CN104374312B - Method for detecting deformation of power transformer winding - Google Patents
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Abstract
The invention discloses a method for detecting the deformation of a power transformer winding, which comprises the following steps: and acquiring the relative change rate of short-circuit impedance, the overall correlation coefficient of an amplitude-frequency curve, the amplitude-frequency curves of low, medium and high frequency bands, the local correlation coefficient of the amplitude-frequency curves of each frequency band, voltage ratio deviation and the relative change rate of capacitance. Obtaining a winding subjected to deformation and a phase difference result according to the relative change rate of the short-circuit impedance and the integral correlation coefficient of the amplitude-frequency curve; obtaining a short circuit detection result between turns or between cakes according to the correlation coefficient of the low-frequency amplitude-frequency curve and the voltage ratio deviation; obtaining a local deformation result according to the correlation coefficient of the intermediate frequency range amplitude-frequency curve and the relative change rate of the capacitance between windings; obtaining the detection result of the whole displacement of the winding coil or the displacement deformation of the lead according to the correlation coefficient of the high-frequency-band amplitude-frequency curve and the relative change rate of the ground capacitance of the winding; and carrying out logic processing on the results to obtain a comprehensive detection result. The invention greatly improves the reliability of the detection result of the deformation of the power transformer winding.
Description
Technical Field
The invention belongs to the technical field of transformers, and particularly relates to an analysis method for deformation of a power transformer winding.
Background
With the increasing installed capacity of power systems, the short-circuit capacity and the short-circuit current in the systems are increased, and various short-circuit accidents at a short-distance outlet of a power transformer running in the systems are inevitable. When the power transformer is subjected to short circuit impact, the insulation and the mechanical performance of the winding are damaged to different degrees by strong power generated by short circuit current in the winding, and the transformer can be damaged when the insulation and the mechanical performance of the winding are seriously damaged. Short circuit at the close-distance outlet of the transformer can cause winding deformation, insulation damage and winding burnout. The short-circuit accident generally causes the transformer to drop out of operation, and causes great loss to the power grid. In recent years, the occurrence of short-circuit faults at the near zone or the outlet of a transformer seriously influences the safe and stable operation of a power system.
At present, the relatively mature methods for detecting the winding deformation at home and abroad include a frequency response analysis method, a short-circuit impedance method, a winding capacitance method and the like. The frequency response analysis method is widely applied to transformer operation and production departments at home and abroad at present, and achieves the effect. The frequency response method has high sensitivity for judging the deformation of the winding, and can reflect the deformation with little influence on the whole inductance. However, the test result is often influenced by various interference factors, and the requirement on environmental factors is high when the test device is used on site. At present, no clear criterion is formed, misjudgment is easily caused, and the method needs to be matched with conventional electrical experiments or hanging cover inspection.
The single winding capacitance method is characterized by convenient operation, but the sensitivity of the winding capacitance method is not high, the partial slight deformation of the winding cannot be effectively reflected, the judgment can be more accurate only when the winding is seriously deformed, the misjudgment rate is higher and can reach more than 60% in some cases by singly adopting the winding capacitance method, and the test result can only provide reference suggestions.
The single short-circuit impedance method is characterized in that the experimental result mainly reflects the communication of the windings and the inter-turn cake short circuit condition, but the deformation condition of the windings cannot be directly determined, and the deformation condition of the windings can be more accurately determined only by matching with other methods, so that the single short-circuit impedance method is used for judging the deformation of the windings, has low accuracy, is less used in field tests and has great limitation.
The voltage ratio test is used as a new auxiliary method for testing the deformation of the transformer winding, and the method is used in some domestic areas, is simple and quick, and has low sensitivity. The accuracy of judging the deformation of the winding by singly adopting a voltage ratio test is poor, and the success rate of judging is only about 30-45%. Therefore, the voltage ratio test method is singly adopted to judge the winding deformation and is not popularized in a large area.
