CN105222749A - A kind of power transmission line sag on-line monitoring method and device - Google Patents

Abstract

The present invention discloses a kind of power transmission line sag on-line monitoring method, its wire first between adjacent two shaft towers is installed the on-Line Monitor Device near a shaft tower, utilize laser range finder measure the horizontal range between the vertical range on adjacent two shaft tower top to ground and two shaft towers and record data; To transmission line of electricity energising, on-Line Monitor Device adopts wire mutual inductance to get the power supply mode of energy; The data measured configure in on-Line Monitor Device by GPRS mode or hand-held set; Utilize the inclination angle in relative level face, obliquity sensor measure traverse line one end; Microcontroller in on-Line Monitor Device adopts accurate sag computing method to calculate the height of wire minimum point apart from ground; Position, sag, equation, obliquity information are formed a Frame by on-Line Monitor Device, are sent to remote server or internet by GPRS mode.The present invention, by carrying out mathematical modeling to transmission line of electricity, accurately calculates maximum sag, is conducive to the on-line monitoring of sag.

Description

A kind of power transmission line sag on-line monitoring method and device

Technical field

The present invention relates to electric power supervisory control technical field, especially relate to a kind of power transmission line sag on-line monitoring method and device.

Background technology

Power transmission line sag is the leading indicator of line design and operation, is related to the security of operation of circuit, therefore must control in the scope of design code.Power transmission line sag along with working time increase and weather and along thread environment change and change, arc sag of wire of power transmission line changes, wire can be caused can not to meet regulatory requirements across thing safe distance over the ground or to friendship, threaten the safe operation of circuit, even cause line fault, bring huge economic loss and personal safety to threaten to the productive life of people.Therefore, conducting wire sag needs restriction within limits, and can Real-Time Monitoring line-sag situation in the operational process of circuit, to reflect the ruuning situation of circuit, gets rid of potential potential safety hazard, so that the operation that transmission line of electricity is safer.

At present, power transmission line sag monitoring method mainly contains: measurement of dip angle method, thermometry, tonometry, radar range finding, laser ranging and image method etc., wherein temperature and tonometry need the initial operating condition obtaining pole line, rely on Equation of Overhead Wire to carry out solving calculating, and have comparatively big error by the change of monitoring of environmental condition, radar, laser ranging and tilt-angle method monitoring method are complicated, and have higher requirement to monitoring system, involve great expense, be unfavorable for monitoring being installed on a large scale.Above-mentioned measuring method all can not realize real-time online measuring well, measuring period is long, and efficiency is low, needs to use more manpower, precision also can be affected, be therefore necessary searching one simply and easily monitoring method to realize transmission line of electricity pole line sag monitoring.

Summary of the invention

For solving the problem, the object of this invention is to provide a kind of power transmission line sag on-line monitoring method, the power transmission line sag on-Line Monitor Device that a kind of precision is high, simple to operate, practical, expense is low is provided simultaneously.

For achieving the above object, the present invention adopts following technical scheme:

A kind of power transmission line sag on-line monitoring method, it comprises the following steps:

On-Line Monitor Device installed by step S1, wire between adjacent two shaft towers, and one of them in two shaft towers of this on-Line Monitor Device, after installation, utilize the horizontal range between the vertical range on adjacent two shaft tower top to the ground of laser range finder measurement and two shaft towers and record data;

Step S2, to transmission line of electricity energising, on-Line Monitor Device adopt wire mutual inductance get can power supply mode;

Step S3, the data measured in step S1 are configured in on-Line Monitor Device by GPRS mode or hand-held set;

The inclination angle in step S4, the relative level face, obliquity sensor measure traverse line one end utilized in on-Line Monitor Device, the tangent value at inclination angle is the slope of this point, and above-mentioned wire one end refers to the one end near on-Line Monitor Device installation site;

Microcontroller in step S5, on-Line Monitor Device adopts following sag computing method to calculate the height of wire minimum point apart from ground: with the wire distance ground minimum point between adjacent two shaft towers for initial point sets up x-y coordinate system, obtain the catenary equation of wire; Measure the slope of the wire one end obtained and above-mentioned Catenary equation of line strung according in the horizontal range data between the height of two shaft towers measured in step S1 and two shaft towers, step S4, obtain the vertical range on the sag equation of the transmission line of electricity between two shaft towers and the higher shaft tower top of the height of wire minimum point in two shaft towers;

GPS module in step S6, on-Line Monitor Device gathers the positional information of on-Line Monitor Device, then the sag information obtained in positional information and step S5, equation parameter, obliquity information are formed a Frame by on-Line Monitor Device, are sent to remote server or internet by GPRS mode.

