CN103022945B - Method for mounting jumper wire of power transmission line tension-resisting tower - Google Patents

Abstract

The invention provides a method for mounting a jumper wire of a power transmission line tension-resisting tower. The method comprises the following steps of: 1: measuring a jumper wire chord length l, a high angle difference phi of two suspension points of the jumper wire and a jumper wire adjusting sag f; 2: obtaining a lead wire compression joint correction factor a and a lead wire distance adjusting value b, wherein the correction factor a is a distance from a centre line intersection point of a drain tube to a wire section after compression joint, and the adjusting value b is half of the wire space value; 3: substituting the jumper wire chord length l, the high angle difference phi, the jumper wire adjusting sag f and the correction factor a into a relation formula (1) shown in the description between a wire length and the sag to generate a jumper wire length L; and 4: cutting a lead wire according to the jumper wire length L, arranging the cut lead wire on the ground in a compression joint manner and mounting on the tower. According to the method for mounting the jumper wire of the power transmission line tension-resisting tower provided by the invention, compression joint revision, sag revision and line corner revision treatment are carried out, so that the length of the jumper wire can be accurately measured and the efficiency of mounting the jumper wire is improved.

Description

A kind of strain tower of transmission line wire jumper installation method

Technical field

The invention relates to transmission line mounting technique, particularly about a kind of strain tower of transmission line wire jumper installation method.

Background technology

The strain tower wire jumper mounting process of transmission line is the large technical barrier affecting construction quality and operating efficiency always.Wire jumper on strain tower is as a part for transmission line, and the size of its sag directly affects the safe and stable operation of circuit.When sag of constructing is less than design sag, then cause the clearance for insulation between wire and cross-arm inadequate; Time larger, after affecting by windage yaw, the clearance for insulation of tower body can be caused too small, cause the reduction of line insulation level.Therefore, the precision of wire jumper length is very remarkable on the impact of transmission line construction.

For the wire jumper on the strain tower of span between several meters to more than 20 meters, its tension force is little, conductor rigidity is large on its bending impact, in addition the angle of wire clamp (starting point of wire), the impact with or without many factors such as the gradient of supporting insulator, insulator string, the corner number of degrees of circuit, cause the change of wire jumper form, therefore, although designing unit gives wire jumper installation length, and still there is larger error between the actual wire jumper sag measured after installing and design sag.

At present, for wire jumper install that most unit in charge of construction takes be on-the-spot amount than simulation, it is the one end first crimping wire jumper, be suspended from tower, by comparison, print and determine line length, then intercepted wire on ground, the crimping lead wire other end, finally installation forming again.Whole installation process needs twice work high above the ground, and operation is loaded down with trivial details, and efficiency is lower, but also a certain amount of wire can be caused to waste.

In order to simplify work progress, reducing amount of high-altitude operation, ensure fail safe, improve construction quality, urgently study a kind of assembled wire jumper installation method considering on-the-spot each factor impact, thus reach the object improving efficiency of construction, reduce construction cost, the workmen's labour intensity that upgrades technologies, alleviates.

Summary of the invention

The invention provides a kind of strain tower of transmission line wire jumper installation method, accurately to measure wire jumper line length, the strain tower wire jumper that completes of precise and high efficiency makes and mounting process.

To achieve these goals, the invention provides a kind of strain tower of transmission line wire jumper installation method, the method comprises: step 1: the high angular difference measuring wire jumper chord length l, wire jumper two hitch point and wire jumper adjustment sag f; Step 2: obtain conductor compression jointing length correction coefficient a and separation adjusted value b, wherein, described correction factor a is the distance of the wire section after drainage tube center line intersection point to crimping, and the size of described adjusted value b is the half of wire pitch value; Step 3: by described wire jumper chord length l, high angular difference the relational expression (1) that sag f and correction factor a substitutes between line length and sag generates the long L of wire jumper, step 4: intercept wire according to the long L of wire jumper, carry out after crimping the described wire of intercepting on the ground tower is installed.

