CN102095449A - Method for alarming dancing of overhead transmission circuit - Google Patents

Abstract

The invention discloses a method for alarming the dancing of an overhead transmission circuit. The method comprises the following steps of: (S1) monitoring the dynamic load change condition of an iced lead and measuring the data of a vertical load and a horizontal load in at least one period; (S2) estimating a lead dancing amplitude A according to the change of the horizontal dynamic load; (S3) calculating a maximum dynamic load and a minimum electric gap according to the dynamic load measurement of lead dancing in the step (S1) and the lead dancing amplitude A estimated in the step (2); (S4) calculating the design load and calculating a design electric gap according to the design parameters of an overhang insulator strings, fittings, overhead transmission line leads and a linear tower; and (S5) comparing the maximum dynamic load calculated in the step (S3) with the design load calculated in the step (S4) or comparing the minimum electric gap calculated in the (S3) with the design electric gap calculated in the step (S4) for judging alarm and returning to the step (S1). The invention has the advantages of good line safety and high accuracy.

Description

A kind of overhead transmission line galloping method for early warning

Technical field

The present invention relates to the overhead transmission line on-line monitoring field of power domain, relate in particular to a kind of overhead transmission line galloping method for early warning.

Background technology

Overhead transmission line galloping be the low frequency that produces of ice coating wire (0.1～3Hz), the autovibration of large amplitude (diameter of wire 5～300 times), its formation depends primarily on three aspects: icing, wind speed and direction, line construction and parameter.

The harm of conductor galloping can be divided into two classes: a class is alternate flashover or the relative aerial earth wire discharge accident that the conductor galloping amplitude causes greatly; The another kind of big dynamic loads that produces when being conductor galloping is to insulator, gold utensil, lead and the shaft tower destruction that impacts, serious power grid accident such as cause that local damage even shaft tower collapse.

At present, the transmission line galloping monitoring and pre-alarming method mainly contains two kinds: a kind of is that track is waved in the graphical analysis that utilizes camera to take when waving, and qualitatively judges the amplitude of waving; Another kind is that a plurality of sensor acquisition of layout along the line are waved parameter, and match conductor galloping track calculates and waves amplitude, frequency and half-wave number, comes the early warning conductor galloping from the aspect of amplitude (i.e. height).Obviously, this that lacks the power that changes from rule in the prior art comes the method for early warning conductor galloping on the one hand.

Though existing pulling force sensor (as fiber Bragg grating strain sensor) is applied to monitor load increase situations such as powerline ice-covering, no matter but its acquisition mode is whether to wave acquisition interval and acquisition time is fixed, collection capacity is not directly related with overhead transmission line galloping, monitoring result can not reflect fully that the dynamic loads of conductor galloping changes, the dynamic force that monitors does not have concrete realization fault pre-alarming mode yet, there is not the implementation of waving amplitude based on the change calculations of dynamic force yet, therefore can't accurately analyze the stressing conditions of transmission line of electricity and shaft tower in the process of waving at present, more can't analysis-by-synthesis wave parameter to realize the purpose of the above-mentioned two class transmission line galloping accidents of early warning.

Summary of the invention

The objective of the invention is to overcome above-mentioned deficiency, a kind of overhead transmission line galloping method for early warning is provided, it has solved present method for early warning has only the monitoring of amplitude aspect and does not have transmission line of electricity dynamic loads variation monitoring, with lack by comprehensive magnitude and dynamic loads variation monitoring early warning conductor galloping as a result, cause problems such as lead, insulator, gold utensil and shaft tower etc. may damage, can effectively avoid the generation of the accident of waving, have that security is good, advantage of high accuracy.

The objective of the invention is to be achieved through the following technical solutions: a kind of overhead transmission line galloping method for early warning comprises the steps:

S1, monitoring ice coating wire dynamic loads situation of change are measured vertical load and horizontal loading data at least one cycle;

S2, estimate conductor galloping amplitude A according to the horizontal dynamic loads change;

S3, according to the dynamic loads of the conductor galloping among the step S1 measure and step S2 in conductor galloping amplitude A, carry out maximum dynamic load and minimum electric clearance and calculate;

S4, according to the design parameter of suspension insulator and gold utensil, overhead transmission line conductor and tangent tower, carry out that design load is calculated and the design electric clearance calculates;

S5, design load among maximum dynamic load among the step S3 and the step S4 is compared, perhaps minimum electric clearance among the step S3 and the design electric clearance among the step S4 are compared, carry out early warning and judge, return step S1.

