Method and system for judging hanging direction of insulator in string of strain insulator, and device

Abstract

The application discloses a kind of insulator hanging direction judgment method and system in strain insulator string, equipment, it is related to power transmission engineering technical field, it includes according to line parameter data to judge the control operating condition of overhead line;Calculate the hanging point tension of considering string weight under corresponding control operating condition;The hanging point tension of considering string weight is judged, if hanging point tension does not comply with preset requirement, then relax the safety factor of overhead line, until hanging point tension complies with preset requirement, then calculate the inclination angle of midpoint of strain insulator string considering string weight under average temperature operating condition;The hanging direction of insulator is judged according to the inclination angle of midpoint of strain insulator string considering string weight under average temperature operating condition.The application can consider the influence of strain string unit load on sag and tension, calculate the tension of overhead line under non-uniform load, and judge the hanging direction of insulator in strain insulator string, to achieve more accurate calculation, ensure the accuracy and safety of design.

Description

Technical Field

[0001] This invention relates to a method, system, and equipment for determining the suspension direction of insulators in a tension insulator string, belonging to the technical field of power transmission engineering design. Background Technology

[0002] In mountainous areas, due to significant terrain undulations, the tension insulator strings on some towers may frequently rise upwards. If these insulator strings are still suspended in the normal manner, their porcelain skirts will face upwards, making it easy for rain, snow, and dirt to accumulate in the skirt grooves, thereby reducing the insulation strength. Therefore, it is advisable to hang the rising insulator strings upside down.

[0003] A common method is to determine whether inverted hanging is needed by checking the vertical distance. When the vertical distance at the maximum sag on a certain side is less than the calculated vertical distance... When this occurs, the tension insulator string on that side needs to be inverted. The formula for calculating the vertical span at the maximum sag on a certain side is:

[0004] ;

[0005] in, This represents the weight of a single-phase tension insulator string, in N; This represents the unit load per unit temperature of the conductor, in N / m. This represents the unit load at maximum sag of the sub-conductor, in N / m. The tension of the conductor at the average temperature is expressed in N. N represents the tension at maximum sag of the sub-conductor; n represents the number of split conductors in the phase conductor; H represents the height difference on that side, positive when the adjacent tower is lower and negative otherwise.

[0006] The formula for calculating the vertical span above does not consider the influence of the tension string weight on sag and tension. It considers the sag and tension of the overhead line under uniformly distributed load. However, the mechanical properties of the tension string and the conductor are obviously different, and it should be a non-uniformly distributed load. Therefore, the above judgment method is not rigorous.

[0007] Therefore, a more rigorous and accurate method for determining the suspension direction of insulators is needed. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method, system, and device for determining the suspension direction of insulators in a tension insulator string. This method can consider the influence of the unit load of the tension string on sag and tension, calculate the tension of the overhead line under non-uniformly distributed load, and thereby determine the suspension direction of the insulator in the tension insulator string, achieving more accurate calculation and ensuring the accuracy and safety of the design.

[0009] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0010] In a first aspect, the present invention provides a method for determining the suspension direction of an insulator in a tension insulator string, comprising:

[0011] S1. Obtain line parameter data;

[0012] S2. Determine the control status of the overhead line based on the line parameter data;

[0013] S3. Based on the theory of simply supported beams, calculate the tension at the suspension point considering the tandem load under the corresponding control conditions.

[0014] S4. Compare the suspension point tension considering the tandem load with the preset requirements. If the suspension point tension does not meet the preset requirements, relax the safety factor of the overhead line and recalculate the suspension point tension considering the tandem load under the corresponding control conditions.

[0015] S5. Repeat S4 until the tension at the suspension point meets the preset requirements. Then, based on the simple supported beam theory, calculate the tilt angle of the midpoint of the tension insulator string considering the string weight under the average temperature condition.

[0016] S6. Determine the suspension direction of the insulator based on the inclination angle of the midpoint of the tension insulator string considering the string weight under average temperature conditions.

[0017] Furthermore, the line parameter data includes overhead line data, line data, and temperature under various control conditions. The overhead line data includes the temperature expansion coefficient, elastic coefficient, test breaking force, safety factor, service stress, and specific load of the overhead line. The line data includes span, suspension point height, length of tension insulator string, and unit load of tension insulator string. The control conditions include minimum temperature, average temperature, maximum wind speed, and icing.