At present, a single test method is mostly adopted in China as a judgment basis for winding deformation, the test process is greatly influenced by objective factors, the sensitivity is low, the misjudgment rate is high, and the specific situation of winding deformation cannot be effectively reflected.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a detection method for the deformation of a power transformer winding, which solves the problem of lower accuracy of the existing detection method and improves the accuracy of analysis and diagnosis of the deformation of the transformer winding.
In order to achieve the above object, the present invention provides a method for detecting winding deformation of a power transformer, which integrates electrical detection methods such as a short-circuit impedance method, a frequency response method, a voltage ratio test method, a winding capacitance method, etc. on the basis of the prior art, and divides the winding deformation into two parts of a deformation position and a deformation type for analysis, and specifically comprises the following steps:
step 1: acquiring the short-circuit impedance of the winding by adopting a low-voltage short-circuit impedance method, and acquiring the relative change rate of the short-circuit impedance according to the short-circuit impedance; acquiring an integral correlation coefficient of a winding amplitude-frequency response curve by adopting a frequency response method; obtaining the peak and trough changes of the amplitude-frequency response curve of the low, medium and high frequency winding sections by adopting a frequency response method, and obtaining the local correlation coefficients of the amplitude-frequency response curve of the low, medium and high frequency winding sections according to the peak and trough changes of the amplitude-frequency response curve; obtaining a winding resistance transformation ratio by adopting a voltage ratio test method, and obtaining voltage ratio deviation; respectively acquiring capacitance values between windings and the ground by adopting a winding capacitance method, comparing initial values, and respectively acquiring relative change rates;
step 2: obtaining a winding deformation degree detection result according to the relative change rate of the short-circuit impedance and the integral correlation coefficient of the amplitude-frequency response curve;
and step 3: obtaining a short circuit detection result between turns or between cakes according to the correlation coefficient of the low-frequency amplitude-frequency curve and the voltage ratio deviation;
and 4, step 4: obtaining a detection result of winding distortion or local bulge deformation according to the correlation coefficient of the intermediate frequency range amplitude-frequency curve and the relative change rate of capacitance between windings;
and 5: obtaining the detection result of the integral displacement of the winding coil or the displacement of the lead according to the correlation coefficient of the high-frequency-band amplitude-frequency curve and the relative change rate of the ground capacitance of the winding;
step 6: and carrying out logic or operation on the winding deformation degree detection result, the turn-to-turn or cake-to-cake short circuit detection result, the local deformation detection result and the winding coil integral displacement or lead displacement deformation detection result to obtain a transformer winding deformation comprehensive detection result, and indicating the deformation occurrence part, the type of deformation and the deformation degree.
The low-voltage short-circuit impedance method is as follows: the method comprises the steps of carrying out low-voltage short-circuit impedance test on the power transformer, and comparing a test result with a nameplate value or a factory value to judge whether serious fault short-circuit current or a winding is displaced or not due to transportation and installation.
The frequency response method is: the amplitude-frequency response characteristics of each winding of the transformer are detected, the detection results are longitudinally or transversely compared, and the winding deformation possibly occurring in the transformer is judged according to the difference of the amplitude-frequency response characteristics.
The voltage ratio test method refers to: the voltage between windings of the transformer is tested and compared with a factory value to judge whether the windings of the transformer generate interphase or turn-to-turn short circuit so as to cause the deformation of the windings.
The winding capacitance method is: and measuring the capacitance between the windings of the transformer and the capacitance of the windings to the ground, and comparing the measured capacitance with the nameplate value to judge whether the windings of the transformer have deformation such as displacement.
Further, the specific steps of obtaining the short-circuit impedance change rate in step 1 are as follows:
measuring short-circuit impedance Z between high-voltage winding and medium-voltage windingH-MShort-circuit impedance Z between high-voltage winding and low-voltage windingH-LShort-circuit impedance Z between medium-voltage winding and low-voltage windingM-L(ii) a According to the formulaObtaining the relative change rate A of the short-circuit impedance0(ii) a Wherein Z is0Representing an initial value of the short-circuit impedance; z1Is ZH-MOr ZH-LOr ZM-L。
Further, the overall correlation coefficient obtaining process in step 1 is as follows: according to the transverse comparison method of standard DLT911-2004 'frequency response analysis method for winding deformation of power transformer', the amplitude-frequency response curves of low-voltage, medium-voltage and high-voltage windings are measured, then the correlation coefficients of different curves of the same winding are respectively calculated, and B is used1And (4) showing.
