CN209945374U - Power cable water inlet sensing device based on stress enhancement structure - Google Patents
Power cable water inlet sensing device based on stress enhancement structure Download PDFInfo
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- CN209945374U CN209945374U CN201920767312.3U CN201920767312U CN209945374U CN 209945374 U CN209945374 U CN 209945374U CN 201920767312 U CN201920767312 U CN 201920767312U CN 209945374 U CN209945374 U CN 209945374U
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Abstract
The utility model discloses a power cable water inlet sensing device based on a stress enhancement structure, which comprises a sensing optical fiber, a water absorption expansion material and a stress enhancement structure; the inner layer is sensing optical fiber, the middle layer is water-absorbing expansion material tightly wrapping the inner layer optical fiber, and the outer layer is stress-enhanced structure. The sensing device is installed inside the cable, when water enters the cable, the water is absorbed and expanded by the middle layer material, the extrusion effect of the water absorption and expansion on the inner layer sensing optical fiber is enhanced under the constraint effect of the outer layer stress enhancement structure, the propagation characteristic of optical signals in the optical fiber is changed, and the online monitoring of the water entering condition inside the cable is realized through the analysis of the propagation characteristic of the optical signals. The utility model provides a sensing device adopts built-in mode, has promoted the sensitivity of monitoring and monitoring data's accuracy, provides the information support for cable run's fortune dimension.
Description
Technical Field
The utility model relates to a cable run on-line monitoring technology field, concretely relates to power cable sensing device that intakes based on stress enhancement structure.
Background
With the rapid development of economy and the rapid promotion of urban construction in China, the application of the power cable is more and more extensive. The cable has a multi-layer protective structure and should not contain moisture inside it after proper installation and laying procedures. However, in recent years, statistics on cable faults shows that most faulty cables generally have internal water inflow, so that the copper shielding layer and the cable core are corroded. The power cable intakes, can make the insulating layer produce the water tree, seriously reduces the insulation level of cable, intakes simultaneously and leads to inside metal corrosion, can lead to the cable to generate heat unusually, and both can shorten the life of cable greatly, cause huge potential safety hazard. At present, no relevant device and method for realizing online monitoring of water inflow of a running cable exist, after the water inflow of the cable, under the condition that insulation is intact, damage to the cable is a process which is slow in development, and when a water inflow problem is found, an inner conductor and a shielding layer are rusted seriously, so that the cable cannot be used continuously. Therefore, the power cable water inlet sensing device based on the stress enhancement structure is developed, the problem of cable water inlet is found in time, relevant measures are taken, and the device has great significance for ensuring the safety of a power transmission network and the reliability of power supply.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the above-mentioned defect among the prior art, provide a power cable sensing device that intakes based on stress enhancement structure. The sensing device can monitor the water inflow condition inside the operation cable in real time, can be installed in the inner layer structure of the cable in the cable production process as required, is suitable for various power cables with relevant requirements, solves the problem that the operation cable water inflow monitoring device and method are lacked at present, and can provide information support for operation and maintenance of a cable line by utilizing the device and the method.
The purpose of the utility model can be achieved by adopting the following technical scheme:
a power cable water inlet sensing device based on a stress enhancement structure comprises a sensing optical fiber 1, a water-absorbing expansion material 2 and a stress enhancement structure 3 which are tightly attached from inside to outside, wherein the inner layer is the sensing optical fiber 1, the middle layer is the water-absorbing expansion material 2 tightly wrapping the inner layer optical fiber, and the outer layer is the stress enhancement structure 3;
the stress enhancement structure 3 provides a channel for water to freely enter and exit, provides inward stress, restrains the water-absorbing expansion material, and enables the water-absorbing expansion material 2 in the middle layer to absorb water and then expand and extrude the inner sensing optical fiber 1 in an inward one-way mode under the constraint action of the outer stress enhancement structure, so that the inner sensing optical fiber is extruded by the inner sensing optical fiber 1 to generate deformation and increase, the propagation characteristic of optical signals in the inner sensing optical fiber 1 is changed, and the online monitoring of the water inlet condition in the cable is realized through the analysis of the optical fiber signal propagation characteristic.
Further, the water-absorbing expansion material 2 and the stress enhancement structure 3 wrap the sensing optical fiber 1 in a full-section or segmented mode, and the length of each segment is adjusted according to actual needs.
Further, the sensing optical fiber 1 is an optical fiber with an optical fiber sensing unit or an optical cable-like structure with a sheath.
Further, the water-absorbing swelling material 2 adopts hydrophilic rubber as a material.
Further, the water-absorbing swelling material 2 is cylindrical.
Further, the stress enhancement structure 3 is a porous structure with high mechanical strength, and tightly wraps the middle layer water-absorbing expansion material 2.