To better implement the present invention, described step S1 specifically is meant:

When circuit equivalence ice covering thickness h＞0, the conductor vibration sensor is fixed on the lead, by conductor vibration sensor measurement conductor galloping frequency v, then wave T=1/v cycle length;

The wire tension sensor is fixed on conductive line surfaces, by the circuit horizontal loading F at least one period T of wire tension sensor continuous coverage _h(t) delta data;

The insulator chain pulling force sensor is installed in the insulator chain upper end, by the circuit vertical load F at least one period T of insulator chain pulling force sensor continuous coverage _v(t) delta data.

Preferably, described wire tension sensor and insulator chain pulling force sensor are resistance strain type sensor or fiber Bragg grating strain sensor.

Preferably, described S2 specifically may further comprise the steps:

S2.1 calculates the static line length S of ice coating wire _s:

By following obtain wave before the ice coating wire off-position move f _s(x):

f _s(x)＝xtanβ-γx(l-x)/(2F ₀cosβ)

In the formula, γ is the ice coating wire linear load, and β is a height difference angle, and l is a span, F ₀Be ice coating wire quiescent levels load;

Obtain F by following formula ₀:

$F_0=\sqrt{\frac{{\mathrm{\&gamma;}}^2{\mathrm{<figure-callout\; id="3"\; label="l"\; filenames="HSA00000326827900012.png"\; state="\{\{state\}\}">l</figure-callout>}}^3\cos \mathrm{\&beta;}}{24(S_s-l/\cos \mathrm{\&beta;})}}$

In the formula, S _sBe the static line length of ice coating wire, S _sCalculate by following formula:

$S_s={\&Integral;}_0^{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HSA00000326827900012.png"\; state="\{\{state\}\}">l</figure-callout>}}\sqrt{1+[\frac{{\mathrm{df}}_s\left(x\right)}{\mathrm{dx}}{]}^2}\mathrm{dx}$

S2.2 calculates conductor galloping line length S _g:

Conductor galloping displacement f _g(x, t) ask for by following formula:

f _g(x，t)＝A?sin(nπx/l)sinwt

In the formula, A is the conductor galloping amplitude, and n is for waving the half-wave number, and w is for waving angular frequency, w=2 π v;

(x t) is then to wave the displacement f of lead

f(x，t)＝f _s(x)+f _g(x，t)

Conductor galloping line length S _gFor

$S_g={\&Integral;}_0^{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HSA00000326827900012.png"\; state="\{\{state\}\}">l</figure-callout>}}\sqrt{1+{\left[\frac{{\&PartialD;f}_g(x,t)}{\&PartialD;x}\right]}^2}\mathrm{dx}$

S2.3 obtains maximum and waves amplitude A _Max:

When waving, the wire tension sensor that is fixed on conductive line surfaces is surveyed horizontal loading F _h(t) with ice coating wire quiescent levels load F ₀Satisfy Hooke's law

F _h(t)-F ₀＝ΔF＝kΔS/S _s＝k(S _g-S _s)/S _s

In the formula, k=EA _r, E is the lead synthetical elastic modulus, A _rFor conductive wire cross-section is amassed;

With line length computing formula substitution following formula:

F when 1. n is even number _h(t)-F ₀≈ n ²π ²KA ²Sin ²Wt/ (4l)

F when 2. n is odd number _h(t)-F ₀≈ n ²π ²KA ²Sin ²Wt/ (4l)-2 γ klAsinwt/ (n π F ₀Cos β)

＝n ²π ²kA ²sin ²wt/(4l)-16dkAsinwt/(nπl)

In the formula, d is a line-sag;

Go out conductor galloping amplitude A by lead horizontal loading maximum value calculation

F _max＝max(F _h(t))

In the formula, it is relevant that A and half-wave are counted the n value, waves amplitude after general n surpasses 5 and do not constitute a threat to, and therefore calculates n and be respectively 1 to 4 the amplitude of waving; Because actual measurement is waved amplitude and is no more than 12 meters, if therefore maximum is waved amplitude greater than 12 meters then get maximum to wave amplitude be 12 meters, if maximum wave amplitude less than directly get maximal value and wave amplitude A as maximum _Max

Preferably, described step S3 carries out maximum dynamic load and minimum electric clearance calculates, and specifically is meant:

Described maximum dynamic load comprises maximum perpendicular load F _VmaxWith maximum horizontal load F _Max, wherein,

F _vmax＝max(F _v(t))

F _max＝max(F _h(t))

Minimum electric clearance comprises the minimum electric clearance of mutually minimum relatively electric clearance and relative ground wire, wherein, and mutually minimum relatively electric clearance D _P-pminWith the minimum electric clearance D of relative ground wire _P-gminObtain by following formula respectively:

D _p-pmin＝D _p-p-2A _max

D _p-gmin＝D _p-g-A _max

In the formula, D _P-pBe vertical phase spacing, D _P-gBe vertically opposite ground linear distance.

