CN111341490A - Optical fiber composite high-voltage cable with built-in humidity sensor - Google Patents

Optical fiber composite high-voltage cable with built-in humidity sensor Download PDF

Info

Publication number
CN111341490A
CN111341490A CN202010211412.5A CN202010211412A CN111341490A CN 111341490 A CN111341490 A CN 111341490A CN 202010211412 A CN202010211412 A CN 202010211412A CN 111341490 A CN111341490 A CN 111341490A
Authority
CN
China
Prior art keywords
optical fiber
humidity
humidity sensor
cable
built
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010211412.5A
Other languages
Chinese (zh)
Inventor
郝艳棒
成延庭
陈云
阳林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
South China University of Technology SCUT
Original Assignee
South China University of Technology SCUT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by South China University of Technology SCUT filed Critical South China University of Technology SCUT
Priority to CN202010211412.5A priority Critical patent/CN111341490A/en
Publication of CN111341490A publication Critical patent/CN111341490A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/005—Power cables including optical transmission elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
    • G01D5/35309—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer
    • G01D5/35316—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer using a Bragg gratings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
    • G01K11/322—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres using Brillouin scattering
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H01B7/0208—Cables with several layers of insulating material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/021—Features relating to screening tape per se

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

The invention discloses an optical fiber composite high-voltage cable with a built-in humidity sensor, which comprises a cable body, wherein the cable body comprises a water-blocking tape layer and at least one humidity sensor optical fiber, and the water-blocking tape layer is arranged in the cable body; at least one humidity sensor optical fiber is arranged outside the water-blocking tape layer along the axial direction of the cable body, and the humidity sensor optical fiber is used for detecting the humidity inside the cable body. The invention has good electrical and mechanical properties and sensitive sensing characteristics by the built-in humidity sensor optical fiber, and the humidity sensor optical fiber is arranged on the metal shielding layer and can not distort the electric field distribution in the cable. Can monitor the humidity on the band layer that blocks water through humidity transducer fiber optic cable ware real-time supervision in long-term operation, monitor the humidity factor that influences the normal steady operation of cable, improve the operational reliability, provide powerful support for constructing electric power thing networking perception layer.

