Voltage-sharing device for partial discharge test of open-type transformer

Abstract

The invention relates to the technical field of partial discharge tests of transformers, in particular to a voltage-sharing device for partial discharge tests of open-type transformers, and the device comprises an adjusting seat part which is used for achieving the vertical lifting and horizontal telescoping motions; the sheath part is mounted at the telescopic end of the adjusting seat part and is used for sleeving an umbrella skirt of the transformer bushing through lifting and horizontal actions; the voltage-sharing cover is arranged at the top end of the sheath part and is used for covering the umbrella skirt of the transformer bushing to carry out a partial discharge test; according to the invention, the adjusting seat part drives the open-type sheath part and the voltage-sharing cover to cover the outside of the transformer bushing umbrella skirt, the whole operation has the advantages of simple and flexible operation, wiring personnel do not need to operate under a crane boom and a hoisting heavy object, the operation efficiency is improved, and the personal safety of operators is guaranteed; the voltage-sharing cover adopts an expandable metal film, has the advantages of light weight and convenience in operation, is matched with a wire lapping assembly to be conveniently connected with a transformer connector bar, and reduces the operation difficulty.

Description

Technical Field

[0001] The invention relates to the technical field of transformer partial discharge test, and in particular to a voltage grading device for open transformer partial discharge test. Background Art

[0002] A power transformer is a static electrical device that is used to convert a certain value of AC voltage (current) into another or several different values ​​of voltage (current) with the same frequency. After the transformer is installed, a partial discharge test must be carried out before it is handed over for production.

[0003] In the prior art, when conducting this test on an open transformer, in order to avoid the influence of the discharge electricity of the high-voltage winding end connection on the test results, a voltage-equalizing cover needs to be installed on the bushing. Depending on the voltage level, the weight of the voltage-equalizing cover is between 40 kg and 150 kg. The voltage-equalizing cover needs to be lifted by a crane and suspended near the bushing connection bank. Then, the staff is sent to the vicinity of the voltage-equalizing cover by an aerial vehicle, and the connecting wires in the voltage-equalizing cover are connected to the bushing connection bank. Then, the wiring staff and the aerial vehicle are evacuated, and the voltage-equalizing cover is put on the bushing connection bank by a crane.

[0004] During the process, the wiring personnel need to connect wires under the crane boom and the suspended pressure equalizing cover, which violates the requirements of the power safety work regulations and poses a risk to personal safety. In addition, during the process of hoisting the pressure equalizing cover, there is a risk that the hoisted heavy objects will hit the casing and damage the test equipment and the pressure equalizing cover. Summary of the invention

[0005] In view of the problems existing in the above-mentioned existing voltage equalizing device for partial discharge test of open transformer, the present invention is proposed.

[0006] Therefore, an object of the present invention is to provide a voltage grading device for partial discharge testing of an open transformer.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a voltage grading device for partial discharge test of an open transformer, comprising:

[0008] The adjustment seat part is used to realize vertical lifting and horizontal telescopic movements;

[0009] The sheath part is installed at the telescopic end of the adjustment seat part and is used to be sheathed on the outside of the transformer bushing shed through lifting and horizontal movements;

[0010] The voltage grading cover is installed at the top of the sheath part and is used to cover the transformer bushing shed for partial discharge testing.

[0011] As a preferred solution of the voltage equalizing device for partial discharge test of open-type transformers described in the present invention, the adjustment seat part includes a base, a vertical lifting rod is installed above the base, a horizontal lifting rod is installed on the vertical lifting rod, and a connecting head is fixed to the telescopic end of the horizontal lifting rod.

[0012] As a preferred embodiment of the voltage grading device for partial discharge test of open-type transformers according to the present invention, the sheath portion comprises an outer opening tube, the outer opening tube is rotatably connected to the connector via an angle adjustment assembly, an inner opening tube is arranged inside the outer opening tube, and a driving assembly for driving the inner opening tube to extend and retract in the outer opening tube is installed on the outer side of the outer opening tube.

[0013] As a preferred solution of the voltage grading device for partial discharge test of open transformer of the present invention, wherein: an enclosure component is arranged inside the outer opening tube;

[0014] The enclosure assembly comprises an arc-shaped plate arranged inside the outer opening tube and a rotating member used for driving the arc-shaped plate to rotate 180 degrees.

