CN102253304B - 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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- CN102253304B CN102253304B CN 201110104728 CN201110104728A CN102253304B CN 102253304 B CN102253304 B CN 102253304B CN 201110104728 CN201110104728 CN 201110104728 CN 201110104728 A CN201110104728 A CN 201110104728A CN 102253304 B CN102253304 B CN 102253304B
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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 a kind of failure diagnostic method for dynamic stable state of power transformers.
Background technology
As main equipment important in 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 are all because the step down side short circuit causes.The anti-short circuit capability of transformer has become the important indicator of weighing transformer, is the necessary condition that ensures the safe operation of electrical network medium low pressure system.At present, the transformer operation time limit nearly decades of a specified duration of moving in Yunnan Power System, these transformer anti-short circuit capabilities are poor, easily can't stand excessive electric power cause damage of equipment because holding 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 on the impact of Transformer Winding; If short-circuit current is large, relay protection is long actuation time, and even tripping will be serious on the impact of Transformer Winding, even might cause transformer to damage.For slight distortion, if untimely maintenance, after 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 being widely applied aspect the deformation of transformer winding test that suffers short-circuit impact, burst accident and collision, and has obtained good result.But use the method need to judge with original Frequency Response curve comparison the deformation extent of Transformer Winding, in the situation that without original Frequency Response curve, erroneous judgement or misjudgement may occur also, impedance method is comparatively sensitive on the distortion that affects 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 coil global displacement, tapping switch contact ablation etc. are insensitive.Method of frequency response method is all very sensitive on the distortion that affects coil capacitance and inductance, thereby the latter is significantly superior.But impedance method has strict codes and standards, is convenient to implement, and is easy to judgement.Should in conjunction with two kinds of methods, make and analyze accurately and judge in practice.
The present invention is exactly in the situation that there is no original Frequency Response curve combined impedance method, 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 deformation 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, the recycling impedance method is analyzed winding four parameters (impedance voltage U when correlativity is poor
K, short-circuit impedance Z
K, short-circuit reactance X
K, leakage inductance L
K) in any one or all, when difference horizontal when this parameter and the same winding of similar model acquires a certain degree, can judge that this Winding in Power Transformer breaks down.
The present invention is achieved by the following technical solution.
Failure diagnostic method for dynamic stable state of power transformers, it is characterized in that, the combination of this method for diagnosing faults proportion response method and impedance method is analyzed the deformation of Winding in Power Transformer jointly, 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 that represents 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;
Less than 0.8 the time, the recycling impedance method is analyzed the impedance voltage U of winding when correlation coefficient r
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 horizontal and same winding of similar model of parameter over ± 1.8% the time, can judge that this Winding in Power Transformer breaks down.
More than or equal to 0.8 the time, and Frequency Response curve low frequency part tuning-points can judge that Transformer Winding is without obviously visible distortion during without skew when the related coefficient absolute value in the present invention; Transformer Winding has slight deformation when between related coefficient absolute value 0.6-0.8; When (comprising and equaling 0.6) between 0.5-0.6 when the related coefficient absolute value, Transformer Winding has than gross distortion; Less than or equal to 0.5 the time, Transformer Winding has gross distortion when the related coefficient absolute value; 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 occured and amplitude changes greatly in low-frequency range in Transformer Winding Frequency Response curve tuning-points, or when skew has all occured in whole band limits interior resonance point, gross distortion has occured or bulk deformation has occured in Transformer Winding, should process as early as possible transformer.
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 namely this winding produces larger 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, in the situation that there is no original Frequency Response curve, the frequency response curve that identical sample model windings different from power transformer on the same stage detect, 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 during without obvious skew, Transformer Winding is without obviously visible distortion;
2 when between related coefficient absolute value 0.6-0.8 Transformer Winding slight deformation is arranged;
3 when (comprising and equaling 0.6) between 0.5-0.6 when the related coefficient absolute value, and Transformer Winding has than gross distortion;
4 when the related coefficient absolute value less than 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 occured and amplitude changes greatly in low-frequency range in Transformer Winding Frequency Response curve tuning-points, or when skew has all occured in whole band limits interior resonance point, gross distortion has occured or bulk deformation has occured in Transformer Winding, should process as early as possible transformer.
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 that represents 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 less than or equal to 0.6 the time, be that recycling impedance method judges again to the moving steady state (SS) of power transformer, if the user feels to be necessary or be worried to related coefficient certainly, also can utilize impedance method to make comprehensive judgement to the moving steady state (SS) of power transformer.
The moving steady state (SS) main contents of impedance method judgement 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
Identical with no-load test on the ultimate principle of test wiring.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 passes into when adding 380V voltage on the Transformer Winding of 35kV and above, 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 with comparalive ease having concurrently trichotomy and two kinds of functions of single plane method, adopt simultaneously lower ten amounts (three voltages, three magnitudes of current, three active power amounts, a frequency quantity), it is 0.1 grade that the automatic calibration of process instrument and conversion finally make the three-phase comprehensive value of the parameter of surveying simultaneously and the class of accuracy of each single-phase value.
