CN115855673A - Submarine optical cable testing method and device, storage medium and electronic equipment - Google Patents
Submarine optical cable testing method and device, storage medium and electronic equipment Download PDFInfo
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- CN115855673A CN115855673A CN202211649593.5A CN202211649593A CN115855673A CN 115855673 A CN115855673 A CN 115855673A CN 202211649593 A CN202211649593 A CN 202211649593A CN 115855673 A CN115855673 A CN 115855673A
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Abstract
The invention discloses a method and a device for testing an undersea optical cable, a storage medium and electronic equipment, wherein the method comprises the following steps: applying different N water pressures in N sealed cavities where N sections of optical cables in the submarine optical cables are placed, wherein each section of optical cable in the N sections of optical cables is located in a corresponding sealed cavity in the N sealed cavities, one water pressure corresponding to the N water pressures is applied in each sealed cavity in the N sealed cavities, the water pressures applied in the sealed cavities are different, and the submarine optical cables penetrate through a target sealed container; applying a target voltage to the submarine optical cable through the target connecting piece, wherein the target voltage is a voltage required for maintaining the submarine optical cable to work at the target water depth within a preset time period; in the event that the undersea optical fiber cable is not broken down within a preset time period, it is determined that the undersea optical fiber cable is allowed to operate at the target water depth. By adopting the technical scheme, the problem that the reliability of the submarine optical cable in the practical application environment cannot be verified in the related technology is solved.
Description
Technical Field
The invention relates to the technical field of submarine optical cables, in particular to a submarine optical cable testing method and device, a storage medium and electronic equipment.
Background
Submarine optical cables, as an important means of communication technology, bear nearly 95% of communication services and are the main carrier of global information communication. In the related art, for a long-length transoceanic submarine optical cable communication system, a relay submarine optical cable system is generally adopted, but with the increase of submarine optical cable communication distance, communication capacity and the like, the voltage level of operation on a submarine optical cable is higher and higher, for example, up to 15kV, even 20kV, and meanwhile, the application water depth of the submarine optical cable reaches 8000m and a super-large water depth. The submarine optical cable needs to stably operate for 25 years under the condition, which puts extremely strict requirements on the reliability of the submarine optical cable, and once a fault occurs, the whole system cannot work, and huge maintenance cost is brought. Thus, verification of the reliability of the undersea optical fiber cable becomes particularly important.
In the related art, tests specified in relevant standards of submarine optical cables are usually adopted for submarine optical cable reliability verification, tests for submarine optical cables in the existing relevant standards of submarine optical cables, such as GB/T18480-2001, ITU-TG.976-2014, ITU-T G.978-2010, YD/T2283-2020 and the like, are divided into physical properties, mechanical properties, environmental properties and electrical properties, and each test adopts a single sample for testing. In the practical engineering application process of the submarine optical cable, the submarine optical cable firstly needs to bear the conditions of torsion, tension, bending and the like caused by production, manufacturing, guide cable delivery, construction and arrangement, and simultaneously needs to bear the ultra-high water pressure condition in the deep sea environment, and long-term high-voltage power supply is carried out.
Meanwhile, the submarine optical cable line generally comprises a submarine optical cable joint box and a submarine optical cable factory joint, and the submarine optical cable joint box and the submarine optical cable factory joint are not included in the submarine optical cable test in the existing relevant standards, so that the submarine optical cable line condition under the actual engineering application condition cannot be completely simulated, and the technical problem that the reliability of the submarine optical cable in the actual application environment cannot be verified is caused.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a testing method and device for an undersea optical cable, a storage medium and electronic equipment, which at least solve the problem that the reliability of the undersea optical cable in an actual application environment cannot be verified.
According to an aspect of an embodiment of the present invention, there is provided a method for testing an undersea optical cable, including: applying different N water pressures in N sealed cavities in which N sections of optical cables in the submarine optical cables are placed, wherein the N sealed cavities are obtained by dividing an integral sealed cavity in a target sealed container, each section of optical cable in the N sections of optical cables is located in a corresponding sealed cavity in the N sealed cavities, a corresponding water pressure in the N water pressures is applied in each sealed cavity in the N sealed cavities, the water pressures applied in the sealed cavities are different, the submarine optical cable penetrates through the target sealed container, the head end and the tail end of the submarine optical cable are placed outside the target sealed container, the head end and the tail end of the submarine optical cable are connected through a target connecting piece, and N is a positive integer greater than or equal to 2; applying a target voltage to the submarine optical cable through the target connecting piece, wherein the target voltage is a voltage required for maintaining the submarine optical cable to work at the target water depth within a preset time period; in the event that the undersea optical fiber cable is not broken down within a preset time period, it is determined that the undersea optical fiber cable is allowed to operate at the target water depth.
Alternatively, the water pressure applied to each of the N seal cavities increases in the direction from the leading end to the trailing end, or increases in the direction from the trailing end to the leading end.