Preferably, the design parameter of suspension insulator and gold utensil, overhead transmission line conductor and tangent tower comprises the dynamo-electric failing load F of insulator among the described step S4 _IAnd safety coefficient S _FI, gold utensil physical strength F _HAnd safety coefficient S _FH, lead calculating pull-off force F _CAnd safety coefficient S _FC, lead deadweight m, lead design ice covering thickness h _mWith shaft tower vertical span l _V

The design load of carrying out among the described step S4 is calculated and is comprised that the design vertical load calculates and the design level load calculates; Wherein, the design vertical load is calculated as

F _v0＝min(F _T0，F _I0，F _H0)

F _T0＝n ₁γ _ml _V

F _I0＝F _I/S _fI

F _H0＝F _H/S _fH

In the formula, n ₁Be lead division number, γ _mBe the lead linear load under the design ice thickness, γ _mUtilize m and h _mCalculate;

The design level load is calculated as

F _h0＝F _C/S _fC

The design electric clearance comprises relative phase minimal design electric clearance and relative ground wire minimal design electric clearance, and described relative phase minimal design electric clearance specifically is meant the alternate lead minimum air void d that does not take place to discharge _P-p, described relative ground wire minimal design electric clearance is meant the minimum air void d of the relative ground wire that does not take place to discharge _P-g

Preferably, among the described step S5 design load among maximum dynamic load among the step S3 and the step S4 is compared, perhaps minimum electric clearance among the step S3 and the design electric clearance among the step S4 is compared, carry out early warning and judge, specifically be meant:

A, when the maximum perpendicular load surpasses or equals to design vertical load, perhaps the maximum horizontal load surpasses or equals the design level load, promptly sends and waves the overload early warning signal;

B, be less than or equal to relative phase minimal design electric clearance when mutually minimum relatively electric clearance, perhaps the minimum electric clearance of ground wire is less than or equal to relative ground wire minimal design electric clearance relatively, promptly sends and waves the amplitude early warning signal that exceeds standard.

Preferably, the type of described lead is steel-cored aluminium strand or steel core aluminium alloy stranded conductor.

Preferably, described gold utensil is a wire clamp.

The present invention compared with prior art has following beneficial effect:

The first, provide a kind of rational dynamic loads acquisition mode: the present invention gives chapter and verse and waves frequency collection dynamic loads data, satisfy the low requirement of on-line monitoring system energy consumption, having solved does not have according to gathering and the high problem of lasting long period acquisition mode power consumption.

The second, improve accuracy, effectively avoid accident, improve line security: a kind of overhead transmission line galloping method for early warning provided by the invention, proposed to estimate the implementation of conductor galloping amplitude based on the conductor galloping loads change, propose the conductor galloping fault pre-alarming implementation of concrete mechanics and electric aspect, guaranteed transmission line of electricity safety.

Description of drawings

Fig. 1 is the dynamic loads instrumentation plan of the conductor galloping among the embodiment 1;

Fig. 2 is the dynamic loads instrumentation plan of the conductor galloping among the embodiment 2;

Fig. 3 is the workflow diagram of the overhead transmission line galloping method for early warning of embodiment 1 and 2.

Embodiment

Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.

Embodiment 1

Referring to Fig. 1, comprise conductor vibration sensor 1, wire tension sensor 2, insulator chain pulling force sensor 3, suspension insulator and gold utensil 4, overhead transmission line conductor 5, tangent tower 6 in the embodiment of the invention 1.Described gold utensil is a wire clamp.

Adopt a kind of overhead transmission line galloping method for early warning of present embodiment, may further comprise the steps:

Step S1, monitoring ice coating wire dynamic loads situation of change:

When circuit equivalence ice covering thickness h＞0, measure conductor galloping frequency v with conductor vibration sensor 1, wave T=1/v cycle length, use the horizontal loading F in wire tension sensor 2 and at least one period T of insulator chain pulling force sensor 3 continuous coverages simultaneously _h(t) and vertical load F _v(t) data.

Wherein circuit equivalence ice covering thickness h can calculate by existing monitoring technology, and conductor vibration sensor 1 is fixed on the lead, and wire tension sensor 2 and insulator chain pulling force sensor 3 can be resistance strain type sensor or fiber Bragg grating strain sensor; Wire tension sensor 2 is fixed on conductive line surfaces, is used for measuring circuit horizontal loading F _h(t) delta data; Insulator chain pulling force sensor 3 is installed in the insulator chain upper end, is used for measuring circuit vertical load F _v(t) delta data.

