CN103022945A - Method for mounting jumper wire of power transmission line tension-resisting tower - Google Patents

Abstract

The invention provides a method for installing jumpers in tension towers of power transmission lines. The method includes: step 1: measuring the chord length l of the jumper and the height angle difference between two suspension points of the jumper

and the jumper to adjust the sag f; step 2: obtain the wire crimping length correction coefficient a and the distance adjustment value b between the wires; step 3: the above l,

Substituting f and a into the relationship between line length and sag (1) generates jumper length L,

Step 4: Cut the wire according to the length L of the jumper wire, crimp the cut wire on the ground and install it on the tower. The jumper installation method of the tension tower of the power transmission line of the present invention can accurately measure the length of the jumper through crimping correction, sag correction and line corner correction, and improves the efficiency of jumper installation.

Description

A method for installing jumpers in tension towers of transmission lines

technical field

The invention relates to the installation technology of transmission lines, in particular to a method for installing jumpers of tension towers of transmission lines. the

Background technique

The installation process of jumpers for tension towers of transmission lines has always been a major technical problem that affects construction quality and work efficiency. The jumper on the strain tower is a part of the transmission line, and its sag directly affects the safe and stable operation of the line. When the construction sag is smaller than the design sag, the insulation gap between the conductor and the cross arm is insufficient; when it is large, the insulation gap of the tower body is too small after being affected by the wind deflection, resulting in a reduction in the insulation level of the line. Therefore, the accuracy of jumper length has a significant impact on transmission line construction. the

For the jumper on the tension tower with a span of several meters to more than 20 meters, the tension is small, and the stiffness of the wire has a great influence on its bending. In addition, the angle of the clamp (the starting point of the wire), whether there is a supporting insulator, The inclination of the insulator string, the angle of rotation of the line, and many other factors cause changes in the shape of the jumper. Therefore, although the design unit has given the installation length of the jumper, the actual jumper sag measured after installation is consistent with the design. There is still a large error between sags. the

At present, most construction units adopt the on-site measurement ratio simulation method for jumper installation. It is to crimp one end of the jumper first, hang it on the tower, determine the length of the line through comparison and marking, and then intercept the wire on the ground. , Crimp the other end of the wire, and finally install and form. The whole installation process requires two high-altitude operations, the process is cumbersome, the efficiency is low, and a certain amount of wires will be wasted. the

In order to simplify the construction process, reduce the amount of high-altitude work, ensure safety, and improve construction quality, it is urgent to study a prefabricated jumper installation method that comprehensively considers the influence of various factors on the site, so as to improve construction efficiency, reduce construction costs, and improve the technical level. The purpose of reducing the labor intensity of construction personnel. the

Contents of the invention

The invention provides a jumper wire installation method for a tension tower of a power transmission line, which can accurately measure the length of the jumper wire, and accurately and efficiently complete the production and installation process of the jumper wire for a tension tower. the

及跳线调整弧垂f；步骤2：获取导线压接长度修正系数a及导线间距离调整值b；步骤3：将所述的l，

f及a代入线长与弧垂之间的关系式（1）生成跳线长L， 

步骤4：根据跳线长L截取导线，在地面上压接截取的所述导线后进行塔上安装。  In order to achieve the above object, the present invention provides a method for installing a wire jumper in a tension tower of a power transmission line, the method comprising: Step 1: measuring the chord length l of the wire jumper, and the height angle difference between the two suspension points of the wire jumper

and the jumper to adjust the sag f; step 2: obtain the wire crimping length correction coefficient a and the distance adjustment value b between the wires; step 3: the above l,

Substituting f and a into the relationship between line length and sag (1) generates jumper length L,

Step 4: Cut the wire according to the length L of the jumper wire, crimp the cut wire on the ground and install it on the tower.

Further, for the case where the strain tower has no jumping strings, after step 3, the method further includes: modifying the sag in the relational expression (1) according to the following formula (2) or formula (3),

$\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; *</span><span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

$\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; *</span><span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; min</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

Then substitute the correction value f* into the relation (4) to get the jumper length L, where f _max is the maximum allowable sag value of the jumper, and f _min is the minimum allowable sag value of the jumper L=L ₁ +L ₂ +L ₃ ;

Further, for the case of a single jump string in the strain tower, measure the distance l ₁ and l ₂ from the hanging point on the drainage plate to the wire hanging hole on the jump string, and substitute l ₁ and l ₂ into formula (2) or formula (3) respectively Correction is performed to obtain the first jumper length L ₁ and the second jumper length L ₂ respectively, where L=L ₁ +L ₂ .

