Conductor parameter acquisition method, device, electronic device and readable storage medium

Abstract

The present application provides a method, device, electronic device and readable storage medium for obtaining conductor parameters, wherein the method comprises: obtaining first parameter information of a transmission conductor, second parameter information under a first working condition, and a first sensitivity of wind load of the transmission conductor to stress under the first working condition and a second sensitivity of wind load of the transmission conductor to sag under the first working condition, wherein the first parameter information comprises the span, elastic modulus and temperature elongation coefficient of the transmission conductor, and the second parameter information comprises the stress, sag and insulator string swing angle of the transmission conductor corresponding to the first wind load; obtaining a third sensitivity of wind load of the transmission conductor to the insulator string swing angle under the first working condition; obtaining third parameter information under the second working condition, wherein the third parameter information comprises the stress, sag and insulator string swing angle of the transmission conductor corresponding to the second wind load. The present application can improve the efficiency of obtaining conductor stress, sag and insulator string swing angle.

Description

Technical Field

[0001] The present application relates to the field of power transmission technology, and in particular to a method, device, electronic device and readable storage medium for obtaining conductor parameters. Background Art

[0002] High-voltage overhead transmission lines are typical wind-sensitive structures, and wind load is one of the main control design loads. Changes in wind load will cause changes in overhead line stress, sag characteristics, and insulator string swing angles, thereby affecting the operation of the ground wire, the distance to the ground, and the tower head design. However, the design of high-voltage overhead transmission lines requires the calculation of conductor stress, sag, and insulator swing angles before and after wind load changes, which is inefficient. Summary of the invention

[0003] The embodiments of the present application provide a method, device, electronic device and readable storage medium for acquiring wire parameters to solve the problem of low efficiency in acquiring wire parameters.

[0004] In a first aspect, an embodiment of the present application provides a method for obtaining wire parameters, including:

[0005] Acquire first parameter information of the transmission line, second parameter information under a first working condition, and a first sensitivity of the wind load of the transmission line to stress under the first working condition and a second sensitivity of the wind load of the transmission line to sag under the first working condition, wherein the first parameter information includes the span, elastic modulus and temperature elongation coefficient of the transmission line, and the second parameter information includes the stress, sag and insulator string swing angle of the transmission line corresponding to the first wind load;

[0006] Based on the first sensitivity, obtaining a third sensitivity of the wind load of the transmission line to the swing angle of the insulator string under the first working condition;

[0007] Based on the first sensitivity, the second sensitivity, the third sensitivity, the first parameter information and the second parameter information, the third parameter information under the second working condition is obtained, wherein the third parameter information includes the stress, sag and insulator string sway angle of the transmission line corresponding to the second wind load.

[0008] In a second aspect, an embodiment of the present application further provides a wire parameter acquisition device, comprising:

[0009] A first acquisition unit is used to acquire first parameter information of the transmission line, second parameter information under a first working condition, and a first sensitivity of the wind load of the transmission line to stress under the first working condition and a second sensitivity of the wind load of the transmission line to sag under the first working condition, wherein the first parameter information includes the span, elastic modulus and temperature elongation coefficient of the transmission line, and the second parameter information includes the stress, sag and insulator string swing angle of the transmission line corresponding to the first wind load;

[0010] A second acquisition unit, configured to acquire, based on the first sensitivity, a third sensitivity of the wind load of the transmission line to the swing angle of the insulator string under the first working condition;

[0011] A third acquisition unit is used to acquire third parameter information under a second working condition based on the first sensitivity, the second sensitivity, the third sensitivity, the first parameter information and the second parameter information, wherein the third parameter information includes the stress, sag and insulator string sway angle of the transmission line corresponding to the second wind load.

[0012] In a third aspect, an embodiment of the present application further provides an electronic device, comprising: a memory, a processor, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps in the wire parameter acquisition method disclosed in the first aspect of the embodiment of the present application.

[0013] In a fourth aspect, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps in the wire parameter acquisition method disclosed in the first aspect of the embodiment of the present application are implemented.

[0014] Thus, in the embodiment of the present application, by obtaining the first sensitivity of the wind load of the transmission line to stress under the first working condition, the second sensitivity of the wind load of the transmission line to sag, and the third sensitivity of the wind load of the transmission line to the swing angle of the insulator string, the stress, sag and swing angle of the transmission line corresponding to the second wind load can be quickly obtained based on the stress, sag and swing angle of the insulator string corresponding to the first wind load, thereby improving the efficiency of obtaining the stress, sag and swing angle of the transmission line. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0016] Figure 1 It is a flow chart of a method for obtaining wire parameters provided in an embodiment of the present application;

[0017] Figure 2 It is a schematic diagram of stress variation with wind load provided in an embodiment of the present application;

[0018] Figure 3 This is a schematic diagram of the variation of the sway angle with wind load provided in an embodiment of the present application;

