CN203501999U - Power transmission line sag on-line monitoring device - Google Patents

Abstract

Provided is a power transmission line sag on-line monitoring device, including an on-site monitoring terminal, a data center and a work station. The monitoring terminal includes a double-shaft angle sensor used for measuring a hitch point power transmission line lead inclination angle, i.e., an angle between a lead tangent direction and a horizontal direction. A communication module employs a GPRS communication mode to transmit measured data to the data center; the data center obtains a line sag value in dependence on power transmission line structure parameters and the hitch point power transmission line lead inclination angle through a catenary sag calculating method. The work station is mainly used for completing the setting of a monitoring system, the query of monitoring information, the query and analysis of sag measuring results and control and arrangement of an on-site terminal. The Power transmission line sag on-line monitoring device has the good characteristics of high measuring precision, simple measuring method, easy installation, low cost and real time on-line measuring performance and overcomes the defects of prior arts.

Description

A kind of transmission line of electricity sag on-Line Monitor Device

Affiliated technical field

The utility model belongs to transmission line of electricity Real-Time Monitoring field, relate in particular to a kind of on-line monitoring method of transmission line of electricity sag, being mainly used for solving traditional artificial sag measuring method exists error large, waste time and energy and can not, for problem and the modern sag measuring method of Real-Time Monitoring, based on tension pick-up, the measurement of conductor temperature sag and image sag, measure the on-the-spot problems such as exploitativeness is more difficult, measuring accuracy is low of installing that exist.

Background technology

Transmission line of electricity sag is one of key index of line security operation, due to transmission line of electricity sag and operating load with around weather environment is closely related, the variation of any factor all may cause the variation of circuit, the excessive sag hidden danger that not only can cause the accident, also can reduce the thermal capacity of transmission line of electricity, limited the transport capacity of circuit, economy and the security of circuit operation have been had to vital impact.

Sag measurement is divided into traditional sag observation method and modern method of real-time.The built on stilts arc sag of wire of power transmission line of observation or the conventional method of ground wire sag generally have abnormal method, etc. regular way, preset angle configuration and look squarely four kinds of methods.Ordinary priority such as selects at regular way or the abnormal method.When being subject to the regular ways such as objective condition restriction can not adopt or abnormal method, can select preset angle configuration.In the time of only can not using above-mentioned three kinds of methods, just adopt the method for looking squarely.Tradition sag monitoring method needs manual measurement, and preset angle configuration can only survey an angle and just calculate sag, but when being partially applied to erection of elevated power lines manual measurement, so can not be for Real-Time Monitoring.

Modern sag method of real-time mainly contains three kinds, by conductor temperature, is estimated sag, parabolic equation computing method based on tension pick-up and is directly measured sag by image.The principle of conductor temperature estimation sag is the temperature that first measures circuit, then the state equation by circuit carrys out calculated level stress, utilize afterwards the relation between horizontal stress and sag to calculate line-sag, subject matter is because wind speed variation along the line is larger, cause conductor temperature variation along the line larger, and may there is relatively large deviation with actual value in the temperature estimation sag that measures wire point, the temperature that temperature sensor measures is in addition conductive line surfaces temperature, also can cause measurements and calculations error with the temperature spread of the inner steel core of wire.The principle of the parabolic equation computing method based on tension pick-up is by parabolic equation, to calculate sag size again by installation tension sensor measurement wire axial tensile force between shaft tower and insulator, subject matter is cumbersome at conductor wire end installation tension sensor, and system power supply problem is difficult to solve well; In addition, although calculating sag, parabolic equation relatively simply there is the shortcoming that error is larger.Directly by high precision image, differentiating camera, to measure the principle of sag be by hang a target on wire, with the coordinate figure of target in camera pickup image, calculate line-sag, the method has proposed very high requirement to the sensitivity of camera, need camera even can work evening under any light, such camera is inevitable very expensive, simultaneously out of doors under mal-condition, so the reliability of high precision camera also can reduce.

According to application present situation and defect analysis to current similar technology, know, traditional sag measuring method is manual measurement, and amount error is large, wastes time and energy and can not be for Real-Time Monitoring; In modern sag measuring method, although the relative conductor temperature sag of sag monitoring method based on tension pick-up is measured and measurements of image sag has the feature of degree of precision, on-the-spot installation exploitativeness is more difficult and the electric property of tension pick-up is had relatively high expectations.

Summary of the invention

Deficiency for existing in traditional sag measurement and existing sag on-line monitoring technique, the utility model proposes a kind of transmission line of electricity sag on-Line Monitor Device.Field monitoring terminal is set on transmission line of electricity, and built-in double-shaft tilt angle sensor, measures hitch point transmission line wire inclination angle.According to hitch point transmission line wire inclination angle and other transmission line of electricity known structure parameter, utilize the sag computational algorithm proposing based on transmission line of electricity catenary construction state equation, directly calculate conducting wire sag value, possess real-time online function.

