CN101929886A - Method for measuring icing mass of transmission line - Google Patents

Abstract

The invention discloses a method for measuring the icing mass of a transmission line. The method comprises the following steps of: measuring a line strain increment and the line temperature t of the transmission line, and measuring a wind speed v and a wind direction theta in the power transmission line environment by using a wind speed and direction sensor; calculating an icing thickness b of the transmission line through twice iteration; and calculating the icing mass of the whole transmission line according to the obtained icing thickness b of the transmission line and the influence of a division number of the transmission line. The method is more suitable for the actual condition of the field, namely the data measured by a strain sensor is actually the strain variation of the line other than the whole strain. Meanwhile, the data measured by the method is the strain variation of the line, so that the safety state of the transmission line can be reflected more intuitively.

Description

A kind of measuring method of icing mass of transmission line

Technical field

The invention belongs to transmission pressure icing monitoring technical field, more specifically say, relate to a kind of measuring method based on icing mass of transmission line.

Background technology

In transmission line of electricity, wire icing is very harmful to the safe operation of transmission line of electricity, and the accident of initiation comprises: inhomogeneous icing or do not deice accident the same period; The overload accident; Insulator ice sudden strain of a muscle accident; Icing is arranged lead and during for non-homogeneous icing, circuit is easily waved, and accident is waved in generation; Because the amplitude of waving is big, longer duration causes alternate flashover easily, damages parts such as ground wire, lead, gold utensil, causes major accidents such as line tripping power failure, wire breaking and tower falling.Once serious wire icing of transmission line accident can cause enormous economic loss, and has a strong impact on social life.Therefore, the wire icing of transmission line monitoring technology is promptly monitored the technology of transmission line of electricity upper conductor icing quality, for guaranteeing that the transmission line of electricity safe operation is extremely important.

In a single day icing takes place in transmission pressure, and transmission pressure weight increases, and suffered stress increases, and performance the most intuitively is exactly that the transmission pressure sag increases.Phenomenon is set out thus, derives a series of icing monitoring technology.Conclusion is got up, and mainly contains following five kinds at present:

1, sets up the icing research station, set up the observation station of special messenger's post, manual record weather information and icing situation at special area.The shortcoming of this method is, human factor is excessive, the cost height, and monitoring is difficult for.

2, inclination angle-sag is measured in real time, calculated circuit icing degree by the transmission line of electricity state equation.

3, video image acquisition equipment is installed on iron tower, and is beamed back view data, with artificial or computing machine thickness according to the video image analysis icing by wireless communication means.

4, be exactly the weight method that is commonly called as, by pulling force sensor is installed in electric transmission line isolator string position, the stressed variation of measuring the insulator chain position obtains the icing quality.

5, by measuring on the transmission pressure a bit or the strain of multiple spot, then in conjunction with the transmission line of electricity state equation, the icing mass change situation on the computing electric power line.

At the 5th kind of icing monitoring technology, the foundation that icing mass of transmission line calculates is the transmission line of electricity state equation., publication number disclosed as on January 6th, 2010 is the measuring method that CN 101620000A, name are called " computing method of ice concentration of transmission line " disclosed icing quality, may further comprise the steps for: (1) obtains fixedly conductor temperature and the elastic strain amount in the span of transmission line of electricity, obtains the fixedly overall strain amount in the span of transmission line of electricity according to conductor temperature and elastic strain amount; (2) according to the overall strain amount obtain transmission line of electricity fixedly the lead in the span than carrying, and with lead than carry with transmission line of electricity fixedly the lead self in the span than year comparing; If lead is than carrying greater than lead self than carrying, computing electric power line is the interior additional load of span fixedly; Obtain the fixedly ice cover in the span of transmission line of electricity according to additional load.In computation process, these class methods also need to monitor wind speed and angle of wind deflection, so that reject Influences on Wind Velocity in net result.

The measuring method of this icing quality does not consider in the actual measurement process that the total elastic strain amount of transmission pressure is difficult to direct measurement.Because transmission pressure is installed prior to strain gauge means, before strain gauge means is installed, initial stress and initial strain are just arranged on the transmission pressure.Generally speaking, the actual measurement of strain monitoring device be the variable quantity of lead strain, i.e. elongated under the factor actings in conjunction such as lead Yin Wendu, icing, wind load or shorten.

