Novel-structure low-partial-discharge large-current bushing

Abstract

The utility model discloses a novel structure low partial discharge heavy current bushing, a conducting rod is arranged in the bushing in a penetrating manner, an installation flange, a sleeve and a pressing plate are arranged on the other side of the bushing in parallel, a plurality of locking bolts are in threaded connection with the pressing plate and penetrate through the pressing plate to abut against the sleeve, the locking bolts are screwed, the pressing plate moves axially and abuts against a top plate, and the top plate abuts against the top plate. The top plate axially abuts against the conducting rod, and the mounting flange and the sleeve are axially positioned between the sleeve and the pressing plate through the locking force of the locking bolt. In the assembling process, the capacitive screen and the conducting rod are fixed into a whole, then the conducting rod is inverted and sleeved with the sealing ring and the sleeve, a measuring line is led out from a flange tap opening, then the sealing ring, the installation flange, the base plate, the pressing plate and the top plate are sequentially assembled, finally, the locking bolt is screwed, and assembling of the whole structure is achieved through mutual matching and restraining of the structures. A large number of welding and bolt locking structures are omitted, assembly and disassembly are convenient, the fastening effect is good, and the structure is compact.

Description

Technical Field

[0001] The utility model relates to a high-current bushing with a novel structure and low partial discharge. Background Art

[0002] The 40.5kV-10000A porcelain-coated bushing includes numerous structural parts (such as bushing, conductive rod, mounting flange, porcelain bushing, etc.). During structural assembly, the common practice is to connect adjacent structural parts by bolts (or welding). This fixing method is troublesome to load and unload, and it is difficult to disassemble by welding. Summary of the invention

[0003] The utility model provides a high-current bushing with a novel structure and low partial discharge in order to solve the problems existing in the prior art.

[0004] The technical solutions adopted in this utility model are:

[0005] A novel structure of a high-current bushing with low partial discharge comprises a bushing, a conductive rod, a mounting flange, a sleeve, a pressure plate, a top plate and a locking bolt. The conductive rod is passed through the bushing, and one side of the conductive rod abuts against the corresponding side end face of the bushing. The mounting flange, the sleeve and the pressure plate are arranged in parallel on the other side of the bushing and are all sleeved on the outside of the conductive rod. A plurality of locking bolts are threadedly connected to the pressure plate and pass through the pressure plate to abut against the sleeve. The locking bolts are tightened, the pressure plate moves axially and abuts against the top plate, and the top plate abuts axially against the conductive rod. The mounting flange and the sleeve are axially positioned between the bushing and the pressure plate by the locking force of the locking bolts.

[0006] Furthermore, the two ends of the conductive rod are respectively fixed with a first tail disc and a second tail disc, the diameter of the first tail disc is greater than or equal to the diameter of the casing, the conductive rod is passed through the casing, and the first tail disc abuts against the end surface of the corresponding side of the casing, and the second tail disc extends out of the casing.

[0007] Furthermore, an inwardly recessed limiting groove is provided on the outer circumferential wall of the second tail plate, and the top plate is axially positioned in the limiting groove.

[0008] Furthermore, at least two top plates are provided, and the top plates are half structures with two semicircles, and the thickness of all superimposed top plates is adapted to the slot width of the limiting slot.

[0009] Further, the locking bolt is tightened, the pressure plate moves axially and abuts against the top plate, and the top plate abuts axially against the inner end surface of the second tail plate.

[0010] Furthermore, a capacitive screen is provided on the conductive rod, and a plurality of threaded holes are provided in the circumferential direction at both ends of the capacitive screen. A locking bolt is threadedly connected in each threaded hole. The locking bolt abuts against the outer wall of the conductive rod and fixes the capacitive screen on the conductive rod.

[0011] Furthermore, a pad is provided between the sleeve and the pressing plate, and the locking bolt passes through the pressing plate and abuts against the pad.

[0012] Furthermore, sealing gaskets are provided between the sleeve and the conductive rod, between the sleeve and the mounting flange, between the mounting flange and the sleeve, between the sleeve and the backing plate, and between the pressure plate and the top plate.

[0013] Furthermore, a wire lead hole and an exhaust hole are provided on the mounting flange, and the wire lead hole is communicated with the inner cavity of the sleeve.

[0014] Furthermore, the conductive rod is a hollow or solid structure, and is made of copper or aluminum.