Step S2 estimates conductor galloping amplitude A according to the horizontal dynamic loads change:

The ice coating wire off-position moves f before waving _s(x) be

f _s(x)＝xtanβ-γx(l-x)/(2F ₀cosβ)

In the formula, γ is the ice coating wire linear load, and β is a height difference angle, and l is a span, F ₀Be ice coating wire quiescent levels load, i.e. Horizontal Tension.

F ₀Obtain by following formula:

$F_0=\sqrt{\frac{{\mathrm{\&gamma;}}^2{\mathrm{<figure-callout\; id="3"\; label="l"\; filenames="HSA00000326827900012.png"\; state="\{\{state\}\}">l</figure-callout>}}^3\cos \mathrm{\&beta;}}{24(S_s-l/\cos \mathrm{\&beta;})}}$

In the formula, S _sBe the static line length of ice coating wire, S _sCalculate by following formula:

$S_s={\&Integral;}_0^{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HSA00000326827900012.png"\; state="\{\{state\}\}">l</figure-callout>}}\sqrt{1+[\frac{{\mathrm{df}}_s\left(x\right)}{\mathrm{dx}}{]}^2}\mathrm{dx}$

Stable conductor galloping shape approximation is a simple harmonic wave, then conductor galloping displacement f _g(x t) is

f _g(x，t)＝A?sin(nπx/l)sinwt

In the formula, A is the conductor galloping amplitude, and n is for waving the half-wave number, and w is for waving angular frequency, w=2 π v;

(x t) is then to wave the displacement f of lead

f(x，t)＝f _s(x)+f _g(x，t)

Conductor galloping line length S _gFor

$S_g={\&Integral;}_0^{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HSA00000326827900012.png"\; state="\{\{state\}\}">l</figure-callout>}}\sqrt{1+{\left[\frac{{\&PartialD;f}_g(x,t)}{\&PartialD;x}\right]}^2}\mathrm{dx}$

When waving, be fixed on the wire tension sensor 2 horizontal loading F that surveys of conductive line surfaces _h(t) with ice coating wire quiescent levels load F ₀Satisfy Hooke's law

F _h(t)-F ₀＝ΔF＝kΔS/S _s＝k(S _g-S _s)/S _s

In the formula, k=EA _r, E is the lead synthetical elastic modulus, A _rFor conductive wire cross-section is amassed.

With line length computing formula substitution following formula, obtain

F when 1. n is even number _h(t)-F ₀≈ n ²π ²KA ²Sin ²Wt/ (4l)

F when 2. n is odd number _h(t)-F ₀≈ n ²π ²KA ²Sin ²Wt/ (4l)-2 γ klAsinwt/ (n π F ₀Cos β)

＝n ²π ²kA ²sin ²wt/(4l)-16dkAsinwt/(nπl)

In the formula, d is a line-sag.

Obviously in above-mentioned two formulas, to count n relevant with waving amplitude A and half-wave when the lead horizontal loading was maximum, can pass through lead horizontal loading maximal value F at this moment _MaxCalculate conductor galloping amplitude A

F _max＝max(F _h(t))

In the formula, it is relevant that A and half-wave are counted the n value, waves amplitude after general n surpasses 5 and do not constitute a threat to, and therefore calculates n and be respectively 1 to 4 the amplitude of waving.Because actual measurement is waved amplitude and is no more than 12 meters, if therefore maximum is waved amplitude greater than 12 meters then get maximum to wave amplitude be 12 meters, if less than would directly get maximal value and wave amplitude A as maximum _Max

Step S3 carries out the transmission line galloping early warning, as shown in Figure 3, according to the design parameter of suspension insulator and gold utensil 4, overhead transmission line conductor 5 and tangent tower 6, carries out design load and calculates and design electric clearance calculating; According to the load measurement and the amplitude estimated data of conductor galloping, carry out maximum dynamic load and minimum electric clearance and calculate; When surpassing design load or minimum electric clearance less than the design electric clearance, sends maximum dynamic load early warning information.

Described step S3 may further comprise the steps:

S3.1 carries out maximum dynamic load and minimum electric clearance calculates:

Maximum dynamic load comprises maximum perpendicular load F among the described step S3 _VmaxWith maximum horizontal load F _Max, wherein,

F _vmax＝max(F _v(t))

F _max＝max(F _h(t))

Minimum electric clearance comprises the minimum electric clearance of mutually minimum relatively electric clearance and relative ground wire, wherein, and mutually minimum relatively electric clearance D _P-pminWith the minimum electric clearance D of relative ground wire _P-gminBe respectively

D _p-pmin＝D _p-p-2A _max

D _p-gmin＝D _p-g-A _max

In the formula, D _P-pBe vertical phase spacing, D _P-gBe vertically opposite ground linear distance.

