CN102768029B - Method and device for industrial control by aid of sag monitoring - Google Patents
Method and device for industrial control by aid of sag monitoring Download PDFInfo
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- CN102768029B CN102768029B CN201210258753.3A CN201210258753A CN102768029B CN 102768029 B CN102768029 B CN 102768029B CN 201210258753 A CN201210258753 A CN 201210258753A CN 102768029 B CN102768029 B CN 102768029B
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- 238000013461 design Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 5
- 230000002500 effect on skin Effects 0.000 claims description 3
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Abstract
The invention discloses a method for industrial control by the aid of sag monitoring. The method includes building a temperature field model of a power transmission line according to various parameters affecting a temperature field of the power transmission line; obtaining numerical values of the parameters; computing temperature values of the power transmission line; computing sag values of the power transmission line; and carrying out industrial control according to the computed sag values of the power transmission line. The invention further discloses a device for industrial control by the aid of sag monitoring. The temperature field model of the power transmission line is built according to the parameters affecting the temperature field of the power transmission line. Equipment does not need to be additionally mounted on the power transmission line when the temperature values of the power transmission line are computed. The sag values of the power transmission line can be further computed and the industrial control can be carried out according to the computed temperature values. The total power transmission line can be monitored and controlled when the sag monitoring and the industrial control are carried out due to the fact that cost for mounting the monitoring equipment on the power transmission line is saved.
Description
Technical field
The present invention relates to the sag monitoring technical field of transmission line of electricity, particularly relate to and a kind ofly carry out the method for Industry Control by sag monitoring and a kind ofly carry out the device of Industry Control by sag monitoring.
Background technology
Sag is one of important indicator of multi-line power transmission equipment operation maintenance, and its size is directly connected to the safe and stable operation of transmission line of electricity.Transmission line of electricity, owing to undergo the impact of the weather conditions such as occurring in nature icing, temperature rise and wind for a long time, makes its sag larger change can correspondingly occur.Further, due in recent years due to power load increase needs, the highest for transmission line of electricity operation allowable temperature, in order to improve transport capacity, has been brought up to 80 DEG C from 70 DEG C by many existing transmission lines of electricity.In this case, the sag of transmission line of electricity just becomes main restraining factors.In sum, need to carry out Real-Time Monitoring to the sag of transmission line of electricity, use it for Industry Control, to guarantee safe operation of electric network.
What often use in recent years mainly contains the method that sag carries out on-line monitoring: by monitoring conductor temperature calculate sag method, by measuring the method for hitch point inclination angle estimation sag and being calculated the method etc. of sag by shooting observation shelves image.These ways need on transmission line of electricity, install the equipment such as corresponding measuring sensor or shooting camera, because the input of these equipment is often comparatively large, cannot realize monitoring completely.Also namely can only accomplish optionally to monitor the sag of transmission line of electricity, the effective range of Industry Control is restricted, and is unfavorable for comprehensive monitoring and the control of electric power netting safe running.
Summary of the invention
Based on this, the invention provides and a kind ofly carry out the method for Industry Control by sag monitoring and a kind ofly carry out the device of Industry Control by sag monitoring.
Carried out a method for Industry Control by sag monitoring, comprise the following steps:
According to the parameters affecting temperature of electric transmission line field, set up the models for temperature field of transmission line of electricity;
Obtain the described numerical value affecting the parameters of temperature of electric transmission line field;
According to the numerical value of described parameters obtained and the described models for temperature field of foundation, the temperature value of computing electric power line;
According to the described temperature value calculated, calculated the sag of described transmission line of electricity by transmission line status equation; Wherein, any point sag f on transmission line of electricity
xadopt as declivity parabolic formula calculates:
Wherein, l is the span of each shelves in transmission line of electricity; γ is that comprise and carry from anharmonic ratio, wind pressure ratio is carried with icing than carrying comprehensively than carrying in circuit unit level projected length; σ
0for with than carrying the perpendicular meridional stress component of active line, also claim horizontal stress, its value is identical everywhere at each point of electric wire, wherein σ
0calculating relevant with temperature value; H is the wire hitch point discrepancy in elevation; β is each shelves pole line hitch point height difference angle in transmission line of electricity, wherein β=arctan (h/l);
Sag according to the described transmission line of electricity calculated carries out Industry Control.
