CN108921396A - A kind of powerline ice-covering early warning method based on microclimate and icing historical data - Google Patents
A kind of powerline ice-covering early warning method based on microclimate and icing historical data Download PDFInfo
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- CN108921396A CN108921396A CN201810608498.8A CN201810608498A CN108921396A CN 108921396 A CN108921396 A CN 108921396A CN 201810608498 A CN201810608498 A CN 201810608498A CN 108921396 A CN108921396 A CN 108921396A
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- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
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- G08B19/02—Alarm responsive to formation or anticipated formation of ice
Abstract
The powerline ice-covering early warning method based on microclimate and icing historical data that the invention discloses a kind of, this method passes through the application to current on-line monitoring technique, in icing monitoring and the monitoring of environment microclimate, compare icing historical data, make it possible ice-coating pre-warning, perfect power grid anti-ice Emergency System construction, break through the problem of existing icing on-line monitoring technique application, give full play to all weather operations of on-line monitoring technique, the high advantage of real-time, ice condition acquisition modes based on the artificial sight ice of torsion, it is strong to establish sensing capability, the efficient anti-ice pre-alarming system of quick response, it escorts for winter electric power netting safe running.
Description
Technical field
The present invention relates to early warning technology fields, and in particular to a kind of transmission line of electricity based on microclimate and icing historical data
Ice-coating pre-warning method.
Background technique
In recent years, the large area flashover of powerline ice-covering initiation, fitting damage, line oscillation, bar, tower, broken string
The even accidents such as a wide range of power outages cause serious threat to the safe operation of power grid.China is that powerline ice-covering is serious
One of country, at the beginning of 2008 in a wide range of ice disaster of south China, national direct economic loss has been more than 100,000,000,000 yuan, thus
It is to guarantee the matter of utmost importance of China's electric power netting safe running development that ice damage preventing and controlling, which are effectively performed,.
Currently, the mode that artificial sight ice is usually taken in O&M unit is observed and early warning during power grid icing season, but
It is easy icing track section generally all in mountain area, with a varied topography, awful weather, traffic is severe, and unmanned plane is not suitable in day gas bar
It works under part harsh conditions, generally needs 2-4 hours or more to freezing point is taken things philosophically, remote districts can only at most guarantee to see ice one daily
It is secondary, and covering mostly occurs in night, O&M unit will expend a large amount of human and material resources, financial resources carry out line walking and see ice.Therefore artificial
Ice is seen in many-sided requirement that power grid ice-coating pre-warning is not satisfied such as timeliness, accuracy, economy, ice-coating pre-warning is caused to respond
Speed is not prompt enough, blind area there are the time and spatially.
Summary of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, provide a kind of based on microclimate and icing history number
According to powerline ice-covering early warning method, to improve ice-coating pre-warning response speed and accuracy.
To achieve the above object, the technical scheme is that：
A kind of powerline ice-covering early warning method based on microclimate and icing historical data, the method includes：
S1, the clear icing region of meteorological data and route are utilized；
S2, the live icing value of thrust for obtaining icing region wire establish equivalent ice covering thickness computation model, are led with calculating
Line equivalence ice covering thickness；
S3, conducting wire equivalence ice covering thickness and preset limit value are compared, if being more than preset limit value, start ice-melt
Scheme enters step S4 if being not above preset limit value；
S4, according to microclimate data and icing historical data, the current icing situation of combination wire, when judging one section following
In, whether the ice covering thickness of conducting wire can be more than preset limit value, no, then issue meteorological condition Risk-warning information, be, then into
Enter step S5；
S5, the icing situation on conducting wire is checked；
S6, equivalent ice covering thickness wind is issued according to conducting wire equivalence ice covering thickness, icing growth trend and early warning risk class
Dangerous warning information, and start ice-melt scheme.
