CN102867119A - Method and device for estimating state of oil-immersed transformer - Google Patents

Method and device for estimating state of oil-immersed transformer Download PDF

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CN102867119A
CN102867119A CN2012103259305A CN201210325930A CN102867119A CN 102867119 A CN102867119 A CN 102867119A CN 2012103259305 A CN2012103259305 A CN 2012103259305A CN 201210325930 A CN201210325930 A CN 201210325930A CN 102867119 A CN102867119 A CN 102867119A
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hif
transformer
health
oil
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CN102867119B (en
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李军浩
张亮
韩彦华
郭磊
张文星
黄国强
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SHAANXI COUNTY ELECTRIC POWER CO Ltd
Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
Xian Jiaotong University
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SHAANXI COUNTY ELECTRIC POWER CO Ltd
Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
Xian Jiaotong University
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Abstract

The invention relates to a method for estimating a state of an oil-immersed transformer. A state estimation index HI is obtained according to a theoretical health index HI1 of the transformer and a test health index HI2 of the transformer; the index HI is used for estimating a health state of the transformer, wherein a is more than 0 and less than 1, represents a proportion coefficient of the theoretical health index HI1 and meets the expression that HI=aHI1+(1-a)HI2; and a maintenance strategy of the transformer is called according to the obtained HI. Due to the theoretical health index and the test health index, the transformer maintenance work in the prior is simplified in a simple and complete manner.