Optionally, the applying different N water pressures in the N sealed cavities in which the N lengths of optical cables in the submarine optical cable are placed includes: under the condition that a jth sealing ring is arranged between a jth sealing cavity and a jth +1 sealing cavity in the N sealing cavities, a jth water pressure in N water pressures is exerted in the jth sealing cavity, and a jth +1 water pressure in the N water pressures is exerted in the jth +1 sealing cavity, wherein j is a positive integer which is greater than or equal to 1 and smaller than N, and the maximum pressure allowed to be borne by the jth sealing ring is greater than the pressure generated by the jth +1 water pressure and the jth water pressure.
Optionally, before applying different N water pressures in the N sealed cavities in which the N lengths of the submarine optical fiber cables are placed, the method further includes: determining pressure generated by the j +1 th water pressure and the jth water pressure according to the diameter of the candidate sealing ring, the j +1 th water pressure and the jth water pressure; and under the condition that the maximum pressure allowed to be borne by the candidate sealing ring is greater than the pressure generated by the j +1 th water pressure and the jth water pressure, determining the candidate sealing ring as the jth sealing ring.
Optionally, after applying the target voltage to the undersea optical fiber cable through the target connection, the method further includes: obtaining attenuation indexes of optical fibers in the N sections of optical cables in a preset time period; determining that the undersea optical fiber cable is allowed to operate at the target water depth in a case where the attenuation index is less than or equal to a preset threshold value.
Optionally, before applying different N water pressures in the N sealed chambers in which the N lengths of submarine optical fiber cables are placed, the method further comprises: and determining to apply different N water pressures in the N sealed cavities according to the target water depth.
According to another aspect of the embodiments of the present invention, there is provided an undersea optical fiber cable testing apparatus including: the system comprises a target sealed container, a submarine optical cable and a target connecting piece; the N sections of optical cables in the submarine optical cable are placed in N sealed cavities in a target sealed container, and the head end and the tail end of the submarine optical cable are connected through a target connecting piece; the integral sealed cavity in the target sealed container is divided into N sealed cavities, the submarine optical cable comprises N sections of optical cables, and each section of optical cable in the N sections of optical cables is positioned in a corresponding sealed cavity in the N sealed cavities; the submarine optical cable penetrates through the target sealed container, the head end and the tail end of the submarine optical cable are arranged outside the target sealed container, and N is a positive integer greater than or equal to 2; the control device is used for applying different N water pressures in N sealed cavities in which N sections of optical cables in the submarine optical cable are placed, wherein the corresponding one of the N water pressures is applied in each sealed cavity of the N sealed cavities, and the water pressures applied in the sealed cavities are different; applying a target voltage to the submarine optical cable through the target connecting piece, wherein the target voltage is a voltage required for maintaining the submarine optical cable to work at the target water depth within a preset time period; in the event that the undersea optical fiber cable is not broken down within a preset time period, it is determined that the undersea optical fiber cable is allowed to operate at the target water depth.
According to yet another aspect of the embodiments of the present application, there is also provided a computer-readable storage medium having a computer program stored therein, wherein the computer program is configured to execute the above method for testing an undersea optical cable when running.
According to yet another aspect of embodiments of the present application, there is also provided a computer program product comprising computer programs/instructions which, when executed by a processor, implement the steps of the above-described method.
According to yet another aspect of the embodiments of the present application, there is also provided an electronic device, including a memory in which a computer program is stored and a processor configured to execute the method for testing an undersea optical cable by the computer program.
According to the embodiment provided by the application, different N water pressures are applied to the N sealing cavities in which the N sections of optical cables in the submarine optical cable are placed, the target voltage is applied to the submarine optical cable, so that the submarine optical cable application environment under the test condition is closer to the actual engineering application environment, whether the submarine optical cable is allowed to work at the target water depth or not is determined according to whether the submarine optical cable in the application environment under the test condition is broken down within the preset time period or not, the technical problem that the reliability of the submarine optical cable in the actual application environment cannot be verified in the related art is solved, and the technical effect of improving the reliability of the test result is achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic block diagram of an alternative method of testing an undersea optical fiber cable in accordance with an embodiment of the present invention;
FIG. 2 is a flow chart of an alternative method of testing an undersea optical fiber cable in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of an alternative staged hydraulic seal chamber according to an embodiment of the invention;
FIG. 4 is a schematic view of an alternative taper seal ring according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an alternative undersea optical fiber cable pull and twist test testing apparatus according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an alternative testing apparatus for a coil test and a tension bend test of an undersea optical fiber cable in accordance with an embodiment of the present invention;
FIG. 7 is a sample schematic view of an alternative undersea optical fiber cable under test according to an embodiment of the present invention;
FIG. 8 is a schematic illustration of the relationship between the different water pressures applied in adjacent chambers according to an alternative embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
According to an aspect of an embodiment of the present application, there is provided a method for testing an undersea optical fiber cable, including:
applying different N water pressures in N sealed cavities in which N sections of optical cables in the submarine optical cables are placed, wherein the N sealed cavities are obtained by dividing an integral sealed cavity in a target sealed container, each section of optical cable in the N sections of optical cables is located in a corresponding sealed cavity in the N sealed cavities, a corresponding water pressure in the N water pressures is applied in each sealed cavity in the N sealed cavities, the water pressures applied in the sealed cavities are different, the submarine optical cable penetrates through the target sealed container, the head end and the tail end of the submarine optical cable are placed outside the target sealed container, the head end and the tail end of the submarine optical cable are connected through a target connecting piece, and N is a positive integer greater than or equal to 2;
applying a target voltage to the submarine optical cable through the target connecting piece, wherein the target voltage is a voltage required for maintaining the submarine optical cable to work at the target water depth within a preset time period;
in the event that the undersea optical fiber cable is not broken down within a preset time period, it is determined that the undersea optical fiber cable is allowed to operate at the target water depth.