The step S2 is specifically included：
S21, tower transmission line icing calculating statical model is established, to calculate wire icing parameter；
S22, static(al) credit in statical model progress vertical plane is calculated to tower transmission line icing according to wire icing parameter
Analysis；
S23, statical model progress windage yaw plane is calculated the tower transmission line icing after statics Analysis in vertical plane
Interior statics Analysis, to obtain parameter in conducting wire windage yaw plane；
S24, ice covering thickness computation model in windage yaw plane is established according to parameter in conducting wire windage yaw plane, is led with calculating
The equivalent ice covering thickness of line.
The step S21 is specially：
In the vertical plane that mobile jib tower and large, trumpet shaft tower and overhead transmission line are constituted, establish overhead transmission line calm and
Stress model when without external loads such as icing：Span between mobile jib tower A and trumpet side lever tower B and large size side lever tower C is respectively
l1And l2, conducting wire original length is respectively S1And S2, it is respectively h that conducting wire, which hangs point height difference,1And h2, height difference angle is respectively β1And β2,
The horizontal span of large, trumpet side lever tower conducting wire minimum point to mobile jib tower is respectively laAnd lb；
The method that geometry decomposition is used in calm and when without external loads such as icing stress models to overhead transmission line：Firstly,
Route basic statics parameter when calculating non-icing in vertical plane；Then, consider that insulator chain and route are influenced by windage yaw,
Deviate vertical plane angle η, forms route windage yaw plane；Finally, being established in windage yaw plane quiet on the plane vertical direction
Equilibrium equation, to calculate wire icing parameter.
The step S22 is specially：
According to original length S when traverse design, it is known that shaft tower span l, height difference angle β and conducting wire self weight are than carrying γ, by conducting wire
The oblique parabola approximate formula of length can derive the conducting wire horizontal stress σ in vertical plane, that is,
According to above formula, the horizontal stress σ of small large size shaft tower side transmission pressure can be calculated separately10And σ20, and they are divided
Not Dai Ru following formula, can acquire small, large size shaft tower side conducting wire minimum point to mobile jib tower horizontal span lbAnd la, that is,
By laAnd lbCalculated result bring into following formula respectively, small, large size shaft tower side conducting wire minimum point to mobile jib can be acquired
The conductor length S of towerbAnd Sa, i.e.,
The step S23 is specially：
The conducting wire of non-icing is influenced by lateral stability wind, and the geometrical plane of route and its insulator chain composition will be whole
With η angle offset vertical plane, windage yaw plane is formed；
With the S in step S22bAnd SaCalculation it is identical, small, the large size shaft tower side calculated in windage yaw plane is led
Wire length S' of the line minimum point to mobile jib towerbAnd S'a, that is,
In formula：γ',σ10’、σ20’、la’、lb', be respectively windage yaw plane under, conducting wire self weight than load, small, large size shaft tower side
The horizontal stress of transmission pressure, the horizontal span of small, large size shaft tower side conducting wire minimum point to mobile jib tower；
Vertical direction is comprehensive than carrying γ '=γ/cos η in windage yaw plane；Other parameters in windage yaw plane, span l', height
Declinate β ' and horizontal stress σ ', respectively：
The step S24 is specially：
Assuming that large, trumpet shaft tower side insulator chain is with the same direction and tilts angular oscillatory motion, so that after swinging in windage yaw plane
Span and conductor length remain unchanged, establish ice covering thickness computation model in windage yaw plane, F is by drawing for insulator chain axial tension
Force snesor measures, the direction of the power and the tiltangleθ in the angle of vertical direction in windage yaw plane, that is, windage yaw plane ' identical；
Tiltangleθ of the angle of wind deflection η and vertical plane interior insulation substring that θ ' is measured with angular transducer along conducting wire direction has
Following relationship：
If Gt is the sum of conducting wire, insulator chain and fitting self weight, insulator chain and fitting self weight are Gi, and conducting wire division number is
N then has：
Gt=Gi/2+w(Sa+Sb)n
In windage yaw plane vertical span, the downward power of vertical direction is conducting wire, insulator chain and fitting self weight before icing
The sum of the comprehensive load that is cooperatively formed with wind, increase the comprehensive load increment formed by icing after icing.Pulling force passes
The upward pulling force of the vertical direction of sensor measurement is Fv=Fcos θ '.On the forward and backward vertical direction of vertical span inside conductor icing
