CN105823960A - Method and system for comprehensively diagnosing deformation of transformer winding - Google Patents
Method and system for comprehensively diagnosing deformation of transformer winding Download PDFInfo
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- CN105823960A CN105823960A CN201610158173.5A CN201610158173A CN105823960A CN 105823960 A CN105823960 A CN 105823960A CN 201610158173 A CN201610158173 A CN 201610158173A CN 105823960 A CN105823960 A CN 105823960A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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Abstract
The invention discloses a method and a system for comprehensively diagnosing deformation of a transformer winding. The method comprises steps: firstly, the winding capacitance, the frequency response, the short circuit impedance, the short circuit current and the accumulated short circuit time data of the transformer are acquired, deformation indexes are provided, and the acquired data are used for calculating the deformation indexes; according to the relation between the deformation indexes and winding deformation grades, each deformation index corresponding to each winding deformation grade is determined; and according to an expert system and a knowledge base, the current transformer deformation condition is determined accurately. Through a large amount of experimental analysis, the method selects several deformation indexes closely related to the winding deformation from a plurality of indexes, the corresponding relation between the deformation indexes and the winding deformation grades is built, and the judgment accuracy is ensured while the calculation work is simplified; and the whole structure of the system is simple, the operation is convenient, and whether deformation happens to the transformer winding and the deformation degree are comprehensively diagnosed automatically according to current test data and the operation condition.
Description
Technical field
The invention belongs to electric power project engineering field, particularly relate to a kind of deformation of transformer winding error comprehensive diagnosis method and system.
Background technology
Transformator is the nucleus equipment of network system, is also one of the most expensive equipment, and its running status directly affects the safety and stablization of whole network system.Owing to manufacturing and designing, process materials, the reason of the aspect such as operation maintenance and running environment, deformation of transformer winding fault is happened occasionally, particularly under the influence of short circuit current, Transformer Winding is by powerful electrodynamic action, it may occur that subside, the mechanicalness permanent deformation such as overall distortion and displacement.Find in time and repair deformation of transformer winding fault, it is possible to extending transformator service life, thus reduce power system unnecessary expenditures.At present, the method for detection winding deformation of power transformer mainly has: (1) judges winding deformation degree according to the variable quantity of winding capacitance；(2) short circuit impedance method；(3) frequency response analysis.Above-mentioned three kinds of methods reflect deformation of transformer winding situation the most to a certain extent, but need abundant field experience winding deformation condition could be carried out preliminary judgement, and do not consider transformator operating condition (short circuit current and accumulative short circuit duration), it is difficult to comprehensive Accurate Diagnosis deformation of transformer winding degree and fault type.
Summary of the invention
The invention provides a kind of deformation of transformer winding error comprehensive diagnosis method and system, it is intended that performance indications each to Transformer Winding carry out integrated treatment, build expert knowledge library, comprehensive Accurate Diagnosis deformation of transformer winding degree.
A kind of deformation of transformer winding error comprehensive diagnosis method, comprises the following steps:
Step 1: obtain transformator service data in real time；
Described transformator service data includes Transformer Winding capacity, frequency response, short-circuit impedance, short circuit current and accumulative short circuit duration；
Step 2: the transformator service data that step 1 the obtained primary data corresponding with transformator calculates each corresponding deformation index according to below equation, and according to correspondence winding deformation hierarchical relationship table, obtains the distortion level that each deformation index is corresponding；
Described deformation index includes winding rate of change of capacitance, frequency response correlation coefficient, short-circuit impedance rate of change and short circuit current and short circuit duration；
Described winding rate of change of capacitance is Δ C%,