Compared with general technology, the present invention carries out the method for Industry Control by sag monitoring, by affecting the parameters of temperature of electric transmission line field, establishes the models for temperature field of transmission line of electricity.Because the numerical value affecting the parameters of temperature of electric transmission line field obtains by existing operation of power networks control system, therefore do not need additionally erecting equipment on transmission line of electricity when computing electric power line temperature value.According to the temperature value calculated, can further computing electric power line sag and utilize sag to carry out Industry Control.When carrying out sag monitoring and Industry Control by the present invention, owing to saving the cost installing monitoring equipment on transmission line of electricity, all fronts monitor and forecast of transmission line of electricity can be realized.
Carried out a device for Industry Control by sag monitoring, comprise model building module, parameter values acquisition module, temperature value computing module, sag monitoring modular and industrial control module;
Described model building module, for according to the parameters affecting temperature of electric transmission line field, sets up the models for temperature field of transmission line of electricity;
Described parameter values acquisition module, for obtaining the described numerical value affecting the parameters of temperature of electric transmission line field;
Described temperature value computing module, for according to obtain the numerical value of described parameters and the described models for temperature field of foundation, the temperature value of computing electric power line;
Described sag monitoring modular, for according to the described temperature value calculated, calculates the sag of described transmission line of electricity by transmission line status equation; Wherein, any point sag f on transmission line of electricity
xadopt as declivity parabolic formula calculates:
Wherein, l is the span of each shelves in transmission line of electricity; γ is that comprise and carry from anharmonic ratio, wind pressure ratio is carried with icing than carrying comprehensively than carrying in circuit unit level projected length; σ
0for with than carrying the perpendicular meridional stress component of active line, also claim horizontal stress, its value is identical everywhere at each point of electric wire, wherein σ
0calculating relevant with temperature value; H is the wire hitch point discrepancy in elevation; β is each shelves pole line hitch point height difference angle in transmission line of electricity, wherein β=arctan (h/l);
Described industrial control module, for carrying out Industry Control according to the sag of the described transmission line of electricity calculated.
Compared with general technology, the present invention carries out the device of Industry Control by sag monitoring, by affecting the parameters of temperature of electric transmission line field, establishes the models for temperature field of transmission line of electricity.Because the numerical value affecting the parameters of temperature of electric transmission line field obtains by existing operation of power networks control system, therefore do not need additionally erecting equipment on transmission line of electricity when computing electric power line temperature value.According to the temperature value calculated, can further computing electric power line sag and utilize sag to carry out Industry Control.When carrying out sag monitoring and Industry Control by the present invention, owing to saving the cost installing monitoring equipment on transmission line of electricity, all fronts monitor and forecast of transmission line of electricity can be realized.
Accompanying drawing explanation
Fig. 1 is that the present invention carries out the schematic flow sheet of the method for Industry Control by sag monitoring;
Fig. 2 is that the present invention carries out the structural representation of the device of Industry Control by sag monitoring.
Embodiment
For further setting forth the technological means that the present invention takes and the effect obtained, below in conjunction with accompanying drawing and preferred embodiment, to technical scheme of the present invention, carry out clear and complete description.
Refer to Fig. 1, for the present invention monitors the schematic flow sheet carrying out the method for Industry Control by sag.The method that the present invention carries out Industry Control by sag monitoring comprises the following steps:
S101, according to the parameters affecting temperature of electric transmission line field, sets up the models for temperature field of transmission line of electricity;
The described parameters affecting temperature of electric transmission line field can comprise in the electric current of transmission line of electricity, voltage, load, model, design sag, the specific heat capacity numerical value of transmission line of electricity material, environment temperature, intensity of solar radiation and wind speed that transmission line of electricity is corresponding one or more.
The loss of electrical equipment by producing during electric current, comprise: the magnetic hysteresis in the ohmic loss of current-carrying pole line (i.e. transmission line of electricity), the dielectric loss of insulating material inside and hardware and eddy current loss etc., these losses make the temperature of electrical equipment raise.
The heat of pole line ohmic loss has:
Wherein,
The heat that pole line absorbs solar radiation has:
Q
t＝E
tA
tD
Pole line heat loss through convection amount has:
Q
d＝α
t(θ
W-θ
0)F
l
Wherein, F
l=π D.
Pole line heat loss through radiation amount has:
Conductor heat conduction and heat radiation amount has:
In above-mentioned formula, K
ffor the skin effect coefficient of pole line, relevant with the shape and size of the frequency of electric current, pole line; I
wfor the electric current that pole line passes through; R
acfor the AC resistance of pole line; θ
wfor pole line temperature; θ
0for surrounding air (environment) temperature; α
tfor Natural Heat Convection coefficient, wherein α
t=1.5 (θ
w-θ
0)
0.35; E
tfor solar radiation power density; A
tfor the absorptivity of pole line; D is the diameter of pole line; F
1for unit length wire area of dissipation, relevant with the factor such as conductor size, arrangement; λ is pole line specific heat capacity coefficient; δ is pole line sub-conductor thickness.
