CN211907118U

CN211907118U - Conjoined insulator

Info

Publication number: CN211907118U
Application number: CN202020985569.9U
Authority: CN
Inventors: 张云根; 郑君; 熊小利
Original assignee: Zhejiang Roxz Electric Co ltd
Current assignee: Zhejiang Roxz Electric Co ltd
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2020-11-10
Anticipated expiration: 2030-06-02

Abstract

The utility model provides a disjunctor insulator belongs to insulating technical field. The method solves the problems of insufficient safety and low local discharge amount caused by gap discharge. The conjoined insulator comprises a columnar insulator and an insulating cover fixedly connected with the insulator, wherein one end of the insulator extends into the insulating cover, a first connecting hole is formed in the center of the end face of the insulator, a first metal insert with an internal thread is fixed in the first connecting hole, a plurality of second connecting holes are formed in the other end face of the insulator, a second metal insert with an internal thread is fixed in each second connecting hole, a plurality of annular creepage sheds are arranged outside the insulator along the axial direction, the insulator and the insulating cover are of an integrated structure, and a plurality of high-voltage wires for conducting the two metal inserts are arranged in the insulator. The conjoined insulator has the advantages of ensuring the partial discharge characteristic, improving the safety and the like.

Description

Conjoined insulator

Technical Field

The utility model belongs to the technical field of it is insulating, relate to disjunctor insulator.

Background

The PT handcart is used for a movable switch cabinet or a middle-set switch cabinet, components such as PT, a capacitor, isolation and the like are assembled on a movable frame, and the PT handcart is pushed to enter the cabinet body by virtue of a guide rail in the cabinet body so as to realize protection and control functions. The insulator is an important element on the PT handcart, is an insulated main body of a power transmission line and needs to bear the action of working voltage and overvoltage. The insulator basically comprises an insulator and an insulating cover, wherein metal inserts with internal threads are respectively arranged at two ends of the insulator, and the metal inserts at the two ends can be respectively connected with a frame and an insulating contact arm. During manufacturing, the metal insert is placed in a mold, then liquid insulating material such as epoxy resin is poured into the mold, and after cooling, the insulator with the metal insert inside is directly formed. The insulator can not guarantee that the metal inserts are completely wrapped, namely, a joint surface is cracked or gapped, so that gap discharge often occurs between the metal inserts, the partial discharge characteristic of the insulator is unqualified, and the insulation performance is affected to reduce the safety.

Disclosure of Invention

The utility model aims at the above-mentioned problem that prior art exists, provide disjunctor insulator, solved because of the clearance discharges and lead to the problem that the security is not enough, the partial discharge volume is low.

The purpose of the utility model can be realized by the following technical proposal:

the conjoined insulator comprises a columnar insulator and an insulating cover fixedly connected with the insulator, wherein one end of the insulator extends into the insulating cover, a first connecting hole is formed in the center of the end face of the insulator, a first metal insert with internal threads is fixed in the first connecting hole, a plurality of second connecting holes are formed in the other end face of the insulator, a second metal insert with internal threads is fixed in each second connecting hole, and a plurality of annular creepage sheds are axially arranged outside the insulator.

When the integrated insulator and the insulating cover are manufactured, the metal inserts II are connected by the high-voltage lead to form conduction, then the metal inserts I and the metal inserts II which are formed to be conducted through the high-voltage lead are placed into a mold, finally epoxy resin liquid is poured into the mold, the insulator and the insulating cover which are of an integrated structure can be directly formed after cooling, and meanwhile, the metal inserts I and the metal inserts II are fixed in the insulator. Because the two metal inserts are connected through the high-voltage lead to form conduction, gap discharge generated between the two metal inserts is eliminated, the local discharge characteristic is ensured, and the safety is improved.

In the conjoined insulator, the number of the metal inserts is four, the number of the high-voltage wires is two, one high-voltage wire conducts the two metal inserts, the other high-voltage wire conducts the rest two metal inserts, the two high-voltage wires are crossed to form conduction, and the two high-voltage wires form two diagonals of a square.

The two high-voltage wires are respectively connected with the two second metal inserts to form conduction, and then the two high-voltage wires are crossed to form conduction, so that the four second metal inserts can form conduction through the two high-voltage wires.

In the integral insulator, as another technical scheme, the number of the metal inserts two is four, the number of the high-voltage wires is four, one high-voltage wire is connected between two adjacent metal inserts two, and the four high-voltage wires form four sides of a square.

In the conjoined insulator, the two ends of the high-voltage wire are respectively provided with a metal connecting sheet, and the high-voltage wire and the metal insert are fixed by screws which penetrate through the connecting sheets and into the two side parts of the metal insert.

In the conjoined insulator, the metal connecting sheet is an arc-shaped sheet and is attached to the outer wall of the metal insert II.

In the conjoined insulator, two adjacent creepage sheds are transited through an inwards concave circular arc, and the insulating cover and the adjacent creepage sheds are transited through an inwards concave circular arc. The arc transition of indent can increase creepage distance, further improves the security.

In the above conjoined insulator, the outer diameter of the end of the insulator provided with the connecting hole II is larger than that of the end of the insulator provided with the connecting hole I.

In the above connected insulator, two end faces of the insulator are parallel.

