CN214674253U

CN214674253U - Laying channel of high-voltage cable of 110kV and above grade

Info

Publication number: CN214674253U
Application number: CN202120630493.2U
Authority: CN
Inventors: 戴月涛; 朱子钊; 孟克; 赵芳; 宋克英; 庞继勇
Original assignee: SEPCO Electric Power Construction Co Ltd
Current assignee: SEPCO Electric Power Construction Co Ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2021-11-09
Anticipated expiration: 2031-03-29

Abstract

The utility model discloses a laying channel of high-voltage cables of 110kV and above, which belongs to the technical field of transmission line engineering, wherein the laying channel is provided with at least two wiring channels, and the lengths of the wiring channels are different; two ends of the laying channel are open ends, and each routing channel shares two open ends; the routing channel adopts one of a cable trench, a cable bridge or a cable buried pipe. The utility model discloses the 110kV of example and above grade high tension cable lay the passageway, this passageway increases the length of cable when laying initially through the mode that increases the bend, when the cable breaks down, takes out the cable and removes in shorter passageway, takes out the cable that drags out and enough does a cable head, does not need the full line to take out, the construction volume that has significantly reduced.

Description

Laying channel of high-voltage cable of 110kV and above grade

Technical Field

The utility model relates to a transmission line engineering technical field especially relates to a 110kV and above grade high tension cable lay passageway.

Background

In the actual operation of a power plant and a transformer substation, the weakest link of a whole high-voltage cable line is a cable joint and a terminal cable joint. When a cable head is damaged and wasted due to short-circuit fault or grounding fault of a high-voltage cable line of 110kV or above, a part of cable needs to be pulled out to manufacture the cable head again. In the current engineering, the allowance of the cable length meeting the snakelike laying requirement is generally small, and a part of the cable is difficult to pull out to manufacture a cable head again, so that the whole cable is scrapped and needs to be purchased again.

The loss caused by scrapping and re-purchasing the whole cable is huge. Firstly, the high-voltage cable is expensive, the price of a single meter of the 110kV single-core cable reaches hundreds or even thousands, and the purchase cost of the cable is high; the scrapped cables need to be drawn out from the cable channel, the workload of drawing out is not small for long-distance cables, particularly, the cables laid in the cable trench also relate to the lifting and restoring of a cable trench cover plate, and the labor amount cannot be estimated; thirdly, the replacement of a new cable can increase part of workload, such as the fixation of the cable, the installation of a cable clamp, the removal and restoration of a fireproof plugging material and the like; fourthly, due to the fact that a fixed length of time is needed for purchasing, drawing out and placing the cable, the power failure time of the power plant/power station is prolonged, and loss is beyond the balance. In addition, the bending radius of the high-voltage cable of 110kV or above is large, and it is difficult to wind the cable into a coil in order to reserve a length of one cable.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects in the prior art, the laying channel of the high-voltage cable of 110kV or above is provided, the length of the cable during initial laying is increased in a mode of increasing a bend, when the cable breaks down, the cable is pulled out and then moves to a shorter channel, the pulled out cable is enough to be a cable head, the cable does not need to be pulled out in a whole line, and the construction amount is greatly reduced.

The utility model provides a technical scheme that its technical problem adopted does:

the utility model provides a laying channel of 110kV and above grade high tension cable, laying channel and being equipped with two at least line passageways, each length of walking the line passageway all is all inequality.

Furthermore, two ends of the laying channel are open ends, and each routing channel shares two open ends.

Furthermore, two routing channels are arranged.

Furthermore, one of the routing channels is a bending section, and the other routing channel is a straight section.

Further, the length of the bending section is at least 2m longer than that of the straight section.

Further, the laying channel is arranged on one side close to the main transformer.

Further, the laying channel is arranged on the side close to the side booster station.

Furthermore, the routing channel adopts one of a cable trench, a cable bridge or a cable buried pipe.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. the utility model discloses the laying channel of 110kV and above grade high tension cable of example, through setting up the wiring passageway of different length, can take out the cable tip and lay to in short with a wiring passageway when the cable head breaks down, the cable length of taking out is enough to do a cable head, therefore need not scrap whole cable, reduce whole cable because the surplus is not enough and cause the probability of scrapping, reduce the loss that brings because of purchasing the cable again;

2. the utility model discloses the laying channel of 110kV and above grade high tension cable of example, because the passageway sets up near cable head end (main transformer near) or terminal (offside booster station), therefore when the cable head damages and need take out the cable, only need take out the cable in the passageway scope of buckling and already, and do not need the whole line to take out, greatly reduced the construction volume;

3. the laying channel of the high-voltage cable of 110kV and above grade of the utility model can adopt a cable trench, a cable bridge or a buried pipe according to the laying condition of the whole cable on site, the selectable laying mode is more flexible, the total amount of the increased wiring channel is less, and the investment is less;

4. the laying channel of the high-voltage cable of 110kV grade and above in the embodiment of the utility model is characterized in that under the condition that the routing channel adopts a cable trench or a buried pipe, the cable is taken out and then placed in the straightway cable trench/buried pipe again, and the straightway cable trench/buried pipe is ready-made, so that the pouring and backfilling are not needed to be excavated again; under the condition that the routing channel adopts the cable bridge, the cable is drawn out and then placed in the straight-line cable bridge again, and the cable bridge and the support of the cable bridge do not need to be reset because the straight-line cable bridge is ready-made, so that the rework amount is reduced.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the high voltage cable of the present invention during normal laying;

fig. 3 is the utility model discloses lay the structure schematic diagram behind the high tension cable head trouble.