Standing balance has following formula establishment：
Qice is wire icing load intensity in formula, and for each shaft tower, Gt is constant, then can be derived by above formula：
If iced insulator is ρ, diameter of wire D, icing shape is set as uniform cylindrical body according to route design standard, then is led
The equivalent ice covering thickness of line is:
The meteorological condition Risk-warning information include it is normal, pay attention to, be serious, critical；The table when temperature is greater than 0 DEG C
Show normally, indicates that transmission line of electricity is not influenced by ice disaster, i.e., icing risk is not present in transmission line of electricity and electric power pylon；Work as temperature
Less than 0 DEG C and be greater than -20 DEG C, relative humidity less than 80% when be note that indicate transmission line of electricity by ice disaster minimal effect, i.e.,
There are slight icing risks for transmission line of electricity and electric power pylon；When temperature less than 0 DEG C and be greater than -20 DEG C, relative humidity be greater than 80%
And when being greater than 90% be it is serious, expression transmission line of electricity is by ice disaster moderate influence, i.e., during transmission line of electricity and electric power pylon have
Spend icing risk；When temperature less than 0 DEG C and be greater than -20 DEG C, relative humidity be greater than 90% when to be critical, indicate transmission line of electricity by ice
Snow disaster evil severe influences, i.e., there are serious icing risks for transmission line of electricity and electric power pylon, easily leads to electric power netting safe running accident hair
It is raw.
The equivalence ice covering thickness Risk-warning information is including including normally, paying attention to, serious, critical；When equivalent icing is thick
It indicates normal when degree is 0, indicates that transmission line of electricity is not influenced by ice disaster, i.e., icing wind is not present in transmission line of electricity and electric power pylon
Danger；When equivalent ice covering thickness is less than the 30% of preset limit value be note that indicate transmission line of electricity by ice disaster minimal effect,
I.e. there are slight icing risks for transmission line of electricity and electric power pylon；When equivalent ice covering thickness be more than or equal to preset limit value 30%,
It and is to pay attention to being seriously, to indicate transmission line of electricity by ice disaster moderate influence, i.e. power transmission line when being less than the 60% of preset limit value
Road and electric power pylon have moderate icing risk；When equivalent ice covering thickness 60% more than or equal to preset limit value to be critical,
Indicate that transmission line of electricity is influenced by ice disaster severe, i.e., transmission line of electricity and electric power pylon easily lead to electricity there are serious icing risk
Net safe operation accident occurs.
Compared with prior art, the present invention the beneficial effect is that：
This method is by the application to current on-line monitoring technique, and in icing monitoring and the monitoring of environment microclimate, comparison is covered
Ice historical data, makes it possible ice-coating pre-warning, and perfect power grid anti-ice Emergency System construction breaks through existing icing and supervises online
The problem of survey technology application gives full play to the high advantage of all weather operations of on-line monitoring technique, real-time, reverses and artificial sees ice
Based on ice condition acquisition modes, establish that sensing capability is strong, efficient anti-ice pre-alarming system of quick response, be winter power grid security
Operation escorts.
Detailed description of the invention
Fig. 1 is the powerline ice-covering early warning method provided in an embodiment of the present invention based on microclimate and icing historical data
Flow chart；
Fig. 2 is the flow chart of step S2；
Fig. 3 is overhead transmission line in stress model figures calm and when without external loads such as icing；
Fig. 4 is the stress model figure of the overhead transmission line in windage yaw plane (X'-Y plane).
Specific embodiment
The contents of the present invention are described in further details with reference to the accompanying drawings and detailed description.
In this application, associated thumbnail language and Key Term are defined as follows：
Microclimate on-line monitoring：Environment temperature, humidity, wind speed, wind direction, air pressure meteorologic parameter are monitored, and will be collected
Various meteorologic parameters and its changing condition are transmitted in system host in real time by monitoring device, and system host can be to acquisition
To data stored, counted and analyzed, and all data are shown to by modes such as various reports, statistical chart, curves
User.
