. The positioning hole on the inner sleeve is aligned with the screw hole on the collar. The positioning screw is inserted into the positioning hole and the screw hole, so that the inner sleeve can no longer move relative to the collar, thereby fixing the inner sleeve and the outer sleeve and achieving a better fixing effect. The positioning screw adopts a free section and a threaded section that are designed separately, which facilitates the engagement of the free section with the positioning hole and the connection of the threaded section with the screw hole, making the installation and removal of the positioning screw 34 easier and faster, improving work efficiency, and facilitating maintenance, adjustment or replacement of parts when necessary, thereby reducing maintenance costs.

[0023] (5) The inner sleeve 31 and the outer sleeve 32 are tightly fixed by the positioning screw 34, which effectively prevents loosening and slipping caused by external force or long-term use, and significantly enhances the structural stability and reliability of the entire insulating support rod 3.

[0024] (6) The two clamps are fixed inwardly and tilted to form a triangle, and the V-shaped clamps are arranged opposite to each other on the inner side, which can clamp the bellows in the middle to play a clamping role, thereby enhancing the stability of the bellows in the fixing clamp and preventing it from loosening or falling off due to vibration or external force during operation;

[0025] (7) By rotating the two straight rods and fixing them to the clamping plate through the fixing holes and the fixing grooves, the opening of the V-shaped clamp can be adjusted to adapt to the corrugated pipes of different diameters, ensuring that the corrugated pipes of each size can be tightly fixed. It has high adjustability and good adaptability, and has high flexibility and adaptability, thereby improving the use effect.

[0026] (8) A threaded rod is provided at the bottom of the connection unit, and a threaded sleeve matching the threaded rod is provided at one end of the inner sleeve, which is convenient for installation and disassembly, easy to use, fast to operate and high in efficiency.

[0027] (9) A magnetic absorber or suction cup is provided on the lower side of the fixing unit to improve the firmness of the test wiring support, which can ultimately improve work efficiency, save manpower and material resources, shorten working hours, and reduce safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the bellows fixing clamp;

[0030] Figure 3 It is a front perspective cross-sectional view of an insulating support rod;

[0031] Figure 4 It is a schematic diagram of the reverse side of the insulating support rod;

[0032] Figure 5 This is a schematic diagram of the positioning screw.

[0033] Description of reference numerals:

[0034] 1- bellows fixing clamp, 11- clamping plate, 111- fixing hole, 12- V-shaped clamp, 13- straight rod, 131- fixing groove, 14- connecting block;

[0035] 2-connecting unit, 21-threaded sleeve, 22-threaded rod;

[0036] 3-insulating support rod, 31-inner sleeve, 311-block, 312-positioning hole, 32-outer sleeve, 321-vertical groove, 322-tooth groove, 33-ring, 331-screw hole, 34-positioning screw, 341-free section, 342-threaded section;

[0037] 4-Fixed unit. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0039] Example

[0040] The following is combined with Figure 1-5 The present invention is further described as follows: a lead support rod suitable for transformer partial discharge test, such as Figure 1 and 3As shown, it includes a bellows fixing clamp 1, an insulating support rod 3 and a fixing unit 4, the insulating support rod 3 includes an inner sleeve 31 and an outer sleeve 32 which are slidably connected, the bellows fixing clamp 1 is connected to one end of the inner sleeve 31 through a connecting unit 2, and the fixing unit 4 is connected to one end of the outer sleeve 32. A vertical groove 321 is axially provided on the inner wall of the outer sleeve 32, and a row of tooth grooves 322 are arranged side by side on one side of the vertical groove 321, and the tooth grooves 322 are connected to the vertical groove 321; a clamping block 311 is provided on the inner sleeve 31, and the clamping block 311 is matched with the tooth groove 322. And a plurality of clamping blocks 311, tooth grooves 322 and vertical grooves 321 are circumferentially correspondingly provided. When the insulating support rod 3 needs to be extended or retracted, the inner sleeve 31 is rotated to rotate the clamping block 311 from the tooth groove 322 to the vertical groove 321, and the inner sleeve 31 is slid to change the extension length thereof and the outer sleeve 32; when the insulating support rod 3 is completely extended or retracted, the clamping block 311 is rotated from the vertical groove 321 to the tooth groove 322 to be clamped, so that the inner sleeve 31 can no longer move relative to the outer sleeve 32, and is fixed to play a supporting role.

