CN112556752A - In-service carbon fiber composite core wire mechanical property testing method, device and system - Google Patents
In-service carbon fiber composite core wire mechanical property testing method, device and system Download PDFInfo
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Abstract
The invention provides a method, a device and a system for testing mechanical properties of an in-service carbon fiber composite core wire. The invention realizes the mechanical property test of the in-service carbon fiber composite core wire and provides a basis for the high-temperature sag characteristic evaluation of the in-service carbon fiber composite core wire line.
Description
Technical Field
The invention relates to the technical field of overhead transmission conductors, in particular to a method, a device and a system for testing mechanical properties of an in-service carbon fiber composite core conductor.
Background
The carbon fiber composite core wire is a novel overhead transmission line wire, and compared with the existing steel-cored aluminum strand, the carbon fiber composite core wire has the advantages of light weight, small high-temperature sag, large pulling force, large current-carrying capacity and the like. The carbon fiber composite core wire is more and more applied to the power transmission line, and as long as 12 months in 2017, more than 400 overhead power transmission lines of national power grid companies use the carbon fiber composite core wire, the line length reaches more than 2900 kilometers, and the wire length is more than 12800 kilometers in total. Meanwhile, the service life is longer and longer, the first carbon fiber composite core wire in China is erected in 2006, which is 15 years old today. The carbon fiber composite core wire core rod is inevitably aged in the operation process, and the operation uncertainty risk caused by aging is gradually increased along with the increase of the service life. The method has important technical significance for the operation of the lead, particularly the high-temperature operation by mastering the actual mechanical characteristics of the carbon fiber composite core lead. Therefore, there is a need for a method for testing mechanical properties of a carbon fiber composite core wire in service, which provides a basis for the design and operation of the circuit.
Disclosure of Invention
In view of the above, the invention provides a method, a device and a system for testing mechanical properties of an in-service carbon fiber composite core wire, which are used for testing the mechanical properties of the in-service carbon fiber composite core wire and providing a basis for the design and operation of a circuit.
In order to achieve the above object, the following solutions are proposed:
in a first aspect, a method for testing mechanical properties of an in-service carbon fiber composite core wire is provided, which comprises the following steps:
acquiring span length, section area and initial-state conductor sag of the carbon fiber composite core conductor;
calculating the length of the carbon fiber composite core wire in the initial state by using a wire length formula, wherein the wire length formula is as follows:
wherein, L represents the length of the wire, D represents the sag of the wire, and S represents the span length;
heating the carbon fiber composite core wire to obtain the wire tension of the carbon fiber composite core wire at a plurality of temperature points, and calculating the stress of the carbon fiber composite core wire at the plurality of temperature points by using a stress formula, wherein the stress formula is as follows:
wherein, tiRepresents the temperature, sigma, of the carbon fiber composite core wire measured at the ith timeiDenotes the carbon fiber composite core wire at tiStress of time HiDenotes the carbon fiber composite core wire at tiThe wire tension, a, represents the wire cross-sectional area;
when the carbon fiber composite core wire is heated, the wire sag of the carbon fiber composite core wire at a plurality of temperature points is obtained, and the strain of the carbon fiber composite core wire at the plurality of temperature points is obtained by utilizing the wire length formula and the strain formula, wherein the strain formula is as follows:
wherein epsiloniDenotes the carbon fiber composite core wire at tiStrain of time, LiDenotes the carbon fiber composite core wire at tiLength of conductor of hour, L0A wire length representing the carbon fiber composite core wire in an initial state;
and drawing and carrying out normalization treatment according to the stress and strain of the plurality of temperature points to obtain a stress-strain curve graph of the carbon fiber composite core wire.
Preferably, after obtaining the wire sag of the carbon fiber composite core wire at a plurality of temperature points, the method further comprises:
and drawing according to the conductor sag of the plurality of temperature points to obtain a temperature-conductor sag curve graph of the carbon fiber composite core conductor.
