CN111177641A - Wire temperature rise evaluation method under high wind speed - Google Patents
Wire temperature rise evaluation method under high wind speed Download PDFInfo
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- CN111177641A CN111177641A CN201911336407.0A CN201911336407A CN111177641A CN 111177641 A CN111177641 A CN 111177641A CN 201911336407 A CN201911336407 A CN 201911336407A CN 111177641 A CN111177641 A CN 111177641A
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Abstract
The invention discloses a wire temperature rise evaluation 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 measured and calculating the average value of the temperature T
Calculating the temperature T and the average value
of the absolute value of the difference Δ
and according to the mean value Delta
The temperature rise of the lead is evaluated under the condition of (1); the method can calculate or experiment the sharp increase of the temperature distribution nonuniformity of the lifting lead under the high wind speed, judge the nonuniformity of the temperature rise of the lead, and determine the maximum temperature of the lead by improving the calculation precisionThe large allowable current carrying capacity 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 method for evaluating temperature rise of a wire under a high wind speed.
Background
With the increase of the transmission voltage class (alternating current 1000kV and direct current +/-1100 kV), the method for improving the transmission capacity by improving the transmission voltage class is extremely used by human beings, and with the development of the calculation subject, the heat load capacity of the wire is researched again by various national scholars, 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 exploring the potential transmission capacity of the existing power grid. The nonuniformity of the temperature distribution of the wire is increased sharply along with the increase of the wind speed in calculation or experiment, and how to judge the nonuniformity of the temperature rise of the wire is lack of a corresponding method at present.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a method for evaluating the temperature rise of a lead at a high wind speed.
The technical problem to be solved by the invention is realized by the following technical scheme:
a method for evaluating temperature rise of a wire at a high wind speed comprises the following steps:
s1, obtaining the temperature T on the circumference of the cross section of each lead to be tested;
s2, calculating the average value of the temperature T on the circumference of the cross section of all the leads 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
Is the average of the sum of the absolute values of the differences of
S4, obtaining the average value according to the step S3
The wire temperature rise evaluation is realized.
Further, 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 thermometry method.
Further, in the step S2, the average value
The calculation formula of (a) 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 quantity of the arc of the cross section of the wire to be measured.
Further, in the step S3, the average value
The calculation formula of (a) is as follows:
further, in the step S4, when the step is executed
In time, the measuring point of the wire temperature rise evaluation selects the leeward of the wire to be measuredA side; when in use
In time, the measuring point of the temperature rise evaluation of the lead can select any position of the surface of the lead to be measured.
Preferably, the lead to be tested is an overhead bare lead.
The invention has the beneficial effects that:
the method can judge the nonuniformity of the temperature rise of the wire along with the sharp increase of the nonuniformity of the temperature distribution of the wire under the high wind speed of calculation or experiment based on the heat load capability technology of the wire, and then determines the maximum allowable current-carrying capacity of the wire by improving the calculation precision, thereby having important engineering value for excavating the potential power transmission capability 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
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of 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 lead at a high wind speed includes the following steps:
s1, acquiring the temperature T on the circumference of the cross section of each wire to be tested, wherein the cross section of each wire to be tested is shown in figure 2;
s2, calculating the average value of the temperature T on the circumference of the cross section of all the leads to be tested obtained in the step S1
S3, calculating the step S1The obtained temperature T of each lead wire to be measured on the circumference of the cross section and the average value obtained in the step S2
Is the average of the sum of the absolute values of the differences of
S4, obtaining the average value according to the step S3
The wire temperature rise evaluation is realized.
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 thermometry method.
In this embodiment, in the step S2, the average value is
The calculation formula of (a) 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 quantity of the arc of the cross section of the wire to be measured.
In this embodiment, in the step S3, the average value is
The calculation formula of (a) is as follows:
in this embodiment, in the step S4, when
Selecting the leeward side of the wire to be measured by a measuring point for evaluating the temperature rise of the wire; when in use
In time, the measuring point of the temperature rise evaluation of the lead can select any position of the surface of the lead to be measured.
In this embodiment, the wire to be measured is an overhead bare wire.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A method for evaluating temperature rise of a wire at a high wind speed is characterized by comprising the following steps: the method comprises the following steps:
s1, obtaining the temperature T on the circumference of the cross section of each lead to be tested;
s2, calculating the average value of the temperature T on the circumference of the cross section of all the leads 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
Is the average of the sum of the absolute values of the differences of
S4, obtaining the average value according to the step S3
The wire temperature rise evaluation is realized.
2. The method for evaluating the temperature rise of the lead under the high wind speed according to claim 1, wherein: in step S1, the temperature T on the circumference of the cross section of each wire to be measured is obtained by an optical fiber thermometry method.
3. The method for evaluating the temperature rise of the lead under the high wind speed according to claim 1, wherein: in the step S2, the average value
The calculation formula of (a) 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 quantity of the arc of the cross section of the wire to be measured.
4. The method for evaluating the temperature rise of the lead under the high wind speed according to claim 3, wherein: in the step S3, the average value
The calculation formula of (a) is as follows:
5. the method for evaluating the temperature rise of the lead under the high wind speed according to claim 1, wherein: in the step S4, when
Selecting the leeward side of the wire to be measured by a measuring point for evaluating the temperature rise of the wire; when in use
In time, the measuring point of the temperature rise evaluation of the lead can select any position of the surface of the lead to be measured.
6. The method for evaluating the temperature rise of the lead under the high wind speed according to claim 1, wherein the lead to be tested is an overhead bare lead.
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| Application Number | Priority Date | Filing Date | Title |
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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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| Application Number | Priority Date | Filing Date | Title |
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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 true CN111177641A (en) | 2020-05-19 |
| CN111177641B CN111177641B (en) | 2023-07-07 |
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Citations (5)
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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 |
| US20140241396A1 (en) * | 2013-02-28 | 2014-08-28 | Yokogawa Electric Corporation | Optical fiber temperature distribution measurement device and method of measuring optical fiber temperature distribution |
| 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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2019
- 2019-12-23 CN CN201911336407.0A patent/CN111177641B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US20140241396A1 (en) * | 2013-02-28 | 2014-08-28 | Yokogawa Electric Corporation | Optical fiber temperature distribution measurement device and method of measuring optical fiber temperature distribution |
| 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)
| Title |
|---|
| 周象贤;温典;王少华;刘岩;蒋愉宽;李特;: "高压架空输电线路分裂导线温度场仿真分析" * |
| 朱永灿;黄新波;贾建援;程丹;林淑凡;张烨;: "输电线路覆冰导线对流换热的数值模拟" * |
| 胡剑 等: "基于热网络模型的架空输电线路径向和周向温度计算方法" * |
| 高强;陈希;侯继勇;仝杰;雷煜卿;: "OPPC表面温度场与流场的数值模拟研究" * |
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