Termination structure for connecting electrical penetration assembly

Abstract

The utility model relates to the technical field of electrical connection of a high-temperature gas cooled reactor, and discloses a terminating structure for connecting an electrical penetration assembly, which is characterized in that a flat and straight surface arranged on a semi-cylindrical conductor is attached to a flat and straight surface of a semi-cylindrical structure on a binding post of the electrical penetration assembly, and the semi-cylindrical conductor and the binding post are connected through a first fastener; one end of the transition section is connected with the semi-cylindrical conductor, and the other end is connected with the flat section; the flat and straight faces of the two wiring noses are attached to the flat and straight faces of the two sides of the flat plate section respectively, and the wiring noses and the flat plate section are connected through second fasteners. According to the invention, the semi-cylindrical conductor is attached to the flat and straight surface of the semi-cylindrical structure on the binding post of the electrical penetration assembly, and the flat and straight surfaces of the two wiring noses are respectively attached to the flat and straight surfaces of the two sides of the flat plate section, so that the contact area of wiring is increased, the two wiring noses are reliably arranged, and the risk of heating and burnout of the terminating part is remarkably reduced.

Description

Technical Field

[0001] This utility model relates to the field of electrical connection technology for high-temperature gas-cooled reactors, and specifically to an end connection structure for connecting electrical penetrations. Background Technology

[0002] During the electrical connection of the primary helium blower in the high-temperature gas-cooled reactor, an electrical penetration device is typically used to connect to the 6kV motor of the primary helium blower to supply power to the 6kV motor. This electrical penetration device is a medium-voltage electrical connection device.

[0003] refer to Figure 1 As shown, three terminals 1 are provided on each side of the electrical penetration member. The three terminals 1 are arranged in a triangle and are evenly distributed on a circumference with a diameter of 125 mm. Each terminal 1 is a semi-cylindrical structure with a length of 80 mm and a width of 31.9 mm on its flat surface. Generally, two medium-voltage power cable cores with a cross-sectional area of ​​120 square millimeters need to be connected to each terminal 1 via a connector lug. Since it is not possible to properly arrange two connector lugs on the flat surface of the 80 mm length of the terminal 1, two connector lugs can only be arranged diagonally, which significantly reduces the contact area between the connector lug and the terminal 1, resulting in a significant increase in the risk of overheating and burning at the termination connection. Utility Model Content

[0004] In view of this, the present invention provides a termination structure for connecting electrical penetrations, in order to solve the problem that the existing two wiring lugs cannot be properly arranged on the flat surface of the 80 mm length of the terminal of the electrical penetration, and can only be arranged obliquely, which significantly reduces the termination contact area between the wiring lugs and the terminal, resulting in a significant increase in the risk of overheating and burning at the termination connection.

[0005] This utility model provides a termination structure for connecting electrical penetration components, including:

[0006] A semi-cylindrical conductor has a flat surface that is in contact with the flat surface of the semi-cylindrical structure on the terminal of the electrical penetration component, and the semi-cylindrical conductor and the terminal are connected by a first fastener.

[0007] The transition section is connected at one end to the semi-cylindrical conductor;

[0008] A flat section is connected to the other end of the transition section; the flat surfaces of the two connector lugs respectively abut against the flat surfaces on both sides of the flat section, and the two connector lugs and the flat section are connected by a second fastener. Beneficial effects: This application adopts the above technical solution, by having the flat surfaces of the semi-cylindrical structure on the upper semi-cylindrical structure of the electrical penetration component's terminal block abut against the flat surfaces on both sides of the flat section, the contact area of ​​the connector lugs is significantly increased, allowing for reliable arrangement of the two connector lugs and significantly reducing the risk of overheating and burning at the termination connection; furthermore, extending the connection of the connector lugs outwards and connecting the two connector lugs on both sides of the flat section significantly increases the operating space, ensuring a tightness effect and facilitating effective and accurate pre-tightening torque detection.

[0009] Optionally, the length of the semi-cylindrical conductor is the same as the length of the straight surface of the semi-cylindrical structure, and the diameter of the semi-cylindrical conductor is the same as the diameter of the semi-cylindrical structure. Beneficial effects: By adopting the above technical solution, this application maximizes the contact area between the semi-cylindrical conductor and the terminal block, ensuring a reliable connection and significantly reducing the risk of overheating and burning at the termination connection.

[0010] Optionally, connection holes are provided on both the arc-shaped surface of the semi-cylindrical conductor and the terminal block; a groove is provided on the arc-shaped surface of the semi-cylindrical conductor at the position corresponding to the connection hole. Beneficial effect: This application adopts the above technical solution, and by providing a groove, it facilitates the fixing of the first fastener.

[0011] Optionally, the connecting hole is a bolt hole, and the first fastener includes: a first bolt, a first nut, and a washer; the screwing end of the first nut or the first bolt is located in the groove.

[0012] Optionally, the transition section is a cylinder, and the diameter of the cylinder is the same as the diameter of the semi-cylindrical conductor.

[0013] Optionally, the semi-cylindrical conductor, transition section, and flat plate section are integrally manufactured copper components. Beneficial effects: This application adopts the above technical solution, which facilitates manufacturing and reduces costs.