[0018] Furthermore, the control conditions of the overhead line are determined based on the line parameter data by judging the effective critical span, which is calculated from the critical span under any two conditions.

[0019] Furthermore, the calculation expression for the critical distance under any two working conditions is as follows:

[0020] ;

[0021] in, Indicates the critical gear spacing. This represents the elasticity coefficient of the overhead power line. This represents the coefficient of thermal expansion of an overhead power line. Indicates control conditions Allowable operating stress, Indicates control conditions Allowable operating stress, Indicates control conditions The temperature below, Indicates control conditions The temperature below, Indicates control conditions The load ratio of the overhead line below Indicates control conditions The load on the overhead line.

[0022] Furthermore, the calculation expression for the suspension point tension considering the tandem load under the corresponding control condition is as follows:

[0023] ;

[0024] ;

[0025] in, This represents the slope at a point on the overhead power line. This indicates the angle of inclination at a point on the overhead line. Indicates the tension at the suspension point. Indicates the elevation difference angle. Indicates the horizontal tension of the overhead line. This indicates the shear force at a point on the overhead line caused by the load within the span, equivalent to the support shear force on a simply supported beam. This represents the test breaking force of the overhead line, and k represents the safety factor of the overhead line.

[0026] Furthermore, the preset requirement is that the axial tension of the overhead line at the suspension point is not greater than 1.1 times the horizontal tension of the overhead line.

[0027] Furthermore, the calculation expression for the inclination angle of the midpoint of the tension insulator string considering the string weight under the average temperature condition is as follows:

[0028] ;

[0029] ;

[0030] ;

[0031] in, This indicates the support shear force at suspension point A caused by the load within the span, equivalent to that on a simply supported beam. Indicates the gear distance. This represents the unit load of the tension insulator string at suspension point A. This indicates the length of the tension insulator string at suspension point A. This indicates the unit load of the overhead line. Indicates the length of the overhead line. This indicates the unit load of the tension insulator string at suspension point B. This indicates the length of the tension insulator string at suspension point B. Indicates the elevation difference angle. This represents the slope at the midpoint of the tension insulator string at suspension point A. This represents the slope at the midpoint of the tension insulator string at suspension point B. This indicates the support shear force, equivalent to that on a simply supported beam, caused by the load within the span at the midpoint of the tension insulator string at suspension point A. This indicates the shear force at the midpoint of the tension insulator string at suspension point B, equivalent to that on a simply supported beam. Indicates the horizontal tension of the overhead power line;

[0032] If there is no tension insulator string at either suspension point A or suspension point B, then the length and unit load of the tension insulator string at the corresponding suspension point are both taken as 0.

[0033] Furthermore, determining the suspension direction of the insulator based on the inclination angle of the midpoint of the tension insulator string considering the string weight under average temperature conditions includes:

[0034] If the slope of the midpoint of the tension insulator string at the suspension point is less than 0, then the insulators in the tension insulator string need to be inverted; otherwise, inversion is not required.

[0035] In a second aspect, the present invention also provides a system for determining the suspension direction of an insulator in a tension insulator string, used to implement the method for determining the suspension direction of an insulator in a tension insulator string as described in any one of the first aspects, comprising:

[0036] The line parameter data acquisition module is configured to acquire line parameter data;

[0037] The control condition judgment module is configured to determine the control condition of the overhead line based on line parameter data.

[0038] The tension calculation module is configured to calculate the suspension point tension considering tandem weight under the corresponding control conditions based on the simply supported beam theory.

[0039] The tension relaxation judgment module is configured to judge the tension of the suspension point considering the tandem weight. If the tension of the suspension point does not meet the preset requirements, it will be relaxed and the tension of the suspension point considering the tandem weight under the corresponding control condition will be recalculated.

[0040] The tilt angle calculation module is configured to calculate the tilt angle of the midpoint of the tension insulator string considering the string weight under the average temperature condition, based on the simply supported beam theory, when the tension at the suspension point meets the preset requirements.

[0041] The insulator suspension direction determination module is configured to determine the suspension direction of the insulator based on the tilt angle of the midpoint of the tension insulator string considering the string weight under average temperature conditions.

