CN106960095A - A kind of method and system for determining wire creep rate - Google Patents

Abstract

The invention discloses a method for determining the creep rate of a wire. The method includes: obtaining the time period parameter of the wire; substituting the time period parameter into a database to determine the creep rate of the wire; the database is preset with a wire The relationship between the creep rate and different time periods; the database is established in the following way: using the sag increment of the wire to determine the line length increment of the wire; carrying out the standard conversion of the temperature and tension to the line length increment, and converting it into Standard wire length increment; obtain the standard wire length increment of the wire in different time periods, calculate the creep rate of the wire in different time cycles; analyze the creep rates of different wires in different time cycles, and confirm the creep rate of the wire In relation to different time periods, a database of the different time periods and the wire creep rate is established; based on the database, the wire creep rates of different time periods are determined.

Description

Method and system for determining wire creep rate

technical field

The invention relates to the field of power transmission and transformation engineering, and more specifically, to a method and system for determining the creep rate of a wire.

Background technique

With the rapid development of the national economy, the demand for electricity in all walks of life is increasing, and the requirements for the quality (stability, uninterrupted and accompanying services) of power supply provided by the power supply department are also getting higher and higher. Therefore, long-distance The safety of the power grid operation of high-voltage transmission lines is particularly important. Transmission lines are an important part of the power system. At present, there is a serious shortage of power in my country. Traditional capacity-increasing technologies such as heat-resistant wires and increasing the cross-sectional area of wires have problems such as long construction periods, difficulty in requisitioning transmission corridors, and high cost. Many existing transmission lines are already under high-load operation status, and the high-load operation status puts forward strict tests on the parameters of the conductors, especially in hot summer, which will increase the temperature of the conductors, resulting in the failure of the conductors. The increased sag puts the conductor in an unsafe operating state.

my country's overhead transmission line design regulations require the use of the cooling method to compensate the plastic creep elongation of the ground wire, but the existing line design regulations only give the estimated value of the elongation and the The corresponding cooling value range, but there is no clear regulation on the plastic creep elongation of the large cross-section wire and the corresponding lowering temperature value. At present, the cooling values of large-section conductors that have been put into engineering applications are calculated based on the analysis and calculation of conductor creep data, and there is a lack of long-term observation data collection and analysis of large-section conductor sag. At home and abroad, the analysis of creep characteristics of conductors is still dominated by quasi-static analysis. There are few reports on the systematic quantitative analysis of the entire life cycle of ground conductors from unwinding, erection, tightening to operation, and all of them are based on experimental analysis. Mainly, there is a lack of accurate numerical calculation models.

The prior art (CN: 201610654029.0) discloses a method for calculating the creep amount of conductors during the tension setting-out process during the construction of overhead transmission lines. However, since the specifications and types of wires used in each UHVDC transmission line are different, the structural parameters such as the length of the tensile section, the span, the height difference of the hanging point, and the string of insulator fittings are also very different. For the sag value observation data, it is necessary to establish a unified data analysis platform to improve the utilization rate of the sag value and to directly deduce the creep rate of the wire at different times.

Therefore, a technology is needed to solve the problem of measuring the standard creep rate based on the long-term creep deformation of the wire observed by the sag value.

Contents of the invention

The invention provides a method and a system for determining the creep rate of a wire to solve the problem of measuring the standard creep rate of the long-term creep deformation of the wire based on the observation of the sag value.

In order to solve the above problems, the present invention provides a method for determining the creep rate of a wire, the method comprising:

Obtain the time period parameter of the wire;

Substituting the time period parameters into the database to determine the wire creep rate; the database is preset with the relationship between the wire creep rate and different time periods; the database is established as follows:

Use the sag increment of the wire to determine the wire length increment of the wire;

Carry out the standard conversion of temperature and tension to the line length increment, and convert it into a standard line length increment;

Obtaining the standard line length increments of the wires in different time periods, and calculating the creep rates of the wires in different time periods;

Analyzing the creep rates of different wires in different time periods, confirming the relationship between the creep rates of the wires and different time periods, and establishing a database of the different time periods and the creep rates of the wires;

Based on the database, creep rates of the wire are determined for different time periods.

Preferably, the sag increment of the wire is the difference between the sag value of the wire when observed and the sag value of the wire when the wire is tight.