Preferably, obtaining the conductor sag of the carbon fiber composite core conductor in the initial state specifically includes:
acquiring performance parameters of the carbon fiber composite core wire, and calculating to obtain the specific load of the wire according to the performance parameters;
the method comprises the steps of obtaining the wire tension of the carbon fiber composite core wire in an initial state, and calculating to obtain the wire sag of the carbon fiber composite core wire in the initial state by utilizing a sag formula, wherein the sag formula is as follows:
wherein W represents the wire specific load, S represents the span length, and H represents the wire tension.
Preferably, obtaining the conductor sag of the carbon fiber composite core conductor at a plurality of temperature points specifically comprises:
and acquiring conductor sag of the carbon fiber composite core conductor at a plurality of temperature points through a sag sensor.
In a second aspect, an in-service carbon fiber composite core wire mechanical property testing device is provided, which comprises:
the acquiring unit is used for acquiring the span length, the cross-sectional area and the initial-state conductor sag of the carbon fiber composite core conductor;
the lead length calculation unit is used for calculating the lead length of the carbon fiber composite core lead in the initial state by using a lead length formula, wherein the lead length formula is as follows:
wherein, L represents the length of the wire, D represents the sag of the wire, and S represents the span length;
the stress calculation unit is used for heating the carbon fiber composite core wire to obtain the wire tension of the carbon fiber composite core wire at a plurality of temperature points, and calculating the stress of the carbon fiber composite core wire at the plurality of temperature points by using a stress formula, wherein the stress formula is as follows:
wherein, tiRepresents the temperature, sigma, of the carbon fiber composite core wire measured at the ith timeiDenotes the carbon fiber composite core wire at tiStress of time HiDenotes the carbon fiber composite core wire at tiThe wire tension, a, represents the wire cross-sectional area;
the strain calculation unit is used for obtaining the conductor sag of the carbon fiber composite core conductor at a plurality of temperature points when the temperature of the carbon fiber composite core conductor is raised, and calculating the strain of the carbon fiber composite core conductor at the plurality of temperature points by using the conductor length formula and the strain formula, wherein the strain formula is as follows:
wherein epsiloniDenotes the carbon fiber composite core wire at tiStrain of time, LiDenotes the carbon fiber composite core wire at tiLength of conductor of hour, L0A wire length representing the carbon fiber composite core wire in an initial state;
and the stress-strain curve unit is used for drawing and carrying out normalization treatment according to the stress and strain of the plurality of temperature points to obtain a stress-strain curve graph of the carbon fiber composite core wire.
Preferably, the mechanical property testing device for the in-service carbon fiber composite core wire further comprises:
and the temperature-lead sag curve unit is used for drawing according to the lead sag of the plurality of temperature points to obtain a temperature-lead sag curve graph of the carbon fiber composite core lead.
Preferably, the process of acquiring the conductor sag of the carbon fiber composite core conductor in the initial state by the acquiring unit specifically includes:
acquiring performance parameters of the carbon fiber composite core wire, and calculating to obtain the specific load of the wire according to the performance parameters;
the method comprises the steps of obtaining the wire tension of the carbon fiber composite core wire in an initial state, and calculating to obtain the wire sag of the carbon fiber composite core wire in the initial state by utilizing a sag formula, wherein the sag formula is as follows:
wherein W represents the wire specific load, S represents the span length, and H represents the wire tension.
Preferably, the strain calculation unit obtains the conductor sag of the carbon fiber composite core conductor at a plurality of temperature points through a sag sensor.