[0019] Figure 4 is another schematic diagram of the variation of the sway angle with wind load provided in an embodiment of the present application;

[0020] Figure 5 This is a schematic diagram of the change of sag with wind load provided in an embodiment of the present application;

[0021] Figure 6 is another schematic diagram of the variation of the sway angle with wind load provided in an embodiment of the present application;

[0022] Figure 7 It is a structural schematic diagram of a conductor parameter acquisition device provided in an embodiment of the present application;

[0023] Figure 8 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] See also Figure 1 , Figure 1 is a flow chart of a method for obtaining wire parameters provided in an embodiment of the present application, such as Figure 1 As shown, the following steps are included:

[0026] Step 101, obtaining first parameter information of the transmission line, second parameter information under a first operating condition, and a first sensitivity of the wind load of the transmission line to stress under the first operating condition and a second sensitivity of the wind load of the transmission line to sag under the first operating condition, wherein the first parameter information includes the span, elastic modulus and temperature elongation coefficient of the transmission line, and the second parameter information includes the stress, sag and insulator string sway angle of the transmission line corresponding to the first wind load.

[0027] The stress of the transmission line may specifically include the horizontal stress at the lowest point of the transmission line under the first working condition, and the second parameter information may also include the conductor load ratio, the temperature and wind speed of the first working condition, etc. Moreover, the horizontal stress at the lowest point of the transmission line and the conductor load ratio and other parameter information may change with the change of wind load under different working conditions.

[0028] The above-mentioned first operating condition can represent a control operating condition determined based on parameter information such as the horizontal stress at the lowest point of the known transmission line and the conductor load ratio. For example, under the operating condition of annual average temperature control, icing control or low temperature control, the conductor stress and conductor load ratio of the above-mentioned transmission line are known, so as to analyze the changes of parameters such as stress and sag of the above-mentioned transmission line with wind load.

[0029] It should be noted that the first sensitivity can indicate the change of the stress with the change of the wind load, and the second sensitivity can indicate the change of the sag with the change of the wind load. For example, if the first sensitivity is greater than zero, it means that the stress increases monotonically with the wind load; if the first sensitivity is less than zero, it means that the stress decreases monotonically with the wind load; if the first sensitivity is equal to zero, it means that the stress is not affected by the change of the wind load. The second sensitivity corresponds to the first sensitivity and will not be repeated here.

[0030] Among them, the above-mentioned first sensitivity and the above-mentioned second sensitivity both correspond to the first operating condition of the above-mentioned transmission line. For example, when the above-mentioned first operating condition is parameter information such as horizontal stress at the lowest point of the transmission line and conductor load ratio at a known annual average temperature, the above-mentioned first sensitivity can be the sensitivity corresponding to multiple operating conditions obtained according to the above-mentioned second parameter information. According to the above-mentioned first sensitivity, the above-mentioned parameter information under a certain operating condition can be quickly obtained along with the change of the wind load of the above-mentioned conductor, so as to determine the parameter information of the operating condition required for the design of the transmission line, and the structure of the above-mentioned transmission line can be designed according to the specific actual situation, so that the above-mentioned transmission line can be adapted to the local meteorological conditions to ensure the safe operation of the transmission line.

[0031] Step 102: Obtain a third sensitivity of the wind load of the transmission line to the sway angle of the insulator string under the first working condition based on the first sensitivity.

[0032] Specifically, the above-mentioned wind load may include tension wind load and yaw wind load. Due to differences in the calculation methods of conductor wind load, the above-mentioned tension wind load can be used to represent the wind load used for conductor stress and conductor sag calculation, and the above-mentioned yaw wind load can be used to represent the wind load used for yaw calculation. The tension wind load is used to obtain the above-mentioned first sensitivity and the above-mentioned second sensitivity, and when obtaining the above-mentioned third sensitivity, the above-mentioned tension wind load and the above-mentioned yaw wind load can be analyzed separately. For example: since the above-mentioned yaw wind load will not affect the conductor stress, the third sensitivity of the above-mentioned yaw wind load to the swing angle of the above-mentioned insulator string can be directly obtained according to the above-mentioned first sensitivity; the above-mentioned tension wind load affects the insulator swing angle by affecting the conductor tension, and has different effects on the above-mentioned conductor stress under different above-mentioned first working conditions. For example: under high temperature conditions, the conductor stress is not affected by changes in wind load, but under strong wind conditions, the conductor stress is affected by changes in wind load.

[0033] Among them, the above-mentioned third wind load can represent the change of the swing angle of the above-mentioned insulator string with the change of the above-mentioned wind load. The specific change corresponds to the above-mentioned first wind load and will not be repeated here. In addition, according to the above-mentioned first sensitivity, the above-mentioned second sensitivity and the above-mentioned third sensitivity, the change rules of the above-mentioned conductor stress, sag and the swing angle of the insulator string with the wind load can be obtained respectively, so as to confirm the conductor stress, sag and the swing angle of the insulator string and their change range.