Further, for the case of double jump strings in the strain tower, measure the distances l ₁ and l ₃ from the hanging point on the drainage plate to the wire hanging holes on the jump strings and the distance l ₂ between the hanging holes in the middle of the two jump strings, and take l ₁ and l ₃ Substituting formula (2) or formula (3) for correction, the first jumper length L ₁ and the third jumper length L ₃ are respectively obtained, and l ₂ is substituted into the following relational formula (4) to get the second jumper length L ₂ ,.

Further, when f/l<0.23, the sag in the relationship between the line length and the sag is corrected according to the formula (2). the

Further, when f/l>0.23, the sag in the relationship between the line length and the sag is corrected according to the formula (3). the

Furthermore, for the case of a single jump string of a strain tower, ${\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA00002442908400041.png"\; state="\{\{state\}\}">l</figure-callout>}}_1=\mathrm{MQ}=\sqrt{{\mathrm{MP}}^2+{\mathrm{QP}}^2-2\mathrm{MP}\&CenterDot;\mathrm{QP}\&CenterDot;\cos \frac{\&angle;\mathrm{MPN}}{2}},$ $l_2=\mathrm{N\; Q}=\sqrt{{\mathrm{NP}}^2+{\mathrm{QP}}^2-2\mathrm{NP}\&Center\; Dot;\mathrm{QP}\&Center\; Dot;\cos \frac{\&angle;\mathrm{MPN}}{2}};$ Among them, M and N represent the hanging point of the jumper on the tension insulator respectively, P is the hanging point position of the jumper insulator before the jumper is installed, and Q represents the hanging point of the jumper insulator after the jumper is installed.

The beneficial effect of the embodiment of the present invention is that the jumper installation method of the tension tower of the transmission line of the present invention can accurately measure the length of the jumper by performing crimping correction, sag correction and line corner correction, and improves the installation efficiency of the jumper. efficiency. the

Description of drawings

Fig. 1 is the flow chart of the installation method of the transmission line tension tower jumper of the embodiment of the present invention;

Fig. 2 is the adjustment sag schematic diagram of the embodiment of the present invention;

Fig. 3 is the wire and drainage tube crimping figure of the embodiment of the present invention;

Fig. 4 is the jumper schematic diagram that does not rise without jumping string in the embodiment of the present invention;

Fig. 5 is the wire jumper schematic diagram that jumps up without string jumping according to the embodiment of the present invention;

Fig. 6 is the jumper schematic diagram of the single jump string of the embodiment of the present invention;

Fig. 7 is the jumper schematic diagram of the double jump string of the embodiment of the present invention;

Fig. 8 is the spatial relationship diagram of the jumper connection point of the embodiment of the present invention;

Fig. 9 is a schematic diagram of the measurement and calculation of the total station according to the embodiment of the present invention. the

Detailed ways

As shown in Figure 1, the present invention provides a kind of wire jumper installation method of transmission line strain tower, it is characterized in that, this method comprises:

及跳线调整弧垂f。  Step S301: Measure the chord length l of the jumper and the height angle difference between the two suspension points of the jumper

And jumper to adjust the sag f.

The catenary equation of the wire suspension curve under the uniform load model is a commonly used formula to characterize the mechanical properties of the wire. However, in engineering practice, a simpler approximate calculation method can be used under the condition that the calculation accuracy requirements are met. The parabolic equation (5) of the following sag curve is an approximate calculation method commonly used in engineering calculations. In equation (5), the relationship between the line length and the sag is satisfied:

为两悬挂点间的高差角，f为跳线（调整）弧垂。导线弧垂是指自两悬挂点连线沿荷载方向到导线轴线间的距离。f如图2所示，图2中201代表横担，202代表跳线线夹，203代表引流管。  In formula (5), L represents the length of the jumper, and l is the straight-line distance between the intersection of the two centerlines of the diversion boards on both sides of the jumper (or the intersection of the two centerlines of the jumper diversion board to the hanging point of the jumper clamp), referred to as the jumper string long,

is the height difference angle between the two suspension points, and f is the jumper (adjustment) sag. Conductor sag refers to the distance from the line connecting two suspension points along the load direction to the conductor axis. f As shown in Figure 2, 201 in Figure 2 represents the cross arm, 202 represents the jumper clip, and 203 represents the drainage tube.