Description

Optical fiber composite high-voltage cable with built-in humidity sensor
Technical Field
The invention relates to a cable in the research field of power transmission equipment, in particular to an optical fiber composite high-voltage cable with a built-in humidity sensor.
Background
At present, with the continuous development of economic society, compared with overhead transmission lines, the crosslinked polyethylene cable has the advantages of being beneficial to city beautification, low in failure rate and the like, and is widely applied to city network reconstruction. The power cable is laid at the bottom of the ground and is easily damaged by external force such as municipal engineering and the like to cause moisture intrusion. In order to prevent insulation from generating water branches due to damp, a cable buffer layer is commonly used as a longitudinal water-blocking structure for the high-voltage cable. However, researches in recent years find that after the cable runs for a long time in southern coastal areas and the like, the buffer layer defect is easy to occur, unclear white powder appears on the surface of the semi-conductive water blocking tape, the insulating shielding layer is ablated, and even the insulating layer is ablated to cause faults. The defects are related to the degree of moisture of the cable, the surface resistance and the volume resistivity of the semi-conductive buffer water-blocking tape of the defective cable are increased, good electrical connection between the cable inner sheath and the insulating shielding layer is not facilitated, and normal and stable operation of the cable is influenced. The power cable buffer layer humidity parameter is monitored on line, the real-time reflection of the cable running environment is facilitated, and a differential operation and maintenance strategy is formulated according to the moisture degree.
Currently common humidity sensors are classified into conventional type, electrolyte type, ceramic type and polymer type humidity sensors. Among the first three sensors, the traditional humidity sensor has poor measurement accuracy, the electrolyte humidity sensor has poor stability and poor wet hysteresis, and the ceramic humidity sensor has low sensitivity and large size and is not suitable for on-line monitoring of the humidity of the power cable. The polymer sensor can be classified into an electrical characteristic sensor and an optical characteristic sensor according to different variation parameters, wherein the electrical characteristic polymer sensor is susceptible to environmental factors and has poor stability. The polymer sensor with optical characteristics is generally used in the fields of aerospace, ships, biomedicine, engineering structure safety detection and the like, and is not used in power cables.
Disclosure of Invention
The invention aims to solve at least one technical problem in the prior art, and provides an optical fiber composite high-voltage cable with a built-in humidity sensor, which can monitor the operation humidity inside the cable in real time through an optical fiber of the humidity sensor and provide a theoretical basis for differential operation and maintenance management.
According to an embodiment of the first aspect of the present invention, there is provided an optical fiber composite high voltage cable with a built-in humidity sensor, including a cable body, wherein the cable body includes:
the water blocking tape layer is arranged in the cable body;
and the humidity sensor optical fiber is arranged outside the water blocking tape layer along the axial direction of the cable body and is used for detecting the humidity inside the cable body.
The optical fiber composite high-voltage cable with the built-in humidity sensor according to the embodiment of the first aspect of the invention further comprises a temperature sensor optical fiber arranged beside the humidity sensor optical fiber, wherein the temperature sensor optical fiber and the humidity sensor optical fiber are arranged in parallel.
According to the optical fiber composite high-voltage cable with the built-in humidity sensor, according to the embodiment of the first aspect of the invention, the metal shielding layer is arranged on the outer surface of the water blocking tape layer, and the humidity sensor optical fiber and the temperature sensor optical fiber are arranged in the metal shielding layer.
According to the optical fiber composite high-voltage cable with the built-in humidity sensor, the metal shielding layer is internally provided with a plurality of metal wires which are arranged at intervals along the circumferential direction, and at least one metal wire is arranged between the humidity sensor optical fiber and the temperature sensor optical fiber.
According to the optical fiber composite high-voltage cable with the built-in humidity sensor, the metal shielding layer further comprises a metal tape wound on the outer surface of the metal wire, and the metal tape is used for fixing the metal wire, the humidity sensor optical fiber and the temperature sensor optical fiber.
According to the optical fiber composite high-voltage cable with the built-in humidity sensor, the metal wire can be one or more of a copper wire, an aluminum wire, a lead wire and a low-carbon steel wire.