[0034] Step 103: Based on the first sensitivity, the second sensitivity, the third sensitivity, the first parameter information and the second parameter information, obtain third parameter information under a second working condition, wherein the third parameter information includes stress, sag and insulator string sway angle of the transmission line corresponding to the second wind load.

[0035] Among them, the second working condition can be a variety of meteorological conditions that the transmission line may encounter. Correspondingly, the third parameter information can be information such as the horizontal stress at the lowest point of the transmission line under various meteorological conditions, the conductor sag, and the swing angle of the insulator string. The overhead transmission line design is performed based on the conductor parameter information obtained under various working conditions, which can improve the safety of the operation of the overhead transmission line. For example: according to whether the wind speed of the working condition exceeds a certain value, it can be divided into a strong wind working condition and a non-strong wind working condition. When the first working condition is a non-strong wind working condition, the second working condition can be a strong wind working condition; when the first working condition is a strong wind working condition, the second working condition can be a non-strong wind working condition, and the first working condition and the second working condition can also be both non-strong wind conditions or both strong wind conditions; according to whether the temperature of the working condition exceeds a certain value, it can also be divided into a high temperature working condition and a low temperature working condition.

[0036] Based on the above-mentioned first sensitivity, the above-mentioned second sensitivity, the above-mentioned third sensitivity, the above-mentioned first parameter information and the above-mentioned second parameter information, the above-mentioned third parameter information obtained may be the conductor parameter information under a certain extreme working condition, or may be the above-mentioned conductor parameter information under a certain common working condition, or may be the above-mentioned conductor parameter information under multiple working conditions simultaneously, which may be determined according to the needs in the actual project, and the present application does not impose any restrictions on this.

[0037] The difference between the first wind load and the second wind load can represent the change of the wind load. Correspondingly, the stress change, the sag change and the insulator string swing angle change caused by the change of the wind load can be determined respectively according to the first sensitivity, the second sensitivity and the third sensitivity, so as to obtain the stress, sag and insulator string swing angle of the transmission line after the wind load changes.

[0038] In the embodiment of the present application, by obtaining the first sensitivity of the wind load of the transmission line to stress under the first working condition, the second sensitivity of the wind load of the transmission line to sag, and the third sensitivity of the wind load of the transmission line to the swing angle of the insulator string, the transmission line stress, sag and insulator string swing angle corresponding to the second wind load can be quickly obtained based on the transmission line stress, sag and insulator string swing angle corresponding to the first wind load, thereby improving the efficiency of obtaining the transmission line stress, sag and insulator string swing angle.

[0039] In addition, designing the overhead transmission line based on the conductor parameter information such as conductor stress, sag and insulator string swing angle obtained under the second working condition can ensure the reliable operation of the transmission line.

[0040] Optionally, when the first operating condition is a non-strong wind operating condition and the second operating condition is a strong wind operating condition, the first sensitivity is greater than zero;

[0041] When the first operating condition is a strong wind condition and the second operating condition is a non-strong wind condition, the first sensitivity is less than zero.

[0042] Specifically, the above-mentioned strong wind conditions and non-strong wind conditions can be distinguished according to the meteorological conditions of the transmission line. The non-strong wind conditions may include annual average temperature conditions, icing conditions, low temperature conditions, etc. other than strong wind conditions. For example, when the above-mentioned first condition is the annual average temperature control condition and the above-mentioned second condition is the strong wind condition, the stress of the above-mentioned transmission line increases with the increase of wind load.

[0043] In addition, when both the first working condition and the second working condition are non-strong wind conditions, changes in tension wind load will not affect the conductor loads in known and unknown conditions, and thus the conductor stress remains unchanged; when both the first working condition and the second working condition are strong wind conditions, the strong wind stress under strong wind control is the maximum operating stress of the conductor, which is fixed. Therefore, the wind load in these two conditions will not affect the conductor stress, that is, the first sensitivity of the wind load of the transmission line to stress in the above two conditions is zero.

[0044] In this implementation, the first sensitivity may be used to determine a variation trend of the stress of the transmission line with wind load.

[0045] Optionally, when the first operating condition is a high wind condition and the second operating condition is a high temperature condition, the second sensitivity is greater than zero.

[0046] Specifically, in engineering design, the main concern is the sag of the conductor under the maximum temperature control condition. Under the strong wind control condition, the specific load of the high temperature condition to be determined is not affected by the change of wind load, and according to the above-mentioned first sensitivity, the influence of the stress of the high temperature condition to be determined on the change of wind load can be obtained, that is, the above-mentioned second sensitivity is obtained.

[0047] In addition, under non-strong wind control conditions, since the specific load and stress of the high temperature condition to be determined are not affected by the change of wind load, the sag is also not affected by the wind load, that is, the second sensitivity of the wind load of the transmission line to the sag is zero in the above case.