Step S302: Obtain the wire crimping length correction coefficient a and the wire-to-wire distance adjustment value b. the

One of the advantages of the present invention is that b is introduced for correction. For the four-split line, the sag given by the design is generally the distance between the line connecting the two suspension points and the midpoint of the upper and lower conductors. If the upper and lower sub-conductors are not adjusted, the calculation result will cause the spacing of the four sub-conductors to be slightly larger than the standard sub-conductor spacing. Define the line distance adjustment value b, the size of the b value is half of the line spacing value. Therefore, when calculating the length of each sub-conductor, the upper two sub-conductors need to add an adjustment value b to make it longer, and the lower two sub-conductors need to subtract a b to make it shorter, so that the distance between the four sub-conductors is the same . the

In addition, for the two-split line, b is 0, and for the six-split and eight-split lines, the calculation method of b is similar to that of the four-split line, and will not be repeated here. the

Another advantage of the present invention is that a is introduced for correction. When the wire is crimped with the drainage tube, the crimping length of the wire is not equal to the length of the drainage tube, and its error will also have a certain impact on the sag. Therefore, the correction factor a of the crimping length is introduced. The distance of the wire section after crimping is shown in Figure 3. the

Step S303: the l, Substitute f and a into the relational expression (1) between the line length and sag to generate the jumper line length L.

The method to calculate the jumper length is to add two adjustment values a and b on the basis of parabolic sag (adjustment sag) and chord length calculation formula, and the result is accurate to centimeters. the

跳线调整弧垂f、导线压接长度修正系数a及导线间距离调整值b均需要通过测量得到。施工人员在上塔测量跳线弦长l、高角差

时，测量点位置统一选择上挂点，使用钢性尺子，尺子一定要绷紧，减小尺子自身重力和风偏造成的测量误差。测量弧垂f时，在导线上的操作人员应使自己的重心位于两水平排列的子导线中间，否则可能会影响测量弧垂的准确性。  Jumper chord length l, height angle difference between the two suspension points of the jumper

Jumper adjustment sag f, conductor crimping length correction coefficient a and distance adjustment value b between conductors all need to be obtained through measurement. Construction workers measure the chord length l and height angle difference of the jumper on the upper tower

At the same time, the location of the measurement point is uniformly selected as the upper hanging point. When using a steel ruler, the ruler must be tightened to reduce the measurement error caused by the ruler's own gravity and wind deflection. When measuring the sag f, the operator on the wire should make his center of gravity in the middle of the two horizontally arranged sub-wires, otherwise the accuracy of the sag measurement may be affected.

Step S304: Cutting the wire according to the length L of the jumper wire, crimping the cut wire on the ground and then installing it on the tower. the

After the length L of the jumper wire is obtained through step S303 and the wire is cut, the two ends of the cut wire with a length of L can be crimped together with the drainage tube 203 on the ground. The interception and crimping of wires need to pay attention to the following:

When measuring the intercepted length of the wire, it is necessary to lift the wire from the ground and measure horizontally along the surface of the wire. After the jumper length is determined, you can print on the uncrimped jumper (draw the crimping position), and then put it on the ground for crimping. When crimping the drain connecting plate on the ground, the jumper should be unfolded, and the wires should not be stressed, and the drain connecting plates at both ends should be in the same plane. After the two ends of the wires are crimped on the ground, place them on the ground below the installation location. The ground should be paved with tarpaulin to prevent damage to the wires. the

After all the drainage lines are installed, install the spacer bars. The installation sequence of the spacer is to install the two ends first, and then install the middle. It is strictly forbidden for construction personnel to directly climb and install spacer bars on the drainage line. the

Preferably, in order to make the jumper length L more accurate, after step S303 , it may also be considered to correct the sag under different skipping forms, and at the same time, it may be considered to correct the line corner. Introduce one by one below:

1. There are three situations for calculating the length of jumper wires in tension towers: no jumper string, single jumper string and double jumper string. the

(1) No jump string

When the jumper is without jumper strings, it is necessary to measure the chord length l of each jumper (the straight-line distance between the hanging points on the two sides of the drainage board), and the vertical distance from the lower plane of the cross arm to the hanging point on the two sides of the jumper. f ₀ , as shown in Figure 4, f ₁ represents the design sag value.