Further, the aperture size and the density of the stress enhancement structure 3 are adjusted according to actual needs.
Outer stress enhancement structure 3 makes things convenient for the free business turn over of moisture and provides the internal stress, guarantees that the one-way inflation extrusion inlayer sensing fiber 1 of inside behind the water-absorbing expansion material 2 water absorption in intermediate level, and the reinforcing is to the extrusion effect of inlayer sensing fiber 1 behind the water-absorbing expansion to avoid it to destroy the cable structure outside the inflation, act as armor protection architecture for sensing fiber 1 simultaneously.
The sensing device is placed in the internal structure of the cable to be tightly attached to the cable in the production process of the cable, when water enters the cable, the middle water-absorbing expansion material enables the optical fiber unit of the inner layer to be deformed due to extrusion stress, so that the propagation characteristics of optical signals in the sensing optical fiber of the inner layer are changed, and the on-line monitoring of the water entering condition in the cable is realized by analyzing the propagation characteristics of the optical signals.
Furthermore, the sensing device is suitable for power cables including submarine cables, land cables and single-core and three-core cables, and is placed in the cables in a spiral winding mode or in a linear mode along the axial direction of the cables according to process requirements.
The utility model discloses for prior art have following advantage and effect:
1) the utility model discloses a device and method that monitoring power cable intake have realized the function to the inside condition real-time supervision of intaking of cable to can real time monitoring power cable's running state, avoided because the emergence that leads to the inside short circuit of cable overheated accident such as burning out of intaking, promoted the efficiency that the cable fortune maintained and overhauls.
2) Based on the utility model discloses well sensing device's structural feature, outer stress enhancement structure enables moisture freely to pass in and out sensing device, and the intermediate level expanding material that absorbs water expands after moisture gets into, receives the constraint effect of outer high mechanical strength stress enhancement structure, and the intermediate level absorbs water and extrudes inlayer optic fibre to interior one-way inflation, and the sensitivity of intaking is guaranteed to the extrusion effect to inlayer optic fibre after the reinforcing expansion that absorbs water to avoid its outside inflation to destroy cable structure, acts as armor protection architecture for optic fibre simultaneously.
3) Based on the utility model discloses well built-in sensing device's mounted position and structural feature can be according to the built-in each layer of installing in power cable inside of practical application needs to the mode of spiral coiling or place along cable axial straight line, constitute and seal the integral type structure, guarantee optic fibre and cable inner structure's in close contact with, avoid external disturbance, effectively protected sensing device simultaneously.
Drawings
Fig. 1 is a three-dimensional view of a power cable water inlet sensing device structure based on a stress enhancement structure disclosed in the present invention;
fig. 2 is a structural three-dimensional diagram of a power cable water inlet sensing device based on a stress enhancement structure, in which a middle water-absorbing expansion layer and an outer stress enhancement structure are wrapped in sections;
fig. 3 is a cross-sectional view of a power cable water inlet sensing device based on a stress enhancement structure installed in a single core cable filling layer as disclosed in the present invention;
fig. 4 is a three-dimensional view of a power cable water inlet sensing device based on a stress enhancement structure disclosed in the present invention, which is installed in a single core cable by using a spiral winding manner;
fig. 5 is a three-dimensional diagram of a power cable water inlet sensing device based on a stress enhancement structure, which is disclosed in the utility model, installed in a single core cable by adopting a straight line placement mode.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. In the description of the specific embodiment of the present invention, the sensing device for monitoring the water inflow of the cable is applied to the single-core cable filling layer as an example, which is only for convenience of description, and the description is simplified, which does not mean that the present invention is only applicable to a specific cable specification and a specific installation position, and can not be understood as a limitation of the present invention.
Examples
As shown in fig. 1, the embodiment discloses a power cable water inlet sensing device based on a stress enhancement structure, which includes a sensing optical fiber 1, a water-absorbing expansion material 2 and a stress enhancement structure 3, wherein the three layers are tightly attached to form the water inlet sensing device. The sensing device is placed in the internal structure of the cable to be tightly attached to the cable in the production process of the cable, when water enters the cable, the middle water-absorbing expansion material 2 enables the sensing optical fiber 1 on the inner layer to be deformed due to extrusion stress, so that the propagation characteristic of optical signals in the sensing optical fiber 1 on the inner layer is changed, and the online monitoring of the water entering condition inside the cable is realized through the analysis of the signal propagation characteristic of the sensing optical fiber 1.
The sensing optical fiber 1 is an optical fiber with an optical fiber sensing unit or an optical cable-shaped structure with a sheath;
wherein, the middle layer of the sensing device is made of water-absorbing swelling material 2 including hydrophilic rubber. The middle layer water-absorbing expansion material 2 can be processed into a cylindrical or other shape structure according to the requirement, and the inner layer optical fiber is tightly wrapped.
