Self-tightening grading ring for induced voltage withstand test of transformer

Abstract

The invention relates to the technical field of high-voltage power equipment testing, and discloses a self-tightening grading ring for a transformer induction voltage withstanding test, which comprises a cylinder part, a pressing part and a pressing part, a first frame connected to the cylinder portion, the frame having a channel; one end of the elastic piece is fixed to the end, away from the opening, of the cylinder part, and the other end of the elastic piece is connected with the abutting plate; the arm plate is arranged in the cylinder part; the at least two arm plates are oppositely arranged; edge plate bodies on the opposite sides of the at least two arm plates extend in the direction away from the opening and are bent to form clamping parts; a gap is formed between the at least two clamping parts to form a clamping opening; according to the self-tightening type grading ring for the induced voltage withstanding test of the transformer, the self-tightening type structural design is adopted, so that the grading ring can be firmly and stably installed at the head end of the sleeve; the elastic piece is used for damping, reliable contact between the grading ring and the head end of the sleeve is guaranteed, and the hard force effect of the contact surface is reduced; the installation process is simple, wires are not needed, and the operation safety coefficient is improved.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage electric power equipment testing, and in particular to a self-tightening grading ring for transformer induction withstand voltage test. Background Art

[0002] In the power system, the transformer is a key equipment for electric energy transmission and distribution. Its operating reliability and safety are directly related to the stable operation of the entire power grid. In order to ensure that the transformer can withstand the predetermined voltage without breakdown or damage during the design, manufacturing and operation process, strict voltage withstand tests must be carried out.

[0003] Induction voltage withstand test is one of the important test methods. It applies high frequency and high voltage on one side of the transformer and uses the principle of electromagnetic induction to generate corresponding voltage on the other side to test the insulation performance of the transformer.

[0004] However, during the induction withstand voltage test of ultra-high voltage (such as 750kV and above) transformers, since the voltage at the high-voltage head end of the ultra-high voltage transformer is relatively high, it is necessary to install a voltage equalizing device at the head end of the high-voltage bushing during a long-term induction withstand voltage test to reduce the impact of corona interference on the partial discharge measurement results.

[0005] At present, in the induction withstand voltage test of UHV transformers, the voltage equalizing device often uses a voltage equalizing ring. When the voltage equalizing ring is buckled to the transformer bushing, the voltage equalizing ring is lifted by a crane, and the installer rides on an aerial vehicle to manually install the voltage equalizing ring on the first end of the bushing, and at the same time fixes the voltage equalizing ring to the first end of the bushing with a wire.

[0006] During the above installation process, the operator needs to drill the wire into the equalizing ring while working at height to connect the equalizing ring to the head end of the casing. However, the internal space of the equalizing ring is limited, the installation is difficult, and there are safety risks. The performance of the tightening connection will also be affected by the operator's personal experience, resulting in low reliability and affecting detection. Summary of the invention

[0007] In view of this, the present invention provides a self-tightening grading ring for transformer induction withstand voltage test to solve the problems of difficulty in installing the grading ring and the transformer bushing and low reliability of the fastening connection.

[0008] The present invention provides a self-tightening equalizing ring for an inductive withstand voltage test of a transformer, comprising: a barrel, one end of which is provided with an opening; a first frame, connected to a side of the barrel close to the opening, the frame having a channel, the channel corresponding to the opening; an elastic member, arranged inside the barrel, one end of the elastic member being fixed to an end of the barrel away from the opening, and the other end being connected to a butt plate; an arm plate, arranged inside the barrel and located on a side of the butt plate close to the opening; at least two of the arm plates are arranged opposite to each other; the edge plates on the opposite sides of at least two arm plates respectively extend and bend in a direction away from the opening to form a clamping portion; a gap is provided between at least two clamping portions to form a clamping opening; wherein the gap of the clamping opening is smaller than the diameter of the conductive rod at the head end of the transformer bushing or the thickness of the terminal block at the head end of the bushing.

[0009] In an optional embodiment, the clamping portion is an arc-shaped plate, and the arc-shaped protruding sides of at least two of the clamping portions are arranged opposite to each other.