Further, in step S1, on-Line Monitor Device is installed in the wherein one end at the wire two ends between adjacent two shaft towers, and on-Line Monitor Device is near the shaft tower be connected with this end of wire, and distance is therebetween with 5 ~ 10cm.

Further, in step S1, the horizontal range between adjacent two shaft towers is 30 meters ~ 1500 meters.

Further, in step S3, the data measured in step S1 are configured in on-Line Monitor Device by GPRS mode: the device numbering of two shaft tower altitude informations, horizontal range and the on-Line Monitor Device measured in step S1 transfers in remote server by GPRS mode by laser range finder, on-Line Monitor Device intermittent access remote server, according to device numbering to remote server request two shaft tower horizontal range and elevation information, write in the EEPROM of self after obtaining data.

Further, in step S3, the data measured in step S1 are configured in on-Line Monitor Device by hand-held set, adopt following two kinds of modes: technician inputs two shaft tower height and horizontal range information in hand-held set; Or hand-held set access remote server obtains above-mentioned information, technician is positioned at and is less than 30 meters of scopes carries out manual radio configuration shaft tower height and horizontal range information apart from on-Line Monitor Device.

Further, in step S4, the inclination angle scope utilizing the relative level face, obliquity sensor measure traverse line one end in on-Line Monitor Device is-60 ° ~+60 °.

Further, the catenary equation in step S5 comprises the following steps:

Step S5.1, with the wire between adjacent two shaft towers apart from ground minimum point for initial point sets up x-y coordinate system;

Step S5.2, by appoint get on wire a bit for object carries out force analysis, obtain this some pulling force T that bears and horizontal stress H;

Step S5.3, math equation according to wire between two shaft towers:

$y=\frac{1}{2}\underset{0}{\overset{x}{\∫}}\left(e^{\frac{\mathrm{\ρ}x}{H}}-e^{-\frac{\mathrm{\ρ}x}{H}}\right)dx=\frac{H}{2\mathrm{\ρ}}\left(e^{\frac{\mathrm{\ρ}x}{H}}+e^{-\frac{\mathrm{\ρ}x}{H}}\right)+C1$

Wherein, ρ is gravity suffered by conductor, and e is natural constant; After setting up x-y coordinate system, $C1=\frac{-H}{\mathrm{\ρ}};$

Obtain the catenary equation of wire:

$y=\frac{1}{2a}(e^{ax}+e^{-ax})-\frac{1}{a},$

Wherein, a is catenary coefficient.

Then according to above-mentioned equation model, the value of trying to achieve unknown quantity a is calculated.

First by mathematical analysis and actual conditions, show that the value of a is between 0.000001 to 0.2.The value analyzing reason: a determines the opening and closing degree of catenary opening, and a is larger, and opening is less.As a=0.000001, drawn by matlab simulation, in distance true origin horizontal direction 200 meters of positions, y value is only 2cm, and for normal transmission line, this can not accomplish.So a value minimum value is chosen for 0.00001.As a=0.2, analyzed by matlab and draw: distance true origin horizontal direction 10 meters, y value is 15m, and this also can not reach under normal circumstances.Have so a value one in reality is decided to be 0.000001 ~ 0.2, a and only has a value to meet the requirements.