Wherein, CCurrentlyAnd COriginalThe real-time capacitance that indication transformer winding is current respectively and initial capacitance when dispatching from the factory；
Table 1 winding rate of change of capacitance and deformation of transformer winding grade corresponding relation
| Rate of change of capacitance | Δ C%≤± 2% | ± 2% ＜ Δ C% ＜ ± 5% | Δ C% >=± 5% |
| Winding deformation grade | I | II | III |
Described frequency response correlation coefficient is R, and the transformator real-time frequency response curve utilizing frequency response tester to record calculates the correlation coefficient of acquisition successively in low-frequency range, Mid Frequency and high band with frequency response curve when dispatching from the factory, and is followed successively by RLF、RMFAnd RHF；The frequency range of described low-frequency range, Mid Frequency and high band is followed successively by (1kHz～100kHz), (100kHz～600kHz), (600KHz～1000kHz)；
Obtaining frequency response curve in real time, point three frequency ranges calculate correlation coefficient, obtain the correlation coefficient of three frequency ranges, and the calculating of described correlation coefficient is to calculate according to the Calculation of correlation factor formula in mathematical principle；
Table 2 frequency response correlation coefficient and deformation of transformer winding grade corresponding relation
| Winding deformation grade | Coefficient R |
| I | RLF>=2.0 and RMF>=1.0 and RHF≥0.6 |
| II | 2.0>RLF>=1.0 or 0.6≤RMF<1.0 |
| III | 1.0>RLF>=0.6 or RMF<0.6 |
| IV | RLF<0.6 |
Described short-circuit impedance rate of change includes horizontal short-circuit impedance rate of change Δ ZLaterally% and longitudinal short-circuit impedance rate of change Δ ZLongitudinally%:
Wherein, ZA、ZB、ZCIt is respectively the short-circuit impedance value of transformator A, B, C three-phase measured in real time；ZCurrentlyThe meansigma methods of the short-circuit impedance value measuring A, B, C three-phase obtained in real time when referring to current test, ZOriginalPoint out the meansigma methods of the short-circuit impedance value of A, B, C three-phase during factory；
More than table 3100MVA or 220kV and above transformator, short-circuit impedance rate of change and deformation of transformer winding grade corresponding relation
| Winding deformation grade | Short-circuit impedance rate of change |
| I | ΔZLongitudinally%≤± 1.6% or Δ ZLaterally%≤2% |
| II | ± 1.6% ＜ Δ ZLongitudinally% ＜ ± 3% or 2% ＜ Δ ZLaterally% ＜ 4% |
| III | ΔZLongitudinally% >=± 3% or Δ ZLaterally% >=4% |
Below table 4100MVA and 220kV and following transformator, short-circuit impedance rate of change and deformation of transformer winding grade corresponding relation
| Winding deformation grade | Short-circuit impedance rate of change |
| I | ΔZLongitudinally%≤± 2% or Δ ZLaterally%≤2.5% |
| II | ± 2% ＜ Δ ZLongitudinally% ＜ ± 4% or 2.5% ＜ Δ ZLaterally% ＜ 5% |
| III | ΔZLongitudinally% >=± 4% or Δ ZLaterally% >=5% |
Short circuit current when described short circuit current and short circuit duration are short-circuited in referring to 2 kilometers of transformator of distance accounts for the percentage ratio I% and accumulative short circuit duration t of transformator permissible short circuit current；
Table 5 short circuit current accounting and accumulative short circuit duration and deformation of transformer winding grade corresponding relation
Step 4: according to the distortion level that each deformation index is corresponding, according to specialist system and knowledge base, determine deformation of transformer winding situation；
Table 6 specialist system and knowledge base
A kind of deformation of transformer winding integrated diagnostic system, use above-mentioned a kind of deformation of transformer winding error comprehensive diagnosis method, including Transformer Winding capacitance collecting unit, frequency response measurement unit, short-circuit impedance collecting unit, short circuit current measurement and accumulation short circuit duration measuring unit, data processing unit and expert rule control library unit；
Described Transformer Winding capacitance collecting unit, frequency response measurement unit, short-circuit impedance collecting unit and short circuit current measurement are all connected with described data processing unit with accumulation short circuit duration measuring unit, and described data processing unit is connected with described expert rule control library unit；
The data processing unit signal data to gathering or measure calculates each deformation index, the result of calculation obtained is exported, according to winding deformation grade corresponding relation, the winding deformation grade that each deformation index is corresponding, described expert rule control library unit is according to each deformed finger target winding deformation grade of input, the winding deformation situation of output current transformer.
