Novel support structure for phase isolated bus

Abstract

The invention relates to the technical field of isolated-phase bus manufacturing, in particular to a novel isolated-phase bus supporting structure which comprises porcelain bottle bases which are fixed to an enclosed bus shell and are arranged in an up-down opposite mode, and each porcelain bottle base is provided with a hollow inner cavity and communicates with an inner cavity of the enclosed bus shell. An annular outer edge is formed at one end, far away from the enclosed bus shell, of the porcelain bottle base, a circular flange is connected to the annular outer edge through a bolt and a nut, a through hole is formed in the center of the circular flange, and an insulator located in an inner cavity of the enclosed bus shell is vertically connected in the through hole through a center bolt and a spring washer. The other end of the insulator is connected with a fitting used for supporting the enclosed bus conductor through a bolt. According to the invention, the use amount of the insulators is reduced, the cost is reduced, the contact area between the insulators and the bus conductor is increased, the stability is ensured, and the IP65 protection grade requirement of the enclosed bus is met.

Description

Technical Field

[0001] The present invention and the technical field of phase-isolated enclosed busbar manufacturing particularly relate to a novel support structure for a phase-isolated busbar. Background Art

[0002] The isolated phase enclosed busbar is a kind of electrical equipment, which is widely used in power plants. The generators in the power plants are connected to the excitation transformer, PT cabinet, plant transformer, main transformer and other electrical equipment through the isolated phase enclosed busbar to transmit power to them. The isolated phase enclosed busbar is an important primary medium voltage transmission electrical equipment in large-scale power generation.

[0003] The phase-isolated enclosed busbar is divided into three parts: conductor, shell, and supporting insulator. The conductor and shell of the phase-isolated enclosed busbar are both cylindrical structures. The traditional phase-isolated enclosed busbar uses three groups of insulators to support the conductor of the phase-isolated enclosed busbar, so that the conductor and shell of the phase-isolated enclosed busbar are air-isolated, achieving the effect of shielding the conductor of the enclosed busbar. This type of product is widely used in power plants. With the diversification of power plant equipment products, the plant transformer in the power plant is connected to the plant switchgear using a phase-isolated enclosed busbar connection. This type of phase-isolated enclosed busbar product generally has a relatively low voltage level and a relatively small current. The specifications of the selected phase-isolated enclosed busbar are also relatively small, and the specifications, dimensions and weight of the conductor and shell of the enclosed busbar are relatively small. The use of traditional three groups of insulators for support is relatively wasteful of insulators. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a new support structure for a phase-isolated busbar, which saves costs and reduces the production process. At the same time, it can also meet the insulation, voltage resistance, lightning impulse and other formal tests of the closed busbar, and meet the IP65 protection level requirements of the closed busbar, thus adding a new product to the closed busbar products.

[0005] The present invention is achieved through the following technical solutions:

[0006] A new type of support structure for an isolated-phase busbar is provided, comprising a porcelain bottle base which is fixed on a closed busbar shell and arranged vertically opposite to each other, the porcelain bottle base is provided with a hollow inner cavity and is connected to the inner cavity of the closed busbar shell, an annular outer edge is formed at one end of the porcelain bottle base away from the closed busbar shell, and a circular flange is connected to the annular outer edge through bolts and nuts, a through hole is provided at the center of the circular flange, and an insulator located in the inner cavity of the closed busbar shell is vertically connected in the through hole through a center bolt and a spring washer, and a hardware for supporting the closed busbar conductor is connected to the other end of the insulator through bolts.

[0007] Furthermore, a side of the hardware that contacts the closed busbar conductor is formed with an arc-shaped concave surface that matches the shape of the closed busbar conductor.

[0008] By providing an arc-shaped concave surface, the contact area between the hardware and the closed busbar conductor can be increased, thereby improving the stability of the support.

[0009] Furthermore, two embedded bolt holes are formed on the end face of the insulator facing the hardware, and two bolt through holes facing the embedded bolt holes are opened on the arc-shaped concave surface of the hardware. A limiting ring is formed in each bolt through hole, and a countersunk bolt connecting the hardware and the insulator is connected at the limiting ring.

[0010] Two embedded bolt holes are provided on the end faces of the insulator and the fittings, which are arranged opposite to the bolt through holes on the arc-shaped concave surface of the fittings. The insulator and the fittings can be connected and fixed by countersunk bolts in combination with a limiting ring.

