WO2000075629A1 - Procede permettant de determiner la resistance thermique et ligne electrique - Google Patents
Procede permettant de determiner la resistance thermique et ligne electrique Download PDFInfo
- Publication number
- WO2000075629A1 WO2000075629A1 PCT/JP2000/003540 JP0003540W WO0075629A1 WO 2000075629 A1 WO2000075629 A1 WO 2000075629A1 JP 0003540 W JP0003540 W JP 0003540W WO 0075629 A1 WO0075629 A1 WO 0075629A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- temperature
- operating
- residual strength
- wire
- transmission line
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/028—One dimensional, e.g. filaments, wires, ropes or cables
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
Definitions
- the present invention relates to a method for determining thermal resistance of a transmission line.
- the thermal tolerance of conventional overhead transmission lines that is, the maximum operating temperature, is determined based on the thermal degradation characteristics of the materials that make up the transmission lines. For example, in the case of hard-wired strands (HA1), do as follows.
- the aluminum alloy that composes the transmission line is annealed at various temperatures for 1 hour, and the relationship between each temperature condition and tensile strength is examined and plotted (Fig. 5).
- heating is performed under several temperature conditions.
- the heat history is given to the aluminum alloy by changing the time, and the relationship between the heating time and the tensile strength is examined and graphed (Fig. 6).
- the “residual strength” in each figure indicates the ratio of the unheated material to the tensile strength.
- the temperature and the heating time at which the tensile strength of the aluminum alloy becomes 90% and the heating time are defined as the life, and the heating temperature and the heating time at which the material strength becomes 90% are obtained from the graphs of FIGS.
- the Arrhenius relationship (ln (t) «: ln (l / T) t: heating time (hr), T: heating temperature (k))
- an Arrhenius diagram is drawn from these two points. It becomes the graph of 7. From this figure, it is found that the allowable temperature of the electric wire for any use time is derived, and in this example, the heat resistance temperature is about 80 ° C for 36 years of use.
- a main object of the present invention is to provide a method for determining a heat resistance of a transmission line, which can more accurately determine the heat resistance of the transmission line according to the state of each transmission line. Disclosure of the invention
- the present invention has been made to achieve the above-mentioned object, and the feature of the present invention is that a wire sample is taken from an operation line, and a heat history including a plurality of temperatures is given to the sample to provide a wire temperature, a heating time, and a residual strength.
- the purpose of this study is to determine the correlation between the evaluation criteria and determine the working temperature of the operating line based on this correlation.
- Evaluation criteria for residual strength include tensile load, vibration fatigue limit stress, and creep amount.
- the evaluation criteria for the residual strength be at least the tensile load and the vibration fatigue limit stress, and that the lowest temperature among the operating temperatures determined based on each evaluation standard be the operating temperature of the operating electric wire.
- the temperature of the thermal history is a continuous permit under the provisions of the overhead power transmission regulations (J EAC 6001-1993). It is desirable to have a plurality of temperatures with a temperature difference of 20% or more of this allowable temperature, centered on the value of 150% of the storage temperature. In particular, it is preferable to set the temperature condition to 3 or more, since the thermal proof stress can be determined more accurately.
- the following may be performed.
- a wire sample is taken from the operating line, and a thermal history consisting of multiple temperatures is given to this sample to determine the correlation between the wire temperature, heating time, and evaluation criteria for residual strength.
- the target operating temperature is set, and the distribution of the wire temperature and the generation time of the temperature at the allowable current corresponding to the target temperature is obtained based on the weather conditions around the operating line.
- the degree of deterioration of the evaluation standard of the residual strength at each temperature is derived from the distribution result and the correlation, and it is determined whether or not operation at the target use temperature is possible from the result of accumulating the degree of deterioration at all temperatures. I do.
- Figure 1 is a graph showing the relationship between the heating time and the strength reduction rate in the thermal history of the removed electric wire as a sample.
- Fig. 2 is a graph obtained from the graph of Fig. 1 so that the correlation between the wire temperature, heating time and tensile strength characteristics is linear.
- Figure 3 is a graph showing the relationship between wire temperature and the time at which the temperature occurs.