[0010] In an optional embodiment, the clamping opening is formed between the arc-shaped protruding sides of at least two clamping parts; wherein the gap between the vertices of the arc-shaped protruding sides of at least two clamping parts is a, and the diameter of the conductive rod at the first end of the transformer bushing or the thickness of the terminal block at the first end of the bushing is D, wherein 2 / 3D<a<D.

[0011] In an optional embodiment, the arm plate is an elastic metal plate.

[0012] In an optional embodiment, the arm plate and the abutment plate are spaced apart from each other.

[0013] In an optional embodiment, it further includes a second frame connected to a side of the barrel away from the opening.

[0014] In an optional embodiment, the first frame includes a first pipe ring and a first straight pipe; one end of the first straight pipe is connected to the cylinder, and the other end is connected to the first pipe ring; the first pipe ring corresponds to the opening, and a plurality of first straight pipes are arranged at intervals along the annular direction of the first pipe ring to form a channel from the ring mouth of the first pipe ring toward the opening.

[0015] In an optional embodiment, the second frame includes a second pipe ring and a second straight pipe; one end of the second straight pipe is connected to the cylinder, and the other end is connected to the second pipe ring; the second pipe ring corresponds to the end of the cylinder, and a plurality of second straight pipes are arranged at intervals along the circumferential direction of the second pipe ring.

[0016] In an optional embodiment, at least a portion of the plate surface of the abutment plate is arranged corresponding to the clamping opening.

[0017] In an optional embodiment, the plate body of the arm plate is extended along the radial direction of the cylinder.

[0018] Beneficial effect: The self-tightening structure design enables the pressure equalizing ring to be firmly and stably installed at the head end of the casing;

[0019] Among them, by providing an arm plate made of metal material with a certain elasticity and a clamping part with an arc-shaped plate body, the sleeve can smoothly open the clamp and automatically clamp during the insertion process without the need for additional fastening devices, thereby achieving a self-tightening installation effect and simplifying the operation process. The installation is easy and there is no need to use a wire to connect the equalizing ring to the head end of the sleeve, thereby improving the stability and reliability of the installation.

[0020] Beneficial effect: The elastic part acts as a damper to ensure reliable contact between the pressure equalizing ring and the first end of the casing, reducing the hard force of the contact surface;

[0021] Among them, the setting of elastic parts such as spring damping can absorb the tiny displacement between the head end of the casing and the abutment plate, ensuring reliable and close contact between the two, while providing a buffering effect, reducing the risk of structural deformation caused by the rapid fall of the equalizing ring and the collision with the head end of the casing, and protecting the integrity of the equalizing ring and the casing.

[0022] Beneficial effect: The self-tightening structural design and the elastic member acting as a damper work together to ensure reliable contact between the first end of the casing and the metal tube of the equalizing ring body, thereby ensuring accurate test results.

[0023] Beneficial effect: The installation process of the voltage equalizing ring is simple, no wire is required, and the operating safety factor is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of a self-tightening grading ring for transformer induction withstand voltage test according to the present invention;

[0026] Figure 2 It is a side view of the self-tightening grading ring for transformer induction withstand voltage test of the present invention;

[0027] Figure 3 The figure is a top view of the self-tightening grading ring for transformer induction withstand voltage test according to the present invention.

[0028] Description of reference numerals:

[0029] 1. Cylinder; 11. Opening; 2. First frame; 21. First tube ring; 22. First straight tube; 23. Passage; 3. Elastic member; 31. Abutment plate; 4. Arm plate; 41. Clamping portion; 42. Clamping opening; 5. Second frame; 51. Second tube ring; 52. Second straight tube. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0035] According to an embodiment of the present invention, a self-tightening grading ring for transformer induction withstand voltage test is provided, which can be applied to but not limited to 1000kV ultra-high voltage transformer induction withstand voltage test project. The self-tightening grading ring for transformer induction withstand voltage test includes:

[0036] The barrel 1 has an opening 11 at one end, and the shape of the barrel 1 can be but is not limited to a cylindrical shape; the first frame 2 is connected to a side of the barrel 1 close to the opening 11, and the frame has a channel 23, and the channel 23 corresponds to the opening 11.