Further, for strain tower without jumping string situation, after step 3, described method also comprises: revised according to formula (2) or formula (3) below by the sag in relational expression (1),

As f/l<0.23, $f*=\frac{f}{l}f+(1-\frac{f}{l})f_{\max }---\left(2\right)$

As f/l>0.23, $f*=\frac{f}{l}f+(1-\frac{f}{l})f_{\min }---\left(3\right)$

Then the sag f in relational expression (4) is replaced to obtain the long L of wire jumper with correction value f*, wherein, f _maxsag permissible value is allowed, f for wire jumper is maximum _minsag permissible value L=L is allowed for wire jumper is minimum ₁+ L ₂+ L ₃;

Further, for strain tower single-hop string situation, on measurement drainage plate, hanging point is to the distance l jumping string upper conductor hanging hole ₁and l ₂, respectively by l ₁and l ₂substitution formula (2) or formula (3) are revised, and obtain the long L of the first wire jumper respectively ₁and the long L of the second wire jumper ₂, L=L ₁+ L ₂.

Further, for strain tower double jump string situation, on measurement drainage plate, hanging point is to the distance l jumping string upper conductor hanging hole ₁, l ₃and the distance l of the middle hanging hole of double bounce string ₂, respectively by l ₁and l ₃substitution formula (2) or formula (3) are revised, and obtain the long L of the first wire jumper respectively ₁and the long L of the 3rd wire jumper ₃, by l ₂substitute into described relational expression (4) and obtain the long L of the second wire jumper ₂, L=L ₁+ L ₂+ L ₃.

Further, for strain tower single-hop string situation, $l_1=\mathrm{MQ}=\sqrt{{\mathrm{MP}}^2+{\mathrm{QP}}^2-2\mathrm{MP}\&CenterDot;\mathrm{QP}\&CenterDot;\cos \frac{\&angle;\mathrm{MPN}}{2}},l_2=\mathrm{NQ}=\sqrt{{\mathrm{NP}}^2+{\mathrm{QP}}^2-2\mathrm{NP}\&CenterDot;\mathrm{QP}\&CenterDot;\cos \frac{\&angle;\mathrm{MPN}}{2}};$ Wherein, M, N represent the hanging point of wire jumper on strain insulator respectively, and P is that front jumping insulator string hanging point position installed by wire jumper, and Q then represents the jumping insulator string hanging point position after wire jumper installation.

The beneficial effect of the embodiment of the present invention is, strain tower of transmission line wire jumper installation method of the present invention, by carrying out crimping correction, sag correction and circuit corner correcting process, can measure wire jumper long accurately, improves the efficiency that wire jumper is installed.

Accompanying drawing explanation

Fig. 1 is the strain tower of transmission line wire jumper installation method flow chart 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 that the wire of the embodiment of the present invention crimps figure with drainage tube;

Fig. 4 is the wire jumper schematic diagram do not raised up without jumping string of the embodiment of the present invention;

Fig. 5 is the wire jumper schematic diagram raised up without jumping string of the embodiment of the present invention;

Fig. 6 is the wire jumper schematic diagram of the single-hop string of the embodiment of the present invention;

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

Fig. 8 is the wire jumper tie point spatial relation graph of the embodiment of the present invention;

Fig. 9 is that the total station survey of the embodiment of the present invention calculates schematic diagram.

Embodiment

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

Step S301: the high angular difference measuring wire jumper chord length l, wire jumper two hitch point and wire jumper adjustment sag f.

Wire catenary curve catenary equation formula under uniform load model is the common-used formula characterizing wire mechanical characteristic.But in engineering reality, under the condition meeting computational accuracy requirement, easier approximate calculation method can be adopted.The parabolic equation formula (5) of following catenary curve is approximate calculation method conventional in engineering calculation, in equation (5), meets between line length and sag:

In formula (5), L represents that wire jumper is long, and l is the air line distance of (or wire jumper drainage plate two center line intersection point is to jumper clamp hanging point) between the drainage plate two center line intersection point of wire jumper both sides, is called for short wire jumper chord length, be the height difference angle between two hitch points, f is wire jumper (adjustment) sag.Conducting wire sag refers to the distance from two hitch point lines are along load direction to wire axis.As shown in Figure 2, in Fig. 2,201 represent cross-arm to f, and 202 represent jumper clamp, and 203 represent drainage tube.

Step S302: obtain conductor compression jointing length correction coefficient a and separation adjusted value b.

One of advantage of the present invention is that having introduced b revises.For quadripartion circuit, design the sag that provides and be generally two hitch points and be wired to distance between upper and lower wire mid point.If do not adjusted upper and lower sub-conductor, result of calculation can cause four root wire pitch slightly larger than standard sub-conductor spacing.Definition wires spacing adjusted value b, the size of b value is the half of wire pitch value.Therefore, when calculating the line length of each sub-conductor, above two root wires need add an adjusted value b, make it lengthen, below two root wires need cut a b, make it shorten, thus make four root wire pitch identical.