[0015] As a preferred solution of the voltage equalizing device for partial discharge test of open transformer described in the present invention, the rotating part includes teeth arranged at the bottom of the arc plate and a stepper motor installed on the outside of the outer opening tube, and a gear is installed at the transmission end of the stepper motor.

[0016] As a preferred solution of the voltage grading device for partial discharge test of open transformers described in the present invention, the voltage grading cover includes a cover body assembly and a bonding wire assembly arranged inside the cover body assembly.

[0017] As a preferred solution of the voltage grading device for partial discharge test of open-type transformers described in the present invention, the cover assembly includes a metal cover and a transmission member for driving the metal cover to open and close.

[0018] As a preferred solution of the voltage grading device for partial discharge test of open transformers of the present invention, the metal cover comprises a plurality of rotatably connected skeletons, and a metal film is connected between two adjacent skeletons.

[0019] As a preferred solution of the voltage equalizing device for partial discharge test of open-type transformers described in the present invention, the transmission member includes a fixed block and a mounting platform, a start and close motor is installed above the mounting platform, a movable rod is installed at the transmission end of the start and close motor, a strip groove is opened at one end of the movable rod, and a blocking column passing through the strip groove is fixed at one end of the fixed block.

[0020] As a preferred solution of the voltage equalizing device for partial discharge test of open-type transformers described in the present invention, the wire-pulling assembly includes static clamp fingers and dynamic clamp fingers, the static clamp fingers are fixed by two fixed columns, a rotating shaft is rotatably connected between the two fixed columns, and a rope puller is provided on the outside of the rotating shaft at the middle position.

[0021] Beneficial effects of the present invention: The present invention drives the open sheath part and the voltage-grading cover to cover the outside of the transformer bushing shed by the adjusting seat part, and the overall operation has the advantages of simple and flexible operation, and there is no need for wiring personnel to operate under the crane boom and hoisting heavy objects, which not only improves the operation efficiency, but also ensures the personal safety of the operator and avoids the risk of collision safety during the hoisting process;

[0022] The voltage-equalizing cover adopts an expandable metal film, which has the advantages of light weight and easy operation. It is convenient to connect with the transformer terminal block with the wiring assembly, reducing the difficulty of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0024] Figure 1 The figure is a schematic diagram of the overall structure of the voltage equalizing device for partial discharge test of an open transformer according to the present invention.

[0025] Figure 2 The diagram is a schematic structural diagram of the adjusting seat portion of the voltage grading device for partial discharge testing of an open-type transformer according to the present invention.

[0026] Figure 3 The schematic diagram of the structure of the sheath part of the voltage grading device for partial discharge test of open transformer of the present invention.

[0027] Figure 4 It is a schematic structural diagram of the enclosed components in the voltage grading device for partial discharge testing of an open-type transformer according to the present invention.

[0028] Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged structure at point A in the middle.

[0029] Figure 6 The diagram is a schematic structural diagram of a voltage grading cover in a voltage grading device for partial discharge testing of an open-type transformer according to the present invention.

[0030] Figure 7 It is a schematic structural diagram of the cover assembly in the voltage grading device for partial discharge test of an open-type transformer of the present invention.

[0031] Figure 8 The present invention is a schematic diagram of the structure of the wiring assembly in the voltage grading device for partial discharge testing of an open transformer.

[0032] Fig. 9 The present invention is a schematic diagram of the structure of the rope puller in the voltage grading device for partial discharge test of an open transformer. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0036] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0037] Example 1

[0038] Reference Figure 1-3 , a voltage grading device for partial discharge test of open transformer, comprising:

[0039] The adjustment seat part 100 is used to realize vertical lifting and horizontal telescopic movements;

[0040] The sheath part 200 is installed at the telescopic end of the adjustment seat part 100 and is used to be sheathed on the outside of the transformer bushing shed through lifting and horizontal movements;

[0041] The voltage grading cover 300 is installed at the top of the sheath part 200 and is used for covering the transformer bushing shed to perform partial discharge test.

[0042] Furthermore, the adjustment seat part 100 includes a base 101 , a vertical lifting rod 102 is installed above the base 101 , a horizontal lifting rod 103 is installed on the vertical lifting rod 102 , and a connector 104 is fixed to the telescopic end of the horizontal lifting rod 103 .

