CN102253304A - Failure diagnostic method for dynamic stable state of power transformers - Google Patents
Failure diagnostic method for dynamic stable state of power transformers Download PDFInfo
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- CN102253304A CN102253304A CN2011101047285A CN201110104728A CN102253304A CN 102253304 A CN102253304 A CN 102253304A CN 2011101047285 A CN2011101047285 A CN 2011101047285A CN 201110104728 A CN201110104728 A CN 201110104728A CN 102253304 A CN102253304 A CN 102253304A
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Abstract
The invention relates to a failure diagnostic method for the dynamic stable state of power transformers. In the failure diagnostic method, the deformation condition of power transformer windings is analyzed by combining a frequency response process and an impedance process, the power transformers which have the same types and different serial numbers, the same windings with different phases and indexes of the correlation degree of frequency curves of the dynamic stable state are obtained by the frequency response process. The failure diagnostic method comprises the following steps of: analyzing the dynamic stable state of the power transformers according to related coefficients by synthesizing the advantages of the synthesize technology and the impedance process; when exceeding a permissible value, judging the related coefficients by the impedance process; and when numerical values of parameters also exceed the permissible value, determining that the failure of the dynamic stable state of the power transformers occurs.
Description
Technical field
The present invention relates to power transformer detection technique aspect, relate in particular to the moving steady state (SS) method for diagnosing faults of a kind of power transformer.
Background technology
As main equipment important in the electric system, the safe operation of transformer will have a strong impact on the safe operation of electrical network.Along with the fast-developing and construction of electrical network, increasing transformer is moving, and many high-power transformer accidents all cause owing to the step down side short circuit.The anti-short circuit capability of transformer has become the important indicator of weighing transformer, be ensure in the electrical network, the necessary condition of low-pressure system safe operation.At present, the transformer operation time limit nearly decades of moving in the electrical network of Yunnan of a specified duration, these transformer anti-short circuit capabilities are poor, can't stand that because of holding excessive electric power causes device damage easily when suffering sudden short circuit.When transformer suffered sudden short circuit, if short-circuit current is little, relay protection quick acting excision fault was slight to the influence of Transformer Winding; If short-circuit current is big, relay protection is long actuation time, even tripping, and then the influence to Transformer Winding will be serious, even might cause transformer to damage.For slight distortion, if untimely maintenance, behind short-circuit impact repeatedly, cumulative effect also can make transformer damage.Therefore, correctly diagnose the deformation of transformer winding degree, rationally overhauling transformer is important measures that improve the transformer anti-short circuit capability.In addition, along with deepening continuously of electric power network technique supervision work and carrying out of repair based on condition of component work, the operation conditions of on-line monitoring transformer, these all require the moving steady state (SS) of power transformer is made reasonable judgement and fault diagnosis.
In recent years, the frequency response analysis technology is obtaining widespread use aspect the deformation of transformer winding test that suffers short-circuit impact, burst accident and collision, and has obtained good result.But use this method need with original Frequency Response curve to recently judging the deformation extent of Transformer Winding, erroneous judgement or misjudgement also may take place under the situation of no original Frequency Response curve, impedance method is comparatively sensitive to the distortion that influences overall inductance, as radial distortion, axial twist, turn-to-turn open circuit short circuit etc., but the local elongation between the turn-to-turn cake is compressed, the whole displacement of coil, shunting switch contact ablation etc. are insensitive.The frequency response method is all very sensitive to the distortion that influences coil capacitance and inductance, thereby the latter is significantly superior.But the existing strict codes and standards of impedance method is convenient to implement, and is easy to judge.Should be in practice in conjunction with two kinds of methods, make and analyze accurately and judge.
The present invention is exactly a combined impedance method under the situation that does not have original Frequency Response curve, analyzes the winding deformation situation of power transformer, proposes corresponding method for diagnosing faults.
Summary of the invention
Summary of the invention comprises: jointly the distortion situation of Winding in Power Transformer is analyzed in conjunction with frequency response method and impedance method, at first utilize the corresponding method of frequency to obtain the related coefficient of curve, when correlativity is poor, utilize impedance method to analyze winding four parameters (impedance voltage U again
K, short-circuit impedance Z
K, short-circuit reactance X
K, leakage inductance L
K) in any one or all, when the difference of the same winding of the horizontal and similar model of this parameter acquires a certain degree, can judge that this Winding in Power Transformer breaks down.