[0014] Optionally, a copper pad is provided between the flat surface of the semi-cylindrical conductor and the flat surface of the semi-cylindrical structure.

[0015] Optionally, the wiring lug contains a compressed power cable core.

[0016] Optionally, epoxy-impregnated polyester felt is used to fill the outer surface of the termination structure for connecting the electrical penetration and the wiring lug to smoothly transition the outer surface of the termination structure for connecting the electrical penetration.

[0017] Optionally, an insulating layer is wrapped around the termination structure for connecting the electrical penetration; a polyester tape is wrapped around the insulating layer; and an integral heat-shrinkable tubing is provided outside the polyester tape and the wiring lug. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a partial three-dimensional structural diagram of an electrical penetration component in the prior art;

[0020] Figure 2 This is a three-dimensional structural diagram of the termination structure for connecting electrical penetrations provided in the embodiments of this utility model. Figure 1 ;

[0021] Figure 3 This is a three-dimensional structural diagram of the termination structure for connecting electrical penetrations provided in the embodiments of this utility model. Figure 2 ;

[0022] Figure 4 This is a cross-sectional view of the termination structure for connecting electrical penetrations provided in this embodiment of the present invention after installation.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Terminal block; 2. Semi-cylindrical conductor; 3. Transition section; 4. Flat section; 5. Terminal lug; 6. First bolt; 7. First nut; 8. Copper washer; 9. Power cable core wire; 10. Polyester felt; 11. Second bolt; 12. Second nut; 13. Heat shrink tubing; 14. Anti-loosening washer; 15. Spring washer; 16. Flat washer; 17. Wrapping layer. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] refer to Figure 1As shown, when using bolts to connect terminal 1 and the lug, the nut and washer are positioned on the curved surface, resulting in poor tightening. Furthermore, the terminal 1 of the electrical penetration is generally close to the steam generator cylinder. Due to the limited operating space for connecting the three terminals 1, the tightening effect of the fasteners is severely affected, and it is inconvenient to test the preload torque. For these reasons, this application proposes an termination structure for connecting electrical penetrations.

[0027] like Figures 2 to 4 One specific embodiment of the termination structure for connecting electrical penetrations, as shown, includes: a semi-cylindrical conductor 2, a transition section 3, and a flat plate section 4. The electrical penetration of this application is used in the electrical connection of the primary loop main helium blower in a high-temperature gas-cooled reactor and belongs to the category of medium-voltage electrical connections.

[0028] like Figure 2 and Figure 4 As shown, the flat surface of the semi-cylindrical conductor 2 is in contact with the flat surface of the semi-cylindrical structure on the terminal block 1 of the electrical penetration component, and the semi-cylindrical conductor 2 and the terminal block 1 are connected by a first fastener. One end of the transition section 3 is connected to the semi-cylindrical conductor 2. The flat plate section 4 is connected to the other end of the transition section 3; the flat surfaces of the two connector lugs 5 are in contact with the flat surfaces on both sides of the flat plate section 4, and the two connector lugs 5 and the flat plate section 4 are connected by a second fastener. Specifically, the flat plate section 4 is 52 mm long and 10 mm thick, and has an M16 bolt hole with the center of the bolt hole 26 mm from the end. The second fastener includes a second bolt 11 and a second nut 12. The second bolt 11 is M16×45 and the second nut 12 is a thin nut with an M16 specification. A spring washer 15 and a flat washer 16 are sequentially inserted under the screw end of the second bolt 11. The preload torque of the second fastener is 50 Newton-meters.

[0029] Furthermore, such as Figure 3 and Figure 4 As shown, the length of the semi-cylindrical conductor 2 is the same as the length of the straight surface of the semi-cylindrical structure, and the diameter of the semi-cylindrical conductor 2 is the same as the diameter of the semi-cylindrical structure. Specifically, the length of both the semi-cylindrical structure and the semi-cylindrical conductor 2 is 80 mm, and the diameter of both is 31.9 mm.

[0030] Furthermore, such as Figure 2 and Figure 4As shown, connection holes are provided on both the arc-shaped surface of the semi-cylindrical conductor 2 and the terminal 1; a groove is provided on the arc-shaped surface of the semi-cylindrical conductor 2 at the position corresponding to the connection hole. Specifically, the connection hole is a bolt hole, and the first fastener includes: a first bolt 6, a first nut 7, and a washer; the screwing end of the first nut 7 or the first bolt 6 is located in the groove. Specifically, there are two bolt holes spaced apart along the length of the semi-cylindrical conductor 2, with the center of the end bolt holes 17 mm from the boundary, and the distance between the two bolt holes is 44 mm. Figure 4 As shown, the screw-in end of the first bolt 6 is located within the groove. The first bolt 6 is M12×35, and the first nut 7 is a thin nut with an M12 specification. An anti-loosening washer 14, with a TL12 specification, is provided under the screw-in end of the first bolt 6. The preload torque of the first fastener is 25 Newton-meters.

