CN214669769U

CN214669769U - OPGW optical cable with cable strain monitoring function

Info

Publication number: CN214669769U
Application number: CN202120914437.1U
Authority: CN
Inventors: 罗毅; 李斯新; 曾启平
Original assignee: Sichuan Huiyuan Optical Communications Co Ltd
Current assignee: Sichuan Huiyuan Optical Communications Co Ltd
Priority date: 2021-04-29
Filing date: 2021-04-29
Publication date: 2021-11-09
Anticipated expiration: 2031-04-29

Abstract

The utility model discloses an OPGW optical cable with cable strain monitoring function, which comprises a stainless steel optical unit (1) for monitoring, a stainless steel optical unit (2) for communication and a plurality of aluminum-clad steel wires (3); the aluminum-clad steel wires (3) can be divided into two layers or three layers, including an inner layer, an outer layer and an outermost layer, and cover and protect the stainless steel optical unit (1) for monitoring and the stainless steel optical unit (2) for communication; the stainless steel optical unit (1) for monitoring is arranged at the central position of the OPGW optical cable; the stainless steel optical unit (2) for communication is arranged at the position of the inner layer, forms the inner layer with a plurality of aluminum-clad steel wires (3), and wraps the stainless steel optical unit (1) for monitoring at the central position; the outer layer wraps and covers the inner layer. The utility model takes light as sensing medium, anti-electromagnetic interference and accurate data measurement; the service life of the monitoring equipment is not influenced by severe environment, and the stability is high; the optical fiber in the OPGW optical cable erected by the line is used as the sensing optical fiber, and commercial communication network cost is not needed.

Description

OPGW optical cable with cable strain monitoring function

Technical Field

The utility model relates to an optical fiber composite ground wire technical field for power communication and power transmission especially relates to an OPGW optical cable with cable strain monitoring function.

Background

When an overhead power line is affected by severe environments, such as ice coating, strong wind, extreme cold and the like, the ground wire is stretched under the action of load, the sag is increased, cable strain is generated, flashover and short circuit easily occur to a power transmission line, and the load of a tower is increased. When the external load exceeds a certain limit, the ground wire can be broken, the iron tower and the connecting parts can be seriously damaged, even the tower can be inclined and collapsed, and the safe operation of the power transmission line can be seriously threatened. In order to grasp the running state of the power transmission line in real time, discover threats in early stage and eliminate hidden dangers, the online monitoring of the power transmission line becomes an important subject to which people pay attention.

At present, the online monitoring device for the strain of the power transmission line mainly analyzes the stress state of a wire through the relationship between the inclination angle of the wire and the weight of the wire or through an insulator hardware fitting and calculates the strain of a cable. However, the monitoring mode is limited by the distribution condition of the measuring points, and the stress and cable strain conditions of the whole power transmission line are difficult to master comprehensively; such monitoring devices generally employ electrical signal transmission and are susceptible to environmental and weather influences. In recent years, distributed optical fiber sensors can measure in a continuous space, and become hot spots of domestic and foreign research. Distributed optical fiber sensors mainly include two types, namely optical fiber sensors based on Raman scattering and optical fiber sensors based on Brillouin scattering. Fiber sensor technology based on Raman scattering is mature, but can only be used for measuring temperature at present; while fiber optic sensors based on brillouin scattering can be used for simultaneous measurement of temperature and strain. Because the Brillouin optical fiber sensing technology has the advantages of long sensing distance, electromagnetic interference resistance, high monitoring precision, easiness in forming a monitoring network and the like, people can be better guided to master the line stress change, the temperature and stress change rule of the lead is obtained, a scientific basis is provided for timely taking prevention and solution measures, and the loss caused by disasters is reduced to the greatest extent.

At present, there are 2 main implementation modes for simultaneously measuring temperature and strain by applying a Brillouin Optical fiber sensing technology, one of which is a Brillouin Optical Time Domain Reflector (BOTDR) technology; the other is the Brillouin Time domain analysis (BOTDA) technique.

Because the performances of the BOTDA such as the measurement distance and the measurement time are incomparable with those of the BOTDR, on-line monitoring research and industrialization of the BOTDA technology in the operation process of the OPGW line are developed by various companies, so that the technology is mature day by day and starts to be commercially used.