[0015] The utility model has the following beneficial effects:

[0016] During assembly, first fix the capacitor screen and the conductive rod together, then insert the conductive rod upside down into the sleeve, and then assemble the mounting flange, sleeve, pad, pressure plate and top plate in sequence, and finally tighten the locking bolts. The assembly of the structure is achieved through the mutual cooperation between the structures to constrain the whole, which saves a lot of welding and bolt locking structures, is easy to load and unload, and has a good fastening effect.

[0017] The utility model structure is suitable for high current bushings with a current of 10kV~40.5kV and 10000A~60000A, has low partial discharge, good heat dissipation, compact structure, stable performance, easy manufacturing, short delivery cycle and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an assembly diagram of Embodiment 1.

[0019] Figure 2 2 is a structural diagram of the conductive rod in Example 1.

[0020] Figure 3 This is a structural diagram of the mounting flange in Example 1.

[0021] Figure 4 This is the assembly diagram of the second embodiment. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings. Example

[0023] like Figures 1 to 3The utility model discloses a novel structure of a high-current bushing with low partial discharge, comprising a bushing 1, a conductive rod 2, a capacitor screen 3, a mounting flange 4, a sleeve 5 (a porcelain sleeve or a composite sleeve), a pad 6, a pressure plate 7, a top plate 8 and a locking bolt 9. The conductive rod 2 is passed through the bushing 1, and one side of the conductive rod 2 abuts against the left end surface of the bushing 1. The capacitor screen 3 is fixed on the conductive rod 2. The mounting flange 4, the sleeve 5, the pad 6 and the pressure plate 7 are arranged in parallel on the right side of the bushing 1 and are all sleeved on the outer side of the conductive rod 2. The top plate 8 is mounted on the conductive rod 2, and the axial position of the top plate 8 on the conductive rod 2 is fixed. A plurality of locking bolts 9 are threadedly connected to the pressure plate 7, and pass through the pressure plate 7 to abut on the pad 6. The locking bolts 9 are tightened to make the pressure plate 7 abut against the top plate 8 in the opposite direction. The mounting flange 4 and the sleeve 5 are axially positioned between the bushing 1 and the pad 6 by the locking force of the locking bolts 9.

[0024] The conductive rod 2 in the utility model acts as a carrier for axial positioning, and all structural parts cooperate and constrain each other to realize the assembly of the structure. In order to realize the axial positioning of the conductive rod 2 itself in the casing 1 and the axial limit of the top plate 8 on the conductive rod 2, the utility model fixes the first tail disc 21 and the second tail disc 22 (fixed by welding) at both ends of the conductive rod 2 respectively. The diameter of the first tail disc 21 is greater than or equal to the diameter of the casing 1, and the diameter of the second tail disc 22 is less than the diameter of the casing 1. The conductive rod 2 is inserted into the casing 1, and the first tail disc 21 abuts against the left end face of the casing 1, and the second tail disc 22 extends out of the casing 1. A limiting groove 221 recessed inwardly is provided on the outer circumferential wall of the second tail disc 22, and the top plate 8 is axially positioned in the limiting groove 221.

[0025] A connection board 23 is fixed on both the first tail disc 21 and the second tail disc 22 , and the connection boards on both sides are exposed outside the bushing 1 and the top plate 8 respectively.

[0026] To facilitate the assembly of the top plate 8, the top plate 8 in the utility model adopts a half structure, at least two top plates 8 are placed in the limiting groove 221, and the adjacent top plate joint surfaces are staggered with each other, and the thickness of all top plates in the limiting groove is adapted to the groove width of the limiting groove. When in use, the locking bolt 9 passes through the pressure plate 7 and abuts against the pad 6. The locking bolt 9 is rotated, the pressure plate 7 moves to the right and abuts against the top plate 8, and all the top plates 8 are pressed tightly.

[0027] In order to better ensure the positioning effect, a groove is provided on the side of the pressing plate 7 facing the top plate 8. After the pressing plate 7 and the top plate 8 abut against each other, the top plate 8 abuts against the groove. Similarly, a groove for abutting the locking bolt 9 is provided on the backing plate 6.

[0028] In the utility model, the fixing structure of the capacitor screen 3 on the conductive rod 2 is as follows: a plurality of threaded holes are provided in the circumferential direction at both ends of the capacitor screen 3, and a locking bolt is threadedly connected in each threaded hole. The locking bolt abuts against the outer wall of the conductive rod 2 and fixes the capacitor screen 3 on the conductive rod 2. This method is convenient for fixing.