According to conservation of energy principle, during steady state (SS): Q
r+ Q
t=Q
d+ Q
f+ Q
h.Gone out the thermal change of wire by the change calculations of above-mentioned each parameter, thus calculate the temperature rise of wire.The sag of wire can be drawn according to the stress EOS of circuit mechanics according to wire temperature rise.
Analyze in temperature field under various physical environment and loading condiction by the aerial condutor (i.e. transmission line of electricity) to conventional model, utilize Computer Numerical Simulation and site test, find out the specific heat capacity numerical value of the conductor material of common structure, thus the temperature of aerial condutor is accurately calculated.
S102 obtains the described numerical value affecting the parameters of temperature of electric transmission line field;
The numerical value of the parameters affecting temperature of electric transmission line field can be obtained by the mode setting up software systems.Such as set up the software systems comprising basic information system, energy information acquisition system, external information acquisition system and total management system four parts.First three system carries out low level information collecting work, does the COMPREHENSIVE CALCULATING of data and provide various application layer services by COMPREHENSIVE CALCULATING management system.
Basic information system, can provide basic data guarantee.This part can cover equipment account and operation information, such as: the Back ground Informations such as wire type, design sag, safety coefficient, span, measurement sag.This part also can allow user to carry out editor's maintenance work of being correlated with simultaneously, provides effective maintenance interface, can facilitate that operation maintenance personnel is efficient and convenient carries out updating maintenance.
Energy information acquisition system, this part obtains the Real-Time Monitoring information of electrical network by the mode that acquisition interface combines with energy management system (existed system), and the parameter of acquisition can comprise: overhead transmission line real-time current, overhead transmission line real-time voltage and information on load.Be the safe and reliable of guarantee information, can design special SSL encryption system, the information being about to get is encrypted, and is decrypted the mode of process after transmission more simultaneously.
External information acquisition system, this part can adopt the mode of software interface and weather bureau's weather forecast to contact in real time, the weather data that fetching portion is real-time.When there is meteorological department and not carrying out the data detecting or issue, this system also can provide interface to make an inspection tour by each distributed points the acquisition that weather data is carried out at station, the such as meteorologic parameter such as solar radiation, ice covering thickness.
S103 according to obtain the numerical value of described parameters and the described models for temperature field of foundation, the temperature value of computing electric power line;
By Reality simulation overhead transmission line service condition in laboratory, numerical simulation, external environment, multianalysis has been carried out to conductor temperature field, drawn the specific heat capacity data of different model steel-cored aluminium strand by test, such as, analyze and draw the specific heat capacity value evaluation of this sandwich of steel-cored aluminium strand.According to the models for temperature field set up, models for temperature field is carried out numerical simulation calculation by the mode by computer programming.Three-dimensional simulation is carried out to aerial condutor temperature field, obtains each data parameters of temperature environment, sunykatuib analysis is carried out to system model, obtained the accurate temperature data of aerial condutor arbitrfary point by the method for finite element.The sag of aerial condutor can be calculated according to the state equation of overhead power transmission conducting wire after obtaining conductor temperature data accurately.
S104, according to the described temperature value calculated, calculates the sag of described transmission line of electricity;
The sag of described transmission line of electricity is calculated by transmission line status equation.
Any point sag f on transmission line of electricity
xcan adopt as declivity parabolic formula calculates:
Wherein, l is the span of each shelves in transmission line of electricity; γ is that comprise and carry from anharmonic ratio, wind pressure ratio is carried with icing than carrying comprehensively than carrying in circuit unit level projected length; σ
0for with than carrying the perpendicular meridional stress component of active line, also claim horizontal stress, its value is identical everywhere at each point of electric wire, wherein σ
0calculating relevant with the temperature value drawn in step S103; H is the wire hitch point discrepancy in elevation; β is each shelves pole line hitch point height difference angle in transmission line of electricity, wherein β=arctan (h/l).