[0037] The elastic member 3 is arranged inside the barrel 1, one end of the elastic member 3 is fixed to the end of the barrel 1 away from the opening 11, and the other end is connected to the abutment plate 31; the elastic member 3 can be but not limited to a spring damper, on the one hand, it is used to absorb the small displacement between the sleeve and the abutment plate 31 to ensure reliable and close contact between the two, and on the other hand, it is used to reduce the hard force at the contact surface.

[0038] The arm plate 4 is arranged inside the barrel 1 and is located on the side of the abutment plate 31 close to the opening 11; at least two of the arm plates 4 are arranged opposite to each other, and one side of the arm plate 4 is welded and fixed to the inner wall of the barrel 1; the edge plates on the opposite sides of at least two arm plates 4 extend and bend in the direction away from the opening 11 to form a clamping portion 41; there is a gap between at least two clamping portions 41 to form a clamping opening 42; wherein the gap of the clamping opening 42 is smaller than the diameter of the conductive rod at the head end of the transformer bushing or the thickness of the terminal block at the head end of the bushing.

[0039] Furthermore, the arm plate 4 is an elastic metal plate, specifically an aluminum plate. Aluminum has a moderate elastic modulus and can be temporarily deformed when the sleeve is inserted into the clamping opening 42, and can return to its original shape when the sleeve is pushed open to clamp the sleeve.

[0040] Furthermore, the clamping portion 41 is an arc-shaped plate, specifically a semicircular arc-shaped plate, to ensure that the first end of the sleeve can be easily inserted between the clamping portions 41 and that the sleeve can be subjected to uniform clamping force during the insertion process.

[0041] The opening 11 of the semicircular arc plate is arranged in the radial direction of the barrel 1; the arc-shaped raised sides of at least two of the clamping parts 41 are arranged opposite to each other; the clamping opening 42 is formed between the arc-shaped raised sides of at least two of the clamping parts 41; wherein, the gap between the vertices of the arc-shaped raised sides of at least two of the clamping parts 41 is a, the diameter of the conductive rod at the head end of the transformer bushing or the thickness of the terminal block at the head end of the bushing is D, wherein 2 / 3D<a<D, wherein, the transformer bushing extends into the barrel 1 through the channel 23 and the opening 11, and abuts against the clamping opening 42, and then with the help of the gravity effect of the equalizing ring, the head end of the bushing opens the arm plate 4 and the clamping part 41, and is inserted into the clamping opening 42, and the arm plate 4 and the clamping part 41 clamp the bushing, thereby realizing a self-tightening installation effect, which satisfies the requirement that the transformer product is firmly in contact with the terminal block at the head end of the high-voltage bushing during the induction withstand voltage test.

[0042] The installation process is that when the UHV transformer product is subjected to the induction withstand voltage test, the structure of the equalizing ring is used at the head end of the high-voltage bushing; specifically, the bushing passes through the channel 23 and the opening 11 and extends into the barrel 1, and the head end of the bushing is against the clamping opening 42. The equalizing ring uses its own weight to open the arm plate 4 and the clamping part 41, passes through the clamping opening 42, and the arm plate 4 and the clamping part 41 are clamped at the head end of the transformer bushing. Then, the head end of the bushing contacts the abutment plate 31 at the elastic member 3, and the abutment plate 31 is a metal plate. The equalizing ring slowly descends until it reaches a balanced and stable state. The elastic member 3 can ensure that the equalizing ring is in reliable contact with the head end of the bushing, and at the same time provide a buffering effect to reduce the deformation of the equalizing ring structure caused by the rapid fall of the equalizing ring and the collision with the head end of the bushing.

[0043] In this embodiment, a self-tightening structure design is adopted so that the pressure equalizing ring can be firmly and stably installed at the head end of the casing.