Summary of the invention

The objective of the invention is to overcome the deficiencies in the prior art, propose a kind of measuring method of the icing mass of transmission line that does not calculate with the overall strain amount.

For achieving the above object, the measuring method of icing mass of transmission line of the present invention is characterized in that, may further comprise the steps:

(1), strain transducer measures transmission pressure and obtains the lead strain increment, carries out filtering then, obtains lead strain steady-state component ξ wherein;

(2), the temperature sensor measurement transmission pressure obtains conductor temperature t, then, calculates the strain increment Δ ξ that transmission pressure produces because of temperature change _t=a (t-t ₀), wherein, α is a temperature expansion coefficient, t ₀Be initial transmission line of electricity temperature; According to the lead strain steady-state component ξ that step (1) obtains, calculate dependent variable Δ ξ=ξ-Δ ξ that transmission pressure produces because of icing and wind load _t

(3), wind speed wind direction sensor measure transmission pressure environment of living in down wind speed v and wind direction and the calm situation of transmission pressure under the angle theta on plane, place, then according to load reckoner in the transmission line of electricity designing technique standard, obtain working as ground reference blast standard value W ₀, blast nonuniformity coefficient a ₁, lead bodily form coefficient μ _Sc, height variation coefficient of wind pressure μ _z, wind direction and traverse shaft to the variation factor μ of the blast box haul that causes of angle theta _θ

(4), calculate the transmission pressure ice covering thickness:

A, initial assignment

Make transmission pressure comprehensively than carrying γ ₁=γ ₀, the ratio of icing carries and is γ ₂=0, the ratio of wind carries and is γ in the surface level ₃=0, the stress σ of the transmission pressure minimum point in the windage yaw plane ₁=σ ₀, angle of wind deflection η=0, transmission pressure ice covering thickness b=0; Wherein, γ ₀Be carrying of transmission pressure, σ from anharmonic ratio ₀The horizontal stress of strain transducer minimum point constantly is installed for transmission pressure;

B, according to line length formula, mean stress equation, calculate the transmission pressure line length L under the ice coating state not ₁With mean stress σ _Av1:

${\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="HSA00000176155600011.png"\; state="\{\{state\}\}">L</figure-callout>}}_1=\frac{l}{\cos \mathrm{\&beta;}}+\frac{{{\mathrm{\&gamma;}}_0}^2{l}^3}{24{{\mathrm{\&sigma;}}_0}^2}\cos \mathrm{\&beta;};$

${\mathrm{\&sigma;}}_{\mathrm{av}1}=\frac{{\mathrm{\&sigma;}}_0}{2L_1}[l+\frac{{{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="HSA00000176155600011.png"\; state="\{\{state\}\}">L</figure-callout>}}_1}^2+h^2}{\sqrt{{{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="HSA00000176155600011.png"\; state="\{\{state\}\}">L</figure-callout>}}_1}^2-h^2}}\mathrm{ch}\frac{{\mathrm{\&gamma;}}_{0}l}{2{\mathrm{\&sigma;}}_0}]$

Wherein, l is a span, and β is a height difference angle, and h is the discrepancy in elevation;

C, iterative computation ice covering thickness are the horizontal stress σ of the transmission pressure minimum point under b and the calm situation _B0Ratio after the transmission pressure icing carries and is γ ₄=γ ₀+ γ ₂, wherein, γ ₂=0.027728b (D+b)/A, D are the transmission pressure external diameter, and A is the transmission pressure cross-sectional area; First iteration establishes that the horizontal stress of transmission pressure minimum point is σ after the icing _B0=σ ₀

C1, with the horizontal stress σ of transmission pressure minimum point after the icing _B0, substitution line length formula is obtained the line length L of transmission pressure behind the icing ₂:

$L_2=\frac{l}{\cos \mathrm{\&beta;}}+\frac{{{\mathrm{\&gamma;}}_4}^2{l}^3}{24{{\mathrm{\&sigma;}}_{b0}}^2}\cos \mathrm{\&beta;}$

C2, with the line length L of transmission pressure behind the icing ₂The mean stress equation of substitution lead is obtained transmission pressure mean stress σ _Av2:

${\mathrm{\&sigma;}}_{\mathrm{av}2}=\frac{{\mathrm{\&sigma;}}_{b0}}{2L_2}[l+\frac{{L_2}^2+h^2}{\sqrt{{L_2}^2-h^2}}\mathrm{ch}\frac{{\mathrm{\&gamma;}}_{4}l}{2{\mathrm{\&sigma;}}_{b0}}]$

C3, will be not line length L under the ice coating state ₁With mean stress σ _Av1, transmission pressure mean stress σ behind the icing _Av2The basic status equation of substitution pole line can be tried to achieve new line length L ' ₂:

$L_2^{\&prime;}=\frac{L_1[1-\frac{{\mathrm{\&sigma;}}_{\mathrm{av}1}}{E}-\mathrm{\&alpha;}(t_1-t_0)]}{1-\frac{{\mathrm{\&sigma;}}_{\mathrm{av}2}}{E}-\mathrm{\&alpha;}(t-t_0)}$

Wherein, E is the elasticity coefficient of transmission pressure, t ₁For transmission pressure is installed strain transducer temperature constantly;

The line length L ' that c4, comparison step c3 newly try to achieve ₂The line length L of transmission pressure behind the icing of trying to achieve with step c2 ₂If both differences are greater than setting difference ε ₁, then:

The line length L ' that step c3 is newly tried to achieve then ₂Substitution line length formula obtains the horizontal stress σ of transmission pressure minimum point _B0:

${\mathrm{\&sigma;}}_{b0}=\sqrt{\frac{{{\mathrm{\&gamma;}}_4}^2{l}^3\cos \mathrm{\&beta;}}{24(L_2^{\&prime;}-\frac{l}{\cos \mathrm{\&beta;}})}}$

Horizontal stress σ with the transmission pressure minimum point _B0Substitution step c1, repeating step c1-c3, the line length L ' that newly tries to achieve up to step c3 ₂The line length L of transmission pressure behind the icing of trying to achieve with step c2 ₂Both differences are smaller or equal to setting difference ε ₁, and export the icing horizontal stress σ of transmission pressure minimum point afterwards _B0

D, in the windage yaw plane, calculate wind load γ successively ₃, comprehensively than carrying γ ₁, transmission pressure angle of wind deflection η, the horizontal stress σ ' of span l ', discrepancy in elevation h ', height difference angle β ', minimum point ₀, line length L ₃, obtain strain transducer position x ₀Stress σ ' _X0:

γ ₃＝W ₀(D+2b)a ₁μ _scμ _zμ _θ/A×10 ^-3

${\mathrm{\&gamma;}}_1=\sqrt{{({\mathrm{\&gamma;}}_0+{\mathrm{\&gamma;}}_2)}^2+{{\mathrm{\&gamma;}}_3}^2}$

$\mathrm{\&eta;}=\arctan \left(\frac{{\mathrm{\&gamma;}}_3}{{\mathrm{\&gamma;}}_1}\right)$

$l^{\&prime;}=l\&times;\sqrt{1+{(\tan \mathrm{\&beta;}\&times;\sin \mathrm{\&eta;})}^2}$

h′＝hcosη

${{\mathrm{\&sigma;}}_0}^{\&prime;}={\mathrm{\&sigma;}}_{b0}\&times;\sqrt{1+{(\tan \mathrm{\&beta;}\&times;\sin \mathrm{\&eta;})}^2}$

$\cos {\mathrm{\&beta;}}^{\&prime;}=\cos \mathrm{\&beta;}\&times;\sqrt{1+{(\tan \mathrm{\&beta;}\&times;\sin \mathrm{\&eta;})}^2}$

sinβ′＝sinβ×cosη

$L_3=\frac{l^{\&prime;}}{\cos {\mathrm{\&beta;}}^{\&prime;}}+\frac{{{\mathrm{\&gamma;}}_1}^2{l}^{\&prime;3}}{24{\mathrm{\&sigma;}}_0^{\&prime;2}}\cos {\mathrm{\&beta;}}^{\&prime;}$