The tie point of setting wire and two shaft towers is respectively A (X0, Y0), B (X1, Y1), A point shaft tower top is H0 far from the vertical range on ground, B point shaft tower top is H1 far from the vertical range on ground, H1 > H0, between two shaft towers, horizontal range is L, difference in height between two shaft towers is d, on-Line Monitor Device is arranged on the position near B point, the inclination angle that obliquity sensor measurement obtains B point is r, and slope is k=tan (r), so has following mathematical model:

$Y0=\frac{1}{2a}(e^{aX0}+e^{-aX0})-\frac{1}{a}\mathrm{...}<1>$

$Y1=\frac{1}{2a}(e^{aX1}+e^{-aX1})-\frac{1}{a}\mathrm{...}<2>$

$k=y^{\&prime;}\left(X1\right)=\frac{1}{2}(e^{aX1}-e^{-aX1})\mathrm{...}<3>$

X1-X0＝L...................................................<4>

Y1-Y0＝H1-H0＝d.....................................................<5>

Visible, 5 unknown numbers X0, X1, Y0, Y1, a, 5 equations.

Solve an equation, finally try to achieve the exact numerical values recited of a, so just obtaining wire between two shaft towers take minimum point as the equation curve of true origin, the concrete equation of locus of the transmission line of electricity namely between two shaft towers.The concrete numerical value of X1 is tried to achieve again according to formula <3>, Y1 numerical value is tried to achieve according to formula <2>, Y1 is the vertical range of the tie point B of wire minimum point (true origin) distance shaft tower and wire, Y0 is the vertical range of the tie point A of wire minimum point (true origin) distance shaft tower and wire, and the value that H1 deducts Y1 is the height of this section lead minimum point apart from ground.

Further, remote server sets up 3 dimensional drawing according to the data in step S6 in conjunction with map software, carries out more detailed analysis.

A kind of power transmission line sag on-Line Monitor Device, it stationary installation comprising on-Line Monitor Device housing and be fixed on transmission line of electricity, stationary installation comprises two semicircle siliconized plates, two semicircle siliconized plate two ends connect to form an annular siliconized plate by web member, the internal diameter of annular siliconized plate equals power line conductive linear diameter, and annular siliconized plate is wound with inductive coil, on-Line Monitor Device housing is arranged on the securing means, microcontroller is provided with in housing, obliquity sensor, storer, power module, GPRS wireless communication module, GPS module and ZigBee wireless module, microcontroller by wire respectively with obliquity sensor, storer, power module, GPRS wireless communication module, GPS module is connected with ZigBee wireless module, the power module of powering for above-mentioned all parts comprises the wire induction power taking unit be electrically connected successively, rectification filtering module and storage capacitor, wire induction power taking unit is connected with the inductive coil that annular siliconized plate is wound around.

Described power transmission line sag on-Line Monitor Device, its silicon steel material is specifically selected according to the electric current on wire.The number of turns of inductive coil determines according to on-Line Monitor Device maximum power dissipation and wire average current, and on-Line Monitor Device requires that on transmission line of electricity, minimum working current is 20A.

Owing to adopting technical scheme as above, the present invention has following superiority:

This power transmission line sag on-line monitoring method, its measuring accuracy is high, degree of stability is high, implementation method is simple, image data accurately and reliably, by the horizontal range between the elevation information of known adjacent two shaft towers and two shaft towers, mathematical modeling is carried out to transmission line of electricity, accurately calculate maximum sag, not by the impact of geographic position, environmental factor, Horizontal Tension etc., be conducive to the on-line monitoring of sag, use can be popularized, transmission line of electricity solid figure can be depicted in conjunction with true map in remote server, thus carry out more detailed on-line analysis.Electric power network technique personnel can be made easily to analyze sag feature better, for large data and cloud computing lay the first stone later.

This power transmission line sag on-Line Monitor Device, its structure is simple, and perfect in shape and function, is powered by self-energizing, greatly reduces later stage manual intervention, durable, has very high using value.