Meteorological data fusion：Be related to meteorology has microclimate information, national weather station information, satellite radar information (to need
Buying), satellite cloud picture information (needing to purchase), accurate real-time weather forecast (needing to purchase) etc., various information source is different, and structure is not
Together, the multi-source heterogeneous power grid weather information such as weather data and forecast data is subjected to effective integration, establishes structuring one
The data model of change, Uniform Name storage.
Icing risk class divides：According to existing meteorological condition and ice covering thickness, icing risk class is determined, including just
Often, pay attention to, is serious, critical, according to microclimate data and icing historical data in 24 hours futures, determining 24 hours icing of future
Risk class carries out early warning.
Embodiment：
As shown in fig.1, the powerline ice-covering early warning side based on microclimate and icing historical data that this example provides
Method specifically includes：
S1, using the clear icing region of meteorological data and route, with to provide accurate warning information basis；
S2, the live icing value of thrust that icing region wire is obtained by on-line monitoring device for transmission line, establish etc.
It is worth ice covering thickness computation model, to calculate conducting wire equivalence ice covering thickness, specifically, as shown in Fig. 2, including
S21, tower transmission line icing calculating statical model is established, to calculate wire icing parameter
(in X-Y plane, overhead transmission line is established in the vertical plane that mobile jib tower and large, trumpet shaft tower and overhead transmission line are constituted
It is as shown in Figure 3 in calm and when without external loads such as icing stress models.In figure：Mobile jib tower A and trumpet side lever tower B and large size side
Span between shaft tower C is respectively l1And l2, conducting wire original length is respectively S1And S2, it is respectively h that conducting wire, which hangs point height difference,1With
h2, height difference angle is respectively β1And β2, the horizontal span of large, trumpet side lever tower conducting wire minimum point to mobile jib tower is respectively laAnd lb；
To simplify wire icing calculating process and improving the accuracy calculated, to overhead transmission line calm and without icing etc.
The method that stress model when external load uses geometry decomposition：Firstly, route is substantially quiet when calculating non-icing in vertical plane
Mechanics parameter；Then, consider that insulator chain and route are influenced by windage yaw, deviate vertical plane angle η, it is flat to form route windage yaw
Face；Finally, the equation of static equilibrium on the plane vertical direction is established in windage yaw plane, to calculate wire icing ginseng
Number.
S22, static(al) credit in statical model progress vertical plane is calculated to tower transmission line icing according to wire icing parameter
Analysis
As shown in figure 3, according to original length S when traverse design, it is known that shaft tower span l, height difference angle β and conducting wire self weight are than carrying
γ can derive the conducting wire horizontal stress σ in vertical plane by the oblique parabola approximate formula of conductor length, that is,
According to above formula, the horizontal stress σ of small large size shaft tower side transmission pressure can be calculated separately10And σ20, and they are divided
Not Dai Ru following formula, can acquire small, large size shaft tower side conducting wire minimum point to mobile jib tower horizontal span lbAnd la, that is,
By laAnd lbCalculated result bring into following formula respectively, small, large size shaft tower side conducting wire minimum point to mobile jib can be acquired
The conductor length S of towerbAnd Sa, i.e.,
S23, statical model progress windage yaw plane is calculated the tower transmission line icing after statics Analysis in vertical plane
Interior statics Analysis, to obtain parameter in conducting wire windage yaw plane
The conducting wire of non-icing is influenced by lateral stability wind, and the geometrical plane of route and its insulator chain composition will be whole
Vertical plane is deviated at an angle, is formed windage yaw plane (X'-Y plane), which is the wind that angular transducer measures
Inclined η.