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, between the hundreds of milliampere, in this range ability, the accuracy of current measurement should be lower than 0.1 grade at tens milliamperes for the current value great majority.
3) in the process of boosting of test, the instrument computational analysis of automatically sampling when voltage is raised in the agreement section.
5, detected object
Detect to as if winding pair.There is n winding that n winding pair just arranged.What winding parameter reflected is the relation of every pair of winding relative position.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 first detect the high pressure winding to the parameter of other each winding, namely carry out (n-1) inferior, rather than the n of load test (n-1)/2.Usually pass into electric current at high-pressure side winding making alive, the opposite side winding that the tested winding of short circuit is right.The right parameter of finding certain winding has when abnormal, and must carry out the right detection of associated winding is that winding has distortion or displacement to examine actually.
Tapping gear when 6, detecting
The moving stable detection of winding should be carried out at the ceiling voltage tapping 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 larger 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, can the complementary detection that should be correlated with continue operation in order to determine.Complementary detection comprises: the stratographic analysis of gassiness in 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
Failure diagnostic method for dynamic stable state of power transformers, it is characterized in that, the combination of this method for diagnosing faults proportion response method and impedance method is analyzed the deformation of Winding in Power Transformer jointly, 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 that represents 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;
Less than 0.8 the time, the recycling impedance method is analyzed the impedance voltage U of winding when correlation coefficient r
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 horizontal and same winding of similar model of parameter over ± 1.8% the time, can judge that this Winding in Power Transformer breaks down.
More than or equal to 0.8 the time, and Frequency Response curve low frequency part tuning-points can judge that Transformer Winding is without obviously visible distortion during without skew when the related coefficient absolute value in the present invention; Transformer Winding has slight deformation when between related coefficient absolute value 0.6-0.8; When (comprising and equaling 0.6) between 0.5-0.6 when the related coefficient absolute value, Transformer Winding has than gross distortion; Less than or equal to 0.5 the time, Transformer Winding has gross distortion when the related coefficient absolute value; 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 occured and amplitude changes greatly in low-frequency range in Transformer Winding Frequency Response curve tuning-points, or when skew has all occured in whole band limits interior resonance point, gross distortion has occured or bulk deformation has occured in Transformer Winding, should process as early as possible transformer.
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 namely this winding produces larger winding deformation, and moving steady state (SS) is bad.
Claims (3)
1. failure diagnostic method for dynamic stable state of power transformers, it is characterized in that, the combination of this method for diagnosing faults proportion response method and impedance method is analyzed the deformation of Winding in Power Transformer jointly, 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
iRepresent the difference of two corresponding values of curve, i.e. X
i=X
iA-X
iB, Y
i=Y
iA-Y
iB, X
iA, Y
iAI frequency response curve in expression A phase n group, X
iB, Y
iBI frequency response curve in expression B phase n group, m represents counting of frequency response curve sampling, SQRT represents the computing of extraction of square root;
Less than 0.8 the time, the recycling impedance method is analyzed the impedance voltage U of winding when correlation coefficient r
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 horizontal and same winding of similar model of parameter over ± 1.8% the time, can judge that this Winding in Power Transformer breaks down, when the related coefficient absolute value more than or equal to 0.8 the time, and Frequency Response curve low frequency part tuning-points can judge that without when skew Transformer Winding is without obviously visible distortion; Transformer Winding has slight deformation when between related coefficient absolute value 0.6-0.8; When the related coefficient absolute value was between 0.5-0.6, Transformer Winding had than gross distortion; Less than or equal to 0.5 the time, Transformer Winding has gross distortion when the related coefficient absolute value; 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 occured and amplitude changes greatly in low-frequency range in Transformer Winding Frequency Response curve tuning-points, or when skew has all occured in whole band limits interior resonance point, gross distortion has occured or bulk deformation has occured in Transformer Winding, should process as early as possible transformer.
2. a kind of failure diagnostic method for dynamic stable state of power transformers under according to 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.
3. a kind of failure diagnostic method for dynamic stable state of power transformers under according to claim 1, 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 namely this winding produces larger winding deformation, and moving steady state (SS) is bad.
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| CN 201110104728 CN102253304B (en) | 2011-04-26 | 2011-04-26 | Failure diagnostic method for dynamic stable state of power transformers |
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| CN102253304B true CN102253304B (en) | 2013-05-22 |
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| CN1811474A (en) * | 2004-07-25 | 2006-08-02 | 天水长城电力仪器设备厂 | Transformer dynamic stability state parameter tester and diagnostic software |
| CN101701995B (en) * | 2009-11-12 | 2011-11-16 | 重庆大学 | Impulse response analytical test apparatus and method for detecting deformation of transformer winding |
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