40.5kV Gas Insulated Cable Distribution Box

Abstract

This utility model provides a 40.5kV gas-insulated cable junction box, mainly composed of an outer casing, an operating mechanism compartment, an operating mechanism, an outgoing cable compartment, outgoing cables, a gas-filled compartment for the disconnecting switch, a surge arrester, an incoming cable compartment, incoming cables, and partitions. The cable junction box has independent compartments. The gas-filled compartment for the disconnecting switch is insulated with sulfur hexafluoride gas and is welded from 3mm thick stainless steel plate. The outer casing of the cable junction box is assembled from 2mm thick steel plate after bending. This utility model has a compact structure, good sealing performance, high protection level, and strong corrosion resistance.

Description

Technical Field

[0001] This utility model relates to the field of power system application equipment, specifically an outdoor 40.5kV gas-insulated cable junction box. Background Technology

[0002] With the accelerated development of new energy power plants, industrial and mining enterprises, power grid construction, and the construction of large-scale wind and solar power bases in the Gobi Desert, the market demand for 40.5kV cable junction boxes has increased significantly. 40.5kV cable junction boxes are core equipment in power distribution networks, primarily responsible for power distribution, line protection, and system monitoring, and are used for T-connections, ring networks, and fault isolation of cable lines. Currently, most cable junction boxes use air insulation. In areas with thin air, this reduces the withstand voltage of the external insulation (air gaps, surface creepage), making it prone to breakdown or partial discharge. Simultaneously, conductive components exposed to air are susceptible to condensation and corrosion. Utility Model Content

[0003] To address the aforementioned shortcomings in the existing technology, this utility model provides a 40.5kV gas-insulated cable junction box.

[0004] This utility model is achieved using the following technical solution:

[0005] A 40.5kV gas-insulated cable junction box includes an outer casing, an operating mechanism compartment, an operating mechanism, an outgoing cable compartment, an outgoing cable, a gas-filled disconnector compartment, a surge arrester, an incoming cable compartment, an incoming cable, and a partition. The partition is installed in the middle of the outer casing, dividing the outer casing into the gas-filled disconnector compartment, the outgoing cable compartment, the incoming cable compartment, the operating mechanism compartment, and the outgoing cable compartment. The gas-filled disconnector compartment is insulated with sulfur hexafluoride gas.

[0006] Furthermore, the outer casing is assembled from 2mm thick aluminum-zinc coated steel sheet after bending.

[0007] Furthermore, the gas-filled compartment of the disconnect switch is welded from a 3mm thick stainless steel plate and is a low-pressure sealed compartment filled with sulfur hexafluoride gas.

[0008] Furthermore, the operating mechanism is installed in the operating mechanism compartment and connected to the air-filled compartment of the disconnect switch.

[0009] Furthermore, the incoming cable compartment is an air-insulated compartment, which contains the incoming cable and the surge arrester. The incoming cable adopts an internal conical plug-in installation method, and 1 to 3 single-core cables can be connected in parallel for each phase. The surge arrester adopts an internal conical plug-in installation method, and the bottom of the incoming cable compartment is equipped with a removable sealing plate.

[0010] Furthermore, the outgoing cable compartment is equipped with an outgoing cable.

[0011] Compared with the prior art, the technical advantages of this utility model are: compact structure, good sealing performance, high protection level, and strong corrosion resistance. Attached Figure Description

[0012] Figure 1 : A three-dimensional schematic diagram of the front view of this utility model.

[0013] Figure 2 : Rear view three-dimensional schematic diagram of the present utility model.

[0014] Figure 3 : Schematic diagram of the internal structure of this utility model.

[0015] Figure 4 : Schematic diagram of multiple branch circuit compartments of this utility model.

[0016] Reference numerals: 1-Outer casing, 2-Operating mechanism compartment, 3-Operating mechanism, 4-Outgoing cable compartment, 5-Outgoing cable, 6-Disconnecting switch gas-filled compartment, 7-Surge arrester, 8-Incoming cable compartment, 9-Incoming cable, 10-Partition. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0018] To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted.