Existing computation model only carries out icing Mechanics Calculation in vertical plane, does not account for the influence of windage yaw factor
Or consideration is improper, the direction for the power that practical tension sensor measures is not secured in vertical plane, but with insulator and is led
Line windage yaw variation, at this moment existing calculating results and actual conditions just have deviation.Carry out the mechanics point in windage yaw plane
Analysis can establish the balance of power in a new plane, simplify calculating process, and accuracy is higher.
With the S in step S22bAnd SaCalculation it is identical, small, the large size shaft tower side calculated in windage yaw plane is led
Wire length S' of the line minimum point to mobile jib towerbAnd S'a, that is,
In formula：γ',σ10’、σ20’、la’、lb', be respectively windage yaw plane under, conducting wire self weight than load, small, large size shaft tower side
The horizontal stress of transmission pressure, the horizontal span of small, large size shaft tower side conducting wire minimum point to mobile jib tower；
Vertical direction is comprehensive than carrying γ '=γ/cos η in windage yaw plane；Other parameters in windage yaw plane, span l', height
Declinate β ' and horizontal stress σ ', respectively：
S24, ice covering thickness computation model in windage yaw plane is established according to parameter in conducting wire windage yaw plane, is led with calculating
The equivalent ice covering thickness of line
In windage yaw plane, icing will generate different conducting wire Horizontal Tensions in mobile jib tower two sides, so that insulator
String inclination.To simplify the analysis, it is assumed that large, trumpet shaft tower side insulator chain is with the same direction and inclination angular oscillatory motion, so that after swinging
Span and conductor length in windage yaw plane remain unchanged, and establish ice covering thickness computation model in windage yaw plane, specifically such as Fig. 4 institute
Show.Insulator chain axial tension F is measured by tension sensor, vertical direction (direction X') in the direction of the power and windage yaw plane
Tiltangleθ in angle, that is, windage yaw plane ' identical.
Tiltangleθ of the angle of wind deflection η and vertical plane interior insulation substring that θ ' is measured with angular transducer along conducting wire direction has
Following relationship：
If Gt is the sum of conducting wire, insulator chain and fitting self weight, insulator chain and fitting self weight are Gi, and conducting wire division number is
N then has：
Gt=Gi/2+w(Sa+Sb)n
In windage yaw plane vertical span, the downward power of vertical direction is conducting wire, insulator chain and fitting self weight before icing
The sum of the comprehensive load that is cooperatively formed with wind, increase the comprehensive load increment formed by icing after icing.Pulling force passes
The upward pulling force of the vertical direction of sensor measurement is Fv=Fcos θ '.On the forward and backward vertical direction of vertical span inside conductor icing
Standing balance has following formula establishment：
Qice is wire icing load intensity in formula, and for each shaft tower, Gt is constant, then can be derived by above formula：
If iced insulator is that (icing type is glaze, ρ=0.9*10 to ρ3kg/(mmm2)), diameter of wire D, according to route
Design standard sets icing shape as uniform cylindrical body, then the equivalent ice covering thickness of conducting wire is:
S3, conducting wire equivalence ice covering thickness and preset limit value are compared, if being more than preset limit value, start ice-melt
Scheme enters step S4 if being not above preset limit value；
S4, according to microclimate data and icing historical data, the current icing situation of combination wire, when judging one section following
In, whether the ice covering thickness of conducting wire can be more than preset limit value, no, then issue meteorological condition Risk-warning information, be, then into
Enter step S5；
S5, the icing situation on conducting wire is checked；
S6, equivalent ice covering thickness wind is issued according to conducting wire equivalence ice covering thickness, icing growth trend and early warning risk class
Dangerous warning information, and start ice-melt scheme.
It follows that this method is supervised by the application to current on-line monitoring technique in icing monitoring and environment microclimate
It surveys, compares icing historical data, make it possible ice-coating pre-warning, perfect power grid anti-ice Emergency System construction is broken through existing
The problem of icing on-line monitoring technique application gives full play to the high advantage of all weather operations of on-line monitoring technique, real-time, turns round
Turn the artificial ice condition acquisition modes seen based on ice, establish that sensing capability is strong, efficient anti-ice pre-alarming system of quick response, is the winter
Season, electric power netting safe running escort.
