Method for leveling balance stress of double-hanging-point independent double-string type suspension fitting string

Abstract

The invention discloses a method for leveling the balance stress of a double-hanging-point independent double-string type suspension fitting string. The method comprises the following steps: S1, creating an independent double-hanging-string type balance stress model; s2, stress parameters are calculated; S3, an independent double-hanging string type balance stress leveling calculation equation is formed; s4, the string type stress values under various working conditions are judged through stress analysis; S5, the leveling value of the difference value delta of the front-side independent string type and the rear-side independent string type is calculated according to different stress conditions; according to the scheme, the stress analysis model can be established according to the situation that the independent double-hanging-point string type in the large-fluctuation mountainous area section cannot achieve stress balance, and detailed numerical values of all parameters needed in the stress balance state are obtained by analyzing the stress balance equation. According to the calculated parameters, stress leveling can be effectively carried out on the whole string type, and the problem that each independent branch string does not reach the planned stress is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of calculation method of force balance of power transmission line hardware string type, in particular to a method for balancing force of independent double-hanging point double-string type suspension hardware string. BACKGROUND

[0002] In the field of power transmission line design, the design and arrangement of conductor hardware string type plays a key role, especially with the improvement of reliability and applicability of power transmission line, the diversity and reliability of conductor hardware string type have become an important research direction in the field of power transmission line design.

[0003] The independent double-hanging conductor string type is composed of two independent I-shaped suspension strings, and the hanging points and line clamps are independently formed into strings, and the forces are not connected during the period. Since the string is composed of two independent branches, in the extreme case when one of the string types is disconnected, the other branch string type can be used for power transmission line, ensuring that the conductor will not fall to the ground or trip in extreme conditions, providing strong conditions for power transmission line repair and continuous power supply. Therefore, this string type is widely used in important crossing sections of power transmission line, providing effective measures for normal operation and power supply guarantee under extreme conditions of power transmission line.

[0004] However, this string type also has disadvantages, such as the inconsistency of the height difference on both sides of the straight tower in the large relief mountain area, which leads to inconsistent forces before and after the string type. Therefore, in this condition, the tension of the two independent branches is inconsistent, causing tension difference between the two branches. Therefore, in the large relief mountain area, the length of the two independent branches should be adjusted to balance the force.

[0005] The present application is based on the force balance, and the overall string type force model and the parameters of each single string are established, and the key parameters of force balance are calculated by establishing the overall force balance equation. SUMMARY

[0006] The purpose of the present application is to establish a force analysis model for the case that the independent double-hanging point string type in the large relief mountain area cannot achieve force balance, and to obtain the detailed values of each parameter required in the force balance state by solving the force balance equation. According to the calculated parameters, the force of the overall string type can be effectively adjusted, and the problem of not achieving the planned force of each independent branch string can be solved.

[0007] The present application is realized by the following scheme: A method for balancing force of independent double-hanging point double-string type suspension hardware string, comprising the following steps: Comprising the following steps: Step S1: creating an independent double-hanging string type force balance model; Step S2: Calculate the force parameters: Step S3: Form the independent double hanging string type balance force leveling calculation equation; Step S4: Determine the string force values under various working conditions through force analysis: Step S5: Calculate the front and rear side independent string type difference Δ leveling value according to different force conditions.

[0008] In step S1: Specifically, the unequal length combination method is used to simulate and solve the force balance of two single-sided branch strings, and the whole string force balance conditions are sequentially modeled.

[0009] In step S2: The front and rear side suspension angle values, the length difference of the two single-sided branch strings, and the tension values of the front and rear sides of the conductor are analyzed to form an independent double hanging string type balance force leveling calculation model.

[0010] In step S3: Specifically, when the forces of the two branch strings are equal, or one of the front and rear branch strings is not under force, the respective force balance equations are formed.

[0011] In step S4: Specifically, the force balance equations are calculated and decomposed to determine the string force values under various working conditions.

[0012] In step S2, analyze the force and load of each independent limb to form a force balance formula.

[0013] In step S2, specifically, the applicable conditions of the independent double hanging string type at the front and rear sides of the use position are initially determined: the wire horizontal tension T0, the front side suspension angle α and the rear side suspension angle β are calculated, the front and rear side insulator string hanging point spacing 2e and the front and rear side hardware string hanging point height difference angle θ are determined.

[0014] The formed force balance formula is: Tα=T0*TAN(α)-T0*TAN(θ) Tβ=T0*TAN(θ)-T0*TAN(β) TAN(θ)=Δ / (2e) Where Tα represents the horizontal force of one side single limb string, Tβ represents the horizontal force of the other side single limb string, T0 represents the wire horizontal tension, α represents the suspension angle of one side single limb string, β represents the suspension angle of the other side single limb string, 2e represents the horizontal spacing of the two side single limb insulator string hanging points, and θ represents the height difference angle of the two side single limb insulator hardware string clamp hanging points.