[0048] In this embodiment, the sag change of the transmission line can be determined based on the second sensitivity of the wind load of the transmission line to sag. During design, the clearance distance between the transmission line and buildings, trees, hillsides, etc. can be ensured, thereby improving the safety of personnel and facilities under the line.

[0049] Optionally, the third sensitivity includes a fourth sensitivity of the wind load of the transmission line to the swing angle of the insulator string and a fifth sensitivity of the tension wind load of the transmission line to the swing angle of the insulator string;

[0050] The step of obtaining the third sensitivity of the wind load of the transmission line to the swing angle of the insulator string under the first working condition based on the first sensitivity includes:

[0051] Obtaining a fourth sensitivity of the wind load of the transmission line to the swing angle of the insulator string;

[0052] Based on the first sensitivity, a fifth sensitivity of the tension wind load of the transmission line to the sway angle of the insulator string under the first working condition is obtained.

[0053] Among them, since the calculation methods of the above-mentioned yaw wind load and the above-mentioned tension wind load are different, the influence on the swing angle of the insulator string is also different. For example, the above-mentioned yaw wind load will not affect the conductor stress, but the above-mentioned tension wind load can affect the swing angle of the above-mentioned insulator string by affecting the conductor stress.

[0054] In this implementation, the accuracy of the third sensitivity is improved by respectively acquiring the fourth sensitivity of the yaw wind load to the sway angle of the insulator string and the fifth sensitivity of the tension wind load to the sway angle of the insulator string.

[0055] Optionally, the second parameter information further includes a pole tower vertical coefficient, and when the pole tower vertical coefficient is less than 1, the fourth sensitivity is greater than zero;

[0056] When the tower vertical coefficient is greater than 1, the fourth sensitivity is less than zero.

[0057] In this implementation, the change value of the insulator string sway angle with wind load can be obtained according to the fourth sensitivity, thereby optimizing the design of the overhead transmission line and avoiding flashover caused by a reduction in the electrical spacing between the live parts and the tower components.

[0058] Optionally, the fifth sensitivity is greater than zero.

[0059] In this implementation, the variation of the insulator string sway angle with the tension wind load can be obtained according to the fifth sensitivity, thereby optimizing the design of the overhead transmission line and avoiding flashover caused by a reduction in the electrical spacing between the live parts and the tower components.

[0060] For ease of understanding, the specific examples are as follows:

[0061] The determination of the first sensitivity may include the following process:

[0062] Based on the stress state equation (1): Calculate the conductor stress under different meteorological conditions, let Eq. (1) Formula (1) can be simplified to formula (2): 2 (σ+a)=b;

[0063] Based on the sag formula (3): It can calculate the conductor sag when the stress, specific load and span are known under certain meteorological conditions;

[0064] Among them, σ m and σ represent the horizontal stress at the lowest point of the conductor under known and unknown conditions respectively (unit: N / mm 2 ), γ mand γ represent the conductor load under known and unresolved conditions respectively (unit: N / m·mm 2 ), l represents the conductor spacing, E represents the elastic coefficient of the conductor (unit: N / mm 2 ), α represents the temperature elongation coefficient of the wire (unit: 1 / ℃), F m Represents the known condition coefficient.

[0065] Based on formula (2) or formula (3), the stress σ under certain meteorological conditions can be m With specific load γ m Under the condition (control condition), the conductor stress σ under another meteorological condition (to be determined condition) is calculated, wherein the control condition corresponds to the first condition, and the to be determined condition corresponds to the second condition.

[0066] In order to study the influence of the change of tension wind load on the stress of the conductor, let: F = σ 3 +aσ 2 -b

[0067] According to the implicit function derivation rule, the partial derivative of stress to conductor load can be expressed as:

[0068] in,

[0069] Considering that the change of tension wind load may affect the conductor load under the control condition, it may also affect the conductor load under the condition to be determined, and the analysis can be carried out according to the situation:

[0070] If it is known that the conductor stress σ under non-strong wind control conditions (i.e. annual average temperature control, ice control or low temperature control) m and specific load γ m , calculate the conductor stress σ under strong wind conditions. At this time, the load ratio of non-strong wind conditions is γ m It is not affected by the change of tension wind load, while the load ratio γ of high wind condition will be affected by the change of tension wind load:

[0071] Among them, γ 1 is the conductor deadweight load, γ 4s is the tension-wind load ratio, we can get:

[0072] Therefore, the tension-wind ratio load γ 4s The relative sensitivity of the strong wind stress σ is:

[0073] If the high wind stress σ is known m and specific load γ m , calculate the stress σ of the non-strong wind condition. At this time, the non-strong wind condition load ratio γ is not affected by the change of the tension wind load, while the strong wind condition load ratio γm Will be affected by changes in tension wind loads:

[0074] We can get:

[0075] Therefore, the tension-wind ratio load γ 4s The relative sensitivity of the non-strong wind stress σ is:

[0076]

[0077] If the stress σ under non-strong wind conditions is known m and specific load γ m , calculate the stress σ of the non-strong wind condition. At this time, the non-strong wind condition load ratio γ m The load ratio γ under high wind conditions is not affected by the change of tension wind load, so the conductor stress is not affected by the change of tension wind load.

