CN114112152B - Overhead line stress variable temperature compensation method, device and storage medium - Google Patents
Overhead line stress variable temperature compensation method, device and storage medium Download PDFInfo
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- CN114112152B CN114112152B CN202010876846.7A CN202010876846A CN114112152B CN 114112152 B CN114112152 B CN 114112152B CN 202010876846 A CN202010876846 A CN 202010876846A CN 114112152 B CN114112152 B CN 114112152B
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- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
Abstract
The invention provides an overhead line stress temperature change compensation method, device and storage medium, wherein the method comprises the steps of obtaining target parameters of an overhead line to be detected; determining the equivalent elastic modulus of the overhead line according to the preset stress, the preset initial elongation and the elastic modulus; determining a compensation temperature of the overhead line in a second state according to the equivalent elastic modulus and a reference stress, wherein the reference stress is determined by an initial stress, an initial specific load, an initial air temperature, an annual average specific load and an annual average air temperature; and determining the target stress of the overhead line in the third state according to the target specific load, the target air temperature and the compensation temperature. In this way, the non-constant compensation temperature of the overhead line under the actual stress is determined, and the actual stress of the overhead line is calculated according to the compensation temperature, so that the accuracy of stress calculation is improved.
Description
Technical Field
The invention relates to the field of power systems, in particular to an overhead line stress variable temperature compensation method, an overhead line stress variable temperature compensation device and a storage medium.
Background
In an electric power system, an overhead line undergoes inelastic plastic elongation and creep elongation under the action of long-term stress, and the plastic elongation and creep elongation are referred to as initial elongation. The overhead line is influenced by initial elongation and is permanently deformed, so that the overhead line is loosened, sag is increased, the ground distance of the overhead line and the distance to a crossing object are reduced, and a certain potential safety hazard may exist. Therefore, the stress of the overhead line under the influence of initial elongation needs to be accurately calculated, and then the sag of the overhead line is adjusted according to the stress of the overhead line, so that the safe and stable operation of the overhead transmission line is ensured.
In view of the above, it is considered in the prior art that the amount of elongation for initial elongation of an overhead wire of a certain type is substantially fixed, and further, the overhead wire is cooled using a constant compensation temperature, and the stress of the overhead wire is estimated using the compensation temperature. However, in practical situations, the elongation of the initial elongation of the overhead line is closely related to the actual stress situation, and is not a constant value, so that the stress calculation is inaccurate.
Disclosure of Invention
The embodiment of the invention provides an overhead line stress temperature change compensation method, an overhead line stress temperature change compensation device and a storage medium, and aims to solve the technical problem that overhead line stress cannot be accurately calculated.
In a first aspect, an embodiment of the present invention provides a method for compensating for temperature change of overhead line stress, including:
acquiring target parameters of an overhead line to be detected, wherein the target parameters comprise preset stress, preset initial elongation corresponding to the preset stress, elastic modulus, initial stress in a first state, initial specific load in the first state, initial air temperature in the first state, annual average specific load in a second state, annual average air temperature in the second state, target specific load in a third state and target air temperature in the third state;
determining an equivalent elastic modulus of the overhead line according to the preset stress, the preset initial elongation and the elastic modulus;
determining a compensation temperature of the overhead line in a second state according to the equivalent elastic modulus and a reference stress, wherein the reference stress is determined by the initial stress, the initial specific load, the initial air temperature, the annual average specific load and the annual average air temperature;
determining a target stress of the overhead line in a third state according to the target specific load, the target air temperature and the compensation temperature;
the first state is an initial state of the overhead line after the overhead line is erected, the second state is an average running state of the overhead line in years, the third state is a running state that initial elongation of the overhead line is the target initial elongation, and the target initial elongation is initial elongation corresponding to the target stress.