[0042] Thirdly, the present invention also provides a computer device, comprising:

[0043] Memory, used to store computer programs;

[0044] A processor for executing the computer program to implement the method for determining the suspension direction of an insulator in a tension insulator string as described in any of the first aspects.

[0045] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0046] The method for determining the suspension direction of insulators in a tension insulator string provided by this invention can take into account the influence of the unit load of the tension insulator string on sag and tension. It calculates the tension of the overhead line under non-uniformly distributed load and thereby determines the suspension direction of the insulator in the tension insulator string, achieving more accurate calculation and ensuring the accuracy and safety of the insulator string design. Attached Figure Description

[0047] Figure 1 This is a flowchart illustrating a method for determining the suspension direction of an insulator in a tension insulator string, according to one embodiment of the present invention. Detailed Implementation

[0048] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0049] Example 1:

[0050] like Figure 1 As shown in the figure, this embodiment of the invention provides a method for determining the suspension direction of an insulator in a tension insulator string, specifically including the following steps:

[0051] S1. Obtain line parameter data. In this embodiment, the line parameter data includes overhead line data, line data, and air temperature under various control conditions. The overhead line data includes the temperature expansion coefficient, elastic coefficient, test breaking force, safety factor, service stress, and specific load of the overhead line. The line data includes span, suspension point height, tension insulator string length, and unit load of the tension insulator string. There are four control conditions: minimum air temperature, average air temperature, maximum wind speed, and icing.

[0052] S2. Determine the control conditions of the overhead line based on the line parameter data. Specifically, the effective critical span is determined by the effective critical span, which is calculated from the critical span under any two control conditions.

[0053] The calculation expression for the critical gear distance under any two control conditions is as follows:

[0054] ;

[0055] in, This indicates the critical span, in meters. This represents the elastic modulus of an overhead power line, expressed in N / mm². 2 , This represents the coefficient of thermal expansion of an overhead power line, expressed in units of 1 / ℃. Indicates control conditions Allowable operating stress, Indicates control conditions The allowable operating stress is expressed in N / mm². 2 , Indicates control conditions The temperature below, Indicates control conditions The air temperature is below, and the unit of air temperature is °C. Indicates control conditions The load ratio of the overhead line below Indicates control conditions The specific load of the overhead line is expressed in N / (m*mm). 2 ).

[0056] The selection of the effective critical gap and the judgment of the control conditions are well known to professionals in this field, and will not be elaborated here.

[0057] S3. Based on the simply supported beam theory, calculate the suspension point tension considering the tandem load under the corresponding control condition. The calculation expression is as follows:

[0058] ;

[0059] ;

[0060] in, This represents the slope at a point on the overhead power line. This indicates the angle of inclination at a point on the overhead line. Indicates the tension at the suspension point. This represents the elevation difference angle, which is calculated from the height of the hanging point; details will not be elaborated upon here. Indicates the horizontal tension of the overhead line. This indicates the shear force at a point on the overhead line caused by the load within the span, equivalent to the support shear force on a simply supported beam. This represents the test breaking force of the overhead line, and k represents the safety factor of the overhead line.

[0061] S4. Compare the suspension point tension considering tandem load with the preset requirements. According to the requirements, the design safety factor of the overhead line at the lowest point of sag should not be less than 2.5, and the design safety factor of the suspension point should not be less than 2.25. Therefore, in this embodiment, the preset requirement is set to the axial tension of the overhead line at the suspension point not exceeding 1.1 times the horizontal tension of the overhead line. If the suspension point tension does not meet the preset requirements, the safety factor of the overhead line is relaxed, and the suspension point tension considering tandem load under the corresponding control condition is recalculated.

