CN203799766U - +/- 660kV direct-current composite insulator - Google Patents

Abstract

The utility model discloses a +/- 660kV direct-current composite insulator comprising an annular metal connection piece located on the end portion, a seal ring, an epoxy resin glass fiber rod, a sheath and grading rings. The annular metal connection piece is connected with the grading ring at the ground end. The grading ring at the ground end is connected with the front end of the epoxy resin glass fiber rod through the seal ring. The outer surface of the epoxy resin glass fiber rod is coated with a sheath. The sheath is provided with umbrella skirts of three specifications. The tail end of the epoxy resin glass fiber rod is connected with the grading ring at the high-voltage end. According to the utility model, the structural form in which patterned extra large umbrellas are provided and one large umbrella and two umbrellas are combined is adopted, the creepage distance can be effectively increased on the basis of the original structural height, the electric field distribution on the surface of the +/-660kV direct-current insulator can be improved, the local field strength can be reduced, the occurrence of partial discharge can be restrained, and at the same time, the structure can be used to block the snow and ice bridge connection, so the advantage of good snow and ice flash prevention capability can be realized.

Description

A ±660kV DC Composite Insulator

technical field

The utility model relates to the field of overhead transmission lines, in particular to a ±660kV DC composite insulator.

Background technique

As an important part of transmission lines, insulators play an important role in ensuring the safe operation of power systems. Composite insulators not only have hydrophobic performance, hydrophobic migration performance, small equivalent diameter and good anti-pollution flashover performance, but also have the characteristics of high strength, light weight, unbreakable, convenient transportation, easy operation and maintenance, etc. It is widely used in transmission lines, and it has also begun to be used in batches or even in new AC and DC projects with a voltage level of 500kV and above. However, due to the zero-crossing problem of DC, the DC pollution flashover characteristics of composite insulators are very different from the AC pollution flashover characteristics. At the same time, due to the electrostatic adsorption of DC voltage, the pollution on the DC outer insulation surface is faster and dirtier under the same conditions. Seriously, the test conclusions of AC composite insulators should not be directly applied to the design of composite insulators for DC transmission lines. The ±660kV DC composite insulators that have been put into operation adopt the structure of large-small-small umbrellas, and different degrees of partial discharge have occurred , which seriously threatens the operation safety of ±660kV DC transmission lines.

Utility model content

In order to solve the above problems, the utility model proposes a ±660kV DC composite insulator, which can effectively increase the creepage distance, has the ability to prevent ice and snow flashover, and effectively solves the partial discharge problem of the ±660kV DC composite insulator.

In order to achieve the above object, the utility model adopts the following technical solutions:

A ±660kV DC composite insulator, including an annular metal connector at the end, a sealing ring, an epoxy resin glass fiber rod, a sheath, and a grading ring; wherein, the annular metal connector is connected to the grading ring of the grounding end, and the grading ring of the grounding end The pressure equalizing ring is connected to the front end of the epoxy resin fiberglass rod through the sealing ring. The outer surface of the epoxy resin fiberglass rod is covered with a sheath. Connect the grading ring on the high pressure side.

The umbrella skirts include three specifications: extra large umbrella skirts, large umbrella skirts and small umbrella skirts, wherein the diameter of the extra large umbrella skirts is 290-310mm, the diameter of the large umbrella skirts is 215-225mm, and the diameter of the small umbrella skirts is 150-160mm;

The shed structure is in the form of 1 large and 2 small umbrellas with extra large flower arrangements, and the space between the large and small umbrellas is in the form of large-small-small. The distance between adjacent sheds is 30-38mm, and the distance between adjacent large sheds is 650- 660mm.

The umbrella skirt is formed by extruding and wearing umbrellas for easy adjustment of the position of the extra-large umbrella.

The beneficial effects of the utility model are: adopting the structure form of 1 large umbrella and 2 small umbrellas with flower-arranged extra-large umbrellas, the creepage distance can be effectively increased on the basis of the original structure height, the electric field distribution on the surface of ±660kV DC insulators can be improved, and the The local field strength can suppress the occurrence of partial discharge, and at the same time, the structure can block the bridging of ice and snow, and has a good ability to prevent ice and snow flash.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Among them, 1 annular metal connector, 2 sealing ring, 3 pressure equalizing ring at grounding end, 4 sheath mandrel, 5 extra large umbrella, 6 large umbrella, 7 small umbrella, 8 pressure equalizing ring at high voltage end.

