WO2019061175A1

WO2019061175A1 - Cable armoring method

Info

Publication number: WO2019061175A1
Application number: PCT/CN2017/104047
Authority: WO
Inventors: 王丽媛; 张建民; 赵囿林; 许愿; 叶成; 薛建林; 谢书鸿
Original assignee: 中天科技海缆有限公司; 江苏中天科技股份有限公司
Priority date: 2017-09-27
Filing date: 2017-09-28
Publication date: 2019-04-04
Also published as: CN109559858B; CN109559858A

Abstract

A cable armoring method, comprising the following steps: step one: according to an installation condition, pre-setting a required current-carrying capacity value to be I, setting a cross-sectional area S1 of a conductor, and providing N first metal wires (21) and M second metal wires (22), which are used for armoring; step two: calculating that a current-carrying capacity is I1 according to S1, the N first metal wires (21) and the M second metal wires (22); step three: comparing I1 with I, and when I1(S, N, M) ≥ I and I1(S, N-1, M+1) < I, carrying out the next step; and step four: arranging, in a traction manner, the N first metal wires (21) and the M second metal wires (22) outside the circumference of a cable core (10) including the conductor to carry out stranding and armoring, so as to form an armor layer (20) of the cable (100). By means of optimizing the ratio of the cross-sectional area of a conductor to the number of metal wires, the current-carrying capacity thereof reaches a required value, the mechanical strength and costs are optimized, and the amount of materials used is rational. The same cable (100) can also meet the requirements for the current-carrying capacity, mechanical strength and costs thereof under multi-segment installation conditions.

Description

Cable mounting method

Technical field

The present invention relates to the field of AC power cable technology, and in particular to a cable mounting method.

Background technique

Cable is the main component used for power transmission and power generation to transmit and distribute electric energy. The current carrying capacity is affected by the installation conditions and cannot meet the requirements. Increasing the cross-sectional area of the cable conductor and reducing the armoring loss are effective ways to increase the current carrying capacity. . Increasing the cross-sectional area of the cable conductor will significantly increase the current carrying capacity, increase the cable size and weight, and increase the construction difficulty; the existing steel wire armor has good mechanical performance, but the armoring loss is large, and the current carrying capacity is small; The electric resistance is small, the armoring loss is small, but the mechanical strength is lower than that of the steel wire armor, and the price is expensive. Changes in installation conditions can cause changes in the current carrying capacity of the cable, so that the current carrying capacity and mechanical strength of the same cable cannot meet the requirements and are optimal under all installation conditions.

Summary of the invention

In view of the above, it is necessary to provide an improved method of armoring the cable, which is simple and easy to operate and construct, and the molded product has the characteristics of adjustable current carrying capacity, small armor loss and high mechanical strength.

The technical solution provided by the invention is:

A method of armoring a cable, the cable comprising a conductor, comprising the steps of:

Step 1: According to the installation condition, the current carrying capacity requirement value is I, the conductor cross-sectional area S=S1 is set, and the N first metal wires and the M second metal wires for armoring are provided;

Step 2: Calculating the current carrying capacity as I1 according to the first metal wire of S1, N and the second metal wire of M;

Step 3: Comparing I1 and I, when I1(S, N, M) ≥ I and I1(S, N-1, M+1) < I, proceed to the next step;

Step 4: Pulling the N first metal wires and the M second metal wires into the package The core of the conductor containing the conductor is stranded and sheathed to form an armor layer of the cable.

Further, the above step three includes:

When I1 (S1, N = 0, M = Mmax1) > I, return to step 1, reset the conductor cross-sectional area S is S2, S2 < S1;

When I1 (S1, N = 0, Mmax1) < I and I1 (S1, Nmax1, M = 0) < I, return to step one, reset the conductor cross-sectional area S is S3, S3> S1;

When I1(S, N=0, Mmax)<I and I1(S, Nmax-1, M=1)>I, returning to step 1, resetting the number N of the first metal lines to N1 and The number M of the second metal line is M1, where N1>0, M1>1;

When I1(S, N1-1, M1+1)>I, returning to step 1, resetting the number N of the first metal lines to N2 and the number M of the second metal lines to M2, wherein M2>M1, M2+N2=M1+N1;

When I1(S, N1, M1) < I, returning to step 1, resetting the number N of the first metal lines to N3 and the number M of the second metal lines to M3, where N3>N1, M3+N3=M1+N1.