[0062] S5. Repeat S4 until the tension at the suspension point meets the preset requirements. Then, based on the simply supported beam theory, calculate the inclination angle of the midpoint of the tension insulator string considering the string weight under the average temperature condition. The calculation expression is as follows:

[0063] ;

[0064] ;

[0065] ;

[0066] in, This indicates the support shear force at suspension point A caused by the load within the span, equivalent to that on a simply supported beam. Indicates the gear distance. This represents the unit load of the tension insulator string at suspension point A. This indicates the length of the tension insulator string at suspension point A. This indicates the unit load of the overhead line. Indicates the length of the overhead line. This indicates the unit load of the tension insulator string at suspension point B. This indicates the length of the tension insulator string at suspension point B. Indicates the elevation difference angle. This represents the slope at the midpoint of the tension insulator string at suspension point A. This represents the slope at the midpoint of the tension insulator string at suspension point B. This indicates the support shear force, equivalent to that on a simply supported beam, caused by the load within the span at the midpoint of the tension insulator string at suspension point A. This indicates the shear force at the midpoint of the tension insulator string at suspension point B, equivalent to that on a simply supported beam. Indicates the horizontal tension of the overhead power line;

[0067] It should be noted that the basis of this embodiment is that at least one of the two suspension points A and B has a tension insulator string. If one of the suspension points A and B does not have a tension insulator string, then the length and unit load of the tension insulator string at the corresponding suspension point are both taken as 0.

[0068] S6, if the slope at the midpoint of the suspension point tension insulator string ( , If the value is less than 0, then the insulators in the tension insulator string need to be inverted; otherwise, they do not need to be inverted.

[0069] Example 2:

[0070] This embodiment also provides a system for determining the suspension direction of insulators in a tension insulator string, used to implement the method for determining the suspension direction of insulators in a tension insulator string as described in Embodiment 1, which includes:

[0071] The line parameter data acquisition module is configured to acquire line parameter data;

[0072] The control condition judgment module is configured to determine the control condition of the overhead line based on line parameter data.

[0073] The tension calculation module is configured to calculate the suspension point tension considering tandem weight under the corresponding control conditions based on the simply supported beam theory.

[0074] The tension relaxation judgment module is configured to judge the tension of the suspension point considering the load. If the tension of the suspension point does not meet the preset requirements, the safety factor of the overhead line is relaxed and the tension of the suspension point considering the load under the corresponding control condition is recalculated.

[0075] The tilt angle calculation module is configured to calculate the tilt angle of the midpoint of the tension insulator string considering the string weight under the average temperature condition, based on the simply supported beam theory, when the tension at the suspension point meets the preset requirements.

[0076] The insulator suspension direction determination module is configured to determine the suspension direction of the insulator based on the tilt angle of the midpoint of the tension insulator string considering the string weight under average temperature conditions.

[0077] Example 3:

[0078] This embodiment also provides a computer device, including:

[0079] Memory, used to store computer programs;

[0080] A processor is used to execute the computer program to implement the insulator suspension direction determination method in a tension insulator string as described in Embodiment 1.

[0081] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for determining the suspension direction of an insulator in a tension insulator string, characterized in that, include: S1. Obtain line parameter data; S2. Determine the control status of the overhead line based on the line parameter data; S3. Based on the theory of simply supported beams, calculate the tension at the suspension point considering the tandem load under the corresponding control conditions. S4. Compare the suspension point tension considering the tandem load with the preset requirements. If the suspension point tension does not meet the preset requirements, relax the safety factor of the overhead line and recalculate the suspension point tension considering the tandem load under the corresponding control conditions. S5. Repeat S4 until the tension at the suspension point meets the preset requirements. Then, based on the simple supported beam theory, calculate the tilt angle of the midpoint of the tension insulator string considering the string weight under the average temperature condition. S6. Determine the suspension direction of the insulator based on the inclination angle of the midpoint of the tension insulator string considering the string weight under average temperature conditions.

2. The method for determining the suspension direction of an insulator in a tension insulator string according to claim 1, characterized in that, The line parameter data includes overhead line data, line data, and temperature under various control conditions. The overhead line data includes the temperature expansion coefficient, elastic coefficient, test breaking force, safety factor, service stress, and specific load of the overhead line. The line data includes span, suspension point height, tension insulator string length, and unit load of the tension insulator string. The control conditions include minimum temperature, average temperature, maximum wind speed, and icing.

3. The method for determining the suspension direction of an insulator in a tension insulator string according to claim 1, characterized in that, The control conditions of the overhead line are determined based on the line parameter data by judging the effective critical span, which is calculated from the critical span under any two conditions.