Description

A kind of oil-filled transformer state evaluating method and device thereof
 
Technical field
The present invention relates to technical field of electricity, relate in particular to a kind of oil-filled transformer state evaluating method and device thereof.
Background technology
Along with developing rapidly of China's power industry, power transformer is just towards UHV (ultra-high voltage), jumbo future development, power network also just are being organized into huge regional even trans-regional large electrical network, and transferring electricity from the west to the east, mutually confession of north and south, a national electrical network general layout that networks form.Yet, along with the increase of power equipment capacity and the expansion of electrical network scale, safe operation and the power supply reliability of electric system being had higher requirement, alarm bell has also been beaten for China's electric system by the U.S. that in recent years occurs " western part have a power failure on a large scale accident ".With a very important position in electric system of oil-immersed power transformer is one of electrical equipment most important and the most expensive in the electric system, and the safe reliability of its operation is directly connected to the safety and stablization of electric system.Therefore, improve power transformer particularly the large-scale power transformer reliability of operation safe and reliable operation tool of whole electrical network is of great significance.
Except improving its reliability in the design of transformer manufacture process, more crucial is to improve its maintenance and required level of service in the operational process of transformer.For a long time, China's electric system all adopts the prophylactic repair pattern to the Strategies of Maintenance of transformer.Namely no matter the structure of this transformer how, how are the technical merit of manufacturing firm and product quality, and whether the situations such as outlet short circuit occured, and all carry out periodic maintenance according to relevant criterion.On the one hand, no matter the state of this transformer how, to the stipulated time tend to cause the transformer that do not need to overhaul " ask for great treatment only minor illness or anosis also control " with regard to the mode of overhauling, in the situation that equipment defective not yet occurs, can normally move just stop transport maintenance even exchange device more, can cause the waste of a large amount of human and material resources, financial resources.Simultaneously and since during overhaul in the air moisture and dust enter transformer, make the transformer that does not need overhaul may cause on the contrary that after overhaul its dielectric level descends, and has increased the possibility that causes the new hidden danger of transformer in the maintenance process.On the other hand, to having major defect or fault, really needing the transformer of overhaul owing to not carrying out large repairs in time to the time between overhaul, make the defective development cause accident to occur, can not guarantee the safe operation of electrical network.
Summary of the invention
The present invention is intended to solve this technical matters of state estimation of transformer and has proposed a kind of oil-filled transformer state evaluating method, it is characterized in that:
Step (1): the theoretical health index HI that obtains transformer 1, described index HI 1Greater than 0, and described index HI 1It is the theoretical value that the insulation ag(e)ing rule according to transformer oilpaper self calculates;
Step (2): the test health index HI that obtains transformer 2, described index HI 2Greater than 0, and described index HI 2Be to determine according to the test findings to transformer, described test findings comprises body oil chromatography index HIF 1, body oil index HIF 2, body dielectric loss index HIF 3, load factor HIF 4, historical failure index HIF 5, sleeve pipe dielectric loss index HIF 6, polarization index HIF 7, direct current resistance HIF 8, shelf depreciation index HIF 9, on-load voltage regulating switch oil chromatography index HIF 10, and on-load voltage regulating switch oil index HIF 11, and HIF 1To HIF 11All greater than 0;
Step (3): obtain state estimation index HI, described index HI is for assessment of the health status of transformer, wherein 0＜
Figure 100332DEST_PATH_IMAGE001
＜1,
Figure 926205DEST_PATH_IMAGE001
Representation theory health index HI 1Scale-up factor, and satisfy:
；
Step (4): take gained HI as foundation, call the maintenance strategy of transformer.
In addition, the invention also discloses the device of implementing above-mentioned appraisal procedure, it is characterized in that, described device comprises:
Theoretical health index acquiring unit is in order to obtain the theoretical health index HI of transformer 1, described index HI 1Greater than 0, and described index HI 1It is the theoretical value that the insulation ag(e)ing rule according to transformer oilpaper self calculates;
Test health index acquiring unit is in order to obtain the test health index HI of transformer 2, described index HI 2Greater than 0, and described index HI 2Be to determine according to the test findings to transformer, described test findings comprises body oil chromatography index HIF 1, body oil index HIF 2, body dielectric loss index HIF 3, load factor HIF 4, historical failure index HIF 5, sleeve pipe dielectric loss index HIF 6, polarization index HIF 7, direct current resistance HIF 8, shelf depreciation index HIF 9, on-load voltage regulating switch oil chromatography index HIF 10, and on-load voltage regulating switch oil index HIF 11, and HIF 1To HIF 11All greater than 0;
State estimation index acquiring unit, in order to obtaining state estimation index HI, described index HI is for assessment of the health status of transformer, wherein 0＜ ＜1,
Figure 29531DEST_PATH_IMAGE001
Representation theory health index HI 1Scale-up factor, and satisfy:
Figure 709911DEST_PATH_IMAGE002
；
The maintenance strategy call unit in order to foundation gained HI, calls the maintenance strategy of transformer.
Embodiment
Understand the present invention for ease of those skilled in the art, special the invention will be further described.
For this technical scheme of oil-filled transformer state evaluating method disclosed in this invention, it is characterized in that:
Step (1): the theoretical health index HI that obtains transformer 1, described index HI 1Greater than 0, and described index HI 1It is the theoretical value that the insulation ag(e)ing rule according to transformer oilpaper self calculates;
Step (2): the test health index HI that obtains transformer 2, described index HI 2Greater than 0, and described index HI 2Be to determine according to the test findings to transformer, described test findings comprises body oil chromatography index HIF 1, body oil index HIF 2, body dielectric loss index HIF 3, load factor HIF 4, historical failure index HIF 5, sleeve pipe dielectric loss index HIF 6, polarization index HIF 7, direct current resistance HIF 8, shelf depreciation index HIF 9, on-load voltage regulating switch oil chromatography index HIF 10, and on-load voltage regulating switch oil index HIF 11, and HIF 1To HIF 11All greater than 0;