In the related technology, when the reliability of the submarine optical cable in an actual use environment is verified, a test water pressure P meeting requirements is usually applied in a sealed container in which the submarine optical cable is placed, when the test water pressure P is large (generally more than 20 MPa), under high water pressure, because one side of a sealing ring bears the test water pressure P, the other side of the sealing ring bears atmospheric pressure, and pressure difference between two sides forms transverse extrusion force on the sealing ring, the sealing ring is deformed, because the sealing ring is arranged in a sealing ring groove, the deformation is limited by the sealing ring groove, the deformation can only longitudinally extrude an insulating layer of the submarine optical cable, so that insulating plastic deformation is caused, the outer diameter of a cable core at a sealing part is reduced, so that the sealing deformation of a hydraulic sealing device is poor, even the sealing failure is caused, and meanwhile, the insulating plastic deformation also causes the reduction of the insulating property, so that a working condition simulation test fails; in addition, when the test water pressure P is too high, the stress concentration of the sealing ring is easily caused, so that the sealing ring is irreversibly damaged, and the sealing performance of the water pressure sealing device is poor or even the sealing performance is invalid.
In order to ensure the reliability of hydraulic sealing in the long-term working condition simulation test process and avoid the situations of insulation deformation and reduction of insulation performance caused in the hydraulic sealing process, the embodiment of the application provides the large-depth graded hydraulic sealing method.
As shown in fig. 1, assuming that the target sealed container is a high-pressure sealed container, and the high-pressure sealed container includes, but is not limited to, 6 staged sealed cavities, wherein 3 staged sealed cavities are located near the head end of the submarine cable, and the remaining 3 sealed cavities are located near the tail end of the submarine cable, and the submarine cable sequentially penetrates through the 6 staged sealed cavities in the high-pressure sealed container, and the method for testing the submarine cable is described below by taking the 3 staged sealed cavities near the head end of the submarine cable as an example.
The specific testing steps comprise:
s11, sequentially penetrating the submarine optical cable through the grading sealing cavities 1-3, sealing the submarine optical cable through sealing rings when the submarine optical cable penetrates through the grading sealing cavities, and sealing the grading sealing cavities by using the sealing rings in order to ensure that two sides of the sealing rings bear different water pressures simultaneously;
the schematic diagram of the stepped hydraulic sealing is shown in fig. 3, a sealing ring is used for sealing between adjacent stepped sealing cavities, and the sealing ring used may be, but is not limited to, a conical sealing ring as shown in fig. 4.
As shown in fig. 4, the diameter D of the first end of the conical sealing ring is larger than the diameter D of the second end, and for adjacent stepped seals, because the applied water pressure is different, in practical application, the first end is usually installed in the stepped sealing cavity with higher water pressure, and the second end is installed in the stepped sealing cavity at the bottom of the water pressure.
S12, gradingThe sealed cavities 1-3 apply water pressure P in sequence 3 、P 2 、P 1 ；
Wherein, P is a test water pressure, and the unit is megapascal (MPa), P may be, but is not limited to, a water pressure corresponding to the maximum application water depth of the kelp optical cable test system applied in the high-pressure sealed cavity, and P may be, but is not limited to, calculated by the following formula (1):
P＝k×98.0655×h×ρ (1)
wherein k is a water pressure coefficient and is a dimensionless parameter, and k is recommended to be more than or equal to 1 and less than or equal to 1.3; h is the maximum applicable water depth of the submarine optical cable system, and the unit is meter (m); ρ is the density of seawater, unit: grams per cubic centimeter (g/cm) 3 ) Usually 1.028 is taken, and usually P is more than 20MPa.
As an alternative example, the water pressure applied in each of the N sealed chambers increases in sequence from the head end to the tail end, or in sequence from the tail end to the head end.