According to the optical fiber composite high-voltage cable with the built-in humidity sensor, the temperature sensor optical fiber comprises a temperature sensor optical fiber core, a temperature sensor optical fiber cladding and a temperature sensor optical fiber protection layer which are arranged in sequence from inside to outside, and a plurality of temperature optical fiber grid regions are arranged in the temperature sensor optical fiber core.
According to the optical fiber composite high-voltage cable with the built-in humidity sensor, the humidity sensor optical fiber comprises a humidity sensor optical fiber core, a humidity sensor optical fiber cladding and a humidity sensor optical fiber protection layer which are sequentially arranged from inside to outside, a plurality of humidity optical fiber grid regions are arranged in the humidity sensor optical fiber core, and a humidity-sensitive coating is coated on the outer surface of the humidity optical fiber grid region in the humidity sensor optical fiber core.
According to the optical fiber composite high-voltage cable with the built-in humidity sensor, the humidity-sensitive coating is one or more of a polyimide layer, an epoxy-phenolic resin layer and a carbon fiber composite material layer.
According to the optical fiber composite high-voltage cable with the built-in humidity sensor, the water blocking tape layer is formed by adding high-molecular water blocking powder between two layers of non-woven fabrics.
The invention has the beneficial effects that: the invention has good electrical and mechanical properties and sensitive sensing characteristics by the built-in humidity sensor optical fiber, and the humidity sensor optical fiber is arranged on the metal shielding layer and can not distort the electric field distribution in the cable. Can monitor the band layer humidity of blocking water through humidity transducer optic fibre real-time supervision in the long-term operation, monitor the humidity factor that influences the normal steady operation of cable, improve the operational reliability, provide powerful support for constructing electric power thing networking perception layer.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures are only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from them without inventive effort.
FIG. 1 is a cross-sectional view of an embodiment of the present invention;
FIG. 2 is a schematic view of an optical fiber of a humidity sensor in an embodiment of the present invention;
FIG. 3 is a schematic view of an optical fiber of a temperature sensor in an embodiment of the present invention;
FIG. 4 is a flow chart illustrating the fabrication of an optical fiber for a humidity sensor in accordance with an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1-2, an optical fiber composite high-voltage cable with a built-in humidity sensor comprises a cable body, wherein the cable body comprises a conductor 1 positioned in the center of the cable, after a semiconductive conductor shielding layer 2, an insulating layer 3 and an insulating shielding layer 4 are extruded outside the conductor 1 in a three-layer co-extrusion manner, the conductor 1, the semiconductive conductor shielding layer 2, the insulating layer 3 and the insulating shielding layer 4 jointly form a cable insulating core; a water-blocking tape layer 5 is wrapped outside the insulating wire core; the method comprises the following steps of laying metal wires outside a water-blocking tape layer 5 at intervals in the circumferential direction to serve as a metal shielding layer 6, placing at least one humidity sensor optical fiber 71 in the metal shielding layer 6, axially arranging the humidity sensor optical fiber 71 in a cable body, coating an inner sheath 8 outside the metal shielding layer 6, coating an anticorrosive layer 9 outside the inner sheath 8, and extruding an outer sheath 10 outside the anticorrosive layer 9. The humidity sensor optical fiber 71 is used for detecting the humidity inside the cable body. Specifically, the inner sheath 8 is a smooth lead sheath. The anticorrosive coating 9 is asphalt, the outer sheath 10 is polyethylene, and the water blocking tape layer is a semiconductive buffering water blocking tape layer formed by adding high-molecular water blocking powder between two layers of non-woven fabrics.
As shown in fig. 2, the humidity sensor optical fiber 71 includes a humidity sensor optical fiber core 711, a humidity sensor optical fiber cladding 712 and a humidity sensor optical fiber protection layer 713, which are sequentially disposed from inside to outside, a plurality of humidity optical fiber grid regions 710 are disposed in the humidity sensor optical fiber core 711, and a humidity sensitive coating 714 is coated on an outer surface of the humidity sensor optical fiber core 711 having the humidity optical fiber grid regions 710.
After the cable is damaged by external force and longitudinally seeps water in a joint or other modes, moisture invades the water blocking tape layer 5 to cause the expansion of the moisture sensitive coating 714, the moisture sensor optical fiber 71 generates axial strain stretching, the grating distance Λ in the moisture optical fiber grating area 710 is enlarged, the optical fiber transmission optical wavelength lambda changes accordingly, and as the Bragg wavelength drift amount and the moisture variation amount are in a linear relation, the moisture variation amount of the water blocking tape layer 5 can be obtained, so that the online moisture monitoring of the water blocking tape layer 5 is realized, and a theoretical basis is provided for differential operation and maintenance management in time.