In a second aspect, an embodiment of the present invention further provides an overhead line stress temperature change compensation device, including:
the acquisition module is used for acquiring target parameters of the overhead line to be detected, wherein the target parameters comprise preset stress, preset initial elongation corresponding to the preset stress, elastic modulus, initial stress in a first state, initial specific load in the first state, initial air temperature in the first state, annual average specific load in a second state, annual average air temperature in the second state, target specific load in a third state and target air temperature in the third state;
the first determining module is used for determining the equivalent elastic modulus of the overhead line according to the preset stress, the preset initial elongation and the elastic modulus;
the second determining module is used for determining the compensation temperature of the overhead line in a second state according to the equivalent elastic modulus and a reference stress, wherein the reference stress is determined by the initial stress, the initial specific load, the initial air temperature, the annual average specific load and the annual average air temperature;
the third determining module is used for determining target stress of the overhead line in a third state according to the target specific load, the target air temperature and the compensation temperature;
the first state is an initial state of the overhead line after the overhead line is erected, the second state is an average running state of the overhead line in years, the third state is a running state that initial elongation of the overhead line is the target initial elongation, and the target initial elongation is initial elongation corresponding to the target stress.
In a third aspect, an embodiment of the present invention further provides an overhead line stress temperature change compensation device, including a processor, a memory, and a computer program stored on the memory and executable on the processor, where the computer program when executed by the processor implements the steps of the overhead line stress temperature change compensation method as described above.
In a fourth aspect, an embodiment of the present invention further provides a computer readable storage medium having a computer program stored thereon, wherein the computer program when executed by a processor implements the steps of any one of the above mentioned overhead line stress temperature change compensation methods.
According to the embodiment of the invention, the target parameters of the overhead line to be detected are obtained; determining the equivalent elastic modulus of the overhead line according to the preset stress, the preset initial elongation and the elastic modulus; determining a compensation temperature of the overhead line in a second state according to the equivalent elastic modulus and a reference stress, wherein the reference stress is determined by an initial stress, an initial specific load, an initial air temperature, an annual average specific load and an annual average air temperature; and determining the target stress of the overhead line in the third state according to the target specific load, the target air temperature and the compensation temperature. In this way, the non-constant compensation temperature of the overhead line under the actual stress is determined, and the actual stress of the overhead line is calculated according to the compensation temperature, so that the accuracy of stress calculation is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic illustration of the stress and elongation of an overhead line in various situations in an embodiment of the present invention;
FIG. 2 is a schematic flow chart of an overhead line temperature change compensation method in an embodiment of the invention;
FIG. 3 is a schematic illustration of the tension and initial elongation of an overhead line in various situations in an embodiment of the present invention;
FIG. 4 is a schematic illustration of the tension and initial elongation of the overhead line at deflection for various situations in an embodiment of the present invention;
fig. 5 is a block diagram of an overhead line stress detecting device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any creative effort, shall fall within the protection scope of the present invention.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
Under stress, the overhead wire is elastically deformed and inelastically deformed, wherein the elongation of the overhead wire due to the inelastically deformation is referred to as initial elongation, the elongation of the overhead wire due to the elastically deformation is referred to as elastic elongation, and the higher the elongation of the overhead wire due to the elastically deformation and/or inelastically deformation is, the higher the elongation of the overhead wire is.
The overhead line manufacturer can measure the elongation of the overhead line under different tensile forces to obtain an initial characteristic curve and a long-term creep characteristic curve of the overhead line. The initial characteristic curve can reflect the plastic elongation of the overhead line under different tensile forces; the long-term creep characteristic curve can further reflect the creep elongation of the overhead line under the long-term tension effect, and the actual elongation of the overhead line under the stress is obtained according to the 2 curves.
Because of the differences in other aspects of materials, sizes and the like of each overhead line in the production process, the initial characteristic curve and the long-term creep characteristic curve of each overhead line are different. In actual production activities, it is also impossible for overhead line manufacturers to test each overhead line produced to obtain an initial characteristic curve and a long-term creep characteristic curve of each overhead line. Therefore, the temperature compensation of the overhead line is performed according to the initial characteristic curve and the long-term creep characteristic curve of the overhead line, and the method has difficulty in popularization.
The method for compensating the temperature change of the overhead line stress provided by the embodiment of the application is described in detail through specific embodiments and application scenes thereof with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic diagram showing stress and elongation of an overhead line in different situations according to an embodiment of the present invention. As shown, the abscissa in fig. 1 represents the elongation of the overhead line, the ordinate represents the overhead line stress, and 5 curves are included in fig. 1.
