CN204668903U - A kind of 110kV cable intermediate joint - Google Patents

Abstract

The utility model relates to a 110kV cable intermediate joint, comprising a connecting pipe, a pressure equalizing sleeve outside the connecting pipe, an integral prefabricated rubber insulating part outside the pressure equalizing sleeve, a copper protective shell outside the integral prefabricated rubber insulating part, and a copper protective shell filled in The insulating glue between the integral prefabricated rubber insulating parts, the grounding connection pipe and the grounding post integrated on the outside of the copper protective shell, the copper protective shell is an integral structure, and the outer surface of the copper protective shell is covered with PP with a thickness of 6mm The insulating material layer is covered with a layer of heat-shrinkable insulating tube inside the copper protective shell. A large number of long-term water immersion tests show that compared with the existing products, the 110kV intermediate joint of the utility model has better waterproof sealing performance and corrosion resistance, and can fully meet the long-term requirements without installing a glass fiber reinforced plastic outer protective case. Requirements for safe and stable operation in water-immersed environments.

Description

A 110kV Cable Intermediate Joint

technical field

The utility model belongs to the technical field of power cables, in particular to a 110kV cable intermediate joint.

Background technique

The current structure of the 110kV intermediate joint is shown in Figure 1. It is mainly composed of connecting pipe 7, pressure equalizing sleeve 8, integral prefabricated rubber insulating part 9, copper protective shell 5, epoxy insulating ring 6, insulating glue in the copper protective shell 4, grounding Composed of terminal 3, grounding terminal 2 and wrapping seal 1. On the one hand, the copper protective shell plays the role of electrical connection, connecting the metal sheaths of the two ends of the cable; on the other hand, it mainly undertakes the role of mechanical protection, sealing and waterproof protection, ensuring that the internal joint body is not affected by the outside world. The epoxy insulating ring in the current product The copper protective shell needs to be assembled on site. Sometimes due to the negligence of the installer, the insulating glue in the copper protective shell is not fully filled, resulting in a decline in the impact voltage withstand performance of the copper shells at both ends of the epoxy insulating ring. At the same time, the outer surface of the copper protective shell is also covered with a layer of epoxy resin insulating material to ensure the insulation and isolation of the copper protective shell from the outside world. In actual use, if it is necessary to meet the requirements of safe and stable operation in a long-term submerged environment, it is necessary to install an outer protective shell outside the intermediate joint and pour insulating and waterproof sealant in the shell. This solution not only increases the cost, but also because The waterproof sealant is usually a two-component glue, which needs to be stirred on site before it can be poured into the outer protective shell and cured. The process will inevitably cause environmental pollution. In addition, due to the large volume of the protective shell, the space of the cable tunnel (or cable trench) occupied by the intermediate joint is virtually increased. Due to the limited installation space in cable tunnels, cable trenches and joint wells, it is necessary to optimize and improve the structure of existing 110kV intermediate joint products to fully meet market requirements.

Contents of the invention

The purpose of the utility model is to propose a 110kV cable intermediate joint aiming at the deficiencies of the prior art.

The utility model solves its technical problem and realizes by taking the following technical solutions:

A 110kV cable intermediate joint, including a connecting pipe connecting the cables at both ends, a pressure equalizing sleeve outside the connecting pipe, an integral prefabricated rubber insulating part covering the external pressure equalizing sleeve, a copper protective shell wrapped outside the integral prefabricated rubber insulating part, Insulating glue filled between the copper protective shell and the integral prefabricated rubber insulating part, two grounding pipes integrally made outside the copper protective shell and grounding posts installed inside the grounding pipe, the copper protective shell is an integral structure , the outer surface of the copper protective shell is covered with a PP insulating material layer with a thickness of 6mm, and a layer of heat-shrinkable insulating tube is covered on the inner side of the copper protective shell.

Moreover, the two ground connecting pipes are arranged on one side of the copper protective shell, and the two ground connecting pipes form an included angle of 60° with each other.

Moreover, the grounding post is a circular grounding post structure.

Advantage and positive effect of the present utility model are:

A large number of long-term water immersion tests show that compared with the existing products, the 110kV intermediate joint of the utility model has better waterproof sealing performance and corrosion resistance, and can fully meet the long-term requirements without installing a glass fiber reinforced plastic outer protective shell. Requirements for safe and stable operation in water-immersed environments.

Description of drawings

Figure 1 is a schematic diagram of the structure of the current 110kV intermediate joint;

Fig. 2 is the structural representation of the 110kV intermediate joint of the utility model;

Fig. 3 is a structural schematic diagram of two ground connecting pipes in the utility model.

Detailed ways

The implementation of the utility model will be described in further detail below in conjunction with the accompanying drawings. The following examples are only descriptive, not restrictive, and cannot limit the protection scope of the utility model.

A 110kV cable intermediate joint, as shown in Figure 2, includes a connecting pipe 6 connecting the cables at both ends, a pressure equalizing sleeve 7 outside the connecting pipe, an integral prefabricated rubber insulating part 5 covering the external pressure equalizing sleeve, wrapped in the overall prefabricated Copper protective shell 4 outside the rubber insulating part, insulating glue 3 filled between the copper protective shell and the overall prefabricated rubber insulating part, two grounding connecting pipes 1 made integrally on the outside of the copper protective shell and installed inside the grounding connecting pipe The grounding column 2 of the utility model is that the innovation of the utility model is that the copper protective shell has an integrated structure, which improves the performance of withstanding impact voltage, and the surface of the copper protective shell is covered with a PP insulating material layer 9 with a thickness of 6mm, which enhances the overall Waterproof performance, the inner side of the copper protective shell is covered with a layer of heat-shrinkable insulating tube 8 for isolation, which effectively enhances the insulation and sealing waterproof performance of the cable intermediate joint.

In the specific implementation of the utility model, as shown in Figure 3, the two ground connecting pipes are placed on one side of the copper protective shell, and the two ground connecting pipes form an angle of 60° with each other, which brings space for the installation. convenient.

In the specific implementation of the utility model, the grounding column is changed from the original square grounding block structure to a circular grounding column structure, so as to facilitate the subsequent wrapping and sealing process.

Claims (3)

1. A 110kV cable intermediate joint, including a connecting pipe connecting the cables at both ends, a pressure equalizing sleeve outside the connecting pipe, an integral prefabricated rubber insulating part covering the external pressure equalizing sleeve, and a copper protection wrapped outside the integral prefabricated rubber insulating part The shell, the insulating glue filled between the copper protective shell and the integral prefabricated rubber insulating part, the two grounding pipes integrally produced outside the copper protective shell and the grounding column installed inside the grounding pipe are characterized in that: The copper protective shell has an integrated structure, and the outer surface of the copper protective shell is covered with a PP insulating material layer with a thickness of 6mm, and a layer of heat-shrinkable insulating tube is covered inside the copper protective shell. 2. The 110kV cable intermediate joint according to claim 1, characterized in that: the two grounding pipes are arranged on one side of the copper protective shell, and the two grounding pipes form an included angle of 60° with each other. 3. The 110kV cable intermediate joint according to claim 1, wherein the grounding post is a circular grounding post structure.