CN204066908U - A kind of insulated compound sleeve pipe - Google Patents

Abstract

The utility model relates to an insulating composite casing, which comprises a glass steel pipe whose axis extends in the up-and-down direction. A central conductor is set in the inner hole of the glass steel pipe. The flange is provided with a connecting terminal electrically connected to the central conductor. The glass steel pipe includes a glass fiber reinforced plastic cone section and a glass fiber reinforced plastic straight section arranged up and down. The diameter of the glass fiber reinforced plastic cone section gradually increases from top to bottom. The hole is provided with a shielding cover sleeved on the periphery of the central conductor, and the shielding cover is fixed on the lower connecting flange. The utility model provides an insulating composite bushing which is light in weight and can reduce the required distance between two adjacent insulating composite bushings and the filling amount of SF6.

Description

An insulating composite casing

technical field

The utility model relates to an insulating composite bushing used in high-voltage power transmission equipment. the

Background technique

Each phase of the high-voltage transmission equipment needs to be connected with the overhead line with a composite bushing. The existing insulating composite bushing is "a 550kV low-pressure SF6 gas-insulated composite bushing" disclosed in Chinese patent CN203013426U. The insulating composite bushing It includes the fiberglass casing with the axis extending in the up and down direction and the central conductor pierced in the inner hole of the fiberglass casing. The fiberglass casing is a cylindrical straight casing. The upper connecting flange is fixed with a pressure equalizing ring and the terminal electrically connected to the central conductor, the glass fiber reinforced plastic sleeve is covered with an umbrella sheath, and the lower connecting flange is fixed with a sleeve set around the lower end of the central conductor. shielding cover. The existing problem of this kind of insulating composite bushing is that: the insulating composite bushing is a cylindrical straight bushing, which makes the insulating composite bushing heavy in weight, large in volume, and high in production cost; in addition, because the insulating composite bushing is Cylindrical straight bushing, which will increase the radial dimension of the pressure equalizing ring, and also cause the distance between the upper connecting flanges between the phases to be small. In order to ensure the phase-to-phase distance, it is necessary to make two adjacent insulating There is enough space between the bushings, which will cause the entire high-voltage power transmission equipment to occupy a large space; there is also the need to fill SF6 gas inside the FRP bushing during use, and the cylindrical straight bushing structure makes the space inside the FRP bushing Larger, more SF6 gas needs to be filled, and the filling cost is high. the

Contents of the invention

The purpose of the utility model is to provide an insulating composite bushing which is light in weight and can reduce the required distance between two adjacent insulating composite bushings and the filling amount of SF6. the

In order to solve the above problems, the technical solution of the utility model is:

An insulating composite bushing, comprising a glass steel pipe whose axis extends in the up and down direction, a central conductor is pierced in the inner hole of the glass steel pipe, upper and lower connecting flanges are respectively arranged at the upper and lower ends of the glass steel pipe, and the upper connecting flange is provided with There is a connecting terminal electrically connected to the central conductor. The glass steel pipe includes a glass fiber reinforced plastic cone section and a glass fiber reinforced plastic straight section arranged up and down. The diameter of the glass fiber reinforced plastic cone section gradually increases from top to bottom. The shielding cover is sleeved on the periphery of the central conductor, and the shielding cover is fixed on the lower connecting flange.

The shielding cover includes a shielding cover cone section and a shielding cover straight section arranged up and down, and the diameter of the shielding cover cone section gradually increases from top to bottom. the

A pressure equalizing ring sheathed on the periphery of the connection terminal is fixed on the upper connecting flange. the

The insulating composite casing also includes a shed sheath sheathed on the periphery of the FRP cone section and the FRP straight section, and the shed sheath is integrally injection-molded from silicon rubber material. the

The FRP pipe also includes a straight part arranged on the upper end of the FRP cone section. The upper connecting flange includes a flange plate provided with bolt holes and a connecting sleeve fixed on the lower end of the flange plate. The connecting sleeve is fixedly sleeved on the On the periphery of the straight part, the connection terminal is fixed on the flange. the

The beneficial effects of the utility model are as follows: the glass steel pipe in the utility model includes a glass fiber reinforced plastic cone section and a glass fiber reinforced plastic straight section arranged up and down, and the setting of the glass fiber reinforced plastic cone section makes the diameter of the upper end of the glass steel gradually shrink, so that on the one hand, the fiberglass steel tube can be lightened. Weight, reduce the inner hole volume of the glass steel pipe to reduce the filling amount required for SF6, and the upper connecting flange electrically connected to the terminal can be appropriately made smaller, and the gap between two adjacent insulating composite sleeves in use The distance between the upper connecting flanges will become larger, and the required distance between two adjacent insulating composite bushings can also be appropriately reduced, thereby helping to reduce the occupied space of the entire high-voltage power transmission equipment; The diameter of the straight section is relatively large, and the shielding cover arranged in the straight section of FRP can ensure a sufficient distance from the central conductor, thereby ensuring the shielding effect. the

Description of drawings

Fig. 1 is the structural representation of an embodiment of the present utility model;

Fig. 2 is a sectional view of Fig. 1;

Fig. 3 is a schematic diagram of the cooperation of the terminal block, the upper connecting flange, the pressure equalizing ring and the glass steel pipe in Fig. 1;

Fig. 4 is a schematic diagram of cooperation of the lower connecting flange, the shielding cover and the glass steel pipe in Fig. 1 . the

