CN208093966U - A kind of air insulation switchgear cable cell structure - Google Patents

Abstract

A cable room structure for an air-insulated switchgear, comprising a cabinet body and a cable room separately provided for the cabinet body, a busbar is arranged in the cable room, an air-insulated switchgear and a current transformer are also arranged in the cabinet body, and the busbar One contact is provided at both ends to connect the air-insulated switchgear and the current transformer respectively; the busbar is bent from the middle at least one place, and forms more than two sub-sections, the contact and the busbar, Flexible joints are rotatably connected between each sub-section of the busbar; the beneficial effects of the utility model are: the utility model meets the national standard of 40.5kV high-current cabinet phase-to-phase and the relative air clearance distance of 300mm and the countermeasure requirements of the power grid company, The interphase barrier can be eliminated, the electric field can be homogenized, and the insulation performance and breakdown voltage can be improved.

Description

A cable room structure for an air-insulated switchgear

technical field

The utility model patent is applicable to an air-insulated switchgear, and in particular relates to a cable room structure of an air-insulated switchgear.

Background technique

In a typical design, the width of the 40.5kV air-insulated switchgear cabinet is 1200mm-1400mm, and the rectangular busbar design is adopted. In this way, there are inherent deficiencies, and the air distance between the live parts in the cabinet and the air clearance to the ground cannot meet the countermeasure requirements of 300mm. Therefore, equipment manufacturers need to strengthen the insulation by installing insulating partitions and busbar insulation treatment, etc., but they cannot fundamentally solve the problem of insufficient insulation margin in the cabinet: after installing partitions, the electric field distribution is changed, resulting in the electric field in the cable room Very uneven distribution.

Utility model content

The utility model aims at the above shortcomings and provides an improved cable room structure. By changing the contact structure, the net distance between phases can meet the requirements, and the setting of the isolation plate can be canceled to achieve uniform electric field and improve insulation performance and breakdown voltage. Effect.

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

A cable room structure for an air-insulated switchgear, comprising a cabinet body and a cable room set separately from the cabinet body, a busbar is arranged in the cable room, and an air-insulated switchgear and a current transformer are also arranged in the cabinet body; the busbar One contact is provided at both ends to connect the air-insulated switchgear and the current transformer respectively; the busbar is bent from the middle at least one place, and forms more than two sub-sections, the contact and the busbar, A flexible joint is rotatably connected between each sub-section of the busbar.

Preferably, the cabinet body and the cable chamber are set for three-phase three-row wires, the middle section of the busbar located in the cable chambers on both sides has a bend, and the section of the formed subsection connected to the contact box bends inward Fold so that the distance between each cable chamber is greater than 360mm.

Preferably, the outer diameter of the busbar is 60mm, and the wall thickness of the busbar is 12.5mm.

Preferably, an insulation board is provided on both sides of the air-insulated switchgear cabinet, and the busbar is bent to ensure that the ground clearance is greater than 240mm.

Preferably, the contacts are provided with threaded holes; the connections between the contacts and the air-insulated switchgear and the current transformer are all provided with threaded connection supports.

Preferably, an insulating rubber pad is fixed in the threaded hole.

Beneficial effects: the utility model satisfies the national standard of 300mm between the phases of the 40.5kV high-current cabinet and the relative ground air clearance distance and the countermeasure requirements of the power grid company. It can cancel the phase partition, homogenize the electric field, and improve the insulation performance and breakdown voltage.

Description of drawings

Fig. 1 is a schematic structural diagram of a cable room of an air-insulated switchgear according to the present invention;

Fig. 2 is a schematic diagram of a tubular busbar in a cable room of an air-insulated switchgear according to the present invention.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings of the description, but the utility model is not limited to the following embodiments.

According to the cable room structure of an air-insulated switchgear shown in Figure 1 and Figure 2, the components of the busbar 20 of the utility model adopt rotatable flexible connections, and after the busbar 20 is rotated, the distance between the cable rooms is guaranteed to be 360, using busbar 20 with an outer diameter of 60mm, which can meet the requirement of a clear distance between phases of 300; add an insulating plate on the left and right sides of the cabinet body for ground insulation, and ensure that the clear distance to the ground after composite insulation is greater than 240 .

In this embodiment, after connecting the air-insulated switch 3 and the current transformer 4 through the rotating busbar 20, the distance between the cable chambers is 360mm, and an insulating plate 7 is respectively arranged at both ends of the cabinet body 30, and the distance between the busbar and the air The distances of the partitions are 256mm and 244mm respectively.

The outer diameter of the busbar 20 in this embodiment is 60mm, and the wall thickness is 12.5mm. The tubular busbar can effectively suppress the tip discharge, and has a larger surface area than the rectangular busbar of 60mm, which is helpful for the busbar 20. Heat dissipation.

The utility model meets the requirement that the air distance reaches 300mm, can cancel the interphase partition, and the electric field is uniform, and the insulation performance and the breakdown voltage are effectively improved.

Finally, it should be noted that the utility model is not limited to the above embodiments, and many variations are possible. All deformations that a person skilled in the art can derive or associate directly from the content disclosed in the utility model shall be considered as the protection scope of the utility model.

Claims (6)

1. A cable compartment structure for an air-insulated switchgear, comprising a cabinet (30) and a separate cable compartment (1) for the cabinet (30), the cable compartment is provided with a busbar (20), and the cabinet (30) ) is also provided with an air-insulated switchgear (3) and a current transformer (4), which is characterized in that: the two ends of the busbar (20) are respectively provided with a contact (2) to connect the air-insulated switchgear (3) and current transformer (4); said busbar (20) has more than one place bent from the middle, and forms more than two subsections, said contact (2) and busbar (20), busbar Flexible joints (5) are rotatably connected between each subsection of the row (20). 2. The cable room structure of an air-insulated switchgear according to claim 1, characterized in that: the cabinet body (30) and the cable room (1) are provided with three-phase three-row wires, and the cables located on both sides There is a bend in the middle section of the busbar (20) in the chamber (1), and the section connected to the contact box (6) in the formed subsection is bent inward so that the distance between each cable chamber (1) is greater than 360mm . 3. The cable room structure of an air-insulated switchgear according to claim 2, characterized in that: the outer diameter of the busbar (20) is 60mm, and the wall thickness of the busbar (20) is 12.5mm. 4. The cable room structure of an air-insulated switchgear according to any one of claims 1-3, characterized in that an insulating plate (7) is provided on both sides of the air-insulated switchgear (3) , after the busbar (20) is bent, the clearance to the ground is guaranteed to be greater than 240mm. 5. The cable compartment structure of an air-insulated switchgear according to claim 1, characterized in that: the contact (2) is provided with a threaded hole (8); the contact (2) is connected to the air-insulated switchgear (3) The joints of the current transformers (4) are provided with threaded connection supports. 6. The cable room structure of an air-insulated switchgear according to claim 5, wherein an insulating rubber pad is fixed in the threaded hole.