[0011] Furthermore, a central bolt hole facing the through hole of the circular flange and used for connecting the insulator and the circular flange with a central bolt is provided on the end surface of the insulator facing the circular flange and the sealing gasket.

[0012] The other end of the insulator is connected and fixed to the circular flange through a center bolt that cooperates with a center bolt hole opened on the end surface.

[0013] Furthermore, a sealing gasket is pressed between the annular outer edge of the porcelain bottle base and the circular flange.

[0014] By arranging a sealing gasket between the annular outer edge of the porcelain bottle base and the circular flange, the sealing effect between the porcelain bottle and the circular flange can be effectively packaged to avoid water leakage between the porcelain bottle base and the shell.

[0015] Furthermore, the hardware and the insulator are hardware and insulators made of DMC composite material respectively.

[0016] By selecting hardware and insulators made of DMC materials, good insulation performance is ensured while providing good supporting strength, which helps to ensure overall safety and stability.

[0017] Furthermore, a sealing structure is installed between the center bolt and the circular flange. The sealing structure includes an annular sealing sleeve sleeved on the center bolt. A sealing groove is provided on the side of the annular sealing sleeve in contact with the circular flange, and an O-ring is arranged in the sealing groove.

[0018] A sealing structure is arranged between the center bolt and the circular flange, and the annular sealing sleeve cooperates with the O-ring seal to effectively seal the joint, thereby effectively avoiding water leakage and improving the overall waterproof level.

[0019] Beneficial effects of the present invention:

[0020] The present invention changes the traditional support method of the phase-separated closed busbar, and adopts a support method of two insulators arranged up and down, which saves the number of insulators to be installed. At the same time, because an arc-shaped concave surface is formed on the surface of the hardware, the contact area with the closed busbar conductor can be increased. Compared with the point-like contact support between the insulator and the busbar conductor in the traditional method, the upper and lower support method adopted by the present invention makes the conductor and the shell more firmly fixed. At the same time, a sealing gasket is arranged between the circular flange and the porcelain bottle base, and a sealing structure is arranged between the center bolt and the circular flange, which also ensures the sealing performance of the medium-voltage closed busbar and meets the IP65 sealing performance of the medium-voltage closed busbar.

[0021] The novel medium-voltage phase-isolated enclosed busbar support method of the present invention saves 1 / 3 of raw materials and 1 / 3 of the time for welding the porcelain bottle base and assembling compared to the traditional medium-voltage phase-isolated enclosed busbar support method, greatly saving material costs and labor costs. In addition, the fixing method is simple, saving raw materials, time, labor and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 The figure is a schematic diagram of the installation of the present invention inside a closed busbar housing.

[0024] Figure 3 It is a schematic diagram of the explosion of the present invention.

[0025] Figure 4 for Figure 4 Bottom view of the metal fittings.

[0026] Figure 5 It is a schematic diagram of the side cross-sectional structure of the insulator in the present invention.

[0027] As shown in the figure:

[0028] 1. Closed busbar casing, 2. Busbar conductor, 3. Porcelain bottle base, 4. Round flange, 5. Sealing gasket, 6. Bolt, 7. Center bolt, 8. Insulator, 9. Hardware, 10. Countersunk bolt, 11. Annular outer edge, 12. Bolt through hole, 13. Arc-shaped concave surface, 14. Embedded bolt hole, 15. Center bolt hole, 16. Spring washer, 17. Annular sealing sleeve, 18. O-ring. DETAILED DESCRIPTION

[0029] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0030] A new type of phase-isolated busbar support structure includes a porcelain bottle base 3 fixed on a closed busbar shell 1 and arranged opposite to each other up and down. The closed busbar shell 1 has through holes arranged opposite to each other up and down for welding the porcelain bottle base 3 to fix it to the closed busbar shell 1. After welding, the two porcelain bottle bases 3 face each other and form an angle of 180°.

[0031] The porcelain bottle base 3 is provided with a hollow inner cavity and communicates with the inner cavity of the closed busbar housing 1. An annular outer edge 11 is formed at one end of the porcelain bottle base 3 away from the closed busbar housing 1, and a circular flange 4 is connected to the annular outer edge 11 through bolts 6 and nuts. In order to improve the sealing performance, a sealing gasket 5 is also pressed between the annular outer edge 11 of the porcelain bottle base 3 and the circular flange 4. In this embodiment, five bolt holes are evenly opened at the same position on the annular outer edge 11, the circular flange 4 and the sealing gasket 5, and the three are connected and fixed by five bolts 6.