The present invention is achieved by the following technical solution.
Power transformer moves the steady state (SS) method for diagnosing faults, it is characterized in that, this method for diagnosing faults adopts the combination of frequency response method and impedance method jointly the distortion situation of Winding in Power Transformer to be analyzed, step is: at first utilize the corresponding method of frequency obtain model identical, number different power transformers, out of phase identical winding, the index of moving steady state (SS) frequency curve degree of correlation, be called for short correlation coefficient r, arbitrary computing method of the correlation coefficient r of other phases relatively are:
r?=?[∑X
iY
i?-?m?(∑X
i?/?m)(∑Y
i?/?m)]/?SQRT{[∑X
i 2?-?m?(∑X
i?/?m)
2][∑Y
i 2?-?m?(∑Y
i?/?m)
2]}
Wherein, X
i, Y
iThe difference of representing two corresponding values of curve is X
i=X
IA-X
IB, Y
i=Y
IA-Y
IB, m represents counting of frequency response curve sampling, SQRT represents the computing of extraction of square root;
When correlation coefficient r less than 0.8 the time, utilize impedance method to analyze the impedance voltage U of winding again
K, short-circuit impedance Z
K, short-circuit reactance X
K, leakage inductance L
KIn four parameters any one or all, work as voltage U
K, short-circuit impedance Z
K, short-circuit reactance X
K, leakage inductance L
KIn four parameters any one or all the difference of the same windings of the horizontal and similar model of parameter can judge that above ± 1.8% o'clock this Winding in Power Transformer breaks down.
The present invention when the related coefficient absolute value more than or equal to 0.8 the time, and Frequency Response curve low frequency part tuning-points is not when having skew, can judge that Transformer Winding do not have obviously visible distortion; Transformer Winding has slight deformation when between the related coefficient absolute value 0.6-0.8; When the related coefficient absolute value (comprised and equals 0.6) between 0.5-0.6, Transformer Winding had than gross distortion; When the related coefficient absolute value smaller or equal to 0.5 the time, Transformer Winding has gross distortion; Judge the deformation extent of winding by related coefficient after, the deformation properties that also can the harmonious amplitude of skew by tuning-points further confirm coil: obviously skew has taken place and amplitude changes greatly in low-frequency range in Transformer Winding Frequency Response curve tuning-points, or when skew has all taken place in whole frequency scope interior resonance point, gross distortion has taken place or bulk deformation has taken place in Transformer Winding, should handle transformer as early as possible.
The present invention measures the instrumentation of winding parameter, and the class of accuracy of voltage, electric current, frequency, phase parameter is 0.1 grade.
The present invention contrasts the impedance voltage U of transformer same model winding of the same type
K, short-circuit impedance Z
K, short-circuit reactance X
K, leakage inductance L
KOne of parameter or whole 4 parameters, the value of relative other phases of arbitrary parameter differs and surpasses ± 1.8% in three-phase, judges that promptly this winding produces bigger winding deformation, and moving steady state (SS) is bad.
According to the frequency response technology Winding in Power Transformer is analyzed, obtain the frequency response curve of the different windings of power transformer, under the situation that does not have original Frequency Response curve, the frequency response curve that detects according to the different identical sample model windings of power transformer on the same stage, for example A phase frequency response curve n group (X
IA, Y
IA), B phase frequency response curve n organizes (X
IB, Y
IB), C phase frequency response curve n organizes (X
IC, Y
IC), obtain arbitrary related coefficient of other phases relatively:
1 when the related coefficient absolute value more than or equal to 0.8 the time, and Frequency Response curve low frequency part tuning-points is not when having obvious skew, Transformer Winding does not have obviously visible distortion;
2 when between the related coefficient absolute value 0.6-0.8 Transformer Winding slight deformation is arranged;
3 when the related coefficient absolute value (comprises and equals 0.6) between 0.5-0.6, and Transformer Winding has than gross distortion;
4 when the related coefficient absolute value smaller or equal to 0.5 the time, Transformer Winding has gross distortion; 5 judge the deformation extent of winding by related coefficient after, the deformation properties that also can the harmonious amplitude of skew by tuning-points further confirm coil: obviously skew has taken place and amplitude changes greatly in low-frequency range in Transformer Winding Frequency Response curve tuning-points, or when skew has all taken place in whole frequency scope interior resonance point, gross distortion has taken place or bulk deformation has taken place in Transformer Winding, should handle transformer as early as possible.