Step (3): obtain state estimation index HI, described index HI is for assessment of the health status of transformer, wherein 0＜
Figure 449197DEST_PATH_IMAGE001
＜1, Representation theory health index HI 1Scale-up factor, and satisfy:
；
Step (4): take gained HI as foundation, call the maintenance strategy of transformer.
With regard to technique scheme step (1), described theoretical health index HI 1It is the theoretical value that the insulation ag(e)ing rule according to transformer oilpaper self calculates.To those skilled in the art, transformer adopts the paper oil insulation structure usually, in very long operational process, because electricity, hot equal stress, particularly under the effect of thermal stress, paper oil insulation can wear out gradually, and its ageing process also is gradually deteriorated process of equipment.Just on this point, theoretical health index HI 1It is the theoretical value that the insulation ag(e)ing rule according to transformer oilpaper self calculates.
With regard to technique scheme step (2), theoretically, at HI 2Calculating in, all tests for transformer can be included in fact, consider in the practice that the parameter of transformer itself is numerous, what adopt among the present invention then is described 11 parameters of step (2).
With regard to technique scheme step (3), those skilled in the art can understand core concept of the present invention accordingly, and the state estimation index HI among the present invention obviously is a numerical value that characterizes current transformer health degree that obtains as the basis take the aging rule of transformer and above-mentioned every test findings.In the practice, applicant's discovery, theoretical health index and test health index all can exert an influence to the transformer health status, just from this thinking, technical scheme of the present invention have been arranged.For the HI among this embodiment, HI 1, HI 2, because transformer begins to move towards deterioration in case operation just means health, from its physical significance, it is worth obviously greater than 0.Generally speaking, in order to discuss conveniently, can artificially stipulate HI 1, HI 2Maximal value, maximal value is 10 such as making, so according to such scheme, obviously the maximal value of HI also is 10, when getting 10, just means the no good cake of health status that this index reflects, correspondingly, its value is more near 0, then equipment state is better.Preferably,
Figure 409347DEST_PATH_IMAGE003
, it is preferred, =0.4.Certainly, the transformer of that use different regions, different brands, model, because the difference of working environment,
Figure 870863DEST_PATH_IMAGE001
Other better spans may be arranged.
Although theoretical health index HI 1It is the theoretical value that the insulation ag(e)ing rule according to transformer oilpaper self calculates, but because running state of transformer relates to many kinds of parameters, the formula that does not have at present the unified described aging rule of sign all is various experimental formulas or the algorithm that each department or each company adopt more in the practice.More well-known is, a health index Ageing Model formula of Britain EA company, this formula is based on the experimental formula ageing equipment principle, embodiment device general level of the health index temporal evolution process, be widely used at present the health status assessment of Britain and North America power equipment, this formula form is as follows:
，
In the formula: HI 0The initial health index of indication transformer is generally 0.5; B represents aging coefficient, and is relevant with the expected life of transformer; T 1The aging initial time of expression is generally transformer and puts into operation the time; T 2The time of the correspondence that expression will be calculated.
Similarly, in another embodiment, HI 2Calculating also be to adopt various experimental formulas, take following computing formula as example:
Figure 15722DEST_PATH_IMAGE005
?，
In the formula: K iExpression HIF iWeight coefficient,
Figure 96811DEST_PATH_IMAGE006
Expression HIF 1To HIF 9About HI 2Scale-up factor, 0＜
Figure 571655DEST_PATH_IMAGE006
＜1.With regard to this formula, it can be so that test findings contains 11 kinds of factors that the present invention investigates, and on this point, appraisal procedure of the present invention also is more complete.Similarly, HI 1, HI 2, HIF 1To HIF 11Maximal value all can get 10.Preferably, ,
Figure 873247DEST_PATH_IMAGE006
=0.6, preferred,
Figure 859657DEST_PATH_IMAGE001
=0.4,
Figure 556218DEST_PATH_IMAGE006
=0.6.Certainly, the transformer of that use different regions, different brands, model, because the difference of working environment,
Figure 919066DEST_PATH_IMAGE001
,
Figure 518937DEST_PATH_IMAGE006
Other better spans may be arranged.
Preferably, in another embodiment, if establish HI 1Maximal value be 10, HI 0Get 0.5, then have:
Figure 410669DEST_PATH_IMAGE007
。
Especially, the invention also discloses be used to the device of implementing above-mentioned appraisal procedure, it is characterized in that, described device comprises:
Theoretical health index acquiring unit is in order to obtain the theoretical health index HI of transformer 1, described index HI 1Greater than 0, and described index HI 1It is the theoretical value that the insulation ag(e)ing rule according to transformer oilpaper self calculates;
Test health index acquiring unit is in order to obtain the test health index HI of transformer 2, described index HI 2Greater than 0, and described index HI 2Be to determine according to the test findings to transformer, described test findings comprises body oil chromatography index HIF 1, body oil index HIF 2, body dielectric loss index HIF 3, load factor HIF 4, historical failure index HIF 5, sleeve pipe dielectric loss index HIF 6, polarization index HIF 7, direct current resistance HIF 8, shelf depreciation index HIF 9, on-load voltage regulating switch oil chromatography index HIF 10, and on-load voltage regulating switch oil index HIF 11, and HIF 1To HIF 11All greater than 0;
State estimation index acquiring unit, in order to obtaining state estimation index HI, described index HI is for assessment of the health status of transformer, wherein 0＜
Figure 860105DEST_PATH_IMAGE001
＜1,
Figure 26644DEST_PATH_IMAGE001
Representation theory health index HI 1Scale-up factor, and satisfy:
；
The maintenance strategy call unit in order to foundation gained HI, calls the maintenance strategy of transformer.
To sum up, the invention solves the problem that transformer state is difficult to assess, and corresponding appraisal procedure and device be provided, by theoretical health index and test health index, with as far as possible simply, complete as far as possible form simplified transformer maintenance work of the prior art.
Above embodiment has been described in detail the present invention, and those skilled in the art can make the different embodiments that change to the present invention according to the above description, and some details among the embodiment only is more excellent mode, is not construed as limiting the invention.