As shown in fig. 1, the water pressure P sequentially applied to the stepped seal chambers 1 to 3 3 、P 2 、P 1 The water pressure P sequentially applied to the graded sealing cavities 4-6 is sequentially increased from the head end to the tail end of the submarine optical cable 3 、P 2 、P 1 Increasing in the direction from the trailing end of the undersea optical cable in the order, i.e. P 3 <P 2 <P 1 <P。
S13, applying a target voltage V to the submarine optical cable through the target connecting piece;
as shown in fig. 1, it is assumed that the head end and the tail end of the submarine optical cable are connected by a clamp, wherein the clamp has conductivity, and a voltage V is applied to the submarine optical cable by a high-voltage source, and a current I is applied to the submarine optical cable by a feedthrough transformer.
It should be noted that the target voltage V can be calculated by, but is not limited to, the following formula (2):
wherein, V 0 To workVoltage, in units of kilovolts (kV); n is a life index, is a dimensionless parameter and is less than or equal to 5; t is t 0 Design life, unit: day; t test time, unit: and (5) day.
S14, maintaining the target voltage V, the test water pressure P and the water pressure P applied to the grading sealed cavities 1-3 in a preset time period 3 、P 2 、P 1 Keeping the test result unchanged and obtaining the test result;
and S15, determining whether the submarine optical cable is allowed to work at the target water depth according to the test result.
For example, it is assumed that the target voltage V, the test water pressure P, and the water pressure P applied to each of the graded sealing chambers 1 to 3 are maintained within 30 days 3 、P 2 、P 1 Under the condition that the submarine optical cable is not broken down, the submarine optical cable is determined to be allowed to continuously work for a preset time at the water depth h corresponding to the test water pressure P, for example, the submarine optical cable continuously works for 25 years at the water depth 2500 m corresponding to the test water pressure 25 MPa.
It should be noted that, in the embodiment of the present application, the long-term operating voltage of the submarine fiber cable is verified by applying a high voltage (greater than the operating voltage) to the submarine fiber cable for a short period of time.
As another alternative implementation, in addition to determining whether the undersea optical fiber cable is allowed to operate at the target water depth by using whether the above-mentioned undersea optical fiber cable is broken down, the following method may be used:
obtaining attenuation indexes of optical fibers in the N sections of optical cables in a preset time period;
determining that the undersea optical fiber cable is allowed to operate at the target water depth in a case where the attenuation index is less than or equal to a preset threshold value.
Maintaining the target voltage V, the test water pressure P and the water pressure P applied to the grading sealed cavities 1-3 in a preset time period 3 、P 2 、P 1 It is also possible to determine whether the undersea optical cable is allowed to operate at the target water depth by testing whether the optical fibers of the undersea optical cable are normal, without change.
For example, under the above test conditions, if the attenuation of the optical fiber of the submarine optical cable does not vary by more than 0.1dB, it is determined that the submarine optical cable is allowed to continuously operate at a water depth of 2500 m for 25 years; otherwise, the water is not allowed to continuously work for 25 years at the water depth of 2500 m.
According to the embodiment provided by the application, different N water pressures are applied to the N sealing cavities in which the N sections of optical cables in the submarine optical cable are placed, the target voltage is applied to the submarine optical cable, so that the submarine optical cable application environment under the test condition is closer to the actual engineering application environment, whether the submarine optical cable is allowed to work at the target water depth or not is determined according to whether the submarine optical cable in the application environment under the test condition is broken down within the preset time period or not, the technical problem that the reliability of the submarine optical cable in the actual application environment cannot be verified in the related art is solved, and the technical effect of improving the reliability of the test result is achieved.
As an alternative example, applying different N water pressures in N sealed chambers in which N lengths of the undersea optical fiber cable are placed includes:
under the condition that a jth sealing ring is arranged between a jth sealing cavity and a jth +1 sealing cavity in the N sealing cavities, a jth water pressure in N water pressures is exerted in the jth sealing cavity, and a jth +1 water pressure in the N water pressures is exerted in the jth +1 sealing cavity, wherein j is a positive integer which is greater than or equal to 1 and smaller than N, and the maximum pressure allowed to be borne by the jth sealing ring is greater than the pressure generated by the jth +1 water pressure and the jth water pressure.
As shown in FIG. 3, assuming that the 1 st seal ring is arranged between the 1 st seal cavity and the second seal cavity, the maximum pressure allowed to be borne by the 1 st seal ring is P Material The 1 st stage sealing cavity applies water pressure P 3 Applying a water pressure P in the 2 nd stage sealing cavity 2 Wherein P is 3 <P 2 。
According to the embodiment, the water pressure applied to any adjacent sealing cavity is different, and therefore in the process of sealing the adjacent sealing cavities by the tapered sealing ring, in order to avoid deformation of the sealing ring caused by overlarge pressure difference between two sides of the tapered sealing ring, the tapered sealing ring with the compressive strength meeting the condition needs to be selected to seal the grading sealing cavity.
