CN104573192A - Online monitoring method for equivalent icing thickness of strain tower of overhead line - Google Patents

Online monitoring method for equivalent icing thickness of strain tower of overhead line Download PDF

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Publication number
CN104573192A
CN104573192A CN201410789648.1A CN201410789648A CN104573192A CN 104573192 A CN104573192 A CN 104573192A CN 201410789648 A CN201410789648 A CN 201410789648A CN 104573192 A CN104573192 A CN 104573192A
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China
Prior art keywords
ground wire
line monitoring
equivalent
lead
thrust
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CN201410789648.1A
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CN104573192B (en
Inventor
阳林
郝艳捧
朱俊霖
李�昊
李锐海
陈晓国
傅闯
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South China University of Technology SCUT
CSG Electric Power Research Institute
Research Institute of Southern Power Grid Co Ltd
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South China University of Technology SCUT
Research Institute of Southern Power Grid Co Ltd
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Abstract

The invention discloses an online monitoring method for the equivalent icing thickness of a strain tower of an overhead line. The method comprises the following steps of (1) extracting historical online-monitored wire/ground wire tension data to acquire historical wire/ground wire tension in an iceless period; (2) acquiring historical wire/ground wire load data to obtain a maximum load according to the historical wire/ground wire tension in the iceless period; (3) obtaining a maximum equivalent wire/ground wire length according to the maximum load and basic pole and tower information provided by the State Grid; (4) extracting real-time online-monitored wire/ground wire tension data, and calculating a wire/ground wire equivalent icing thickness; (5) selecting the equivalent icing thickness to judge the icing amount of the overhead line according to real-time meteorological data. The method has the advantages of simplicity in calculation and high accuracy and reliability.

Description

The on-line monitoring method of the equivalent ice covering thickness of a kind of overhead transmission line anchor support
Technical field
The present invention relates to the transmission line of electricity on-line monitoring field of power domain, particularly the on-line monitoring method of the equivalent ice covering thickness of a kind of overhead transmission line anchor support.
Background technology
Along with social economy more and more develops, stable, the safe and reliable supply of electric power becomes the problem become more and more important.And though icing is a kind of common spontaneous phenomenon, the safe operation of electrical network in ice damage serious threat.In power equipment, ice damage can cause insulator rupture, and gold utensil damages, and shaft tower collapses, wire fracture, directly causes the power failure of wiring region; In social production, the inclement weather of ice damage can cause that traffic is obstructed, communication disruption, and electric power first-aid is very difficult, and large-area electrical network paralysis causes industrial and agricultural production to stop production, various service sector is stagnated, and directly cause heavy economic loss, people's lives cannot normally be carried out.In order to ensure the safe operation of electrical network, needing to monitor the icing situation of transmission line of electricity and judging whether to take corresponding measure to avoid the generation of accidents such as breaking, take.
Current power transmission line ice coating on-line monitoring almost all adopts weight method.So-called weight method is ball-eye pulling force sensor being substituted insulator, angle and pulling force sensor is utilized to measure the inclination angle of suspension insulator, angle of wind deflection and comprehensive load respectively, utilize microclimate sensor group (containing temperature, relative humidity, wind speed, wind direction, sensors such as rainfall) measuring wind etc., then substitute into equivalent ice covering thickness computation model and can calculate real-time wire equivalence ice cover.According to existing patent " on-line monitoring method of the equivalent ice covering thickness of a kind of overhead transmission line ", incorporation engineering application is actual at present, proposes the tangent tower icing equivalent thickness computation model being applied to south electric network overhead transmission line icing on-line monitoring system.But, tension tower conducting wire ice covering thickness calculating at present based on weight method is still studied less, be applied to the less of ice covering monitoring system, cause to calculate tension tower conducting wire ice covering thickness, grid company still accurately and effectively cannot grasp anchor support line ice coating situation, and then compares with design specifications and carry out early warning.The anchor support ice covering thickness of existing transmission line of electricity calculates deficiency and is mainly manifested in: 1, the parameter that relates to of theoretical calculation model and formula too much, and need to collect data based on a large amount of icing data, limit the engineer applied of this model to a certain extent; 2, some model considers wind load, but this value cannot accurately calculate, and during icing often air velocity transducer freeze, the data obtained is invalid; 3, the ice thickness difference of ice thickness and in-site measurement that calculates of some model theory model is large, and cause the model calculation inaccurate, and most models is not applied to the experience of actual icing on-line monitoring system, its calculating accuracy is still to be tested.
