Pouring type semi-insulating structure

Abstract

The utility model provides a pouring type semi-insulating structure, which comprises a conductor, an epoxy resin pouring layer, a thermal shrinkage sheath, a feed end flange terminal plate and a discharge end flange terminal plate, one end of the conductor is connected with the end face of the feed end flange terminal plate, and the other end is connected with the end face of the discharge end flange terminal plate. The outer diameter of the conductor, the outer diameter of the feeding end flange terminal plate and the outer diameter of the discharging end flange terminal plate are sleeved with thermal shrinkage sheaths, and the space formed between the conductor and the thermal shrinkage pipe is an epoxy resin pouring layer. A feeding through hole is formed in the feeding end flange terminal plate and is communicated with the epoxy resin pouring layer; a discharging through hole is formed in the discharging end flange terminal plate and is communicated with the epoxy resin pouring layer; epoxy resin can be injected outside the conductor, a shielding layer is omitted, the production period is short, the interphase short circuit risk is shielded, the production period is shortened, the cable is suitable for extra-urgent engineering projects, and operation safety is guaranteed as much as possible under the condition that the full-insulation construction period is not met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of semi-insulated tubular bus, especially pouring type semi-insulated structure. BACKGROUND

[0002] The busbar often has single-phase grounding and phase-to-phase short-circuit accidents in use, and has poor reliability; the full-insulated busbar has complex process and long production cycle, and has high requirements on product process, and often has insulation breakdown, joint damp discharge and other accidents in operation, and the replacement cycle is long. The existing semi-insulated tubular busbar is similar to the busbar, and only a layer of heat shrinkable sheath is added outside the conductor, and if there is external contact, single-phase grounding and phase-to-phase short-circuit accidents will inevitably occur.

[0003] The full-insulated tubular busbar needs to completely isolate the conductor from the external environment to avoid any risk of leakage or discharge; the core goal of the full-insulated tubular busbar is to realize a defect-free uniform insulation layer to ensure the absolute insulation reliability under high voltage. The semi-insulated tubular busbar allows part of the conductor to be exposed (such as the connection end or the contact part), and only needs to be insulated in a specific area; the insulation layer does not need to be completely sealed, and even needs to retain the heat dissipation or grounding function of the conductor; the application of the full-insulation technology destroys the design intention of the semi-insulation, and how to improve the insulation performance of the semi-insulation is a problem to be solved. UTILITY MODEL CONTENTS

[0004] In view of the above problems, the purpose of the utility model is to provide a semi-insulated tubular busbar which is safe and reliable, has simple process and short production cycle.

[0005] To achieve part or all of the above purposes or other purposes, the application provides the following technical solution: a pouring type semi-insulated structure, comprising a conductor, an epoxy resin pouring layer, a heat shrinkable sheath, an inlet end flange terminal plate, an outlet end flange terminal plate, a first terminal and a second terminal; one end of the conductor is connected to the end face of the inlet end flange terminal plate, and the other end of the conductor is connected to the end face of the outlet end flange terminal plate; the conductor, the inlet end flange terminal plate and the outlet end flange terminal plate are sleeved with the heat shrinkable sheath, and the space formed between the conductor and the heat shrinkable tube is the epoxy resin pouring layer; the inlet end flange terminal plate is provided with an inlet through hole, and the inlet through hole communicates with the epoxy resin pouring layer; the outlet end flange terminal plate is provided with an outlet through hole, and the outlet through hole communicates with the epoxy resin pouring layer; one end of the conductor is connected to the second terminal through the inlet end flange terminal plate, and the other end of the conductor is connected to the first terminal through the outlet end flange terminal plate.

[0006] Further, the conductor is a copper pipe.

[0007] Further, the conductor is a copper pipe.

[0008] Further, the feeding through hole has two, and the discharging through hole has two.

[0009] Further, the feeding end flange terminal plate diameter is greater than the conductor diameter, and the discharging end flange terminal plate diameter is greater than the conductor diameter.

[0010] Further, the epoxy resin pouring layer is provided with a slope at two ends.

[0011] Compared with the prior art, the utility model has the advantages that: the utility model adds epoxy resin outside the conductor, cancels the shielding layer, shortens the production period, and reduces the risk of shielding phase short circuit.