Such as, according to the software systems comprising basic information system, energy information acquisition system, external information acquisition system and total management system four parts of above-mentioned foundation.Total management system, can contact other three module work, carry out COMPREHENSIVE CALCULATING.According to the data that three system acquisition arrive, total management system can carry out overall treatment to information, i.e. evaluation.Send information according to numerical value situation and carry out decision-making to operations staff, the services such as the statistical study of data and form derivation also can be provided simultaneously.
S105 carries out Industry Control according to the sag of the described transmission line of electricity calculated.
As one of them embodiment, can judge whether the sag of the described transmission line of electricity calculated exceedes default sag scope;
If the sag of described transmission line of electricity has exceeded the sag scope preset, then send the alarm signal of sag over range.
After calculating the sag of described transmission line of electricity, each control field of operation of power networks can be widely used in, as sag monitoring alarm, network load Forecast and control etc.Based on the system software platform that the present invention develops, the real-time sag monitoring to any shelves of any transmission line of electricity can be realized.By the contrast of Real-Time Monitoring sag data and design load or service data, realize the dynamic compatibilization instructing operation of power networks.Any span whole day that simultaneously also can realize any transmission line of electricity is monitored automatically, and exceeding the circuit of operating standard setting as occurred, automatically sending warning, rapid reaction goes out position, is reported to operations staff and processes in time.
Compared with general technology, the present invention carries out the method for Industry Control by sag monitoring, by affecting the parameters of temperature of electric transmission line field, establishes the models for temperature field of transmission line of electricity.Because the numerical value affecting the parameters of temperature of electric transmission line field obtains by existing operation of power networks control system, therefore do not need additionally erecting equipment on transmission line of electricity when computing electric power line temperature value.According to the temperature value calculated, can further computing electric power line sag and utilize sag to carry out Industry Control.When carrying out sag monitoring and Industry Control by the present invention, owing to saving the cost installing monitoring equipment on transmission line of electricity, all fronts monitor and forecast of transmission line of electricity can be realized.
The present invention is without the need to installing a large amount of monitoring elements on aerial condutor (i.e. transmission line of electricity); Do not need hot line job, thus do not affect normal production run.In addition, pilot process desired data is from power network monitoring end, and Data Source is stablized, and without instantaneous mutation, therefore Monitoring Data is more accurate.Present invention is disclosed the relation between temperature and sag, better monitor sag change from the angle outside on-line monitoring.Owing to not needing to install monitoring element, drastically reduce the area investment, be easy to promote and safeguard.The sag Real-Time Monitoring achieving extensive overhead transmission line truly.The present invention can realize the combination with existing production run system, improves property easy to use, effectively reduces the operation easier of operation maintenance personnel, improves the replicability of system.
In addition, a kind of device being carried out Industry Control by sag monitoring is also disclosed.
Refer to Fig. 2, for the present invention monitors the structural representation carrying out the device of Industry Control by sag.The present invention carries out the device of Industry Control by sag monitoring, comprises model building module 201, parameter values acquisition module 202, temperature value computing module 203, sag monitoring modular 204 and industrial control module 205;
Described model building module 201, for according to the parameters affecting temperature of electric transmission line field, sets up the models for temperature field of transmission line of electricity;
The described parameters affecting temperature of electric transmission line field comprise in the electric current of transmission line of electricity, voltage, load, model, design sag, the specific heat capacity numerical value of transmission line of electricity material, environment temperature, intensity of solar radiation and wind speed that transmission line of electricity is corresponding one or more.
Described parameter values acquisition module 202, for obtaining the described numerical value affecting the parameters of temperature of electric transmission line field;
Parameter values acquisition module 202 obtains the numerical value of the parameters affecting temperature of electric transmission line field by the mode of software systems.Such as set up the software systems comprising basic information system, energy information acquisition system, external information acquisition system and total management system four parts.Parameter values acquisition module 202 carries out low level information collecting work by first three system.
Described temperature value computing module 203, for according to obtain the numerical value of described parameters and the described models for temperature field of foundation, the temperature value of computing electric power line;
By Reality simulation overhead transmission line service condition in laboratory examination, numerical simulation, external environment, multianalysis has been carried out to conductor temperature field, drawn the specific heat capacity data of different model steel-cored aluminium strand by test, such as, analyze and draw the specific heat capacity value evaluation of this sandwich of steel-cored aluminium strand.According to the models for temperature field set up, models for temperature field is carried out numerical simulation calculation by the mode by computer programming.Three-dimensional simulation is carried out to aerial condutor temperature field, obtains each data parameters of temperature environment, sunykatuib analysis is carried out to system model, obtained the accurate temperature data of aerial condutor arbitrfary point by the method for finite element.Temperature value computing module 203 can calculate the sag of aerial condutor after obtaining conductor temperature data accurately according to the state equation of overhead power transmission conducting wire.