Accompanying drawing explanation

Fig. 1 is the structural representation of power transmission line sag on-Line Monitor Device;

Fig. 2 is the fundamental diagram of power transmission line sag on-Line Monitor Device;

Fig. 3 is the transmission line of electricity simulating shape figure of power transmission line sag on-line monitoring method;

Wire shape when Fig. 4 is catenary coefficient a=0.000001 in power transmission line sag on-line monitoring method;

Wire shape when Fig. 5 is catenary coefficient a=0.00001 in power transmission line sag on-line monitoring method;

Wire shape when Fig. 6 is catenary coefficient a=0.0001 in power transmission line sag on-line monitoring method;

Wire shape when Fig. 7 is catenary coefficient a=0.02 in power transmission line sag on-line monitoring method;

Wire shape when Fig. 8 is catenary coefficient a=0.2 in power transmission line sag on-line monitoring method;

Fig. 9 is the analysis chart of Equation f (a) in power transmission line sag on-line monitoring method.

In figure: 1-housing; 2 (a, b)-siliconized plates; 3-web member.

Embodiment

Below in conjunction with drawings and Examples, technical scheme of the present invention is described in further detail.

As shown in Figure 1, 2, this power transmission line sag on-Line Monitor Device, it stationary installation comprising on-Line Monitor Device housing 1 and be fixed on transmission line of electricity, stationary installation comprises semicircle siliconized plate 2a, semicircle siliconized plate 2b, two semicircle siliconized plate two ends connect to form an annular siliconized plate be enclosed within transmission line of electricity by web member 3, web member adopts bolt or screw, and the internal diameter of annular siliconized plate equals power line conductive linear diameter, and annular siliconized plate is wound with inductive coil, on-Line Monitor Device housing is arranged on the securing means, microcontroller is provided with in housing, obliquity sensor, storer, power module, GPRS wireless communication module, GPS module and ZigBee wireless module, microcontroller by wire respectively with obliquity sensor, storer, power module, GPRS wireless communication module, GPS module is connected with ZigBee wireless module, the power module of powering for above-mentioned all parts comprises the wire induction power taking unit be electrically connected successively, rectification filtering module and storage capacitor, wire induction power taking unit is connected with the inductive coil that annular siliconized plate is wound around.

Above-mentioned ZigBee wireless module, it is for matching with the same hand-held set with ZigBee module data or the configuration of modifying.

Above-mentioned GPRS wireless communication module, it is for being sent to remote server or internet by the data collected and result of calculation and GPS position information.

Above-mentioned GPS module, it is sent on remote server or internet by GPRS mode for collection position information.

Described power transmission line sag on-Line Monitor Device, its silicon steel material is specifically selected according to the electric current on wire.The number of turns of inductive coil determines according to on-Line Monitor Device maximum power dissipation and wire average current, and on-Line Monitor Device requires that on transmission line of electricity, minimum working current is 20A.

In Fig. 3 ~ 9, in x-y coordinate system, the unit of x, y is m; In Fig. 4 ~ 8, D represents distance, and h represents height, and unit is m.

Composition graphs 3 ~ 9, power transmission line sag on-line monitoring method of the present invention, it comprises following concrete steps:

On-Line Monitor Device is installed in the wherein one end at step S1, wire two ends between adjacent two shaft towers, and on-Line Monitor Device is near the shaft tower be connected with this end of wire, and distance is therebetween good with 5 ~ 10cm; After installation, utilize the horizontal range between the height of adjacent two shaft towers of laser range finder measurement and two shaft towers and record data, the height setting two shaft towers is respectively H0 and H1, difference in height d=H1-H0, and the horizontal range between two shaft towers is L;

Step S2, to transmission line of electricity energising, the energy that inductive coil senses obtains via wire induction power taking unit, after rectifying and wave-filtering, is stored in storage capacitor, for on-Line Monitor Device is powered;

Step S3, the data measured in step S1 are configured in on-Line Monitor Device by GPRS mode or hand-held set;

The inclination angle r in step S4, the relative level face, obliquity sensor measure traverse line one end utilized in on-Line Monitor Device, the slope k=tan (r) of this point, above-mentioned wire one end refers to the one end near on-Line Monitor Device installation site;

Microcontroller in step S5, on-Line Monitor Device adopts following sag computing method to calculate the height of wire minimum point apart from ground:

Step S5.1, with the wire between adjacent two shaft towers apart from ground minimum point for initial point sets up x-y coordinate system;