[0043] Furthermore, the sheath portion 200 includes an outer open tube 201, which is rotatably connected to the connector 104 via an angle adjustment assembly 202, and an inner open tube 203 is arranged inside the outer open tube 201, and a driving assembly 204 for driving the inner open tube 203 to extend and retract in the outer open tube 201 is installed on the outer side of the outer open tube 201.

[0044] Specifically, the angle adjustment component 202 includes a notch 202a provided at the middle position of the bottom of the outer open tube 201, a rotating rod 202b is provided on the inner side of the notch 202a, and the rotating rod 202b is driven by a servo motor 202c. A through hole is provided on the connector 104, and a mounting plate is fixed on the outer side of the notch 202a. The servo motor 202c is installed on the outer side of the connector 104. One end of the rotating rod 202b is fixed to the driving end of the servo motor 202c, and the other end is fixed on the mounting plate through the through hole. When the servo motor 202c is driven, the rotating rod 202b is driven to rotate, so that the outer open tube 201 can be driven to rotate. The rotation angle of the servo motor 202c is used to control the rotation angle of the outer open tube 201 until it is consistent with the inclination angle of the transformer bushing shed, so that the transformer bushing shed enters from the opening of the outer open tube 201.

[0045] The driving assembly 204 includes a vertical through slot 204a symmetrically opened on the outside of the outer opening tube 201 and a guide block 204b symmetrically fixed on the outside of the inner opening tube 203. A fixed head 204c is installed on the guide block 204b. The fixed head 204c is driven by an electric push rod 204d. Before the test operation, the inner opening tube 203 needs to be pushed to slide in the outer opening tube 203 by the electric push rod 204d until the guide block 204b is located at the upper end position of the vertical through slot 204a. At this time, the overall length of the outer opening tube 201 and the inner opening tube 203 is the largest. Further, by adjusting the seat The lifting and horizontal movements of the outer opening tube 201 make it located directly below the transformer bushing shed. The angle adjustment component 202 controls the angle deflection of the outer opening tube 201 to cover the outside of the transformer bushing shed. Finally, the electric push rod 204d is controlled to retract until the voltage-equalizing cover 300 covers the end of the transformer bushing shed to complete the installation. The overall operation of the structure has the advantages of simple and flexible operation. There is no need for wiring personnel to operate under the crane boom and hoisting heavy objects, which not only improves the operation efficiency, but also ensures the personal safety of the operator and avoids the risk of collision safety during the hoisting process.

[0046] Example 2

[0047] Reference Figure 4-5 , this embodiment is different from the first embodiment in that: in this embodiment, an enclosure component 205 is disposed inside the outer opening tube 201;

[0048] The enclosing assembly 205 includes an arc-shaped plate 205a disposed inside the outer opening tube 201 and a rotating member 205b for driving the arc-shaped plate 205a to rotate 180°.

[0049] Furthermore, the rotating member 205b includes teeth 205b-1 arranged at the bottom of the arc plate 205a and a stepper motor 205b-2 installed on the outside of the outer opening tube 201, and a gear 205b-3 is installed at the transmission end of the stepper motor 205b-2.

[0050] Specifically, the operation of the stepper motor 205b-2 drives the gear 205b-3 to rotate, and the gear 205b-3 meshes with the tooth 205b-1. Therefore, with the transmission of the gear 205b-3, the arc plate 205a is attached to the inner wall of the outer open tube 201 to rotate in an arc shape. The outer open tube 201 is a C-shaped structure, and its circumference is longer than the arc plate 205a. Therefore, when the arc plate 205a rotates 180°, it will not be separated from the outer open tube 201. When the arc plate 205a rotates 180°, it will be blocked at the open side of the outer open tube 201, thereby forming an annular closure, thereby clamping the base of the transformer bushing, avoiding shaking during the test, and improving the accuracy of the test;

[0051] An arc-shaped ridge 205b-4 is fixed to the rear side of the arc-shaped plate 205a, and an arc-shaped groove 205b-5 is opened on the inner side of the outer opening tube 201 at the position corresponding to the arc-shaped ridge 205b-4. The ridge 205b-4 slides in the arc-shaped groove 205b-5 to guide the arc-shaped plate 205a when it rotates.