Summary of the invention
The shortcoming that the object of the invention is to overcome prior art, with not enough, provides a kind of on-line monitoring method calculating simple, accuracy and the high equivalent ice covering thickness of overhead transmission line anchor support of reliability.
Object of the present invention is achieved through the following technical solutions: the on-line monitoring method of the equivalent ice covering thickness of a kind of overhead transmission line anchor support, comprises the following steps:
(1) extract anchor support on-line monitoring to lead/ground wire history pulling force data and history weather data, reject the anchor support being in icing period lead/ground wire history pulling force according to history weather data, the anchor support obtained without ice period leads/ground wire history pulling force data;
(2) lead/ground wire history pulling force data according to the anchor support without ice period, led/ground wire history payload data; And to the anchor support obtained lead/ground wire history payload data carries out Frequence Analysis, obtains peak load;
(3) according to the pole and tower foundation parameter that the peak load obtained in step (2) and grid company provide, maximum equivalent is calculated to lead/ground line length;
(4) extract anchor support on-line monitoring and lead/real-time the pulling force data of ground wire, obtain anchor support to lead/ground wire real time load data, peak load, maximum equivalent are led/ground line length and leading/ground wire real time load data are updated in anchor support equivalence ice covering thickness model, calculate anchor support to lead the/equivalent ice covering thickness of ground wire;
(5) according to the real time meteorological data of on-line monitoring, the equivalent ice covering thickness of seletion calculation judges the ice cover of overhead transmission line.
Preferably ,/ground wire history load G is led in described step (2) 0for:
G 0=F;
Wherein F is for leading/ground wire history value of thrust.
Further, when insulator serial type is I string, then anchor support on-line monitoring lead/ground wire history value of thrust is and leads/ground wire history value of thrust F;
When insulator serial type is two I string, and wherein a string pulling force sensor is installed, then anchor support on-line monitoring lead/ground wire history value of thrust is multiplied by 2 for leading/ground wire history value of thrust F;
When insulator serial type is two I string, and often go here and there and all pulling force sensor be installed, then anchor support on-line monitoring lead/ground wire history value of thrust is and leads/ground wire history value of thrust F.
Preferably, in described step (3), maximum equivalent leads/ground line length l mfor:
l m=G m/(q 0n);
Wherein G mfor the peak load obtained in step (2); q 0for leading/ground wire unit length deadweight, n is for leading/ground wire division number.
Preferably, lead in described step (4)/ground wire real time load data G is:
G=F';
Wherein F ' is for leading/real-time the pulling force of ground wire.
Further, the equivalent ice covering thickness h of anchor support in described step (4) mbe calculated as follows:
1. as G≤G mtime, h m=0;
2. as G>=G mtime, actual wire length S is:
S = 400 + q 0 2 × 400 3 24 × ( l m × q 0 ) 2 ;
Unit length wire icing load w is:
w = G n × 24 × ( S - 400 ) 400 × 20 ;
Add following correction factor w 1for:
w 1 = w 2 × ( l m × q 0 × n F ′ + w q 0 ) ;
Equivalent ice covering thickness h mfor:
h m = ( w 1 - q 0 ) ρ × π + D 2 4 - D 2
Wherein G mfor the peak load obtained in step (2); D leads the/diameter of ground wire, l mfor the maximum equivalent obtained in step (3) leads/ground line length, ρ is standard iced insulator, and n is for leading/ground wire division number.