Further, the low, medium, high, low,The local correlation coefficient of the high-frequency band amplitude-frequency curve is measured according to a transverse comparison method of a standard DLT911-2004 'frequency response analysis method for winding deformation of a power transformer', amplitude-frequency response curves of low-voltage, medium-voltage and high-voltage windings are obtained, the change information of wave crest and wave trough positions of the amplitude-frequency response curves is obtained, the local correlation coefficient of the high-frequency band amplitude-frequency curve belongs to a low frequency band according to 1 kHz-100 kHz, the local correlation coefficient of the high-frequency band amplitude-frequency curve,>dividing 600kHz into high-frequency sections, finding out the curve correlation coefficient of each section, and using B21、B22、B23And (4) showing.
Further, the step of obtaining the voltage ratio deviation in step 1 is specifically as follows: according to different tapping positions, respectively measuring the voltages of high voltage to medium voltage, medium voltage to low voltage and high voltage to low voltage, and using miRepresents; starting voltage at tap position is m0Represents; voltage ratio deviation C0Is expressed according to a formulaObtaining C0；
Wherein m is0Is mH-MOr mM-LOr mH-L；mH-MFor high to medium initial voltage at the tap position, mH-LFor medium to low voltage initial voltage at the tap position, mH-LIs the initial voltage of high voltage to low voltage at the tapping position;
miis miH-MOr miM-LOr miH-L；miH-MFor the voltage of high to medium voltage at the tap position, miM-LFor medium to low voltage at the tap location, miH-LHigh to low voltage at the tap location.
Further, the specific steps of obtaining the relative change rate in step 1 are as follows: obtaining the capacitance C' between the high voltage winding and the medium voltage windingH-MCapacitance C' between the medium voltage winding and the low voltage windingM-LCapacitance C' between high-voltage winding and low-voltage windingH-L(ii) a Obtaining the ground capacitance C of the high-voltage winding'HAnd medium voltage winding to ground capacitor C'MAnd low-voltage winding to ground capacitor C'L；
According to the formulaObtaining the relative change rate D of the capacitance between windings1：
According to the formulaObtaining the relative change rate D of the grounding capacitance of the winding2：
Wherein: c ″)0Is an initial value of inter-winding capacitance, C'0Is an initial value of the capacitance to ground; c' is CH-MOr C ″M-LOr C ″H-L(ii) a C 'is C'HOr C'MOr C'L。
Further, the step 2 of obtaining the winding deformation degree detection result specifically includes the following steps:
relative rate of change A0Divided into four grades, and a first primary evaluation result E is obtained according to the following table1；
The overall correlation coefficient B1Divided into four grades, and a second primary evaluation result E is obtained according to the following table2；
Multiplying the primary evaluation result by the relative influence factor to obtain a secondary evaluation result, and summing to obtain a result AB, which is expressed as follows:
AB＝F1+F2＝E1×p1+E2×q1
wherein: p is a radical of1Relative influence factor, q, for short-circuit impedance method detection results1Relative influence factors of the detection result of the frequency response integral correlation coefficient method are adopted; f1、F2Is a secondary evaluation result;
judging the result AB of each phase of each winding according to the following table to obtain a winding deformation degree detection result;
further, the step of obtaining the inter-turn or inter-cake short circuit evaluation result BC in step 3 is specifically as follows: correlating the amplitude-frequency curve of the low frequency band with the coefficient B21Divided into four grades, and the third primary evaluation result E is determined according to the following table3；
Deviation of voltage ratio C0The voltage ratio deviation relative quantity of each winding is obtained according to the following formula
Wherein,is composed ofOrOrC0H-MIs the voltage ratio deviation of the high-voltage and medium-voltage windings, C0H-LDeviation of voltage ratio of high-voltage to low-voltage windings, C0M-LThe voltage ratio deviation of the medium-voltage winding and the low-voltage winding is obtained;
fourth preliminary evaluation result E4The values are given according to the following table:
multiplying the primary evaluation result by the relative influence factor to obtain a secondary evaluation result, and summing to obtain a result BC, wherein the result BC is expressed as follows:
BC＝F3+F4＝E3×p2+E4×q2
wherein p is2A relative influence factor, q, of a frequency response low-frequency-band correlation coefficient method detection result2Relative influence factors of the detection results of a voltage ratio test method; f3、F4Is a secondary evaluation result;
judging the result BC of each phase of each winding according to the following table to obtain deformation detection results such as short circuit between turns or between cakes;
further advance toStep by step, the winding distortion or bulge and other local deformation evaluation results BD of the step 41The acquisition steps are as follows:
correlating the intermediate frequency range amplitude-frequency curve with the coefficient B22Divided into three grades, and the fifth primary evaluation result E is determined according to the following table5；
The relative change rate D of the capacitance between windings1The sixth preliminary evaluation result E is determined according to the following table6；
Multiplying the primary evaluation result by the relative influence factor to obtain a secondary evaluation result, and summing to obtain a result BD1Expressed as follows:
BD1＝F5+F6＝E5×p3+E6×q3
wherein p is3Relative influence factor q of frequency response intermediate frequency band correlation coefficient detection result3The relative influence factor of the detection result of the capacitance method among the windings is shown; f5、F6Is a secondary evaluation result;
the result BD of each winding of each phase1Judging according to the following table to obtain the winding deformation type and degree detection results of local deformation such as winding distortion or bulge;
further, the winding coil integral displacement or lead displacement deformation evaluation result BD of step 52ObtainingThe method comprises the following steps:
correlating the amplitude-frequency curve of the high frequency band with the coefficient B23Dividing into three grades, and determining seventh primary evaluation result E according to the following table7；
Relative change rate D of winding to ground capacitance2The eighth preliminary evaluation result E is determined according to the following table8；
Multiplying the primary evaluation result by the relative influence factor to obtain a secondary evaluation result, and summing to obtain a result BD2Expressed as follows:
BD2＝F7+F8＝E7×p4+E8×q4
wherein p is4A relative influence factor q of a frequency response high frequency band correlation coefficient method detection result4The relative influence factor of the detection result of the winding capacitance to ground capacitance method is shown; f7、F8Is a secondary evaluation result;
the result BD of each winding of each phase2Judging according to the following table to obtain detection results of the deformation types and degrees of the integral displacement of the winding coil or the displacement of the lead wire and the like;
relative influence factor p in steps 2, 3, 4 and 5n、qnSpecifically, the following are shown:
wherein x isn、ynRepresenting the reliability of the detection method;
n may be 1, 2, 3 or 4, and x is not less than 0n≤1,0≤yn≤1,0≤pn≤1,0≤qn≤1。
Generally speaking, compared with the prior art, the technical scheme provided by the invention organically combines 4 methods such as the existing frequency response method, the short-circuit impedance method, the winding capacitance method, the voltage ratio test method and the like, firstly adopts a single method to obtain a preliminary test result, then analyzes each test result according to the judgment standard provided by the invention to obtain a primary detection result, then combines relative influence factors of various test methods to obtain secondary detection results such as different deformation phases, windings, types and severity degrees, and finally obtains a more accurate transformer winding deformation detection result through logic or operation. Therefore, the following advantageous effects can be obtained: the influence of subjective factors on tests and detection results is effectively reduced, the advantages of various test methods in detecting the deformation of the winding are fully exerted, the limitation of a single method in judging the deformation of the winding is avoided, the accuracy and the reliability of detection and analysis of the deformation of the winding are improved, and the waste of manpower and material resources caused by misjudgment and the economic loss caused by power-off maintenance are reduced.