- Figure 4 is a graph showing the relationship between the constant transmission capacity and the residual strength factor.
- Figure 5 is a graph showing the relationship between annealing temperature and tensile strength.
- FIG. 6 is a graph showing the relationship between the heating time and the tensile strength.
- FIG. 7 is a graph of an Arrhenius diagram showing the relationship between temperature and annealing time.
- the temperature conditions of the heat history were 100, 120, 140, 160 and 180, and the heating time at each temperature was 50, 100, 200, 400 and 800 hours.
- This temperature condition is based on the value of 150% of the continuous allowable temperature in the overhead power transmission regulations UEAC 6001-1993), and more accurate strength characteristics can be obtained if there are multiple temperatures with a temperature difference of 20% or more of this allowable temperature. Can be requested.
- the continuous allowable temperature of the ACSR in this example is 90. It is desirable that the heating time be long, but considering the temperature control of the heating furnace, etc., it is practical to be about 1,000 hours or less.
- Fig. 1 shows a graph of this strength characteristic.
- the “decrease rate” on the vertical axis represents 100 X (strength before heating-strength after heating) strength before heating.
- a graph of the correlation between wire temperature, heating time, and tensile strength characteristics is created based on the graph in Fig. 1 (see Fig. 2).
- the vertical axis is The “residual strength rate” is shown, and the horizontal axis is “thermal history exp ⁇ A ⁇ T—B + C ⁇ ln (h) ⁇ : T is the wire temperature (° C), h is the heating time (hrs). Find the constants A, B, and C so that the relationship is linear.
- “Residual strength ratio” is the percentage of post-heating strength to pre-heating strength, in other words, “100 percent reduction”.
- the residual strength rate in the graph of FIG. 2 is not the residual strength rate of the aluminum strand itself, but a residual strength rate converted to a stranded wire strength. This conversion is performed by multiplying the residual strength ratio of the aluminum wire by X / (X + Y), where X is the strength of the aluminum wire constituting the ACSR without thermal history and Y is the same strength of the steel wire. .
- the correlation between the wire temperature, the heating time and the tensile strength characteristics can be obtained, so if an arbitrary temperature and time are substituted in the equation “exp ⁇ 0.047 ⁇ T – 6.1 + 0.35 ⁇ ln (h) ⁇ ”, From the graph in Fig. 2, the residual strength ratio under that condition can be obtained. For example, if the residual strength ratio is 90% and the service life is 36 years (315,360 hours), the maximum operating temperature under these conditions can be obtained.
- the operating temperature is determined in consideration of the thermal degradation of the specific line that has received the thermal history.
- the wire temperature does not always reach the maximum operating temperature during the entire operation. Therefore, the heat resistance is determined by taking the following environmental conditions into account more accurately.
- the target operating temperature here, 105 ° C
- the allowable current capacity here, 119% of the conventional value
- the distribution of the wire temperature and the time at which the current occurs when this current is applied is calculated. Predict.
- weather data temperature, wind speed, solar radiation
- Figure 3 shows the distribution draft of the wire temperature. As shown in this graph, it can be seen that the time when the wire temperature is about 40 ° C is the longest, and the time when the wire temperature is below 10 ° C or above 80 ° C is very short.
- each temperature for example, in increments of 1 ° C
- its generation time can be expressed by the expression “exp ⁇ 0.047 ⁇ T—6.1 + 0.35 ⁇ ln (h) ⁇ ] ”and calculate the residual strength ratio at each temperature.
- the residual strength ratio is calculated for all temperatures, and the final residual strength ratio is obtained by accumulating the residual strength ratio for each temperature. If the final residual strength factor does not fall below the safety factor of 2.5 in the “Ministerial Ordinance on Technical Standards for Electrical Equipment”, it can be understood that operation at the target operating temperature is possible. Conversely, if a temperature as close as possible to the safety factor of 2.5 is determined by the same procedure as above, that temperature will be the operating temperature of the overhead transmission line with the highest availability.
- the method for determining thermal resistance according to the present invention is useful for determining the thermal resistance according to a line of an operating line that has undergone thermal history, using the wire as a sample.