In a third aspect, a system for testing mechanical properties of an in-service carbon fiber composite core wire is provided, which includes:
the tension sensor is used for acquiring the wire tension of the carbon fiber composite core wire;
the temperature sensor is used for acquiring the temperature of the carbon fiber composite core wire;
the sag sensor is used for acquiring a carbon fiber composite core lead;
the current generator is used for providing current for the carbon fiber composite core lead;
an upper computer respectively connected with the tension sensor, the temperature sensor, the sag sensor and the current generator, wherein the upper computer comprises a device for testing the mechanical property of any carbon fiber composite core wire in the second aspect
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the technical scheme, the method, the device and the system for testing the mechanical property of the in-service carbon fiber composite core wire are characterized in that the method comprises the steps of heating the carbon fiber composite core wire to obtain the stress and strain of the carbon fiber composite core wire at a plurality of temperature points, drawing the stress and strain of the wire and carrying out normalization treatment to obtain a stress-strain curve graph of the carbon fiber composite core wire. The invention realizes the mechanical property test of the in-service carbon fiber composite core wire mechanics and provides a basis for the high-temperature sag characteristic evaluation of the in-service carbon fiber composite core wire line.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a method for testing mechanical properties of an in-service carbon fiber composite core wire according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a device for testing mechanical properties of an in-service carbon fiber composite core wire according to an embodiment of the present invention;
FIG. 3 is a stress-strain curve of an in-service carbon fiber composite core wire according to an embodiment of the present invention;
fig. 4 is a temperature-conductor sag curve diagram of an in-service carbon fiber composite core conductor according to an embodiment of the present invention.
Detailed Description
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.
The mechanical properties of the carbon fiber composite core wire are different from those of a common steel-cored aluminum strand, which are determined by the material properties of the carbon fiber composite core wire. The linear expansion coefficient of the carbon fiber composite core is 2.0 multiplied by 10 < -6 >/DEG C, the linear expansion coefficient of the steel core is 11.5 multiplied by 10 < -6 >/DEG C, and the linear expansion coefficient of the aluminum wire is 23 multiplied by 10 < -6 >/DEG C. The linear expansion coefficient of the carbon fiber composite core is far lower than that of the steel core and the aluminum wire, so that when the wire runs at high temperature and the running temperature is higher than a certain temperature point, the tension of the wire is completely borne by the reinforced core, the stress of the aluminum conductor part is theoretically zero, the special temperature transition point is called as 'inflection point temperature', and the sag of the wire is not obvious along with the temperature due to the characteristic of low linear expansion coefficient of the carbon fiber composite core, and is also called as 'sag inflection point temperature'. The invention provides a mechanical property test method for a carbon fiber composite core wire, which is used for testing a stress-strain curve chart of the carbon fiber composite core wire in an operating temperature range and further testing a temperature-sag curve chart of the carbon fiber composite core wire in the operating temperature range, so that the mechanical property test of the carbon fiber composite core wire in an actual circuit is realized, and a basis is provided for circuit evaluation.
Referring to fig. 1, the method for testing mechanical properties of an in-service carbon fiber composite core wire provided in this embodiment is an in-service carbon fiber composite wire. The method comprises the following steps:
s11: and acquiring the span length, the section area and the initial-state conductor sag of the carbon fiber composite core conductor.
The state of the carbon fiber composite core wire before the carbon fiber composite core wire is not heated is an initial state. In some specific embodiments, the conductor sag of the carbon fiber composite core conductor in the initial state is calculated through a sag formula; specifically, firstly, acquiring performance parameters of the carbon fiber composite core wire, and calculating to obtain the specific load of the wire according to the performance parameters, wherein the performance parameters include but are not limited to the diameter of the wire, the unit weight of the wire, the sectional area of the wire and the like; and then obtaining the wire tension of the carbon fiber composite core wire in the initial state, and calculating to obtain the wire sag of the carbon fiber composite core wire in the initial state by utilizing a sag formula. The sag formula is:
wherein W represents the wire specific load, S represents the span length, and H represents the wire tension. And substituting the obtained conductor tension of the carbon fiber composite core conductor in the initial state into a sag formula to obtain the conductor sag in the initial state. The tension of the lead is measured by tension sensors arranged at two ends of the carbon fiber composite core lead to be measured.
The conductor sag can be acquired through a sag sensor. The sag sensor mainly comprises a distance measuring sensor, an inclination angle sensor and the like, and the wire sag is obtained through calculation.
S12: and calculating the length of the carbon fiber composite core wire in the initial state by using a wire length formula.