S3.1 carries out design load and calculates and design electric clearance calculating:

The design parameter of suspension insulator and gold utensil 4, overhead transmission line conductor 5 and tangent tower 6 among the described step S3 specifically comprises the dynamo-electric failing load F of insulator _IAnd safety coefficient S _FI, gold utensil physical strength F _HAnd safety coefficient S _FH, lead calculating pull-off force F _CAnd safety coefficient S _FC, lead deadweight m, lead design ice covering thickness h _mWith shaft tower vertical span l _V

The design load of carrying out is calculated and is comprised that the design vertical load calculates and the design level load calculates; Wherein, the design vertical load is calculated as

F _v0＝min(F _T0，F _I0，F _H0)

F _T0＝n ₁γ _ml _V

F _I0＝F _I/S _fI

F _H0＝F _H/S _fH

In the formula, n ₁Be lead division number, γ _mBe the lead linear load under the design ice thickness, γ _mUtilize m and h _mCalculate;

The design level load is calculated as

F _h0＝F _C/S _fC

The design electric clearance comprises relative phase minimal design electric clearance and relative ground wire minimal design electric clearance, and described relative phase minimal design electric clearance specifically is meant the alternate lead minimum air void d that does not take place to discharge _P-p, described relative ground wire minimal design electric clearance is meant the minimum air void d of the relative ground wire that does not take place to discharge _P-g

S3.3 carries out the early warning judgement according to maximum dynamic load or minimum electric clearance:

Work as F _Vmax〉=F _V0, perhaps F _Max〉=F _H0, then send and wave the overload early warning signal;

Work as D _P-pmin≤ d _P-p, perhaps D _P-gmin≤ d _P-g, then send and wave the amplitude early warning signal that exceeds standard.

Embodiment 2

The present invention can install pulling force sensor enforcement at tangent tower in the same shelves and anchor support, referring to Fig. 2, comprise conductor vibration sensor 1, wire tension sensor 2, insulator chain pulling force sensor 3, insulator chain and gold utensil 4, overhead transmission line 5, tangent tower 6, anchor support 13 in the embodiment of the invention 2.

Adopt 2 one kinds of overhead transmission line galloping method for early warning of embodiment, may further comprise the steps:

Step S1, monitoring ice coating wire dynamic loads situation of change:

When circuit equivalence ice covering thickness h＞0, measure conductor galloping frequency v with conductor vibration sensor 1, wave T=1/v cycle length, use the horizontal loading F in wire tension sensor 2 and at least one period T of insulator chain pulling force sensor 3 continuous coverages simultaneously _h(t) and vertical load F _v(t) data.

Wherein circuit equivalence ice covering thickness h can calculate by existing monitoring technology, conductor vibration sensor 1 is fixed on the lead, wire tension sensor 2 and insulator chain pulling force sensor 3 can be resistance strain type sensor or fiber Bragg grating strain sensor, wire tension sensor 2 is fixed on conductive line surfaces, is used for measuring circuit horizontal loading F _h(t) delta data; Insulator chain pulling force sensor 3 is installed in the insulator chain upper end, is used for measuring circuit vertical load F _v(t) delta data.

Step S2 estimates conductor galloping amplitude A according to the horizontal dynamic loads change:

The ice coating wire off-position moves f before waving _s(x) be

f _s(x)＝xtanβ-γx(l-x)/(2F ₀cosβ)

In the formula, γ is the ice coating wire linear load, and β is a height difference angle, and l is a span, F ₀Be ice coating wire quiescent levels load, i.e. Horizontal Tension.

F ₀Obtain by following formula:

$F_0=\sqrt{\frac{{\mathrm{\&gamma;}}^2{\mathrm{<figure-callout\; id="3"\; label="l"\; filenames="HSA00000326827900012.png"\; state="\{\{state\}\}">l</figure-callout>}}^3\cos \mathrm{\&beta;}}{24(S_s-l/\cos \mathrm{\&beta;})}}$

In the formula, S _sBe the static line length of ice coating wire, S _sCalculate by following formula:

$S_s={\&Integral;}_0^{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HSA00000326827900012.png"\; state="\{\{state\}\}">l</figure-callout>}}\sqrt{1+[\frac{{\mathrm{df}}_s\left(x\right)}{\mathrm{dx}}{]}^2}\mathrm{dx}$