The design of the ordinary OPGW optical fiber mainly aims at communication, the strain limit of the optical fiber is generally 0.5-0.7%, the design needs a large additional load to enable the cable strain of the OPGW to reach the design value, the optical fiber in the OPGW can start to strain and be measured, data is fed back to monitor, and obviously, the measurement result is not timely for line monitoring and emergency response.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide an OPGW optical cable with cable strain monitoring function.

The purpose of the utility model is realized through the following technical scheme:

an OPGW optical cable with a cable strain monitoring function comprises a stainless steel optical unit for monitoring, a stainless steel optical unit for communication and a plurality of aluminum-clad steel wires; the plurality of aluminum-clad steel wires are divided into two layers, including an inner layer and an outer layer, and cover and protect the stainless steel optical unit for monitoring and the stainless steel optical unit for communication; the stainless steel optical unit for monitoring is arranged at the central position of the OPGW optical cable; the stainless steel optical unit for communication is arranged at the inner layer position, forms an inner layer with a plurality of aluminum clad steel wires, and wraps the stainless steel optical unit for monitoring at the central position; the outer layer wraps and covers the inner layer.

The aluminum-clad steel wires are distributed on the inner layer and the outer layer; the inner layer comprises a plurality of aluminum-clad steel wires and stainless steel optical units for monitoring; the outer layer comprises a plurality of aluminum clad steel wires.

The aluminum-clad steel wires can be further divided into three layers, and the outermost layer comprises a plurality of aluminum-clad steel wires.

The number of optical fiber cores in the stainless steel optical unit for monitoring is four, wherein two cores are used for real-time monitoring, and the other two cores are used for standby.

The optical fiber in the stainless steel optical unit for monitoring adopts a tightly-packed optical fiber or a bare optical fiber.

The strain limit in the stainless steel optical unit for monitoring is set to be 0.1% -0.15%, and the strain limit in the stainless steel optical unit for communication is set to be any value between 0.5% -0.7%.

The utility model has the advantages that:

1. the light is used as a sensing medium, so that the electromagnetic interference is resisted, and the data measurement is accurate;

2. a power supply unit is not needed on the power transmission line, any monitoring device is not added on the line tower, the equipment host is arranged in the machine room, the service life of the monitoring equipment is not influenced by severe environment, and the stability of the monitoring equipment is high;

3. the optical fiber in the OPGW optical cable erected by the line is used as the sensing optical fiber, so that the communication cost of a commercial communication network is not needed, the information is reliable, and the safety is high;

4. the monitoring distance is long, distributed monitoring is adopted, and load change and environment temperature monitoring of a whole line and a step by step can be realized.

Drawings

FIG. 1 is a block diagram of the present invention;

FIG. 2 is a structure diagram of a three-layer aluminum-clad steel wire OPGW optical cable;

in the drawings: 1-stainless steel optical unit for monitoring, 2-stainless steel optical unit for communication, 3-aluminum clad steel wire and 4-tightly-packed optical fiber.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 1, an OPGW optical cable having a cable strain monitoring function includes a stainless steel optical unit 1 for monitoring, a stainless steel optical unit 2 for communication, and a plurality of aluminum-clad steel wires 3; the plurality of aluminum-clad steel wires 3 are divided into two layers, including an inner layer and an outer layer, and cover and protect the stainless steel optical unit 1 for monitoring and the stainless steel optical unit 2 for communication; the stainless steel optical unit 1 for monitoring is arranged at the central position of the OPGW optical cable; the stainless steel optical unit 2 for communication is arranged at the position of an inner layer, forms the inner layer with a plurality of aluminum clad steel wires 3, and wraps the stainless steel optical unit 1 for monitoring at the central position; the outer layer wraps and covers the inner layer.

The aluminum-clad steel wires 3 are distributed on the inner layer and the outer layer; the inner layer comprises a plurality of aluminum-clad steel wires 3 and a stainless steel optical unit 1 for monitoring; the outer layer comprises a plurality of aluminum clad steel wires.

As shown in fig. 2, the plurality of aluminum-clad steel wires 3 may be further divided into three layers, and the outermost layer includes a plurality of aluminum-clad steel wires 3.

The number of the optical fiber cores in the stainless steel optical unit 1 for monitoring is four, wherein two cores are used for real-time monitoring, and the other two cores are used for standby.

The optical fiber in the stainless steel optical unit 1 for monitoring adopts a tightly-packed optical fiber or a bare optical fiber.