The wire length formula is:
wherein L represents the wire length, D represents the wire sag, and S represents the span length. And substituting the span length obtained in the step S11 and the conductor sag in the initial state into a conductor length formula to obtain the conductor length of the carbon fiber composite core conductor in the initial state.
S13: and heating the carbon fiber composite core wire to obtain the wire tension of the carbon fiber composite core wire at a plurality of temperature points, and calculating the stress of the carbon fiber composite core wire at the plurality of temperature points by utilizing a stress formula.
In some embodiments, any two phases of wires in the in-service carbon fiber composite core wire are connected into a loop, wherein one phase of wire is used as a test wire, the other phase of wire is used as a loop line, and a current is supplied to the test wire through a current generator, so that the temperature of the test wire is raised. Heating the carbon fiber composite core wire to the highest temperature as possible so that the heating process covers the inflection point temperature; the carbon fiber composite core wire can be heated to the maximum temperature allowed by the carbon fiber composite core wire. And measuring the temperature of the carbon fiber composite core wire by using a temperature sensor.
When the wire tension of the carbon fiber composite core wire at a plurality of temperature points is obtained, the more the selected temperature points are, the more accurate the finally obtained tension-strain curve is, but the larger the calculated amount is, a person skilled in the art can select the appropriate number of temperature points according to actual needs, and the invention is not limited to this, and the invention belongs to the protection scope of the invention.
The stress formula is:
wherein, tiRepresents the temperature, sigma, of the carbon fiber composite core wire measured at the ith timeiDenotes the carbon fiber composite core wire at tiStress of time HiDenotes the carbon fiber composite core wire at tiThe wire tension at the time, a, represents the wire cross-sectional area. In the present embodiment, it is considered that both the wire cross-sectional area and the span length are constant during the temperature rise, and therefore, the stresses at a plurality of temperature points can be calculated using the wire cross-sectional area and the wire tensions at a plurality of temperature points acquired in step S11.
S14: when the temperature of the carbon fiber composite core wire is raised, the wire sag of the carbon fiber composite core wire at a plurality of temperature points is obtained, and the strain of the carbon fiber composite core wire at the plurality of temperature points is calculated by utilizing a wire length formula and a strain formula.
In some embodiments, the wire sag of the carbon fiber composite core wire at multiple temperature points is acquired by a sag sensor. Of course, the conductor sag of the carbon fiber composite core conductor at a plurality of temperature points can also be obtained by calculation through a sag formula.
In the process of heating the carbon fiber composite core wire, the span length and the wire specific load are considered to be unchanged; therefore, when the carbon fiber composite core wire is calculated and obtained through the sag formula and the wire sag of a plurality of temperature points, only one time of wire specific load calculation is needed, the tension of the carbon fiber composite core wire at the temperature points is measured through the tension sensor, the wire sag formula is substituted into the wire sag formula respectively, and the wire sag of the temperature points is calculated and obtained.
And respectively substituting the conductor sag of the plurality of temperature points into a conductor length formula to calculate the conductor length of the plurality of temperature points.
The strain formula is:
wherein epsiloniDenotes the carbon fiber composite core wire at tiStrain of time, LiDenotes the carbon fiber composite core wire at tiLength of conductor of hour, L0The wire length of the carbon fiber composite core wire in the initial state is shown.
S15: and drawing and normalizing according to the stress and strain of the plurality of temperature points to obtain a stress-strain curve graph of the carbon fiber composite core wire.
Furthermore, after the conductor sag of the carbon fiber composite core conductor at a plurality of temperature points is obtained, drawing can be performed according to the conductor sag of the plurality of temperature points, and a temperature-conductor sag curve graph of the carbon fiber composite core conductor is obtained.
The units of the respective parameters in this embodiment are as follows:
and (3) wire sag: m;
wire specific load: n/(m.mm)2)；
Span length: m;
tension of the lead: kN;
length of the lead: m;
stress of the wire: MPa;
sectional area of the wire: mm is2。
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention.