Claims (8)

1. oil-filled transformer state evaluating method is characterized in that:
Step (1): the theoretical health index HI that obtains transformer 1, described index HI 1Greater than 0, and described index HI 1It is the theoretical value that the insulation ag(e)ing rule according to transformer oilpaper self calculates;
Step (2): the test health index HI that obtains transformer 2, described index HI 2Greater than 0, and described index HI 2Be to determine according to the test findings to transformer, described test findings comprises body oil chromatography index HIF 1, body oil index HIF 2, body dielectric loss index HIF 3, load factor HIF 4, historical failure index HIF 5, sleeve pipe dielectric loss index HIF 6, polarization index HIF 7, direct current resistance HIF 8, shelf depreciation index HIF 9, on-load voltage regulating switch oil chromatography index HIF 10, and on-load voltage regulating switch oil index HIF 11, and HIF 1To HIF 11All greater than 0;
Step (3): obtain state estimation index HI, described index HI is for assessment of the health status of transformer, wherein 0＜ ＜1, representation theory health index HI 1Scale-up factor, and satisfy:
Figure 157849DEST_PATH_IMAGE002
；
Step (4): take gained HI as foundation, call the maintenance strategy of transformer.
2. state evaluating method as claimed in claim 1 is characterized in that:
Figure 764411DEST_PATH_IMAGE003
?，
In the formula: HI 0The initial health index of indication transformer is generally 0.5; B represents aging coefficient, and is relevant with the expected life of transformer; T 1The aging initial time of expression is generally transformer and puts into operation the time; T 2The time of the correspondence that expression will be calculated.
3. state evaluating method as claimed in claim 1 is characterized in that:
Figure 961037DEST_PATH_IMAGE004
，
In the formula: K iExpression HIF iWeight coefficient,
Figure 886005DEST_PATH_IMAGE005
Expression HIF 1To HIF 9About HI 2Scale-up factor, 0＜
Figure 826279DEST_PATH_IMAGE005
＜1.
4. state evaluating method as claimed in claim 2 is characterized in that: establish HI 1Maximal value be 10, HI 0Be 0.5, then have:
Figure 225031DEST_PATH_IMAGE006
。
5. such as the arbitrary described state evaluating method of claim 2-4, it is characterized in that: establish HI 1, HI 2, HIF 1To HIF 11Maximal value is 10.
6. such as the arbitrary described state evaluating method of claim 2-5, it is characterized in that:
，
Figure 801560DEST_PATH_IMAGE005
＝0.6。
7. such as the arbitrary described state evaluating method of claim 2-5, it is characterized in that:
Figure 279946DEST_PATH_IMAGE001
＝0.4，
Figure 392259DEST_PATH_IMAGE005
＝0.6。
8. be used for implementing the device of claim 1-7 either method, it is characterized in that, described device comprises:
Theoretical health index acquiring unit is in order to obtain the theoretical health index HI of transformer 1, described index HI 1Greater than 0, and described index HI 1It is the theoretical value that the insulation ag(e)ing rule according to transformer oilpaper self calculates;
Test health index acquiring unit is in order to obtain the test health index HI of transformer 2, described index HI 2Greater than 0, and described index HI 2Be to determine according to the test findings to transformer, described test findings comprises body oil chromatography index HIF 1, body oil index HIF 2, body dielectric loss index HIF 3, load factor HIF 4, historical failure index HIF 5, sleeve pipe dielectric loss index HIF 6, polarization index HIF 7, direct current resistance HIF 8, shelf depreciation index HIF 9, on-load voltage regulating switch oil chromatography index HIF 10, and on-load voltage regulating switch oil index HIF 11, and HIF 1To HIF 11All greater than 0;
State estimation index acquiring unit, in order to obtaining state estimation index HI, described index HI is for assessment of the health status of transformer, wherein 0＜ ＜1, representation theory health index HI 1Scale-up factor, and satisfy:
Figure 862871DEST_PATH_IMAGE002
；
The maintenance strategy call unit in order to foundation gained HI, calls the maintenance strategy of transformer.
CN201210325930.5A 2012-09-06 2012-09-06 A kind of oil-filled transformer state evaluating method and device thereof Active CN102867119B (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103267912A (en) * 2013-04-27 2013-08-28 中国南方电网有限责任公司超高压输电公司检修试验中心 Risk assessment system and risk assessment method for direct-current transmission wall bushing
CN104266677A (en) * 2014-09-15 2015-01-07 国家电网公司 Method for evaluating running health state of magnetic control paralleling reactor
CN104914327A (en) * 2015-05-06 2015-09-16 北京航空航天大学 Transformer fault maintenance prediction method based on real-time monitoring information
CN105205590A (en) * 2015-09-01 2015-12-30 深圳供电局有限公司 Method and system for analyzing health state of transformer
CN106199234A (en) * 2016-06-22 2016-12-07 国家电网公司 A kind of transformator residual life detection method based on health index
CN106501641A (en) * 2016-10-20 2017-03-15 云南电网有限责任公司电力科学研究院 A kind of transformer quality state appraisal procedure
CN106841941A (en) * 2017-01-13 2017-06-13 国家电网公司 A kind of oil-filled transformer equipment cancels the condition test method of the customary experiment that has a power failure
CN110286106A (en) * 2019-06-13 2019-09-27 中国石油集团渤海钻探工程有限公司 3-D quantitative fluorescence index for oiliness calculation method
CN117129789A (en) * 2023-10-24 2023-11-28 北京智盟信通科技有限公司 Health state assessment method for power transformer insulation system