[0052] The rest of the structure is the same as that of Example 1.

[0053] Example 3

[0054] Reference Figure 6-9 This embodiment is different from the above embodiments in that: in this embodiment, the pressure equalizing cover 300 includes a cover body assembly 301 and a wiring assembly 302 arranged inside the cover body assembly 301.

[0055] Furthermore, the cover assembly 301 includes a metal cover 301a and a transmission member 301b for driving the metal cover 301a to open and close.

[0056] The metal cover 301a includes a plurality of rotatably connected skeletons 301a-1, and a metal film 301a-2 is connected between two adjacent skeletons 301a-1.

[0057] Specifically, the frame 301a-1 is a semi-arc strip structure, and the inner diameters of several frames 301a-1 are increased in sequence. Both ends of several frames 301a-1 are rotatably connected to the inner open tube 203 through a rotating pin. The innermost frame 301a-1 is horizontally placed and fixed to the outer side of the inner open tube 203. When the outermost frame 301a-1 is pulled, it will rotate along the axis of the rotating pin, and drive other frames 301a-1 to rotate under the action of the metal film 301a-2 until the outermost frame 301a-1 rotates to a horizontal state, forming a complete metal cover 301a.

[0058] A card slot is provided on the outside of the frame 301a-1, and fixing strips are provided on both sides of the metal film 301a-2. A clamping head is provided on the inner side of the fixing strip at the position corresponding to the card slot. The clamping head is inserted into the card slot to complete the installation of the metal film 301a-2d, which can facilitate the disassembly and replacement.

[0059] Furthermore, the transmission member 301b includes a fixed block 301b-1 and a mounting platform 301b-2, an opening and closing motor 301b-3 is installed above the mounting platform 301b-2, a movable rod 301b-4 is installed at the transmission end of the opening and closing motor 301b-3, a strip groove 301b-5 is opened at one end of the movable rod 301b-4, and a blocking column 301b-6 passing through the strip groove 301b-5 is fixed at one end of the fixed block 301b-1.

[0060] Specifically, the fixed block 301b-1 is fixed to one end of the outermost frame 301a-1, and the axis of one end of the fixed block 301b-1 is concentric with the rotating pin, the blocking column 301b-6 is fixed to the end of the fixed block 301b-1 away from the rotating pin, and the mounting platform 301b-2 is fixed to the outer side of the inner opening tube 203. The opening and closing motor 301b-3 drives the movable rod 301b-4 to swing in an arc through forward and reverse operations. During the swing, the strip groove 301b-5 will push the blocking column 301b-6, thereby making the outermost frame 301a-1 make an arc movement, thereby realizing the opening and closing of the metal cover 301a, which has the advantages of light weight and easy operation.

[0061] Furthermore, the wiring assembly 302 includes a stationary clamp finger 302a and a movable clamp finger 302b. The stationary clamp finger 302a is fixed by two fixed columns 302c. A rotating shaft 302d is rotatably connected between the two fixed columns 302c. A rope puller 302e is provided at the middle section of the rotating shaft 302d.

[0062] Specifically, two fixed columns 302c are respectively fixed to the inner side of the inner opening tube 203, two rings are arranged on the upper end of the static clamp finger 302a, and the two rings are respectively fixed to the two fixed columns 302c, and the movable clamp finger 302a is fixed to the rotating shaft 302d, and the rotating shaft 302d is driven to rotate by pulling the rope puller 302e, and then the rotating shaft 302d is driven to move the movable clamp finger 302a and move close to the static clamp finger 302a, so as to clamp the transformer terminal block. This structure can be operated remotely without the need for workers to climb up to operate, which improves work efficiency and reduces operation risks;

[0063] The rope puller 302e includes a ring sleeve 302e-1, and hemispherical grooves 302e-2 are equidistantly provided on the outer circumference of the ring sleeve 302e-1. Round balls 302e-3 are arranged in the hemispherical grooves 302e-2. Several round balls 302e-3 are connected in series through a pull rope 302e-4. An outer shell 302e-5 is arranged on the outer side of the ring sleeve 302e-1. A window 302e-6 is provided on the outer circumference of the outer shell 302e-5. The outer shell 302e-5 is fixed to the ring sleeve. During operation, pulling the two ends of the pull rope 302e-4 respectively will drive the ring sleeve 302e-1 to rotate forward and reverse, and then drive the rotating shaft 302d to rotate forward and reverse, thereby realizing the movement of the movable forceps finger 302a.

