Novel 35kV waffle transformer bushing

Abstract

The utility model belongs to the technical field of 35kV Hua-transformer bushings, and discloses a novel 35kV Hua-transformer bushing, which comprises a novel 35kV Hua-transformer bushing and a flange, a capacitor core is sleeved inside the novel 35kV Hua-transformer bushing, a shielding net is attached inside the capacitor core, the shielding net is arranged at a position with high field intensity, an epoxy material is arranged inside the shielding net, and the novel 35kV Hua-transformer bushing is arranged on the flange. An insulating material is arranged in the epoxy material, a lower side sleeve is arranged on the outer side of the capacitor core, a grading ring is fixedly connected in the lower side sleeve, a high-voltage conducting rod penetrates through the grading ring, the lower side sleeve is arranged at the bottom end of the flange, and an exhaust position at the top end of the novel 35kV waffle transformer sleeve is designed to be inclined. The outer side of the novel 35kV waffle transformer bushing is arranged to be in the shape of a big umbrella group and a small umbrella group, and through the scheme, the problems that when a ceramic bushing is used as a shell for a long time, the oil leakage phenomenon exists, a shielding net cannot be designed for a high-voltage field intensity concentration position to be used for equalizing a voltage field, and discharge breakdown is likely to happen after long-term use are solved.

Description

Technical Field

[0001] This utility model belongs to the field of 35kV Huabian bushing technology, specifically a new type of 35kV Huabian bushing. Background Technology

[0002] The new 35kV Huabian bushing is composed of a high-voltage conductive rod, a shielding mesh, and epoxy material. Its basic principle is that the high-voltage conductive rod carries current, the shielding mesh shields the electric field, and the epoxy material provides insulation. When installed on high-voltage electrical equipment, the product connects the high-voltage electricity, leading the transformer coil leads to the outside of the tank, and also serves to insulate the leads from the tank and fix the leads.

[0003] Meanwhile, patent application number 201920005302.6 discloses a novel type of transformer substation bushing, including a conductive rod and a transformer substation body. External terminals and internal connectors are fixedly connected to both ends of the conductive rod, respectively. The conductive rod is equipped with an upper porcelain bushing shell, a lower insulating outer ring, and a locking nut, arranged sequentially from the external terminals towards the internal connectors. The upper porcelain bushing shell is fixedly connected to the conductive rod, the lower insulating outer ring is fitted onto the conductive rod, and the locking nut is threadedly connected to the conductive rod. The conductive rod penetrates the transformer substation body, with the upper porcelain bushing shell and external terminals located on the outside of the transformer substation body, and the lower insulating outer ring, locking nut, and internal connector located inside the transformer substation body. This bushing features an upper porcelain bushing shell and a lower insulating outer ring, with the lower insulating outer ring secured to the upper porcelain bushing shell inside the transformer substation body using a nut.

[0004] However, during the implementation of the relevant technology, it was found that the above-mentioned new type of transformer bushing uses ceramic bushing as the outer shell, which will cause oil leakage during long-term use. Furthermore, it is impossible to design a shielding mesh for areas with concentrated high-voltage field strength to equalize the electric field, and long-term use is prone to discharge breakdown problems. Utility Model Content

[0005] To address the problems mentioned in the background art, this utility model provides a novel 35kV Huabian bushing. Addressing the issue of uneven mounting surfaces and easy oil leakage, a new process is employed: using epoxy resin pressure gelation and mold molding, the product has a smooth and flat surface, high strength, good aging resistance, good oil resistance, and low shrinkage rate, ensuring no oil leakage during use. The new process allows for the design of a shielding mesh at locations with high electric field strength, creating a uniform electric field. Under normal use, the partial discharge is less than 10pC, ensuring low partial discharge and low dielectric loss, guaranteeing safe use throughout the product's entire lifespan.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a novel 35kV Huabian bushing, comprising a novel 35kV Huabian bushing and a flange, wherein a capacitor core is sleeved inside the novel 35kV Huabian bushing, and a shielding mesh is attached inside the capacitor core, wherein the shielding mesh is positioned at a high field strength location.

[0007] The shielding mesh is internally lined with epoxy material, and the epoxy material contains insulating material. A lower sleeve is located on the outside of the capacitor core. An equalizing ring is fixedly connected inside the lower sleeve, and a high-voltage conductive rod passes through the equalizing ring. The lower sleeve is located at the bottom of the flange, and epoxy resin pressure gel is used on the outside of the flange. The top venting position of the new 35kV Huabian bushing is designed at an angle, and the outside of the new 35kV Huabian bushing is arranged in the shape of large and small umbrella clusters.

[0008] Preferably, the top end of the new 35kV Huabian bushing is fixedly connected to an oil conservator, the interior of which is hollow. The oil conservator at the bushing head is used to regulate the oil volume change caused by temperature changes, so as to protect the bushing from large pressure. An oil level display window is fitted into the front end of the oil conservator to monitor the oil level. A lead wire connector is installed through the top end of the oil conservator, and a transformer terminal is installed inside the lead wire connector.