Due to the small span of the jumper, affected by the stiffness of the wire itself, the outlet direction of the clamp is often not in the vertical plane formed by the span, so that the jumper may bend up and down, left and right, and it is difficult to assume a regular parabolic shape. In order to ensure that the gap between the jumper and the discharge part meets the design requirements, the design sag value needs to be adjusted when using the relationship (1) 1 to calculate the length of the jumper. the

For the adjustment of the sag value, according to the statistical results of the field test: the sag error varies with the size of the jumper chord length l. When f/l is small, the error between the measured sag and the designed sag is negative, and the measured sag is smaller than the designed sag; as the span increases, f/l becomes larger, when f/l increases to a certain value When , the error between the measured sag and the design sag becomes positive, and the measured sag is greater than the design sag value. According to field test statistics, the cut-off point of f/l is around 0.23 (the present invention is not limited to 0.23). Since the cut-off point of f/l is affected by many factors (the length of the tension fitting, the suspension angle of the wire, the number of rotation angles, and the height difference of the suspension point, etc.), it is not a fixed value. Therefore, the correction of the sag value can only adopt the piecewise asymptotic correction method. the

When f/l<0.23, the sag correction value is calculated according to the following formula

$\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; *</span><span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Among them, f _max is the maximum allowable sag value of the jumper, and its size is the design sag plus the maximum allowable error value of the jumper sag.

When f/l>0.23, the calculation formula of sag adjustment value is:

$\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; *</span><span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; min</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

Among them, f _min is the minimum allowable sag value of the jumper, and its size is the design sag minus the maximum allowable error value of the jumper sag.

For the case of no string jumping in the strain tower, the sag f in relation (1) needs to be corrected according to formula (2) or formula (3). When f/l<0.23, correct the sag in the relationship between line length and sag according to formula (2). When f/l>0.23, correct the sag in the relationship between line length and sag according to formula (3). the

After the correction, substitute the correction value f* into the relation (4) to obtain the jumper length L, where f _max is the maximum allowable sag value of the jumper, and f _min is the minimum allowable sag value of the jumper. Relation (4) is as follows:

In relation (4), since the distance from the hanging point on the drainage board at both ends to the end of the jumper wire needs to be subtracted in the case of no jumper string, the correction value needs to be subtracted by 2a. the

For the tower type with no rising tension insulator string, the upper cross arm and the middle cross arm should consider the safety distance of the discharge part on the upper and lower sides at the same time, the adjusted sag is generally about 0.1m smaller than the designed sag, and the lower cross arm adjusts the sag Generally take the design sag value. the

When the tension insulator string rises, as shown in Figure 5, in order to ensure that the edge of the cross-arm meets the distance value of the discharge gap, the adjusted sag should be increased appropriately. Generally, the adjusted sag value is larger than the design value, and the upper, middle and lower phases are adjusted. The values increase sequentially, as shown in Table 1. the

Table 1

(2) Single hop string

For the case of a single jump string in a strain tower, measure the distance l ₁ and l ₂ from the hanging point on the drainage plate to the wire hanging hole on the jump string (as shown in Figure 6), and substitute l ₁ and l ₂ into the formula (2) or Formula (3) is corrected to obtain the length L ₁ of the first jumper and the length L ₂ of the second jumper respectively, where L=L ₁ +L ₂ . The rising situation of tension insulators is the same as that without skipping strings, but the sag adjustment value is smaller than that without skipping strings, and the sag adjustment rate is generally about 5% to 10%.