Further, when insulator serial type is I string, then on-line monitoring lead/the real-time value of thrust of ground wire is and leads/real-time value of thrust the F ' of ground wire;
When insulator serial type is two I string, and wherein a string pulling force sensor is installed, then on-line monitoring lead/the real-time value of thrust of ground wire is multiplied by 2 for leading/real-time value of thrust the F ' of ground wire;
When insulator serial type is two I string, and often go here and there and all pulling force sensor be installed, then on-line monitoring lead/the real-time value of thrust of ground wire is and leads/real-time value of thrust the F ' of ground wire.
Preferably, weather data comprises temperature and relative humidity data in described step (1), in described step (1), environment temperature is less than 1 degree Celsius and is judged as icing period the period that relative humidity is greater than 80%.
Preferably, the method that peak load obtains in described step (2) is: to obtain lead/frequency of ground wire history payload data carries out normal distribution simulation, normal distribution is simulated the maximal value that gets as peak load, the maximal value in wherein said normal distribution simulation be probability 95% to 99.9% one of them value.
Preferably, described step (3) pole and tower foundation information comprises and leads/ground wire unit length deadweight, leads/ground wire division number, leads/ground linear diameter and insulator serial type.
The present invention has following advantage and effect relative to prior art:
(1) the inventive method is by analyzing anchor support Historical Monitoring data, utilize and go out peak load without the leading of ice period/ground wire history payload data Frequence Analysis, then show that maximum equivalent leads/ground line length according to peak load, finally by peak load, maximum equivalent leads/and ground line length and leading/ground wire real time load etc. is updated in equivalent ice covering thickness model and calculates equivalent ice covering thickness, according to the ice cover that current weather data select equivalent ice covering thickness to estimate in overhead transmission line, the present invention is from mechanics principle, consider and lead/the delta data of ground wire history length, there is accuracy and the high advantage of reliability, therefore, it is possible to provide effective foundation for the disposal decision-making of monitoring system, and there is the advantage that calculating is simple and generalization is strong.
(2) the inventive method is in equivalent ice covering thickness computation process, required shaft tower quantity of information is few, grid company only needs to provide wire/ground wire unit length deadweight, insulator serial type, leads/ground wire division number and lead/this several pole and tower foundation information of ground linear diameter, because these information are easily searched with drawing from handbook, avoid the information such as span, design conductor length using grass-roots unit to be difficult to accurately to find, required shaft tower information easy-to-search and easily providing.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the on-line monitoring method of the equivalent ice covering thickness of overhead transmission line anchor support in embodiment.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
Present embodiment discloses the on-line monitoring method of the equivalent ice covering thickness of a kind of overhead transmission line anchor support, as shown in Figure 1, the method concrete steps are as follows:
(1) extract and need monitoring electrical network on-line monitoring in 2011 to lead/ground wire history pulling force data and historical temperature and relative humidity data weather data, environment temperature be less than 1 degree Celsius and be judged as icing period the period that relative humidity is greater than 80%, and reject be in icing period lead/ground wire history pulling force data, obtain and lead/ground wire history pulling force data without ice period;
(2) according to leading/ground wire history pulling force without ice period, obtaining and leading/ground wire history payload data; And to obtain lead/ground wire history payload data carries out Frequence Analysis, to obtain peak load G m;
/ ground wire history load G is led in the present embodiment 0for:
G 0=F;
Wherein F is for leading/ground wire history value of thrust.At the present embodiment because insulator serial type is two I string, and often go here and there and all pulling force sensor is installed, therefore lead/on-line monitoring that ground wire history value of thrust F equals to obtain in step (1) leads/ground wire history value of thrust.