Step S5.2, get 1 C point on wire for object carry out force analysis, the acquisition C point pulling force T that bears and horizontal stress H by appointing;

The tie point of step S5.3, setting wire and two shaft towers is respectively A (X0, Y0), B (X1, Y1), wire is true origin apart from ground minimum point, be set to O point, O point coordinate is (0,0), and A point shaft tower height is H0, B point shaft tower height is H1, between two shaft towers, horizontal range is L, and the difference in height between two shaft towers is that d, A, B, O point are all on curve;

According to theory of mechanics, to Fig. 1 march line analysis.Suppose that transmission pressure is flexible and even density.As Fig. 1, carry out mechanical analysis at C point, make electric wire C point and horizontal plane angle be θ here, have:

T*sin(θ)＝mg；

T*cos(θ)＝H；

To any point C on wire, have:

Mg=ρ * s, wherein, m is wire quality, and ρ is gravity suffered by conductor, and s is the length of wire point from coordinate axis initial point to C, i.e. the length of this section lead;

Have: $ds=\sqrt{1+{\left(\frac{dy}{dx}\right)}^2}*dx\&RightArrow;s=\&Integral;\sqrt{1+{\left(\frac{dy}{dx}\right)}^2}*dx$

$\frac{dy}{dx}=\frac{mg}{H}=\frac{\mathrm{\&rho;}s}{H}=\frac{\mathrm{\&rho;}}{H}\&Integral;\sqrt{1+{\left(\frac{dy}{dx}\right)}^2}*dx\mathrm{...}\left(1\right);$

To formula (1), order :

$P^{\&prime;}=\frac{\mathrm{\&rho;}}{H}\sqrt{1+P^2}\mathrm{...}\left(2\right)$

Formula (2) is quadratured:

$\&Integral;\frac{dP}{\sqrt{1+P^2}}=\&Integral;\frac{\mathrm{\&rho;}}{H}dx\&RightArrow;\ln \left(P+\sqrt{1+P^2}\right)=\frac{\mathrm{\&rho;}x}{H}+C\mathrm{...}\left(3\right)$

Due to as x=0, P=0, therefore C=0 in formula (3), therefore:

$\&Integral;\frac{dP}{\sqrt{1+P^2}}=\&Integral;\frac{\mathrm{\&rho;}}{H}dx\&RightArrow;\ln \left(P+\sqrt{1+P^2}\right)=\frac{\mathrm{\&rho;}x}{H}\mathrm{...}\left(4\right)$

$\&DoubleRightArrow;P=(e^{\frac{\mathrm{\&rho;}x}{H}}-e^{-\frac{\mathrm{\&rho;}x}{H}})/2=\frac{dy}{dx}$

$\&DoubleRightArrow;y=\frac{1}{2}\underset{0}{\overset{x}{\&Integral;}}(e^{\frac{\mathrm{\&rho;}x}{H}}-e^{-\frac{\mathrm{\&rho;}x}{H}})dx=\frac{H}{2\mathrm{\&rho;}}\left(e^{\frac{\mathrm{\&rho;}x}{H}}+e^{-\frac{\mathrm{\&rho;}x}{H}}\right)+C\mathrm{1...}\left(5\right)$

(x=0, y=0) is substituted into formula (5) to obtain:

Therefore: order :

$y=\frac{1}{2a}(e^{ax}+e^{-ax})-\frac{1}{a}\mathrm{...}\left(6\right)$

Wherein: ρ is gravity suffered by conductor, e is natural constant, and s is that wire is taken up an official post from coordinate axis initial point to wire and got the length of 1 C point, and this function is about y-axis symmetry, and C1 is a constant.

Try to achieve the function expression of wire shape, this function expression is catenary equation.

Then according to above-mentioned equation model, the value of trying to achieve unknown quantity a is calculated.

