CN105095629A - Wind pressure non-uniform coefficient calculation method based on measured data - Google Patents

Abstract

The present invention relates to a method for determining wind pressure non-uniformity coefficient based on measured data. The method comprises the following steps: (1) determining the apparent wind load at a single point on the conductor; (2) determining the apparent wind load of the entire conductor; 3) Determine the actual wind load of the entire wire; (4) Determine the uneven coefficient of wind pressure. The wind pressure non-uniformity coefficient obtained by this method more truly reflects the spatial correlation of the wind load, and accurately takes into account the influence of the strong fluid-solid coupling between the conductor and the airflow.

Description

A Calculation Method of Wind Pressure Nonuniformity Coefficient Based on Measured Data

Technical field:

The invention relates to a method for determining the coefficient of wind pressure non-uniformity, and more particularly to a method for determining the coefficient of wind pressure non-uniformity based on measured data.

Background technique:

Conductor wind pressure non-uniformity coefficient first needs to measure the wind speed distributed along the entire conductor and the inclination data of the conductor suspension string under this wind speed condition, and then use an appropriate calculation method to obtain the apparent wind load and The actual wind load, the ratio of the two is the wind pressure non-uniformity coefficient.

The current power industry standard "Code for Design of 110kV～750kV Overhead Transmission Lines" provides the calculation formula of wind pressure unevenness coefficient, but the explanation of the article does not give how to get the calculation formula, nor does it give the calculation formula based on the measured data. The method of compressing the measured value of the non-uniformity coefficient. Under this background, the present invention is based on the non-uniform distribution of wind speed data along the wire and the inclination data of the suspension series, and provides a method for back-calculating the ratio of the actual wind load to the apparent wind load based on the above-mentioned measured data, that is, the wind pressure non-uniformity coefficient .

Invention content:

The purpose of the present invention is to provide a method for determining the wind pressure unevenness coefficient based on measured data. The wind pressure unevenness coefficient obtained by the method more truly reflects the spatial correlation of wind loads, and accurately takes into account the difference between the conductor and the airflow. The influence of the strong fluid-solid coupling effect.

In order to achieve the above object, the present invention adopts the following technical solutions: a method for determining wind pressure unevenness coefficient based on measured data, said method comprising the following steps:

(1) Determine the apparent wind load at a single point on the wire;

(2) Determine the apparent wind load of the entire wire;

(3) Determine the actual wind load of the entire wire;

(4) Determine the coefficient of wind pressure unevenness.

A method for determining wind pressure unevenness coefficient based on measured data provided by the present invention, the wind load in the step (1) is determined by the following formula (1):

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0.5</span>}\mathrm{<span\; class="notranslate">\; \&rho;</span>}{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; sin</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Among them, ρ is the air density, U _i is the average wind speed observed at a measuring point, φ _i is the angle between the horizontal wind direction and the extension direction of the wire, l _i is the length of the wire that can be represented at this point, and C _d is the current The drag coefficient at the level of Reynolds number, D is the wire diameter.

The present invention provides a method for determining the wind pressure non-uniformity coefficient based on measured data. In the step (2), at least three wind speed observation points are provided for the entire wire.

Another preferred method for determining the coefficient of wind pressure inhomogeneity based on measured data provided by the present invention, in the step (2), the entire file conductor is provided with three wind speed observation points, and its wind load is determined by the following formula (2):

P _c =P _c1 +P _c2 (2)

Among them, P _c1 is the moment of the outermost wire hanging point of the entire file of wires, and P _c2 is the moment of the other outermost wire hanging point of the entire file of wires.

Another preferred method for determining the coefficient of wind pressure unevenness based on measured data provided by the present invention is that the moment P _c1 of the outermost wire hanging point of the entire file of wires is determined by the following formula (3):

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0.5</span>}\mathrm{<span\; class="notranslate">\; \&rho;</span>}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; L</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \{</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 6</span>}{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; sin</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 6</span>}{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; sin</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 6</span>}{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; sin</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\text{<span class="notranslate"> 3</span>}<span\; class="notranslate">\; )</span>$

Among them, L is the span of the conductor, U ₁ is the average wind speed observed at the first measuring point, φ ₁ is the angle between the horizontal wind direction observed at the first measuring point and the extension direction of the conductor; U ₂ is the angle observed at the second measuring point Average wind speed, φ ₂ is the angle between the horizontal wind direction observed at the second measuring point and the extension direction of the wire; U ₃ is the average wind speed observed at the third measuring point, φ ₃ is the horizontal wind direction observed at the third measuring point and the extension direction of the wire angle.

Another preferred method for determining the coefficient of wind pressure unevenness based on measured data provided by the present invention is that the moment P _c2 of the other outermost wire hanging point of the entire file wire is determined by the following formula (4):

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0.5</span>}\mathrm{<span\; class="notranslate">\; \&rho;</span>}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; L</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \{</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 6</span>}{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 6</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; sin</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; 6</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 6</span>}{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 5</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; sin</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; 5</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 6</span>}{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; sin</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

Among them, L is the wire span, U ₆ is the average wind speed observed at the sixth measuring point, φ ₆ is the angle between the horizontal wind direction observed at the sixth measuring point and the extension direction of the wire; U ₅ is the wind speed observed at the fifth measuring point Average wind speed, φ ₅ is the angle between the horizontal wind direction observed at the fifth measuring point and the extension direction of the wire; U ₄ is the average wind speed observed at the fourth measuring point, φ ₄ is the horizontal wind direction observed at the fourth measuring point and the extension direction of the wire angle.