Stable conductor galloping shape approximation is a simple harmonic wave, then conductor galloping displacement f _g(x t) is

f _g(x，t)＝Asin(nπx/l)sinwt

In the formula, A is the conductor galloping amplitude, and n is for waving the half-wave number, and w is for waving angular frequency, w=2 π v;

(x t) is then to wave the displacement f of lead

f(x，t)＝f _s(x)+f _g(x，t)

Conductor galloping line length S _gFor

$S_g={\&Integral;}_0^{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HSA00000326827900012.png"\; state="\{\{state\}\}">l</figure-callout>}}\sqrt{1+{\left[\frac{{\&PartialD;f}_g(x,t)}{\&PartialD;x}\right]}^2}\mathrm{dx}$

When waving, be fixed on the wire tension sensor 2 horizontal loading F that surveys of conductive line surfaces _h(t) with ice coating wire quiescent levels load F ₀Satisfy Hooke's law

F _h(t)-F ₀＝ΔF＝kΔS/S _s＝k(S _g-S _s)/S _s

In the formula, k=EA _r, E is the lead synthetical elastic modulus, A _rFor conductive wire cross-section is amassed.

With line length computing formula substitution following formula, obtain

F when 1. n is even number _h(t)-F ₀≈ n ²π ²KA ²Sin ²Wt/ (4l)

F when 2. n is odd number _h(t)-F ₀≈ n ²π ²KA ²Sin ²Wt/ (4l)-2 γ klAsinwt/ (n π F ₀Cos β)

＝n ²π ²kA ²sin ²wt/(4l)-16dkAsinwt/(nπl)

In the formula, d is a line-sag.

Obviously in above-mentioned two formulas, to count n relevant with waving amplitude A and half-wave when the lead horizontal loading was maximum, can go out conductor galloping amplitude A by lead horizontal loading maximum value calculation at this moment

F _max＝max(F _h(t))

In the formula, it is relevant that A and half-wave are counted the n value, waves amplitude after general n surpasses 5 and do not constitute a threat to, and therefore calculates n and be respectively 1 to 4 the amplitude of waving.Because actual measurement is waved amplitude and is no more than 12 meters, if therefore maximum is waved amplitude greater than 12 meters then get maximum to wave amplitude be 12 meters, if less than would directly get maximal value and wave amplitude A as maximum _Max

Step S3 carries out the transmission line galloping early warning, as shown in Figure 3, according to the design parameter of suspension insulator and gold utensil 4, overhead transmission line conductor 5 and tangent tower 6, carries out design load and calculates and design electric clearance calculating; According to the load measurement and the amplitude estimated data of conductor galloping, carry out maximum dynamic load and minimum electric clearance and calculate; When surpassing design load or minimum electric clearance less than the design electric clearance, sends maximum dynamic load early warning information.

Described step S3 specifically comprises:

S3.1 carries out maximum dynamic load and minimum electric clearance calculates:

Described maximum dynamic load comprises maximum perpendicular load F _VmaxWith maximum horizontal load F _MaxWherein,

F _vmax＝max(F _v(t))

F _max＝max(F _h(t))

Minimum electric clearance comprises the minimum electric clearance of relative phase and relative ground wire, wherein, and mutually minimum relatively electric clearance D _P-pminWith the minimum electric clearance D of relative ground wire _P-gminBe respectively

D _p-pmin＝D _p-p-2A _max

D _p-gmin＝D _p-g-A _max

In the formula, D _P-pBe vertical phase spacing, D _P-gBe vertically opposite ground linear distance.

S3.2 carries out design load and calculates and design electric clearance calculating:

The design parameter of suspension insulator and gold utensil 4, overhead transmission line conductor 5 and tangent tower 6 among the described step S3 specifically comprises the dynamo-electric failing load F of insulator _IAnd safety coefficient S _FI, gold utensil physical strength F _HAnd safety coefficient S _FH, lead calculating pull-off force F _CAnd safety coefficient S _FC, lead deadweight m, lead design ice covering thickness h _mWith shaft tower vertical span l _V

The design load of carrying out is calculated and is comprised that the design vertical load calculates and the design level load calculates; Wherein, the design vertical load is calculated as

F _v0＝min(F _T0，F _I0，F _H0)

F _T0＝n ₁γ _ml _V

F _I0＝F _I/S _fI

F _H0＝F _H/S _fH

In the formula, n ₁Be lead division number, γ _mBe the lead linear load under the design ice thickness, γ _mUtilize m and h _mCalculate;

The design level load is

F _h0＝min(F _C0，F _I0，F _H0)

F _C0＝F _C/S _fC

The design electric clearance comprises relative phase minimal design electric clearance and relative ground wire minimal design electric clearance, and described relative phase minimal design electric clearance specifically is meant the alternate lead minimum air void d that does not take place to discharge _P-p, described relative ground wire minimal design electric clearance is meant the minimum air void d of the relative ground wire that does not take place to discharge _P-g

S3.3 carries out the early warning judgement according to maximum dynamic load or minimum electric clearance:

Among the described step S3, work as F _Vmax〉=F _V0, perhaps F _Max〉=F _H0, send and wave the overload early warning signal;

Work as D _P-pmin≤ d _P-p, perhaps D _P-gmin≤ d _P-g, send and wave the amplitude early warning signal that exceeds standard.