[0044] Among them, by providing an arm plate 4 made of a metal material with a certain elasticity and a clamping portion 41 with an arc-shaped plate body, the sleeve can smoothly open the clamping mouth 42 and automatically clamp during the insertion process. No additional fastening device is required, thereby achieving a self-tightening installation effect, simplifying the operation process, and making the installation less difficult. There is no need to use a wire to connect the equalizing ring to the head end of the sleeve, thereby improving the stability and reliability of the installation.

[0045] In this embodiment, the elastic member 3 acts as a damper to ensure reliable contact between the pressure equalizing ring and the head end of the sleeve and reduce the hard force of the contact surface.

[0046] Among them, the setting of the elastic member 3 such as spring damping can absorb the tiny displacement between the head end of the sleeve and the abutment plate 31, ensuring reliable and close contact between the two, while providing a buffering effect, reducing the risk of structural deformation caused by the rapid fall of the equalizing ring and the collision with the head end of the sleeve, and protecting the integrity of the equalizing ring and the sleeve.

[0047] Furthermore, the self-tightening structure design and the elastic member 3 acting as a damper work together to ensure reliable contact between the head end of the sleeve and the metal tube of the equalizing ring body, thereby ensuring accurate test results.

[0048] Furthermore, the installation process of the voltage equalizing ring is simple, no wires are required, and the safety factor of operation is improved.

[0049] Optionally, the barrel 1 is a cylindrical metal barrel with an inner diameter of 300 mm, an outer diameter of 320 mm, and a height of 400 mm, where the unit mm is millimeter.

[0050] Optionally, the upper portion of the barrel 1 is sealed, and the lower portion is provided with an opening 11; an elastic member 3 is welded and connected to the inner wall of the upper sealed portion of the barrel 1, and the elastic member 3 may be a spring, and the diameter of the spring is 290 mm.

[0051] Optionally, the elastic member 3 is welded to a support plate 31 , and the support plate 31 is a metal circular plate. The diameter of the metal circular plate is 290 mm and the thickness may be 5 mm.

[0052] Optionally, the arm plate 4 is spaced apart from the abutment plate 31 , and the arm plate 4 is disposed at a middle position of the barrel 1 .

[0053] Optionally, the thickness of the arm plate 4 can be 5 mm, the extension length of the arm plate 4 in the radial direction of the barrel 1 can be 140 mm, the clamping portion 41 can be a metal plate, and bent inward to form a semi-circular arc plate, and the diameter of the semi-circular arc plate can be 30 mm; the minimum gap between the two clamping portions 41, that is, the gap a between the vertices of the arc-shaped raised side of the clamping portion 41 can be 20 mm.

[0054] In some embodiments, in combination Figure 1 As shown, the first frame 2 includes a first pipe ring 21 and a first straight pipe 22; the first pipe ring 21 can be but not limited to a metal cylindrical ring, one end of the first straight pipe 22 is connected to the cylinder 1, and the other end is connected to the first pipe ring 21; the first straight pipe 22 can be but not limited to a metal pipe; the first straight pipe 22 is arranged obliquely; the first pipe ring 21 corresponds to the opening 11, and a plurality of first straight pipes 22 are evenly spaced along the annular direction of the first pipe ring 21 to form a channel 23 from the annular opening of the first pipe ring 21 toward the opening 11.

[0055] In some embodiments, in combination Figure 1 As shown, it also includes a second frame 5, which is connected to the side of the barrel 1 away from the opening 11; the second frame 5 includes a second pipe ring 51 and a second straight pipe 52; the second pipe ring 51 can be but not limited to a metal cylindrical ring; one end of the second straight pipe 52 is connected to the barrel 1, and the other end is connected to the second pipe ring 51; the second straight pipe 52 can be but not limited to a metal pipe; the second straight pipe 52 is arranged obliquely; the second pipe ring 51 corresponds to the end of the barrel 1, and a plurality of second straight pipes 52 are arranged at intervals along the circumferential direction of the second pipe ring 51.

[0056] Specifically, the first cylinder ring and the second cylinder ring are respectively installed on the cylinder portion 1 by vertically symmetrical welding of the first straight tube 22 and the second straight tube 52 .