Specifically, one of the manufacturing methods of the humidity sensor optical fiber 71 is as follows:
the single-mode optical fiber subjected to oxygen carrying treatment is etched by ultraviolet light penetrating through a mask plate to prepare an optical fiber Bragg grating, the optical fiber Bragg grating is a humidity optical fiber grating area 710, the length of the humidity optical fiber grating area 710 is 6-10 mm, the period is Λ, the single-mode optical fiber is placed on a manufacturing platform shown in figure 4, two ends of the single-mode optical fiber are connected with a traction motor 16 of the platform, the single-mode optical fiber is slowly drawn and sequentially passes through a pretreatment area 11, a coating area 12, a curing area 14 and a cooling area 15 in sequence, a humidity sensitive material is added on the surface of the humidity optical fiber grating area 710 which is carved in advance to form a humidity sensitive coating 714, and the coated humidity sensitive material is polyimide to prepare the humidity sensor optical fiber 71.
It should be noted that, in the preprocessing region 11, the moisture sensor optical fiber cladding 712 and the moisture sensor optical fiber protection layer 713 of the moisture optical fiber grid region 710 are corroded by a special hydrogen fluoride solution, the moisture sensor optical fiber core 711 is cleaned by alcohol after being exposed, and then the surface is preprocessed by a silane coupling agent solution. Polyimide solution is arranged in the coating area 12, and the humidity optical fiber grid area 710 is accurately coated by controlling the pulling device 13, so that the polyimide solution is uniformly distributed on the surface of the humidity optical fiber grid area 710. Three high temperature drying boxes are arranged in the curing area 14, the temperatures of the three high temperature drying boxes are 100 ℃, 166 ℃ and 280 ℃ in sequence, and the optical fiber which is coated in the coating area 12 is subjected to impurity volatilization, thin film curing treatment and thickness control by utilizing different temperatures. The ideal thickness of the moisture sensitive coating 714 is 30 μm. The lifting device consists of a traction motor, a telescopic lifting device, a rotating mechanism, a pincer type handle and the like, and is internally provided with an electronic control circuit which can operate the directional movement and the uniform periodic rotation of the optical fiber.
In some embodiments, a temperature sensor fiber 72 is further included and disposed adjacent to the humidity sensor fiber 71, the temperature sensor fiber 72 being disposed parallel to the humidity sensor fiber 71. The temperature sensor fiber 72 is used to compensate for wavelength changes of the humidity sensor fiber 71 caused by temperature and external stress extrusion changes.
In some embodiments, as shown in fig. 3, the temperature sensor fiber 72 includes a temperature sensor fiber core 721, a temperature sensor fiber cladding 722, and a temperature sensor fiber protection layer 723, which are sequentially disposed from inside to outside, and the temperature sensor fiber core 721 is provided with a plurality of temperature fiber grating regions 720 therein.
One method of making the temperature sensor fiber 72 is as follows:
and (3) etching the single-mode optical fiber subjected to oxygen carrying treatment by using ultraviolet light to penetrate through the mask plate to obtain the fiber Bragg grating, wherein the fiber Bragg grating is a temperature fiber grating region 720, the length of the temperature fiber grating region 720 is 6-10 mm, and the period is Λ.
In order to reduce errors, in the manufacturing process of the temperature sensor optical fiber 72 and the humidity sensor optical fiber 71, when grid regions are etched on the two optical fibers, the same distance between every two grid regions is ensured, and the positions of the grid regions on the humidity sensor optical fiber 71 and the temperature sensor optical fiber 72 are aligned one by one.
The specific principle is as follows:
the fiber bragg grating reflects the wavelength meeting the bragg condition, and the characteristic equation of the FBG is as follows from the coupled mode theory:
λB＝2neffΛ (1)
wherein λ isBIs FBG center wavelength, neffIs the effective refractive index of the grating, Λ is the period of the grating, and the change of physical quantity stress and temperature causes neffΛ, resulting in a central wavelength λBAnd (4) offsetting. By measuring the central wavelength shift DeltaLambdaBAnd obtaining the physical quantity to be measured.
The fiber Bragg grating laid in the cable is stressed and the temperature acts simultaneously, and the central wavelength offset Delta lambda can be known by elasticity mechanicsBCan be expressed as:
ΔλB＝λBKε·Δε+λBKT·ΔT (2)
Kε＝1-(1/2)·neff 2[P12-μ(P11+P12)](3)
KT＝(α+β) (4)