The following are embodiments of the apparatus of the present invention that may be used to perform embodiments of the method of the present invention. For details which are not disclosed in the embodiments of the apparatus of the present invention, reference is made to the embodiments of the method of the present invention.
Referring to fig. 2, the device for testing mechanical properties of an in-service carbon fiber composite core wire provided in this embodiment includes: an acquisition unit 21, a wire length calculation unit 22, a stress calculation unit 23, a strain calculation unit 24, and a stress-strain curve unit 25.
The acquiring unit 21 is used for acquiring the span length, the cross-sectional area and the initial-state wire sag of the carbon fiber composite core wire.
And the wire length calculating unit 22 is used for calculating the wire length of the carbon fiber composite core wire in the initial state by using a wire length formula.
The wire length formula is:
wherein, L represents the length of the wire, D represents the sag of the wire, and S represents the span length;
the stress calculation unit 23 is configured to heat the carbon fiber composite core wire, obtain wire tensions of the carbon fiber composite core wire at multiple temperature points, and calculate the stress of the carbon fiber composite core wire at the multiple temperature points by using a stress formula.
The stress formula is:
wherein, tiRepresents the temperature, sigma, of the carbon fiber composite core wire measured at the ith timeiDenotes the carbon fiber composite core wire at tiStress of time HiDenotes the carbon fiber composite core wire at tiThe wire tension at the time, a, represents the wire cross-sectional area.
And the strain calculation unit 24 is configured to further obtain the conductor sag of the carbon fiber composite core conductor at a plurality of temperature points when the temperature of the carbon fiber composite core conductor is raised, and calculate the strain of the carbon fiber composite core conductor at the plurality of temperature points by using a conductor length formula and a strain formula.
The strain formula is:
wherein epsiloniDenotes the carbon fiber composite core wire at tiStrain of time, LiDenotes the carbon fiber composite core wire at tiLength of conductor of hour, L0The wire length of the carbon fiber composite core wire in the initial state is shown.
And the stress-strain curve unit 25 is used for drawing and normalizing according to the stress and strain of a plurality of temperature points to obtain a stress-strain curve graph of the carbon fiber composite core wire.
In some embodiments, the device for testing mechanical properties of a carbon fiber composite core wire further includes: and the temperature-lead sag curve unit is used for drawing according to the lead sag of a plurality of temperature points to obtain a temperature-lead sag curve graph of the carbon fiber composite core lead.
In some specific embodiments, the process of acquiring the conductor sag of the carbon fiber composite core conductor in the initial state by the acquiring unit 21 specifically includes: acquiring performance parameters of the carbon fiber composite core wire, and calculating to obtain the specific load of the wire according to the performance parameters; and obtaining the wire tension of the carbon fiber composite core wire in the initial state, and calculating to obtain the wire sag of the carbon fiber composite core wire in the initial state by utilizing a sag formula.
The sag formula is:
wherein W represents the wire specific load, S represents the span length, and H represents the wire tension.
In some embodiments, the strain calculation unit 24 obtains the wire sag of the carbon fiber composite core wire at a plurality of temperature points, in particular through a sag sensor.
This embodiment still provides an in-service carbon fiber composite core wire mechanical properties test system, includes:
the tension sensor is used for acquiring the wire tension of the carbon fiber composite core wire;
the temperature sensor is used for acquiring the temperature of the carbon fiber composite core wire;
the sag sensor is used for acquiring a carbon fiber composite core lead;
the current generator is used for providing current for the carbon fiber composite core lead; and the number of the first and second groups,
the upper computer is respectively connected with the tension sensor, the temperature sensor, the sag sensor and the current generator, and the carbon fiber composite core wire mechanical property testing device is arranged on the upper computer.
The following illustrates the installation and use process of the in-service carbon fiber composite core wire mechanical property testing system provided by the invention.
1. A certain actual carbon fiber composite core wire operation line is selected as a test section, and the line comprises 2 strain towers and 2 linear towers with 2 spans, wherein the spans are respectively 300m and 400 m.
