CN101620000B - Calculating method of ice concentration of transmission line - Google Patents
Calculating method of ice concentration of transmission line Download PDFInfo
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- CN101620000B CN101620000B CN2009100894446A CN200910089444A CN101620000B CN 101620000 B CN101620000 B CN 101620000B CN 2009100894446 A CN2009100894446 A CN 2009100894446A CN 200910089444 A CN200910089444 A CN 200910089444A CN 101620000 B CN101620000 B CN 101620000B
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Abstract
The invention provides a computing method of ice concentration of a transmission line. The method comprises the following steps: the wire temperature and the elastic dependent variable in the fixed span of the transmission line are measured through a fiber grating measuring system; the total dependent variable in the fixed span of the transmission line is obtained according to the wire temperature and the elastic dependent variable; the wire specific load in the fixed span of the transmission line is obtained according to the total dependent variable and the wire specific load is compared with the wire self specific load in the fixed span of the transmission line; if the wire specific load is higher than the wire self specific load, the additional load in the fixed span of the transmission line is calculated; and the ice concentration in the fixed span of the transmission line is obtained according to the additional load. The invention overcomes the problem of higher measuring result error caused by lower measuring accuracy and poorer anti-electromagnetic interference capability due to the adoption of an electric parameter measuring method for measuring stress, temperature and inclination angle in the prior art.
Description
Technical field
The present invention relates to power domain, in particular to a kind of computing method of ice concentration of transmission line.
Background technology
Under the overall background of the economic fast development of current China, the whole society is more and more higher to the requirement of electric reliability, and the economic loss that electric power accident causes is more and more serious.Transmission line of electricity is widely distributed, and environment of living in is abominable, often runs into incidents such as large tracts of land pollution flashover, icing, thunderbolt, normally the weak link in the electrical network.
The monitoring method of high pressure overhead power line upper conductor mainly contains stress monitoring, temperature detection and sag monitoring method.Stress monitoring and sag monitoring also are the important technology bases of taking precautions against the icing, wire breaking accident.Data that monitoring system is obtained and information can offer dispatching of power netwoks department on the one hand, are used to realize circuit increase-volume and rational management; Can offer line maintenance maintenance department on the other hand, be used in time handling sag and icing problem, avoid accident to take place.
Prior art generally adopts the mounting structure of strain gauge pressure sensor, by the mechanical model that wire icing thickness and lead sag change, realizes the on-line monitoring of powerline ice-covering state.In this monitoring system, weight method is adopted in the measurement of ice cover.Weight method is to obtain span by foil gauge, because heavy burden increases, causes producing dependent variable, thereby tries to achieve ice cover in span.
In realizing process of the present invention, the inventor finds that the measurement of electric parameter method is adopted in the measurement owing to counter stress, temperature and inclination angle in the prior art, and its measuring accuracy is lower, and anti-electromagnetic interference capability is relatively poor, causes measuring result error bigger.
Summary of the invention
The present invention aims to provide a kind of computing method of ice concentration of transmission line, can solve in the prior art because the measurement of electric parameter method is adopted in the measurement at counter stress, temperature and inclination angle, its measuring accuracy is lower, and anti-electromagnetic interference capability is relatively poor, causes the bigger problem of measuring result error.
In an embodiment of the present invention, provide a kind of computing method of ice concentration of transmission line, may further comprise the steps: measured fixedly conductor temperature and the elastic strain amount in the span of transmission line of electricity by fiber grating measuring system; Obtain the fixedly overall strain amount in the span of transmission line of electricity according to conductor temperature and elastic strain amount; According to the overall strain amount obtain transmission line of electricity fixedly the lead in the span than carrying, and with lead than carry with transmission line of electricity fixedly the lead self in the span than year comparing; If lead is than carrying greater than lead self than carrying, computing electric power line is the interior additional load of span fixedly; Obtain the fixedly ice cover in the span of transmission line of electricity according to additional load.