[0057] Specifically, the metal material structure of the pressure equalizing ring is aluminum.

[0058] In some embodiments, in combination Figure 1 As shown, at least a portion of the plate surface of the abutment plate 31 is arranged corresponding to the clamping opening 42 , so that the first end of the sleeve can smoothly contact the abutment plate 31 after passing through the clamping opening 42 .

[0059] In some embodiments, in combination Figure 1 As shown, the plate body of the arm plate 4 is extended along the radial direction of the barrel portion 1 , and the tail end is fixed to the inner wall of the barrel portion 1 by welding.

[0060] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A self-tightening grading ring for transformer induction withstand voltage test, characterized in that: include: A cylindrical portion (1) having an opening (11) at one end; A first frame (2) connected to a side of the barrel (1) close to the opening (11), the frame having a channel (23), the channel (23) corresponding to the opening (11); An elastic member (3) is arranged inside the barrel (1), one end of the elastic member (3) is fixed to the end of the barrel (1) away from the opening (11), and the other end is connected to the abutment plate (31); An arm plate (4) is arranged inside the barrel (1) and is located on a side of the abutment plate (31) close to the opening (11); at least two arm plates (4) are arranged opposite to each other; The edge plates on the opposite sides of at least two arm plates (4) extend and bend in a direction away from the opening (11) to form a clamping portion (41); There is a gap between at least two clamping parts (41) to form a clamping opening (42); The gap of the clamping opening (42) is smaller than the diameter of the conductive rod at the first end of the transformer bushing or the thickness of the wiring board at the first end of the bushing.

2. The self-tightening grading ring for transformer induction withstand voltage test according to claim 1 is characterized in that: The clamping portion (41) is an arc-shaped plate, and the arc-shaped convex sides of at least two of the clamping portions (41) are arranged opposite to each other.

3. The self-tightening grading ring for transformer induction withstand voltage test according to claim 2 is characterized in that: The clamping opening (42) is formed between the arc-shaped convex sides of at least two clamping portions (41); The gap between the vertices of the arc-shaped protruding sides of at least two clamping parts (41) is a, the diameter of the conductive rod at the first end of the transformer bushing or the thickness of the bushing first end terminal block is D, wherein 2 / 3D<a<D.

4. The self-tightening grading ring for transformer induction withstand voltage test according to claim 1 is characterized in that: The arm plate (4) is a metal plate with elasticity.

5. The self-tightening grading ring for transformer induction withstand voltage test according to claim 4 is characterized in that: The arm plate (4) and the abutment plate (31) are arranged at a distance.

6. The self-tightening grading ring for transformer induction withstand voltage test according to claim 1 is characterized in that: It also includes a second frame (5) connected to a side of the barrel (1) away from the opening (11).

7. The self-tightening grading ring for transformer induction withstand voltage test according to claim 6 is characterized in that: The first frame (2) comprises a first pipe ring (21) and a first straight pipe (22); One end of the first straight tube (22) is connected to the cylinder (1), and the other end is connected to the first tube ring (21); The first pipe ring (21) corresponds to the opening (11), and a plurality of first straight pipes (22) are arranged at intervals along the annular direction of the first pipe ring (21) to form a channel (23) from the annular opening of the first pipe ring (21) toward the opening (11).

8. The self-tightening grading ring for transformer induction withstand voltage test according to claim 7 is characterized in that: The second frame (5) comprises a second pipe ring (51) and a second straight pipe (52); One end of the second straight tube (52) is connected to the cylinder (1), and the other end is connected to the second tube ring (51); The second pipe ring (51) corresponds to the end of the cylinder (1), and a plurality of second straight pipes (52) are arranged at intervals along the annular direction of the second pipe ring (51).

9. The self-tightening grading ring for transformer induction withstand voltage test according to claim 1, characterized in that: At least a portion of the plate surface of the abutment plate (31) is arranged corresponding to the clamping opening (42).

10. The self-tightening grading ring for transformer induction withstand voltage test according to claim 1, characterized in that: The plate body of the arm plate (4) is extended along the radial direction of the cylinder (1).

Images