The elastic elongation curve is the relationship between the stress and the elongation of the overhead line under the condition that the overhead line does not generate inelastic deformation.
The constant cooling compensation curve is the relationship between the stress and the elongation of the overhead line when the elongation caused by the initial elongation of the overhead line is a constant value.
The initial characteristic curve and the long-term creep characteristic curve are obtained by respectively testing the elongation of the overhead line under different instantaneous tensile forces and the creep elongation of the overhead line under the long-term tensile forces by an overhead line manufacturer.
The temperature change compensation curve is a relationship between the stress and the elongation of the overhead line, which is obtained by sampling the overhead line stress temperature change compensation method provided by the embodiment of the invention.
In the constant temperature-decreasing compensation curve, the elongation caused by the initial elongation of the overhead line is a constant value, and then the initial elongation corresponding to the elongation is also a constant value, that is, ε in FIG. 1 C Represents the initial elongation corresponding to a constant elongation; in the temperature change compensation curve, the elongation caused by the initial elongation of the overhead line changes along with the stress.
As can be seen from FIG. 1, σ is on the ordinate u In the case of (2), the ordinate corresponding to the elastic elongation curve is ε D Namely, the initial elongation of the overhead line caused by elastic deformation is epsilon D 。
In the ordinate sigma u In the case of (2), the abscissa corresponding to the constant cooling compensation curve is ε E In other words, in the constant temperature reduction compensation curve, the initial elongation of the overhead line due to inelastic deformation is (. Epsilon.) E -ε D ) It should be understood that since the elongation amount due to the initial elongation of the overhead line in the constant temperature-decrease compensation curve is a constant value, therefore (ε) E -ε D ) Equal to epsilon C 。
In the ordinate sigma u In the case of (2), the abscissa corresponding to the temperature change compensation curve is epsilon F In other words, in the temperature change compensation curve, the initial elongation of the overhead line due to inelastic deformation is (. Epsilon.) F -ε D )。
In the ordinate sigma u In (2), the abscissa corresponding to the long-term creep characteristic curve is ε G In practice, the initial elongation of the overhead line due to inelastic deformation is (. Epsilon G -ε D )。
In the ordinate sigma n Under the condition of (1), the abscissa corresponding to the temperature change compensation curve, the long-term creep characteristic curve and the constant temperature reduction compensation curve are the same and are epsilon H 。
As can be seen from fig. 1, the initial elongation obtained by the temperature change compensation curve is closer to the initial elongation pointed by the long-term creep characteristic curve than the constant temperature decrease compensation curve, that is, the temperature change compensation curve is more in line with the actual situation of the overhead line under different stresses.
Referring to fig. 2, fig. 2 is a flow chart of an overhead line temperature change compensation method according to an embodiment of the present invention, and the overhead line detection method provided by the embodiment includes the following steps:
s110, obtaining target parameters of an overhead line to be detected, wherein the target parameters comprise preset stress, preset initial elongation corresponding to the preset stress, elastic modulus, initial stress in a first state, initial specific load in the first state, initial air temperature in the first state, annual average specific load in a second state, annual average air temperature in the second state, target specific load in a third state and target air temperature in the third state.
In this embodiment, after the overhead line is wired, stress measurement may be performed on the overhead line to obtain an initial stress of the overhead line.
The preset stress of the overhead line, the preset initial elongation of the overhead line corresponding to the preset stress and the elastic modulus of the overhead line are all related to the material of the overhead line, and are all parameters of the overhead line which can be measured through experiments in the production process.
The preset stress of the overhead line is 10% -30% of the maximum breaking force of the overhead line, and the maximum breaking force of the overhead line is the maximum tensile force of the overhead line, which is measured through experiments in the production process.
It should be noted that, the first state in the present embodiment is an initial state of the overhead line after the overhead line is wired; the second state is the annual average running state of the overhead line, and it is to be understood that the annual average running state, the annual average specific load and the annual average air temperature of the overhead line are all general terms in the art, and are not specifically explained herein; the third state is an operation state in which the initial elongation of the overhead line is a target initial elongation, and the target initial elongation is an initial elongation corresponding to a target stress, that is, when the actual initial elongation is equal to the target initial elongation in a case in which the stress actually applied to the overhead line is the target stress.