Beneficial effect
The invention provides a kind of deformation of transformer winding error comprehensive diagnosis method and system, first the method obtains the winding capacitance of transformator, frequency response, short-circuit impedance, short circuit current and accumulative short circuit duration data, propose deformation index, utilize the data obtained to calculate deformation index；According to deformation index and the relation of winding deformation grade, determine each deformation index correspondence winding deformation grade；According to specialist system and knowledge base, determine the deformation condition of current transformer accurately；The method, by substantial amounts of analysis of experiments, have chosen the several deformation indexs being closely related with winding deformation in the middle of multi objective of comforming, construct the corresponding relation between deformation index and winding deformation grade, ensure that the accuracy of judgement while simplifying evaluation work；This system total is simple and convenient to operate, it is possible to whether there occurs deformation and deformation extent automatically according to current experimental data and operating condition comprehensive diagnos Transformer Winding.Native system can Accurate Diagnosis deformation of transformer winding situation, its service work of accurate instruction；Can prevent from and reduce transformer fault to expand further and development, the generation of prevention power grid accident；Be conducive to extending transformator service life, reduce power system unnecessary expenditures.
Accompanying drawing explanation
Fig. 1 is the structural representation of system of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described further.
A kind of deformation of transformer winding error comprehensive diagnosis method, comprises the following steps:
Step 1: obtain transformator service data in real time；
Described transformator service data includes Transformer Winding capacity, frequency response, short-circuit impedance, short circuit current and accumulative short circuit duration；
Step 2: the transformator service data that step 1 the obtained primary data corresponding with transformator calculates each corresponding deformation index according to below equation, and according to correspondence winding deformation hierarchical relationship table, obtains the distortion level that each deformation index is corresponding；
Described deformation index includes winding rate of change of capacitance, frequency response correlation coefficient, short-circuit impedance rate of change and short circuit current and short circuit duration；
Described winding rate of change of capacitance is Δ C%,
Wherein, CCurrentlyAnd COriginalThe real-time capacitance that indication transformer winding is current respectively and initial capacitance when dispatching from the factory；
Table 1 winding rate of change of capacitance and deformation of transformer winding grade corresponding relation
| Rate of change of capacitance | Δ C%≤± 2% | ± 2% ＜ Δ C% ＜ ± 5% | Δ C% >=± 5% |
| Winding deformation grade | I | II | III |
Described frequency response correlation coefficient is R, and the transformator real-time frequency response curve utilizing frequency response tester to record calculates the correlation coefficient of acquisition successively in low-frequency range, Mid Frequency and high band with frequency response curve when dispatching from the factory, and is followed successively by RLF、RMFAnd RHF；The frequency range of described low-frequency range, Mid Frequency and high band is followed successively by (1kHz～100kHz), (100kHz～600kHz), (600KHz～1000kHz)；
Table 2 frequency response correlation coefficient and deformation of transformer winding grade corresponding relation
| Winding deformation grade | Coefficient R |
| I | RLF>=2.0 and RMF>=1.0 and RHF≥0.6 |
| II | 2.0>RLF>=1.0 or 0.6≤RMF<1.0 |
| III | 1.0>RLF>=0.6 or RMF<0.6 |
| IV | RLF<0.6 |
Described short-circuit impedance rate of change includes horizontal short-circuit impedance rate of change Δ ZLaterally% and longitudinal short-circuit impedance rate of change Δ ZLongitudinally%:
Wherein, ZA、ZB、ZCIt is respectively the short-circuit impedance value of transformator A, B, C three-phase measured in real time；ZCurrentlyThe meansigma methods of the short-circuit impedance value measuring A, B, C three-phase obtained in real time when referring to current test, ZOriginalPoint out the meansigma methods of the short-circuit impedance value of A, B, C three-phase during factory；More than table 3100MVA or 220kV and above transformator, short-circuit impedance rate of change and transformator
Winding deformation grade corresponding relation
| Winding deformation grade | Short-circuit impedance rate of change |
| I | ΔZLongitudinally%≤± 1.6% or Δ ZLaterally%≤2% |
| II | ± 1.6% ＜ Δ ZLongitudinally% ＜ ± 3% or 2% ＜ Δ ZLaterally% ＜ 4% |
| III | ΔZLongitudinally% >=± 3% or Δ ZLaterally% >=4% |
Below table 4100MVA and 220kV and following transformator, short-circuit impedance rate of change and deformation of transformer winding grade corresponding relation
Short circuit current when described short circuit current and short circuit duration are short-circuited in referring to 2 kilometers of transformator of distance accounts for the percentage ratio I% and accumulative short circuit duration t of transformator permissible short circuit current；
Table 5 short circuit current accounting and accumulative short circuit duration and deformation of transformer winding grade corresponding relation
Step 4: according to the distortion level that each deformation index is corresponding, according to specialist system and knowledge base, determine deformation of transformer winding situation；
Table 6 specialist system and knowledge base
, there is near region short circuit secondary in 1 220kV transformator of certain transformer station, short circuit current I% is respectively 67% and 73%, and short circuit duration is respectively 0.34S and 0.46S, is II according to this invention described method grade classification；Rate of change of capacitance 0.91%, grade classification is I；Frequency response data RLFIt is 1.12, RMFIt is 1.26, RHFBeing 0.76, grade classification is II；Short-circuit impedance Δ ZLongitudinally% is 2.1%, Δ ZLaterally% is 3.2, and grade classification is II.There is short circuit between turn-to-turn or cake according to this transformator of system diagnostics of the present invention, hang cover through scene and find that the top position of high pressure B phase winding exists Inter-turn Short Circuit Phenomenon.