The coefficient a of catenary equation is analyzed.The roughly span of a is discussed.As also shown in e.g. figs. 4-7, be a=0.000001 respectively; A=0.00001; A=0.0001; The catenary shape of a=0.02.Can find out, as a=0.000001, when x=200 rice, y=0.02 rice, that is, is reflected on transmission line of electricity, electric wire is O point apart from ground minimum point, and any point on the electric wire so within distance O point 200 meters and the vertical range of O point are no more than two centimetres.As two at a distance of the contour shaft tower of 400 meters, its sag is only 2cm, and obviously this is an almost impossible thing, so can determine, under normal circumstances, the value of a is greater than 0.000001.Can find out according to Fig. 4 ~ 7, a value is larger, and its sag increase is faster.As a=0.2, analyze according to Matlab, as shown in Figure 7, when x=10 rice, y=14 rice, that is, be reflected on transmission line of electricity, electric wire is O point apart from ground minimum point, and any point on the electric wire so beyond distance O point 10 meters and the vertical range of O point are greater than 14 meters.As two at a distance of the contour shaft tower of 20 meters, its sag has reached 14 meters, obviously this is also individual almost impossible thing, at this moment the inclination angle that obliquity sensor is measured has reached more than 60 °, it is abnormal that remote server can analyze conducting wire sag, so can determine, under normal circumstances, the value of a is less than 0.2.According to above-mentioned analysis, can determine, the value one of a fixes between 0.000001 ~ 0.2, and a has and only has a value to meet the requirements.

Next step, the concrete exact value calculating a.On-Line Monitor Device is arranged on the position near B point, and the inclination angle that obliquity sensor measurement obtains B point is r, and slope is that k=tan (r), r can measure and draw, is known quantity.

According to $y=\frac{1}{2a}(e^{ax}+e^{-ax})-\frac{1}{a}\mathrm{...}\left(6\right)$ List equation:

$Y0=\frac{1}{2a}(e^{aX0}+e^{-aX0})-\frac{1}{a}\mathrm{...}<1>$

$Y1=\frac{1}{2a}(e^{aX1}+e^{-aX1})-\frac{1}{a}\mathrm{...}<2>$

$k=\frac{1}{2}(e^{aX1}-e^{-aX1})\mathrm{...}<3>$

X1-X0＝L...................................................<4>

Y1-Y0＝d.....................................................<5>

Visible, 5 unknown numbers X0, X1, Y0, Y1, a, 5 equations.

Obtained by formula <3>:

k is known quantity, therefore e ^aX1numerical value be also known,

Make e ^aX1=P; The numerical value of P is known.

Formula <2> and formula <1> subtracts each other, $Y1-Y0\frac{1}{2a}(e^{aX0}-e^{aX1}+e^{-aX0}-e^{-aX1})=d,$

Therefore,

e ^aX1＝P................②

X0＝X1-L..................③

Wushu is 2., 1. 3. formula substitute into formula, and abbreviation obtains:

$2ad=P+\frac{1}{P}-\frac{e^{al}}{P}-{\mathrm{Pe}}^{-al}\mathrm{...}<6>$

To formula <6> only containing a unknown number a.

Order $f\left(a\right)=P+\frac{1}{P}-\frac{e^{al}}{P}-{\mathrm{Pe}}^{-al}-2ad\mathrm{...}<7>$

Ask the value of a during f (a)=0.

$f^{\&prime;}\left(a\right)=\frac{P1}{e^{al}}-\frac{{\mathrm{Le}}^{al}}{P}-2d$

Clearly find out f'(a) be a subtraction function and have a zero point.

So f (a) is one first increase rear subtraction function.In fact f (a) is a catenary equation that Open Side Down.

A=0 is substituted into <7> formula, obtains f (0)=0.

According to discussing before, in reality, the value of a is in interval (0.000001,0.2), and f (a) is a catenary equation that Open Side Down.A solution of A is 0, and another solution is between (0.000001,0.2), and f (a) is a catenary that Open Side Down, therefore: have and only have an a in (0.000001,0.2) interval, meeting f (a)=0.Analyze f (a) figure with Matlab, as Fig. 9, catenary and true origin have an intersection point, and have another intersection point F with x-axis positive axis, the value of F is between 0.000001 ~ 0.2.