Preferably, the incremental step of determining the wire length of the wire includes: the wire span is 1, and the height difference angle between the two suspension points is The height difference of the suspension points at both ends of the wire is h, and the line length increment ΔL caused by the sag increment Δf of the wire is expressed as formula (1):

Wherein, Δf=f _survey -f _tight is the sag increment between the sag value of described conductor when observing and the sag value of described conductor when tight line, unit is m;

is the self-gravity specific load of the tension insulator metal string, in N/(m·mm ² );

K is the connection coefficient considering the tension insulator metal string;

ΔL is the line length increment of the wire caused by the creep of the wire due to the sag increment, and the unit is m;

f is _measured as the sag value when the different time periods of the conductor are observed, and the unit is m;

f is the sag value when the different time periods of the wire are _tightened , and the unit is m;

is the height difference angle of the suspension point at both ends of the wire;

l is the span of the observation gear, the unit is m;

h is the height difference between the two suspension points of the wire in the observation position, the unit is m;

λ is the string length of the tension insulator string, the unit is m;

G ₀ is the self-gravity of the tension insulator string, the unit is N;

S is the cross-sectional area of the wire described in the observation file, and the unit is mm ² ;

E is the elastic modulus of the wire described in the observation gear;

f is the sag of conductor construction, the unit is m;

g is the self-weight specific load of the wire, in N/mm ² ;

g ₀ is the self-weight specific load of the insulator string, and the unit is N/mm ² .

Preferably, the connection coefficient K of the tension insulator fitting string includes:

When there is no connected tension string, K=1;

When one end is connected to the tension string,

When the tension strings are connected at both ends,

Preferably, the wire length increment of the wire is converted into a standard conversion of temperature and tension, such as formula (2):

Among them, ΔL _{is marked} as the standard line length increment under standard conditions after conversion of temperature and tension, that is, the creep value;

α is the temperature linear expansion coefficient of the wire described in the observation file;

Δτ is the difference between the ambient temperature when the sag value is observed and the ambient temperature when the line is tight;

Δσ is the difference between the running tension of the wire when the sag value is observed and the tension when the wire is tight;

E is the elastic modulus of the wire in the observation gear.

According to another aspect of the present invention, the present invention provides a system for determining the creep rate of a wire, the system comprising:

An acquisition unit, configured to acquire the time period parameter of the wire;

The analysis unit is used for substituting the time period parameters into the database to determine the wire creep rate; the database is preset with the relationship between the wire creep rate and different time periods; the database is established in the following way: using the wire The sag increment determines the line length increment of the wire; performs the standard conversion of the temperature and tension on the line length increment, and converts it into a standard line length increment; obtains the standard line length increment of the wire in different time periods, and calculates The creep rates of the wires in different time periods; analyzing the creep rates of different wires in different time periods, confirming the relationship between the creep rates of the wires and different time periods, and establishing the relationship between the different time periods and the creep rates of the wires database;

Based on the database, creep rates of the wire for different time periods can be determined.

Preferably, the sag increment of the wire is the difference between the sag value of the wire when observed and the sag value of the wire when the wire is tight.

Preferably, the system further includes an establishment unit, which is used to establish the database preset with the relationship between the wire creep rate and different time periods, and the establishment unit is also used to determine the wire length increment of the wire, including: the The wire span is l, and the height difference angle between the two suspension points is The height difference of the suspension points at both ends of the wire is h, and the line length increment ΔL caused by the sag increment Δf of the wire is expressed as formula (1):

Wherein, Δf=f _survey -f _tight is the sag increment between the sag value of described conductor when observing and the sag value of described conductor when tight line, unit is m;

is the self-gravity specific load of the tension insulator metal string, in N/(m·mm ² );

K is the connection coefficient considering the tension insulator metal string;

ΔL is the line length increment of the wire caused by the creep of the wire due to the sag increment, and the unit is m;

f is _measured as the sag value when the different time periods of the conductor are observed, and the unit is m;

f is the sag value when the different time periods of the wire are _tightened , and the unit is m;

is the height difference angle of the suspension point at both ends of the wire;

l is the span of the observation gear, the unit is m;

h is the height difference between the two suspension points of the wire in the observation position, the unit is m;

λ is the string length of the tension insulator string, the unit is m;

G ₀ is the self-gravity of the tension insulator string, the unit is N;

S is the cross-sectional area of the wire described in the observation file, and the unit is mm ² ;

E is the elastic modulus of the wire described in the observation gear;

f is the sag of conductor construction, the unit is m;

g is the self-weight specific load of the wire, in N/mm ² ;

g ₀ is the self-weight specific load of the insulator string, and the unit is N/mm ² .