[0064] The voltage-equalizing cover 300 of this structure adopts an expandable metal film 301a-2, which has the advantages of being light in weight and easy to operate. It is convenient to connect with the transformer wiring bar in combination with the wiring assembly 302, thus reducing the difficulty of operation.

[0065] The rest of the structure is the same as that of Example 2.

[0066] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0067] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0068] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A voltage grading device for partial discharge test of open transformer, characterized in that: include: The adjusting seat part (100) is used to realize vertical lifting and horizontal telescopic movements; The sheath part (200) is installed on the telescopic end of the adjustment seat part (100) and is used to be sheathed on the outside of the transformer bushing shed through lifting and horizontal movements; The voltage grading cover (300) is installed on the top of the sheath part (200) and is used for covering the transformer bushing shed to perform a partial discharge test.

2. The voltage grading device for partial discharge test of open transformer according to claim 1, characterized in that: The adjustment seat part (100) comprises a base (101), a vertical lifting rod (102) is installed above the base (101), a horizontal lifting rod (103) is installed on the vertical lifting rod (102), and a connecting head (104) is fixed at the telescopic end of the horizontal lifting rod (103).

3. The voltage grading device for partial discharge test of open transformer according to claim 2, characterized in that: The sheath portion (200) comprises an outer open tube (201), the outer open tube (201) is rotatably connected to the connector (104) via an angle adjustment assembly (202), an inner open tube (203) is arranged inside the outer open tube (201), and a driving assembly (204) for driving the inner open tube (203) to extend and retract in the outer open tube (201) is installed on the outer side of the outer open tube (201).

4. The voltage grading device for partial discharge test of open transformer according to claim 3, characterized in that: An enclosure component (205) is disposed inside the outer opening tube (201); The enclosing assembly (205) comprises an arc-shaped plate (205a) arranged inside the outer opening tube (201) and a rotating member (205b) used for driving the arc-shaped plate (205a) to rotate 180 degrees.

5. The voltage grading device for partial discharge test of open transformer according to claim 4, characterized in that: The rotating member (205b) comprises teeth (205b-1) arranged at the bottom of the arc-shaped plate (205a) and a stepping motor (205b-2) installed on the outside of the outer opening tube (201), and a gear (205b-3) is installed at the transmission end of the stepping motor (205b-2).

6. The voltage grading device for partial discharge test of open transformer according to claim 5, characterized in that: The pressure equalizing cover (300) comprises a cover body component (301) and a wiring component (302) arranged inside the cover body component (301).

7. The voltage grading device for partial discharge test of open transformer according to claim 6, characterized in that: The cover body assembly (301) comprises a metal cover (301a) and a transmission member (301b) for driving the metal cover (301a) to open and close.

8. The voltage grading device for partial discharge test of open transformer according to claim 7, characterized in that: The metal cover (301a) comprises a plurality of rotatably connected skeletons (301a-1), and a metal film (301a-2) is connected between two adjacent skeletons (301a-1).

9. The voltage grading device for partial discharge test of open transformer according to claim 8, characterized in that: The transmission member (301b) comprises a fixed block (301b-1) and a mounting platform (301b-2); an opening and closing motor (301b-3) is mounted above the mounting platform (301b-2); a movable rod (301b-4) is mounted on the transmission end of the opening and closing motor (301b-3); a strip groove (301b-5) is formed at one end of the movable rod (301b-4); and a blocking column (301b-6) passing through the strip groove (301b-5) is fixed at one end of the fixed block (301b-1).

10. The voltage grading device for partial discharge test of open transformer according to claim 7 or 9, characterized in that: The wiring assembly (302) includes a stationary clamp finger (302a) and a movable clamp finger (302b), wherein the stationary clamp finger (302a) is fixed by two fixed columns (302c), a rotating shaft (302d) is rotatably connected between the two fixed columns (302c), and a rope puller (302e) is arranged at the middle position of the outside of the rotating shaft (302d).

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