Double-loop tunnel wiring architecture containing standby-phase GIL

Abstract

The utility model belongs to the technical field of photovoltaic power transmission and distribution, and particularly discloses a double-loop tunnel wiring framework containing a standby phase GIL. Comprising a tunnel, supports and GIL, the cross section of the tunnel is a rectangle with the horizontal lower bottom edge, five pairs of supports are symmetrically arranged on the two side walls of the tunnel from bottom to top, and one GIL is fixed between every two adjacent supports on the same side; the bottom of the GIL makes contact with the upper surface of the support below and is installed outwards. A channel is reserved between each pair of supports in the horizontal direction, and the uppermost pair of GIL is a standby phase. The design ensures the maximum utilization rate of the tunnel, reduces redundant facilities, is simple and clear in line, can conveniently and clearly complete the maintenance of a fault line and the replacement of the GIL, can effectively shield the interference of a power line on communication, illumination and other lines, improves the maintenance efficiency, and is suitable for being popularized in the industry of completing power transmission and distribution through the tunnel.

Description

Technical Field

[0001] This utility model belongs to the field of power transmission and distribution technology, and specifically discloses a dual-circuit tunnel cabling architecture with a spare phase GIL. Background Technology

[0002] With the rapid development of my country's economy and the increasing scale of urbanization, the contradiction between overhead power lines and urban planning and land resources is becoming more and more prominent. The burial of overhead power lines underground and the installation of power lines through tunnels are attracting more and more attention from those skilled in the art.

[0003] Gas-insulated metal-enclosed transmission lines (GILs) have broad application prospects in urban power grids due to their advantages such as large transmission capacity, high operational reliability, narrow corridor occupation, immunity to adverse weather conditions, and low life-cycle cost.

[0004] During the transportation, storage, hoisting, and on-site connection of GILs in urban power grids, tiny cracks may appear at the insulators. After dual-circuit GILs are energized, they generate a high-potential electric field. Under the influence of this high-potential electric field, the cracks in the supporting insulators expand, partial discharge intensifies, and insulation performance deteriorates. Ultimately, this leads to breakdown arc discharge of the supporting insulators, affecting power supply reliability and potentially damaging generator sets in severe cases.

[0005] To ensure the reliability of critical power facilities and save tunnel space as much as possible to reduce excavation costs, dual-circuit GILs with spare phases are often used for cabling in tunnels. Due to the large number of wire harnesses and the large size of the GILs, it becomes very inconvenient to replace the wire harness when a phase of the GIL fails. Communication or lighting cables in tunnels are also frequently affected by parasitic capacitance and inductance, resulting in low reliability of the cable placement scheme in tunnels. Utility Model Content

[0006] To address the technical problems listed in the background section, this utility model provides a dual-loop tunnel cabling architecture with a spare phase GIL. The specific technical solution is as follows:

[0007] A dual-circuit tunnel cabling architecture with a spare phase GIL includes a tunnel, brackets, and GILs. The tunnel has a rectangular cross-section with a horizontal bottom edge. Five pairs of brackets are symmetrically arranged on both sides of the tunnel from bottom to top. A GIL is fixed between two adjacent brackets on the same side. The bottom of the GIL contacts the upper surface of the bracket below and is installed outward. A channel is left between each pair of brackets in the horizontal direction. The top pair of GILs is the spare phase.

[0008] The spare phase is only used temporarily when replacing the faulty GIL in the main circuit. Its usage frequency is low, and it is rarely replaced, so it is fixed at the top. This makes the A / B / C phase GIL positions relatively low, facilitating replacement. The cabling structure on both sides of the passage allows for bidirectional inspection with a single pass by the work vehicle, improving maintenance efficiency.

[0009] Preferably, it also includes a slot box disposed on the upper surface of the uppermost support, for laying auxiliary cables for power supply, communication and monitoring inside it; the slot box has a rectangular cross-section and is made of metal.

[0010] The topmost tray is furthest from the normally connected A / B / C phase GIL, and the tray is made of metal, which has the function of shielding against external electric fields, so that the auxiliary cables inside are subjected to minimal interference.

[0011] Preferably, the lateral width of the channel is 2300-2500 mm.

[0012] This width range allows small work vehicles to pass through, improving maintenance efficiency.

[0013] Preferably, the upper surface of the topmost support is 300-350 mm from the tunnel top, and the lower surface of the bottommost support is 250-300 mm from the tunnel bottom.

[0014] This bracket spacing ensures GIL's moisture protection and heat dissipation effects.

[0015] Preferably, the horizontal width of the support on the tunnel cross-section is 2.1-2.6 times the outer diameter of the GIL, and the distance between two adjacent supports on the same side of the tunnel is 2.1-2.6 times the outer diameter of the GIL.

[0016] When maintenance personnel need to replace the GIL, they can take the new GIL from the vehicle under maintenance, place it inside the same bracket over the GIL to be replaced, and then remove the GIL to be replaced that is mounted on the outside and place it on the vehicle under maintenance.