${\mathrm{\&sigma;}}_{x0}^{\&prime;}=\frac{{{\mathrm{\&sigma;}}_0}^{\&prime;}}{\cos {\mathrm{\&beta;}}^{\&prime;}}+{\mathrm{\&gamma;}}_1[\frac{{\mathrm{\&gamma;}}_1{(l^{\&prime;}-2x_0)}^2}{8{{\mathrm{\&sigma;}}_0}^{\&prime;}\cos {\mathrm{\&beta;}}^{\&prime;}}-\frac{(l^{\&prime;}-2x_0)}{2}\tan {\mathrm{\&beta;}}^{\&prime;}]$

Wherein, x ₀It is the horizontal coordinate of the relative iron tower of strain transducer;

Following equation is used in e, utilization, obtains the strain increment Δ ξ of transmission pressure ₁:

$\mathrm{E\&Delta;}{\mathrm{\&xi;}}_1=\frac{{{\mathrm{\&sigma;}}_0}^{\&prime;}}{\cos {\mathrm{\&beta;}}^{\&prime;}}+{\mathrm{\&gamma;}}_1[\frac{{\mathrm{\&gamma;}}_1{(l^{\&prime;}-2x_0)}^2}{8{{\mathrm{\&sigma;}}_0}^{\&prime;}\cos {\mathrm{\&beta;}}^{\&prime;}}-\frac{(l^{\&prime;}-2x_0)}{2}\tan {\mathrm{\&beta;}}^{\&prime;}]-\frac{{\mathrm{\&sigma;}}_0}{\cos \mathrm{\&beta;}}-{\mathrm{\&gamma;}}_0[\frac{{\mathrm{\&gamma;}}_0{(l-2x_0)}^2}{8{\mathrm{\&sigma;}}_0\cos \mathrm{\&beta;}}-\frac{(l-2x_0)}{2}\mathrm{tg\&beta;}]$

Then with the transmission pressure strain increment Δ ξ that obtains ₁The transmission pressure strain increment Δ ξ measured with strain transducer compares, if both differences are less than setting value ε ₂, then computation process finishes, output ice covering thickness b; Otherwise, then upgrade ice covering thickness b as follows: if Δ ξ ₁Greater than Δ ξ then b reduce k ₁If b is Δ ξ ₁Less than Δ ξ, then b increases k ₂B, wherein, k ₁, k ₂Be the step-length coefficient, return step c then;

(5), according to obtaining electric power line ice-covering thickness b, and consider the influence of transmission pressure division number purpose, calculate the icing quality on the whole piece transmission pressure.

Goal of the invention of the present invention is achieved in that

The present invention is by wind speed v and wind direction θ under the lead strain increment, conductor temperature t and the wind speed wind direction sensor measurement transmission pressure environment of living in that measure transmission pressure, then by double iteration, calculate transmission pressure ice covering thickness b, then according to obtaining electric power line ice-covering thickness b, and consider the influence of transmission pressure division number purpose, calculate the icing quality on the whole piece transmission pressure.This method meets on-the-spot actual conditions more, and promptly the measured data of strain transducer are actually the strain variation amount of lead, rather than total dependent variable.Simultaneously, this method institute data monitored is the strain variation of lead, can reflect the safe condition of transmission line of electricity more intuitively.

Description of drawings

Fig. 1 is the applied transmission line of electricity synoptic diagram of the measuring method of icing mass of transmission line of the present invention;

Fig. 2 is the process flow diagram under a kind of embodiment of measuring method of icing mass of transmission line of the present invention;

Embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present invention is described, so that those skilled in the art understands the present invention better.What need point out especially is that in the following description, when perhaps the detailed description of known function and design can desalinate main contents of the present invention, these were described in here and will be left in the basket.

Fig. 1 is the applied transmission line of electricity synoptic diagram of the measuring method of icing mass of transmission line of the present invention

As shown in Figure 1, under the calm situation, strain transducer, temperature sensor are positioned at the C place of transmission pressure, and the horizontal coordinate of its relative low spot iron tower is x ₀

Wind speed wind direction sensor is positioned at the low spot iron tower, the angle theta on plane, place under the wind speed v under the measurement transmission pressure environment of living in and wind direction and the calm situation of transmission pressure.

Under the blowing of wind, plane, transmission pressure place from become perpendicular to ground with calm situation under the plane, place form an angle i.e. angle of wind deflection η.