2. The performance parameters of the line composite core wire are shown in table 1.
3. At the two tension towers, the jumper wires for connecting the leads at the two ends are respectively disconnected, any two phases of the three-phase leads are selected, such as AB or AC or BC, and the three-phase leads are connected by adopting a connecting wire. One phase of the conducting wire is used as a testing conducting wire, and the other phase of the conducting wire is used as a return line.
4. Tension sensors are respectively installed at the tension-resistant parts at the two ends of the test lead, and a sag sensor and a temperature sensor are installed on the test lead in the middle of the 2 spans.
5. And a current generator is arranged below the strain tower at one end, and the large current generator is connected with a test lead by adopting a lead.
6. And (5) taking the natural environment temperature of the test wire as the test starting temperature, and recording related data.
7. The heating speed is 5-10 ℃/10min, and the highest lead temperature is 150 ℃.
8. The curves of fig. 3 and 4 were plotted against data during the experiment.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are mainly described as different from other embodiments, the same and similar parts in the embodiments may be referred to each other, and the features described in the embodiments in the present description may be replaced with each other or combined with each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A method for testing mechanical properties of an in-service carbon fiber composite core wire is characterized by comprising the following steps:
acquiring span length, section area and initial-state conductor sag of the carbon fiber composite core conductor;
calculating the length of the carbon fiber composite core wire in the initial state by using a wire length formula, wherein the wire length formula is as follows:
wherein, L represents the length of the wire, D represents the sag of the wire, and S represents the span length;
heating the carbon fiber composite core wire to obtain the wire tension of the carbon fiber composite core wire at a plurality of temperature points, and calculating the stress of the carbon fiber composite core wire at the plurality of temperature points by using a stress formula, wherein the stress formula is as follows:
wherein, tiRepresents the temperature, sigma, of the carbon fiber composite core wire measured at the ith timeiDenotes the carbon fiber composite core wire at tiStress of time HiDenotes the carbon fiber composite core wire at tiThe wire tension, a, represents the wire cross-sectional area;
when the carbon fiber composite core wire is heated, the wire sag of the carbon fiber composite core wire at a plurality of temperature points is obtained, and the strain of the carbon fiber composite core wire at the plurality of temperature points is obtained by utilizing the wire length formula and the strain formula, wherein the strain formula is as follows:
wherein epsiloniDenotes the carbon fiber composite core wire at tiStrain of time, LiDenotes the carbon fiber composite core wire at tiLength of conductor of hour, L0A wire length representing the carbon fiber composite core wire in an initial state;
and drawing and carrying out normalization treatment according to the stress and strain of the plurality of temperature points to obtain a stress-strain curve graph of the carbon fiber composite core wire.
2. The in-service carbon fiber composite core wire mechanical property testing method of claim 1, wherein after obtaining the wire sag of the carbon fiber composite core wire at a plurality of temperature points, the method further comprises:
and drawing according to the conductor sag of the plurality of temperature points to obtain a temperature-conductor sag curve graph of the carbon fiber composite core conductor.
3. The in-service carbon fiber composite core wire mechanical property testing method of claim 1, wherein obtaining the sag of the carbon fiber composite core wire in the initial state specifically comprises:
acquiring performance parameters of the carbon fiber composite core wire, and calculating to obtain the specific load of the wire according to the performance parameters;
the method comprises the steps of obtaining the wire tension of the carbon fiber composite core wire in an initial state, and calculating to obtain the wire sag of the carbon fiber composite core wire in the initial state by utilizing a sag formula, wherein the sag formula is as follows:
wherein W represents the wire specific load, S represents the span length, and H represents the wire tension.
4. The in-service carbon fiber composite core wire mechanical property testing method of claim 1, wherein obtaining the wire sag of the carbon fiber composite core wire at a plurality of temperature points specifically comprises:
and acquiring conductor sag of the carbon fiber composite core conductor at a plurality of temperature points through a sag sensor.