[0012] The utility model discloses an epoxy resin pouring semi-insulated tubular bus, and the conductor adopts T2Y copper pipe, which has low skin effect and high strength. The copper pipe is welded with flange terminal plates at two ends, so that the contact area of two busbars or terminal connection can meet the standard requirement. The copper pipe is uniformly wound with semiconductor crepe paper and then uniformly wound with insulating crepe paper, so that the epoxy resin does not crack and is resistant to aging during operation. The crepe paper is sleeved with a heat-shrinkable sheath outside, which has a protective effect. The copper pipe and the heat-shrinkable sheath are impregnated (poured) with an epoxy resin mixture that meets the process requirement to form an integrated body. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structure schematic view of the utility model pouring type semi-insulated structure;

[0014] Figure 2 It is an A-A sectional view in Figure 1

[0015] Figure 3 It is a B-B sectional view in Figure 1

[0016] Figure 4 It is a structure schematic view of the utility model entering the furnace;

[0017] Figure 5 It is a structure schematic view of step three;

[0018] Figure 6 It is a structure schematic view of step four;

[0019] Figure 7 It is a structure schematic view of step seven;

[0020] Figure 8 It is a structure schematic view of placing the U-shaped insulated busbar that has been bandaged on the bracket in step eight;

[0021] Figure 9 ​​Structure diagram of placing the insulated busbar in step eight on the bracket;

[0022] Figure 10 Structure diagram of pipeline connection in step eight;

[0023] Figure 11 Structure diagram of pouring type semi-insulated structure in step five;

[0024] Figure 12 Structure diagram of pouring type semi-insulated structure in step seven;

[0025] Figure 13 Structure diagram of pouring type semi-insulated structure in step eight;

[0026] In the figure: 1, conductor, 2, semiconductor crepe paper, 3, insulating crepe paper, 4, epoxy resin pouring layer, 5, heat shrinkage sheath, 6, flange terminal plate of discharge end, 601, discharge through hole, 7, flange terminal plate of feeding end, 701, feeding through hole, 8, No. 2 terminal, 9, No. 1 terminal, 10, furnace, 11, pressure mixing tank, 12, observation cup, 13, vacuum pump, 14, shrinkage belt, 15, pipe clamp. DETAILED DESCRIPTION

[0027] In order to make the structure and function of the utility model more clear, the technical scheme in the utility model embodiment will be clearly and completely described below by combining the drawings in the utility model embodiment.

[0028] Referring to the drawings Figures 1-13The pouring type semi-insulating structure comprises a conductor 1, an epoxy resin pouring layer 4, a heat shrinkage sheath 5, a feeding end flange terminal plate 7, a discharging end flange terminal plate 6, a first terminal 9 and a second terminal 8; one end of the conductor 1 is connected to the end face of the feeding end flange terminal plate 7, and the other end of the conductor 1 is connected to the end face of the discharging end flange terminal plate 6; the conductor 1, the feeding end flange terminal plate 7 and the discharging end flange terminal plate 6 are sleeved with the heat shrinkage sheath 5, and the space formed between the conductor 1 and the heat shrinkage sheath 5 is the epoxy resin pouring layer 4; the feeding end flange terminal plate 7 is provided with feeding through holes 701 which are communicated with the epoxy resin pouring layer 4; the discharging end flange terminal plate 6 is provided with discharging through holes 601 which are communicated with the epoxy resin pouring layer 4; one end of the conductor 1 is connected to the second terminal 8 through the feeding end flange terminal plate 7, and the other end of the conductor 1 is connected to the first terminal 9 through the discharging end flange terminal plate 6; the conductor 1 is a copper pipe; the semiconductor corrugated paper 2 and the insulating corrugated paper 3 are sequentially and uniformly arranged on the outer circumferential surface of the conductor 1; the feeding through holes 701 are two in number, and the discharging through holes 601 are two in number; the diameter of the feeding end flange terminal plate 7 is greater than the diameter of the conductor 1, and the diameter of the discharging end flange terminal plate 6 is greater than the diameter of the conductor 1; and the two ends of the epoxy resin pouring layer 4 are provided with slopes.

[0029] The manufacturing process of the pouring type semi-insulating structure comprises the following steps.