Peak load is obtained in the following manner: by history payload data G obtained above in the present embodiment 0carry out Frequence Analysis, and carry out normal distribution simulation according to frequency, obtain maximal value respectively as peak load G by this normal distribution simulation m;
(3) according to the pole and tower foundation information that the peak load obtained in step (2) and grid company provide, maximum equivalent is calculated to lead/ground line length l m;
Wherein the present embodiment maximum equivalent leads/ground line length l mfor:
l m=G m/(q 0n);
Wherein q 0for leading/ground wire unit length deadweight, n is for leading/ground wire division number;
(4) on-line monitoring extracting this electrical network on Dec 11st, 2012 to Dec 21 leads the/real-time pulling force data of ground wire, calculates lead/ground wire real time load data G, by peak load G according to these data m, maximum equivalent leads/ground line length l mand lead/ground wire real time comprehensive payload data G is updated in equivalent ice covering thickness model, calculates to lead/equivalent ice covering thickness the h of ground wire m;
Wherein lead in the present embodiment/ground wire real time load data G is:
G=F';
Wherein F ' is for leading/real-time the value of thrust of ground wire.At the present embodiment because insulator serial type is two I string, and often go here and there and all pulling force sensor is installed, therefore lead/ground wire real-time value of thrust F equals on-line monitoring leads the/real-time value of thrust of ground wire.
Conservative equivalent ice covering thickness h in the present embodiment mbe calculated as follows:
1. as G≤G mtime, h m=0;
2. as G>=G mtime, actual wire length S is:
S = 400 + q 0 2 × 400 3 24 × ( l m × q 0 ) 2 ;
Unit length wire icing load w is:
w = G n × 24 × ( S - 400 ) 400 × 20 ;
Add following correction factor w 1for:
w 1 = w 2 × ( l m × q 0 × n F ′ + w q 0 ) ;
Equivalent ice covering thickness h mfor:
h m = ( w 1 - q 0 ) ρ × π + D 2 4 - D 2
Wherein G mfor the peak load obtained in step (2); D leads the/diameter of ground wire, l mfor the maximum equivalent obtained in step (3) leads/ground line length, n is for leading/ground wire division number, and ρ is standard iced insulator, ρ=900kg/m in the present embodiment 3.
(5) according to the real time meteorological data of on-line monitoring, equivalent ice covering thickness h is selected mjudge the ice cover of overhead transmission line, thus determine whether will take corresponding deicing measure.
The step (2) of the present embodiment also can roughly estimate maximal value as peak load G by artificial observed frequency figure m.
In the present embodiment, when the insulator serial type adopted is other serial types, such as:
When insulator serial type is I string, then on-line monitoring lead/ground wire history value of thrust is and leads/ground wire history value of thrust F; On-line monitoring leads/and the real-time value of thrust of ground wire is and leads/real-time value of thrust the F ' of ground wire;
When insulator serial type is two I string, and wherein a string pulling force sensor is installed, then on-line monitoring lead/ground wire history value of thrust is multiplied by 2 for leading/ground wire history value of thrust F, on-line monitoring leads/the real-time value of thrust of ground wire is multiplied by 2 for leading/real-time value of thrust the F ' of ground wire.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.

Claims (10)

1. an on-line monitoring method for the equivalent ice covering thickness of overhead transmission line anchor support, is characterized in that, comprise the following steps:
(1) extract on-line monitoring to lead/ground wire history pulling force data and history weather data, according to history weather data reject be in icing period lead/ground wire history pulling force, obtain and lead/ground wire history pulling force data without ice period;
(2) according to leading/ground wire history pulling force data without ice period, obtaining and leading/ground wire history payload data; And to obtain lead/ground wire history payload data carries out Frequence Analysis, obtains peak load;
(3) according to the pole and tower foundation information that the peak load obtained in step (2) and grid company provide, maximum equivalent is calculated to lead/ground line length;
(4) extract on-line monitoring and lead/real-time the pulling force data of ground wire, calculate according to these data and lead/ground wire real time load data, peak load, maximum equivalent are led/ground line length and leading/ground wire real time load data are updated in equivalent ice covering thickness model, and calculate and lead/equivalent the ice covering thickness of ground wire;
(5) according to the real time meteorological data of on-line monitoring, select equivalent ice covering thickness to judge the ice cover of overhead transmission line.