[0017] Preferably, the GILs located on the same side of the tunnel from top to bottom are the spare phase, phase A, phase B, and phase C.

[0018] This sorting method is conducive to unified management, and once it is established as a convention, maintenance and replacement work can be completed more quickly.

[0019] Compared with the prior art, this utility model has the following advantages:

[0020] This utility model provides a dual-circuit tunnel cabling architecture with a spare phase GIL that ensures maximum tunnel utilization, reduces redundant facilities, and features a simple and clear wiring system. It enables convenient and clear maintenance of faulty lines and GIL replacement, while effectively shielding power lines from interference with communication and lighting lines, thus improving maintenance efficiency. It is suitable for promotion in industries that use tunnels for power transmission and distribution. Attached Figure Description

[0021] Figure 1 This is a cross-sectional schematic diagram of a dual-circuit tunnel cabling architecture with a spare phase GIL in an embodiment of this utility model;

[0022] Among them, 1. tunnel; 2. support; 3. GIL; 21. slot box; 51. channel. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] like Figure 1 As shown in the figure, this utility model provides an arrangement structure of a dual-circuit GIL with a spare phase in a tunnel, including a tunnel 1, five supports 2 symmetrically arranged in the tunnel 1, and four pairs of GIL3 placed between two adjacent supports 2. The bottom of the GIL3 contacts the upper surface of the support 2 and is fixed to the outside. There is a channel 51 between the supports 2 on both sides of the tunnel 1, with a lateral width L of 2300 mm. The top support 2 has a slot box 21.

[0025] The distance between the five supports 2 arranged sequentially from top to bottom on each side of tunnel 1 is 1314 mm; the distance between the topmost support 2 and tunnel 1 is 300 mm, and the distance between the bottommost support 2 and tunnel 1 is 250 mm.

[0026] The lateral width of the bracket 2 is 1100 mm; the outer diameter of the GIL3 is 520-625 mm, and the conventional outer diameter is 566 mm.

[0027] In actual use, the lateral width of passage 51 is 2300 mm, which can meet the passage requirements of installation tool vehicles and the passage needs of operators when the above-mentioned tool vehicles are in operation; therefore, this layout can facilitate the installation, disassembly, maintenance, inspection and emergency repair of GIL3.

[0028] Cable tray 21 facilitates the laying of power supply, communication, and monitoring cables. This arrangement maximizes the use of rectangular tunnel space and is feasible. Installation and maintenance personnel can easily perform GIL3 docking, installation, or disassembly, and observe the operating status of the GIL3 surface, meeting the space requirements for various operations such as installation, disassembly, maintenance, inspection, and emergency repair.

[0029] On each side of Tunnel 1, four GIL3 circuits—the spare phase, A phase, B phase, and C phase—are arranged from top to bottom between five supports 2. The arrangement of the spare phases in the tunnel ensures that in the event of a single-phase fault in each GIL3 circuit, the spare phase can replace the faulty phase to supply power, thus meeting the requirements for power supply reliability.

[0030] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A dual loop tunnel routing architecture with a backup phase GIL, characterized in that, It comprises a tunnel (1), a support (2) and a GIL (3), the cross section of the tunnel (1) is a rectangle with the lower bottom horizontal, 5 pairs of supports (2) are symmetrically arranged from bottom to top on the two side walls of the tunnel (1), and one GIL (3) is fixed between two adjacent supports (2) on the same side; the bottom of the GIL (3) is in contact with the upper surface of the support (2) below and is installed outwardly; a passage (51) is left between each pair of supports (2) in the horizontal direction, and the uppermost pair of GILs (3) are standby phases; the horizontal width of the support (2) on the cross section of the tunnel (1) is 2.1-2.6 times the outer diameter of the GIL (3), and the distance between two adjacent supports (2) on the same side of the tunnel (1) is 2.1-2.6 times the outer diameter of the GIL (3).

2. A dual circuit tunnel wiring architecture with a backup phase GIL as claimed in claim 1, wherein, It also comprises a groove box (21) arranged on the upper surface of the uppermost support (2), which is used for laying auxiliary cables for power supply, communication and monitoring inside; the cross section of the groove box (21) is rectangular and is made of metal.

3. A dual circuit tunnel wiring architecture with a backup phase GIL according to claim 2, wherein, The transverse width of the passage (51) is 2300-2500 mm.

4. The dual circuit tunnel wiring architecture with a backup phase GIL of claim 3, wherein, The upper surface of the uppermost support (2) is 300-350 mm away from the top of the tunnel (1), and the lower surface of the lowermost support (2) is 250-300 mm away from the bottom of the tunnel (1).

5. A dual circuit tunnel wiring architecture with a backup phase GIL according to claim 4, wherein, The GILs (3) from top to bottom on the same side of the tunnel (1) are standby phase, A phase, B phase and C phase in turn.

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