CN111177641B - Wire temperature rise assessment method under high wind speed - Google Patents
Wire temperature rise assessment method under high wind speed Download PDFInfo
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- CN111177641B CN111177641B CN201911336407.0A CN201911336407A CN111177641B CN 111177641 B CN111177641 B CN 111177641B CN 201911336407 A CN201911336407 A CN 201911336407A CN 111177641 B CN111177641 B CN 111177641B
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Abstract
The invention discloses a wire temperature rise assessment method under high wind speed, which comprises the steps of obtaining the temperature T on the circumference of the cross section of each wire to be tested and calculating the average value of the temperature T
Calculating the temperature T and the average value
Is the average value of the sum of absolute values of the differences of (a)
According to the average value
The condition of (1) realizes the temperature rise evaluation of the lead; the method can calculate or experiment the uneven increase of the temperature distribution of the lifting wire at a high wind speed, judge the uneven increase of the temperature of the wire, then determine the maximum allowable current-carrying capacity of the wire by improving the calculation precision, and has important engineering value for excavating the potential power transmission capacity of the existing power grid.
Description
Technical Field
The invention belongs to the field of power transmission and transformation, and particularly relates to a wire temperature rise assessment method under high wind speed.
Background
With the improvement of the power transmission voltage level (1000 kV alternating current and 1100kV direct current), the mode of improving the power transmission capacity by improving the power transmission voltage level is extremely used by human beings, and with the development of computational disciplines, the scholars of each country re-study the heat load capacity of the wire, and the maximum allowable current-carrying capacity of the wire is determined by improving the computational accuracy, so that the method has important engineering value for mining the potential power transmission capacity of the existing power grid. With the rapid increase of the wire temperature distribution nonuniformity in the calculation or experiment of the wind speed, how to judge the nonuniformity of the wire temperature rise is lacking in a corresponding method at present.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a wire temperature rise assessment method under high wind speed.
The invention solves the technical problems by the following technical proposal:
the wire temperature rise assessment method under high wind speed comprises the following steps:
s1, acquiring the temperature T on the circumference of the cross section of each wire to be tested;
s2, calculating the average value of the temperatures T on the circumferences of the cross sections of all the wires to be tested obtained in the step S1
S3, calculating the temperature T on the circumference of the cross section of each wire to be tested obtained in the step S1 and the average value obtained in the step S2
Absolute value of the difference of (2)Average value of the sum of values ∈ ->
S4, obtaining an average value according to the step S3
The condition of (2) realizes the wire temperature rise assessment.
Further, in the step S1, the temperature T on the circumference of the cross section of each wire to be measured is obtained by using an optical fiber temperature measurement method.
Further, in the step S2, an average value
The calculation formula of (2) is as follows:
the integration is performed along the arc of the cross section of the wire to be measured, and dl is the differential value of the arc of the cross section of the wire to be measured.
Further, in the step S3, an average value
The calculation formula of (2) is as follows:
further, in the step S4, when
When the temperature rise of the wire is estimated, the lee side of the wire to be measured is selected by the measuring point; when->
And when the temperature rise of the wire is estimated, the measuring point can be selected to be any position on the surface of the wire to be measured.
Preferably, the wire to be tested is an overhead bare wire.
The beneficial effects of the invention are as follows:
according to the invention, based on the thermal load capacity technology of the wire, the temperature distribution non-uniformity of the wire is increased sharply along with the calculation or experiment of the temperature distribution non-uniformity of the wire at a high wind speed, the non-uniformity of the temperature rise of the wire is judged, and then the maximum allowable current-carrying capacity of the wire is determined by improving the calculation precision, so that the method has important engineering value for excavating the potential power transmission capacity of the existing power grid.
Drawings
Fig. 1 is a flow chart of the present invention.
Fig. 2 is a cross-sectional view of a wire under test of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Examples
As shown in fig. 1, a method for evaluating temperature rise of a wire under high wind speed includes the following steps:
s1, acquiring the temperature T on the circumference of each wire cross section to be measured, wherein the wire cross section to be measured is shown in FIG. 2;
s2, calculating the average value of the temperatures T on the circumferences of the cross sections of all the wires to be tested obtained in the step S1
S3, calculating the temperature T on the circumference of the cross section of each wire to be tested obtained in the step S1 and the average value obtained in the step S2
Absolute value of the difference between (a) and (b)Average value of sum->
S4, obtaining an average value according to the step S3
The condition of (2) realizes the wire temperature rise assessment.