In the above-described embodiments, measure the conductor temperature and the elastic module of transmission line of electricity by fiber grating measuring system, make and to adopt data that transmission line wire is directly measured that the ice cover of transmission line of electricity is calculated, result of calculation can directly reflect the running status of transmission line of electricity, simultaneously, measuring system adopts the fiber grating survey sensor, measurement result sensitivity is better, degree of accuracy is higher, thereby the result of calculation of the ice cover that obtains is more accurate, overcome in the prior art because counter stress, the measurement of electric parameter method is adopted in the measurement at temperature and inclination angle, its measuring accuracy is lower, and anti-electromagnetic interference capability is relatively poor, causes the bigger problem of measuring result error.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 shows the computing method process flow diagram of ice concentration of transmission line according to an embodiment of the invention;
Fig. 2 shows transmission line of electricity strain measurement synoptic diagram according to an embodiment of the invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Fig. 1 shows the computing method process flow diagram of ice concentration of transmission line according to an embodiment of the invention, may further comprise the steps:
S102 measures fixedly conductor temperature and the elastic strain amount in the span of transmission line of electricity by fiber grating measuring system;
S104 obtains the fixedly overall strain amount in the span of transmission line of electricity according to conductor temperature and elastic strain amount;
S106, according to the overall strain amount obtain transmission line of electricity fixedly the lead in the span than carrying, and with lead than carry with transmission line of electricity fixedly the lead self in the span than year comparing;
S108, if lead is than carrying greater than lead self than carrying, computing electric power line is the interior additional load of span fixedly;
S110 obtains the fixedly ice cover in the span of transmission line of electricity according to additional load.
In the present embodiment, measure the conductor temperature and the elastic module of transmission line of electricity by fiber grating measuring system, make and to adopt data that transmission line wire is directly measured that the ice cover of transmission line of electricity is calculated, result of calculation can directly reflect the running status of transmission line of electricity, simultaneously, measuring system adopts the fiber grating survey sensor, measurement result sensitivity is better, degree of accuracy is higher, thereby the result of calculation of the ice cover that obtains is more accurate, overcome in the prior art because counter stress, the measurement of electric parameter method is adopted in the measurement at temperature and inclination angle, its measuring accuracy is lower, and anti-electromagnetic interference capability is relatively poor, causes the big problem of measuring result error.
Measuring technique based on the powerline ice-covering state of grating sensing principle has been introduced the Fiber Bragg Grating technology of fast development in recent years, the novel conductive wire strain of using optical fibre grating technological development, temperature and measurement of dip angle sensing system.Fiber grating is a photosensitivity of utilizing fiber optic materials, makes inside of optical fibre produce vertical permanent periodicity or the aperiodicity variations in refractive index is made.Because fiber grating forms at inside of optical fibre, have full fiberize, insert lower, the lower-cost advantage of loss, and can be met the various spectral characteristics of specific needs by design optical grating construction; At sensory field of optic fibre, fiber grating can be as measuring such as physical quantity and some chemical sensory packages of measuring such as temperature, strain, vibration, pressure, sound field, electromagnetic fields.As the sensing components and parts, the ordinary optic fibre sensor bulk is less, sensitivity is higher except having for fiber grating, bandwidth is big, anti-electromagnetic interference capability is stronger, high temperature resistant and advantage such as corrosion, and easy of integration, intrinsic is good from the coherence, can realize the distributed sensor array.In addition, discriminating measurement when fiber-optic grating sensor can also be realized many physical parameters (as temperature, stress, pressure, flow etc.) has overcome traditional sensors cost height, the shortcoming that measuring accuracy is low.
Preferably, in the aforementioned calculation method, further comprising the steps of: if lead equals lead self than carrying than carrying, the transmission line of electricity running status is normal.
Preferably, in the aforementioned calculation method, transmission line of electricity is a steel-cored aluminium strand.