In addition, for binary fission circuit, b is 0, and for six divisions and eight division circuits, the computational methods of b are similar to quadripartion, repeat no more.

Another advantage of the present invention is that having introduced a revises.When wire crimps with drainage tube, conductor compression jointing length is also not equal to drainage tube length, and its error also can affect to sag, therefore, introduce crimping length correction factor a, a refers to the distance of the wire section after drainage tube center line intersection point to crimping, as shown in Figure 3.

Step S303: by described l, the relational expression (1) that f and a substitutes between line length and sag generates the long L of wire jumper.

The method calculating wire jumper length increases by two adjusted value a and b more exactly on the basis of parabola sag (adjustment sag), chord length computing formula, and result is accurate to centimetre.

The high angular difference of wire jumper chord length l, wire jumper two hitch point wire jumper adjustment sag f, conductor compression jointing length correction coefficient a and separation adjusted value b all need to obtain by measuring.Workmen measures wire jumper chord length l, high angular difference at upper tower time, measurement point position is unified selects upper hanging point, and use rigidity ruler, ruler must be tightened, the measure error that reduction ruler self gravitation and windage yaw cause.When measuring sag f, the operating personnel on wire should make the center of gravity of oneself be positioned in the middle of two horizontal sub-conductors, otherwise may affect the accuracy measuring sag.

Step S304: intercept wire according to the long L of wire jumper, carry out after crimping the described wire of intercepting on the ground tower is installed.

Obtaining after the long L of wire jumper carries out wire intercepting by step S303, can be that two ends and the drainage tube 203 of the wire of L is crimped together on the ground by the length of intercepting.The intercepting of wire and crimping should be noted that content below:

When wire intercepted length measures, wire need be lifted from ground, along conductive line surfaces horizontal survey.After wire jumper length determines, picture print (drawing crimping position) can be carried out on the wire jumper do not crimped, then be put into ground and crimp.When ground crimping drainage connecting plate, wire jumper should be launched, not make wire stressed, the drainage connecting plate at two ends will in same plane.Wire two ends are after ground has crimped, and be placed on the ground below installation site, ground tarpaulin carries out place mat, prevents wire from damaging.

After the whole installation of drainage thread, installation interval rod.Conductor spacer erection sequence first installs two, then install centre.Workmen is forbidden directly to climb installation interval rod on drainage thread.

Preferably, in order to make the long L of wire jumper more accurate, after step S303, the sag that it is also conceivable to difference is jumped under string form carries out correcting process, can consider to revise circuit corner simultaneously.Make introductions all round below:

1, strain tower wire jumper length gauge point counting three kinds of situations: nothing jumps string, single-hop string and double jump string, the sag correcting process under the string of the different jumping of difference below form.

(1) without jumping string

Wire jumper is without when jumping string, needs to measure every root wire jumper chord length l (air line distance on the drainage plate of both sides between hanging point), and the vertical range f of hanging point line on cross-arm lower plane to wire jumper both sides drainage plate ₀, as shown in Figure 4, f ₁represent design sag.

Because wire jumper span is less, by the impact of wire stiffness by itself, wire clamp Way out, often not in vertical plane formed by span, causes wire jumper may produce up and down, bend right and left, and is difficult to the parabolic shape in rule.For ensureing that the gap of wire jumper to discharge portion meets design requirement value, when employing relational expression (1) 1 carries out wire jumper length computation, need adjusted design sag.

For the adjustment of sag, the statistics according to field test: sag error changes with the size of wire jumper chord length l.When f/l is less, actual measurement sag is negative with design sag error, and actual measurement sag is less than design sag; Along with the increase of span, f/l becomes large, and when f/l increases to certain value, actual measurement sag just becomes with design sag error, and actual measurement sag is greater than design sag.The separation of the statistics f/l of foundation field test is about 0.23 (the invention is not restricted to 0.23).Because the separation of f/l is by various factors (length of strain hardware fitting, wire overhanging corner, the corner number of degrees and the hitch point discrepancy in elevation etc.), it is not a fixed value.Therefore, the correction of sag can only adopt the asymptotic revised law of segmentation.

As f/l<0.23, sag correction value is calculated as follows

$f*=\frac{f}{l}f+(1-\frac{f}{l})f_{\max }---\left(2\right)$

Wherein, f _maxallow sag permissible value for wire jumper is maximum, its size adds wire jumper sag limits of error value for designing sag.