Wherein, the stress enhancement structure 3 is a porous structure with high mechanical strength, tightly wraps the middle layer water-absorbing expansion material 2, and the pore size and the density of the stress enhancement structure can be adjusted according to actual needs. Outer stress enhancement structure 3 makes things convenient for the free business turn over of moisture and provides the internal stress, guarantees that the one-way inflation extrusion inlayer sensing fiber 1 of inside behind the water-absorbing expansion material 2 water absorption in intermediate level, and the reinforcing is to the extrusion effect of inlayer optic fibre after the water-absorbing expansion to avoid it to destroy the cable structure outside the inflation, act as armor protection architecture for optic fibre simultaneously.
As shown in fig. 2, the middle layer water-swelling material 2 and the outer layer stress-reinforcing structure 3 of the monitoring device can be wrapped around the inner layer sensing optical fiber 1 in a full-section or segmented manner as required, and the length of each segment can be adjusted as required.
The sensing device is suitable for power cables including submarine cables, land cables and single-core and three-core cables, is not limited in installation position in the cables, and can be installed on parts such as a filling layer and a cable core conductor of the cables according to actual needs. As shown in fig. 3, taking the application of the sensing device for monitoring water inflow of a cable to a single-core cable filling layer as an example, the sensing device includes a sensing optical fiber 1, a water-absorbing expansion material 2 and a stress enhancement structure 3, and the cable sequentially includes a cable core conductor 4, an insulating inner shielding layer 5, an insulating layer 6, an insulating outer shielding layer 7, a filling layer 8, an aluminum sheath layer 9 and an outer sheath layer 10 from inside to outside.
As shown in fig. 4 and 5, the sensing device can be placed in a spirally wound manner or in a linear manner along the axial direction of the cable according to the process requirements.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (8)
1. A power cable water inlet sensing device based on a stress enhancement structure is characterized by comprising sensing optical fibers, a water absorption expansion material and a stress enhancement structure which are tightly attached from inside to outside, wherein the inner layer is the sensing optical fibers, the middle layer is the water absorption expansion material tightly wrapping the inner layer optical fibers, and the outer layer is the stress enhancement structure;
the stress enhancement structure provides a channel for the free inlet and outlet of water and provides inward stress to restrain the water-absorbing expansion material; under the constraint action of the outer stress enhancement structure, the water-absorbing expansion material in the middle layer absorbs water and then expands and extrudes the inner sensing optical fiber in one direction to enable the inner sensing optical fiber to be extruded to generate deformation and increase, so that the propagation characteristic of optical signals in the inner sensing optical fiber is changed, and the on-line monitoring of the water inlet condition inside the cable is realized by analyzing the propagation characteristic of the optical signals.
2. The power cable water inflow sensing device based on the stress enhancement structure as claimed in claim 1, wherein the water-swellable material and the stress enhancement structure are wrapped around the sensing fiber in a full-segment or segmented manner, and the length of the segment is adjusted according to actual needs.
3. The power cable water intake sensing device based on the stress enhancement structure of claim 1, wherein the sensing optical fiber is an optical fiber with an optical fiber sensing unit or a cable-like structure with a sheath.
4. The power cable water intake sensing device based on the stress enhancement structure of claim 1, wherein the water-swellable material is a water-swellable material including hydrophilic rubber.
5. The power cable water intake sensor device based on the stress enhancement structure of claim 1, wherein the water-swellable material is cylindrical.
6. The power cable water intake sensing device based on the stress enhancement structure of claim 1, wherein the stress enhancement structure is a porous structure with high mechanical strength, and is tightly wrapped with a water-swelling material in the middle layer.
7. The power cable water intake sensing device based on the stress enhancement structure of claim 1, wherein the pore size and density of the stress enhancement structure are adjusted according to actual needs.
8. The power cable water inflow sensing device based on the stress enhancement structure as claimed in claim 1, wherein the sensing device is suitable for power cables including submarine cables, terrestrial cables, and single-core and three-core cables, and is placed in a spiral winding manner or in a straight line manner along the axial direction of the cable according to the process requirements.
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| CN201920767312.3U CN209945374U (en) | 2019-05-27 | 2019-05-27 | Power cable water inlet sensing device based on stress enhancement structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110132325A (en) * | 2019-05-27 | 2019-08-16 | 华南理工大学 | A kind of power cable water inlet sensing device based on stress enhancing structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110132325A (en) * | 2019-05-27 | 2019-08-16 | 华南理工大学 | A kind of power cable water inlet sensing device based on stress enhancing structure |
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