Preferably, the connection coefficient K of the tension insulator fitting string includes:

When there is no connected tension string, K=1;

When one end is connected to the tension string,

When the tension strings are connected at both ends,

Preferably, the establishment unit is also used to convert the wire length increment of the wire into a standard conversion of temperature and tension, such as formula (2):

Among them, ΔL _{is marked} as the standard line length increment under standard conditions after conversion of temperature and tension, that is, the creep value;

α is the temperature linear expansion coefficient of the wire described in the observation file;

Δτ is the difference between the ambient temperature when the sag value is observed and the ambient temperature when the line is tight;

Δσ is the difference between the running tension of the wire when the sag value is observed and the tension when the wire is tight;

E is the elastic modulus of the wire in the observation gear.

In order to conduct a unified analysis of the sag value of the wire in the technical solution of the present invention, firstly, the sag value increment of the wire is converted into the wire length increment of the wire, and at the same time, the temperature and tension factors that affect the creep rate of the wire are converted into standards to obtain The standard line length increment, that is, the creep amount. The creep rate of different wires in different time periods is obtained by calculation, and the creep rate is divided by the creep amount and the original wire length when the wire is tight. The invention establishes a creep rate data analysis platform for different time periods with unified standards for different wires, and determines the relationship between the creep rate and the time period. The invention can utilize the determined relationship between the creep rate and the time period to deduce the creep rate of the wires in different time periods.

Description of drawings

A more complete understanding of the exemplary embodiments of the present invention can be had by referring to the following drawings:

Fig. 1 is a kind of flow chart of the method for determining wire creep rate according to an embodiment of the present invention; And

Fig. 2 is a structural diagram of a system for determining creep rate of wires according to an embodiment of the present invention.

detailed description

Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units/elements are given the same reference numerals.

Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or overly formal meanings.

Fig. 1 is a flow chart of a method for determining the creep rate of a wire according to an embodiment of the present invention. According to the change relationship between the line length increment and the sag value, the embodiment of the present invention adopts the idea of reverse deduction to convert the sag value observation data based on different wire line parameters into the standard line length increment, and further uses the creep rate Measurement, finally reflect the sag value observation results of different parameter values of various conductor lines as the creep rate of the unified measurement unit. In order to conduct a unified analysis of the sag value of the wire, firstly, the sag value increment of the wire is converted into the wire length increment of the wire, and at the same time, the temperature and tension factors that affect the creep rate of the wire are converted into standard to obtain the standard wire length increment , that is, the amount of creep. The creep rate of different wires in different time periods is obtained by calculation, and the creep rate is divided by the creep amount and the original wire length when the wire is tight. The invention establishes a creep rate data analysis platform for different wires in different time periods under the unified standard condition, so as to determine the relationship between the creep rate and the time period. The invention utilizes the determined relationship between the creep rate and the time period to deduce the creep rate of the wires in different time periods. As shown in Figure 1, the method 100 starts from step 101:

Preferably, at step 101, a time period parameter of the wire is acquired.

Preferably, in step 102, the time period parameter is substituted into the database to determine the wire creep rate; the database is preset with the relationship between the wire creep rate and different time periods; the database is established in the following manner:

Use the sag increment of the wire to determine the wire length increment of the wire;

Carry out the standard conversion of temperature and tension for the line length increment, and convert it into the standard line length increment;

Obtain the standard line length increment of different time periods of the wire, and calculate the creep rate of the wire in different time periods;

The creep rate of different wires in different time periods is analyzed to confirm the relationship between the creep rate of wires and different time periods, and a database of different time periods and creep rates of wires is established.

Preferably, the sag increment of the wire is the difference between the sag value of the wire when observed and the sag value of the wire when the wire is tight.