Further, the cable includes at least a first segment and a second segment, and the total number of M and N on each segment is the same value, and M or N on the first segment and the second segment are Different values.

Further, at least one of the second metal wires is disconnected at the end of the first segment of the preset length, and the single first wire is spliced to the disconnected second metal wire The trailing end forms the beginning of the second segment.

Further, at the end of the first segment of the preset length, at least one of the first metal wires is disconnected, and a single of the second metal wires is spliced to the first metal wire that is broken. The trailing end forms the beginning of the second segment.

Further, the cable satisfies both the rated current and the mechanical strength of the multi-segment routing condition.

Further, each of the first metal wires is a circular or flat copper wire or an aluminum wire.

Further, each of the second metal wires is a round wire or a flat wire.

Further, an outer sheath layer is disposed outside the armor layer.

Compared with the prior art, the metal wire selected for armoring is designed according to the installation conditions. The conductor cross-sectional area and the number of metal wire roots are matched, the current carrying capacity reaches the required value, the mechanical strength and cost are optimized, and the used material amount is reasonable. On the premise that the total number of metal wires is constant, the number of the first metal wires is increased, the armor resistance and loss are reduced, the current carrying capacity of the cable is increased, and the high current carrying capacity is met; The different numbers of the segmented first metal wire and the second metal wire are arranged to make the current carrying capacity of the cable adjustable and controllable, and the same cable can simultaneously satisfy the current carrying capacity and mechanical strength of the multi-segment mounting condition. The cost requirement, material saving and cost, the method is easy to operate, easy to construct, economical and practical.

DRAWINGS

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart showing the design of the current carrying capacity of the cable of the present invention.

FIG. 2 is a schematic structural diagram of a first segment of a preset length of a cable according to an embodiment of the present invention.

3 is a schematic structural view of a second segment of the preset length of the cable shown in FIG. 2.

4 is a schematic structural view of a third segment of the preset length of the cable shown in FIG. 2.

Description of the reference signs:

缆线 Cable	100100
线芯 Core	1010
铠装Armoured	2020
第一金属线First metal wire	21twenty one
第二金属线Second metal wire	22twenty two
外护层 Outer sheath	3030

The embodiments of the present invention will be further described in conjunction with the accompanying drawings.

Detailed ways

The above described objects, features and advantages of the embodiments of the present invention will be described in detail. It should be noted that the features in the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention. The embodiments described are merely some of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the embodiments of the present invention.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to the embodiments of the invention, unless otherwise defined. The terminology used in the description of the present invention is for the purpose of describing the particular embodiments, and is not intended to limit the embodiments of the invention.

Referring to FIG. 1 and FIG. 2, the cable 100 of the present invention is a main component for power transmission and power generation for transmitting and distributing electric energy, and may be a single-core cable or a multi-core cable or an opto-electric composite cable, etc., for underwater or cable. In different environments such as trenches or tunnels, the current carrying capacity may be affected by the conditions of the area and working conditions and cannot meet the requirements of the installation conditions. The cable 100 includes a core 10 and an armor layer 20. The core 10 is disposed at the center of the cable 100 and is a multi-layer structure including at least a conductor. The armor layer 20 is disposed on the cable. The cable core 20 is used outside the circumference for mechanical protection and corrosion protection. The increase of the current carrying capacity of the cable 100 can be achieved by increasing the cross-sectional area of the conductors in the core 10 and reducing the loss of the armor 20. The simultaneous design of the two can optimize the current carrying capacity, mechanical performance and cost. .

Referring to FIG. 1 , an embodiment of the present invention provides an armoring method for the cable 100, which is to optimize the conductor cross-sectional area and armor resistance and loss of the cable 100 to adjust its current carrying capacity and Mechanical performance, the main steps are as follows:

Step 1: According to the installation condition, the current carrying capacity requirement value is I, the conductor cross-sectional area S1 is set, and the N first metal wires and the M second metal wires for armoring are provided. The conductor is a carrier for current transmission, and the current carrying capacity is closely related to the cross-sectional size. Under the same preset conditions, the conductor has a large cross-sectional area and a large current carrying capacity. The armoring loss is an important parameter affecting the current carrying capacity of the conductor of the cable 100, and the armoring loss is small, and the current carrying capacity is high. The resistance value of the first metal wire 21 is small, the loss generated for armoring is small, and the current carrying capacity of the conductor is high under armor conditions, and each of the first metal wires 21 is a round copper wire; the second metal The wire 22 has high mechanical strength and low cost, and is used for armoring the cable 100. The second metal wire 22 is a round wire.