[0031] Specifically, the transition section 3 is a cylinder, and the diameter of the cylinder is the same as the diameter of the semi-cylindrical conductor 2. Specifically, the diameter of the cylinder is also 31.9 mm, and the length can be 48 mm.

[0032] Furthermore, such as Figure 2 and Figure 3 As shown, the semi-cylindrical conductor 2, transition section 3, and flat plate section 4 are integrally manufactured copper components. Specifically, the termination structure for connecting electrical penetration components described in this application can be formed by integrally cutting and drilling a copper cylinder with a diameter of 31.9 mm.

[0033] like Figure 4As shown, a copper gasket 8 is provided between the flat surface of the semi-cylindrical conductor 2 and the flat surface of the semi-cylindrical structure. A power cable core 9 in a compressed state is fitted inside the connector lug 5; the cross-sectional area of ​​the power cable core 9 is 120 square millimeters, and it can be compressed using a cold-pressing tool. Epoxy-impregnated polyester felt 10 is used to fill the outer surface of the termination structure for connecting the electrical penetration and the connector lug 5 to smoothly transition the outer surface of the termination structure for connecting the electrical penetration. An insulating layer is wrapped around the termination structure for connecting the electrical penetration; specifically, a first insulating layer is first wrapped around the termination structure for connecting the electrical penetration. The first insulating layer can be made of 0.5×25 silicone rubber self-adhesive tape, which can be half-overlapped eight times, and in areas with unevenness, more than eight layers can be half-overlapped; then a second insulating layer is wrapped around the first insulating layer, which can be made of 0.22×25 silicone rubber self-adhesive tape; the silicone rubber self-adhesive tape is made of pure silicone. A polyester tape is wrapped around the second insulation layer. Specifically, a 0.1×25mm ET100 polyester tape can be half-overlapped and then coated with epoxy adhesive and cured for two hours. The insulation layer and the wrapped polyester tape constitute the wrapping layer 17. A heat-shrinkable tube 13 is provided over the polyester tape and the connector lug 5. Specifically, the 500mm long heat-shrinkable tube 13 can be first fitted onto the rear end of the two power cable cores 9 on each connector lug 5, and then after wrapping the polyester tape, the heat-shrinkable tube 13 is pushed to the position outside the polyester tape and the connector lug 5 for overall heat shrinking.

[0034] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A termination structure for connecting electrical penetrations, characterized in that, include: The semi-cylindrical conductor (2) has a flat surface that is in contact with the flat surface of the semi-cylindrical structure on the terminal (1) of the electrical penetrating component, and the semi-cylindrical conductor (2) and the terminal (1) are connected by a first fastener. The transition section (3) is connected at one end to the semi-cylindrical conductor (2); The flat section (4) is connected to the other end of the transition section (3); the flat surfaces of the two wiring lugs (5) respectively fit and contact the flat surfaces provided on both sides of the flat section (4), and the two wiring lugs (5) and the flat section (4) are connected by the second fastener.

2. The termination structure for connecting electrical penetrations according to claim 1, characterized in that, The length of the semi-cylindrical conductor (2) is the same as the length of the straight surface of the semi-cylindrical structure, and the diameter of the semi-cylindrical conductor (2) is the same as the diameter of the semi-cylindrical structure.

3. The termination structure for connecting electrical penetrations according to claim 1, characterized in that, Connection holes are provided on the arc-shaped surface of the semi-cylindrical conductor (2) and on the terminal (1); a groove is provided on the arc-shaped surface of the semi-cylindrical conductor (2) at the position corresponding to the connection hole.

4. The termination structure for connecting electrical penetrations according to claim 3, characterized in that, The connecting hole is a bolt hole, and the first fastener includes: a first bolt (6), a first nut (7) and a washer; the screwing end of the first nut (7) or the first bolt (6) is located in the groove.

5. The termination structure for connecting electrical penetrations according to any one of claims 1-4, characterized in that, The transition section (3) is a cylinder, and the diameter of the cylinder is the same as the diameter of the semi-cylindrical conductor (2).

6. The termination structure for connecting electrical penetrations according to any one of claims 1-4, characterized in that, The semi-cylindrical conductor (2), transition section (3) and flat plate section (4) are copper parts made as a single unit.

7. The termination structure for connecting electrical penetrations according to claim 6, characterized in that, A copper pad (8) is provided between the flat surface of the semi-cylindrical conductor (2) and the flat surface of the semi-cylindrical structure.

8. The termination structure for connecting electrical penetrations according to any one of claims 1-4, characterized in that, The wiring lug (5) contains a compressed power cable core wire (9).

9. The termination structure for connecting electrical penetrations according to any one of claims 1-4, characterized in that, The outer surface of the termination structure for connecting the electrical penetration and the wiring lug (5) is filled with epoxy-impregnated polyester felt (10) to smoothly transition the outer surface of the termination structure for connecting the electrical penetration.

10. The termination structure for connecting electrical penetrations according to claim 9, characterized in that, An insulating layer is wrapped around the termination structure for connecting electrical penetrations; a polyester tape is wrapped around the insulating layer; and an integral heat-shrinkable tube (13) is provided over the polyester tape and the wiring lug (5).

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