- it is suitable for predicting the distribution of the wire temperature and the time of occurrence of the temperature in consideration of the surrounding environment of the operation line, and determining the thermal resistance together with the prediction results.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Electric Cable Installation (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00931635A EP1102056A4 (en) | 1999-06-02 | 2000-06-01 | METHOD FOR DETERMINING THERMAL RESISTANCE AND ELECTRIC LINE |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15569899A JP3948644B2 (ja) | 1999-06-02 | 1999-06-02 | 送電線の熱耐力決定方法 |
JP11/155698 | 1999-06-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000075629A1 true WO2000075629A1 (fr) | 2000-12-14 |
Family
ID=15611576
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2000/003540 WO2000075629A1 (fr) | 1999-06-02 | 2000-06-01 | Procede permettant de determiner la resistance thermique et ligne electrique |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1102056A4 (ja) |
JP (1) | JP3948644B2 (ja) |
KR (1) | KR100433302B1 (ja) |
WO (1) | WO2000075629A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114858583A (zh) * | 2022-07-05 | 2022-08-05 | 南通市通州区同胜电子电缆有限公司 | 一种电缆加工用低温拉伸检测装置 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4228375B2 (ja) * | 1999-06-02 | 2009-02-25 | 東京電力株式会社 | 送電線の熱耐力決定方法 |
JP2001198900A (ja) * | 2000-01-22 | 2001-07-24 | Yoshikazu Nakayama | 超微細探針によるリソグラフィ法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63134934A (ja) * | 1986-11-27 | 1988-06-07 | Kansai Electric Power Co Inc:The | 劣化診断方法および装置 |
EP0442205A2 (en) * | 1990-01-25 | 1991-08-21 | Westinghouse Electric Corporation | Method for monitoring the effects of thermal and radiation exposure |
JPH06331523A (ja) * | 1993-05-18 | 1994-12-02 | Kansai Electric Power Co Inc:The | 積層品の劣化診断方法 |
JPH11344433A (ja) * | 1998-06-03 | 1999-12-14 | Mitsubishi Cable Ind Ltd | 被覆ケーブルの劣化診断方法および余寿命推定方法 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000131379A (ja) * | 1998-10-28 | 2000-05-12 | Ando Electric Co Ltd | 電子部品の熱抵抗の測定方法、および測定システム |
-
1999
- 1999-06-02 JP JP15569899A patent/JP3948644B2/ja not_active Expired - Fee Related
-
2000
- 2000-06-01 KR KR10-2001-7001454A patent/KR100433302B1/ko not_active IP Right Cessation
- 2000-06-01 WO PCT/JP2000/003540 patent/WO2000075629A1/ja not_active Application Discontinuation
- 2000-06-01 EP EP00931635A patent/EP1102056A4/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63134934A (ja) * | 1986-11-27 | 1988-06-07 | Kansai Electric Power Co Inc:The | 劣化診断方法および装置 |
EP0442205A2 (en) * | 1990-01-25 | 1991-08-21 | Westinghouse Electric Corporation | Method for monitoring the effects of thermal and radiation exposure |
JPH06331523A (ja) * | 1993-05-18 | 1994-12-02 | Kansai Electric Power Co Inc:The | 積層品の劣化診断方法 |
JPH11344433A (ja) * | 1998-06-03 | 1999-12-14 | Mitsubishi Cable Ind Ltd | 被覆ケーブルの劣化診断方法および余寿命推定方法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1102056A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114858583A (zh) * | 2022-07-05 | 2022-08-05 | 南通市通州区同胜电子电缆有限公司 | 一种电缆加工用低温拉伸检测装置 |
Also Published As
Publication number | Publication date |
---|---|
KR100433302B1 (ko) | 2004-05-27 |
JP3948644B2 (ja) | 2007-07-25 |
EP1102056A4 (en) | 2005-06-15 |
JP2000346788A (ja) | 2000-12-15 |
KR20010072219A (ko) | 2001-07-31 |
EP1102056A1 (en) | 2001-05-23 |
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