The computing method of concrete arbitrary correlation coefficient r of other phases relatively are as follows:
Be r=[∑ X
iY
i-m (∑ X
i/ m) (∑ Y
i/ m)]/SQRT{[∑ X
i 2-m (∑ X
i/ m)
2] [∑ Y
i 2-m (∑ Y
i/ m)
2]
Wherein, X
i, Y
iThe difference of representing two corresponding values of curve is X
i=X
IA-X
IB, Y
i=Y
IA-Y
IB, m represents counting of frequency response curve sampling, SQRT represents the computing of extraction of square root.
When the related coefficient absolute value smaller or equal to 0.6 the time, can utilize impedance method that the moving steady state (SS) of power transformer is judged once more again, if the user feels to be necessary or be worried to related coefficient certainly, also can utilize impedance method that the moving steady state (SS) of power transformer is made comprehensive judgement.
Impedance method is judged the moving steady state (SS) main contents of power transformer:
1, detected parameters
Winding four parameters---impedance voltage U
K, short-circuit impedance Z
K, short-circuit reactance X
K, leakage inductance L
KOne of, general desirable short-circuit impedance Z
K, this is more easy-to-understand, certainly also can 4 all analyzes.
2, mode of connection
On the ultimate principle of test wiring is identical with no-load test.Can be added to the power supply that is nominally 380V on the winding of the right high voltage of tested winding one side at the scene.Only tens amperes of the electric current I that feeds when adding 380V voltage on the Transformer Winding of 35kV and above electric pressure, therefore, detecting the moving steady state parameters of Transformer Winding with the low-voltage method is easy at the scene.
3, test request
The reproducibility that GB GB1094.5 requires reactance (one of four parameters) to test should be in ± 0.2%.If be interpreted as: under different measuring currents, measured value difference each other must not be greater than ± 0.2%.
Measure winding parameter, available commercialization based on the voltammetry principle instrumentation, but all must be to voltage, electric current, frequency, the isoparametric correction of phase place.Adopt the instrument of voltammetry principle can realize having concurrently trichotomy and two kinds of functions of single plane method with comparalive ease, adopt following ten amounts (three voltages, three magnitudes of current, three active power amounts, a frequency quantity) simultaneously, through instrument from normal moveout correction and convert the three-phase integrated value finally make the parameter of surveying simultaneously and the class of accuracy of each single-phase value be 0.1 grade.
4, to the requirement of testing tool
Technical device to the moving steady state (SS) of test power transformer requires as follows:
1) can directly measure the real effective of electric current, voltage.
2) decide voltage method and measure big-and-middle-sized no-load transformer electric current I with low
,The time, the current value great majority tens milliamperes between the hundreds of milliampere, in this range ability, the accuracy of current measurement should not be lower than 0.1 grade.
3) in the process of boosting of test, the instrument computational analysis of sampling automatically when voltage is raised in the agreement section.
5, detected object
That detects is right to liking winding.There is n winding just to have n winding right.What winding parameter reflected is the relation of relative position between every pair of winding.Any one winding has distortion or displacement must cause the variation of the winding parameter that the winding that contains this winding is right.
Winding moves stable detection, can detect the parameter of high pressure winding to other each winding earlier, promptly carry out (n-1) inferior, rather than the n of load test (n-1)/2.Usually feed electric current, the opposite side winding that the tested winding of short circuit is right at high-pressure side winding making alive.The right parameter of finding certain winding has when unusual, and must carry out the right detection of associated winding is that winding has distortion or displacement to examine actually.
Tap gear when 6, detecting
The moving stable detection of winding should be carried out at ceiling voltage tap gear.Not only the pressure side winding should be high tap position (have winding that positive and negative scope transfers also can in the pressurization of minimum voltage tap shelves), and also should be at high tap position by the short circuit winding.Allow right all wire turns of tested winding all in sensing range.