The utility model solves the technical scheme that its technical matters adopts:

On high-voltage conducting wires, shaft tower adjacent end arranges an on-Line Monitor Device, and on-Line Monitor Device comprises a field monitoring terminal, a data center, and a workstation.

Field monitoring terminal is arranged on transmission line of electricity in arbitrary span, comprises a built-in double-shaft tilt angle sensor, an electric supply system, an embedded system and a communication module.Double-shaft tilt angle sensor is measured hitch point transmission line wire inclination angle, the i.e. angle of transmission line of electricity tangential direction and horizontal direction; Electric supply system is double-shaft tilt angle sensor, embedded system and communication module power supply; Embedded system receives hitch point transmission line of electricity inclination angle, and filtering, computing are done in hitch point transmission line of electricity inclination angle; Communication module adopts GPRS communication mode that the hitch point transmission line of electricity inclination angle of processing through embedded system is sent to described data center.

Data center comprises a database, and data center is by the transmission line structure parameter of real time on-line monitoring and transmission line wire obliquity information in the lump input database.

Workstation completes the foundation setting of monitoring system, the inquiry and analysis of the inquiry of monitoring information, sag measurement result and the control setting to on-site terminal.

Sag computing method are the Numerical method based on catenary sag model, and wherein this transmission line structure parameter comprises the difference in height at span, transmission pressure line density, transmission line of electricity two ends.

A kind of transmission line of electricity sag on-Line Monitor Device that this patent proposes, the hitch point transmission line wire inclination angle of measuring according to double-shaft tilt angle sensor, utilizes the Numerical method based on catenary sag model to calculate line-sag value.Compared with prior art, this sag monitoring method has that measuring accuracy is high, measuring method is simple, be easy to install, with low cost and possess the good characteristics of real-time online ability etc.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the utility model is further illustrated.

Fig. 1 is transmission line of electricity sag on-line monitoring structural representation.

Fig. 2 is transmission line of electricity sag on-Line Monitor Device field monitoring terminal scheme of installation.

Fig. 3 is field monitoring terminal structure schematic diagram.

Fig. 4 is that catenary sag calculated load is uniformly distributed schematic diagram along wire length.

In Fig. 2,1. transmission pressure, 2. monitoring terminal, 3. transmission tower, 4. wire inclination angle.

Embodiment

In Fig. 1, field monitoring terminal distributing installation, can Real-time Collection hitch point transmission line wire inclination angle and upload to data center on transmission line of electricity in upper arbitrary span; Data center is by the communication module of field monitoring terminal, receive the monitoring information uploaded and under pass relevant control information, communication module adopts GPRS communication mode.Data center is calculated uploading data Data Enter database for sag; Workstation is distributed in each management office, is the window of system man-machine interaction, mainly completes the foundation setting of monitoring system, the inquiry and analysis of the inquiry of monitoring information, sag measurement result and to tasks such as the control of on-site terminal arrange.

In Fig. 2, the mounting points of monitoring terminal [2] is positioned near the junction of shaft tower [3] and transmission pressure [1] and near shaft tower position end.Transmission line wire inclination angle [4] is the angle of transmission line of electricity left end tangential direction and horizontal direction, because monitoring terminal actual installation position and shaft tower and transmission line of electricity junction have certain displacement, in catenary sag computational algorithm, add this side-play amount, sag is revised, reduced the error of calculation.

In Fig. 3, field monitoring terminal is comprised of double-shaft tilt angle sensor, power supply, embedded system and communication module four major parts.Double-shaft tilt angle sensor sends the wire inclination angle collecting to embedded system, embedded system receives the data that double-shaft tilt angle sensor sends, and data are done a series of processing such as filtering, calculating finally by this data transmission to communication module, communication module completes reception and the transmission of data, and this transmission line wire inclination angle is sent to data center.The work of described modules is responsible for power supply by power supply, for field monitoring terminal provides electric energy.

The data center of transmission line of electricity sag on-Line Monitor Device is connected with communication module, and the hitch point transmission line wire inclination angle of received communication module transmission.This data center comprises a database, and data center is the transmission line structure parameter of real time on-line monitoring and transmission pressure obliquity information in the lump input database, and calculates line-sag value by the Numerical method based on catenary sag model.Wherein this transmission line structure parameter comprises the difference in height at span, transmission pressure line density, transmission line of electricity two ends.This transmission line structure parameter can, by simply measuring, not repeat them here.

Sag computing method are the Numerical method based on catenary sag model, and concrete implementation step is as described below:

In Fig. 4, load calculates for catenary sag along the long uniform schematic diagram of wire, and these computing method are based upon in catenary equation theoretical foundation.Its analytic method is: first according to the sag Horizontal Tension H that derives to obtain from parabolic equation _p, then based on catenary equation, at H _pin field, search obtains the Horizontal Tension H under catenary equation _x, the catenary equation sag computing formula finally obtaining according to derivation calculates the maximum sag of wire.