Drawings
FIG. 1 is a process schematic of the integrated analytical method of the present invention;
FIG. 2 is a schematic diagram of a winding and phase difference result for determining deformation according to the present invention;
FIG. 3 is a schematic diagram illustrating the determination of turn-to-turn or pancake-to-pancake short circuits according to the present invention;
FIG. 4 is a schematic diagram illustrating a result of determining local deformation such as winding distortion or bulge according to the present invention;
FIG. 5 is a schematic diagram of an analysis process for determining the overall displacement of the winding coil or the deformation of the lead according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a method for detecting the deformation of a power transformer winding, which comprehensively utilizes a short-circuit impedance method, a voltage ratio test, a winding capacitance method and a voltage ratio test on the basis of the prior art, integrates long-term working experience of engineering personnel into the test results, analyzes 4 detection results, and logically processes all the detection results to obtain a comprehensive detection result. The advantages of various methods are integrated, the advantage of various methods in detecting the deformation of a certain winding is highlighted, the advantage maximization is realized, and the accuracy and the reliability of transformer winding deformation analysis and diagnosis are improved through comprehensive analysis of results obtained by various detection methods.
Fig. 1 is a schematic processing diagram of the analysis method provided by the present invention, which includes the following steps:
step 1: obtaining the change rate of the short circuit impedance, which comprises the following steps: measuring short-circuit impedance Z between high-voltage winding and medium-voltage windingH-MShort-circuit impedance Z between high-voltage winding and low-voltage windingH-LShort-circuit impedance Z between medium-voltage winding and low-voltage windingM-L；
According to the formulaObtaining the relative change rate A of the short-circuit impedance0(ii) a Wherein Z is0Representing an initial value of the short-circuit impedance; z1Is ZH-MOr ZH-LOr ZM-L。
According to a transverse comparison method of standard DLT911-2004 'frequency response analysis method for winding deformation of power transformer', amplitude-frequency response curves of low-voltage, medium-voltage and high-voltage windings are measured, and then correlation coefficients B of different curves of the same winding are respectively calculated1；
According to a transverse comparison method of a standard DLT911-2004 frequency response analysis method for winding deformation of a power transformer, amplitude-frequency response curves of low-voltage, medium-voltage and high-voltage windings are measured, and the change information of wave crest and wave trough positions of the amplitude-frequency response curves is obtained, wherein the low frequency band belongs to 1 kHz-100 kHz, the medium frequency band belongs to 100 kHz-600 kHz,>600kHz belongs to a high-frequency band division region, and a curve correlation coefficient B of each region is respectively calculated21、B22、B23；
According to different tapping positions, respectively measuring voltages m of high voltage to medium voltage, medium voltage to low voltage and high voltage to low voltagei(ii) a According to the formulaObtaining a voltage ratio deviation C0；
Wherein m is0Indicating the starting voltages of high voltage to medium voltage, medium voltage to low voltage and high voltage to low voltage at the tap location.