As f/l>0.23, sag adjustment value calculating formula is:

$f*=\frac{f}{l}f+(1-\frac{f}{l})f_{\min }---\left(3\right)$

Wherein, f _minallow sag permissible value for wire jumper is minimum, its size deducts wire jumper sag limits of error value for designing sag.

For strain tower without jumping string situation, need the sag f in relational expression (1) to revise according to formula (2) or formula (3).As f/l<0.23, the sag in the relational expression between line length and sag is revised according to formula (2).As f/l>0.23, the sag in the relational expression between line length and sag is revised according to formula (3).

After correction, correction value f* is substituted into relational expression (4) and obtains the long L of wire jumper, wherein, f _maxsag permissible value is allowed, f for wire jumper is maximum _minsag permissible value is allowed for wire jumper is minimum.Relational expression (4) is as follows:

In relational expression (4), due to hanging point need be cut on the drainage plate of two ends without the situation of jumping string to the distance of wire jumper termination, so correction value needs to cut 2a.

For strain insulator string without the tower raised up, upper cross-arm and middle cross-arm are owing to will consider the safe distance of upper and lower surface discharge portion simultaneously, and adjustment sag is about 0.1m more smaller than design sag generally, and lower cross-arm adjustment sag generally gets design sag.

When strain insulator string raises up, as Fig. 5, for ensureing that cross-arm edge meets discharging gap distance value, adjustment sag should suitably increase, and the sag after general adjustment is larger than design load, and upper, middle and lower phase adjusted value becomes large successively, is shown in Table 1.

Table 1

(2) single-hop string

For strain tower single-hop string situation, on measurement drainage plate, hanging point is to the distance l jumping string upper conductor hanging hole ₁and l ₂(as shown in Figure 6), respectively by l ₁and l ₂substitution formula (2) or formula (3) are revised, and obtain the long L of the first wire jumper respectively ₁and the long L of the second wire jumper ₂, L=L ₁+ L ₂.The situation that strain insulator raises up is identical with without jumping the situation of going here and there, but sag adjustment value is than little without situation when jumping string, and sag adjustment rate is generally about 5% ~ 10%.

With without identical during jumping string, as f/l<0.23, the sag in the relational expression between line length and sag is revised according to formula (2).As f/l>0.23, the sag in the relational expression between line length and sag is revised according to formula (3).

(3) double jump string

For strain tower double jump string situation, on measurement drainage plate, hanging point is to the distance l jumping string upper conductor hanging hole ₁, l ₃and the distance l of the middle hanging hole of double bounce string ₂, as shown in Figure 7.The value l of both sides adjustment sag ₁, l ₃with single-hop string, identical without jumping string situation, l ₂corresponding middle sag does not need adjustment because two hanging points are contour.Respectively by l ₁and l ₃substitution formula (2) or formula (3) are revised, and obtain the long L of the first wire jumper respectively ₁and the long L of the 3rd wire jumper ₃, by l ₂substitute into relational expression (4) and obtain the long L of the second wire jumper ₂, L=L ₁+ L ₂+ L ₃.

With without identical during jumping string, as f/l<0.23, the sag in the relational expression between line length and sag is revised according to formula (2).As f/l>0.23, the sag in the relational expression between line length and sag is revised according to formula (3).

When 2, revising circuit corner, in strain tower single-hop string situation,

$l_1=\mathrm{MQ}=\sqrt{{\mathrm{MP}}^2+{\mathrm{QP}}^2-2\mathrm{MP}\&CenterDot;\mathrm{QP}\&CenterDot;\cos \frac{\&angle;\mathrm{MPN}}{2}}---\left(6\right)$

$l_2=\mathrm{NQ}=\sqrt{{\mathrm{NP}}^2+{\mathrm{QP}}^2-2\mathrm{NP}\&CenterDot;\mathrm{QP}\&CenterDot;\cos \frac{\&angle;\mathrm{MPN}}{2}}---\left(7\right)$

Wherein, M, N represent the hanging point of wire jumper on strain insulator respectively, and P is that front jumping insulator string hanging point position installed by wire jumper, and Q then represents the jumping insulator string hanging point position after wire jumper installation.The calculating of above-mentioned formula (6), (7) describes in detail as follows:

Because wire jumper is space curve, be that no matter how two hitch point locus change, and wire jumper and two hitch points are in same plane all the time, and circuit corner can not impact wire jumper precision without when jumping string at wire jumper.And for the situation of single-hop string and double jump string, circuit corner can make wire jumper depart from vertical plane formed by span, causes the change of hanging point locus, thus causes the measure error of hanging point chord length.Fig. 8 is the wire jumper tie point spatial position change relation schematic diagram after considering circuit corner, G point is cross-arm hitch point, M, N represent the hanging point of wire jumper on strain insulator respectively, and P is that front jumping insulator string hanging point position installed by wire jumper, and Q then represents the jumping insulator string hanging point position after wire jumper installation.