The specific load of the overhead line in this embodiment refers to a value obtained by converting a load on the overhead line of a unit length to a value on a unit cross-sectional area, and the specific load of the overhead line is affected when the overhead line is iced and/or when the overhead line is affected by wind power.
The air temperature of the overhead wire is the temperature of the overhead wire when the overhead wire is in operation, and in general, the air temperature of the overhead wire is reduced, the length of the overhead wire is shortened, and wire breakage can be caused; the temperature of the overhead line is increased, the line length is increased, the sag is increased, the distance between the lowest point of the overhead line and the ground is reduced, and potential safety hazards exist.
S120, determining the equivalent elastic modulus of the overhead line according to the preset stress, the preset initial elongation and the elastic modulus.
Creep elongation of overhead lines under different stresses, i.e. the long-term creep characteristic curve in fig. 1, can be determined by the formula σ=e c Epsilon is expressed, wherein sigma in the above formula is the overhead line stress, epsilon is the initial elongation of the overhead line, E c Is the equivalent elastic modulus.
Furthermore, it can be based on
Determining the equivalent elastic modulus;
wherein E is c E is the elastic modulus, sigma c For the preset stress, Δε c And (5) the equivalent elastic modulus of the initial elongation is preset.
Further, in this embodiment, a first overhead wire state equation is further preset, and after the equivalent elastic modulus is obtained, an initial stress, an initial specific load and an initial air temperature of the overhead wire in a first state, and an annual average specific load of the overhead wire in a second state and an annual average air temperature of the overhead wire in the second state are input into the first overhead wire state equation to obtain a reference stress of the overhead wire in the second state.
The first overhead line state equation is:
wherein sigma j For the initial stress, gamma j For the initial specific load, t j Is saidInitial air temperature, sigma k For the reference stress, gamma k For the annual average specific load, t k For the annual average air temperature, E is the elastic modulus, l is a preset span, alpha is a preset temperature expansion coefficient, and beta is a preset height difference.
If the temperature of the overhead line in the first state is the same as the temperature of the overhead line in the second state, the initial stress of the overhead line in the first state is determined to be equal to the reference stress of the overhead line in the second state, wherein the reference stress can be the actual stress of the overhead line after the preset time period of the overhead line.
S130, determining the compensation temperature of the overhead line in the second state according to the equivalent elastic modulus and the reference stress.
In this embodiment, the equivalent elastic modulus of the overhead wire and the reference stress of the overhead wire in the second state system may be input to the formula
And obtaining the equivalent initial elongation of the overhead line in the second state. Wherein, delta epsilon k For equivalent initial elongation, E c Is equivalent elastic modulus, E is elastic modulus, sigma k Is the reference stress.
Because the temperature of the overhead wire is reduced and the length of the overhead wire is shortened, a corresponding temperature can be obtained according to the initial elongation of the overhead wire, the temperature is called as compensation temperature, and the overhead wire is cooled by using the compensation temperature, so that the potential safety hazard caused by the reduction of the ground distance of the overhead wire due to the initial elongation of the overhead wire is eliminated.
According to the formula
Obtaining a compensation temperature of the overhead line in the second state, wherein deltat k Is the compensation temperature, delta epsilon k Is equivalent initial elongation, and alpha is a preset temperature expansion coefficient.
And S140, determining the target stress of the overhead line in a third state according to the target specific load, the target air temperature and the compensation temperature.
In this embodiment, a second overhead line state equation is further preset, and after the equivalent elastic modulus is obtained, the initial stress, the initial specific load and the initial air temperature of the overhead line in the first state, and the target specific load and the target air temperature of the overhead line in the third state are input into the second overhead line state equation, so as to obtain the target stress of the overhead line in the third state.
The second overhead line state equation is:
wherein sigma j Gamma is the initial stress j To be initially loaded, t j For initial air temperature, sigma 1 For the target stress, gamma 1 For target specific load, t 1 For the target air temperature, E is the elastic modulus, l is the preset span, alpha is the preset temperature expansion coefficient, beta is the preset height difference, deltat k To compensate for temperature.