As an alternative example, the concrete manner of selecting the above-mentioned taper seal ring includes:
determining the pressure generated by the (j + 1) th water pressure and the jth water pressure according to the diameter of the candidate sealing ring and the (j + 1) th water pressure and the jth water pressure;
and under the condition that the maximum pressure allowed to be borne by the candidate sealing ring is greater than the pressure generated by the j +1 th water pressure and the j water pressure, determining the candidate sealing ring as the j sealing ring.
In particular, the compressive strength P to which the conical seal ring is subjected can be calculated, but not limited to, according to the following equations (3) and (4) Sealing ring ：
Wherein, P Sealing ring The pressure intensity actually born by the conical sealing ring is expressed in megapascals (MPa); p Big (a) For higher water pressure (e.g. P) in adjacent sealed chambers 2 ) In units of megapascals (MPa); p is Small For a lower water pressure (P) in the adjacent sealed cavity 1 ) In units of megapascals (MPa); d is the diameter of the large end (first end) of the sealing ring, and the unit is millimeter (mm); d is the diameter of the small end (second end) of the sealing ring, and the unit is millimeter (mm); d is a radical of 0 The diameter of a middle hole of the conical sealing ring is measured in millimeters (mm); p Material The compression strength of the sealing ring material is expressed in megapascals (MPa); p Insulation The compressive strength of the insulation material of the submarine optical cable is expressed in megapascals (MPa).
In addition, P is Sealing ring Should be less than the compressive strength P of the material of the conical sealing ring Material . If P Sealing ring Greater than P Material Then P should be decreased Small 、P Big (a) The pressure difference therebetween; at the same time, P Sealing ring Should be smaller than submarine cableMaximum compressive strength P allowed to be withstood by insulating material Insulation If P is Sealing ring Greater than P Insulation Then P should be decreased Small 、P Big (a) The pressure difference therebetween.
For example, the water pressure P is applied in the 1 st stage sealing chamber 3 Applying a water pressure P in the 2 nd stage sealing cavity 2 Wherein P is 3 <P 2 In the case of (3), the applied water pressure P is calculated by the above formula 3 And P 2 The pressure generated to the conical sealing ring 1 is P Sealing ring The maximum pressure allowed to be borne by the conical sealing ring 1 is P Material Then only if P Sealing ring <P Material Under the condition of (1), the conical sealing ring 1 can not deform; otherwise, P should be decreased 3 And P 2 Until reduced P 3 And P 2 The generated pressure P Sealing ring <P Material 。
Likewise, the water pressure P is applied in the hypothetical 1 st staged sealing chamber 3 Applying a water pressure P in the 2 nd stage sealing cavity 2 Wherein P is 3 <P 2 In the case of (3), the applied water pressure P is obtained by calculation using the above equation (4) 3 And P 2 The pressure generated to the conical sealing ring 1 is P Sealing ring Then only if P Sealing ring <P Insulation Under the condition of (1), the conical sealing ring 1 can not deform; otherwise, P should be decreased 3 And P 2 Until reduced P 3 And P 2 The generated pressure P Sealing ring <P Insulation 。
It follows that P is satisfied only Sealing ring <P Material And P is Sealing ring <P Insulation Under the condition of (1), the conical sealing ring 1 and the insulating layer of the submarine optical cable can not deform, and good sealing performance is ensured.
By adopting the mode, the pressure intensity generated by two different water pressures is determined according to the diameter of the candidate sealing ring and the two different water pressures applied in the adjacent sealing cavities; and comparing the pressure generated by two different water pressures with the maximum pressure allowed to be borne by the candidate sealing ring, and selecting the sealing ring meeting the requirement, so that the deformation of the sealing ring caused by the large difference of the water pressures applied in the adjacent sealing cavities is avoided, and the reliability of the testing condition of the submarine optical cable is ensured.
As an alternative example, before applying different N water pressures in N sealed chambers in which N lengths of the submarine optical fiber cable are placed, the method further comprises:
and determining to apply different N water pressures in the N sealed cavities according to the target water depth.
As shown in FIG. 8, assume that the water pressure applied in two adjacent sealed chambers is P 1 And P 2 ，P 1 Is equal to P 2 And P Differential water pressure A difference between, wherein P Differential water pressure Depending on the parameters of the graded sealing rings, the material, the compressive strength of the insulation material of the undersea optical cable, e.g. the water pressure P applied in the first adjacent sealing cavity, assuming that the water pressure difference between the adjacent sealing cavities is 10MPa and the maximum water depth P corresponds to 2500 m, depending on the compressive strength of the tapered sealing rings and the material 3 = P-10, water pressure P applied in the second sealed chamber 2 ＝P 3 10, the water pressure P exerted in the third sealed chamber 1 ＝P 2 -10。
It should be noted that the water pressure P applied in the last sealed chamber 1 <10, i.e. the water pressure P applied in the last sealed chamber 1 Should be less than P Differential water pressure 。
By applying gradually increased graded water pressure in the multi-pass graded sealing cavity to perform multi-pass graded water pressure sealing, the reliability of long-term large water pressure is ensured, the test environment of the submarine optical cable is closer to the actual use environment, the reliability of the test result is improved, and the reliability of the submarine optical cable system in long-term application in the deep sea large water depth environment is guaranteed.