[0078] If the high wind stress σ is known m and specific load γ m , calculate the stress σ under high wind conditions. At this time, the high wind stress under high wind control is the maximum stress of the conductor, which is a fixed value. Therefore, the conductor stress is not affected by the change of tension wind load.

[0079] Combining the above situations, we can get the tension-wind load γ 4s The relative sensitivity to stress σ is:

[0080]

[0081] in, Stress σ>0, from the above formula (2) we can know that σ+a=b / σ 2 >0, so 0<λ<1.

[0082] Tension wind load γ 4s The relative sensitivity to stress σ is the above-mentioned first sensitivity. Under non-strong wind control conditions, the above-mentioned first sensitivity is greater than zero, and the stress under strong wind conditions will increase monotonically with the tension wind load; under strong wind control conditions, the above-mentioned first sensitivity is less than zero, and the stress under non-strong wind conditions will decrease monotonically with the tension wind load; in other cases, the above-mentioned first sensitivity is equal to zero, and changes in the tension wind load will not affect the conductor stress.

[0083] The determination of the second sensitivity may include the following process:

[0084] According to the analysis of the first sensitivity mentioned above, it can be noted that the influence of the change of tension wind load on the specific load γ and stress σ is different under different control conditions. Since the main concern in engineering design is the sag of the conductor under the highest temperature control condition, the influence of the change of tension wind load on the high temperature sag of the conductor under the high wind control condition is analyzed here. Under the high wind control condition, the specific load γ of the high temperature condition is d Not affected by the change of tension wind load, but the stress σ of high temperature condition is to be determined d Affected by the change of tension wind load and satisfying We can get:

[0085]

[0086] Therefore, under the condition of strong wind control, the conductor high temperature sag f will change with the tension wind load γ 4s Monotonically increasing.

[0087] In addition, under non-strong wind control conditions, since the specific load and stress of the high temperature condition are not affected by the change of the tension wind load, the high temperature sag will not be affected by the change of the tension wind load.

[0088] The determination of the third sensitivity may include the following process:

[0089] Calculate the swing angle of suspension insulator string:

[0090] in, Indicates the swing angle of the insulator string (unit: °), P I Indicates the wind pressure of the insulator string (unit: N), G I represents the gravity of the insulator string (unit: N), P represents the wind load on the conductor (unit: N / m), W I Indicates the self-weight of the conductor (unit: N), l H Indicates the horizontal spacing of the tower for swing angle calculation (unit: m), l v The vertical span of the tower used for calculating the swing angle is expressed in m. Compared with the wind pressure and deadweight of the conductor, the wind pressure and weight of the insulator string are very small, and the influence on the swing angle is small, so it is omitted for the convenience of analysis. Therefore, the wind swing angle of the insulator string can be calculated by the following formula:

[0091] Among them, γ 4s Indicates wind deviation relative to wind load.

[0092] Consider the vertical spacing l of the tower when the maximum sag condition (generally the highest temperature condition) is considered respectively vd Vertical span l when the swing angle is calculated (mainly considering the strong wind condition) v :

[0093] Among them, K v Indicates the tower vertical coefficient, α 0 Represents the tower height difference coefficient, σ d and σ w Respectively represent the horizontal stress at the lowest point of the conductor under the highest temperature and strong wind conditions (unit: N / mm 2 ), so the strong wind sway angle of the insulator string can be expressed as:

[0094]

[0095] Insulator string sway angle and wind load ratioγ 4w , Tower vertical coefficient K v , Conductor gravity load γ 1 and the conductor stress σ d , σ w The vertical coefficient of the tower is K. v and the conductor gravity load γ 1 is a quantity that is independent of wind load, while the conductor stress σ d , σ w Tension wind load γ 4s related.

[0096] Here is the gamma 4w is the wind load ratio used in wind deviation calculation, and is related to the conductor stress σ d , σ w The relevant one is the stress sag calculation using the high wind load γ 4s The calculation methods of the two types of wind loads are different, so the influence of yaw wind load and tension wind load on the swing angle of insulator string needs to be considered separately:

[0097] Since the wind load does not affect the conductor tension, its influence on the swing angle of the insulator string can be directly obtained by sensitivity analysis:

[0098] In actual projects, considering the wind deflection of the suspended tower, the tower vertical coefficient K is usually not set when planning the tower. v is much smaller than 1, so it can be seen that the swing angle of the insulator string usually changes with the wind load ratio γ 4w Monotonically increasing.