Obviously, those skilled in the art should be understood that, above-mentioned each step of the present invention or each module can realize with the general calculation device, they can concentrate on single calculation element or be distributed on the network that a plurality of calculation element forms, thereby, they can be stored in the memory storage and carry out, or they are made into each integrated circuit modules respectively, or a plurality of steps in them or module be made the single integrated circuit module realize by calculation element.Therefore, the present invention is not restricted to any specific hardware and software combination.

The foregoing description is a preferred implementation of the present invention; but embodiments of the present invention are not limited by the examples; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.

Claims (9)

1. an overhead transmission line galloping method for early warning is characterized in that, comprises the steps:

S1, monitoring ice coating wire dynamic loads situation of change are measured vertical load and horizontal loading data at least one cycle;

S2, estimate conductor galloping amplitude A according to the horizontal dynamic loads change;

S3, according to the dynamic loads of the conductor galloping among the step S1 measure and step S2 in conductor galloping amplitude A, carry out maximum dynamic load and minimum electric clearance and calculate;

S4, according to the design parameter of suspension insulator and gold utensil, overhead transmission line conductor and tangent tower, carry out that design load is calculated and the design electric clearance calculates;

S5, design load among maximum dynamic load among the step S3 and the step S4 is compared, perhaps minimum electric clearance among the step S3 and the design electric clearance among the step S4 are compared, carry out early warning and judge, return step S1.

2. according to the described a kind of overhead transmission line galloping method for early warning of claim 1, it is characterized in that described step S1 specifically is meant:

When circuit equivalence ice covering thickness h＞0, the conductor vibration sensor is fixed on the lead, by conductor vibration sensor measurement conductor galloping frequency v, then wave T=1/v cycle length;

The wire tension sensor is fixed on conductive line surfaces, by the circuit horizontal loading F at least one period T of wire tension sensor continuous coverage _h(t) delta data;

The insulator chain pulling force sensor is installed in the insulator chain upper end, by the circuit vertical load F at least one period T of insulator chain pulling force sensor continuous coverage _v(t) delta data.

3. according to the described a kind of overhead transmission line galloping method for early warning of claim 2, it is characterized in that described wire tension sensor and insulator chain pulling force sensor are resistance strain type sensor or fiber Bragg grating strain sensor.

4. according to the described a kind of overhead transmission line galloping method for early warning of claim 2, it is characterized in that described S2 specifically may further comprise the steps:

S2.1 calculates the static line length S of ice coating wire _s:

By following obtain wave before the ice coating wire off-position move f _s(x):

f _s(x)＝xtanβ-γx(l-x)/(2F ₀cosβ)

In the formula, γ is the ice coating wire linear load, and β is a height difference angle, and l is a span, F ₀Be ice coating wire quiescent levels load;

Obtain F by following formula ₀:

$F_0=\sqrt{\frac{{\mathrm{\&gamma;}}^2{l}^3\cos \mathrm{\&beta;}}{24(S_s-l/\cos \mathrm{\&beta;})}}$

In the formula, S _sBe the static line length of ice coating wire, S _sCalculate by following formula:

$S_s={\&Integral;}_0^l\sqrt{1+[\frac{{\mathrm{df}}_s\left(x\right)}{\mathrm{dx}}{]}^2}\mathrm{dx}$

S2.2 calculates conductor galloping line length S _g:

Conductor galloping displacement f _g(x, t) ask for by following formula:

f _g(x，t)＝A?sin(nπx/l)sinwt

In the formula, A is the conductor galloping amplitude, and n is for waving the half-wave number, and w is for waving angular frequency, w=2 π v;

(x t) is then to wave the displacement f of lead

f(x，t)＝f _s(x)+f _g(x，t)

Conductor galloping line length S _gFor

$S_g={\&Integral;}_0^l\sqrt{1+{\left[\frac{{\&PartialD;f}_g(x,t)}{\&PartialD;x}\right]}^2}\mathrm{dx}$

S2.3 obtains maximum and waves amplitude A _Max:

When waving, the wire tension sensor that is fixed on conductive line surfaces is surveyed horizontal loading F _h(t) with ice coating wire quiescent levels load F ₀Satisfy Hooke's law

F _h(t)-F ₀＝ΔF＝kΔS/S _s＝k(S _g-S _s)/S _s

In the formula, k=EA _r, E is the lead synthetical elastic modulus, A _rFor conductive wire cross-section is amassed;

With line length computing formula substitution following formula:

F when 1. n is even number _h(t)-F ₀≈ n ²π ²KA ²Sin ²Wt/ (4l)

F when 2. n is odd number _h(t)-F ₀≈ n ²π ²KA ²Sin ²Wt/ (4l)-2 γ klAsinwt/ (n π F ₀Cos β)

＝n ²π ²kA ²sin ²wt/(4l)-16dkAsinwt/(nπl)

In the formula, d is a line-sag;

Go out conductor galloping amplitude A by lead horizontal loading maximum value calculation

F _max＝max(F _h(t))

In the formula, calculate n be respectively 1 to 4 wave amplitude A, if maximum is waved amplitude greater than 12 meters then get maximum and wave amplitude A _MaxBe 12 meters, if maximum wave amplitude less than directly get maximal value and wave amplitude A as maximum _Max

5. according to the described a kind of overhead transmission line galloping method for early warning of claim 4, it is characterized in that described step S3 carries out maximum dynamic load and minimum electric clearance calculates, and specifically is meant:

Described maximum dynamic load comprises maximum perpendicular load F _VmaxWith maximum horizontal load F _Max, wherein,

F _vmax＝max(F _v(t))

F _max＝max(F _h(t))

Minimum electric clearance comprises the minimum electric clearance of mutually minimum relatively electric clearance and relative ground wire, wherein, and mutually minimum relatively electric clearance D _P-pminWith the minimum electric clearance D of relative ground wire _P-gminObtain by following formula respectively:

D _p-pmin＝D _p-p-2A _max

D _p-gmin＝D _p-g-A _max

In the formula, D _P-pBe vertical phase spacing, D _P-gBe vertically opposite ground linear distance.

6. according to the described a kind of overhead transmission line galloping method for early warning of claim 5, it is characterized in that the design parameter of suspension insulator and gold utensil, overhead transmission line conductor and tangent tower comprises the dynamo-electric failing load F of insulator among the described step S4 _IAnd safety coefficient S _FI, gold utensil physical strength F _HAnd safety coefficient S _FH, lead calculating pull-off force F _CAnd safety coefficient S _FC, lead deadweight m, lead design ice covering thickness h _mWith shaft tower vertical span l _V

The design load of carrying out among the described step S4 is calculated and is comprised that the design vertical load calculates and the design level load calculates; Wherein, the design vertical load is calculated as

F _v0＝min(F _T0，F _I0，F _H0)

F _T0＝n ₁γ _ml _V

F _I0＝F _I/S _fI

F _H0＝F _H/S _fH

In the formula, n ₁Be lead division number, γ _mBe the lead linear load under the design ice thickness, γ _mUtilize m and h _mCalculate;

The design level load is calculated as

F _h0＝F _C/S _fC

The design electric clearance comprises relative phase minimal design electric clearance and relative ground wire minimal design electric clearance, and described relative phase minimal design electric clearance specifically is meant the alternate lead minimum air void d that does not take place to discharge _P-p, described relative ground wire minimal design electric clearance is meant the minimum air void d of the relative ground wire that does not take place to discharge _P-g

7. according to the described a kind of overhead transmission line galloping method for early warning of claim 6, it is characterized in that, among the described step S5 design load among maximum dynamic load among the step S3 and the step S4 is compared, perhaps minimum electric clearance among the step S3 and the design electric clearance among the step S4 are compared, carry out early warning and judge, specifically be meant:

A, when the maximum perpendicular load surpasses or equals to design vertical load, perhaps the maximum horizontal load surpasses or equals the design level load, promptly sends and waves the overload early warning signal;

B, be less than or equal to relative phase minimal design electric clearance when mutually minimum relatively electric clearance, perhaps the minimum electric clearance of ground wire is less than or equal to relative ground wire minimal design electric clearance relatively, promptly sends and waves the amplitude early warning signal that exceeds standard.

8. according to the described a kind of overhead transmission line galloping method for early warning of claim 1, it is characterized in that the type of described lead is steel-cored aluminium strand or steel core aluminium alloy stranded conductor.

9. according to the described a kind of overhead transmission line galloping method for early warning of claim 1, it is characterized in that described gold utensil is a wire clamp.

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