Steel-cored aluminium strand is as a kind of non-perfectly elastic body, and under the stretching action of Horizontal Tension, existing elastic strain also has plastic elongation; Lead produces when being heated and is subjected to thermal strain; Also there are the metal creep effect in steel and aluminium as metal, produce creep strain.In above-mentioned strain, remove and to be subjected to thermal strain to be because the effect of temperature produces, the generation of other strain all is results of the stress of conductor and time effect.Therefore under known lead temperature and the situation of stress time, the overall strain amount of the lead that measures according to fiber grating sensing system.
Preferably, in the aforementioned calculation method, according to conductor temperature and elastic strain amount obtain transmission line of electricity fixedly the overall strain measuring in the span comprise:
Calculate the fixedly dependent variable X of the steel core in the span of steel-cored aluminium strand respectively
SDependent variable X with aluminum steel
A,
X
S＝DT
S+ELA
S+ST
S+CRP
S
X
A＝DT
A+ELA
A+ST
A+CRP
A，
Wherein, DT
S, DT
ABe the thermal strain that is subjected to of steel core and aluminum steel, ELA
S, ELA
ABe the elastic strain of steel core and aluminum steel, ST
S, ST
ABe the sedimentation strain of steel core and aluminum steel, CRP
S, CRP
ACreep strain for steel core and aluminum steel;
Make the dependent variable X of steel core
SDependent variable X with aluminum steel
AEquate as the fixing overall strain amount in the span of transmission line of electricity.
Fig. 2 shows transmission line of electricity strain measurement synoptic diagram according to an embodiment of the invention.
Preferably, in the aforementioned calculation method, according to the overall strain amount obtain transmission line of electricity fixedly the lead in the span comprise than carrier body:
Mean tension P when calculating the steel-cored aluminium strand operation,
P＝A
Sσ
S+A
Aσ
A；
According to transmission line wire length calculation formula in the fixing span, conductor length change with the lead dependent variable between relation and the mean tension during the lead operation with along the relation between the Horizontal Tension of lead each point, press the batch total that establishes an equation and calculate the fixedly interior lead ratio of span year of steel-cored aluminium strand:
Mean tension when wherein, P is the steel-cored aluminium strand operation; A
S, A
ABe respectively steel core and aluminum steel calculating sectional area partly in the steel-cored aluminium strand; σ
S, σ
ABe respectively the stress of steel core and aluminum steel; L is the length of steel-cored aluminium strand; H is the Horizontal Tension along the steel-cored aluminium strand each point; B is fixedly half of span of steel-cored aluminium strand; W is that the lead ratio of steel-cored aluminium strand carries; E is the fixedly elongation in the span of one of steel-cored aluminium strand; X is the overall strain amount of the described steel-cored aluminium strand that calculates.
In the present embodiment, the fixedly span of transmission line of electricity, lead parameter (comprise the steel-cored aluminium strand calculated diameter, steel core partly calculates the cross section, and aluminum steel partly calculates the cross section, and the ratio of lead unit length carries) are by searching acquisition.
In the above-described embodiments, during calculating, will
Do as a whole finding the solution:
As order
By formula
Can get
By system of equations
Can get
Because E=X under the situation of known lead overall strain X, by finding the solution following formula, can try to achieve M, promptly
With the M substitution
Can try to achieve H, and then obtain lead than carrying W.
Preferably, in the aforementioned calculation method, according to additional load obtain transmission line of electricity fixedly the ice cover in the span specifically comprise: according to the wind speed and the angle of wind deflection of steel-cored aluminium strand present position, calculate the fixedly interior wind load of span of steel-cored aluminium strand; With steel-cored aluminium strand fixedly the additional load in the span deduct wind load, obtain the fixedly ice coating load in the span of steel-cored aluminium strand; Obtain fixedly icing weight and the ice covering thickness in the span of steel-cored aluminium strand according to ice coating load.In the present embodiment, the wind speed of steel-cored aluminium strand present position and angle of wind deflection can be measured by the small-sized weather station that is installed on the shaft tower.