[0041] The device is fixed to the heat sink of the transformer by the fixing unit 4, and the insulating support rod 3 is used as support to improve the firmness of the test wiring support. The bellows fixing clamp 1 clamps the bellows. The bellows fixing clamp 1 is made of insulating material and can firmly support the bellows to avoid test interference and reduce the interference caused by loose test wiring. The test data is qualified, and repeated troubleshooting is not required during the test, which improves work efficiency. At the same time, it also reduces the risk of insulation breakdown test instruments and tested equipment due to loose test wiring.

[0042] There is no need to use insulating tape, insulating operating rods and other items for fixing. The wiring method is simpler and more convenient, which greatly shortens the wiring time of the induction withstand voltage test. Since there is no need to use a large amount of insulating tape to tie the insulating operating rod for fixing, it also reduces the waste of unnecessary materials.

[0043] The insulating support rod 3 has a telescopic function through the inner sleeve 31 and the outer sleeve 32, and can meet the wiring requirements of different heights.

[0044] like Figure 4 and 5 As shown, a collar 33 is further provided at the upper end of the outer sleeve 32, a row of positioning holes 312 is axially provided on the inner sleeve 31, a screw hole 331 corresponding to the positioning hole 312 is provided on the collar 33, and a positioning screw 34 passing through the positioning hole 312 and the screw hole 331 is further provided on the collar 33. The positioning screw 34 includes a free section 341 and a threaded section 342, the free section 341 is located in the positioning hole 312, and the threaded section 342 is connected to the screw hole 331.

[0045] When the insulating support rod 3 is completely extended and retracted, the block 311 is rotated from the vertical slot 321 to the tooth slot 322 to be stuck, the positioning hole 312 on the inner sleeve 31 is aligned with the screw hole 331 on the collar 33, and the positioning screw 34 is inserted into the positioning hole 312 and the screw hole 331, so that the inner sleeve 31 can no longer move relative to the collar 33, thereby fixing the inner sleeve 31 and the outer sleeve 32, and achieving a better fixing effect. The positioning screw 34 is designed with a free section 341 and a threaded section 342 separately, which is convenient for the free section 341 to engage with the positioning hole 312 and the threaded section 342 to connect with the screw hole 331, making the installation and removal of the positioning screw 34 easier and faster, improving work efficiency, and facilitating maintenance, adjustment or replacement of components when necessary, thereby reducing maintenance costs.

[0046] The inner sleeve 31 and the outer sleeve 32 are tightly fixed by the positioning screws 34, which effectively prevents loosening and slipping caused by external force or long-term use, and significantly enhances the structural stability and reliability of the entire insulating support rod 3.

[0047] like Figure 2 As shown, the bellows fixing clamp 1 includes a V-shaped clamp 12 and two clamping plates 11 arranged opposite to each other, one end of the clamping plate 11 is detachably connected to the connecting unit 2, and the other end is inclined inward; the V-shaped clamp 12 is located between the two clamping plates 11, and the two ends of the V-shaped clamp 12 are respectively connected to the two clamping plates 11. The V-shaped clamp 12 includes two straight rods 13 located on both sides and a connecting block 14 located in the middle, the connecting block 14 is connected to the connecting unit 2, one end of the straight rod 13 is rotatably connected to the connecting block 14, and the other end is connected to the clamping plate 11. The clamping plate 11 is provided with a plurality of fixing holes 111 along the length direction, and the straight rod 13 is provided with a plurality of fixing grooves 131 along the length direction.

[0048] The two clamping plates 11 are fixed inwardly tilted to form a triangle, and the V-shaped clamps 12 are arranged opposite to each other on the inner side thereof, so that the corrugated pipe can be clamped in the middle to play a clamping role, thereby enhancing the stability of the corrugated pipe in the corrugated pipe fixing clamp 1 and preventing it from loosening or falling off due to vibration or external force during operation; the two straight rods 13 are rotated and fixed to the clamping plates 11 through the two fixing holes 111 and the fixing grooves 131, so that the opening of the V-shaped clamp 12 can be adjusted to adapt to corrugated pipes of different diameters, ensuring that corrugated pipes of each size can be tightly fixed, with high adjustability, good adaptability, high flexibility and adaptability, and improved use effect.