Another preferred method for determining the coefficient of wind pressure inhomogeneity based on measured data provided by the present invention, the actual wind load in the step (3) is determined by the following formula (5):

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}\mathrm{<span\; class="notranslate">\; the\; tan</span>}\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{\mathrm{<span\; class="notranslate">\; \&theta;</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

Among them, W _d is the weight of the conductor and the hanging string distributed at a certain conductor hanging point, is the average value of the inclination angle of the hanging string in the period corresponding to the wind speed observation period.

Another preferred method for determining the coefficient of wind pressure inhomogeneity based on measured data provided by the present invention, the wind pressure inhomogeneity coefficient in the step (4) is determined by the following formula (6):

α=P _m /P _C (6)

Compared with the closest prior art, the technical solution provided by the present invention has the following excellent effects

1. The present invention is realized based on the analysis of measured data, which can better consider various factors, such as surface roughness, turbulence integration scale, especially the influence of strong fluid-solid coupling effect between the conductor and the surrounding gas, and the obtained wind pressure non-uniformity coefficient more authentic and reliable;

2. The present invention lays the foundation for actually measuring the wind pressure unevenness coefficient of conductors;

3. The present invention provides the actual measurement method and the actual measurement data support for obtaining the non-uniform wind pressure coefficient of the conductor;

4. The coefficient of wind pressure unevenness obtained by the method of the present invention has high accuracy.

Description of drawings

Fig. 1 is a schematic flow sheet of the method of the present invention;

Fig. 2 is the distribution schematic diagram of the apparent wind load of a certain continuous two-grade wire of the present invention along the wire;

1-The installation point of the anemometer; 2-The installation point of the hanging string inclinometer.

Detailed ways

Below in conjunction with embodiment the invention is described in further detail.

Example 1:

As shown in Figure 1-2, the invention of this example is to obtain the wind pressure uneven distribution coefficient of the LGJ-800/70 type conductor under the condition of 300m span. The layout of wind speed observation points and hanging string wind deviation angle observation points is shown in Figure 1. In two consecutive gear spans, a wind speed observation point is arranged in every third of the gear span, a total of 6 wind speed observation points.

First, calculate the apparent wind loads P ₁ ～ P ₆ at each point based on formula (1), and the values of the calculation parameters are shown in Attached Table 1.

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0.5</span>}\mathrm{<span\; class="notranslate">\; \&rho;</span>}{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; sin</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Among them, ρ is the air density, U _i is the average wind speed observed at a measuring point, φ _i is the angle between the horizontal wind direction and the extension direction of the wire, l _i is the length of the wire that can be represented at this point, and C _d is the current The drag coefficient at the level of Reynolds number, D is the wire diameter.

After determining the apparent wind loads P ₁ to P ₆ at each point, take the moment for the wire hanging point A, and formulate the bending moment balance equation, the following relationship can be obtained:

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0.5</span>}\mathrm{<span\; class="notranslate">\; \&rho;</span>}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; L</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \{</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 6</span>}{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; sin</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 6</span>}{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; sin</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 6</span>}{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; sin</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\text{<span class="notranslate"> 3</span>}<span\; class="notranslate">\; )</span>$

Among them, L is the span of the conductor, U ₁ is the average wind speed observed at the first measuring point, φ ₁ is the angle between the horizontal wind direction observed at the first measuring point and the extension direction of the conductor; U ₂ is the angle observed at the second measuring point Average wind speed, φ ₂ is the angle between the horizontal wind direction observed at the second measuring point and the extension direction of the wire; U ₃ is the average wind speed observed at the third measuring point, φ ₃ is the horizontal wind direction observed at the third measuring point and the extension direction of the wire angle.

Take the moment for the hanging point B of the wire, and formulate the balance equation of the bending moment, the following relationship can be obtained:

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0.5</span>}\mathrm{<span\; class="notranslate">\; \&rho;</span>}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; L</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \{</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 6</span>}{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 6</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; sin</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; 6</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 6</span>}{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 5</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; sin</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; 5</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 6</span>}{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; sin</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

Among them, L is the wire span, U ₆ is the average wind speed observed at the sixth measuring point, φ ₆ is the angle between the horizontal wind direction observed at the sixth measuring point and the extension direction of the wire; U ₅ is the wind speed observed at the fifth measuring point Average wind speed, φ ₅ is the angle between the horizontal wind direction observed at the fifth measuring point and the extension direction of the wire; U ₄ is the average wind speed observed at the fourth measuring point, φ ₄ is the horizontal wind direction observed at the fourth measuring point and the extension direction of the wire angle.