Strain transducer is measured transmission pressure and is obtained the lead strain increment, carries out filtering then, obtains lead strain steady-state component ξ wherein; The temperature sensor measurement transmission pressure obtains conductor temperature t, then, calculates the strain increment Δ ξ that transmission pressure produces because of temperature change _t=a (t-t ₀), wherein, α is a temperature expansion coefficient, t ₀Be initial transmission line of electricity temperature; The lead strain steady-state component ξ that obtains according to step (1) calculates dependent variable Δ ξ=ξ-Δ ξ that transmission pressure produces because of icing and wind load _t

In addition, l is a span, and β is a height difference angle, and h is the discrepancy in elevation, is the geometric parameter of transmission line of electricity.In Fig. 1, as initial point, set up X, Y, Z three-dimensional coordinate with the low spot iron tower, so that understand the implication of each parameter.

The transmission pressure minimum point is a transmission pressure A point after the icing

Embodiment 1

Fig. 2 is the process flow diagram under a kind of embodiment of measuring method of icing mass of transmission line of the present invention

In the present embodiment, as shown in Figure 2, in the present embodiment, transmission line of electricity designing technique standard described in the step (3) is the chief editor of East China Electric Power Design Institute of State Power Corporation of China, " 110-500kV aerial power transmission line designing technique rules " (DL/T 5092-1999), Chinese Research Institute for Building Sciences, " loading code for design of building structures " (GBJ9-1987), 1987.Certainly, in specific implementation process, can also select other load reckoner,

In the present embodiment, initial transmission line of electricity temperature t ₀, the temperature during for the manufacturing lead.

In the present embodiment, the described setting difference of step c3 ε ₁Be 0.001m.

In the present embodiment, the described setting difference of step e ε ₂Be 0.0000001, k ₁=0.005, k ₂=0.01.

Although above the illustrative embodiment of the present invention is described; so that the technician of present technique neck understands the present invention; but should be clear; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various variations appended claim limit and the spirit and scope of the present invention determined in, these variations are conspicuous, all utilize innovation and creation that the present invention conceives all at the row of protection.

Claims (3)

1. the measuring method of an icing mass of transmission line is characterized in that, may further comprise the steps:

(1), strain transducer measures transmission pressure and obtains the lead strain increment, carries out filtering then, obtains lead strain steady-state component ξ wherein;

(2), the temperature sensor measurement transmission pressure obtains conductor temperature t, then, calculates the strain increment Δ ξ that transmission pressure produces because of temperature change _t=a (t-t ₀), wherein, α is a temperature expansion coefficient, t ₀Be initial transmission line of electricity temperature; According to the lead strain steady-state component ξ that step (1) obtains, calculate dependent variable Δ ξ=ξ-Δ ξ that transmission pressure produces because of icing and wind load _t

(3), wind speed wind direction sensor measure transmission pressure environment of living in down wind speed v and wind direction and the calm situation of transmission pressure under the angle theta on plane, place, then according to load reckoner in the transmission line of electricity designing technique standard, obtain working as ground reference blast standard value W ₀, blast nonuniformity coefficient a ₁, lead bodily form coefficient μ _Sc, height variation coefficient of wind pressure μ _z, wind direction and traverse shaft to the variation factor μ of the blast box haul that causes of angle theta _θ

(4), calculate the transmission pressure ice covering thickness:

A, initial assignment

Make transmission pressure comprehensively than carrying γ ₁=γ ₀, the ratio of icing carries and is γ ₂=0, the ratio of wind carries and is γ in the surface level ₃=0, the stress σ of the transmission pressure minimum point in the windage yaw plane ₁=σ ₀, angle of wind deflection η=0, transmission pressure ice covering thickness b=0; Wherein, γ ₀Be carrying of transmission pressure, σ from anharmonic ratio ₀The horizontal stress of strain transducer minimum point constantly is installed for transmission pressure;

B, according to line length formula, mean stress equation, calculate the transmission pressure line length L under the ice coating state not ₁With mean stress σ _Av1:

$L_1=\frac{l}{\cos \mathrm{\&beta;}}+\frac{{{\mathrm{\&gamma;}}_0}^2{l}^3}{24{{\mathrm{\&sigma;}}_0}^2}\cos \mathrm{\&beta;};$

${\mathrm{\&sigma;}}_{\mathrm{av}1}=\frac{{\mathrm{\&sigma;}}_0}{2L_1}[l+\frac{{L_1}^2+h^2}{\sqrt{{L_1}^2-h^2}}\mathrm{ch}\frac{{\mathrm{\&gamma;}}_{0}l}{2{\mathrm{\&sigma;}}_0}]$

Wherein, l is a span, and β is a height difference angle, and h is the discrepancy in elevation.