Understanding from the above, the method for the invention, application is simple, it is judged that accurate and effective.
As shown in Figure 1, a kind of deformation of transformer winding integrated diagnostic system, use above-mentioned a kind of deformation of transformer winding error comprehensive diagnosis method, including Transformer Winding capacitance collecting unit, frequency response measurement unit, short-circuit impedance collecting unit, short circuit current measurement and accumulation short circuit duration measuring unit, data processing unit and expert rule control library unit；
Described Transformer Winding capacitance collecting unit, frequency response measurement unit, short-circuit impedance collecting unit and short circuit current measurement are all connected with described data processing unit with accumulation short circuit duration measuring unit, and described data processing unit is connected with described expert rule control library unit；
The data processing unit signal data to gathering or measure calculates each deformation index, the result of calculation obtained is exported, according to winding deformation grade corresponding relation, the winding deformation grade that each deformation index is corresponding, described expert rule control library unit is according to each deformed finger target winding deformation grade of input, the winding deformation situation of output current transformer.
Claims (2)
1. a deformation of transformer winding error comprehensive diagnosis method, it is characterised in that comprise the following steps:
Step 1: obtain transformator service data in real time；
Described transformator service data includes Transformer Winding capacity, frequency response, short-circuit impedance, short circuit current and accumulative short circuit duration；
Step 2: the transformator service data that step 1 the obtained primary data corresponding with transformator calculates each corresponding deformation index according to below equation, and according to correspondence winding deformation hierarchical relationship table, obtains the distortion level that each deformation index is corresponding；
Described deformation index includes winding rate of change of capacitance, frequency response correlation coefficient, short-circuit impedance rate of change and short circuit current and short circuit duration；
Described winding rate of change of capacitance is Δ C%,
Wherein, CCurrentlyAnd COriginalThe real-time capacitance that indication transformer winding is current respectively and initial capacitance when dispatching from the factory；
Table 1 winding rate of change of capacitance and deformation of transformer winding grade corresponding relation Rate of change of capacitance ΔC%≤±2% ± 2% ＜ Δ C% ＜ ± 5% ΔC%≥±5%
Winding deformation grade I II III
Described frequency response correlation coefficient is R, and the transformator real-time frequency response curve utilizing frequency response tester to record calculates the correlation coefficient of acquisition successively in low-frequency range, Mid Frequency and high band with frequency response curve when dispatching from the factory, and is followed successively by RLF、RMFAnd RHF；The frequency range of described low-frequency range, Mid Frequency and high band is followed successively by (1kHz～100kHz), (100kHz～600kHz), (600KHz～1000kHz)；
Table 2 frequency response correlation coefficient and deformation of transformer winding grade corresponding relation Winding deformation grade Coefficient R
I RLF>=2.0 and RMF>=1.0 and RHF≥0.6
II 2.0>RLF>=1.0 or 0.6≤RMF<1.0
III 1.0>RLF>=0.6 or RMF<0.6
IV RLF<0.6
Described short-circuit impedance rate of change includes horizontal short-circuit impedance rate of change Δ ZLaterally% and longitudinal short-circuit impedance rate of change Δ ZLongitudinally%:
Wherein, ZA、ZB、ZCIt is respectively the short-circuit impedance value of transformator A, B, C three-phase measured in real time；ZCurrentlyThe meansigma methods of the short-circuit impedance value measuring A, B, C three-phase obtained in real time when referring to current test, ZOriginalPoint out the meansigma methods of the short-circuit impedance value of A, B, C three-phase during factory；
More than table 3100MVA or 220kV and above transformator, short-circuit impedance rate of change and deformation of transformer winding grade corresponding relation Winding deformation grade Short-circuit impedance rate of change
I ΔZLongitudinally%≤± 1.6% or Δ ZLaterally%≤2%
II ± 1.6% ＜ Δ ZLongitudinally% ＜ ± 3% or 2% ＜ Δ ZLaterally% ＜ 4%
III ΔZLongitudinally% >=± 3% or Δ ZLaterally%≥4%