Same as when there is no string skipping, when f/l<0.23, correct the sag in the relationship between line length and sag according to formula (2). When f/l>0.23, correct the sag in the relationship between line length and sag according to formula (3). the

(3) double jump string

For the case of double jump strings in the strain tower, measure the distances l ₁ , l ₃ from the hanging point on the drainage plate to the wire hanging holes on the jump strings, and the distance l ₂ between the hanging holes in the middle of the two jump strings, as shown in Figure 7. Adjusting the sag values l ₁ and l ₃ on both sides is the same as the case of single jump string and no jump string, and the middle sag corresponding to l ₂ does not need to be adjusted because the two hanging points are of the same height. Substituting l ₁ and l ₃ into formula (2) or formula (3) for correction, the first jumper length L ₁ and the third jumper length L ₃ are respectively obtained, and l ₂ is substituted into relational formula (4) to get the second Jumper length L ₂ , L=L ₁ +L ₂ +L ₃ .

Same as when there is no string skipping, when f/l<0.23, correct the sag in the relationship between line length and sag according to formula (2). When f/l>0.23, correct the sag in the relationship between line length and sag according to formula (3). the

2. When correcting the corner of the line, in the case of a single jump string of the tension tower,

${\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="l"\; filenames="HDA00002442908400041.png"\; state="\{\{state\}\}">l</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; MQ</span>}<span\; class="notranslate">\; =</span>\sqrt{{\mathrm{<span\; class="notranslate">\; MP</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; QP</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; MP</span>}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; QP</span>}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; cos</span>}\frac{<span\; class="notranslate">\; \&angle;</span>\mathrm{<span\; class="notranslate">\; MPN</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span>$

${\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; N\; Q</span>}<span\; class="notranslate">\; =</span>\sqrt{{\mathrm{<span\; class="notranslate">\; NP</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; QP</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; NP</span>}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; QP</span>}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; cos</span>}\frac{<span\; class="notranslate">\; \&angle;</span>\mathrm{<span\; class="notranslate">\; MPN</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 7</span>}<span\; class="notranslate">\; )</span>$

Among them, M and N represent the hanging point of the jumper on the tension insulator respectively, P is the hanging point position of the jumper insulator before the jumper is installed, and Q represents the hanging point of the jumper insulator after the jumper is installed. The calculation of the above formulas (6) and (7) is described in detail as follows:

Since the jumper is a space curve, when the jumper is a non-jump string, no matter how the spatial position of the two suspension points changes, the jumper and the two suspension points are always in the same plane, and the line corner will not affect the accuracy of the jumper. In the case of single-jump strings and double-jump strings, the corner of the line will cause the jumper to deviate from the vertical plane formed by the span, causing changes in the spatial position of the hanging point, thereby causing measurement errors in the chord length of the hanging point. Figure 8 is a schematic diagram of the spatial position change relationship of the jumper connection point after considering the line corner. Point G is the cross-arm suspension point, M and N respectively represent the hanging points of the jumper on the tension insulator, and P is the jumper string before installation The position of the hanging point of the insulator, and Q indicates the hanging point position of the jumper insulator after the jumper is installed. the

Because there is an included angle α between GMP and GMQ, GNP and GNQ before and after the installation of the jumper, they are not located in the same plane, resulting in a discrepancy between the measured chord length of the hanging point and the actual hanging point chord length after installation, that is, MP≠MQ , NP≠NQ, the length l deviates. the

It can be seen from the calculation that there is the following relationship between MP and MQ:

$\mathrm{<span\; class="notranslate">\; MQ</span>}<span\; class="notranslate">\; =</span>\sqrt{{\mathrm{<span\; class="notranslate">\; MP</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; QP</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; MP</span>}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; QP</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; cos</span>}\frac{<span\; class="notranslate">\; \&angle;</span>\mathrm{<span\; class="notranslate">\; MPN</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span>$

$\mathrm{<span\; class="notranslate">\; N\; Q</span>}<span\; class="notranslate">\; =</span>\sqrt{{\mathrm{<span\; class="notranslate">\; NP</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; QP</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; NP</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; QP</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; cos</span>}\frac{<span\; class="notranslate">\; \&angle;</span>\mathrm{<span\; class="notranslate">\; MPN</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 7</span>}<span\; class="notranslate">\; )</span>$

In the formula, MP and NP are the distances from the hanging point on the drainage plate to the wire hanging hole on the jumper string measured before the jumper is installed. QP and ∠MPN are calculated according to the following formula:

$\mathrm{<span\; class="notranslate">\; QP</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; d</span>}\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; cos</span>}\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 8</span>}<span\; class="notranslate">\; )</span>$