C, iterative computation ice covering thickness are the horizontal stress σ of the transmission pressure minimum point under b and the calm situation _B0Ratio after the transmission pressure icing carries and is γ ₄=γ ₀+ γ ₂, wherein, γ ₂=0.027728b (D+b)/A, D are the transmission pressure external diameter, and A is the transmission pressure cross-sectional area; First iteration establishes that the horizontal stress of transmission pressure minimum point is σ after the icing _B0=σ ₀

C1, with the horizontal stress σ of transmission pressure minimum point after the icing _B0, substitution line length formula is obtained the line length L of transmission pressure behind the icing ₂:

$L_2=\frac{l}{\cos \mathrm{\&beta;}}+\frac{{{\mathrm{\&gamma;}}_4}^2{l}^3}{24{{\mathrm{\&sigma;}}_{b0}}^2}\cos \mathrm{\&beta;}$

C2, with the line length L of transmission pressure behind the icing ₂The mean stress equation of substitution lead is obtained transmission pressure mean stress σ _Av2:

${\mathrm{\&sigma;}}_{\mathrm{av}2}=\frac{{\mathrm{\&sigma;}}_{b0}}{2L_2}[l+\frac{{L_2}^2+h^2}{\sqrt{{L_2}^2-h^2}}\mathrm{ch}\frac{{\mathrm{\&gamma;}}_{4}l}{2{\mathrm{\&sigma;}}_{b0}}]$

C3, will be not line length L under the ice coating state ₁With mean stress σ _Av1, transmission pressure mean stress σ behind the icing _Av2The basic status equation of substitution pole line can be tried to achieve new line length L ' ₂:

$L_2^{\&prime;}=\frac{L_1[1-\frac{{\mathrm{\&sigma;}}_{\mathrm{av}1}}{E}-\mathrm{\&alpha;}(t_1-t_0)]}{1-\frac{{\mathrm{\&sigma;}}_{\mathrm{av}2}}{E}-\mathrm{\&alpha;}(t-t_0)}$

Wherein, E is the elasticity coefficient of transmission pressure, t ₁For transmission pressure is installed strain transducer temperature constantly;

The line length L ' that c4, comparison step c3 newly try to achieve ₂The line length L of transmission pressure behind the icing of trying to achieve with step c2 ₂If both differences are greater than setting difference ε ₁, then:

The line length L ' that step c3 is newly tried to achieve ₂Substitution line length formula obtains the horizontal stress σ of transmission pressure minimum point _B0:

${\mathrm{\&sigma;}}_{b0}=\sqrt{\frac{{{\mathrm{\&gamma;}}_4}^2{l}^3\cos \mathrm{\&beta;}}{24(L_2^{\&prime;}-\frac{l}{\cos \mathrm{\&beta;}})}}$

Horizontal stress σ with the transmission pressure minimum point _B0Substitution step c1, repeating step c1-c3, the line length L ' that newly tries to achieve up to step c3 ₂The line length L of transmission pressure behind the icing of trying to achieve with step c2 ₂Both differences are smaller or equal to setting difference ε ₁, and export the icing horizontal stress σ of transmission pressure minimum point afterwards _B0

D, in the windage yaw plane, calculate wind load γ successively ₃, comprehensively than carrying γ ₁, transmission pressure angle of wind deflection η, the horizontal stress σ of span l ', discrepancy in elevation h ', height difference angle β ', minimum point ₀', line length L ₃, obtain strain transducer position x ₀Stress σ ' _X0:

γ ₃＝W ₀(D+2b)a ₁μ _scμ _zμ _θ/A×10 ^-3

${\mathrm{\&gamma;}}_1=\sqrt{{({\mathrm{\&gamma;}}_0+{\mathrm{\&gamma;}}_2)}^2+{{\mathrm{\&gamma;}}_3}^2}$