Detailed ways

An embodiment of an insulating composite casing is shown in Figures 1 to 4: it includes a glass steel pipe whose axis extends in the up and down direction, a central conductor 5 is pierced in the inner hole of the glass steel pipe, and the central conductor is a conductive rod, and the upper and lower sides of the glass steel pipe An upper connection flange 1 and a lower connection flange 8 are respectively provided at the ends, and the upper connection flange 1 is provided with a connection terminal 2 electrically connected to the central conductor 5 . The FRP pipe includes a straight part 10, a FRP cone section 4 and a FRP straight section 6 arranged up and down in sequence. The diameter of the FRP cone section 4 gradually increases from top to bottom, and the diameter of the straight part 10 is smaller than that of the FRP cone section 4. The diameter of the head end is the same, the diameter of the large end of the FRP straight section 6 and the FRP cone section 4 is the same, and the insulating composite sleeve also includes an umbrella skirt sheath 9 sleeved on the straight section, the FRP cone section, and the FRP straight section. The skirt sheath 9 is integrally injection-molded by silicone rubber material. In this embodiment, the creepage distance of the shed sheath is not less than 20630mm, the inner diameter of the straight section of glass fiber reinforced plastic is 460mm, and the inner diameter of the straight section is 167mm. The inner hole of the FRP straight section is provided with a shield 7 coaxially sleeved on the periphery of the central conductor, and the shield 7 is fixed on the lower connecting flange 8, and the shield includes a shield cone section 13 and a shielding shield set up and down. The diameters of the shield straight section 14 and the shield cone section 13 gradually increase from top to bottom. The upper connecting flange 1 includes a flange plate 11 provided with bolt holes and a connecting sleeve 12 fixed on the lower end of the flange plate 11. The connecting sleeve 12 is set on the periphery of the straight part 10, and the inner wall of the connecting sleeve 12 is provided with a connecting groove. , the connection groove and between the connection sleeve and the straight part are filled with epoxy resin body to realize the fixed connection between the connection sleeve and the straight part. The epoxy resin body is cured by liquid epoxy resin, and the terminal is fixed on the flange. , The pressure equalizing ring 3 sleeved on the periphery of the terminal is also fixed on the flange, and the pressure equalizing ring 3 is coaxially arranged with the glass steel pipe. the

After electric field calculation and optimization, under the lightning impulse voltage of 1675kV, the electric field strength of the shielding part and conductor surface is not greater than 26.6kV/mm, and the electric field strength inside the insulating part is not greater than 3kV/mm. The insulating composite bushing in the utility model can be applicable to the connection of 550kV high-voltage transmission equipment and overhead lines, for example, for 550kV GIS and circuit breaker outlet. The glass steel pipe adopts the combination of straight cylinder and cone cylinder, which can not only meet the layout requirements of the shielding cover, but also reduce the weight of the insulating composite casing, save material, assembly and transportation costs, and help reduce the occupation of high-voltage transmission equipment Space; the setting of the straight part facilitates the connection between the glass steel pipe and the upper connecting flange. the

In other embodiments of the present invention: the shielding cover can also only include the straight section of the shielding cover; the shed sheath can also be made of ceramic material; the upper connecting flange can also be fixed on the glass steel pipe by bolts; the straight section can also be It can be omitted; when the insulating composite bushing needs to be applied to high-voltage power transmission equipment of other voltage levels, the straight part, the inner diameter of the FRP straight part and the height of each part of the FRP pipe can be set as required. the

Claims (5)

1. an insulated compound sleeve pipe, comprise the glass reinforced plastic pipe that axis extends along the vertical direction, center conductor is worn in the endoporus of glass reinforced plastic pipe, the two ends up and down of glass reinforced plastic pipe are respectively arranged with, lower adpting flange, upper adpting flange is provided with the binding post be electrically connected with described center conductor, it is characterized in that: glass reinforced plastic pipe comprises fiberglass conical cylinder section setting up and down and fiberglass direct tube section, the diameter of fiberglass conical cylinder section becomes large from top to bottom gradually, the radome being sheathed on described center conductor periphery is provided with in the endoporus of fiberglass direct tube section, radome is fixedly arranged on described lower adpting flange.

2. insulated compound sleeve pipe according to claim 1, is characterized in that: described radome comprises radome conical cylinder section setting up and down and radome direct tube section, and the diameter of radome conical cylinder section becomes large from top to bottom gradually.

3. insulated compound sleeve pipe according to claim 1, is characterized in that: described upper adpting flange is installed with the grading ring being sheathed on binding post periphery.

4. insulated compound sleeve pipe according to claim 1, is characterized in that: insulated compound sleeve pipe also comprises the umbrella sheath being sheathed on fiberglass conical cylinder section and fiberglass direct tube section periphery, and described umbrella sheath is by silastic material integrated injection molding.

5. the insulated compound sleeve pipe according to claim 1 ~ 4 any one, it is characterized in that: glass reinforced plastic pipe also comprises the straight drum part being arranged at fiberglass conical cylinder section upper end, described upper adpting flange comprises the ring flange being provided with bolt penetration hole and the adapter sleeve being fixedly arranged on ring flange lower end, it is peripheral that described adapter sleeve fixed cover is located at described straight drum part, and described binding post is fixedly arranged on described ring flange.