[0019] See Figure 1 , Figure 2 , Figure 3 , Figure 4 This utility model relates to a 40.5kV gas-insulated cable junction box, specifically comprising an outer casing 1, an operating mechanism compartment 2, an operating mechanism 3, an outgoing cable compartment 4, an outgoing cable 5, a gas-filled disconnector compartment 6, a surge arrester 7, an incoming cable compartment 8, an incoming cable 9, and a partition 10. The outer casing 1 is constructed from 2mm thick aluminum-zinc coated steel sheet, bent and assembled with bolts. The partition 10 is installed in the middle of the outer casing 1, dividing it into the gas-filled disconnector compartment 6, the outgoing cable compartment 9, the incoming cable compartment 8, and the operating mechanism compartment 2.

[0020] The gas-filled compartment 6 of the disconnector switch is welded from a 3mm thick stainless steel plate. It is a low-pressure sealed compartment filled with sulfur hexafluoride gas. The compartment contains the main busbar, branch busbar, busbar connector socket, connecting bushing, and three-position disconnector switch.

[0021] The operating mechanism 3 is installed in the operating mechanism compartment 2 and connected to the gas-filled compartment 6 of the disconnecting switch. It is used to operate the three-position disconnecting switch and realize its working, isolation and grounding functions, and the functions are interlocked.

[0022] The incoming cable compartment 8 is an air-insulated compartment, housing the incoming cable 9 and the surge arrester 7. The incoming cable 9 uses an internal conical plug-in installation method, allowing for the parallel connection of 1 to 3 single-core cables per phase, providing reliable insulation performance. The surge arrester also uses an internal conical plug-in installation method. Figure 1-2 As shown, construction personnel can enter the cabinet from the back of the cable junction box to carry out construction and maintenance on the cable compartment. The bottom of the incoming cable compartment 8 is equipped with a removable sealing plate to facilitate the installation of cables into the cabinet.

[0023] Outgoing cable compartment 4 contains outgoing cable 5, such as Figure 4 As shown, the 40.5kV gas-insulated cable junction box can be equipped with corresponding branch circuits as needed, and each branch circuit is separated by a separate compartment.

[0024] With the above structure, the main electrical components are sealed in a metal shell enclosed by sulfur hexafluoride gas, which has strong corrosion resistance, high protection level, small size and compact structure.

[0025] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A 40.5kV gas-insulated cable junction box, characterized in that: It includes an outer casing (1), an operating mechanism compartment (2), an operating mechanism (3), an outgoing cable compartment (4), an outgoing cable (5), a disconnector gas-filled compartment (6), a surge arrester (7), an incoming cable compartment (8), an incoming cable (9), and a partition (10). The partition (10) is installed in the middle of the outer casing (1) and divides the outer casing (1) into a disconnector gas-filled compartment (6), an outgoing cable compartment (9), an incoming cable compartment (8), an operating mechanism compartment (2), and an outgoing cable compartment (4). The disconnector gas-filled compartment (6) is insulated with sulfur hexafluoride gas.

2. The 40.5kV gas-insulated cable junction box according to claim 1, characterized in that: The outer casing (1) is made of 2mm thick aluminum-zinc coated steel plate, which is bent and assembled.

3. The 40.5kV gas-insulated cable junction box according to claim 1, characterized in that: The gas-filled compartment (6) of the disconnector switch is welded from a 3mm thick stainless steel plate. It is a low-pressure sealed compartment filled with sulfur hexafluoride gas.

4. The 40.5kV gas-insulated cable junction box according to claim 1, characterized in that: The operating mechanism (3) is installed in the operating mechanism compartment (2) and connected to the gas-filled compartment (6) of the disconnect switch.

5. The 40.5kV gas-insulated cable junction box according to claim 1, characterized in that: The incoming cable compartment (8) is an air-insulated compartment, which contains an incoming cable (9) and a surge arrester (7). The incoming cable (9) is installed using an inner cone plug-in method, and 1 to 3 single-core cables can be connected in parallel for each phase. The surge arrester (7) is installed using an inner cone plug-in method. The bottom of the incoming cable compartment (8) is equipped with a removable sealing plate.

6. The 40.5kV gas-insulated cable junction box according to claim 1, characterized in that: The outgoing cable compartment (4) contains the outgoing cable (5).

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