7, comprehensive judgement
Contrast the impedance voltage U of transformer same model winding of the same type
K, short-circuit impedance Z
K, short-circuit reactance X
K, leakage inductance L
KEtc. one of parameter, get short-circuit impedance Z here
K, Z in three-phase
KThe value of other phases differs and surpasses ± 1.8% relatively, can judge that this winding produces bigger winding deformation, and moving steady state (SS) is bad.
Certainly more prudent way is, to surpassing transformer, particularly related coefficient and the Z of demand value
KWhen all exceeding the allowed band value, the complementary detection that should be correlated with is so that can decision continue operation.Complementary detection comprises: the stratographic analysis of gassiness in the oil, interwinding capacity test, winding D.C. resistance test, no-load current and open circuit loss test etc. also should consider to carry out the shelf depreciation test to the transformer of key position.
Embodiment
Power transformer moves the steady state (SS) method for diagnosing faults, it is characterized in that, this method for diagnosing faults adopts the combination of frequency response method and impedance method jointly the distortion situation of Winding in Power Transformer to be analyzed, step is: at first utilize the corresponding method of frequency obtain model identical, number different power transformers, out of phase identical winding, the index of moving steady state (SS) frequency curve degree of correlation, be called for short correlation coefficient r, arbitrary computing method of the correlation coefficient r of other phases relatively are:
r?=?[∑X
iY
i?-?m?(∑X
i?/?m)(∑Y
i?/?m)]/?SQRT{[∑X
i 2?-?m?(∑X
i?/?m)
2][∑Y
i 2?-?m?(∑Y
i?/?m)
2]}
Wherein, X
i, Y
iThe difference of representing two corresponding values of curve is X
i=X
IA-X
IB, Y
i=Y
IA-Y
IB, m represents counting of frequency response curve sampling, SQRT represents the computing of extraction of square root;
When correlation coefficient r less than 0.8 the time, utilize impedance method to analyze the impedance voltage U of winding again
K, short-circuit impedance Z
K, short-circuit reactance X
K, leakage inductance L
KIn four parameters any one or all, work as voltage U
K, short-circuit impedance Z
K, short-circuit reactance X
K, leakage inductance L
KIn four parameters any one or all the difference of the same windings of the horizontal and similar model of parameter can judge that above ± 1.8% o'clock this Winding in Power Transformer breaks down.
The present invention when the related coefficient absolute value more than or equal to 0.8 the time, and Frequency Response curve low frequency part tuning-points is not when having skew, can judge that Transformer Winding do not have obviously visible distortion; Transformer Winding has slight deformation when between the related coefficient absolute value 0.6-0.8; When the related coefficient absolute value (comprised and equals 0.6) between 0.5-0.6, Transformer Winding had than gross distortion; When the related coefficient absolute value smaller or equal to 0.5 the time, Transformer Winding has gross distortion; Judge the deformation extent of winding by related coefficient after, the deformation properties that also can the harmonious amplitude of skew by tuning-points further confirm coil: obviously skew has taken place and amplitude changes greatly in low-frequency range in Transformer Winding Frequency Response curve tuning-points, or when skew has all taken place in whole frequency scope interior resonance point, gross distortion has taken place or bulk deformation has taken place in Transformer Winding, should handle transformer as early as possible.
The present invention measures the instrumentation of winding parameter, and the class of accuracy of voltage, electric current, frequency, phase parameter is 0.1 grade.
The present invention contrasts the impedance voltage U of transformer same model winding of the same type
K, short-circuit impedance Z
K, short-circuit reactance X
K, leakage inductance L
KOne of parameter or whole 4 parameters, the value of relative other phases of arbitrary parameter differs and surpasses ± 1.8% in three-phase, judges that promptly this winding produces bigger winding deformation, and moving steady state (SS) is bad.