[0032] A through hole is provided at the center of the circular flange 4, and an insulator 8 located in the inner cavity of the closed busbar housing 1 is vertically connected in the through hole through a center bolt 15 and a spring washer 16, and a hardware 9 for supporting the closed busbar conductor 2 is connected to the other end of the insulator 8 through a bolt. An arc-shaped concave surface 13 matching the shape of the closed busbar conductor 2 is formed on the side of the hardware 9 abutting against the closed busbar conductor 2. In this embodiment, the hardware 9 and the insulator 8 are respectively a hardware made of DMC composite material and an insulator made of DMC composite material.

[0033] Two embedded bolt holes 14 are formed on the end face of the insulator 8 facing the hardware 9, and two bolt through holes 12 facing the embedded bolt holes 14 are formed on the arc-shaped concave surface 13 of the hardware 9. A limiting ring is formed in each bolt through hole 12, and a countersunk bolt 10 for connecting the hardware 9 and the insulator 8 is connected at the limiting ring.

[0034] The end surface of the insulator 8 facing the circular flange 4 and the sealing gasket 5 is provided with a central bolt hole 15 facing the through hole of the circular flange 4 and used for the central bolt 7 to connect the insulator 8 with the circular flange 4. In order to ensure the sealing of the connection between the central bolt 7 and the circular flange 4, a sealing structure is also installed between the central bolt 7 and the circular flange 4. The sealing structure includes an annular sealing sleeve 17 sleeved on the central bolt 7. A sealing groove is provided on the side of the annular sealing sleeve 17 in contact with the circular flange 4, and an O-ring 18 is arranged in the sealing groove.

[0035] The present invention adds a new solution to the support mode of medium-voltage phase-separated busbar, which provides an additional option for medium-voltage phase-separated busbar support. It is particularly suitable for medium-voltage phase-separated closed busbars with low voltage level, small current and small conductor shell selection of phase-separated closed busbars. Compared with the conventional medium-voltage phase-separated closed busbar design, it reduces the production cost, saves raw materials and improves production efficiency. It is widely used in medium-voltage phase-separated closed busbar projects where plant transformers are connected to 6Kv switch cabinets in power plant equipment.

[0036] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A new type of phase-isolated busbar support structure, characterized by: It includes a porcelain bottle base fixed on the closed busbar shell and arranged vertically opposite to each other. The porcelain bottle base is provided with a hollow inner cavity and is connected to the inner cavity of the closed busbar shell. An annular outer edge is formed on the end of the porcelain bottle base away from the closed busbar shell, and a circular flange is connected to the annular outer edge through bolts and nuts. A through hole is opened in the center of the circular flange, and an insulator located in the inner cavity of the closed busbar shell is vertically connected in the through hole through a center bolt and a spring washer. The other end of the insulator is connected to a hardware for supporting the closed busbar conductor through a bolt.

2. The novel support structure for phase-isolated busbar according to claim 1 is characterized in that: A side of the hardware that contacts the closed busbar conductor is formed with an arc-shaped concave surface that matches the shape of the closed busbar conductor.

3. The novel support structure for phase-isolated busbar according to claim 2 is characterized in that: Two embedded bolt holes are formed on the end face of the insulator facing the hardware, and two bolt through holes facing the embedded bolt holes are opened on the arc-shaped concave surface of the hardware. A limiting ring is formed in each bolt through hole, and a countersunk bolt connecting the hardware and the insulator is connected at the limiting ring.

4. The novel support structure for the phase-isolated busbar according to claim 2 is characterized in that: The end surface of the insulator facing the circular flange and the sealing gasket is provided with a central bolt hole facing the through hole of the circular flange and used for connecting the insulator and the circular flange with a central bolt.

5. The novel phase-isolated busbar support structure according to claim 1 is characterized in that: A sealing gasket is also pressed between the annular outer edge of the porcelain bottle base and the circular flange.

6. The novel support structure for phase-isolated busbar according to claim 1 is characterized in that: The hardware fittings and insulators are hardware fittings made of DMC composite materials and insulators made of DMC composite materials respectively.

7. The novel phase-isolated busbar support structure according to claim 1 is characterized in that: A sealing structure is also installed between the center bolt and the circular flange. The sealing structure includes an annular sealing sleeve sleeved on the center bolt. A sealing groove is provided on the side of the annular sealing sleeve in contact with the circular flange, and an O-ring is arranged in the sealing groove.

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