[0030] Step one, pre-drying treatment of the semiconductor corrugated paper 2 and the insulating corrugated paper 3: the semiconductor corrugated paper 2 and the insulating corrugated paper 3 are placed into a drying box for drying treatment, the temperature is 70±5℃, and the time is not less than 5h;

[0031] Step two, sanding the surface of the conductor 1 by using fine sandpaper and a sander, and wiping clean by using alcohol;

[0032] Step three, wrapping the zero screen on the conductor 1 by using the semiconductor corrugated paper 2: the semiconductor corrugated paper 2 with a width of 40mm is wrapped by 1 / 3 overlapping, and the two end heads of the zero screen need to be left unwrapped for 20mm to form the zero screen end part, and the epoxy resin pouring layer between the zero screen end part and the heat shrinkage tube is in a slope shape; the 20mm left unwrapped is for better winding, and if the root part is attached, the edge is easy to be raised, the end head needs to be found to be flush, the end head of the semiconductor corrugated paper 2 needs to be cut into a semicircular arc, and the corrugations of the corrugated paper are slightly unfolded during wrapping;

[0033] Step four, the insulating layer is wrapped with the insulating corrugated paper 3 on the zero screen: the insulating layer is wrapped with the insulating corrugated paper 3 with a thickness of 0.05 mm and a width of 40 mm, the thickness of the insulating layer wrapped on the zero screen is 2 mm, the 2 mm thick insulating layer is wrapped with 2 layers of the insulating corrugated paper 3, the insulating corrugated paper 3 is wrapped according to 2 / 3-4 / 5, in general, the first layer can be slightly denser, the second layer can be slightly looser, and the size is adjusted; when the insulating corrugated paper 3 is wrapped, the corrugations should not be completely opened, but just opened, so that the epoxy resin can be easily immersed. The copper pipe is uniformly wrapped with the insulating corrugated paper 3, so as to ensure that the epoxy resin does not crack and is resistant to aging during operation. The corrugated paper is wrapped with 2 mm, and the final epoxy resin is immersed to form a 2 mm insulating layer.

[0034] Step five, the heat shrink tube is sleeved on the insulating layer, the feeding end flange terminal plate 7 and the discharging end flange terminal plate 6: the appropriate size of the heat shrink tube is selected according to the outer diameter of the bus bar, and the heat shrink tube is sleeved on the bus bar, since the heat shrink tube will be elongated to both ends when it is shrunk, therefore, the both ends are appropriately short when the material is cut, generally about 300 mm, then the heat shrink tube is shrunk and clamped on the bus bar by baking from the middle section of the bus bar to both sides with the spray gun, the baking is uniformly baked along the circumferential direction, and the heat shrink tube is straightened by another person; when the circular arc part is baked, the outer circular surface is baked first, and then the inner circular surface is baked;

[0035] Step six, the heat shrink tube is shrunk and clamped on the bus bar, the feeding end flange terminal plate and the discharging end flange terminal plate by baking from the middle section of the bus bar to both sides with the spray gun, the baking is uniformly baked along the circumferential direction, and the heat shrink tube is straightened at the same time; when the circular arc part is baked, the outer circular surface is baked first, and then the inner circular surface is baked; the heat shrink tube, the feeding end flange terminal plate, the conductor, the semiconductor corrugated paper end surface and the insulating corrugated paper end surface form a first cavity; the heat shrink tube, the discharging end flange terminal plate, the conductor, the semiconductor corrugated paper end surface and the insulating corrugated paper end surface form a second cavity;

[0036] Step seven: the heat shrink tube is wrapped with the shrink tape 14 on the outside: the heat shrink tube is wrapped with one layer (1 / 3 of the wrapped layer) of the shrink tape 14 on the outside, so as to protect the heat shrink tube, and prevent the heat shrink tube from being deformed during the drying and resin immersion process (pressurization) in the drying oven 10, the shrink tape 14 is wrapped with several layers at the beginning and the end, and is clamped with the pipe clamp 15 at the color rubber belt, so as to ensure that the sealing is not leaked;

[0037] Step eight, the epoxy resin is poured into the feeding through hole 701 of the feeding end flange terminal plate 7; the specific steps are as follows:

[0038] a, product preparation before entering the oven 10: the drying oven 10 is cleaned, the injection cup, the injection pipe joint and the resin stirring tank joint are cleaned with the cleaning agent, and the corresponding observation cup 12 and the storage cup are placed on the oven 10 according to the number of products entering the oven 10;

[0039] b. Product into the furnace 10: the insulated busbar has been wrapped, placed on the bracket, and pushed into the drying oven 10. Since the shape of the closed insulated busbar is various, there are straight insulated busbar, right-angle insulated busbar, and U-shaped insulated busbar. When the product is put into the furnace 10, the long side of the busbar is close to the bottom of the furnace 10, and the short side is close to the wall of the furnace 10. The straight insulated busbar has been wrapped, and the outlet end is raised a little (the busbar is padded with busbar clamp or other arc-shaped objects, and the zero screen end part should not be padded). This will be conducive to the impregnation of the resin. The special-shaped busbar (such as right-angle insulated busbar and U-shaped insulated busbar) is limited in space in the furnace 10 and cannot be padded. Padding is not necessary, and it is better to pad when the space allows. It can also be normal casting without padding.