Specifically, above-mentioned meteorological condition Risk-warning information include it is normal, pay attention to, be serious, critical；When temperature is greater than
It indicates normal at 0 DEG C, indicates that transmission line of electricity is not influenced by ice disaster, i.e., icing wind is not present in transmission line of electricity and electric power pylon
Danger；When temperature less than 0 DEG C and be greater than -20 DEG C, relative humidity less than 80% when be note that indicate transmission line of electricity it is light by ice disaster
Lithographic is rung, i.e., there are slight icing risks for transmission line of electricity and electric power pylon；When temperature less than 0 DEG C and is greater than -20 DEG C, relative humidity
Be greater than 80% and when being greater than 90% it is serious, expression transmission line of electricity is by ice disaster moderate influence, i.e. transmission line of electricity and iron of transmitting electricity
Tower has moderate icing risk；It is critical, expression transmission of electricity when temperature is less than 0 DEG C and is greater than 90% greater than -20 DEG C, relative humidity
Route is influenced by ice disaster severe, i.e., there are serious icing risks for transmission line of electricity and electric power pylon, easily leads to power grid security fortune
It acts therefore occurs.
| Temperature | 0 DEG C of > | - 20~0 DEG C | - 20~0 DEG C | - 20~0 DEG C |
| Relative humidity | —— | < 80% | 80%~90% | >=90% |
| Risk class | Normally | Pay attention to | Seriously | It is critical |
Above-mentioned equivalent ice covering thickness Risk-warning information is including including normally, paying attention to, serious, critical；When equivalent icing
With a thickness of indicating normal when 0, indicate that transmission line of electricity is not influenced by ice disaster, i.e., icing is not present in transmission line of electricity and electric power pylon
Risk；It is note that indicating transmission line of electricity by the slight shadow of ice disaster when equivalent ice covering thickness is less than the 30% of preset limit value
It rings, i.e., there are slight icing risks for transmission line of electricity and electric power pylon；When equivalent ice covering thickness is more than or equal to preset limit value
30% and while being less than the 60% of preset limit value be pay attention to be it is serious, indicate transmission line of electricity by ice disaster moderate influence, i.e., it is defeated
Electric line and electric power pylon have moderate icing risk；It is danger when equivalent ice covering thickness is more than or equal to the 60% of preset limit value
It is anxious, indicate that transmission line of electricity is influenced by ice disaster severe, i.e., transmission line of electricity and electric power pylon are easily led to there are serious icing risk
Electric power netting safe running accident occurs.
| Equivalent ice covering thickness | 0 | 0~design value 30% | 30%~design value of design value 60% | >=design value 60% |
| Risk class | Normally | Pay attention to | Seriously | It is critical |
Simply to illustrate that technical concepts and features of the invention, its purpose is allows in the art above-described embodiment
Those of ordinary skill cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all
It is the equivalent changes or modifications that the essence of content according to the present invention is made, should be covered by the scope of protection of the present invention.
Claims (8)
1. a kind of powerline ice-covering early warning method based on microclimate and icing historical data, which is characterized in that the method
Including：
S1, the clear icing region of meteorological data and route are utilized；
S2, the live icing value of thrust for obtaining icing region wire establish equivalent ice covering thickness computation model, to calculate conducting wire etc.
It is worth ice covering thickness；
S3, conducting wire equivalence ice covering thickness and preset limit value are compared, if being more than preset limit value, start ice-melt side
Case enters step S4 if being not above preset limit value；
S4, according to microclimate data and icing historical data, the current icing situation of combination wire judges following a period of time
Interior, whether the ice covering thickness of conducting wire can be more than preset limit value, no, then issues meteorological condition Risk-warning information, be then to enter
Step S5；
S5, the icing situation on conducting wire is checked；
S6, to issue equivalent ice covering thickness risk according to conducting wire equivalence ice covering thickness, icing growth trend and early warning risk class pre-
Alert information, and start ice-melt scheme.