In the embodiment of the present invention, the calculation step of determining the line length increment of lead comprises: the lead span is 1, and the height difference angle between two suspension points is The height difference of the suspension points at both ends of the wire is h, and the wire length increment ΔL caused by the wire sag increment Δf is expressed as formula (1):

Among them, Δf= _fmeasured - _ftight is the sag increment between the sag value of the conductor when observed and the sag value of the conductor when the wire is tightened, and the unit is m;

is the self-gravity specific load of the tension insulator metal string, in N/(m·mm ² );

K is the connection coefficient considering the tension insulator metal string;

When there is no connected tension string, K=1;

When one end is connected to the tension string,

When the tension strings are connected at both ends,

ΔL is the line length increment of the wire caused by the creep of the wire due to the sag increment, and the unit is m;

f is _measured as the sag value of the conductor when observed in different time periods, and the unit is m;

f _tight is the sag value of the wire when the wire is tight in different time periods, the unit is m;

is the height difference angle of the suspension point at both ends of the wire;

l is the span of the observation gear, the unit is m;

h is the height difference between the two suspension points of the observation gear wire, the unit is m;

λ is the string length of the tension insulator string, the unit is m;

G ₀ is the self-gravity of the tension insulator string, the unit is N;

S is the cross-sectional area of the observation gear wire, the unit is mm ² ;

E is the elastic modulus of the observation gear wire;

f is the sag of conductor construction, the unit is m;

g is the self-weight specific load of the wire, in N/mm ² ;

g ₀ is the self-weight specific load of the insulator string, and the unit is N/mm ² .

Preferably, in step 102, the wire length increment of the wire is converted into a standard wire length increment through standard conversion of temperature and tension.

In the embodiment of the present invention, carry out the standard conversion of temperature and tension to the line length increment of wire, as formula (2):

Among them, ΔL _{is marked} as the standard line length increment under standard conditions after conversion of temperature and tension, that is, the creep value;

α is the temperature linear expansion coefficient of the observation gear wire;

Δτ is the difference between the ambient temperature when the sag value is observed and the ambient temperature when the line is tight;

Δσ is the difference between the running tension of the wire when the sag value is observed and the tension when the wire is tight;

E is the elastic modulus of the observation gear wire.

Preferably, based on the database, creep rates of the wire for different time periods can be determined.

According to the embodiment of the present invention, the large-section conductor sag observation data of three UHV DC transmission lines of Ha-Zheng, Xi-Zhe and Ling-Shao are selected.

Table 1 Observation data of sag value of conductor with large cross-section on Harbin-Zhengjiang line

Table 1

Table 2 Observation data of sag value of large cross-section conductors on Xizhe line

Table 2

Table 3 Observation data of sag value of large-section conductors on Lingshao Line

table 3

The creep rate of the large cross-section wire in the observation gear can be obtained by dividing the converted creep value of the large-section wire in the observation gear by the original wire length when the wire is tightened. Changes in the creep rate of large sections observed by the sag value:

Table 4 Changes in creep rate of conductors converted from long-term sag value observation of large cross-section conductors (%)

Table 4

After the above data conversion, the observation data of sag value under different line parameters can be analyzed on a unified data platform. From the analysis results, it can be concluded that the creep amount released by each line with a large cross-section within a tight line is approximately equivalent to Half of the amount released within a year after tightening the line. This is also consistent with the creep calculation model based on the creep test analysis. Through the unified observation data processing method, the observation results of the sag value of each line based on different line gear parameters can be effectively placed on the same coordinate. System analysis can effectively improve data utilization. Through the embodiments of the present invention, creep rates of wires for different time periods can be derived.

The embodiment of the present invention solves the problem that the observation data of the sag value of conductors with large cross-sections in different lines is not convenient for analysis and comparison. The known sag value is established by using the sensitive relationship between the line length increment and the sag increment change and the inverse derivation formula. The incremental change of line length is inversely obtained from the observation data, and then the law of line length creep rate is obtained. The embodiment of the present invention converts the sag value observation results of each line based on different line parameters into the same coordinate system for analysis through a unified analysis and processing method, which effectively improves the utilization rate of data.

Fig. 2 is a structural diagram of a system for determining creep rate of wires according to an embodiment of the present invention. As shown in FIG. 2, a system 200 for determining the creep rate of a wire includes:

The obtaining unit 201 is configured to obtain the time period parameter of the wire.

The analysis unit 202 is used for substituting the time period parameters into the database to determine the wire creep rate; the database is preset with the relationship between the wire creep rate and different time periods; the database is established in the following way: using the sag increment of the wire to determine The line length increment of the wire; the standard conversion of the line length increment by temperature and tension is converted into the standard line length increment; the standard line length increment of the wire in different time periods is obtained, and the creep rate of the wire in different time periods is calculated; The creep rate of different wires in different time periods is analyzed to confirm the relationship between the creep rate of wires and different time periods, and a database of different time periods and creep rates of wires is established.

Based on the database, creep rates of the wire for different time periods can be determined.