Because anterior-posterior plane GMP and GMQ installed by wire jumper, there is angle α between GNP and GNQ, be not positioned at same plane, the hanging point chord length causing measurement with install after actual hanging point chord length and inconsistent, i.e. MP ≠ MQ, NP ≠ NQ, length l there occurs deviation.

Following relationship is there is by known MP and the MQ of calculating:

$\mathrm{MQ}=\sqrt{{\mathrm{MP}}^2+{\mathrm{QP}}^2-2\mathrm{MP}\&CenterDot;\mathrm{QP}\&CenterDot;\cos \frac{\&angle;\mathrm{MPN}}{2}}---\left(6\right)$

$\mathrm{NQ}=\sqrt{{\mathrm{NP}}^2+{\mathrm{QP}}^2-2\mathrm{NP}\&CenterDot;\mathrm{QP}\&CenterDot;\cos \frac{\&angle;\mathrm{MPN}}{2}}---\left(7\right)$

In formula MP, NP be wire jumper install pre-test to drainage plate on hanging point go here and there the distance of upper conductor hanging hole to jumping.QP, ∠ MPN is calculated as follows:

$\mathrm{QP}=d\sqrt{2(1-\cos )\mathrm{\&alpha;}}---\left(8\right)$

$\&angle;\mathrm{MPN}=\arccos \frac{{\mathrm{MP}}^2+{\mathrm{NP}}^2-{\mathrm{MN}}^2}{2\mathrm{MP}\&CenterDot;\mathrm{NP}}---\left(9\right)$

Wherein, d is for jumping insulator string length, and MN is the distance on drainage plate two between hanging point.When considering that circuit corner affects, the value of what in line length computing formula, wire jumper chord length l should substitute into is MQ, NQ, instead of MP, NP.By multiple engineer applied, when drift angle α <5 °, circuit corner is very little on the impact of wire jumper precision, generally can ignore.

When above-mentioned sag correcting process and circuit corner correction, and after obtaining revised wire jumper length, the data measuring method of needs is as follows:

Aerological measurement data need the instrument prepared to have rope ladder and steel tape (error is little).Upper tower measurement size, unification will be placed on the large size side of circuit the zero point of steel ruler, and measuring position will be placed on hanging point center.For can directly measuring distance l, the vertical range f of hanging point line on cross-arm lower plane to wire jumper both sides drainage plate without the situation of jumping string ₀the available rope of measurement the upper hanging point of two drainage plates is connected, put a level gauge in cross-arm midpoint, measure the vertical range of level gauge and upper left sub-conductor two hanging point line.The situation of single-hop string, conveniently on tower, the operation of operating personnel first can measure l ₁and l ₁+ l ₂, then calculate l ₂.The situation of double jump string, first measures l ₁, l ₁+ l ₂and l ₁+ l ₂+ l ₃, then calculate l ₂and l ₃, measure form and see appendix.It is particularly to be noted that wire size will be determined accurately, in general four root wires, above the chord length measured value of two is more or less the same, below two be more or less the same, can tentatively determine that whether measured value accurate by this principle during measurement.

After calculating wire jumper secant line length, for avoiding measuring the error caused, the wire method of measuring needs specification: answer left hand to be pressed on wire by steel tape, right hand thumb is on tape measure, forefinger is under tape measure, smooth out with the fingers tape measure to be close to wire and to measure forward, measure simultaneously all to have needed before and after taker people by tape measure and wire by together with.

Draw print after wire jumper measures, secant on the spot, then can draw print by the installation site of conductor spacer according to designing requirement on 1 work song wire.After the drainage plate crimping of wire jumper two ends, wire jumper installed by upper tower, uses men hoisting coaster (Φ 15 nylon rope) to carry out wire lifting.Install in whole process at wire jumper, rope ladder be used as workmen's bearing tool, lower end marline catches hold of adjustment and jumping is gone here and there and the distance of drainage thread.By the picture print position installation interval rod of conductor spacer on 1 work song wire, and make it perpendicular to its excess-three root wire, greatly can shorten the engineering time like this.