[0099] Since the tension wind load affects the swing angle of the insulator string by affecting the conductor stress, the sensitivity of the tension wind load to the swing angle of the insulator string is:

[0100] The first sensitivity is the tension-wind ratio load γ under different control meteorological conditions. 4s The influence on the conductor stress is different, so the tension wind load γ 4sThe sensitivity of the insulator string swing angle also needs to be discussed in different cases:

[0101] If the stress σ under non-strong wind conditions is known m and specific load γ m , conductor stress σ under high temperature conditions d Not affected by the change of strong wind load, but the stress σ under strong wind condition w Affected by the change of strong wind load and satisfying the above formula (3), it can be obtained:

[0102]

[0103] If the high wind stress σ is known m and specific load γ m , conductor stress σ under high temperature conditions d Affected by the change of strong wind load and satisfying formula (3), the stress σ under strong wind condition w Not affected by wind load changes (maximum operating stress of the conductor σ m ), we can get:

[0104]

[0105] When K v <1, the swing angle of the insulator string changes with the tension-wind ratio load γ 4s Monotonically increasing; when K v >1, the swing angle of the insulator string changes with the tension-wind ratio load γ 4s Monotonically decreasing.

[0106] In addition, since 0<λ<1, Available Wind deviation loadγ 4w The effect of the change on the sway angle will be greater than the tension-wind ratio load γ 4s And, with the increase of design wind speed, the wind load γ 4w and tension-wind ratio loadγ 4s All increased, Will follow γ 4w decreases as the value increases, which means that γ 4w The effect of the change on the swing angle will be reduced; Will follow γ 4s increases with the increase of 4s Therefore, when the design wind speed is low, the influence of the change of the tension wind ratio load on the swing angle is smaller than that of the wind yaw wind ratio load; but when the design wind speed is high, the influence of the change of the tension wind ratio load on the swing angle cannot be ignored.

[0107] Taking a section of a ±800kV UHV DC project as an example, the influence of wind load changes on conductor stress sag and insulator swing angle is analyzed. The meteorological conditions of this section of the line are shown in Table 1:

[0108] Table 1

[0109]

[0110] The basic wind speed is the average maximum wind speed at 10m above the ground for 10 minutes in a 100-year period, and the average height of the conductor is 30m. This section of the line uses JL1 / G2A-1250 / 100 conductors, with a calculated cross-section of 1350.03mm 2 , the calculated breaking force is 330290N. The windward area of ​​the insulator swing angle is 2m 2 , the string weight is 2kN. Through the state equation calculation, it can be known that under the typical 500m representative span, the annual average temperature condition is the control condition.

[0111] When the tension-wind ratio load is gradually increased by 20% based on the value specified in the current code, the changes in the gale stress are as follows: Figure 2 As shown. The solid line is the wind stress under different tension-wind load change rates calculated by the state equation, and the two dotted lines are the wind stress change rates calculated by the state equation and the wind stress change rates obtained by the first sensitivity analysis. Figure 2 As shown, the slope of the curve corresponding to the rate of change of high wind stress calculated by the state equation is slightly larger than the slope of the curve corresponding to the rate of change predicted by the above-mentioned first sensitivity analysis, but the two curves are very close, which can indicate that the accuracy of the rate of change predicted by the above-mentioned first sensitivity analysis is higher. At the same time, the high wind stress increases with the increase of the tension-wind load ratio.

[0112] Since the annual average temperature is the control condition, the change of wind load will not affect the high temperature sag, but will affect the insulator swing angle. 4s Wind load ratioγ 4w Based on the current specification, when the synchronous increase is 20%, the change of the insulator swing angle is as follows: Figure 3 As shown (K v =0.8). The solid line is the swing angle at different wind load change rates obtained by the swing angle calculation software, and the two dotted lines are the swing angle change rates calculated by the software and the swing angle change rates obtained according to the third sensitivity analysis. Figure 3 As shown, the slope of the curve corresponding to the swing angle change rate calculated by the software is slightly smaller than the slope of the curve corresponding to the change rate predicted by the above second sensitivity analysis, but the two curves are very close, which can indicate that the change rate predicted by the above third sensitivity analysis has a higher accuracy.

[0113] The following further analyzes the contribution of tension load and wind load to the change of sway angle. v = 0.7, 0.8, 1.1, when the tension wind load and wind load increase to 20% respectively, the change results of the insulator swing angle are as follows Figure 4 As shown, the solid line shows the change of the swing angle with the wind load, and the dotted line shows the change of the swing angle with the tension load. Figure 4 As shown in Figure 2, the swing angle of the insulator string increases monotonically with the wind load and the tension load (K v <1) or decreasing (K v >1). At the same time, the effect of wind load change on the sway angle is greater than that of wind load change on the tension load.

[0114] If the design basic wind speed is increased from the original 31m / s to 42m / s, it can be calculated through the state equation that under the typical 500m representative span, strong wind is the control condition. At this time, the high temperature stress and sag change with the tension-wind ratio load as shown in the following figure: Figure 5 As shown in the figure, the solid line represents the change of high temperature stress, and the dotted line represents the change of high temperature sag. Figure 5 As shown, with the increase of tension wind load, high temperature stress decreases and high temperature sag increases, which corresponds to the analysis of the second sensitivity mentioned above.