Preferably, the sag increment of the wire is the difference between the sag value of the wire when observed and the sag value of the wire when the wire is tight.

Preferably, the system further includes an establishment unit for establishing the database preset with the relationship between the wire creep rate and different time periods, and the establishment unit is also used for determining the wire length increment of the wire including: the wire span is l, the height difference angle between the two suspension points is The height difference of the suspension points at both ends of the wire is h, and the wire length increment ΔL caused by the wire sag increment Δf is expressed as formula (1):

Among them, Δf= _fmeasured - _ftight is the sag increment between the sag value of the conductor when observed and the sag value of the conductor when the wire is tightened, and the unit is m;

is the self-gravity specific load of the tension insulator metal string, in N/(m·mm ² );

K is the connection coefficient considering the tension insulator metal string;

ΔL is the line length increment of the wire caused by the creep of the wire due to the sag increment, and the unit is m;

f is _measured as the sag value of the conductor when observed in different time periods, and the unit is m;

f _tight is the sag value of the wire when the wire is tight in different time periods, the unit is m;

is the height difference angle of the suspension point at both ends of the wire;

l is the span of the observation gear, the unit is m;

h is the height difference between the two suspension points of the observation gear wire, the unit is m;

λ is the string length of the tension insulator string, the unit is m;

G ₀ is the self-gravity of the tension insulator string, the unit is N;

S is the cross-sectional area of the observation gear wire, the unit is mm ² ;

E is the elastic modulus of the observation gear wire;

f is the sag of conductor construction, the unit is m;

g is the self-weight specific load of the wire, in N/mm ² ;

g ₀ is the self-weight specific load of the insulator string, and the unit is N/mm ² .

Preferably, the connection coefficient K of the tension insulator fitting string includes:

When there is no connected tension string, K=1;

When one end is connected to the tension string,

When the tension strings are connected at both ends,

Preferably, the establishment unit is also used to convert the wire length increment to a standard conversion of temperature and tension, such as formula (2):

Among them, ΔL _{is marked} as the standard line length increment under standard conditions after conversion of temperature and tension, that is, the creep value;

α is the temperature linear expansion coefficient of the observation gear wire;

Δτ is the difference between the ambient temperature when the sag value is observed and the ambient temperature when the line is tight;

Δσ is the difference between the running tension of the wire when the sag value is observed and the tension when the wire is tight;

E is the elastic modulus of the observation gear wire.

A system 200 for determining the creep rate of a wire in an embodiment of the present invention corresponds to a method 100 for determining a creep rate of a wire in another embodiment of the present invention, and details are not repeated here.

The invention has been described with reference to a small number of embodiments. However, it is clear to a person skilled in the art that other embodiments than the invention disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a/the/the [means, component, etc.]" are openly construed to mean at least one instance of said means, component, etc., unless expressly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Claims (10)