wherein, KεIs strain sensitivity; kTIs the temperature sensitivity; delta epsilon is the stress variation; Δ T is the temperature variation; p11、P12Is the material elasto-optic coefficient; mu is the Poisson's ratio of the optical fiber material; peFor the strain sensitivity coefficient, Pe＝(1/2)·neff 2[P12-μ(P11+P12)]α is thermo-optic coefficient, β is thermal expansion coefficient, the optical fiber used in the patent is common single-mode quartz optical fiber, and the thermo-optic coefficient is α approximately equal to 6.17 × 10-6/° c, coefficient of thermal expansion β ≈ 5 × 10-7/℃。
The humidity sensor optical fiber 71 is coated with a humidity sensitive material on the surface of the gate region, and the humidity sensitive material expands to cause strain after being wetted, so that the central wavelength shifts. The wavelength variation of the humidity sensor fiber 71 and the temperature sensor fiber 72 can be expressed as:
ΔλB71/λB71＝Kε71·Δε+KT71·ΔT+KM71·ΔY (5)
ΔλB72/λB72＝Kε72·Δε+KT72·ΔT (6)
wherein, KM71For sensitivity to humidity, KM71＝(1-Pe)ξMC1，ξMIs the coefficient of wet expansion, C, of the moisture-sensitive material1Related to the moisture sensitive material-optical fiber adhesion coefficient; Δ Y is the humidity change amount.
Since the core materials at the gates of the humidity sensor fiber 71 and the temperature sensor fiber 72 are the same, both have the same temperature response. Because the two grid regions are closely laid in parallel, the stress of the two grid regions is the same, and the stress variation is the same, which is obtained by the following formulas (5) to (6):
(ΔλB71/λB71)-(ΔλB72/λB72)＝KM71·ΔY (8)
the change in the wavelength of the humidity sensor optical fiber 71 and the temperature sensor optical fiber 72 is measured, and the humidity change amount Δ Y is obtained.
In some embodiments, the outer surface of the water blocking tape layer is provided with a metal shielding layer 6, and the humidity sensor optical fiber 71 and the temperature sensor optical fiber 72 are arranged in the metal shielding layer 6. The temperature sensor optical fiber 72 and the humidity sensor optical fiber 71 are arranged on the metal shielding layer 6, so that the electric field distribution in the cable can not be distorted, the mechanical performance of the cable is ensured to be good, the cable is not interfered by a magnetic field, and the service life of the cable is greatly prolonged.
In some embodiments, the metal shielding layer 6 has a plurality of circumferentially spaced wires therein, and at least one of the wires is disposed between the humidity sensor fiber 71 and the temperature sensor fiber 72. Specifically, as shown in fig. 1, a wire is disposed between the humidity sensor optical fiber 71 and the temperature sensor optical fiber 72 and then laid on the bottom of the cable. The humidity sensor optical fiber 71 and the temperature sensor optical fiber 72 need to be laid in close proximity, and since the distance between the two metal wires in the metal shielding layer 6 is limited, a metal wire is arranged between the two optical fibers to ensure that the two optical fibers have sufficient space and are not extruded mutually.
Specifically, on the premise of ensuring the normal work of the cable, the metal wire can be one or more of a copper wire, an aluminum wire, a lead wire, a low-carbon steel wire and the like according to actual production requirements.
Specifically, on the premise of ensuring the normal operation of the cable, the moisture sensitive coating 714 is one or more of a polyimide layer, an epoxy-phenolic resin layer and a carbon fiber composite material layer according to the actual production requirement.
In some embodiments, the metal shielding layer 6 further comprises a metal tape wound on the outer surface of the metal wire, and the metal tape is used for fixing the metal wire, the humidity sensor optical fiber 71 and the temperature sensor optical fiber 72. The metal wire, the humidity sensor optical fiber 71 and the temperature sensor optical fiber 72 are located in the same layer, the winding direction of the metal wire, the humidity sensor optical fiber 71 and the temperature sensor optical fiber 72 is the same, and the winding direction of the metal belt is different from that of the metal wire. Specifically, if the metal wire is wound in the right direction, the metal tape is wound in the left direction, and the humidity sensor optical fiber 71 and the temperature sensor optical fiber 72 are fixed while the metal tape tightens the metal wire.
Preferably, the metal shielding layer 6 is composed of concentric loosely wound soft copper wires, the surfaces of the copper wires are reversely tightened by copper strips, and the average gap between every two adjacent copper wires is not more than 4 mm. If the copper wire in the metal shielding layer 6 is wound in the right direction, the copper strip is wound in the left direction, the thickness of the copper strip is 0.5mm, and the width of the copper strip is 8 mm. The outer diameters of the humidity sensor optical fiber 71 and the temperature sensor optical fiber 72 are the same as the diameter of the copper wire, and the humidity sensor optical fiber 71 and the temperature sensor optical fiber 72 are fixed together when the copper wire is fastened and fixed by the copper belt.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.