[0029] To ensure the sealing of the overall structure, sealing gaskets are provided between the sleeve 1 and the conductive rod 2, between the sleeve 1 and the mounting flange 4, between the mounting flange 4 and the sleeve 5, between the sleeve 5 and the pad 6, and between the pressure plate 7 and the top plate 8.

[0030] The utility model also has a lead-in hole 41 and an exhaust hole 42 on the mounting flange 4, and the lead-in hole 41 is connected to the inner cavity of the bushing 1. The lead-in hole 41 is used for lead-in detection of the bushing operation state. When the bushing is assembled with the transformer body, the transformer is filled with oil, and the air is discharged through the exhaust hole.

[0031] The conductive rod 2 in the utility model is a hollow or solid structure, and is made of copper or aluminum. Example

[0032] like Figure 4 Different from the first embodiment, in the second embodiment, the top plate is directly abutted against the second tail plate 22, that is, when the locking bolt 9 is tightened, the pressure plate 7 moves axially and abuts against the inner end surface of the top plate 8, and the top plate 8 is axially abutted against the inner end surface of the second tail plate 22.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A new type of low partial discharge high current bushing, characterized by: The invention comprises a sleeve (1), a conductive rod (2), a mounting flange (4), a sleeve (5), a pressure plate (7), a top plate (8) and a locking bolt (9), wherein the conductive rod (2) is inserted into the sleeve (1), and one side of the conductive rod (2) abuts against the corresponding side end surface of the sleeve (1); the mounting flange (4), the sleeve (5) and the pressure plate (7) are arranged in parallel on the other side of the sleeve (1) and are all sleeved on the outside of the conductive rod (2); a plurality of locking bolts (9) are threadedly connected to the pressure plate (7), pass through the pressure plate (7) and abut against the sleeve (5); the locking bolts (9) are tightened, the pressure plate (7) moves axially and abuts against the top plate (8), and the top plate (8) abuts axially against the conductive rod (2); the mounting flange (4) and the sleeve (5) are axially positioned between the sleeve (1) and the pressure plate (7) by the locking force of the locking bolts (9).

2. The novel low partial discharge high current bushing according to claim 1, characterized in that: A first tail disc (21) and a second tail disc (22) are respectively fixed at two ends of the conductive rod (2); the diameter of the first tail disc (21) is greater than or equal to the diameter of the sleeve (1); the conductive rod (2) is inserted into the sleeve (1); the first tail disc (21) abuts against an end surface of a corresponding side of the sleeve (1); and the second tail disc (22) extends out of the sleeve (1).

3. The novel low partial discharge high current bushing according to claim 2, characterized in that: An inwardly recessed limiting groove (221) is provided on the outer circumferential wall of the second tail plate (22), and the top plate (8) is axially positioned in the limiting groove (221).

4. The novel low partial discharge high current bushing according to claim 3, characterized in that: At least two top plates (8) are provided, and the top plates (8) are half structures having two semicircles, and the thickness of all superimposed top plates (8) is adapted to the groove width of the limiting groove (221).

5. The novel low partial discharge high current bushing according to claim 2, characterized in that: The locking bolt (9) is tightened, and the pressure plate (7) moves axially and contacts the top plate (8), and the top plate (8) contacts axially against the inner end surface of the second tail plate (22).

6. The novel low partial discharge high current bushing according to claim 1, characterized in that: The conductive rod (2) is provided with a capacitor screen (3), and a plurality of threaded holes are provided in the circumferential direction at both ends of the capacitor screen (3). A locking bolt is threadedly connected in each threaded hole, and the locking bolt abuts against the outer wall of the conductive rod (2) to fix the capacitor screen (3) on the conductive rod (2).

7. The novel low partial discharge high current bushing according to claim 1, characterized in that: A backing plate (6) is provided between the sleeve (5) and the pressing plate (7), and a locking bolt (9) passes through the pressing plate (7) and abuts against the backing plate (6).

8. The novel low partial discharge high current bushing according to claim 1, characterized in that: Sealing gaskets are provided between the sleeve (1) and the conductive rod (2), between the sleeve (1) and the mounting flange (4), between the mounting flange (4) and the sleeve (5), between the sleeve (5) and the backing plate (6), and between the pressure plate (7) and the top plate (8).

9. The novel low partial discharge high current bushing according to claim 1, characterized in that: The mounting flange (4) is provided with a wire guide hole (41) and an exhaust hole (42), and the wire guide hole (41) is communicated with the inner cavity of the sleeve (1).

10. The novel low partial discharge high current bushing according to claim 1, characterized in that: The conductive rod (2) is a hollow or solid structure and is made of copper or aluminum.

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