In order to simulate the conditions of torsion, tension, bending, etc. caused by the submarine optical cable production, manufacturing, delivering, laying, construction, etc., the submarine optical cable under test in the above embodiments may be, but is not limited to, a target optical cable subjected to mechanical performance processing, wherein the mechanical performance processing includes a tension test 21, a torsion test 22, a coiling test 23, and a tension-bending test 24. The above tests are described below with reference to specific examples:
(one) tensile test
The submarine optical fiber cable was subjected to a tensile test using a test apparatus shown in fig. 5 (a) in the following manner:
fixing two ends of a sample 1 (an optical submarine cable before mechanical property processing is not finished) on a tensile testing machine through a clamping device, applying tensile force F to the sample 1 through a traction device, keeping for a period of time T, and monitoring the additional attenuation and the strain of the optical fiber of the sample 1 in the testing process, wherein the tensile force F (kN) of the sample 1 is calculated through the following formula (5):
F＝μ·(m·h+M) (5)
wherein mu is a tension coefficient and is dimensionless; m is the unit length gravity of the submarine optical cable in seawater, and the unit is kilonewton per meter (kN/m); h is the maximum applicable water depth of the submarine optical cable system, and the unit is meter (m); m is the gravity of the submarine cable joint box 12 in seawater, in kilonewtons (kN); the loading speed of the tensile force F in the test process is less than or equal to 5kN/min:
the retention time T (min) can be calculated according to the following equation (6):
wherein h is the maximum applicable water depth of the submarine optical cable system, and the unit is meter (m); h is the hydrodynamic constant of the submarine cable, and the unit is meter per minute (m/min).
(II) torsion test
The submarine optical cable was subjected to a torsion test using a test apparatus shown in fig. 5 (b) in the following manner:
one end of the sample 1 processed by the tensile test 21 is connected with the clamping device, the other end of the sample is fixed on the tensile testing machine through the torsion device, the traction device applies tensile force F to the sample 1, the torsion device applies torsion to the sample 1, and the additional attenuation and the optical fiber strain of the sample 1 are monitored in the testing process.
Note that, during the torsion test, the following 3 points need to be ensured:
1) The twisting direction is consistent with the stranding direction of the steel wires of the submarine optical cable;
2) The torsion angle is not less than 360 DEG/every 5m and is kept for a period of time T;
3) The loading speed of the tensile force F in the test process is not more than 5kN/min.
(III) coiling test
The test apparatus shown in fig. 6 (a) is used, and the test sample 1 processed by the tensile test 21 and the torsion test 22 is coiled in the cable storage pool through the test platform, so as to simulate the coiling condition in the submarine optical cable production and manufacturing and the cable delivery.
The coiling diameter d is selected according to the bending diameter of the submarine optical cable 11 under no tension and the bending diameter of the submarine optical cable joint box 12 under no tension, and the larger value is selected, but the coiling diameter d cannot exceed 3m; the coiling height H is not too high or too low, and H is more than or equal to 2d and less than or equal to 2.5d; the coiling test takes 1 coiling and 1 developing as a coiling cycle, the number of times of the coiling cycle n is determined according to the number of times of the submarine optical cable 11 required to be coiled in the production, manufacturing and guide cable delivery processes of the submarine optical cable 11, and is generally not less than 6 times.
(IV) tension bending test
The test device shown in fig. 6 (b) is adopted, and a tensile bending test is performed on the pulley through a clamping device by using the sample 1 processed by a tension test 21, a torsion test 22 and a coiling test 23, so that the stress bending condition in the process of laying the submarine optical cable in construction is simulated.
In the process of performing the tension bending test 24, one of the following conditions needs to be satisfied:
1) The diameter D of the pulley is selected according to the bending diameter of the submarine optical cable 11 under tension and the bending diameter of the submarine optical cable joint box 12 under tension, and the larger value is selected, but the larger value cannot exceed 3m;
2) In the tension bending test, the submarine optical cable 11, the submarine optical cable joint box 12 and the submarine optical cable factory joint 13 pass through the pulley once and return to the original point to serve as a tension bending cycle, and the number of tension cycles is not less than 3;
3) The speed of the sample 1 passing through the pulley in the tension bending test process is not more than 1.5m/s, and the loading speed of the tensile force F in the test process is not more than 5kN/min.
In addition, it should be noted that the submarine optical cable line generally includes a submarine optical cable joint box and a submarine optical cable factory joint, and the submarine optical cable joint box and the submarine optical cable factory joint are not included in the submarine optical cable test in the current relevant standards, so that the submarine optical cable line condition under the actual engineering application condition cannot be completely simulated, and the reliability of the submarine optical cable line under the actual use environment cannot be verified.