Claims (10)

1. The utility model provides a compound high tension cable of optic fibre of built-in humidity transducer which characterized in that, includes the cable body, wherein, the cable body includes:
the water blocking tape layer is arranged in the cable body;
and the humidity sensor optical fiber is arranged outside the water blocking tape layer along the axial direction of the cable body and is used for detecting the humidity inside the cable body.
2. The optical fiber composite high-voltage cable with a built-in humidity sensor of claim 1, wherein: the temperature sensor optical fiber is arranged beside the humidity sensor optical fiber, and the temperature sensor optical fiber and the humidity sensor optical fiber are arranged in parallel.
3. The optical fiber composite high-voltage cable with a built-in humidity sensor of claim 2, wherein: the outer surface of the water blocking tape layer is provided with a metal shielding layer, and the humidity sensor optical fiber and the temperature sensor optical fiber are arranged in the metal shielding layer.
4. The optical fiber composite high-voltage cable with a built-in humidity sensor of claim 3, wherein: the metal shielding layer is internally provided with a plurality of metal wires which are arranged at intervals along the circumferential direction, and at least one metal wire is arranged between the humidity sensor optical fiber and the temperature sensor optical fiber.
5. The optical fiber composite high-voltage cable with a built-in humidity sensor of claim 4, wherein: the metal shielding layer further comprises a metal belt wound on the outer surface of the metal wire, and the metal belt is used for fixing the metal wire, the humidity sensor optical fiber and the temperature sensor optical fiber.
6. The optical fiber composite high-voltage cable with a built-in humidity sensor of claim 4, wherein: the metal wire can be one or more of a copper wire, an aluminum wire, a lead wire and a low-carbon steel wire.
7. The optical fiber composite high-voltage cable with a built-in humidity sensor of claim 2, wherein: the temperature sensor optical fiber comprises a temperature sensor optical fiber core, a temperature sensor optical fiber cladding and a temperature sensor optical fiber protective layer which are sequentially arranged from inside to outside, and a plurality of temperature optical fiber grating regions are arranged in the temperature sensor optical fiber core.
8. The optical fiber composite high-voltage cable with a built-in humidity sensor of claim 1, wherein: humidity transducer optic fibre includes from interior toward humidity transducer optic fibre sinle silk, humidity transducer optic fibre covering and the humidity transducer optic fibre protective layer that sets gradually outward, be equipped with a plurality of humidity fiber grating regions in the humidity transducer optic fibre sinle silk, the surface coating humidity sensitive coating that has humidity fiber grating region in the humidity transducer optic fibre sinle silk.
9. The optical fiber composite high-voltage cable with a built-in humidity sensor of claim 1, wherein: the humidity-sensitive coating is one or more of a polyimide layer, an epoxy-phenolic resin layer and a carbon fiber composite material layer.
10. The optical fiber composite high-voltage cable with a built-in humidity sensor of claim 1, wherein: the waterproof tape layer is formed by adding high-molecular waterproof powder between two layers of non-woven fabrics.
CN202010211412.5A 2020-03-24 2020-03-24 Optical fiber composite high-voltage cable with built-in humidity sensor Pending CN111341490A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010211412.5A CN111341490A (en) 2020-03-24 2020-03-24 Optical fiber composite high-voltage cable with built-in humidity sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010211412.5A CN111341490A (en) 2020-03-24 2020-03-24 Optical fiber composite high-voltage cable with built-in humidity sensor