By the function of solving an equation of Matlab in interval in (0.000001,0.2), solve a value during f (a)=0.Or try to achieve accurate a value by C language successive iteration method.

By formula can in the hope of X1.

X1 is substituted into catenary equation, can in the hope of Y1:

$Y1=\frac{1}{2a}(e^{aX1}+e^{-aX1})-\frac{1}{a};$

The practical significance of Y1 is: the vertical range of the tie point of wire minimum point (true origin) distance shaft tower and wire.

The height D1=H1 – Y1 on wire minimum point and ground.

Electric wire curve between two shaft towers meets equation: now, a is obtained, and is known quantity.

GPS module in step S6, on-Line Monitor Device gathers the positional information of on-Line Monitor Device, then the sag information obtained in positional information and step S5, equation parameter, obliquity information are formed a Frame by on-Line Monitor Device, be sent to remote server or internet by GPRS mode, above-mentioned sag information comprises wire minimum point respectively apart from the vertical range on the vertical range of the tie point of two shaft towers and wire, shaft tower top that the height of wire minimum point in the height and wire minimum point distance two shaft towers on ground is higher.

In step S1, the horizontal range between adjacent two shaft towers is 30 meters ~ 1500 meters.

In step S3, the data measured in step S1 are configured in on-Line Monitor Device by GPRS mode: the device numbering of two shaft tower altitude informations, horizontal range and the on-Line Monitor Device measured in step S1 transfers in remote server by GPRS mode by laser range finder, on-Line Monitor Device intermittent, as every 10 minutes, 1 hour or set time section, access remote server, according to device numbering to remote server request two shaft tower horizontal range and elevation information, write in the EEPROM of self after obtaining data.

In step S3, the data measured in step S1 are configured in on-Line Monitor Device by hand-held set, adopt following two kinds of modes: technician inputs two shaft tower height and horizontal range information in hand-held set; Or hand-held set access remote server obtains above-mentioned information, technician is positioned at and is less than 30 meters of scopes carries out manual radio configuration shaft tower height and horizontal range information apart from on-Line Monitor Device.

In step S4, the inclination angle scope utilizing the relative level face, obliquity sensor measure traverse line one end in on-Line Monitor Device is-60 ° ~+60 °, measurement of dip angle degree of accuracy is 0.03 °, and this precision can meet the error of maximum 2% of national sag measurement standard regulation.

Remote server sets up 3 dimensional drawing according to the data in step S6 in conjunction with map software, carries out more detailed analysis.

The above is the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; any those skilled in the art of being familiar with are not deviating under Spirit Essence of the present invention and principle; above-described embodiment is changed, modifies, substitutes, combines, simplified, is included within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.

Claims (10)

1. a power transmission line sag on-line monitoring method, is characterized in that: it comprises the following steps:

On-Line Monitor Device installed by step S1, wire between adjacent two shaft towers, and one of them in two shaft towers of this on-Line Monitor Device, after installation, utilize the horizontal range between the vertical range on adjacent two shaft tower top to the ground of laser range finder measurement and two shaft towers and record data;

Step S2, to transmission line of electricity energising, on-Line Monitor Device adopt wire mutual inductance get can power supply mode;

Step S3, the data measured in step S1 are configured in on-Line Monitor Device by GPRS mode or hand-held set;

The inclination angle in step S4, the relative level face, obliquity sensor measure traverse line one end utilized in on-Line Monitor Device, the tangent value at inclination angle is the slope of this point, and above-mentioned wire one end refers to the one end near on-Line Monitor Device installation site;

Microcontroller in step S5, on-Line Monitor Device adopts following sag computing method to calculate the height of wire minimum point apart from ground: with the wire distance ground minimum point between adjacent two shaft towers for initial point sets up x-y coordinate system, obtain the catenary equation of wire; Measure the slope of the wire one end obtained and above-mentioned Catenary equation of line strung according in the horizontal range data between the height of two shaft towers measured in step S1 and two shaft towers, step S4, obtain the vertical range on the sag equation of the transmission line of electricity between two shaft towers and the higher shaft tower top of the height of wire minimum point in two shaft towers;

GPS module in step S6, on-Line Monitor Device gathers the positional information of on-Line Monitor Device, then the sag information obtained in positional information and step S5, equation parameter, obliquity information are formed a Frame by on-Line Monitor Device, are sent to remote server or internet by GPRS mode.