According to the embodiment of the invention, the target parameters of the overhead line to be detected are obtained; determining the equivalent elastic modulus of the overhead line according to the preset stress, the preset initial elongation and the elastic modulus; determining a compensation temperature of the overhead line in a second state according to the equivalent elastic modulus and a reference stress, wherein the reference stress is determined by an initial stress, an initial specific load, an initial air temperature, an annual average specific load and an annual average air temperature; and determining the target stress of the overhead line in the third state according to the target specific load, the target air temperature and the compensation temperature. In this way, the non-constant compensation temperature of the overhead line under the actual stress is determined, and the actual stress of the overhead line is calculated according to the compensation temperature, so that the accuracy of stress calculation is improved.
The embodiment of the invention also takes a stress test scene of an overhead line as an example, and describes the technical effects of the scheme.
The parameters of the overhead line are shown in table one.
Table one:
| section mm | Single N/m | Breaking force N | Modulus of elasticity Mpa | Temperature coefficient of expansion/. Degree.C |
| 468.644 | 15.9657 | 140119 | 69636.9 | 18.819e-06 |
Further, an overhead line shown in table one may be employed as the overhead line to be detected.
Referring to fig. 3, fig. 3 is a schematic diagram showing the tension and initial elongation of the overhead line according to the embodiment of the invention.
Fig. 3 includes 3 curves showing the relationship between the overhead wire tension and the initial elongation in 3 cases of the overhead wire to be detected described above, respectively. Wherein the overhead wire tension is related to the stress of the overhead wire, in particular, the overhead wire tension is the section-wise stress of the overhead wire.
The curve 1 may be a relationship curve between the tension and the initial elongation of the overhead wire obtained by using the stress temperature change compensation method provided by the embodiment of the invention.
Curve 2 may be a relationship curve between the overhead wire tension and the initial elongation obtained when the initial elongation of the overhead wire is a constant value.
The curve 3 may be a relationship curve between the wire tension and the initial elongation obtained according to the initial characteristic curve and the long-term creep characteristic curve of the overhead wire to be detected.
Since the initial characteristic curve and the long-term creep characteristic curve of the overhead line can reflect the plastic elongation and the creep elongation of the overhead line, that is, the tension and the initial elongation obtained by the curve 3 are more in line with the actual condition of the overhead line, the curve 3 can be used as a reference curve to judge which of the curve 1 and the curve 2 is closer to the actual condition of the overhead line.
As can be seen from fig. 3, when the overhead line tension is 35000, the initial elongation corresponding to the curve 3 is 0.06, the initial elongation corresponding to the curve 1 is 0.052, and the initial elongation corresponding to the curve 2 is 0.038. Because 0.052 is closer to 0.06, the initial elongation obtained by the method provided by the embodiment of the invention is closer to the real state of the overhead line.
Further, referring to fig. 4, fig. 4 is a schematic diagram of tension and tension deviation rate of an overhead line in different situations according to an embodiment of the present invention.
Fig. 4 includes 2 curves. Curve 4 may be a relationship curve between the tension and the tension deviation rate of the overhead line obtained by using the method provided by the embodiment of the present invention.
The curve 5 may be a relationship curve between the overhead wire tension and the tension deviation rate obtained when the initial elongation of the overhead wire is a constant value.
The higher the tension deviation rate, the larger the difference between the obtained wire tension and the actual tension, and the more inaccurate the wire tension.
As can be seen from fig. 4, when the overhead wire tension is 35000, the tension deviation rate corresponding to the curve 4 is 0.8; the tension offset corresponding to curve 5 is 5.8. Because the tension deviation rate corresponding to the curve 4 is smaller than the tension deviation rate corresponding to the curve 5, the stress obtained by applying the method provided by the embodiment of the invention is more approximate to the real state of the overhead line.