$\mathrm{\&eta;}=\arctan \left(\frac{{\mathrm{\&gamma;}}_3}{{\mathrm{\&gamma;}}_1}\right)$

$l^{\&prime;}=l\&times;\sqrt{1+{(\tan \mathrm{\&beta;}\&times;\sin \mathrm{\&eta;})}^2}$

h′＝hcosη

${{\mathrm{\&sigma;}}_0}^{\&prime;}={\mathrm{\&sigma;}}_{b0}\&times;\sqrt{1+{(\tan \mathrm{\&beta;}\&times;\sin \mathrm{\&eta;})}^2}$

$\cos {\mathrm{\&beta;}}^{\&prime;}=\cos \mathrm{\&beta;}\&times;\sqrt{1+{(\tan \mathrm{\&beta;}\&times;\sin \mathrm{\&eta;})}^2}$

sinβ′＝sinβ×cosη

$L_3=\frac{l^{\&prime;}}{\cos {\mathrm{\&beta;}}^{\&prime;}}+\frac{{{\mathrm{\&gamma;}}_1}^2{l}^{\&prime;3}}{24{\mathrm{\&sigma;}}_0^{\&prime;2}}\cos {\mathrm{\&beta;}}^{\&prime;}$

${\mathrm{\&sigma;}}_{x0}^{\&prime;}=\frac{{{\mathrm{\&sigma;}}_0}^{\&prime;}}{\cos {\mathrm{\&beta;}}^{\&prime;}}+{\mathrm{\&gamma;}}_1[\frac{{\mathrm{\&gamma;}}_1{(l^{\&prime;}-2x_0)}^2}{8{{\mathrm{\&sigma;}}_0}^{\&prime;}\cos {\mathrm{\&beta;}}^{\&prime;}}-\frac{(l^{\&prime;}-2x_0)}{2}\tan {\mathrm{\&beta;}}^{\&prime;}]$

Wherein, x ₀It is the horizontal coordinate of the relative iron tower of strain transducer;

Following equation is used in e, utilization, obtains the strain increment Δ ξ of transmission pressure ₁:

$\mathrm{E\&Delta;}{\mathrm{\&xi;}}_1=\frac{{{\mathrm{\&sigma;}}_0}^{\&prime;}}{\cos {\mathrm{\&beta;}}^{\&prime;}}+{\mathrm{\&gamma;}}_1[\frac{{\mathrm{\&gamma;}}_1{(l^{\&prime;}-2x_0)}^2}{8{{\mathrm{\&sigma;}}_0}^{\&prime;}\cos {\mathrm{\&beta;}}^{\&prime;}}-\frac{(l^{\&prime;}-2x_0)}{2}\tan {\mathrm{\&beta;}}^{\&prime;}]-\frac{{\mathrm{\&sigma;}}_0}{\cos \mathrm{\&beta;}}-{\mathrm{\&gamma;}}_0[\frac{{\mathrm{\&gamma;}}_0{(l-2x_0)}^2}{8{\mathrm{\&sigma;}}_0\cos \mathrm{\&beta;}}-\frac{(l-2x_0)}{2}\mathrm{tg\&beta;}]$

Then with the transmission pressure strain increment Δ ξ that obtains ₁The transmission pressure strain increment Δ ξ measured with strain transducer compares, if both differences are less than setting value ε ₂, then computation process finishes, output ice covering thickness b; Otherwise, then upgrade ice covering thickness b as follows: if Δ ξ ₁Greater than Δ ξ then b reduce k ₁If b is Δ ξ ₁Less than Δ ξ, then b increases k ₂B, wherein, k ₁, k ₂Be the step-length coefficient, return step c then;

(5), according to obtaining electric power line ice-covering thickness b, and consider the influence of transmission pressure division number purpose, calculate the icing quality on the whole piece transmission pressure.

2. the measuring method of icing mass of transmission line according to claim 1 is characterized in that, the described setting difference of step c3 ε ₁Be 0.001m.

3. the measuring method of icing mass of transmission line according to claim 1 is characterized in that, the described setting difference of step e ε ₂Be 0.0000001, k ₁=0.005, k ₂=0.01.

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