2. power transmission line sag on-line monitoring method according to claim 1, it is characterized in that: in step S1, on-Line Monitor Device is installed in the wherein one end at the wire two ends between adjacent two shaft towers, and on-Line Monitor Device is near the shaft tower be connected with this end of wire, distance is therebetween with 5 ~ 10cm.

3. power transmission line sag on-line monitoring method according to claim 1, is characterized in that: in step S1, and the horizontal range between adjacent two shaft towers is 30 meters ~ 1500 meters.

4. power transmission line sag on-line monitoring method according to claim 1, it is characterized in that: in step S3, the data measured in step S1 are configured in on-Line Monitor Device by GPRS mode: the device numbering of two shaft tower altitude informations, horizontal range and the on-Line Monitor Device measured in step S1 transfers in remote server by GPRS mode by laser range finder, on-Line Monitor Device intermittent access remote server, according to device numbering to remote server request two shaft tower horizontal range and elevation information, write in the EEPROM of self after obtaining data.

5. power transmission line sag on-line monitoring method according to claim 1, it is characterized in that: in step S3, the data measured in step S1 are configured in on-Line Monitor Device by hand-held set, adopts following two kinds of modes: technician inputs two shaft tower height and horizontal range information in hand-held set; Or hand-held set access remote server obtains above-mentioned information, technician is positioned at and is less than 30 meters of scopes carries out manual radio configuration shaft tower height and horizontal range information apart from on-Line Monitor Device.

6. power transmission line sag on-line monitoring method according to claim 1, is characterized in that: in step S4, and the inclination angle scope utilizing the relative level face, obliquity sensor measure traverse line one end in on-Line Monitor Device is-60 ° ~+60 °.

7. power transmission line sag on-line monitoring method according to claim 1, is characterized in that: the catenary equation in step S5 comprises the following steps:

Step S5.1, with the wire between adjacent two shaft towers apart from ground minimum point for initial point sets up x-y coordinate system;

Step S5.2, by appoint get on wire a bit for object carries out force analysis, obtain this some pulling force T that bears and horizontal stress H;

Step S5.3, math equation according to wire between two shaft towers:

Wherein, ρ is gravity suffered by conductor, and e is natural constant; After setting up x-y coordinate system,

Obtain the catenary equation of wire:

Wherein, a is catenary coefficient, and the value of a is 0.000001 ~ 0.2.

8. power transmission line sag on-line monitoring method according to claim 1, is characterized in that: remote server sets up 3 dimensional drawing according to the data in step S6 in conjunction with map software, carries out more detailed analysis.

9. a power transmission line sag on-Line Monitor Device, it is characterized in that: it stationary installation comprising on-Line Monitor Device housing and be fixed on transmission line of electricity, stationary installation comprises two semicircle siliconized plates, two semicircle siliconized plate two ends connect to form an annular siliconized plate by web member, the internal diameter of annular siliconized plate equals power line conductive linear diameter, and annular siliconized plate is wound with inductive coil, on-Line Monitor Device housing is arranged on the securing means, microcontroller is provided with in housing, obliquity sensor, storer, power module, GPRS wireless communication module, GPS module and ZigBee wireless module, microcontroller by wire respectively with obliquity sensor, storer, power module, GPRS wireless communication module, GPS module is connected with ZigBee wireless module, the power module of powering for above-mentioned all parts comprises the wire induction power taking unit be electrically connected successively, rectification filtering module and storage capacitor, wire induction power taking unit is connected with the inductive coil that annular siliconized plate is wound around.

10. power transmission line sag on-line monitoring method according to claim 9, is characterized in that: its silicon steel material is specifically selected according to the electric current on wire.The number of turns of inductive coil determines according to on-Line Monitor Device maximum power dissipation and wire average current, and on-Line Monitor Device requires that on transmission line of electricity, minimum working current is 20A.