In the figure: 1-bending section, 2-straight section, 3-laying channel, 4-cable head and 5-high-voltage cable.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1, the present embodiment provides a laying channel 3 of a high voltage cable 5 of 110kV or above, where the laying channel 3 includes two routing channels, one of the routing channels is a bent section 1, and the other routing channel is a straight section 2, and since the length of the bent section 1 is longer than that of the straight section 2, the cable head 4 can be remanufactured with an extra length after the cable head 4 fails.

The conventional high voltage cable 5 channel design does not include a bend segment 1 and the cabling is shown in fig. 3. For cables of 110kV and above, the allowance is generally small after the cable length meets the snake-shaped laying requirement. If the cable head of the cable terminal is in fault, the cable with partial length needs to be drawn out for manufacturing the cable head again, and the cable is forced to be straightened by sacrificing the snakelike laying length of the cable, which is not preferable. Because the conductor temperature rise of the high-voltage cable causes thermal expansion and cold contraction along with the change of load current, the generated thermal mechanical force is huge, the cable joint and the terminal can be damaged, and the service life of the cable is shortened due to fatigue strain of the metal sheath; high voltage cables are usually laid in a horizontal or vertical serpentine shape in the cable channel, in order to counteract the change in cable length caused by thermal expansion and contraction, thereby preventing the cable joint, termination, metal sheath and cable accessories from being damaged. Therefore, the cable is not preferable to be straightened forcibly, and the whole cable is subject to the problem of being wasted.

Therefore, a bend 1 is added to the linear laying channel 3, the bend 1 and the linear section 2 sharing an open end. When laying, as shown in fig. 2, firstly the cable penetrates through the bending section 1, after the cable head 4 has a fault, as shown in fig. 3, the end of the cable is drawn out and laid on the straight section 2 of the channel, and the drawn high-voltage cable 5 is enough to be used as one cable head 4 without replacing the whole high-voltage cable 5.

The angle of the bending section 1 is determined according to the requirement of the bending radius of the high-voltage cable 5; the length of the bending section 1 is generally longer than that of the straight section 2 by more than 2m, so that the cable head 4 is manufactured by using the length of 2 m; according to the specific situation of site construction, after the bending angle and the total length of the bending section 1 are determined, the scheme of the channel can be determined. The angle of the bending section 1, the length of the straight line section 2 and the like can be adjusted according to the grade of the high-voltage cable 5 and the bending radius, and the bending section 1 is required to meet the bending radius requirements of the cable during laying and running.

When the cable laying channel 3 adopts a cable trench, the bending section 1 and the straight section 2 preferably adopt the cable trench or a buried pipe. When the cable laying channel 3 adopts a cable bridge, the bent section 1 and the straight section 2 preferably adopt the cable bridge.

Under the condition that the cable trench or the buried pipe is adopted in the routing channel, the cable is drawn out and then placed in the straight-line-section-2 cable trench/buried pipe again, and because the straight-line-section-2 cable trench/buried pipe is ready-made, the cable trench/buried pipe does not need to be excavated again and poured and backfilled. Under the condition that the cable bridge is adopted in the routing channel, the cable is drawn out and then placed in the straight-line-section-2 cable bridge, and the cable bridge and the support of the cable bridge do not need to be reset because the straight-line-section-2 cable bridge is ready-made. In summary, the two routing channels are provided to reduce rework amount.

The wiring channel is arranged flexibly, a position can be arranged only close to the main transformer side, a position can be arranged close to the opposite side booster station side, and the two sides of the main transformer side and the two sides of the transformer station side can be selected to be arranged so that the cable can be pulled conveniently. In this embodiment, the routing channel is disposed near the main transformer side. The distance from the outlet of the wiring channel to the cable terminal at the transformer side only needs to be kept away from the backfill range of the cable terminal, and the position can be determined conveniently according to site construction.

It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

The laying channel of the high-voltage cable of 1.110kV and above is characterized in that the laying channel is provided with two routing channels, the lengths of the routing channels are different, one routing channel is a bending section, and the other routing channel is a straight section.
2. The cabling channel for high voltage cables of 110kV and above grade according to claim 1, wherein both ends of the cabling channel are open ends, and each routing channel shares two open ends.
3. A cabling channel for a high voltage cable of the order of 110kV and above according to claim 1, wherein the length of said bend section is at least 2m longer than said straight section.
4. The cabling channel for high voltage cables of the order of 110kV and above according to claim 1, wherein said cabling channel is installed on the side close to the main transformer.
5. The installation of a high voltage cable of the order of 110kV and above according to claim 1, wherein said installation is installed on the side close to the side booster station.
6. The cabling channel for high voltage cable of 110kV and above grade according to claim 1, wherein the routing channel is one of a cable trench, a cable tray or a cable pipe.