CN114528705A - Fatigue damage estimation method for power transmission line ground wire - Google Patents

Fatigue damage estimation method for power transmission line ground wire Download PDF

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CN114528705A
CN114528705A CN202210153226.XA CN202210153226A CN114528705A CN 114528705 A CN114528705 A CN 114528705A CN 202210153226 A CN202210153226 A CN 202210153226A CN 114528705 A CN114528705 A CN 114528705A
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transmission line
power transmission
frequency
line
vibration
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CN114528705B (en
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谭文龙
夏荣
付思诗
张迪
杨展
吴嘉琪
黄昱霖
王永安
吴星奇
张楚谦
周山
聂葳
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Super High Voltage Co Of State Grid Hubei Electric Power Co ltd
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Super High Voltage Co Of State Grid Hubei Electric Power Co ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications

Abstract

The invention provides a fatigue damage estimation method for a conducting and grounding wire of a power transmission line, which comprises the steps of selecting the conducting and grounding wire of the power transmission line to be estimated, combining an S-N characteristic curve of the wire and comparing a calculation result with operation data.

Description

Fatigue damage estimation method for power transmission line ground wire
Technical Field
The invention relates to the field of power transmission lines, in particular to a method for estimating fatigue damage of a ground wire of a power transmission line.
Background
A power transmission conductor vibration event can lead to fatigue damage of the power transmission conductor, thereby affecting the service life of the power transmission line. The method is characterized in that a critical dynamic bending stress value which can cause fatigue failure is obtained by observing or carrying out fatigue experiments on a power transmission conductor in a certain area for a long time, and the critical dynamic bending stress value is used as an evaluation standard for judging whether the power transmission conductor is safe or not. The traditional method has obvious defects, can only qualitatively evaluate whether the power transmission conductor is subjected to fatigue damage, cannot consider the fatigue life difference caused by the difference of meteorological environments of all parts, and also takes a large amount of time in the evaluation process. Therefore, how to design a scientific and effective method to evaluate the fatigue damage condition of the ground wire is a problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a method for estimating the fatigue damage of the ground wire of the power transmission line aiming at the defects of the prior art, which can estimate the fatigue damage condition of the ground wire.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for estimating the fatigue damage of a conducting wire and a ground wire of a power transmission line, which comprises the following steps:
s1, selecting a transmission line grounding wire needing to be evaluated, and collecting and summarizing historical breeze vibration monitoring data of the OPGW of the line;
s2, combining the S-N characteristic curve of the line, and adopting Miner damage accumulation criterion to carry out annual or monthly fatigue accumulation damage statistics on each span of the line;
and S3, comparing the calculation result with the operation data to obtain a line damage evaluation result.
Further, in S1, the power transmission line to be evaluated is selected, and when the aeolian vibration occurs, the vibration frequency f is set to be lower than the vibration frequency fcWith wind speed UcThe relationship is as follows:
Figure BDA0003511211550000021
wherein S is the Strouhal number, and the engineering boundary of China generally takes 0.2; and D is the diameter of the transmission line.
Further, the vibration frequency of the line is less than the vibration frequency fcThe probability of (c) is:
Figure BDA0003511211550000022
in practical calculation, all frequency ranges in which the breeze vibration is likely to occur are divided into a plurality of small frequency bands, i-th frequency fi∈[fi low,fi up]The probability of occurrence of vibration is calculated as:
Figure BDA0003511211550000023
the power transmission line is at the ith frequency f within one yeariThe total time of internal vibration is as follows:
Figure BDA0003511211550000024
further, the vibration time in each frequency band is added to obtain the total vibration time of the power transmission line in all possible frequency domains, which is obtained by the possible occurrence of breeze vibration, and comprises the following steps:
Figure BDA0003511211550000031
at said frequency fiThe annual damage rate of the following vibrations:
Figure BDA0003511211550000032
wherein f isdThe appropriate wind direction probability is determined by combining a wind direction graph with the span trend; n is a radical ofiFatigue life at this frequency.
Further, said NiThe calculation method is as follows:
SmNi＝Ci(1-di-1)Ci-1
wherein S is the stress amplitude, CiAnd Ci-1Is the material constant at frequencies i and i-1, m is the material constant, di-1The damage value is the effect of frequency i-1.
Further, the expression of the S-N characteristic curve is:
lg Ni＝lg((1-di-1)Ci-1)-m lg Si
thus, it is possible to obtain:
Figure BDA0003511211550000033
further, according to historical accumulated fatigue damage of the line span, historical overall operating state evaluation of the span is given, and the design working age of the line is recorded as DyearThe total operating time of the line is t years, the historical accumulated fatigue damage of the span is Dam, and a is a safety factor, wherein a is less than 1;
when in use
Figure BDA0003511211550000041