In other embodiments, the single first metal wire 21 may be an aluminum wire, the cable The first metal wire 21 included in the wire 100 may also be a combination of a copper wire and an aluminum wire. The first metal wire 21 and the second metal wire 22 may be flat wires.

Step 2: Calculate the current carrying capacity as I1 according to the first metal wire of S1, N and the second metal wire of M.

According to the setting S, I, according to the international standard IEC60287:

Mmax: the total number of single layers of the second metal wire 22 sheathed under the conductor cross-sectional area S, such as S = S1, N = 0, calculated as Mmax1;

Nmax: the total number of single layers of the first metal wire 21 sheathed under the conductor cross-sectional area S, such as S = S1, M = 0, calculated as Nmax1;

This step is a design step for optimizing the cross-sectional area S of the conductor, the configuration of the armored metal wire, and the mechanical properties. For example, according to the installation conditions, the current carrying capacity requirement value I=1450A is set, and S=S1=1400m ^{2 is} set according to the international standard IEC60287:

I1(S1,0,Mmax1)=I1(S1,0,67)=1024A<I=1450A;

I1(S1, Nmax1, 0)=I1(S1,67,0)=1438A<I=1450A;

Return to step one and reset S=S2=1600m ² :

I1(S2,0,Mmax2)=I1(S2,0,69)=1064A<I=1450A;

I1(S2, Nmax2-1, 1)=I1(S2,68,1)=1506A>I=1450A;

Return to step one and set M=M1=33, N=N1=36:

I1(S2, N1, M1)=I1(S2, 36, 33)=1429A<I=1450A;

Return to step one, reset M=M3=M1-4=29, N=N3=N1+4=40:

I1(S2, N3, M3)=I1(S2,40,29)=1447A<I=1450A;

Return to step one and continue to reset M=M3-1=28, N=N3+1=41:

I1(S2, N3+1, M3-1)=I1(S2,41,28)=1451A>I=1450A;

At this time, I1(S, N, M) ≥ I and I1(S, N-1, M+1) < I, the next step is performed.

When one of the cables 100 is laid over a long distance, it will be routed to different regions and environments, and the current carrying capacity will be changed by the installation conditions, and there is a bottleneck section where the current carrying capacity becomes less than the required one. The cable 100 includes at least a first segment and a second segment, and the total number of M and N on each segment is the same value, and M or N on the first segment and the second segment are different values. . When the cable 100 of the first segment is I1(S, N, M) < I under the second segment routing condition, at least one of the ends of the first segment of the preset length is disconnected during armoring. The second metal wire 22 splicing a single of the first metal wires 21 to the tail end of the disconnected second metal wire 22 to form a starting end of the second segment; when the first segment is the cable When the line 100 is I1(S, N-1, M+1)>I under the second segment routing rule, at least one of the first ends is disconnected at the end of the first segment of the preset length when armoring a metal wire 21 splicing a single of the second metal wires 22 to a tail end of the disconnected first metal wire 21 to form a starting end of the second segment; the cable 100 obtained simultaneously satisfies the multi-segment mounting The requirements for its current carrying capacity and mechanical strength under conditions.

Referring to FIG. 2, FIG. 3 and FIG. 4, in the embodiment, the cable 100 is provided with a first segment, a second segment, and a third segment, wherein: the first segment of the cable 100 is Under the first segment routing condition, I1(S,N,M)=I, where N:M=2:5; the first segment downloads the traffic in the second segment routing condition, I1(S,N,M) <I, under the premise that the total number of M and N is constant, after the design is improved, N: M = 3: 4, I1 = I, and 8 pieces are disconnected by the end of the first segment of the preset length on the cable 100. The second metal wire 21 splices a single of the first metal wires 21 to a tail end of a single second metal wire 22 to form a beginning of a second segment of a predetermined length on the cable 100 ; the first segment is under the third segment routing condition I1(S, N-1, M+1) >I, under the premise that the total number of M and N is constant, after design improvement N: M = 1:6, I1 = I, disconnected by the end of the second segment of the preset length on the cable 100. Rooting the first metal wire 21, splicing a single of the second metal wires 22 to a single end of the first metal wire 21 to form a third segment of the cable 100 having a predetermined length The beginning. The same cable 100 can simultaneously meet the requirements of the first segment, the second segment, and the third segment of the preset length for the current carrying capacity.