Referring to fig. 5, fig. 5 is a block diagram of an overhead line stress temperature varying compensation device 200 according to an embodiment of the present invention, and as shown in fig. 5, the overhead line stress temperature varying compensation device 200 includes:
an obtaining module 210, configured to obtain target parameters of an overhead line to be detected, where the target parameters include a preset stress, a preset initial elongation corresponding to the preset stress, an elastic modulus, an initial stress in a first state, an initial specific load in the first state, an initial air temperature in the first state, an annual average specific load in a second state, an annual average air temperature in the second state, a target specific load in a third state, and a target air temperature in the third state;
a first determining module 220, configured to determine an equivalent elastic modulus of the overhead line according to the preset stress, the preset initial elongation, and the elastic modulus;
a second determining module 230, configured to determine a compensation temperature of the overhead line in a second state according to the equivalent elastic modulus and a reference stress, where the reference stress is determined by the initial stress, the initial specific load, the initial air temperature, the annual average specific load, and the annual average air temperature;
and a third determining module 240, configured to determine a target stress of the overhead line in a third state according to the target specific load, the target air temperature, and the compensation temperature.
Optionally, the first determining module 220 is specifically configured to:
according to
Determining the equivalent elastic modulus;
wherein E is c E is the elastic modulus, sigma c For the preset stress, Δε c And the preset initial elongation is the preset initial elongation.
Optionally, the overhead line stress detecting device 200 further includes:
a fourth determination module 250 for, according to
Determining the referenceStress;
wherein sigma j For the initial stress, gamma j For the initial specific load, t j Sigma for the initial air temperature k For the reference stress, gamma k For the annual average specific load, t k For the annual average air temperature, E is the elastic modulus, l is a preset span, alpha is a preset temperature expansion coefficient, and beta is a preset height difference.
Optionally, the second determining module 240 is specifically configured to:
according to
Determining the equivalent initial elongation;
dividing the equivalent initial elongation by a preset temperature expansion coefficient to obtain the compensation temperature;
wherein, delta epsilon k For the equivalent initial elongation, E c E is the elastic modulus, sigma k Is the reference stress.
Optionally, the third determining module 250 is specifically configured to:
according to
Determining the target stress;
wherein sigma j For the initial stress, gamma j For the initial specific load, t j Sigma for the initial air temperature 1 For the target stress, gamma 1 For the target specific load, t 1 For the target air temperature, E is the elastic modulus, l is a preset gear distance, alpha is a preset temperature expansion coefficient, beta is a preset height difference, deltat k For the compensation temperature.
The overhead line stress temperature change compensation device 200 provided in the embodiment of the present invention can implement each process implemented by the overhead line stress temperature change compensation method in the method embodiment in fig. 2, and in order to avoid repetition, a description is omitted here.
The embodiment of the invention also provides a computer readable storage medium, and a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the processes of the overhead line stress variable temperature compensation method embodiment are realized, the same technical effects can be achieved, and the repetition is avoided, so that the repeated description is omitted. Wherein the computer readable storage medium is selected from Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk.
It should be noted that, in this document, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (10)
1. The overhead line stress variable temperature compensation method is characterized by comprising the following steps of:
acquiring target parameters of an overhead line to be detected, wherein the target parameters comprise preset stress, preset initial elongation corresponding to the preset stress, elastic modulus, initial stress in a first state, initial specific load in the first state, initial air temperature in the first state, annual average specific load in a second state, annual average air temperature in the second state, target specific load in a third state and target air temperature in the third state;
determining an equivalent elastic modulus of the overhead line according to the preset stress, the preset initial elongation and the elastic modulus;
determining a compensation temperature of the overhead line in a second state according to the equivalent elastic modulus and a reference stress, wherein the reference stress is determined by the initial stress, the initial specific load, the initial air temperature, the annual average specific load and the annual average air temperature;
determining a target stress of the overhead line in a third state according to the target specific load, the target air temperature and the compensation temperature;
the first state is an initial state of the overhead line after the overhead line is erected, the second state is an average running state of the overhead line in years, the third state is a running state that initial elongation of the overhead line is target initial elongation, and the target initial elongation is initial elongation corresponding to the target stress.
2. The overhead wire stress temperature change compensation method of claim 1, wherein the determining the equivalent elastic modulus of the overhead wire based on the preset stress, the preset initial elongation, and the elastic modulus comprises:
according to
Determining the equivalent elastic modulus;
wherein E is c E is the elastic modulus, sigma c For the preset stress, Δε c And the preset initial elongation is the preset initial elongation.