[0009] Preferably, a nut is fitted on the outside of the transformer terminal, and nuts are spirally connected to the outside of two sets of nuts. An electrical wire connecting block is fixedly connected to the outside of the transformer terminal.

[0010] Preferably, the novel 35kV Huabian bushing uses epoxy resin pressure gel, the bushing has a fully sealed structure, and the transformer oil inside is an independent system, unaffected by the atmosphere.

[0011] Preferably, a liquid storage tube is sleeved on the outside of the capacitor core, and a sleeve end bottle is fixedly connected to the outside of the liquid storage tube. The inside of the sleeve end bottle is set as a cavity, and an oil sampling port is opened on the right side of the cavity of the sleeve end bottle.

[0012] Preferably, the outer side of the capacitor core is fitted inside the flange, and the top of the flange has several sets of threaded holes. The outer side of the threaded holes is symmetrically arranged on the outer side of the flange, which facilitates the connection of the bolts to the electrical cabinet by inserting them into the threaded grooves on the outer side of the flange.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model improves upon materials by employing an epoxy resin pressure gel process, resulting in good consistency, high efficiency, and high yield during mass production. The process ensures a smooth and even product surface. Furthermore, the angled design of the venting point at the top facilitates venting, preventing pores on the product's surface. In terms of product shape design, the use of umbrella-shaped structures of varying sizes increases the creepage distance on the outer surface, solving the problem of surface flashover. In terms of performance design, it exhibits excellent thermal stability and can withstand instantaneous overheating during short circuits. Through electric field simulation, a shielding mesh is designed at locations with high electric field strength to dominate overall voltage division, balance the electric field distribution, and uniformize the electric field, reducing product discharge and extending product lifespan. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the lower sleeve structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the epoxy material structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the oil display window structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the high-voltage conductive rod structure of this utility model.

[0020] In the diagram: 1. New type 35kV Huabian bushing; 2. Oil conservator; 3. Oil level display window; 4. Transformer terminal; 5. Lead wire connector; 6. Nut; 7. Wire connector block; 8. Flange; 9. Threaded hole; 10. Bushing end bottle; 11. Oil sampling port; 12. Lower bushing; 13. Equalizing ring; 14. Capacitor core; 15. Shielding mesh; 16. Epoxy material; 17. Insulating material; 18. High-voltage conductive rod; 19. Liquid storage pipe. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figures 1 to 5As shown, this utility model provides a novel 35kV Huabian bushing, including a novel 35kV Huabian bushing 1 and a flange 8. A capacitor core 14 is installed inside the novel 35kV Huabian bushing 1, and a shielding mesh 15 is attached inside the capacitor core 14. The shielding mesh 15 is located at a position with high electric field strength. A high-voltage conductive rod 18 passes through the inside of the equalizing ring 13 to equalize the electric field. The product is locally magnified, and long-term use can avoid discharge breakdown.

[0023] The shielding mesh 15 has an internal epoxy material 16, and the epoxy material 16 has an internal insulating material 17. A lower sleeve 12 is located on the outside of the capacitor core 14. The shielding mesh 15 is attached to the inside of the capacitor core 14. The shielding mesh 15 has an internal epoxy material 16, and the epoxy material 16 has an internal insulating material 17. The insulating material 17 has an internal epoxy material 16. The high-voltage conductive rod 18 serves to carry current, the shielding mesh 15 serves to shield the electric field, and the epoxy material 16 serves to insulate. The product is safe. Installed on high-voltage electrical equipment, it serves as a high-voltage connection. An equalizing ring 13 is fixedly connected inside the lower bushing 12, and a high-voltage conductive rod 18 passes through the inside of the equalizing ring 13. The lower bushing 12 is located at the bottom of the flange 8, and epoxy resin pressure gel is used on the outside of the flange 8. The top venting position of the new 35kV Huabian bushing 1 is designed with an incline. The outside of the new 35kV Huabian bushing 1 is set in the shape of large and small umbrella groups. Through the large and small umbrella groups, the creepage distance on the outer surface of the product is increased, and the problem of flash creep on the outer surface is solved.

[0024] Specifically, the top of the new 35kV Huabian bushing 1 is fixedly connected to an oil conservator 2. The interior of the oil conservator 2 is set as a cavity. An oil level display window 3 is fitted at the front end of the oil conservator 2. A lead wire connector 5 is installed through the top of the oil conservator 2. A transformer terminal 4 is installed inside the lead wire connector 5. The oil conservator 2 is set as an integrally formed sealed structure to ensure that it is not subject to external corrosion. The interior of the oil conservator 2 is set as a cavity, and an exhaust pipe is opened at the top of the oil conservator 2 to prevent the internal temperature from getting too high and to buffer the internal oil. The oil level display window 3 is fitted at the front end of the oil conservator 2 for viewing the internal oil level. The lead wire connector 5 is installed through the top of the oil conservator 2. A transformer terminal 4 is installed inside the lead wire connector 5. A nut 6 is fitted on the outside of the transformer terminal 4 for connecting and fixing the lead wire connector 5. Nuts 6 are screwed together on the outside of the two sets of nuts 6. A wire connection block 7 is fixedly connected to the outside of the transformer terminal 4.