The evaluation result is that the circuit operates normally;
when in use
Figure BDA0003511211550000042
The evaluation result indicates that the line runs with potential risks;
when in use
Figure BDA0003511211550000043
The evaluation results are highly risky for the line to operate.
The invention has the beneficial effects that: the method combines the fatigue performance S-N curve of the lead and ground wires and the OPGW vibration event data feedback of the power transmission line, and adopts Miner damage accumulation criterion to evaluate the accumulated fatigue damage and risk of the power transmission line, thereby scientifically evaluating the service life of the lead and ground wires and providing decision basis for operation and maintenance personnel.
Fatigue life differences caused by various meteorological environment differences are comprehensively considered, and the evaluation result is more objective;
whether the transmission conductor is subjected to fatigue failure or not is evaluated in a quantitative mode, and the evaluation result is more accurate by using a related traditional method;
the evaluation can be carried out only by collecting historical data of the past year, and the evaluation process saves more time.
The technical scheme provided by the invention has wide application and obvious social benefit and economic benefit.
Drawings
FIG. 1 is a flowchart illustrating a method for estimating fatigue damage of a ground wire and a conducting wire of a power transmission line according to the present invention;
FIG. 2 is a flow chart of an improved S-N curve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A fatigue damage estimation method for a conducting wire and a ground wire of a power transmission line comprises the following steps:
s1, selecting a transmission line grounding wire needing to be evaluated, and collecting and summarizing historical breeze vibration monitoring data of the OPGW of the line;
s2, combining the S-N characteristic curve of the line, and adopting Miner damage accumulation criterion to carry out annual or monthly fatigue accumulation damage statistics on each span of the line;
and S3, comparing the calculation result with the operation data to obtain a line damage evaluation result.
In S1, the power transmission line to be evaluated is selected, and when the power transmission line vibrates in breeze, the vibration frequency f is selectedcWith wind speed UcThe relationship is as follows:
Figure BDA0003511211550000051
wherein S is the Strouhal number, and the engineering boundary of China generally takes 0.2; and D is the diameter of the transmission line.
The vibration frequency of the line is less than the vibration frequency fcThe probability of (c) is:
Figure BDA0003511211550000052
in practical calculation, all frequency ranges in which the breeze vibration is likely to occur are divided into a plurality of small frequency bands, i-th frequency fi∈[fi low,fi up]The probability of occurrence of vibration is calculated as:
Figure BDA0003511211550000053
the power transmission line is at the ith frequency f within one yeariThe total time of internal vibration is as follows:
Figure BDA0003511211550000054
adding the vibration time in each frequency band to obtain the total vibration time of the power transmission line in all possible frequency domains, wherein the total vibration time is obtained by the following steps:
Figure BDA0003511211550000061
at said frequency fiThe annual damage rate of the following vibrations:
Figure BDA0003511211550000062
wherein f isdThe appropriate wind direction probability is determined by combining a wind direction graph with the span trend; n is a radical ofiFatigue life at this frequency.
Said N isiThe calculation method is as follows:
SmNi＝Ci(1-di-1)Ci-1
wherein S is the stress amplitude, CiAnd Ci-1Is the material constant at frequencies i and i-1, m is the material constant, di-1The damage value is the effect of frequency i-1.
The expression of the S-N characteristic curve is as follows:
lg Ni＝lg((1-di-1)Ci-1)-m lg Si
thus, it is possible to obtain:
Figure BDA0003511211550000063
the S-N curve is modified to obtain more accurate results. The specific mode is as follows: in the invention, a loading block is arranged for carrying out amplitude variation loading until the ground lead wire is damaged, and the specific flow of improving the S-N curve is shown in figure 2 if the number of stress amplitudes in the loading block is M.
According to the historical accumulated fatigue damage of the line span, giving out the historical overall running state evaluation of the span, and recording the working life of the line design as DyearThe total operating time of the line is t years, the historical accumulated fatigue damage of the span is Dam, and a is a safety factor, wherein a is less than 1;
when in use
Figure BDA0003511211550000071
The evaluation result is that the circuit operates normally;
when in use
Figure BDA0003511211550000072
The evaluation result indicates that the line runs with potential risks;
when in use
Figure BDA0003511211550000073
The evaluation results are highly risky for the line to operate.
Example one
The operational data of 220kV peach line No. 41-No. 42 pole towers in 2020 years is selected for demonstration, the overall operational time t of the line is 9.75 years, and the fatigue life is designed according to the line for 30 years, so that the historical overall design damage of the line is as follows:
Figure BDA0003511211550000074
the calculation result of the historical accumulated fatigue damage is as follows:
Dam＝0.296875
due to the fact that
Figure BDA0003511211550000075
And the historical overall running state of the gear distance is evaluated as normal running, and no potential risk exists. Based on the above specific cases, the correctness of the present invention can be verified.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims (7)