[0015] In step S4, the independent double hanging string type fixed matching conditions are determined using the tower suspension string type hanging points, and the range limits of each parameter value under the condition of force change are calculated by changing the known parameters; specifically, the force analysis is used to determine: When TAN (θ) = (TAN (α) + TAN (β) / 2, the independent double hanging string type is balanced, and the overall string type has no tension difference on the front and rear sides; When Tβ = T0 * TAN (θ) - T0 * TAN (β) = 0, the rear independent string is not stressed, and the overall string type is stressed on the front independent string type; When Tα = T0 * TAN (α) - T0 * TAN (θ) = 0, the front independent string is not stressed, and the overall string type is stressed on the rear independent string type.

[0016] In step S5, the front and rear independent string type difference Δ is respectively: The front and rear side stress balance has no tension difference: Δ = e (TAN (α) + TAN (β)); The rear independent string is not stressed: Δ = 2eTAN (β); The front independent string is not stressed: Δ = 2eTAN (α).

[0017] As described above, due to the adoption of the above technical scheme, the beneficial effects of the present application are: 1. At present, the independent double hanging string type is widely used in power transmission lines, but there is no clear calculation method and formula for configuring the string type when the stress is unbalanced in the mountain area. According to the stress model of the power transmission line, the stress formula of the string type is analyzed, and an effective configuration solution is proposed.

[0018] 2. The scheme can form a stress analysis model for the case that the independent double hanging point string type in the large relief mountainous section cannot achieve stress balance, and the detailed values of each parameter required in the stress balance state are obtained by analyzing the stress balance equation. According to the calculated parameters, the stress of the overall string type can be effectively leveled, and the problem that the independent branch string does not reach the planned stress is solved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 is the stress analysis model of the independent double hanging string type in the present application; Fig. 2 is the flowchart of the present application. DETAILED DESCRIPTION

[0020] All features disclosed in this specification, and all steps of any methods or processes disclosed, may be combined in any combination, except combinations where at least some of the features and / or steps are mutually exclusive.

[0021] Any feature disclosed in this specification, unless stated otherwise, can be replaced by alternative features or equivalents having the same or a similar effect. That is, each feature is one example only of a number of alternative or similar features which could be substituted.

[0022] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a predetermined orientation, be constructed and operated in a predetermined orientation, and therefore cannot be understood as a limitation on the present application.

[0023] In addition, the terms "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features.

[0024] Embodiment 1 As Figs. 1-2 shown, the present application provides a technical solution: A method for balancing the stress of a leveling double-hanging-point independent double-string type suspension fitting string, comprising at least the following steps: Step S1: creating an independent double-hanging string type balance stress model; Specifically, the unequal length combination method is used to simulate and solve the stress balance of two single-sided branch strings, and the stress balance conditions of the whole string are sequentially modeled; Step S2: calculating the stress parameters: Specifically, the front and rear side suspension angle values of the conductor, the length difference of the two single-sided branch strings, and the tension values of the front and rear sides of the conductor are analyzed to form an independent double-hanging string type balance stress leveling calculation model: Step S3: forming an independent double-hanging string type balance stress leveling calculation equation; Specifically, when the stress of the two branch strings is equal, or one of the front and rear branch strings is not stressed, the respective stress balance equations are formed.

[0025] Step S4: determining the string type stress values under various working conditions through stress analysis: Specifically, the string type stress values under various working conditions are determined by calculating and decomposing the stress balance equation.

[0026] Step S5: calculating the front and rear independent string type difference Δ leveling value according to different stress conditions.

[0027] In step S2, the stress of each independent limb and the load are analyzed to form a stress balance formula; In step S2, specifically, the applicable conditions of the independent double-hanging string type before and after the use position are determined: the wire horizontal tension T0 is determined, the wire front side sag angle a and the rear side sag angle b are calculated, the front and rear side insulator string hanging point spacing 2e is determined, and the front and rear side hardware string hanging point height difference angle theta is determined. The stress balance formula formed is: Talpha=T0*TAN(alpha)-T0*TAN(theta) Tbeta=T0*TAN(theta)-T0*TAN(beta) TAN(theta)=Delta / (2e) Wherein Talpha represents the horizontal stress of one side single limb string, Tbeta represents the horizontal stress of the other side single limb string, T0 represents the wire horizontal tension, a represents the sag angle of one side single limb string, b represents the sag angle of the other side single limb string, 2e represents the horizontal spacing of the hanging points of the two side single limb insulator strings, and theta represents the height difference angle of the hanging points of the two side single limb insulator hardware string clamps.

[0028] In step S4, the independent double-hanging string type fixing matching condition is determined by using the tower suspension string type hanging point, and the range limit value of each parameter value is calculated under the condition of stress change by known parameter change; Specifically, the judgment is made by stress analysis: When TAN(theta)=(TAN(alpha)+TAN(beta)) / 2, the independent double-hanging string type is in stress balance, and the overall string type appears without tension difference before and after the side; When Tbeta=T0*TAN(theta)-T0*TAN(beta)=0, the rear side independent string is not stressed, and the overall string type stress acts on the front side independent string type; When Talpha=T0*TAN(alpha)-T0*TAN(theta)=0, the front side independent string is not stressed, and the overall string type stress acts on the rear side independent string type; In step S5, the front and rear side independent string type difference value Delta is respectively: The front and rear side stress balance without tension difference: Delta=e(TAN(alpha)+TAN(beta)); The rear side independent string is not stressed: Delta=2eTAN(beta); The front side independent string is not stressed: Delta=2eTAN(alpha).