[0025] Furthermore, the new 35kV Huabian bushing 1 uses epoxy resin pressure gel, and the top venting position of the new 35kV Huabian bushing 1 is designed at an angle to facilitate the discharge of rainwater and prevent acid rain from seeping into the outside of the new 35kV Huabian bushing 1.

[0026] It is worth noting that a liquid storage tube 19 is sleeved on the outside of the capacitor core 14, and a sleeve end bottle 10 is fixedly connected to the outside of the liquid storage tube 19, so that the testing device can be connected to the sleeve end bottle 10 during maintenance. An oil sampling port 11 is opened on the right side of the cavity of the liquid storage tube 19 for storing liquid. Opening the oil sampling port 11 can be used to take out the oil inside and test the life of the oil.

[0027] It is worth noting that the outer side of the capacitor core 14 is fitted inside the flange 8 and is inserted into the threaded hole 9 by bolts, which is used to connect the flange 8 and the high-voltage electrical cabinet.

[0028] Among them, epoxy material 16 and insulating material 17 are existing technologies and will not be described in detail; at the same time, this utility model also includes a power supply, controller and switch, etc., which are not the main technical points of this patent and will not be described in detail; the "front, back, left and right" perspectives of this device are as follows: Figure 1 The direction shown in the diagram is the reference.

[0029] Working principle:

[0030] First, flange 8 is installed on the top of the transformer and fixed by bolts inserted into the threaded holes 9 inside flange 8. The new 35kV Huabian bushing 1 is set on the top of flange 8, and the lower bushing 12 is set on the bottom of flange 8. During transformer operation, the new 35kV Huabian bushing 1 must withstand high voltage. The insulating material 17 and epoxy material 16 have high insulation resistance and breakdown voltage, which can prevent current from flowing in unexpected paths. When the high voltage winding of the transformer is led out through the inside of the top of the new 35kV Huabian bushing 1, the insulating part of the new 35kV Huabian bushing 1 can isolate the high voltage lead from the transformer shell and other potential parts such as the low voltage winding, ensuring that the power is transmitted according to the predetermined circuit.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A new type 35 kV bushing for a potential transformer, comprising a new type 35 kV bushing for a potential transformer (1) and a flange (8), characterized in that: The novel 35kV Huabian bushing (1) is internally sleeved with a capacitor core (14), the capacitor core (14) is internally attached with a shielding net (15), the shielding net (15) is arranged at a position with high field strength; The shielding net (15) is internally provided with an epoxy material (16), the epoxy material (16) is internally provided with an insulating material (17), the capacitor core (14) is externally provided with a lower sleeve (12), the lower sleeve (12) is internally fixedly connected with a voltage-sharing ring (13), the voltage-sharing ring (13) is internally penetrated by a high-voltage conducting rod (18), the lower sleeve (12) is arranged at the bottom end of a flange (8), the top end of the novel 35kV Huabian bushing (1) is designed as an inclination in the exhaust position, and the novel 35kV Huabian bushing (1) is externally arranged as a size umbrella group shape.

2. A new type of 35 kV bushing for transformer according to claim 1, characterized in that: The top end of the novel 35kV Huabian bushing (1) is fixedly connected with an oil pillow (2), the oil pillow (2) is internally arranged as a cavity, the front end of the oil pillow (2) is embeddedly provided with an oil display window (3), the top end of the oil pillow (2) is internally penetrated by a lead connector (5), and the lead connector (5) is internally provided with a transformer connector (4).

3. A new type of 35 kV bushing for transformer according to claim 2, characterized in that: The transformer connector (4) is fixedly connected with a wire connecting block (7) on the outside.

4. A new type of 35 kV bushing for transformer according to claim 2, characterized in that: The material of the novel 35kV Huabian bushing (1) is an epoxy resin pressure gel.

5. A new type of 35 kV bushing for transformer according to claim 1, characterized in that: The capacitor core (14) is externally sleeved with a liquid storage pipe (19), the liquid storage pipe (19) is fixedly connected with a sleeve end bottle (10) on the outside, the sleeve end bottle (10) is internally arranged as a cavity, and the cavity of the sleeve end bottle (10) is provided with an oil sampling port (11) on the right side.

6. A new type of 35 kV bushing for transformers according to claim 5, characterized by the fact that: The capacitor core (14) is externally sleeved inside the flange (8), the top end of the flange (8) is provided with a plurality of groups of threaded holes (9), and the threaded holes (9) are symmetrically arranged on the outside of the flange (8).

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