4. The method for determining the suspension direction of an insulator in a tension insulator string according to claim 3, characterized in that, The calculation expression for the critical span under any two working conditions is as follows: ； in, Indicates the critical gear spacing. This represents the elasticity coefficient of the overhead power line. This represents the coefficient of thermal expansion of an overhead power line. Indicates control conditions Allowable operating stress, Indicates control conditions Allowable operating stress, Indicates control conditions The temperature below, Indicates control conditions The temperature below, Indicates control conditions The load ratio of the overhead line below Indicates control conditions The load on the overhead line.

5. The method for determining the suspension direction of an insulator in a tension insulator string according to claim 1, characterized in that, The calculation expression for the suspension point tension considering the tandem load under the corresponding control condition is as follows: ； ； in, This represents the slope at a point on the overhead line. This indicates the angle of inclination at a point on the overhead line. Indicates the tension at the suspension point. Indicates the elevation difference angle. Indicates the horizontal tension of the overhead line. This indicates the shear force at a point on the overhead line caused by the load within the span, equivalent to the support shear force on a simply supported beam. This represents the test breaking force of the overhead line, and k represents the safety factor of the overhead line.

6. The method for determining the suspension direction of an insulator in a tension insulator string according to claim 1, characterized in that, The preset requirement is that the axial tension of the overhead line at the suspension point is not greater than 1.1 times the horizontal tension of the overhead line.

7. The method for determining the suspension direction of an insulator in a tension insulator string according to claim 1, characterized in that, The formula for calculating the inclination angle of the midpoint of the tension insulator string considering the string weight under the average temperature condition is as follows: ； ； ； in, This indicates the support shear force at suspension point A caused by the load within the span, equivalent to that on a simply supported beam. Indicates the gear distance. This represents the unit load of the tension insulator string at suspension point A. This indicates the length of the tension insulator string at suspension point A. This indicates the unit load of the overhead line. Indicates the length of the overhead line. This indicates the unit load of the tension insulator string at suspension point B. This indicates the length of the tension insulator string at suspension point B. Indicates the elevation difference angle. This represents the slope at the midpoint of the tension insulator string at suspension point A. This represents the slope at the midpoint of the tension insulator string at suspension point B. This indicates the support shear force, equivalent to that on a simply supported beam, caused by the load within the span at the midpoint of the tension insulator string at suspension point A. This indicates the shear force at the midpoint of the tension insulator string at suspension point B, equivalent to that on a simply supported beam. Indicates the horizontal tension of the overhead power line; If there is no tension insulator string at either suspension point A or suspension point B, then the length and unit load of the tension insulator string at the corresponding suspension point are both taken as 0.

8. The method for determining the suspension direction of an insulator in a tension insulator string according to claim 1, characterized in that, The method of determining the suspension direction of an insulator based on the inclination angle of the midpoint of the tension insulator string considering the string weight under average temperature conditions includes: If the slope of the midpoint of the tension insulator string at the suspension point is less than 0, then the insulators in the tension insulator string need to be inverted; otherwise, inversion is not required.

9. A system for determining the suspension direction of an insulator in a tension insulator string, characterized in that, The method for determining the suspension direction of an insulator in a tension insulator string as described in any one of claims 1 to 8 includes: The line parameter data acquisition module is configured to acquire line parameter data; The control condition judgment module is configured to determine the control condition of the overhead line based on line parameter data. The tension calculation module is configured to calculate the suspension point tension considering tandem weight under the corresponding control conditions based on the simply supported beam theory. The tension relaxation judgment module is configured to judge the tension of the suspension point considering the tandem load. If the tension of the suspension point does not meet the preset requirements, the safety factor of the overhead line is relaxed and the tension of the suspension point considering the tandem load under the corresponding control conditions is recalculated. The tilt angle calculation module is configured to calculate the tilt angle of the midpoint of the tension insulator string considering the string weight under the average temperature condition, based on the simply supported beam theory, when the tension at the suspension point meets the preset requirements. The insulator suspension direction determination module is configured to determine the suspension direction of the insulator based on the tilt angle of the midpoint of the tension insulator string considering the string weight under average temperature conditions.

10. A computer device, characterized in that, include: Memory, used to store computer programs; A processor is configured to execute the computer program to implement the method for determining the suspension direction of an insulator in a tension insulator string as described in any one of claims 1 to 8.

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