Claims (4)
1. power transformer moves the steady state (SS) method for diagnosing faults, it is characterized in that, this method for diagnosing faults adopts the combination of frequency response method and impedance method jointly the distortion situation of Winding in Power Transformer to be analyzed, step is: at first utilize the corresponding method of frequency obtain model identical, number different power transformers, out of phase identical winding, the index of moving steady state (SS) frequency curve degree of correlation, be called for short correlation coefficient r, arbitrary computing method of the correlation coefficient r of other phases relatively are:
r?=?[∑X
iY
i?-?m?(∑X
i?/?m)(∑Y
i?/?m)]/?SQRT{[∑X
i 2?-?m?(∑X
i?/?m)
2][∑Y
i 2?-?m?(∑Y
i?/?m)
2]}
Wherein, X
i, Y
iThe difference of representing two corresponding values of curve is X
i=X
IA-X
IB, Y
i=Y
IA-Y
IB, m represents counting of frequency response curve sampling, SQRT represents the computing of extraction of square root;
When correlation coefficient r less than 0.8 the time, utilize impedance method to analyze the impedance voltage U of winding again
K, short-circuit impedance Z
K, short-circuit reactance X
K, leakage inductance L
KIn four parameters any one or all, work as voltage U
K, short-circuit impedance Z
K, short-circuit reactance X
K, leakage inductance L
KIn four parameters any one or all the difference of the same windings of the horizontal and similar model of parameter can judge that above ± 1.8% o'clock this Winding in Power Transformer breaks down.
2. according to the moving steady state (SS) method for diagnosing faults of a kind of power transformer under the claim 1, it is characterized in that: when the related coefficient absolute value more than or equal to 0.8 the time, and when Frequency Response curve low frequency part tuning-points does not have skew, can judge that Transformer Winding do not have obviously visible distortion; Transformer Winding has slight deformation when between the related coefficient absolute value 0.6-0.8; When the related coefficient absolute value (comprised and equals 0.6) between 0.5-0.6, Transformer Winding had than gross distortion; When the related coefficient absolute value smaller or equal to 0.5 the time, Transformer Winding has gross distortion; Judge the deformation extent of winding by related coefficient after, the deformation properties that also can the harmonious amplitude of skew by tuning-points further confirm coil: obviously skew has taken place and amplitude changes greatly in low-frequency range in Transformer Winding Frequency Response curve tuning-points, or when skew has all taken place in whole frequency scope interior resonance point, gross distortion has taken place or bulk deformation has taken place in Transformer Winding, should handle transformer as early as possible.
3. according to the moving steady state (SS) method for diagnosing faults of a kind of power transformer under the claim 1, it is characterized in that: measure the instrumentation of winding parameter, the class of accuracy of voltage, electric current, frequency, phase parameter is 0.1 grade.
4. according to the moving steady state (SS) method for diagnosing faults of a kind of power transformer under the claim 1, it is characterized in that: the impedance voltage U that contrasts transformer same model winding of the same type
K, short-circuit impedance Z
K, short-circuit reactance X
K, leakage inductance L
KOne of parameter or whole 4 parameters, the value of relative other phases of arbitrary parameter differs and surpasses ± 1.8% in three-phase, judges that promptly this winding produces bigger winding deformation, and moving steady state (SS) is bad.
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| CN102721898A (en) * | 2012-02-27 | 2012-10-10 | 衢州电力局 | On-line measurement method and on-line measurement system for deformation of transformer winding |
| CN102997838A (en) * | 2012-11-20 | 2013-03-27 | 中国电力科学研究院 | Transformer winding deformation fault diagnosis method based on frequency sweep short circuit characteristics |
| CN103217579A (en) * | 2012-12-28 | 2013-07-24 | 富阳市供电局 | On-line monitoring system of transformer winding |
| CN103412228A (en) * | 2013-08-29 | 2013-11-27 | 成都恒锐智科数字技术有限公司 | Method for measuring frequency response of distributed transformer |
| CN103884943A (en) * | 2014-04-02 | 2014-06-25 | 国家电网公司 | Method for comprehensively analyzing and diagnosing deformation of winding of transformer |
| CN104020370A (en) * | 2014-05-22 | 2014-09-03 | 中国南方电网有限责任公司电网技术研究中心 | Transformer internal fault diagnosis method based on virtual parameter change monitoring |
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| WO2016058435A1 (en) * | 2014-10-16 | 2016-04-21 | 江苏省电力公司泰州供电公司 | Winding state evaluation method under external fault of transformer |
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