Compared with the prior art, the integral insulator has the advantages that the insulator and the insulator are arranged into an integral structure, and the four second metal inserts are connected and conducted by the high-voltage lead, so that gap discharge generated between the two metal inserts is eliminated, the local discharge characteristic is ensured, and the safety is improved. In addition, the transition is formed between two adjacent creepage sheds and between the insulating cover and the adjacent creepage sheds by utilizing the concave circular arc, the creepage distance is increased, and the safety is further improved.

Drawings

Fig. 1 is a schematic view of the present conjoined insulator.

Fig. 2 is a sectional view of the present integral insulator.

FIG. 3 is a schematic view of an end face of the integral insulator provided with a second connecting hole.

In the figure, 1, an insulator; 1a, connecting a hole I; 1b, connecting holes II; 1c, climbing an umbrella skirt; 2. an insulating cover; 3. a first metal insert; 4. a second metal insert; 5. a high voltage wire.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1-3, the conjoined insulator includes a columnar insulator 1 and an insulating cover 2 fixedly connected to the insulator 1, wherein the insulator 1 and the insulating cover 2 are of an integrated structure and made of epoxy resin material. The two end surfaces of the insulator 1 are parallel, a plurality of annular creepage sheds 1c are axially arranged outside the insulator 1, two adjacent creepage sheds 1c are in transition through an inwards concave circular arc, and the insulating cover 2 and the adjacent creepage sheds 1c are in transition through an inwards concave circular arc. One end of the insulator 1 extends into the insulating cover 2, a connecting hole I1 a is formed in the center of the end face of the insulator 1, and a metal insert I3 with internal threads is fixedly connected into the connecting hole I1 a. The other end face of the insulator 1 is provided with a plurality of connecting holes II 1b, and a metal insert II 4 with internal threads is fixedly connected in each connecting hole II 1 b. The outer diameter of the end of the insulator 1 provided with the connecting hole II 1b is larger than that of the end of the insulator 1 provided with the connecting hole I1 a.

As shown in fig. 3, specifically, the insulator 1 has a plurality of high-voltage wires 5 for conducting two 4 metal inserts, the number of the two metal inserts 4 is four, the number of the high-voltage wires 5 is two, one high-voltage wire 5 conducts two metal inserts 4, the other high-voltage wire 5 conducts the remaining two metal inserts 4, the two high-voltage wires 5 are crossed to form conduction, and the two high-voltage wires 5 form two diagonal lines of a square. And two ends of the high-voltage lead 5 are respectively provided with a metal connecting sheet, and the high-voltage lead and the second metal insert 4 are fixed by screws which penetrate through the connecting sheets and into the side parts of the second metal insert 4. The metal connecting sheet is an arc-shaped sheet and is attached to the outer wall of the second metal insert 4.

Example two

The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in this embodiment, the number of the second metal inserts 4 is four, the number of the high-voltage wires 5 is four, one high-voltage wire 5 is connected between two adjacent second metal inserts 4, and the four high-voltage wires 5 form four sides of a square.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The conjoined insulator comprises a columnar insulator (1) and an insulating cover (2) fixedly connected with the insulator (1), wherein one end of the insulator (1) extends into the insulating cover (2) and is provided with a first connecting hole (1a) in the center of the end face of the insulator (1), a first metal insert (3) with an internal thread is fixed in the first connecting hole (1a), the other end face of the insulator (1) is provided with a plurality of second connecting holes (1b), a second metal insert (4) with an internal thread is fixed in each second connecting hole (1b), and a plurality of annular creepage sheds (1c) are axially arranged outside the insulator (1).

2. The one-piece insulator according to claim 1, wherein the number of the second metal inserts (4) is four, the number of the high-voltage wires (5) is two, one high-voltage wire (5) conducts the two second metal inserts (4), the other high-voltage wire (5) conducts the remaining two second metal inserts (4), the two high-voltage wires (5) are crossed to form conduction, and the two high-voltage wires (5) form two diagonals of a square.

3. The one-piece insulator according to claim 1, wherein the number of the second metal inserts (4) is four, the number of the high-voltage wires (5) is four, one high-voltage wire (5) is connected between two adjacent second metal inserts (4), and the four high-voltage wires (5) form four sides of a square.

4. The conjoined insulator according to claim 1, 2 or 3, wherein the two ends of the high voltage lead (5) are respectively provided with a metal connecting sheet, and the high voltage lead (5) and the second metal insert (4) are fixed by a screw which passes through the connecting sheets and penetrates into the side part of the second metal insert (4).

5. The one-piece insulator according to claim 4, wherein the metal connecting piece is an arc-shaped piece and is attached to the outer wall of the second metal insert (4).

6. The conjoined insulator according to claim 1, wherein the two adjacent creepage sheds (1c) are transited through an inward concave arc, and the insulating cover (2) and the adjacent creepage sheds (1c) are transited through an inward concave arc.

7. The conjoined insulator according to claim 1, wherein the outer diameter of the end of the insulator (1) provided with the connecting hole II (1b) is larger than the outer diameter of the end of the insulator (1) provided with the connecting hole I (1 a).

8. The conjoined insulator according to claim 7, wherein two end faces of the insulator (1) are parallel.