[0115] Further analysis of the contribution of tension load and wind load to the change of sway angle shows that Figure 6 As shown. Figure 6 As shown in Figure 2, the monotonic law of the swing angle changing with the two wind loads is consistent with Figure 4 The same, but because the design wind speed is increased from 31m / s to 42m / s, the influence of wind load change on the sway angle is reduced, while the influence of tension load change is increased, which corresponds to the analysis of the third sensitivity mentioned above.

[0116] See also Figure 7 , Figure 7 is a schematic diagram of the structure of a conductor parameter acquisition device provided in an embodiment of the present application, such as Figure 7 As shown, including:

[0117] A first acquisition unit 701 is used to acquire first parameter information of the transmission line, second parameter information under a first working condition, and a first sensitivity of the wind load of the transmission line to stress under the first working condition and a second sensitivity of the wind load of the transmission line to sag under the first working condition, wherein the first parameter information includes a span, an elastic modulus, and a temperature elongation coefficient of the transmission line, and the second parameter information includes stress, sag, and a swing angle of an insulator string of the transmission line under the first working condition;

[0118] A second acquisition unit 702 is used to acquire a third sensitivity of the wind load of the transmission line to the swing angle of the insulator string under the first working condition based on the first sensitivity;

[0119] The third acquisition unit 703 is used to acquire third parameter information under a second operating condition based on the first sensitivity, the second sensitivity, the third sensitivity, the first parameter information and the second parameter information, wherein the third parameter information includes the stress, sag and insulator string swing angle of the transmission line under the second operating condition.

[0120] Optionally, when the first operating condition is a non-strong wind operating condition and the second operating condition is a strong wind operating condition, the first sensitivity is greater than zero;

[0121] When the first operating condition is a strong wind condition and the second operating condition is a non-strong wind condition, the first sensitivity is less than zero.

[0122] Optionally, when the first operating condition is a high wind condition and the second operating condition is a high temperature condition, the second sensitivity is greater than zero.

[0123] Optionally, the third sensitivity includes a fourth sensitivity of the wind load of the transmission line to the swing angle of the insulator string and a fifth sensitivity of the tension wind load of the transmission line to the swing angle of the insulator string;

[0124] The step of obtaining the third sensitivity of the wind load of the transmission line to the swing angle of the insulator string under the first working condition based on the first sensitivity includes:

[0125] Obtaining a fourth sensitivity of the wind load of the transmission line to the swing angle of the insulator string;

[0126] Based on the first sensitivity, a fifth sensitivity of the tension wind load of the transmission line to the sway angle of the insulator string under the first working condition is obtained.

[0127] Optionally, the second parameter information further includes a pole tower vertical coefficient, and when the pole tower vertical coefficient is less than 1, the fourth sensitivity is greater than zero;

[0128] When the tower vertical coefficient is greater than 1, the fourth sensitivity is less than zero.

[0129] Optionally, the fifth sensitivity is greater than zero.

[0130] The wire parameter acquisition device 700 can realize the embodiment of the present application Figure 1 The various processes of the method embodiment and the same beneficial effects are achieved, and will not be described again here to avoid repetition.

[0131] See also Figure 8The embodiment of the present application also provides an electronic device, the electronic device 800 includes a processor 801, a memory 802, a program or instruction stored in the memory 802 and executable on the processor 801, and the program or instruction is executed by the processor 801 to implement the embodiment of the present application Figure 1 The various processes of the method embodiments can achieve the same technical effect, and will not be described again here to avoid repetition.

[0132] The present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the present application is implemented. Figure 1 The various processes of the method embodiments can achieve the same technical effect, and will not be described again here to avoid repetition.

[0133] The processor is the processor in the electronic device in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0134] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0135] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods of each embodiment of the present application.