The strain that utilization measures, calculate lead than carrying, the lead that calculates is compared than carrying to carry with the ratio of transmission line wire self, if calculated value equals lead self than carrying, then illustrate this fixedly in the span running status of transmission line of electricity do not change, promptly the transmission line of electricity running status is normal; If calculated value than carrying, illustrates then at this and fixedly move lead generation additional load in the span that the source of additional load mainly contains two greater than lead self, one is the effect of icing, and one is the influence of wind.The wind effect, can be tried to achieve by the correlation computations formula under the situation of known correlation parameter the load (being wind load) that lead produces.In additional load, deduct the effect of wind load, just can obtain the effect of icing load, and then can try to achieve the fixedly size of the ice cover (weight and ice covering thickness) of the interior transmission line wire of span.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the memory storage and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the computing method of an ice concentration of transmission line is characterized in that, may further comprise the steps:
Measure fixedly conductor temperature and the elastic strain amount in the span of described transmission line of electricity by fiber grating measuring system;
Obtain the fixedly overall strain amount in the span of described transmission line of electricity according to described conductor temperature and described elastic strain amount;
According to described overall strain amount obtain described transmission line of electricity fixedly the lead in the span than carrying, and with described lead than carry with described transmission line of electricity fixedly the lead self in the span than year comparing;
If described lead calculates the fixedly interior additional load of span of described transmission line of electricity than carrying greater than described lead self than carrying;
Obtain the fixedly ice cover in the span of described transmission line of electricity according to described additional load.
2. computing method according to claim 1 is characterized in that, and are further comprising the steps of:
If described lead equals described lead self than carrying than carrying, described transmission line of electricity running status is normal.
3. computing method according to claim 1 is characterized in that, described transmission line of electricity is a steel-cored aluminium strand.
4. computing method according to claim 3 is characterized in that, according to described conductor temperature and described elastic strain amount obtain described transmission line of electricity fixedly the overall strain measuring in the span comprise:
Calculate the fixedly dependent variable X of the steel core in the span of described steel-cored aluminium strand respectively
SDependent variable X with aluminum steel
A,
X
S＝DT
S+ELA
S+ST
S+CRP
S
，
X
A＝DT
A+ELA
A+ST
A+CRP
A
Wherein, DT
S, DT
ABe the thermal strain that is subjected to of described steel core and described aluminum steel, ELA
S, ELA
ABe the elastic strain of described steel core and described aluminum steel, ST
S, ST
ABe the sedimentation strain of described steel core and described aluminum steel, CRP
S, CRP
ACreep strain for described steel core and described aluminum steel;
Make the dependent variable X of described steel core
SDependent variable X with described aluminum steel
AEquate as the fixing overall strain amount in the span of described transmission line of electricity.
5. computing method according to claim 4 is characterized in that, according to described overall strain amount obtain described transmission line of electricity fixedly the lead in the span comprise than carrier body:
Mean tension P when calculating the operation of described steel-cored aluminium strand,
P＝A
Sσ
S+A
Aσ
A；
According to transmission line wire length calculation formula in the fixing span, conductor length change with the lead dependent variable between relation and the mean tension during the lead operation with along the relation between the Horizontal Tension of lead each point, press the batch total that establishes an equation and calculate the fixedly interior lead ratio of span year of described steel-cored aluminium strand:
Mean tension when wherein, P is the operation of described steel-cored aluminium strand; A
S, A
ABe respectively steel core and aluminum steel calculating sectional area partly in the described steel-cored aluminium strand; σ
S, σ
ABe respectively the stress of described steel core and described aluminum steel; L is the length of described steel-cored aluminium strand; H is the Horizontal Tension along described steel-cored aluminium strand each point; B is fixedly half of span of described steel-cored aluminium strand; W is that the lead ratio of described steel-cored aluminium strand carries; E is the fixedly elongation in the span of one of described steel-cored aluminium strand; X is the overall strain amount of the described steel-cored aluminium strand that calculates.