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
JAHROMI,A 等: "《An approach to power transformer asset management using health index》", 《ELECTRICAL INSULATION MAGAZINE,IEEE》 *
刘伟: "《电力变压器健康状态评估与剩余寿命分析》", 《万方学位论文全文数据库》 *
覃煜 等: "《基于油气分析的电力变压器状态评估方法》", 《南方电网技术》 *
赵文清 等: "《变压器状态评估综述》", 《变压器》 *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103267912A (en) * 2013-04-27 2013-08-28 中国南方电网有限责任公司超高压输电公司检修试验中心 Risk assessment system and risk assessment method for direct-current transmission wall bushing
CN103267912B (en) * 2013-04-27 2015-12-23 中国南方电网有限责任公司超高压输电公司检修试验中心 A kind of direct current transportation wall bushing risk evaluating system and methods of risk assessment
CN104266677A (en) * 2014-09-15 2015-01-07 国家电网公司 Method for evaluating running health state of magnetic control paralleling reactor
CN104266677B (en) * 2014-09-15 2015-12-30 国家电网公司 Magnetic control shunt reactor runs health state evaluation method
CN104914327A (en) * 2015-05-06 2015-09-16 北京航空航天大学 Transformer fault maintenance prediction method based on real-time monitoring information
CN105205590A (en) * 2015-09-01 2015-12-30 深圳供电局有限公司 Method and system for analyzing health state of transformer
CN106199234A (en) * 2016-06-22 2016-12-07 国家电网公司 A kind of transformator residual life detection method based on health index
CN106501641A (en) * 2016-10-20 2017-03-15 云南电网有限责任公司电力科学研究院 A kind of transformer quality state appraisal procedure
CN106501641B (en) * 2016-10-20 2019-04-30 云南电网有限责任公司电力科学研究院 A kind of transformer quality state appraisal procedure
CN106841941A (en) * 2017-01-13 2017-06-13 国家电网公司 A kind of oil-filled transformer equipment cancels the condition test method of the customary experiment that has a power failure
CN110286106A (en) * 2019-06-13 2019-09-27 中国石油集团渤海钻探工程有限公司 3-D quantitative fluorescence index for oiliness calculation method
CN117129789A (en) * 2023-10-24 2023-11-28 北京智盟信通科技有限公司 Health state assessment method for power transformer insulation system
CN117129789B (en) * 2023-10-24 2024-01-09 北京智盟信通科技有限公司 Health state assessment method for power transformer insulation system

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