$<span\; class="notranslate">\; \&angle;</span>\mathrm{<span\; class="notranslate">\; MPN</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; arccos</span>}\frac{{\mathrm{<span\; class="notranslate">\; MP</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; NP</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; MN</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; MP</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; NP</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 9</span>}<span\; class="notranslate">\; )</span>$

Among them, d is the length of the jump string insulator, and MN is the distance between the two hanging points of the diversion plate. In the case of considering the influence of the line corner, the jumper chord length l in the line length calculation formula should be substituted into the values of MQ and NQ instead of MP and NP. Through multiple engineering applications, when the deflection angle α<5°, the influence of the line rotation angle on the jumper accuracy is very small, which can generally be ignored. the

During the above-mentioned sag correction processing and line corner correction, and after obtaining the corrected jumper length, the required data measurement methods are as follows:

The tools that need to be prepared for high-altitude measurement data include a soft ladder and a steel tape measure (with small error). Go up the tower to measure the size, put the zero point of the steel ruler on the large side of the line uniformly, and place the measurement position at the center of the hanging point. For the case of no jumping string, the distance l can be directly measured, and the vertical distance _f0 of the line between the lower plane of the cross-arm and the hanging point on the two sides of the jumper can be measured by using a rope to connect the upper hanging points of the two drainage plates, in the cross-arm Put a level ruler at the point, and measure the vertical distance between the level ruler and the line connecting the two hanging points of the upper left sub-conductor. In the case of a single jump string, l ₁ and l ₁ + l ₂ can be measured first, and then l ₂ can be calculated to facilitate the operation of the operators on the tower. In the case of double jump strings, first measure l ₁ , l ₁ +l ₂ and l ₁ +l ₂ +l ₃ , and then calculate l ₂ and l ₃ , see the attachment for the measurement table. Special attention should be paid to the accurate determination of the wire number. Generally, the measured values of the upper two chord lengths of the four sub-conductors are not much different, and the lower two are not much different. This principle can be used to preliminarily determine whether the measured values are accurate during measurement.

After calculating the length of the jumper secant line, in order to avoid errors caused by the measurement, the method of measuring the wire should be standardized: the steel tape should be pressed tightly on the wire with the left hand, the thumb of the right hand should be on the tape, and the index finger should be under the tape. Close to the wire and measure it forward, and at the same time, someone needs to press the tape measure and the wire together before and after the measurer. the

After the jumper is measured, draw and print, cut the line on the spot, and then draw and print the installation position of the spacer bar on the No. 1 sub-conductor according to the design requirements. After crimping the diversion plates at both ends of the jumper, install the jumper on the tower, and use the human lifting block (Φ15 nylon rope) to lift the wire. During the whole process of jumper installation, the soft ladder should be used as a load-bearing tool for construction personnel, and the lower end should be held by a small rope to adjust the distance from the jumper and the drainage line. Install the spacer bar according to the printed position of the spacer bar on the No. 1 sub-conductor, and make it perpendicular to the other three sub-conductors, which can greatly shorten the construction time. the

The following is an expansion of the fabrication process of the tension tower jumper assembly:

The chord length and height difference between the two hanging points of the jumper are generally measured by workers working at heights on the tower, and the efficiency is relatively low. If a total station is used to measure the distance between two points on the tower, high-altitude operations can be omitted, which not only ensures safety, but also improves work efficiency. The measurement principle is shown in Figure 9. Assuming that the distance AD is the distance between two points to be measured on the tower, the total station is located at point O, and points B and C are the vertical projections of points A and D on the horizontal plane respectively. Use the total station to measure the elevation angles ∠AOB, ∠DOC, The horizontal angle ∠BOC and the distance OA and OD between the total station and the measured point. According to the spatial relationship shown in Figure 9, if AE∥BC passes through point A and intersects DC at point E, then AE﹦BC, AE⊥DC, and the height difference DE between point A and point D can be measured. The length of AD can be calculated according to the following formula. the

$\mathrm{<span\; class="notranslate">\; AD</span>}<span\; class="notranslate">\; =</span>\sqrt{{\mathrm{<span\; class="notranslate">\; AE</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; DE</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 10</span>}<span\; class="notranslate">\; )</span>$