[0029] At present, the independent double-hanging string type is widely used in power transmission lines, but there is no clear calculation method and formula for the configuration of the string type when the stress is unbalanced in the mountain area. According to the stress model of the power transmission line, the stress formula of the string type is analyzed, and an effective configuration solution is proposed.

[0030] The above merely describes preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for balancing the force on a double-hanging-point independent double-string suspension hardware string, characterized in that, Includes the following steps: Step S1: Create an independent double-string type equilibrium force model; Step S2: Calculate the force parameters: Step S3: Construct independent double-string type equilibrium force leveling calculation equations; Step S4: Determine the series stress values ​​under various working conditions through stress analysis: Step S5: Calculate the independent string difference Δ leveling value for the front and rear sides according to different stress conditions.

2. The method for balancing the force on a double-hanging-point independent double-string suspension hardware string according to claim 1, characterized in that: In step S1: Specifically, the force balance of two single-sided branches is simulated by using an unequal length combination method, and the force balance conditions of the whole string are determined in turn as the model.

3. The method for balancing the force on a double-hanging-point independent double-string suspension hardware string according to claim 1, characterized in that: In step S2: the suspension angle values ​​of the front and rear sides of the conductor, the length difference of the two single-sided branch strings, and the tension values ​​of the front and rear sides of the conductor are analyzed to form an independent double-hanging string type balanced force leveling calculation model.

4. The method for balancing the force on a double-hanging-point independent double-string suspension hardware string according to claim 1, characterized in that: In step S3: Specifically, when the forces on both sides of the support string are equal, or when one of the front and rear support strings is not subjected to force, their respective force balance equations are formed.

5. The method for balancing the force on a double-hanging-point independent double-string suspension hardware string according to claim 1, characterized in that: In step S4: Specifically, by calculating and decomposing the force balance equation, the series force values ​​under various working conditions are obtained.

6. The method for balancing the force on a double-hanging-point independent double-string suspension hardware string according to claim 1, characterized in that: In step S2, the forces and loads on each independent limb are analyzed to form a force balance formula.

7. The method for balancing the force on a double-hanging-point independent double-string suspension hardware string according to claim 6, characterized in that: In step S2, specifically, the applicable conditions for the front and rear sides of the independent double-string type are initially determined: the horizontal tension T0 of the wire is determined, the suspension angle α of the front side and the suspension angle β of the rear side of the wire are calculated, and the spacing 2e between the insulator string hanging points on the front and rear sides and the height difference angle θ between the hardware string hanging points on the front and rear sides are determined.

8. The method for balancing the force on a double-hanging-point independent double-string suspension hardware string according to claim 6, characterized in that: The resulting force equilibrium formula is: Tα = T0*TAN(α) - T0*TAN(θ) Tβ = T0*TAN(θ) - T0*TAN(β) TAN(θ) = Δ / (2e) Where Tα represents the horizontal force on one side of the single-limb insulator string, Tβ represents the horizontal force on the other side of the single-limb insulator string, T0 represents the horizontal tension of the wire, α represents the suspension angle of one side of the single-limb insulator string, β represents the suspension angle of the other side of the single-limb insulator string, 2e represents the horizontal distance between the hanging points of the single-limb insulator strings on both sides, and θ represents the height difference angle between the hanging points of the single-limb insulator hardware string clamps on both sides.

9. The method for balancing the force on a double-hanging-point independent double-string suspension hardware string according to claim 5, characterized in that: In step S4, the independent double-suspension string type fixed matching conditions are determined using the suspension string type hanging points of the iron tower. The range limits of each parameter value under varying stress conditions are calculated based on known parameter changes; specifically, this is determined through stress analysis. When TAN(θ) = (TAN(α) + TAN(β) / 2, the independent double-hanging string type is in force balance, and the overall string type has no tension difference between the front and back sides; When Tβ=T0*TAN(θ)-T0*TAN(β)=0, the independent strings on the back are not subjected to force, and the force on the entire string type is applied to the independent strings on the front. When Tα=T0*TAN(α)- T0*TAN(θ)=0, the independent strings on the front side are not subjected to force, and the force on the entire string structure is applied to the independent strings on the back side.

10. The method for balancing the force on a double-hanging-point independent double-string suspension hardware string according to claim 1, characterized in that: In step S5, the independent string difference Δ leveling values ​​for the front and rear sides are as follows: The forces on the front and rear sides are balanced with no tension difference: Δ = e( TAN(α) + TAN(β)); The independent string on the back is not subjected to force: Δ = 2eTAN(β); The independent string on the front side is not subjected to force: Δ = 2eTAN(α).

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