3. The overhead wire stress temperature swing compensation method of claim 1, wherein the determining the compensation temperature of the overhead wire in the second state is preceded by determining the compensation temperature of the overhead wire in the second state based on the equivalent elastic modulus and a reference stress, the method further comprising:
according to
Determining the reference stress;
wherein sigma j For the initial stress, gamma j For the initial specific load, t j Sigma for the initial air temperature k For the reference stress, gamma k For the annual average specific load, t k For the annual average air temperature, E is the elastic modulus, l is a preset span, alpha is a preset temperature expansion coefficient, and beta is a preset height difference.
4. The overhead wire stress temperature change compensation method of claim 1, wherein determining the compensation temperature of the overhead wire in the second state based on the equivalent elastic modulus and the reference stress comprises:
according to
Determining the equivalent initial elongation;
dividing the equivalent initial elongation by a preset temperature expansion coefficient to obtain the compensation temperature;
wherein, delta epsilon k For the equivalent initial elongation, E c E is the elastic modulus, sigma k Is the reference stress.
5. The overhead line stress temperature swing compensation method of claim 1, wherein determining the target stress of the overhead line in the third state based on the target specific load, the target air temperature, and the compensation temperature comprises:
according to
Determining the target stress;
wherein sigma j For the initial stress, gamma j For the initial specific load, t j Sigma for the initial air temperature 1 For the target stress, gamma 1 For the target specific load, t 1 For the target air temperature, E is the elastic modulus, l is a preset gear distance, alpha is a preset temperature expansion coefficient, beta is a preset height difference, deltat k For the compensation temperature.
6. An overhead line stress temperature change compensation device, characterized in that the stress temperature change compensation device comprises:
the acquisition module is used for acquiring target parameters of the overhead line to be detected, wherein the target parameters comprise preset stress, preset initial elongation corresponding to the preset stress, elastic modulus, initial stress in a first state, initial specific load in the first state, initial air temperature in the first state, annual average specific load in a second state, annual average air temperature in the second state, target specific load in a third state and target air temperature in the third state;
the first determining module is used for determining the equivalent elastic modulus of the overhead line according to the preset stress, the preset initial elongation and the elastic modulus;
the second determining module is used for determining the compensation temperature of the overhead line in a second state according to the equivalent elastic modulus and a reference stress, wherein the reference stress is determined by the initial stress, the initial specific load, the initial air temperature, the annual average specific load and the annual average air temperature;
the third determining module is used for determining target stress of the overhead line in a third state according to the target specific load, the target air temperature and the compensation temperature;
the first state is an initial state of the overhead line after the overhead line is erected, the second state is an average running state of the overhead line in years, the third state is a running state that initial elongation of the overhead line is target initial elongation, and the target initial elongation is initial elongation corresponding to the target stress.
7. The overhead line stress temperature change compensation device of claim 6, wherein the first determination module is specifically configured to:
according to
Determining the equivalent elastic modulus;
wherein E is c E is the elastic modulus, sigma c For the preset stress, Δε c And the preset initial elongation is the preset initial elongation.
8. The overhead line stress temperature change compensation device of claim 6, wherein the second determination module is specifically configured to:
according to
Determining the equivalent initial elongation;
dividing the equivalent initial elongation by a preset temperature expansion coefficient to obtain the compensation temperature;
wherein, delta epsilon k For the equivalent initial elongation, E c E is the elastic modulus, sigma k Is the reference stress.
9. The overhead line stress temperature change compensation device of claim 6, wherein the third determination module is specifically configured to:
according to
Determining the target stress;
wherein sigma j For the initial stress, gamma j For the initial specific load, t j Sigma for the initial air temperature 1 For the target stress, gamma 1 For the target specific load, t 1 For the target air temperature, E is the elastic modulus, l is a preset gear distance, alpha is a preset temperature expansion coefficient, beta is a preset height difference, deltat k For the compensation temperature.
10. A readable storage medium, characterized in that it has stored thereon a program or instructions which, when executed by a processor, implement the steps of the overhead line stress temperature swing compensation method according to any one of claims 1-5.
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