[0049] When the bellows needs to be maintained or replaced, the bellows fixing clamp 1 can be quickly loosened to easily remove or replace the bellows, thereby reducing the difficulty of maintenance and downtime.

[0050] like Figure 1As shown, a threaded rod 22 is provided below the connection unit 2, and a threaded sleeve 21 matching the threaded rod 22 is provided at one end of the inner sleeve 31. It is convenient to install and disassemble, easy to use, fast to operate and high in efficiency.

[0051] like Figure 1 As shown, a magnetic absorber or a suction cup is provided on the lower side of the fixing unit 4. Improving the firmness of the test wiring support can ultimately improve work efficiency, save manpower and material resources, shorten working hours, and reduce safety hazards.

[0052] In the description of the present invention, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the purpose of describing the present invention rather than requiring the present invention to be constructed or operated in a specific position, and therefore should not be construed as limiting the present invention. The terms "connected" and "connected" in the present invention should be understood in a broad sense, for example, it can be a connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0053] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A lead support rod suitable for transformer partial discharge test, It is characterized in that The invention comprises a bellows fixing clamp (1), an insulating support rod (3) and a fixing unit (4); the insulating support rod (3) comprises an inner sleeve (31) and an outer sleeve (32) which are slidably connected; the bellows fixing clamp (1) is connected to one end of the inner sleeve (31) via a connecting unit (2); and the fixing unit (4) is connected to one end of the outer sleeve (32).

2. A lead support rod suitable for transformer partial discharge test according to claim 1, It is characterized in that A vertical groove (321) is axially provided on the inner wall of the outer sleeve (32), a row of tooth grooves (322) are arranged side by side on one side of the vertical groove (321), and the tooth grooves (322) are communicated with the vertical groove (321); a clamping block (311) is provided on the inner sleeve (31), and the clamping block (311) is arranged in cooperation with the tooth grooves (322).

3. A lead support rod suitable for transformer partial discharge test according to claim 2, It is characterized in that The clamping block (311), the tooth groove (322) and the vertical groove (321) are all provided with a plurality of them corresponding to each other in the circumferential direction.

4. A lead support rod suitable for transformer partial discharge test according to claim 2, It is characterized in that A collar (33) is also provided at the upper end of the outer sleeve (32); a row of positioning holes (312) is axially provided on the inner sleeve (31); screw holes (331) corresponding to the positioning holes (312) are provided on the collar (33); and positioning screws (34) passing through the positioning holes (312) and the screw holes (331) are also provided on the collar (33).

5. A lead support rod suitable for transformer partial discharge test according to claim 4, It is characterized in that The positioning screw (34) comprises a free section (341) and a threaded section (342); the free section (341) is located in the positioning hole (312); and the threaded section (342) is connected to the screw hole (331).

6. A lead support rod suitable for transformer partial discharge test according to claim 1, It is characterized in that The bellows fixing clamp (1) comprises a V-shaped clamp (12) and two clamping plates (11) arranged opposite to each other, one end of the clamping plate (11) being detachably connected to the connection unit (2), and the other end being arranged inwardly inclined; the V-shaped clamp (12) is located between the two clamping plates (11), and the two ends of the V-shaped clamp (12) are respectively connected to the two clamping plates (11).

7. A lead support rod suitable for transformer partial discharge test according to claim 6, It is characterized in that The V-shaped clamp (12) comprises two straight rods (13) located on both sides and a connecting block (14) located in the middle, wherein the connecting block (14) is connected to the connecting unit (2), one end of the straight rod (13) is rotatably connected to the connecting block (14), and the other end is connected to the clamping plate (11).

8. A lead support rod suitable for transformer partial discharge test according to claim 7, It is characterized in that The clamping plate (11) is provided with a plurality of fixing holes (111) along the length direction, and the straight rod (13) is provided with a plurality of fixing grooves (131) along the length direction.

9. A lead support rod suitable for transformer partial discharge test according to claim 1, It is characterized in that A threaded rod (22) is provided below the connection unit (2), and a threaded sleeve (21) matching with the threaded rod (22) is provided at one end of the inner sleeve (31).

10. A lead support rod suitable for transformer partial discharge test according to claim 1, It is characterized in that A magnetic absorber or a suction cup is provided on the lower side of the fixing unit (4).

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