1. A fatigue damage estimation method for a conducting wire and a ground wire of a power transmission line is characterized by comprising the following steps:
s1, selecting a transmission line grounding wire needing to be evaluated, and collecting and summarizing historical breeze vibration monitoring data of the OPGW of the line;
s2, combining the S-N characteristic curve of the line, and adopting Miner damage accumulation criterion to carry out annual or monthly fatigue accumulation damage statistics on each span of the line;
and S3, comparing the calculation result with the operation data to obtain a line damage evaluation result.
2. The method for estimating fatigue damage of ground and conducting wires of power transmission line according to claim 1, wherein in S1, the power transmission line to be evaluated is selected, and when breeze vibration occurs, the vibration frequency f is selectedcWith wind speed UcThe relationship is as follows:
Figure FDA0003511211540000011
wherein S is the Strouhal number, and the engineering boundary of China generally takes 0.2; and D is the diameter of the transmission line.
3. The method for estimating fatigue damage of ground wires and wires of power transmission line according to claim 2, wherein the vibration frequency of the line is less than the vibration frequency fcThe probability of (c) is:
Figure FDA0003511211540000012
in practical calculation, all frequency ranges in which the breeze vibration is likely to occur are divided into a plurality of small frequency bands, i-th frequency fi∈[fi low,fi up]The probability of occurrence of vibration is calculated as:
Figure FDA0003511211540000021
the power line is at the ith frequency f in one yeariThe total time of internal vibration is as follows:
Figure FDA0003511211540000022
4. the method for estimating the fatigue damage of the ground wire and the conducting wire of the power transmission line according to claim 3, wherein the method comprises the following steps: adding the vibration time in each frequency band to obtain the total vibration time of the power transmission line in all possible frequency domains, wherein the total vibration time is obtained by the following steps:
Figure FDA0003511211540000023
at said frequency fiThe annual damage rate of the following vibrations:
Figure FDA0003511211540000024
wherein f isdThe appropriate wind direction probability is determined by combining a wind direction graph with the span trend; n is a radical ofiFatigue life at this frequency.
5. The method for estimating fatigue damage of ground and conducting wires of power transmission line according to claim 4, wherein N isiThe calculation method is as follows:
SmNi＝Ci(1-di-1)Ci-1
wherein S is the stress amplitude, CiAnd Ci-1Is the material constant at frequencies i and i-1, m is the material constant, di-1The damage value is the effect of frequency i-1.
6. The method for estimating the fatigue damage of the ground wire and the conducting wire of the power transmission line according to claim 5, wherein the expression of the S-N characteristic curve is as follows:
lg Ni＝lg((1-di-1)Ci-1)-mlgSi
thus, it is possible to obtain:
Figure FDA0003511211540000031
7. the method for estimating the fatigue damage of the ground wire and the conducting wire of the power transmission line according to claim 6, wherein the method comprises the following steps: according to the historical accumulated fatigue damage of the line span, giving out the historical overall running state evaluation of the span, and recording the working life of the line design as DyearThe total operating time of the line is t years, the historical accumulated fatigue damage of the span is Dam, and a is a safety factor, wherein a is less than 1;
when in use
Figure FDA0003511211540000032
The evaluation result is that the circuit operates normally;
when in use
Figure FDA0003511211540000033
The evaluation result indicates that the line runs with potential risks;
when in use
Figure FDA0003511211540000034
The evaluation results are highly risky for the line to operate.
CN202210153226.XA 2022-02-18 2022-02-18 Fatigue damage estimation method for ground wire of power transmission line Active CN114528705B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150176237A1 (en) * 2013-12-23 2015-06-25 2HOffshore, Inc. Riser Fatigue Monitoring
CN105258780A (en) * 2015-09-22 2016-01-20 广东电网有限责任公司佛山供电局 On-line monitoring method for monitoring aeolian vibration of power transmission line
CN108444823A (en) * 2018-02-28 2018-08-24 三峡大学 A kind of large span power transmission conducting wire Prediction method for fatigue life considering multifactor impact
CN109918854A (en) * 2019-04-09 2019-06-21 国网江苏省电力有限公司电力科学研究院 A kind of composite insulation cross arm endurance quality appraisal procedure and device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150176237A1 (en) * 2013-12-23 2015-06-25 2HOffshore, Inc. Riser Fatigue Monitoring
CN105258780A (en) * 2015-09-22 2016-01-20 广东电网有限责任公司佛山供电局 On-line monitoring method for monitoring aeolian vibration of power transmission line
CN108444823A (en) * 2018-02-28 2018-08-24 三峡大学 A kind of large span power transmission conducting wire Prediction method for fatigue life considering multifactor impact
CN109918854A (en) * 2019-04-09 2019-06-21 国网江苏省电力有限公司电力科学研究院 A kind of composite insulation cross arm endurance quality appraisal procedure and device

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
仝步升等: "架空输电线路微风振动监测与疲劳损伤计算研究", 《水电能源科学》 *
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