In other embodiments, the first segment may have a higher current carrying capacity under the second segment routing condition than the first segment routing condition; the first segment, the second segment, and the third segment may have Any two of N:M are the same. The cable 100 may comprise two segments or more than three segments, and N:M has at least two different values under the premise that the total number of M and N is constant.

Step 4: pulling the N first metal wires 21 and the second metal wires 22 of the M wires to be arranged outside the circumference of the core 10 including the conductor, and performing twisting and armoring to form the cable 100 armor layer 20. An outer sheath 30 is disposed outside the armor layer 20 for mechanical protection and corrosion protection of the cable 100.

The conductor cross-sectional area, armor loss, and mechanical performance of the cable 100 obtained by the present invention are optimized, and the current carrying capacity satisfies the installation condition requirements; and the same cable 100 can simultaneously satisfy multiple installation conditions. Its current carrying capacity requirements.

The above embodiments are only used to describe the technical solutions of the embodiments of the present invention, and the embodiments of the present invention are described in detail with reference to the preferred embodiments. The modifications and equivalents of the embodiments are not to be construed as a departure from the spirit and scope of the invention.

Claims

A method of armoring a cable, the cable comprising a conductor, comprising the steps of:

Step 1: According to the installation condition, the current carrying capacity requirement value is I, the conductor cross-sectional area S=S1 is set, and the N first metal wires and the M second metal wires for armoring are provided;

Step 2: Calculating the current carrying capacity as I1 according to the first metal wire of S1, N and the second metal wire of M;

Step 3: Comparing I1 and I, when I1(S, N, M) ≥ I and I1(S, N-1, M+1) < I, proceed to the next step;

Step 4: The N first metal wires and the M second metal wires are drawn and arranged outside the circumference of the core including the conductor, and the armor layer of the cable is formed.
The cable mounting method according to claim 1, wherein the step (3) comprises:

When I1 (S1, N = 0, M = Mmax1) > I, return to step 1, reset the conductor cross-sectional area S is S2, S2 < S1;

When I1 (S1, N = 0, Mmax1) < I and I1 (S1, Nmax1, M = 0) < I, return to step one, reset the conductor cross-sectional area S is S3, S3> S1;

When I1(S, N=0, Mmax)<I and I1(S, Nmax-1, M=1)>I, returning to step 1, resetting the number N of the first metal lines to N1 and The number M of the second metal line is M1, where N1>0, M1>1;

When I1(S, N1-1, M1+1)>I, returning to step 1, resetting the number N of the first metal lines to N2 and the number M of the second metal lines to M2, wherein M2>M1, M2+N2=M1+N1;

When I1(S, N1, M1) < I, returning to step 1, resetting the number N of the first metal lines to N3 and the number M of the second metal lines to M3, where N3>N1, M3+N3=M1+N1.
The cable mounting method according to claim 1, wherein said cable includes at least a first segment and a second segment, and the total number of M and N on each segment is the same value. M or N on the first segment and the second segment are different values.
The armoring method of a cable according to claim 3, characterized in that: Disconnecting at least one of the second metal wires at an end of the first segment of the preset length, splicing a single of the first metal wires to a tail end of the disconnected second metal wire to form a second The beginning of the segment.
The cable mounting method according to claim 3, wherein at least one of said first metal wires is disconnected at an end of said first segment of a predetermined length during armoring, said single said A second metal wire is spliced to the broken end of the first metal wire to form a beginning of the second segment.
The cable mounting method according to claim 3, wherein the cable satisfies the requirements of the rated current and the mechanical strength of the multi-segment routing condition.
The method of armoring a cable according to claim 3, wherein each of said first metal wires is a circular or flat copper wire or an aluminum wire.
The armoring method of a cable according to claim 3, wherein each of said second metal wires is a round wire or a flat wire.
The method of armoring a cable according to claim 3, wherein an outer sheath is disposed outside the armor layer.