The suffered self gravitation of power transmission line is uniform along transmission of electricity line length s direction, and c is shaft tower two ends differences in height, and l is shaft tower span, and wire left end point place wire tangential direction and horizontal angle are double-shaft tilt angle sensor measured value use, and s direction uniformly distributed load is q ₀, have:

q ₀ds＝q _ydx (1)

Therefore,

$q_y=q_0\frac{\mathrm{ds}}{\mathrm{dx}}=q_0\sqrt{1+{\left(\frac{\mathrm{dy}}{\mathrm{dx}}\right)}^2}---\left(2\right)$

Formula (2) is updated to equation (1) to be obtained

$H\frac{d^2\mathrm{<figure-callout\; id="2"\; label="y\; dx"\; filenames="HSA0000092707330000012.png"\; state="\{\{state\}\}">y</figure-callout>}}{{\mathrm{dx}}^{}}+q_0\sqrt{1+{\left(\frac{\mathrm{dy}}{\mathrm{dx}}\right)}^2}=0---\left(3\right)$

Solving the solution that can be met boundary condition shown in Fig. 4 is:

$y=\frac{H}{q_0}[\cosh \mathrm{\&alpha;}-\cosh (\frac{2\mathrm{\&beta;x}}{l}-\mathrm{\&alpha;})]---\left(4\right)$

Wherein

$\mathrm{\&alpha;}={\sinh }^{-1}\left[\frac{\mathrm{\&beta;}\left(\mathrm{cl}\right)}{\sinh \mathrm{\&beta;}}\right]+\mathrm{\&beta;},\mathrm{\&beta;}=\frac{q_{0}l}{2H}---\left(5\right)$

The curve of equation (5) representative is gang's catenary, if the coordinate figure of any point on given curve, whole piece curve can be completely definite.

Adopt mathematica software to ask first order derivative to catenary equation (5), obtain the slope at catenary each point place

$y^{\&prime;}\left(x\right)=\sinh (\frac{{\mathrm{lq}}_0}{2H}-\frac{q_{0}x}{H}+a\sinh \left(\frac{{\mathrm{cq}}_0}{2H\sinh \left({\mathrm{lq}}_{0}2H\right)}\right))---\left(6\right)$

At x=0 place, i.e. wire left end place, the slope of catenary is:

$y^{\&prime;}(x=0)=\sinh [\frac{{\mathrm{lq}}_0}{2H}+a\sinh [\frac{{\mathrm{cq}}_0}{2H\sinh \left({\mathrm{lq}}_{0}2H\right)}\left]\right]---\left(7\right)$

According to the definition of slope, have:

$\tan {\mathrm{\&alpha;}}_1=y^{\&prime;}(x=0)\sinh [\frac{{\mathrm{lq}}_0}{2H}+a\sinh [\frac{{\mathrm{cq}}_0}{2H\sinh \left({\mathrm{lq}}_{0}2H\right)}\left]\right]---\left(8\right)$

The difference in height c at wire two ends, span l and along the uniformly distributed load q of arc length s direction ₀be line construction parameter as known quantity, transmission line wire inclination alpha ₁for measured value.According to formula (8), by numerical evaluation, try to achieve the value of Horizontal Tension H, so definite catenary equation (5) just can calculate the sag of any point on transmission pressure, as shown in formula (9).

$f\left(x\right)=\frac{H}{q_0}[\cosh \mathrm{\&alpha;}-\cosh (\frac{2\mathrm{\&beta;x}}{l}-\mathrm{\&alpha;})]-\frac{c}{l}x---\left(9\right)$

Claims (5)

1. a transmission line of electricity sag on-Line Monitor Device, is characterized in that, this device comprises:

One field monitoring terminal, this field monitoring terminal comprises a double-shaft tilt angle sensor, one electric supply system, an embedded system and a communication module, it is the angle of transmission line of electricity tangential direction and horizontal direction that described double-shaft tilt angle sensor is measured hitch point transmission line wire inclination angle; One data center, this data center is according to transmission line structure parameter and hitch point transmission line wire inclination angle, and the Numerical method based on catenary sag model calculates line-sag value; One workstation.

2. a kind of transmission line of electricity sag on-Line Monitor Device according to claim 1, is characterized in that: described electric supply system is double-shaft tilt angle sensor, embedded system and communication module power supply; Described embedded system receives hitch point transmission line wire inclination angle, and filtering, computing are done in described hitch point transmission line of electricity inclination angle; Described communication module adopts GPRS communication mode that the hitch point transmission line wire inclination angle of processing through embedded system is sent to described data center.

3. a kind of transmission line of electricity sag on-Line Monitor Device according to claim 1, is characterized in that: described data center also comprises a database, and described database receives transmission line structure parameter and hitch point transmission line wire inclination angle.

4. a kind of transmission line of electricity sag on-Line Monitor Device according to claim 1, is characterized in that: described workstation completes the foundation setting of monitoring system, the inquiry and analysis of the inquiry of monitoring information, sag measurement result and the control setting to on-site terminal.

5. a kind of transmission line of electricity sag on-Line Monitor Device according to claim 1, is characterized in that: described sag computing method are the Numerical method based on catenary equation.

Images