Publications (1)

Publication Number Publication Date
CN111341490A true CN111341490A (en) 2020-06-26

Family

ID=71184487

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010211412.5A Pending CN111341490A (en) 2020-03-24 2020-03-24 Optical fiber composite high-voltage cable with built-in humidity sensor

Country Status (1)

Country Link
CN (1) CN111341490A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022165891A1 (en) * 2021-02-03 2022-08-11 江苏亨通高压海缆有限公司 Buffer layer wrapping and metal sheath welding linkage production line for high-voltage cable

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022165891A1 (en) * 2021-02-03 2022-08-11 江苏亨通高压海缆有限公司 Buffer layer wrapping and metal sheath welding linkage production line for high-voltage cable

Similar Documents

Publication Publication Date Title
CN201886828U (en) Photoelectric composite cable with temperature and stress distributively monitored at same time
US7085457B2 (en) Underground electrical cable with temperature sensing means
CN204881661U (en) Improve distributed optical fiber sensing system spatial resolution and positioning accuracy's optical fiber sensor
CN211906997U (en) Optical fiber composite high-voltage cable with built-in humidity sensor
CN111341490A (en) Optical fiber composite high-voltage cable with built-in humidity sensor
US6635828B2 (en) Composite electrical insulator including an integrated optical fiber sensor
CN103226171B (en) Method for monitoring electric cable current-carrying thermal effect redundancy
CN201765876U (en) Novel built-in fiber temperature measuring high-voltage crosslinked cable
CN207751606U (en) Reflection-type optical fiber temperature sensor
CA2435584A1 (en) Fiber optic transmission conductor and distributed temperature sensing of fiber optic transmission conductor
Hao et al. Method of quasi-distributed interface fiber Bragg gratings monitoring dry band arc on the moist pollution layer of composite insulators
Zhou et al. Temperature calculation and measurement on power cable conductor based on equivalent thermal circuit and BOTDA
CN213277581U (en) Intelligent medium-voltage photoelectric composite cable for rail transit
Dechun et al. The study of temperature measurement on optical fiber in OPGW based on stimulated Brillouin scattering
CN113917360A (en) Insulator leakage current optical detection device integrating temperature and humidity
CN107945981A (en) A kind of intelligent mariages circulating type monitoring temperature single-core cable based on fiber grating
CN104183328A (en) Carbon fiber core photoelectric composite self-temperature-measurement cable
JP4056038B2 (en) Snow sensor, snow meter and snow measurement method using optical fiber
CN211788354U (en) Intelligent monitoring traction cable for high-speed rail
CN111462956B (en) Production process of intelligent monitoring traction cable for high-speed rail and cable
CN220821147U (en) Distributed optical fiber temperature measurement cable
US4441309A (en) Zero torque helically wrapped cable
CN203118543U (en) Temperature monitoring control cable
CN218333241U (en) Concave-type framework superconducting cable structure based on photoelectric composite superconducting strip
CN219297983U (en) Bridge steel strand inhaul cable

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
CB03 Change of inventor or designer information

Inventor after: Hao Yanpeng

Inventor after: Cheng Yanting

Inventor after: Chen Yun

Inventor after: Yang Lin

Inventor before: Hao Yanbang

Inventor before: Cheng Yanting

Inventor before: Chen Yun

Inventor before: Yang Lin

CB03 Change of inventor or designer information