Then the hanging point C has the following relational expression:

$\begin{array}{c}{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0.5</span>}\mathrm{<span\; class="notranslate">\; \&rho;</span>}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; L</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \{</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; sin</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 6</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; sin</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; 6</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\\ <span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; sin</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 5</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; sin</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; 5</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; sin</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; sin</span>}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \}</span>\end{array}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Substituting the parameters in Attached Table 1 into the above formula, the apparent wind load of the entire wire is obtained as P _C is 2185N.

The mass of the LGJ-800/70 type conductor is 2.791kg per meter. The gravity of the 300m-long conductor at the hanging point C shown in Figure 1 is 8205N, and the mass of the hanging string is 147.5kg. The W _d at the hanging point C is 9650.5N. The average value of the inclination angle of the hanging string corresponding to the wind speed data in the current period is 10°, the W _d and Value on behalf of the following formula (5), P _m is 1701.6N. Substituting the values of P _m and P _C into formula (6), the wind pressure non-uniformity coefficient α is 0.6421.

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}\mathrm{<span\; class="notranslate">\; the\; tan</span>}\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{\mathrm{<span\; class="notranslate">\; \&theta;</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

α=P _m /P _C (6)

Among them, W _d is the weight of the conductor and the hanging string distributed at a certain conductor hanging point, is the average value of the inclination angle of the hanging string in the period corresponding to the wind speed observation period.

Table 1

ρ(kg/m ³ ) C _d l ₁ ~ l ₆ (m) D(m) U ₁ sinφ ₁ 1.225 1.1 100 0.039 16.8 U ₂ sinφ ₂ U ₃ sinφ ₃ U ₄ sinφ ₄ U ₅ sinφ ₅ U ₆ sinφ ₆ 18.0 18.5 18.0 16.8 14.8

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be implemented Modifications or equivalent replacements to the specific embodiments, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention, shall be covered by the scope of the present claims.

Claims (8)

1., based on a wind evil attacking lung defining method for measured data, it is characterized in that: said method comprising the steps of:

(1) determine that on wire, apparent wind load is located in a single point position;

(2) determine that whole shelves wire table is serve as a lookout load;

(3) the actual wind load of whole shelves wire is determined;

(4) wind evil attacking lung is determined.

2. a kind of wind evil attacking lung defining method based on measured data as claimed in claim 1, is characterized in that: the wind load in described step (1) is determined by following formula (1):

Wherein, ρ is atmospheric density, U _ifor certain measuring point observes mean wind speed, φ _ifor the angle of horizontal wind direction and wire bearing of trend, l _ifor the conductor length that this place, some position can represent, C _dfor the resistance coefficient of wire under current Reynolds Number level, D is diameter of wire.

3. a kind of wind evil attacking lung defining method based on measured data as claimed in claim 2, is characterized in that: in described step (2), whole shelves wire is provided with at least three Wind observation points.

4. a kind of wind evil attacking lung defining method based on measured data as claimed in claim 3, is characterized in that: in described step (2), whole shelves wire is provided with three Wind observation points, and its wind load is determined by following formula (2):

P _c＝P _c1+P _c2(2)

Wherein, P _c1for whole shelves wire outermost conducting wire hanging point gets square, P _c2for another outermost conducting wire hanging point of whole shelves wire gets square.

5. a kind of wind evil attacking lung defining method based on measured data as claimed in claim 4, is characterized in that: described whole shelves wire outermost conducting wire hanging point gets square P _c1determined by following formula (3):

Wherein, L is wire span, U ₁be the mean wind speed that the first measuring point observes, φ ₁it is the angle that the first measuring point observes horizontal wind direction and wire bearing of trend; U ₂be the mean wind speed that the second measuring point observes, φ ₂it is the angle that the second measuring point observes horizontal wind direction and wire bearing of trend; U ₃be the mean wind speed that the 3rd measuring point observes, φ ₃it is the angle that the 3rd measuring point observes horizontal wind direction and wire bearing of trend.

6. a kind of wind evil attacking lung defining method based on measured data as claimed in claim 4, is characterized in that: described another outermost conducting wire hanging point of whole shelves wire gets square P _c2determined by following formula (4):

Wherein, L is wire span, U ₆be the mean wind speed that the 6th measuring point observes, φ ₆it is the angle that the 6th measuring point observes horizontal wind direction and wire bearing of trend; U ₅be the mean wind speed that the 5th measuring point observes, φ ₅it is the angle that the 5th measuring point observes horizontal wind direction and wire bearing of trend; U ₄be the mean wind speed that the 4th measuring point observes, φ ₄it is the angle that the 4th measuring point observes horizontal wind direction and wire bearing of trend.

7. a kind of wind evil attacking lung defining method based on measured data as claimed in claim 4, is characterized in that: in described step (3), actual wind load is determined by following formula (5):

Wherein, W _dthe wire distributed for certain conducting wire hanging point place and suspension string gravity, for suspension string dip mean in the period corresponding to the Wind observation time period.

8. a kind of wind evil attacking lung defining method based on measured data as claimed in claim 7, is characterized in that: the wind evil attacking lung in described step (4) is determined by following formula (6):

α＝P _m/P _C(6)