Described sag monitoring modular 204, for according to the described temperature value calculated, calculates the sag of described transmission line of electricity;
Described sag monitoring modular calculates the sag of described transmission line of electricity by transmission line status equation.
Any point sag f on transmission line of electricity
xcan adopt as declivity parabolic formula calculates:
Wherein, l is the span of each shelves in transmission line of electricity; γ is that comprise and carry from anharmonic ratio, wind pressure ratio is carried with icing than carrying comprehensively than carrying in circuit unit level projected length; σ
0for with than carrying the perpendicular meridional stress component of active line, also claim horizontal stress, its value is identical everywhere at each point of electric wire, wherein σ
0calculating relevant with the temperature value drawn in step S103; H is the wire hitch point discrepancy in elevation; β is each shelves pole line hitch point height difference angle in transmission line of electricity, wherein β=arctan (h/l).
Described industrial control module 205, for carrying out Industry Control according to the sag of the described transmission line of electricity calculated.
As one of them embodiment, described industrial control module 205 can comprise judge module and alarm signal sending module;
Described judge module, for judging whether the sag of the described transmission line of electricity calculated exceedes default sag scope;
Described alarm signal sending module, during for having exceeded the sag scope preset at the sag of described transmission line of electricity, has sent the alarm signal of sag over range.
After calculating the sag of described transmission line of electricity, each control field of operation of power networks can be widely used in, as sag monitoring alarm, network load Forecast and control etc.Based on the system software platform that the present invention develops, the real-time sag monitoring to any shelves of any transmission line of electricity can be realized.By the contrast of Real-Time Monitoring sag data and design load or service data, realize the dynamic compatibilization instructing operation of power networks.Any span whole day that simultaneously also can realize any transmission line of electricity is monitored automatically, and exceeding the circuit of operating standard setting as occurred, automatically sending warning, rapid reaction goes out position, is reported to operations staff and processes in time.
Compared with general technology, the present invention carries out the device of Industry Control by sag monitoring, by affecting the parameters of temperature of electric transmission line field, establishes the models for temperature field of transmission line of electricity.Because the numerical value affecting the parameters of temperature of electric transmission line field obtains by existing operation of power networks control system, therefore do not need additionally erecting equipment on transmission line of electricity when computing electric power line temperature value.According to the temperature value calculated, can further computing electric power line sag and utilize sag to carry out Industry Control.When carrying out sag monitoring and Industry Control by the present invention, owing to saving the cost installing monitoring equipment on transmission line of electricity, all fronts monitor and forecast of transmission line of electricity can be realized.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (6)
1. carried out a method for Industry Control by sag monitoring, it is characterized in that, comprise the following steps:
According to the parameters affecting temperature of electric transmission line field, set up the models for temperature field of transmission line of electricity; Wherein, formula Q is adopted
r+ Q
t=Q
d+ Q
f+ Q
hdetermine models for temperature field;
Wherein,
Q
t＝E
tA
tD，Q
d＝α
t(θ
W-θ
0)F
l，
K
ffor the skin effect coefficient of pole line, relevant with the shape and size of the frequency of electric current, pole line; I
wfor the electric current that pole line passes through; R
acfor the AC resistance of pole line; θ
wfor pole line temperature; θ
0for surrounding air (environment) temperature; α
tfor Natural Heat Convection coefficient, wherein α
t=1.5 (θ
w-θ
0)
0.35; E
tfor solar radiation power density; A
tfor the absorptivity of pole line; D is the diameter of pole line; F
1for unit length wire area of dissipation, relevant with the factor such as conductor size, arrangement; λ is pole line specific heat capacity coefficient; δ is pole line sub-conductor thickness;
Obtain the described numerical value affecting the parameters of temperature of electric transmission line field;
According to the numerical value of described parameters obtained and the described models for temperature field of foundation, the temperature value of computing electric power line;
According to the described temperature value calculated, calculated the sag of described transmission line of electricity by transmission line status equation; Wherein, any point sag f on transmission line of electricity
xadopt as declivity parabolic formula calculates:
Wherein, l is the span of each shelves in transmission line of electricity; γ is that comprise and carry from anharmonic ratio, wind pressure ratio is carried with icing than carrying comprehensively than carrying in circuit unit level projected length; σ
0for with than carrying the perpendicular meridional stress component of active line, also claim horizontal stress, its value is identical everywhere at each point of electric wire, wherein σ
0calculating relevant with temperature value; H is the wire hitch point discrepancy in elevation; β is each shelves pole line hitch point height difference angle in transmission line of electricity, wherein β=arctan (h/l);
Sag according to the described transmission line of electricity calculated carries out Industry Control.