2. the on-line monitoring method of the equivalent ice covering thickness of overhead transmission line anchor support according to claim 1, it is characterized in that, step leads/ground wire history load G described in (2) 0for:
G 0=F;
Wherein F is for leading/ground wire history value of thrust.
3. the on-line monitoring method of the equivalent ice covering thickness of overhead transmission line anchor support according to claim 2, is characterized in that, when insulator serial type is I string, then on-line monitoring lead/ground wire history value of thrust is and leads/ground wire history value of thrust F;
When insulator serial type is two I string, and wherein a string pulling force sensor is installed, then on-line monitoring lead/ground wire history value of thrust is multiplied by 2 for leading/ground wire history value of thrust F;
When insulator serial type is two I string, and often go here and there and all pulling force sensor be installed, then on-line monitoring lead/ground wire history value of thrust is and leads/ground wire history value of thrust F.
4. the on-line monitoring method of the equivalent ice covering thickness of overhead transmission line anchor support according to claim 1, is characterized in that, peak load l in step (3) mfor:
l m=G m/(q 0n);
Wherein G mfor the maximum average load obtained in step (2); q 0for leading/ground wire unit length deadweight, n is for leading/ground wire division number.
5. the on-line monitoring method of the equivalent ice covering thickness of overhead transmission line anchor support according to claim 1, is characterized in that, and step leads in (4)/and ground wire real time load data G is:
G=F';
Wherein F ' is for leading/real-time the pulling force of ground wire.
6. the on-line monitoring method of the equivalent ice covering thickness of overhead transmission line anchor support according to claim 5, is characterized in that, step leads the/equivalent ice covering thickness h of ground wire in (4) mbe calculated as follows:
1. as G≤G mtime, h m=0;
2. as G>=G mtime, actual wire length S is:
Unit length wire icing load w is:
Add following correction factor w 1for:
Equivalent ice covering thickness h mfor:
Wherein G mfor the peak load obtained in step (2); D leads the/diameter of ground wire, l mfor the maximum equivalent obtained in step (3) leads/ground line length, n is for leading/ground wire division number, and ρ is standard iced insulator.
7. the on-line monitoring method of the equivalent ice covering thickness of overhead transmission line anchor support according to claim 5, is characterized in that, and when insulator serial type is I string, on-line monitoring leads/and the real-time value of thrust of ground wire is and leads/real-time value of thrust the F ' of ground wire;
When insulator serial type is two I string, and wherein a string pulling force sensor is installed, then on-line monitoring lead/the real-time value of thrust of ground wire is multiplied by 2 for leading/real-time value of thrust the F ' of ground wire;
When insulator serial type is two I string, and often go here and there and all pulling force sensor be installed, then on-line monitoring lead/the real-time value of thrust of ground wire is and leads/real-time value of thrust the F ' of ground wire.
8. the on-line monitoring method of the equivalent ice covering thickness of overhead transmission line anchor support according to any one of claim 1 to 7, it is characterized in that, weather data comprises temperature and relative humidity data in step (1), in step (1), environment temperature is less than 1 degree Celsius and is judged as icing period the period that relative humidity is greater than 80%.
9. the on-line monitoring method of the equivalent ice covering thickness of the overhead transmission line anchor support according to any one of claim 1 to 7, it is characterized in that, the method that peak load obtains in step (2) is: to obtain lead/frequency of ground wire history payload data carries out normal distribution simulation, normal distribution is simulated the maximal value that gets as peak load, the maximal value in wherein said normal distribution simulation be probability 95% to 99.9% one of them value.
10. the on-line monitoring method of the equivalent ice covering thickness of the overhead transmission line anchor support according to any one of claim 1 to 7, it is characterized in that, described step (3) pole and tower foundation information comprises to be led/ground wire unit length deadweight, leads/ground wire division number, leads/ground linear diameter and insulator serial type.
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