5. The utility model provides an in-service carbon fiber composite core wire mechanical properties testing arrangement which characterized in that includes:
the acquiring unit is used for acquiring the span length, the cross-sectional area and the initial-state conductor sag of the carbon fiber composite core conductor;
the lead length calculation unit is used for calculating the lead length of the carbon fiber composite core lead in the initial state by using a lead length formula, wherein the lead length formula is as follows:
wherein, L represents the length of the wire, D represents the sag of the wire, and S represents the span length;
the stress calculation unit is used for heating the carbon fiber composite core wire to obtain the wire tension of the carbon fiber composite core wire at a plurality of temperature points, and calculating the stress of the carbon fiber composite core wire at the plurality of temperature points by using a stress formula, wherein the stress formula is as follows:
wherein, tiRepresents the temperature, sigma, of the carbon fiber composite core wire measured at the ith timeiDenotes the carbon fiber composite core wire at tiStress of time HiDenotes the carbon fiber composite core wire at tiThe wire tension, a, represents the wire cross-sectional area;
the strain calculation unit is used for obtaining the conductor sag of the carbon fiber composite core conductor at a plurality of temperature points when the temperature of the carbon fiber composite core conductor is raised, and calculating the strain of the carbon fiber composite core conductor at the plurality of temperature points by using the conductor length formula and the strain formula, wherein the strain formula is as follows:
wherein epsiloniDenotes the carbon fiber composite core wire at tiStrain of time, LiDenotes the carbon fiber composite core wire at tiLength of conductor of hour, L0A wire length representing the carbon fiber composite core wire in an initial state;
and the stress-strain curve unit is used for drawing and carrying out normalization treatment according to the stress and strain of the plurality of temperature points to obtain a stress-strain curve graph of the carbon fiber composite core wire.
6. The in-service carbon fiber composite core wire mechanical property testing device of claim 5, further comprising:
and the temperature-lead sag curve unit is used for drawing according to the lead sag of the plurality of temperature points to obtain a temperature-lead sag curve graph of the carbon fiber composite core lead.
7. The in-service carbon fiber composite core wire mechanical property testing device of claim 5, wherein the process of acquiring the sag of the carbon fiber composite core wire in the initial state by the acquiring unit specifically comprises:
acquiring performance parameters of the carbon fiber composite core wire, and calculating to obtain the specific load of the wire according to the performance parameters;
the method comprises the steps of obtaining the wire tension of the carbon fiber composite core wire in an initial state, and calculating to obtain the wire sag of the carbon fiber composite core wire in the initial state by utilizing a sag formula, wherein the sag formula is as follows:
wherein W represents the wire specific load, S represents the span length, and H represents the wire tension.
8. The in-service carbon fiber composite core wire mechanical property testing device of claim 5, wherein the strain calculating unit obtains wire sag of the carbon fiber composite core wire at a plurality of temperature points through a sag sensor.
9. The utility model provides an in-service carbon fiber composite core wire mechanical properties test system which characterized in that includes:
the tension sensor is used for acquiring the wire tension of the carbon fiber composite core wire;
the temperature sensor is used for acquiring the temperature of the carbon fiber composite core wire;
the sag sensor is used for acquiring a carbon fiber composite core lead;
the current generator is used for providing current for the carbon fiber composite core lead;
the upper computer is respectively connected with the tension sensor, the temperature sensor, the sag sensor and the current generator and comprises the carbon fiber composite core wire mechanical property testing device as claimed in any one of claims 5 to 8.
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| CN202011389912.4A CN112556752B (en) | 2020-12-01 | 2020-12-01 | In-service carbon fiber composite core wire mechanical property testing method, device and system |
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| CN113418629A (en) * | 2021-06-25 | 2021-09-21 | 国网辽宁省电力有限公司沈阳供电公司 | Inflection point temperature measurement method of carbon fiber composite core wire |
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|---|---|---|---|---|
| CN113418629A (en) * | 2021-06-25 | 2021-09-21 | 国网辽宁省电力有限公司沈阳供电公司 | Inflection point temperature measurement method of carbon fiber composite core wire |
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