2. method of being carried out Industry Control by sag monitoring according to claim 1, it is characterized in that, the described parameters affecting temperature of electric transmission line field comprise in the electric current of transmission line of electricity, voltage, load, model, design sag, the specific heat capacity numerical value of transmission line of electricity material, environment temperature, intensity of solar radiation and wind speed that transmission line of electricity is corresponding one or more.
3. method of being carried out Industry Control by sag monitoring according to claim 1, be is characterized in that, the sag of the described described transmission line of electricity according to calculating carries out the step of Industry Control, comprises the following steps:
Judge whether the sag of the described transmission line of electricity calculated exceedes default sag scope;
If the sag of described transmission line of electricity has exceeded the sag scope preset, then send the alarm signal of sag over range.
4. carried out a device for Industry Control by sag monitoring, it is characterized in that, comprise model building module, parameter values acquisition module, temperature value computing module, sag monitoring modular and industrial control module;
Described model building module, for according to the parameters affecting temperature of electric transmission line field, sets up the models for temperature field of transmission line of electricity; Wherein, formula Q is adopted
r+ Q
t=Q
d+ Q
f+ Q
hdetermine models for temperature field;
Wherein,
Q
t＝E
tA
tD，Q
d＝α
t(θ
W-θ
0)F
l，
K
ffor the skin effect coefficient of pole line, relevant with the shape and size of the frequency of electric current, pole line; I
wfor the electric current that pole line passes through; R
acfor the AC resistance of pole line; θ
wfor pole line temperature; θ
0for surrounding air (environment) temperature; α
tfor Natural Heat Convection coefficient, wherein α
t=1.5 (θ
w-θ
0)
0.35; E
tfor solar radiation power density; A
tfor the absorptivity of pole line; D is the diameter of pole line; F
1for unit length wire area of dissipation, relevant with the factor such as conductor size, arrangement; λ is pole line specific heat capacity coefficient; δ is pole line sub-conductor thickness;
Described parameter values acquisition module, for obtaining the described numerical value affecting the parameters of temperature of electric transmission line field;
Described temperature value computing module, for according to obtain the numerical value of described parameters and the described models for temperature field of foundation, the temperature value of computing electric power line;
Described sag monitoring modular, for according to the described temperature value calculated, calculates the sag of described transmission line of electricity by transmission line status equation; Wherein, any point sag f on transmission line of electricity
xadopt as declivity parabolic formula calculates:
Wherein, l is the span of each shelves in transmission line of electricity; γ is that comprise and carry from anharmonic ratio, wind pressure ratio is carried with icing than carrying comprehensively than carrying in circuit unit level projected length; σ
0for with than carrying the perpendicular meridional stress component of active line, also claim horizontal stress, its value is identical everywhere at each point of electric wire, wherein σ
0calculating relevant with temperature value; H is the wire hitch point discrepancy in elevation; β is each shelves pole line hitch point height difference angle in transmission line of electricity, wherein β=arctan (h/l);
Described industrial control module, for carrying out Industry Control according to the sag of the described transmission line of electricity calculated.
5. the device being carried out Industry Control by sag monitoring according to claim 4, it is characterized in that, the described parameters affecting temperature of electric transmission line field comprise in the electric current of transmission line of electricity, voltage, load, model, design sag, the specific heat capacity numerical value of transmission line of electricity material, environment temperature, intensity of solar radiation and wind speed that transmission line of electricity is corresponding one or more.
6. the device being carried out Industry Control by sag monitoring according to claim 4, it is characterized in that, described industrial control module comprises judge module and alarm signal sending module;
Described judge module, for judging whether the sag of the described transmission line of electricity calculated exceedes default sag scope;
Described alarm signal sending module, during for having exceeded the sag scope preset at the sag of described transmission line of electricity, has sent the alarm signal of sag over range.
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| CN104215180A (en) * | 2014-08-20 | 2014-12-17 | 国家电网公司 | Wireless sensor network based power transmission line sag detection device |
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| CN104406558B (en) * | 2014-12-16 | 2017-05-03 | 云南电网有限责任公司普洱供电局 | Method for monitoring power transmission line sag |
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