In this embodiment, in step S1, the temperature T on the circumference of the cross section of each wire to be measured is obtained by using an optical fiber temperature measurement method.
In this embodiment, in the step S2, the average value
The calculation formula of (2) is as follows:
the integration is performed along the arc of the cross section of the wire to be measured, and dl is the differential value of the arc of the cross section of the wire to be measured.
In this embodiment, in the step S3, the average value
The calculation formula of (2) is as follows:
in this embodiment, in the step S4, when
When the temperature rise of the wire is estimated, the lee side of the wire to be measured is selected by the measuring point; when->
And when the temperature rise of the wire is estimated, the measuring point can be selected to be any position on the surface of the wire to be measured.
In this embodiment, the to-be-tested wire is an overhead bare wire.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (4)
1. A wire temperature rise assessment method under high wind speed is characterized in that: the method comprises the following steps:
s1, acquiring the temperature T on the circumference of the cross section of each wire to be tested;
s2, calculating the average value of the temperatures T on the circumferences of the cross sections of all the wires to be tested obtained in the step S1
S3, calculating the temperature T on the circumference of the cross section of each wire to be tested obtained in the step S1 and the average value obtained in the step S2
Average value of the sum of absolute values of the differences +.>
S4, obtaining an average value according to the step S3
The condition of (1) realizes the temperature rise evaluation of the lead;
in the step S2, the average value
The calculation formula of (2) is as follows:
the integration is carried out along the arc of the cross section of the wire to be measured, and dl is the differential value of the arc of the cross section of the wire to be measured;
in the step S4, when
When the temperature rise of the wire is estimated, the lee side of the wire to be measured is selected by the measuring point; when (when)
And when the temperature rise of the wire is estimated, the measuring point can be selected to be any position on the surface of the wire to be measured.
2. The method for evaluating the temperature rise of a wire at a high wind speed according to claim 1, wherein the method comprises the following steps: in the step S1, the temperature T on the circumference of the cross section of each wire to be measured is obtained by using an optical fiber temperature measurement method.
3. The method for evaluating the temperature rise of a wire at a high wind speed according to claim 1, wherein the method comprises the following steps: in the step S3, the average value
The calculation formula of (2) is as follows:
4. the method for evaluating the temperature rise of a wire under high wind speed according to claim 1, wherein the wire to be tested is an overhead bare wire.
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| CN201911336407.0A CN111177641B (en) | 2019-12-23 | 2019-12-23 | Wire temperature rise assessment method under high wind speed |
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| CN111177641A CN111177641A (en) | 2020-05-19 |
| CN111177641B true CN111177641B (en) | 2023-07-07 |
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| GB1542916A (en) * | 1975-12-03 | 1979-03-28 | Achenbach Buschhuetten Gmbh | Method and apparatus for controlling the flatness of strip material |
| RU2189019C2 (en) * | 2000-11-29 | 2002-09-10 | Научно-исследовательский центр прикладной электродинамики Казанского государственного технического университета им. А.Н.Туполева | Method of contactless measurements of average volume temperature of object made from dielectric material |
| CN109766659A (en) * | 2019-01-28 | 2019-05-17 | 重庆科技学院 | A kind of conductor sag calculation method for considering wind load and conduction time and influencing |
| CN109973332A (en) * | 2017-12-27 | 2019-07-05 | 浙江中自庆安新能源技术有限公司 | Blade of wind-driven generator icing on-line monitoring method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5742861B2 (en) * | 2013-02-28 | 2015-07-01 | 横河電機株式会社 | Optical fiber temperature distribution measuring device |
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2019
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|---|---|---|---|---|
| GB1542916A (en) * | 1975-12-03 | 1979-03-28 | Achenbach Buschhuetten Gmbh | Method and apparatus for controlling the flatness of strip material |
| RU2189019C2 (en) * | 2000-11-29 | 2002-09-10 | Научно-исследовательский центр прикладной электродинамики Казанского государственного технического университета им. А.Н.Туполева | Method of contactless measurements of average volume temperature of object made from dielectric material |
| CN109973332A (en) * | 2017-12-27 | 2019-07-05 | 浙江中自庆安新能源技术有限公司 | Blade of wind-driven generator icing on-line monitoring method and device |
| CN109766659A (en) * | 2019-01-28 | 2019-05-17 | 重庆科技学院 | A kind of conductor sag calculation method for considering wind load and conduction time and influencing |
Non-Patent Citations (4)
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