$\mathrm{<span\; class="notranslate">\; AE</span>}<span\; class="notranslate">\; =</span>\sqrt{{\mathrm{<span\; class="notranslate">\; OB</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; OC</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; OB</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; OC</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; cos</span>}<span\; class="notranslate">\; \&angle;</span>\mathrm{<span\; class="notranslate">\; BOC</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 11</span>}<span\; class="notranslate">\; )</span>$

Among them, OB=OA·cos∠AOB, OC=OD·cos∠DOC. the

The beneficial effect of the embodiment of the present invention is that the jumper installation method of the tension tower of the transmission line according to the present invention can accurately measure the length of the jumper by performing crimping correction, sag correction and line corner correction, and improves the installation efficiency of the jumper. efficiency. the

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Protection scope, within the spirit and principles of the present invention, any modification, equivalent replacement, improvement, etc., shall be included in the protection scope of the present invention. the

Claims (7)

1. A transmission line tension tower jumper installation method, is characterized in that, described method comprises: Step 1: Measure the chord length l of the jumper and the height angle difference between the two suspension points of the jumper

And the jumper to adjust the sag f; Step 2: Obtain the wire crimping length correction factor a and the distance adjustment value b between wires; Step 3: Put the l,

Substituting f and a into the relationship between line length and sag (1) generates jumper length L, $\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; l</span>}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; 8</span>}\mathrm{<span\; class="notranslate">\; f</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}\mathrm{<span\; class="notranslate">\; l</span>}}\stackrel{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; cos</span>}\mathrm{<span\; class="notranslate">\; \&phi;</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&PlusMinus;</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ;</span>$ Step 4: Cut the wire according to the length L of the jumper wire, crimp the cut wire on the ground and install it on the tower. 2. The method according to claim 1, characterized in that, for the tension tower without jumping strings, after step 3, the method further includes: the sag in the relational expression (1) according to the following formula ( 2) or formula (3) for correction, $\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; *</span><span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$ $\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; *</span><span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; min</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$ Then substitute the correction value f* into the relation (4) to obtain the length L of the jumper wire, where f _max is the maximum allowable sag value of the jumper wire, and f _min is the minimum allowable sag value of the jumper wire;

3. method according to claim 2, it is characterized in that, for strain tower single jump string situation, measure the hanging point on the drainage plate to the distance _l1 and _l2 of the wire hanging hole on the jump string, respectively _l1 and l ₂ is substituted into formula (2) or formula (3) for correction to obtain the first jumper length L ₁ and the second jumper length L ₂ respectively, where L=L ₁ +L ₂ . 4. method according to claim 2, it is characterized in that, for the tension tower double jump string situation, measure the hanging point on the drainage plate to the distance _l1 , _l3 of the wire hanging hole on the jump string and the middle hang of two jump strings For the distance l ₂ of the hole, respectively substitute l ₁ and l ₃ into formula (2) or formula (3) for correction, respectively obtain the length of the first jumper L ₁ and the length of the third jumper L ₃ , and substitute l ₂ into the following relationship Formula (4) obtains the second jumper length L ₂ , and L=L ₁ +L ₂ +L ₃ . 5. The method according to claim 2, 3 or 4, characterized in that when f/l<0.23, the sag in the relationship between the line length and sag is corrected according to formula (2). 6. The method according to claim 2, 3 or 4, characterized in that when f/l>0.23, the sag in the relationship between the line length and sag is corrected according to formula (3). 7. method according to claim 3, is characterized in that, for strain tower single jump string situation, $l_1=\mathrm{MQ}=\sqrt{{\mathrm{MP}}^2+{\mathrm{QP}}^2-2\mathrm{MP}\&Center\; Dot;\mathrm{QP}\&Center\; Dot;\cos \frac{\&angle;\mathrm{MPN}}{2}},$ $l_2=\mathrm{N\; Q}=\sqrt{{\mathrm{NP}}^2+{\mathrm{QP}}^2-2\mathrm{NP}\&Center\; Dot;\mathrm{QP}\&Center\; Dot;\cos \frac{\&angle;\mathrm{MPN}}{2}};$ Among them, M and N represent the hanging point of the jumper on the tension insulator respectively, P is the hanging point position of the jumper insulator before the jumper is installed, and Q represents the hanging point of the jumper insulator after the jumper is installed.

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