[0136] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A method for obtaining conductor parameters, characterized in that: include: Acquire first parameter information of the transmission line, second parameter information under a first working condition, and a first sensitivity of the wind load of the transmission line to stress under the first working condition and a second sensitivity of the wind load of the transmission line to sag under the first working condition, wherein the first parameter information includes the span, elastic modulus and temperature elongation coefficient of the transmission line, and the second parameter information includes the stress, sag and insulator string swing angle of the transmission line corresponding to the first wind load; Based on the first sensitivity, obtaining a third sensitivity of the wind load of the transmission line to the swing angle of the insulator string under the first working condition; Based on the first sensitivity, the second sensitivity, the third sensitivity, the first parameter information and the second parameter information, obtaining third parameter information under a second working condition, wherein the third parameter information includes stress, sag and insulator string swing angle of the transmission line corresponding to the second wind load; The first sensitivity is determined by the following formula: In the formula, γ 4s is the tension-wind load, σ is the stress, For γ 4s The first sensitivity to σ, σ m is the horizontal stress at the lowest point of the conductor under known conditions, σ is the horizontal stress at the lowest point of the conductor under the condition to be determined, γ m is the conductor load under known conditions, γ is the conductor load under unknown conditions, l is the conductor spacing, E is the elastic coefficient of the conductor, α is the temperature elongation coefficient of the conductor, and F m Indicates known condition coefficient, stress σ>0, 0<λ<1; The second sensitivity is confirmed by the following formula: is the second sensitivity, σ d is the stress at the lowest horizontal point of the high temperature condition to be determined, γ d is the specific load of high temperature working condition, f is the sag; The third sensitivity is determined by the following formula: For the third sensitivity, is the swing angle of the insulator string, P is the wind load on the conductor, l H The horizontal spacing of the tower used for swing angle calculation, W I is the self-weight of the wire, l v is the vertical spacing of the tower used for swing angle calculation, γ 4w is the wind load, K v is the tower vertical coefficient, γ1 is the conductor gravity load, σ w It is the horizontal stress at the lowest point of the conductor under strong wind conditions.

2. The method according to claim 1, characterized in that When the first working condition is a non-strong wind working condition and the second working condition is a strong wind working condition, the first sensitivity is greater than zero; When the first operating condition is a strong wind condition and the second operating condition is a non-strong wind condition, the first sensitivity is less than zero.

3. The method according to claim 1, characterized in that When the first operating condition is a strong wind condition and the second operating condition is a high temperature condition, the second sensitivity is greater than zero.

4. The method according to claim 1, characterized in that The third sensitivity includes a fourth sensitivity of the wind load of the transmission line to the swing angle of the insulator string and a fifth sensitivity of the tension wind load of the transmission line to the swing angle of the insulator string; The step of obtaining the third sensitivity of the wind load of the transmission line to the swing angle of the insulator string under the first working condition based on the first sensitivity includes: Obtaining a fourth sensitivity of the wind load of the transmission line to the swing angle of the insulator string; Based on the first sensitivity, a fifth sensitivity of the tension wind load of the transmission line to the sway angle of the insulator string under the first working condition is obtained.

5. The method according to claim 4, characterized in that The second parameter information further includes a pole tower vertical coefficient. When the pole tower vertical coefficient is less than 1, the fourth sensitivity is greater than zero; When the tower vertical coefficient is greater than 1, the fourth sensitivity is less than zero.

6. The method according to claim 5, characterized in that The fifth sensitivity is greater than zero.

7. A conductor parameter acquisition device, characterized in that: include: A first acquisition unit is used to acquire first parameter information of the transmission line, second parameter information under a first working condition, and a first sensitivity of the wind load of the transmission line to stress under the first working condition and a second sensitivity of the wind load of the transmission line to sag under the first working condition, wherein the first parameter information includes the span, elastic modulus and temperature elongation coefficient of the transmission line, and the second parameter information includes the stress, sag and insulator string swing angle of the transmission line corresponding to the first wind load; A second acquisition unit, configured to acquire, based on the first sensitivity, a third sensitivity of the wind load of the transmission line to the swing angle of the insulator string under the first working condition; a third acquisition unit, configured to acquire third parameter information under a second working condition based on the first sensitivity, the second sensitivity, the third sensitivity, the first parameter information, and the second parameter information, wherein the third parameter information includes stress, sag, and insulator string sway angle of the transmission line corresponding to a second wind load; The first sensitivity is determined by the following formula: In the formula, γ 4s is the tension-wind load, σ is the stress, For γ 4s The first sensitivity to σ, σ m is the horizontal stress at the lowest point of the conductor under known conditions, σ is the horizontal stress at the lowest point of the conductor under the condition to be determined, γ m is the conductor load under known conditions, γ is the conductor load under unknown conditions, l is the conductor spacing, E is the elastic coefficient of the conductor, α is the temperature elongation coefficient of the conductor, and F m Indicates known condition coefficient, stress σ>0, 0<λ<1; The second sensitivity is confirmed by the following formula: is the second sensitivity, σ d is the stress at the lowest horizontal point of the high temperature condition to be determined, γ d is the specific load of high temperature working condition, f is the sag; The third sensitivity is determined by the following formula: For the third sensitivity, is the swing angle of the insulator string, P is the wind load on the conductor, l H The horizontal span of the tower used for swing angle calculation, W I is the self-weight of the wire, l v is the vertical spacing of the tower used for swing angle calculation, γ 4w is the wind load, K v is the tower vertical coefficient, γ1 is the conductor gravity load, σ w It is the horizontal stress at the lowest point of the conductor under strong wind conditions.

8. An electronic device, characterized in that: The method comprises a processor, a memory, and a program or instruction stored in the memory and running on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the wire parameter acquisition method as described in any one of claims 1 to 6.

9. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by a processor, the steps of the wire parameter acquisition method according to any one of claims 1 to 6 are implemented.

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