[0040] c. Pipeline connection: the products in the furnace 10 are connected one by one. The upper end of the busbar outlet is connected to the lower end of the observation cup 12 by a silica gel pipe. The lower end of the busbar is connected to the communication device of the pressure mixing tank 11. The busbar label is marked at the outlet valve of the communication device. The upper end of the observation cup 12 is connected to the vacuum pipeline evacuation valve. The valve connection of the front end of the communication device is connected to the storage cup.

[0041] d. Inject epoxy resin material: for straight insulated busbar, the inlet end (the lower end) is injected with resin, and the outlet end (the higher end) is vacuumed by the vacuum pump 13.

[0042] e. Pipeline removal;

[0043] f. Casting type semi-insulated structure out of the furnace 10.

[0044] Step nine: after the epoxy resin is solidified, the shrinkable tape 14 is removed.

[0045] The semi-insulated tubular busbar is wrapped only with the busbar tube, and the end or connection is exposed. The material and manufacturing cost are relatively low. The insulation of the semi-insulated tubular busbar is formed by a skeleton of corrugated paper, and then a heat-shrinkable tube is shrunk, and the whole is impregnated by epoxy resin to become an integral whole.

[0046] The 1 / 3, 2 / 3, and 4 / 5 overlapping wrapping mentioned above means that the semiconductor corrugated paper 2 / insulating corrugated paper 3 is wrapped around the object to be wrapped, and the width of each overlap is 1 / 3, 2 / 3, and 4 / 5 of the width of the semiconductor corrugated paper 2 / insulating corrugated paper 3. During the wrapping process, the tension of the semiconductor corrugated paper 2 / insulating corrugated paper 3 should be uniform to avoid looseness or wrinkles. According to the above method, the semiconductor corrugated paper 2 / insulating corrugated paper 3 is continuously wrapped until the desired wrapping length or number of layers is reached. The overlapping part between each circle should be tightly fitted without gaps.

[0047] The above disclosure is only the preferred embodiment of the present application, and of course cannot limit the scope of the right of the present application. Therefore, the equivalent changes made according to the claims of the present application still fall within the scope of the present application.

Claims

1. A cast semi-insulating structure, characterized by: It includes conductor, epoxy resin pouring layer, heat shrinkage sheath, feeding end flange terminal plate, discharging end flange terminal plate, No. 1 terminal and No. 2 terminal;The conductor is connected with the end face of the feeding end flange terminal plate at one end, and is connected with the end face of the discharging end flange terminal plate at the other end;The outer diameter of the conductor, the outer diameter of the feeding end flange terminal plate and the outer diameter of the discharging end flange terminal plate are sleeved with the heat shrinkage sheath, and the space formed between the conductor and the heat shrinkage pipe is the epoxy resin pouring layer;The feeding end flange terminal plate is provided with feeding through holes, and the feeding through holes are communicated with the epoxy resin pouring layer;The discharging end flange terminal plate is provided with discharging through holes, and the discharging through holes are communicated with the epoxy resin pouring layer;The conductor is connected with the No. 2 terminal through the feeding end flange terminal plate at one end, and is connected with the No. 1 terminal through the discharging end flange terminal plate at the other end.

2. The casted semi-insulating structure according to claim 1, characterized in that: The conductor is copper pipe.

3. The casted semi-insulating structure according to claim 1, characterized in that: The conductor outer peripheral surface is sequentially and uniformly provided with semiconductor corrugated paper and insulating corrugated paper.

4. The casted semi-insulating structure of claim 1, wherein: The feeding through holes are two, and the discharging through holes are two.

5. The casted semi-insulating structure of claim 1, wherein: The diameter of the feeding end flange terminal plate is greater than the diameter of the conductor, and the diameter of the discharging end flange terminal plate is greater than the diameter of the conductor.

6. The casted semi-insulating structure of claim 1, wherein: The two ends of the epoxy resin pouring layer are provided with slopes.

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