2. the powerline ice-covering early warning method based on microclimate and icing historical data as described in claim 1, feature
It is, the step S2 is specifically included：
S21, tower transmission line icing calculating statical model is established, to calculate wire icing parameter；
S22, statics Analysis in statical model progress vertical plane is calculated to tower transmission line icing according to wire icing parameter；
S23, to after statics Analysis in vertical plane tower transmission line icing calculate statical model carry out windage yaw plane in it is quiet
Mechanical analysis, to obtain parameter in conducting wire windage yaw plane；
S24, ice covering thickness computation model in windage yaw plane is established according to parameter in conducting wire windage yaw plane, to calculate conducting wire etc.
Imitate ice covering thickness.
3. the powerline ice-covering early warning method based on microclimate and icing historical data as claimed in claim 2, feature
It is, the step S21 is specially：
In the vertical plane that mobile jib tower and large, trumpet shaft tower and overhead transmission line are constituted, establishes overhead transmission line and covered in calm and nothing
The stress model when external loads such as ice：Span between mobile jib tower A and trumpet side lever tower B and large size side lever tower C is respectively l1With
l2, conducting wire original length is respectively S1And S2, it is respectively h that conducting wire, which hangs point height difference,1And h2, height difference angle is respectively β1And β2, big,
The horizontal span of small size side lever tower conducting wire minimum point to mobile jib tower is respectively laAnd lb；
The method that geometry decomposition is used in calm and when without external loads such as icing stress models to overhead transmission line：Firstly, hanging down
Route basic statics parameter when calculating non-icing in straight plane；Then, consider that insulator chain and route are influenced by windage yaw, deviate
Vertical plane angle η forms route windage yaw plane；Finally, the static(al) established on the plane vertical direction in windage yaw plane is flat
Weigh equation, to calculate wire icing parameter.
4. the powerline ice-covering early warning method based on microclimate and icing historical data as claimed in claim 3, feature
It is, the step S22 is specially：
According to original length S when traverse design, it is known that shaft tower span l, height difference angle β and conducting wire self weight are than carrying γ, by conductor length
Oblique parabola approximate formula, derives the conducting wire horizontal stress σ in vertical plane, that is,
According to above formula, the horizontal stress σ of small large size shaft tower side transmission pressure is calculated separately10And σ20, and under they are substituted into respectively
Formula, acquire small, large size shaft tower side conducting wire minimum point to mobile jib tower horizontal span lbAnd la, that is,
By laAnd lbCalculated result bring into following formula respectively, acquire the conducting wire of small large size shaft tower side conducting wire minimum point to mobile jib tower
Length SbAnd Sa, i.e.,
5. the powerline ice-covering early warning method based on microclimate and icing historical data as claimed in claim 4, feature
It is, the step S23 is specially：
The conducting wire of non-icing is influenced by lateral stability wind, and the geometrical plane of route and its insulator chain composition will be integrally with η
Angle offset vertical plane forms windage yaw plane；
With the S in step S22bAnd SaCalculation it is identical, calculate small, large size shaft tower side conducting wire in windage yaw plane most
Wire length S' of the low spot to mobile jib towerbAnd S'a, that is,
In formula：γ',σ10’、σ20’、la’、lb', be respectively under windage yaw plane, conducting wire self weight is than carrying, small, large size shaft tower side is transmitted electricity
The horizontal stress of conducting wire, the horizontal span of small, large size shaft tower side conducting wire minimum point to mobile jib tower；
Vertical direction is comprehensive than carrying γ '=γ/cos η in windage yaw plane；Other parameters in windage yaw plane, span l', height difference angle
β ' and horizontal stress σ ', respectively：
6. the powerline ice-covering early warning method based on microclimate and icing historical data as claimed in claim 5, feature
It is, the step S24 is specially：
Assuming that large, trumpet shaft tower side insulator chain is with the same direction and tilts angular oscillatory motion, so that the shelves after swinging in windage yaw plane
Away from remaining unchanged with conductor length, ice covering thickness computation model in windage yaw plane is established, insulator chain axial tension F is passed by pulling force