The strain limit of the stainless steel optical unit 1 for monitoring is set to be 0.1% -0.15%, and the strain limit of the stainless steel optical unit 2 for communication is set to be 0.5% -0.7% and can be set to be any value.

The utility model discloses a concrete implementation process is: according to the technical principle of BOTDA distributed optical fiber sensing, a special optical fiber is adopted as a sensor in an OPGW, and measurement is carried out completely along the length of the optical fiber by utilizing the linear relation of Brillouin frequency shift, temperature and strain. It is necessary to require that the optical fiber is immediately stressed to be strained when the OPGW cable is strained.

The strain state of the optical cable needs to be timely and effectively monitored, the strain limit for measuring the stress state of the OPGW is set to be 0.1-0.15%, so that the stress state of the OPGW can be monitored in real time when the OPGW is erected and starts to operate, the stress strain of the optical fiber is converted into an icing load through algorithm and software design, and a set of complete high-voltage line optical cable strain monitoring OPGW system is formed by combining temperature measurement of an optical fiber distributed temperature measurement technology.

The structure of the special OPGW for monitoring the optical cable strain is slightly different from the conventional OPGW, the optical fiber or the tightly packaged optical fiber 4 for monitoring the optical cable strain is arranged at the central position of the cable, the number of the optical fiber cores is 4-24, two cores or part of the optical fiber cores are used for real-time monitoring, and the other two cores or the rest optical fiber are reserved; the communication optical fiber is arranged in the inner layer to be twisted like the conventional OPGW and is used for optical fiber communication.

Data acquisition and processing: the BOTDA Brillouin optical fiber sensing analyzer is utilized to obtain the parameters of external loads (ice coating, wind power, high temperature, extreme cold and the like) through algorithm processing and analysis of strain and temperature parameters tested by the BOTDA, when the related loads exceed a set threshold value, the system can give an alarm and provide line operation and maintenance personnel with corresponding technical measures to prevent serious line accidents such as cable breakage, tower collapse and the like.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above, and it should be understood by those skilled in the art that the present invention is not limited by the above embodiments, but only by the description of the above embodiments and the description, without departing from the spirit and scope of the present invention, the present invention can also have various changes and modifications, and these changes and modifications all fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. An OPGW optical cable with a cable strain monitoring function is characterized by comprising a stainless steel optical unit (1) for monitoring, a stainless steel optical unit (2) for communication and a plurality of aluminum-clad steel wires (3); the aluminum-clad steel wires (3) are divided into two layers, including an inner layer and an outer layer, and cover and protect the stainless steel optical unit (1) for monitoring and the stainless steel optical unit (2) for communication; the stainless steel optical unit (1) for monitoring is arranged at the central position of the OPGW optical cable; the stainless steel optical unit (2) for communication is arranged at the position of the inner layer, forms the inner layer with a plurality of aluminum-clad steel wires (3), and wraps the stainless steel optical unit (1) for monitoring at the central position; the outer layer wraps and covers the inner layer.

2. An OPGW optical cable with cable strain monitoring function according to claim 1, characterized in that the aluminum-clad steel wires (3) are distributed in an inner layer and an outer layer; the inner layer comprises a plurality of aluminum-clad steel wires (3) and stainless steel optical units (1) for monitoring; the outer layer comprises a plurality of aluminum clad steel wires.

3. An OPGW optical cable with cable strain monitoring function according to claim 2, characterized in that the plurality of aluminum-clad steel wires (3) can be further divided into three layers, the outermost layer comprising a plurality of aluminum-clad steel wires (3).

4. The OPGW optical cable with cable strain monitoring function according to claim 1, wherein the number of optical fiber cores in the stainless steel optical unit (1) for monitoring is four, two of the optical fiber cores are used for real-time monitoring, and the other two optical fiber cores are spare.

5. An OPGW optical cable with cable strain monitoring function according to claim 1, characterized in that the optical fiber in the stainless steel optical unit (1) for monitoring adopts a tight-packed optical fiber or a bare optical fiber.

6. The OPGW optical cable with the cable strain monitoring function according to claim 1, wherein a strain limit in the stainless steel optical unit for monitoring (1) is set to be between 0.1% and 0.15%, and a strain limit in the stainless steel optical unit for communication (2) is set to be any value between 0.5% and 0.7%.