Therefore, in order to simulate the submarine cable line situation, before the mechanical property processing is performed on the sample 1, the sample 1 is prepared from the submarine cable, wherein the sample 1 comprises a submarine cable 11, a submarine cable joint box 12 and a submarine cable factory joint 13 as shown in fig. 7. Wherein, adopt submarine optical cable 11 to carry out sample preparation, in order to satisfy the mechanical properties processing of sample, usually require submarine optical cable 11's length not less than 25m, concrete manufacture process includes:
1) Cutting off the submarine optical cable 11, and connecting the cut-off submarine optical cable 11 by adopting a submarine optical cable joint box 12 to complete the manufacture of the submarine optical cable joint box 12;
2) Manufacturing a submarine optical cable factory joint 13 at a position which is not less than 3m away from the submarine optical cable joint box 12, and finishing manufacturing the submarine optical cable factory joint 13;
wherein, the sample 1 at least comprises 1 submarine cable joint box 12 and submarine cable factory joint 13, and when a plurality of submarine cable joint boxes 12 and submarine cable factory joints 13 are included, the length L between the adjacent submarine cable joint boxes 12 and submarine cable factory joints 13 is not less than 3m.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present application is not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
According to another aspect of the embodiments of the present application, there is also provided an undersea optical fiber cable testing apparatus, including:
the system comprises a target sealed container, a submarine optical cable and a target connecting piece; the N sections of optical cables in the submarine optical cable are placed in N sealed cavities in a target sealed container, and the head end and the tail end of the submarine optical cable are connected through a target connecting piece; the integral sealed cavity in the target sealed container is divided into N sealed cavities, the submarine optical cable comprises N sections of optical cables, and each section of optical cable in the N sections of optical cables is positioned in a corresponding sealed cavity in the N sealed cavities; the submarine optical cable penetrates through the target sealed container, the head end and the tail end of the submarine optical cable are arranged outside the target sealed container, and N is a positive integer greater than or equal to 2;
the control device is used for applying different N water pressures in N sealed cavities in which N sections of optical cables in the submarine optical cable are placed, wherein the corresponding one of the N water pressures is applied in each sealed cavity of the N sealed cavities, and the water pressures applied in the sealed cavities are different; applying a target voltage to the submarine optical cable through the target connecting piece, wherein the target voltage is a voltage required for maintaining the submarine optical cable to work at the target water depth within a preset time period; determining that the undersea optical fiber cable is allowed to operate at the target water depth in case the undersea optical fiber cable is not broken down for a preset time period.
Optionally, the control device is further configured to sequentially increase the water pressure applied to each of the N sealed chambers in a direction from the head end to the tail end, or sequentially increase the water pressure applied to each of the N sealed chambers in a direction from the tail end to the head end.
Optionally, the control device is further configured to, in a case where a jth seal ring is disposed between a jth seal cavity and a jth +1 seal cavity of the N seal cavities, apply a jth water pressure of the N water pressures in the jth seal cavity, and apply a jth +1 water pressure of the N water pressures in the jth +1 seal cavity, where j is a positive integer greater than or equal to 1 and less than N, and a maximum pressure allowed to be borne by the jth seal ring is greater than pressures generated by the jth +1 water pressure and the jth water pressure.
Optionally, the control device is further configured to perform the following operations before applying different N water pressures in the N sealed chambers in which the N lengths of optical cables in the submarine optical cable are placed:
determining the pressure generated by the (j + 1) th water pressure and the jth water pressure according to the diameter of the candidate sealing ring and the (j + 1) th water pressure and the jth water pressure;
and under the condition that the maximum pressure allowed to be borne by the candidate sealing ring is greater than the pressure generated by the j +1 th water pressure and the j water pressure, determining the candidate sealing ring as the j sealing ring.
Optionally, the control device is further configured to obtain attenuation indexes of the optical fibers in the N segments of optical cables within a preset time period after applying a target voltage to the submarine optical cable through the target connection member;
determining that the undersea optical fiber cable is allowed to operate at the target water depth in a case where the attenuation index is less than or equal to a preset threshold value.
Optionally, the control device is further configured to determine to apply different N water pressures in the N sealed cavities according to the target water depth.
The device is applied to apply different N water pressures in N sealing cavities where N sections of optical cables in the submarine optical cables are placed, and apply target voltage to the submarine optical cables, so that the submarine optical cable application environment under the test condition is closer to the actual engineering application environment, whether the submarine optical cables are allowed to work at the target water depth or not is determined according to whether the submarine optical cables in the application environment under the test condition are broken down within the preset time period, the technical problem that the reliability of the submarine optical cables in the actual application environment cannot be verified in the related technology is solved, and the technical effect of improving the reliability of the test result is achieved.
For specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments and exemplary implementations, and details of this embodiment are not repeated herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of testing an undersea optical fiber cable, comprising:
applying different N water pressures in N sealed cavities in which N sections of optical cables in the submarine optical cable are placed, wherein the N sealed cavities are obtained by dividing an integral sealed cavity in a target sealed container, each optical cable in the N sections of optical cables is located in a corresponding sealed cavity in the N sealed cavities, a corresponding water pressure in the N water pressures is applied in each sealed cavity in the N sealed cavities, the water pressures applied in the sealed cavities are different, the submarine optical cable penetrates through the target sealed container, a head end and a tail end of the submarine optical cable are placed outside the target sealed container, the head end and the tail end are connected through a target connecting piece, and N is a positive integer greater than or equal to 2;
applying a target voltage to the undersea optical cable through the target connection, wherein the target voltage is a voltage required to maintain the undersea optical cable at a target water depth for a preset time period;
determining that the undersea optical fiber cable is allowed to operate at the target water depth if the undersea optical fiber cable is not broken down within the preset time period.
2. The method of claim 1, wherein the water pressure applied within each of the N capsule cavities increases in a direction from the head end to the tail end or in a direction from the tail end to the head end.
3. The method of claim 1, wherein applying different N water pressures within the N sealed chambers in which the N lengths of undersea optical fiber cable are disposed comprises:
under the condition that a j-th sealing ring is arranged between a j-th sealing cavity and a j + 1-th sealing cavity in the N sealing cavities, j is a positive integer which is greater than or equal to 1 and less than N, and j + 1-th water pressure in the N water pressures is exerted in the j + 1-th sealing cavity, wherein the maximum pressure allowed to be borne by the j-th sealing ring is greater than the pressure generated by the j + 1-th water pressure and the j + 1-th water pressure.
4. The method of claim 3, wherein before applying the different N water pressures within the N sealed chambers in which the N lengths of undersea optical fiber cable are placed, the method further comprises:
determining the pressure generated by the j +1 th water pressure and the j water pressure according to the diameter of the candidate sealing ring, the j +1 th water pressure and the j water pressure;
and determining the candidate sealing ring as the jth sealing ring under the condition that the maximum pressure allowed to be borne by the candidate sealing ring is greater than the pressure generated by the jth +1 water pressure and the jth water pressure.
5. The method of any one of claims 1 to 4, wherein after applying a target voltage to the undersea optical fiber cable through the target connection, the method further comprises:
obtaining attenuation indexes of optical fibers in the N sections of optical cables in the preset time period;
determining that the undersea optical fiber cable is allowed to operate at the target water depth if the attenuation indicator is less than or equal to a preset threshold.
6. The method of any one of claims 1 to 4, wherein before applying the different N water pressures within the N sealed chambers in which the N lengths of undersea optical fiber cable are placed, the method further comprises:
and determining to apply different N water pressures in the N sealed cavities according to the target water depth.
7. An undersea optical fiber cable testing apparatus, comprising:
the system comprises a target sealed container, a submarine optical cable and a target connecting piece; wherein N lengths of the undersea optical fiber cables are placed in N sealed chambers in the target sealed container, and the head end and the tail end of the undersea optical fiber cables are connected through the target connector; the integral sealed cavity in the target sealed container is divided into the N sealed cavities, the submarine optical cable comprises the N sections of optical cables, and each section of optical cable in the N sections of optical cables is positioned in a corresponding sealed cavity in the N sealed cavities; the submarine optical cable penetrates through the target sealed container, the head end and the tail end of the submarine optical cable are arranged outside the target sealed container, and N is a positive integer greater than or equal to 2;
a control device for applying different N water pressures in the N sealed cavities in which the N sections of the submarine optical cables are placed, wherein a corresponding one of the N water pressures is applied in each of the N sealed cavities, and the water pressures applied in the sealed cavities are different; applying a target voltage to the undersea optical cable through the target connection, wherein the target voltage is a voltage required to maintain the undersea optical cable at a target water depth for a preset time period; determining that the undersea optical fiber cable is allowed to operate at the target water depth if the undersea optical fiber cable is not broken down within the preset time period.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein the program is executable by a terminal device or a computer to perform the method of any one of claims 1 to 6.
9. A computer program product comprising computer program/instructions, characterized in that the computer program/instructions, when executed by a processor, implement the steps of the method as claimed in any one of claims 1 to 6.
10. An electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to execute the method of any of claims 1 to 6 by means of the computer program.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117110078A (en) * | 2023-10-23 | 2023-11-24 | 山东万达海缆有限公司 | Submarine cable bending fatigue testing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117110078A (en) * | 2023-10-23 | 2023-11-24 | 山东万达海缆有限公司 | Submarine cable bending fatigue testing device |
| CN117110078B (en) * | 2023-10-23 | 2023-12-22 | 山东万达海缆有限公司 | Submarine cable bending fatigue testing device |
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