Sensor measures, the direction of the power and the tiltangleθ in the angle of vertical direction in windage yaw plane, that is, windage yaw plane ' identical；
Tiltangleθ of the angle of wind deflection η and vertical plane interior insulation substring that θ ' and angular transducer measure along conducting wire direction has as follows
Relationship：
If Gt is the sum of conducting wire, insulator chain and fitting self weight, insulator chain and fitting self weight are Gi, and conducting wire division number is n, then
Have：
Gt=Gi/2+w(Sa+Sb)n
In windage yaw plane vertical span, the downward power of vertical direction is the sum of conducting wire, insulator chain and fitting self weight before icing
The comprehensive load cooperatively formed with wind increases the comprehensive load increment formed by icing after icing.Tension sensor
The upward pulling force of the vertical direction of measurement is Fv=Fcos θ '.Static(al) on the forward and backward vertical direction of vertical span inside conductor icing
Balance, there is following formula establishment：
Qice is wire icing load intensity in formula, and for each shaft tower, Gt is constant, then can be derived by above formula：
If iced insulator is ρ, diameter of wire D, icing shape is set according to route design standard as uniform cylindrical body, then conducting wire etc.
Imitating ice covering thickness is:
7. the powerline ice-covering early warning method based on microclimate and icing historical data as described in claim 1, feature
Be, the meteorological condition Risk-warning information include it is normal, pay attention to, be serious, critical；It is indicated when temperature is greater than 0 DEG C
Normally, indicate that transmission line of electricity is not influenced by ice disaster, i.e., icing risk is not present in transmission line of electricity and electric power pylon；When temperature is small
In 0 DEG C and be greater than -20 DEG C, relative humidity less than 80% when be note that indicate transmission line of electricity by ice disaster minimal effect, i.e., it is defeated
There are slight icing risks for electric line and electric power pylon；When temperature less than 0 DEG C and be greater than -20 DEG C, relative humidity be greater than 80% and
Be when greater than 90% it is serious, indicate transmission line of electricity by ice disaster moderate influence, i.e., transmission line of electricity and electric power pylon have moderate
Icing risk；When temperature less than 0 DEG C and be greater than -20 DEG C, relative humidity be greater than 90% when to be critical, indicate transmission line of electricity by ice and snow
Disaster severe influences, i.e., there are serious icing risks for transmission line of electricity and electric power pylon, easily leads to the generation of electric power netting safe running accident.
8. the powerline ice-covering early warning method based on microclimate and icing historical data as described in claim 1, feature
It is, the equivalence ice covering thickness Risk-warning information is including including normally, paying attention to, serious, critical；When equivalent ice covering thickness is
It indicates normal when 0, indicates that transmission line of electricity is not influenced by ice disaster, i.e., icing risk is not present in transmission line of electricity and electric power pylon；
It is note that expression transmission line of electricity is by ice disaster minimal effect, i.e., when equivalent ice covering thickness is less than the 30% of preset limit value
There are slight icing risks for transmission line of electricity and electric power pylon；When equivalent ice covering thickness be more than or equal to preset limit value 30% and
Less than preset limit value 60% when be pay attention to be it is serious, indicate transmission line of electricity by ice disaster moderate influence, i.e. transmission line of electricity
And electric power pylon has moderate icing risk；It is critical, table when equivalent ice covering thickness is more than or equal to the 60% of preset limit value
Show that transmission line of electricity is influenced by ice disaster severe, i.e., transmission line of electricity and electric power pylon easily lead to power grid there are serious icing risk
Safe operation accident occurs.
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| CN110866693A (en) * | 2019-11-14 | 2020-03-06 | 国网湖北省电力有限公司电力科学研究院 | Overhead transmission line icing risk assessment method based on GIS model |
| CN111967147A (en) * | 2020-07-30 | 2020-11-20 | 华南理工大学 | Method for calculating key parameters of ice coating growth model of overhead transmission line |
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