Detailed ways:

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Fig. 1, the preferred embodiment of the utility model, the ±660kV composite insulator with a nominal structural height of 9200mm is now listed to further describe the utility model in conjunction with the accompanying drawings.

According to Figure 1, a ±660kV DC composite insulator includes an annular metal connector 1 at the end, a sealing ring 2 at the end of the mandrel, a voltage equalizing ring 3 at the grounding end, an epoxy resin glass fiber rod at the center, and a package Sheath 4 covering its surface, several extra-large sheds 5 on the surface of the sheath, several large sheds 6 on the surface of the sheath, several small sheds 7 on the surface of the sheath, and a small equalizing ring 8 at the high-voltage end; the ring at the end The metal connector 1 is hot-dip galvanized; the pressure equalizing ring at the grounding end and the high voltage end pressure equalizing ring are made of aluminum alloy; the number of extra-large sheds is 13, the number of large sheds is 94, and the number of small sheds is 214. It is in the form of 1 large and 2 small with extra-large umbrellas for flower arrangement, and the size of the umbrellas is in the form of large-small-small. The original composite insulator has 107 large umbrellas, and now 13 extra-large umbrellas and 94 large umbrellas are used to convert the original insulator from the cross-arm The 1st, 9th, 17th, 25th, 33rd, 41st, 49th, 57th, 65th, 73rd, 81st, 89th, and 97th big umbrellas are changed to extra-large umbrellas, and the position and quantity of small umbrellas remain unchanged; the umbrella skirts are packed Umbrella molding, the position of the oversized umbrella skirt can be flexibly adjusted according to actual needs. The diameter of the extra large umbrella skirt is 300mm, the diameter of the large umbrella skirt is 220mm, and the diameter of the small umbrella skirt is 154mm. The structure of the sheds is 1 large and 2 small with extra-large flower-arranged umbrellas. The space between the big and small umbrellas is large-small-small. The distance between adjacent sheds is 34mm, and the distance between adjacent super-large sheds is 653mm.

The use of extra-large umbrellas increases the creepage distance of the ±660kV DC composite insulator from the original 38400mm to 40400mm, improves the electric field distribution on the surface of the ±660kV DC insulator, reduces the local field strength, suppresses the occurrence of partial discharge, and improves the insulator The pollution flashover voltage reduces the probability of pollution flashover.

The diameter of the mandrel and the rated mechanical load should be determined according to the actual use, and the mandrel should pass the power frequency withstand voltage test and other screening tests.

Although the specific implementation of the utility model has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the utility model. Those skilled in the art should understand that on the basis of the technical solution of the utility model, those skilled in the art do not need to Various modifications or deformations that can be made with creative efforts are still within the protection scope of the present utility model.

Claims (4)

1. ± 660kV DC compound insulator, is characterized in that: comprise the endless metal connector, sealing ring, epoxy resin fiberglass rod, sheath and the grading ring that are positioned at end; Wherein, endless metal connector connects the grading ring of earth terminal, the grading ring of earth terminal is by the front end of sealing ring connecting ring epoxy resins Fiber glass rod, epoxy resin fiberglass rod outer surface is coated with sheath, sheath is provided with the full skirt of three kinds of specifications, and the tail end of epoxy resin fiberglass rod connects the grading ring of high-pressure side.

2. one ± 660kV DC compound insulator as claimed in claim 1, it is characterized in that: described full skirt comprises especially big full skirt, large full skirt and three kinds of specifications of little full skirt, and wherein, especially big full skirt diameter is 290-310mm, large full skirt diameter is 215-225mm, and umbellule skirt diameter is 150-160mm.

3. one ± 660kV DC compound insulator as claimed in claim 1, it is characterized in that: described umbrella skirt construction is 1 large 2 little forms of the especially big umbrella of band flower arrangement, between large umbellule, be large-little-little form, the spacing of adjacent full skirt is 30-38mm, and the spacing of adjacent especially big full skirt is 650-660mm.

4. one ± 660kV DC compound insulator as claimed in claim 1, is characterized in that: described full skirt is the squeezing bag penetrating umbrella moulding that is easy to the position of adjusting especially big umbrella.