1. A method for determining wire creep rate, said method comprising: Obtain the time period parameter of the wire; Substituting the time period parameters into the database to determine the wire creep rate; the database is preset with the relationship between the wire creep rate and different time periods; the database is established as follows: Use the sag increment of the wire to determine the wire length increment of the wire; Carry out the standard conversion of temperature and tension to the line length increment, and convert it into a standard line length increment; Obtaining the standard line length increments of the wires in different time periods, and calculating the creep rates of the wires in different time periods; Analyzing the creep rates of different wires in different time periods, confirming the relationship between the creep rates of the wires and the different time periods, and establishing a database of the different time periods and the creep rates of the wires. 2. The method according to claim 1, wherein the sag increment of the wire is the difference between the sag value of the wire when observed and the sag value of the wire when the wire is tight. 3. The method according to claim 1, the line length increment step of the described determination wire comprises: the wire span is 1, and the height difference angle between two suspension points is The height difference of the suspension points at both ends of the wire is h, and the line length increment ΔL caused by the sag increment Δf of the wire is expressed as formula (1): Wherein, Δf=f _survey -f _tight is the sag increment between the sag value of described conductor when observing and the sag value of described conductor when tight line, unit is m; is the self-gravity specific load of the tension insulator metal string, in N/(m·mm ² ); K is the connection coefficient considering the tension insulator metal string; ΔL is the line length increment of the wire caused by the creep of the wire due to the sag increment, and the unit is m; f is _measured as the sag value when the different time periods of the conductor are observed, and the unit is m; f is the sag value when the different time periods of the wire are _tightened , and the unit is m; is the height difference angle of the suspension point at both ends of the wire; l is the span of the observation gear, the unit is m; h is the height difference between the two suspension points of the wire in the observation position, the unit is m; λ is the string length of the tension insulator string, the unit is m; G ₀ is the self-gravity of the tension insulator string, the unit is N; S is the cross-sectional area of the wire described in the observation file, and the unit is mm ² ; E is the elastic modulus of the wire described in the observation gear; f is the sag of conductor construction, the unit is m; g is the self-weight specific load of the wire, in N/mm ² ; g ₀ is the self-weight specific load of the insulator string, and the unit is N/mm ² . 4. The method according to claim 3, the connection coefficient K of the tension insulator fitting string comprises: When there is no connected tension string, K=1; When one end is connected to the tension string, When the tension strings are connected at both ends, 5. The method according to claim 3, said carrying out the standard conversion of temperature and tension to the said wire length increment of said wire, as formula (2): Among them, ΔL _{is marked} as the standard line length increment under standard conditions after conversion of temperature and tension, that is, the creep value; α is the temperature linear expansion coefficient of the wire described in the observation file; Δτ is the difference between the ambient temperature when the sag value is observed and the ambient temperature when the line is tight; Δσ is the difference between the running tension of the wire when the sag value is observed and the tension when the wire is tight; E is the elastic modulus of the wire in the observation gear. 6. A system for determining the creep rate of a wire, the system comprising: An acquisition unit, configured to acquire the time period parameter of the wire; The analysis unit is used for substituting the time period parameters into the database to determine the wire creep rate; the database is preset with the relationship between the wire creep rate and different time periods; the database is established in the following way: using the wire The sag increment determines the line length increment of the wire; performs the standard conversion of the temperature and tension on the line length increment, and converts it into a standard line length increment; obtains the standard line length increment of the wire in different time periods, and calculates The creep rates of the wires in different time periods; analyzing the creep rates of different wires in different time periods, confirming the relationship between the creep rates of the wires and different time periods, and establishing the relationship between the different time periods and the creep rates of the wires database. 7. The system according to claim 6, wherein the sag increment of the wire is the difference between the sag value of the wire when observed and the sag value of the wire when the wire is tight. 8. The system according to claim 6, further comprising an establishment unit for establishing the database preset with the relationship between the wire creep rate and different time periods, the establishment unit is also used for determining the wire creep rate The line length increment includes: the wire span is l, and the height difference angle between the two suspension points is The height difference of the suspension points at both ends of the wire is h, and the line length increment ΔL caused by the sag increment Δf of the wire is expressed as formula (1): Wherein, Δf=f _survey -f _tight is the sag increment between the sag value of described conductor when observing and the sag value of described conductor when tight line, unit is m; is the self-gravity specific load of the tension insulator metal string, in N/(m·mm ² ); K is the connection coefficient considering the tension insulator metal string; ΔL is the line length increment of the wire caused by the creep of the wire due to the sag increment, and the unit is m; f is _measured as the sag value when the different time periods of the conductor are observed, and the unit is m; f is the sag value when the different time periods of the wire are _tightened , and the unit is m; is the height difference angle of the suspension point at both ends of the wire; l is the span of the observation gear, the unit is m; h is the height difference between the two suspension points of the wire in the observation position, the unit is m; λ is the string length of the tension insulator string, the unit is m; G ₀ is the self-gravity of the tension insulator string, the unit is N; S is the cross-sectional area of the wire described in the observation file, and the unit is mm ² ; E is the elastic modulus of the wire described in the observation gear; f is the sag of conductor construction, the unit is m; g is the self-weight specific load of the wire, in N/mm ² ; g ₀ is the self-weight specific load of the insulator string, and the unit is N/mm ² . 9. The system according to claim 8, the connection coefficient K of the tension insulator fitting string comprises: When there is no connected tension string, K=1; When one end is connected to the tension string, When the tension strings are connected at both ends, 10. The system according to claim 8, the establishment unit is also used for standard conversion of the temperature and tension of the wire length increment of the wire, such as formula (2): Among them, ΔL _{is marked} as the standard line length increment under standard conditions after conversion of temperature and tension, that is, the creep value; α is the temperature linear expansion coefficient of the wire described in the observation file; Δτ is the difference between the ambient temperature when the sag value is observed and the ambient temperature when the line is tight; Δσ is the difference between the running tension of the wire when the sag value is observed and the tension when the wire is tight; E is the elastic modulus of the wire in the observation gear.