Below table 4100MVA and 220kV and following transformator, short-circuit impedance rate of change and deformation of transformer winding grade corresponding relation Winding deformation grade Short-circuit impedance rate of change
I ΔZLongitudinally%≤± 2% or Δ ZLaterally%≤2.5%
II ± 2% ＜ Δ ZLongitudinally% ＜ ± 4% or 2.5% ＜ Δ ZLaterally% ＜ 5%
III ΔZLongitudinally% >=± 4% or Δ ZLaterally%≥5%
Short circuit current when described short circuit current and short circuit duration are short-circuited in referring to 2 kilometers of transformator of distance accounts for the percentage ratio I% and accumulative short circuit duration t of transformator permissible short circuit current；
Table 5 short circuit current accounting and accumulative short circuit duration and deformation of transformer winding grade corresponding relation
Step 4: according to the distortion level that each deformation index is corresponding, according to specialist system and knowledge base, determine deformation of transformer winding situation；
Table 6 specialist system and knowledge base
2. a deformation of transformer winding integrated diagnostic system, it is characterized in that, use a kind of deformation of transformer winding error comprehensive diagnosis method described in claim 1, including Transformer Winding capacitance collecting unit, frequency response measurement unit, short-circuit impedance collecting unit, short circuit current measurement and accumulation short circuit duration measuring unit, data processing unit and expert rule control library unit；
Described Transformer Winding capacitance collecting unit, frequency response measurement unit, short-circuit impedance collecting unit and short circuit current measurement are all connected with described data processing unit with accumulation short circuit duration measuring unit, and described data processing unit is connected with described expert rule control library unit；
The data processing unit signal data to gathering or measure carries out data calculating according to the method for computing data in power 1, the result of calculation obtained is exported, according to winding deformation grade corresponding relation, the winding deformation grade that each deformation index is corresponding, described expert rule control library unit is according to each deformed finger target winding deformation grade of input, the winding deformation situation of output current transformer.
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| CN106501608A (en) * | 2016-10-14 | 2017-03-15 | 国网福建省电力有限公司 | Error compensation and harmonic elimination device during a kind of reactance measurement |
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| CN106501608B (en) * | 2016-10-14 | 2019-02-22 | 国网福建省电力有限公司 | Error compensation and harmonic elimination device during a kind of reactance measurement |
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| CN108646132A (en) * | 2018-03-26 | 2018-10-12 | 国网湖南省电力有限公司 | A kind of winding deformation diagnostic method based on transformer winding frequency response data Characteristic Extraction |
| CN108646132B (en) * | 2018-03-26 | 2020-05-05 | 国网湖南省电力有限公司 | Winding deformation diagnosis method based on transformer winding frequency response data characteristic quantity extraction |
| CN108693432A (en) * | 2018-04-27 | 2018-10-23 | 国家电网公司 | A kind of tester of deformation of transformer winding |
| CN110176768A (en) * | 2018-07-17 | 2019-08-27 | 吴怀诚 | A kind of electric power data analysis method |
| CN110081809A (en) * | 2019-05-17 | 2019-08-02 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | A kind of method of determining transformer winding width to deformation |
| CN110030920A (en) * | 2019-05-17 | 2019-07-19 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | A kind of test method of deformation of transformer winding, device and storage medium |
| CN110030919A (en) * | 2019-05-17 | 2019-07-19 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | A kind of method of determining transformer winding width to deformation |
| CN110030919B (en) * | 2019-05-17 | 2021-01-05 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Method for determining radial deformation of transformer winding |
| CN111610464A (en) * | 2020-06-02 | 2020-09-01 | 西安热工研究院有限公司 | Method for diagnosing transformer strand breakage by using low-frequency characteristics and direct resistance of frequency response method |
| CN116626417A (en) * | 2023-05-17 | 2023-08-22 | 三科调压电源(深圳)有限公司 | System and method for testing short-circuit resistance of voltage-regulating rectifier transformer |
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