6. computing method according to claim 5 is characterized in that, according to described additional load obtain described transmission line of electricity fixedly the ice cover in the span specifically comprise:
According to the wind speed and the angle of wind deflection of described steel-cored aluminium strand present position, calculate the fixedly interior wind load of span of described steel-cored aluminium strand;
With described steel-cored aluminium strand fixedly the additional load in the span deduct described wind load, obtain the fixedly ice coating load in the span of described steel-cored aluminium strand;
Obtain fixedly icing weight and the ice covering thickness in the span of described steel-cored aluminium strand according to described ice coating load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100894446A CN101620000B (en) | 2009-07-17 | 2009-07-17 | Calculating method of ice concentration of transmission line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100894446A CN101620000B (en) | 2009-07-17 | 2009-07-17 | Calculating method of ice concentration of transmission line |
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| CN101620000A CN101620000A (en) | 2010-01-06 |
| CN101620000B true CN101620000B (en) | 2011-09-07 |
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Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101929886B (en) * | 2010-07-08 | 2012-05-23 | 电子科技大学 | Method for measuring icing quality of power transmission conductor |
| CN102042885B (en) * | 2010-10-08 | 2012-05-23 | 电子科技大学 | Power transmission line tower line system state monitoring device |
| CN102261893A (en) * | 2011-04-29 | 2011-11-30 | 山西省电力公司电力科学研究院 | Online strain detection device for transmission towers |
| CN102721986B (en) * | 2012-06-01 | 2014-03-12 | 湖南省电力公司科学研究院 | Power grid ice coating long-term forecasting method on basis of subtropical anticyclone factor |
| CN103630078A (en) * | 2012-08-23 | 2014-03-12 | 北京邮电大学 | Overhead transmission line icing thickness detection apparatus and detection method |
| CN103076070A (en) * | 2013-01-05 | 2013-05-01 | 烟台睿创微纳技术有限公司 | Ice coating detection device for cable |
| CN103822737B (en) * | 2013-11-30 | 2018-07-10 | 国家电网公司 | A kind of Monitoring-fiber Bragg Grating on-line monitoring device for transmission line and method |
| CN104880269A (en) * | 2014-02-28 | 2015-09-02 | 国家电网公司 | Overhead line detection system and fiber grating weighing sensor thereof |
| CN105571691A (en) * | 2014-10-09 | 2016-05-11 | 梅特勒-托利多(常州)精密仪器有限公司 | Weighing sensor, weighing network, and monitoring method |
| CN104913727B (en) * | 2015-04-30 | 2017-08-25 | 广西电网有限责任公司电力科学研究院 | A kind of method of distributed measurement OPGW ice covering thickness |
| CN106338242B (en) * | 2015-07-15 | 2019-01-29 | 成都阜特科技股份有限公司 | A kind of wind generator set blade icing measuring method and its measuring device |
| CN106368913B (en) * | 2015-07-15 | 2019-03-22 | 成都阜特科技股份有限公司 | A kind of wind generator set blade icing measuring method |
| CN105698848B (en) * | 2015-12-14 | 2018-03-30 | 杭州九极科技有限公司 | A kind of intelligent ice thermal monitoring robot |
| CN105737745A (en) * | 2016-02-05 | 2016-07-06 | 国网浙江省电力公司杭州供电公司 | Power transmission line icing detection system |
| CN110986881A (en) * | 2019-12-17 | 2020-04-10 | 国网江苏省电力有限公司检修分公司 | Power transmission line icing on-line monitoring system based on meteorological temperature |
| CN111397708B (en) * | 2020-04-24 | 2021-08-03 | 上海交通大学 | Non-contact measuring device for ice amount of wet dust on surface of heat exchanger fin |
| CN113324489B (en) * | 2021-05-26 | 2023-01-24 | 贵州电网有限责任公司 | Equivalent icing thickness monitoring method based on accurate measurement of conductor sag change |
| CN114689005B (en) * | 2022-05-06 | 2022-10-04 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Icing monitoring method under uneven icing working condition |
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