Below strain tower wire jumper assembled manufacture craft is expanded:

Chord length between wire jumper two hanging point, the discrepancy in elevation are all generally measured by the upper tower of work high above the ground personnel, and efficiency is relatively low.If utilize total powerstation to measure the distance of point-to-point transmission on tower, then can save work high above the ground, both ensure that fail safe, also improve operating efficiency, measuring principle as shown in Figure 9.Suppose that distance AD is 2 distances tower needing measure, total powerstation is positioned at an O, point B, C are some A, D upright projection in the horizontal plane respectively, utilize total powerstation to measure distance OA, the OD of elevation angle ∠ AOB, ∠ DOC, horizontal angle ∠ BOC and total powerstation and measured point.Spatial relationship as shown in Figure 9, cross some A and make AE ∥ BC friendship DC in an E, then AE ﹦ BC, AE ⊥ DC, some A can survey with the discrepancy in elevation DE of some D.The length of AD can obtain by following formulae discovery.

$\mathrm{AD}=\sqrt{{\mathrm{AE}}^2+{\mathrm{DE}}^2}---\left(10\right)$

$\mathrm{AE}=\sqrt{{\mathrm{OB}}^2+{\mathrm{OC}}^2-2\mathrm{OB}\&CenterDot;\mathrm{OC}\&CenterDot;\cos \&angle;\mathrm{BOC}}---\left(11\right)$

Wherein, OB=OAcos ∠ AOB, OC=ODcos ∠ DOC.

The beneficial effect of the embodiment of the present invention is, strain tower of transmission line wire jumper installation method of the present invention, by carrying out crimping correction, sag correction and circuit corner correcting process, can measure wire jumper long accurately, improves the efficiency that wire jumper is installed.

Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiment of the utility model; and be not used in restriction protection range of the present utility model; all within spirit of the present utility model and principle, any amendment made, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.

Claims (4)

1. a strain tower of transmission line wire jumper installation method, is characterized in that, described method comprises:

Step 1: the high angular difference measuring wire jumper chord length l, wire jumper two hitch point and wire jumper adjustment sag f;

Step 2: obtain conductor compression jointing length correction coefficient a and separation adjusted value b, wherein, described correction factor a is the distance of the wire section after drainage tube center line intersection point to crimping, and the size of described adjusted value b is the half of wire pitch value;

Step 3: by described wire jumper chord length l, high angular difference the relational expression (1) that sag f and correction factor a substitutes between line length and sag generates the long L of wire jumper,

$L=l+\frac{{8f}^2}{3l}\stackrel{2}{\cos }\mathrm{\&phi;}-a\&PlusMinus;b---\left(1\right);$

Step 4: intercept wire according to the long L of wire jumper, carry out after crimping the described wire of intercepting on the ground tower is installed.

2. method according to claim 1, it is characterized in that, for strain tower without jumping string situation, after step 3, described method also comprises: by the sag in relational expression (1) according to formula (2) or formula (3) are revised below

As f/l<0.23, $f*=\frac{f}{l}f+(1-\frac{f}{l})f_{\max }---\left(2\right)$

As f/l>0.23, $f*=\frac{f}{l}f+(1-\frac{f}{l})f_{\min }---\left(3\right)$

Then the sag f in relational expression (4) is replaced to obtain the long L of wire jumper with correction value f*, wherein, f _maxsag permissible value is allowed, f for wire jumper is maximum _minsag permissible value is allowed for wire jumper is minimum;

3. method according to claim 2, is characterized in that, for strain tower single-hop string situation, on measurement drainage plate, hanging point is to the distance l jumping string upper conductor hanging hole ₁and l ₂, respectively by l ₁and l ₂substitution formula (2) or formula (3) are revised, and obtain the long L of the first wire jumper respectively ₁and the long L of the second wire jumper ₂, L=L ₁+ L ₂.

4. method according to claim 2, is characterized in that, for strain tower double jump string situation, on measurement drainage plate, hanging point is to the distance l jumping string upper conductor hanging hole ₁, l ₃and the distance l of the middle hanging hole of double bounce string ₂, respectively by l ₁and l ₃substitution formula (2) or formula (3) are revised, and obtain the long L of the first wire jumper respectively ₁and the long L of the 3rd wire jumper ₃, by l ₂substitute into described relational expression (4) and obtain the long L of the second wire jumper ₂, L=L ₁+ L ₂+ L ₃.