Obtaining the relative change rate, which comprises the following steps: measuring the capacitance C between the high and medium voltage windingsH-MCapacitance C' between the medium voltage winding and the low voltage windingM-LCapacitance C' between high-voltage winding and low-voltage windingH-L(ii) a Measuring high-voltage winding ground capacitance C'HAnd medium voltage winding to ground capacitor C'MAnd low-voltage winding to ground capacitor C'L；
According to the formulaObtaining the relative change rate D of the capacitance between windings1；
According to the formulaObtaining the relative change rate D of the grounding capacitance of the winding2；
Wherein: c ″)0Is an initial value of inter-winding capacitance, C'0Is an initial value of the capacitance to ground; c' is CH-MOr C ″M-LOr C ″H-L(ii) a C 'is C'HOr C'MOr C'L。
Step 2: obtaining the evaluation result AB of the deformed winding and the phase difference, and obtaining the detection conclusion G of the deformed winding and the phase difference equal deformation1(ii) a The basic process is shown in fig. 2, and specifically as follows: according to the relative rate of change A of the short-circuit impedance0Integral correlation coefficient B with amplitude-frequency curve1Respectively obtaining primary evaluation results E1、E2The method comprises the following steps:
relative rate of change A0Divided into four grades, and a first primary evaluation result E is obtained according to the following table1：
The overall correlation coefficient B1Divided into four grades, and a second primary evaluation result E is obtained according to the following table2；
The primary evaluation result and the relative influence factor p are compared1、q1Multiplying to obtain a secondary evaluation result F1、F2Summing results AB, expressed as follows:
AB＝F1+F2＝E1×p1+E2×q1
judging the result AB of each phase winding according to the following table to obtain the winding with deformation and the phase-class equal deformation detection conclusion G1：
And step 3: evaluating results BC of short circuit among turns or among cakes are obtained, and a short circuit detection conclusion G among turns or among cakes is obtained2(ii) a The basic process is shown in fig. 3, and specifically as follows:
according to the correlation coefficient B of the amplitude-frequency curve of the low frequency band21Deviation from sum voltage ratio C0Respectively obtaining primary evaluation results E3、E4The method comprises the following steps:
correlating the amplitude-frequency curve of the low frequency band with the coefficient B21Divided into four grades, and the third primary evaluation result E is determined according to the following table3；
Deviation of voltage ratio C0The voltage ratio deviation relative quantity of each winding is obtained according to the following formula
Wherein,is composed ofOrOrC0H-MIs the voltage ratio deviation, C, of the high-voltage and medium-voltage windings0H-LIs the voltage ratio deviation of the high-voltage winding and the low-voltage winding, C0M-LThe voltage ratio deviation of the medium-voltage winding and the low-voltage winding is obtained;
fourth preliminary test result E4The values are given according to the following table:
the primary evaluation result and the relative influence factor p are compared2、q2Multiplying to obtain a secondary evaluation result F3、F4The evaluation results BC are summed up and are represented as follows:
BC＝F3+F4＝E3×p2+E4×q2
judging the result BC of each phase of each winding according to the following table to obtain a deformation detection conclusion G of short circuit between turns or between cakes2：
And 4, step 4: obtaining local deformation results BD of winding distortion or bulge1Obtaining the detection conclusion G of local deformation such as winding distortion or bulge3(ii) a The basic process is shown in fig. 4, and specifically as follows: according to the correlation coefficient B of the amplitude-frequency curve of the intermediate frequency band22And the relative rate of change of capacitance D between windings1Respectively obtaining primary evaluation results E5、E6The method comprises the following steps:
correlating the intermediate frequency range amplitude-frequency curve with the coefficient B22Divided into three grades, and the fifth primary evaluation result E is determined according to the following table5；
The relative change rate D of the capacitance between windings1The sixth preliminary evaluation result E is determined according to the following table6；
The primary evaluation result and the relative influence factor p are compared3、q3Multiplying to obtain a secondary evaluation result F5、F6And summing to obtain the result BD1Expressed as follows:
BD1＝F5+F6＝E5×p3+E6×q3
the result BD of each winding of each phase1Judging according to the following table to obtain a detection conclusion G of local deformation such as winding distortion or bulge3：
And 5: obtaining the overall displacement of the winding coil or the lead displacement deformation detection result BD2Obtaining the analysis conclusion G of the overall displacement or the lead displacement4(ii) a The basic process is shown in fig. 5, and specifically as follows: according to the correlation coefficient B of the amplitude-frequency curve of the high frequency band23And the relative rate of change of the winding-to-ground capacitance D2Respectively obtaining primary evaluation results E7、E8The method comprises the following steps:
correlating the amplitude-frequency curve of the high frequency band with the coefficient B23Dividing into three grades, and determining seventh primary evaluation result E according to the following table7；
Relative change rate D of winding to ground capacitance2The eighth preliminary evaluation result E is determined according to the following table8；
The primary evaluation result and the relative influence factor p are compared4、q4Multiplying to obtain a secondary evaluation result F7、F8And summing to obtain the result BD2Expressed as follows:
BD2＝F7+F8＝E7×p4+E8×q4
the result BD of each winding of each phase2Judging according to the following table to obtain the detection conclusion G of deformation such as integral displacement or lead displacement4：
Step 6: the detection result G is1、G2、G3、G4And carrying out logic or operation to obtain a comprehensive detection result G.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A method for detecting the deformation of a winding of a power transformer, characterized in that it comprises the following steps:
step 1: acquiring the short-circuit impedance of the winding by adopting a low-voltage short-circuit impedance method, and acquiring the relative change rate of the short-circuit impedance according to the short-circuit impedance;
acquiring an integral correlation coefficient of a winding amplitude-frequency response curve by adopting a frequency response method;
obtaining the peak and trough changes of the amplitude-frequency response curve of the low, medium and high frequency winding sections by adopting a frequency response method, and obtaining the local correlation coefficients of the amplitude-frequency response curve of the low, medium and high frequency winding sections according to the peak and trough changes of the amplitude-frequency response curve;
obtaining a winding resistance transformation ratio and voltage ratio deviation by adopting a voltage ratio test method;
acquiring a capacitance value between windings, a capacitance value of the windings to the ground, a relative change rate of the capacitance between the windings and a relative change rate of the capacitance to the ground of the windings by adopting a winding capacitance method;
step 2: obtaining a winding deformation degree detection result according to the relative change rate of the short-circuit impedance and the integral correlation coefficient of the amplitude-frequency response curve;
and step 3: obtaining a short circuit detection result between turns or between cakes according to the correlation coefficient of the low-frequency amplitude-frequency curve and the voltage ratio deviation;
and 4, step 4: obtaining a detection result of winding distortion or local bulge deformation according to the correlation coefficient of the intermediate frequency range amplitude-frequency curve and the relative change rate of capacitance between windings;
and 5: obtaining the detection result of the whole displacement of the winding coil or the displacement deformation of the lead according to the correlation coefficient of the high-frequency-band amplitude-frequency curve and the relative change rate of the ground capacitance of the winding;
step 6: carrying out logic or operation on the winding deformation degree detection result, the turn-to-turn or cake-to-cake short circuit detection result, the local deformation detection result and the winding coil integral displacement or lead displacement deformation detection result to obtain a transformer winding deformation comprehensive detection result for indicating a deformation occurrence part, a deformation type and a deformation degree;
step 2, the concrete steps of obtaining the detection result of the deformation degree of the winding are as follows:
presetting the relative change rate range of the short-circuit impedance to 4 grades, and acquiring a first primary evaluation result E according to the grade of the value of the relative change rate of the short-circuit impedance1(ii) a Dividing the overall correlation coefficient into 3 grades, and obtaining a second primary evaluation result E according to the grade of the overall correlation coefficient value2；
According to the first primary evaluation result E1Second preliminary evaluation result E2And formula AB ═ E1×p1+E2×q1Acquiring a winding subjected to deformation and a phase difference evaluation result AB;
presetting winding and phase evaluation results to 4 levels corresponding to the deformation degree, and performing deformation judgment according to the level of the AB value of each phase winding to obtain a winding deformation degree detection result;
wherein p is1Relative influence factor, q, for short-circuit impedance method detection results1Relative influence factors of the detection result of the frequency response integral correlation coefficient method are adopted;
the specific steps for obtaining the detection result of the short circuit between turns or between cakes in the step 3 are as follows:
dividing the correlation coefficient of the low-frequency range amplitude-frequency curve into 4 grades, and determining a third primary evaluation result E according to the grade of the correlation coefficient value of the low-frequency range amplitude-frequency curve3；
Obtaining the relative quantity of voltage ratio deviation of each winding according to the following formulaIs composed ofOrOr
Will be provided withIs divided into 3 classes according toDetermining a fourth primary detection result E in the interval range of the value4；
According to the third primary evaluation result E3Fourth preliminary evaluation result E4And formula BC ═E3×p2+E4×q2Obtaining an inter-turn or inter-cake short circuit evaluation result BC;
presetting the inter-turn or inter-cake short circuit evaluation result into 4 grades corresponding to the winding deformation type and the deformation degree, and judging according to the grade of each phase of each winding BC value to obtain an inter-turn or inter-cake short circuit detection result;
wherein, C0H-MIs the voltage ratio deviation of the high-voltage and medium-voltage windings, C0H-LDeviation of voltage ratio of high-voltage to low-voltage windings, C0M-LThe voltage ratio deviation of the medium-voltage winding and the low-voltage winding is obtained; p is a radical of2A relative influence factor, q, of a frequency response low-frequency-band correlation coefficient method detection result2Relative influence factors of the detection results of a voltage ratio test method;
the specific steps for obtaining the detection result of local deformation such as winding distortion or bulge in the step 4 are as follows:
dividing the correlation coefficient of the intermediate frequency range amplitude-frequency curve into 3 grades, and determining a fifth primary evaluation result E according to the grade of the correlation coefficient value of the intermediate frequency range amplitude-frequency curve5(ii) a The relative change rate D of the capacitance between windings1Divided into 4 classes according to D1Obtaining a sixth primary evaluation result E according to the grade of the value6；
According to the fifth primary evaluation result E5Sixth preliminary evaluation result E6And formula BD1＝E5×p3+E6×q3Obtaining local deformation evaluation result BD1；
Presetting the local deformation evaluation result to 4 levels corresponding to the winding deformation type and the deformation degree, and according to each phase of each winding BD1Judging the grade of the value to obtain a local deformation detection result;
wherein p is3Relative influence factor q of frequency response intermediate frequency band correlation coefficient detection result3The relative influence factor of the detection result of the capacitance method among the windings is shown;
the specific steps for obtaining the type and degree detection result of the integral displacement or lead displacement deformation of the winding coil in the step 5 are as follows:
curve of amplitude and frequency of high frequency bandThe correlation coefficient is divided into 3 grades, and a seventh primary evaluation result E is determined according to the grade of the correlation coefficient value of the high-frequency amplitude-frequency curve7(ii) a Relative change rate D of winding to ground capacitance2Divided into 4 classes according to D2Determining an eighth preliminary evaluation result E according to the grade corresponding to the value8；
According to the seventh primary evaluation result E7The eighth primary evaluation result E8And formula BD2＝E7×p4+E8×q4Obtaining the evaluation result BD of the whole displacement or lead displacement deformation of the winding coil2；
Presetting the evaluation result of the whole displacement of the winding coil or the displacement deformation of the lead to 4 grades corresponding to the type and the degree of the deformation of the winding, and according to each phase of each winding BD2Judging the grade of the value to obtain the detection result of the integral displacement of the winding coil or the displacement deformation of the lead;
wherein p is4A relative influence factor q of a frequency response high frequency band correlation coefficient method detection result4The relative influence factor of the detection result of the winding capacitance to ground capacitance method is shown.
2. The detection method according to claim 1, wherein in step 1, the detection is performed according to a formulaObtaining the relative change rate A of the short circuit impedance0；
Wherein Z0Is the initial value of the short-circuit impedance; z1Is ZH-MOr ZH-LOr ZM-L；ZH-MIs the short-circuit impedance between the high-voltage winding and the medium-voltage winding, ZH-LIs the short-circuit impedance between the high-voltage winding and the low-voltage winding, ZM-LIs the short circuit impedance between the medium voltage winding and the low voltage winding.
3. The detection method according to claim 1, wherein in step 1, the detection is performed according to a formulaObtaining a voltage ratio deviation C0；
Wherein m is0Is mH-MOr mM-LOr mH-L；mH-MFor high to medium initial voltage at the tap position, mH-LFor medium to low voltage initial voltage at the tap position, mH-LIs the initial voltage of high voltage to low voltage at the tapping position;
miis miH-MOr miM-LOr miH-L；miH-MFor the voltage of high to medium voltage at the tap position, miM-LFor medium to low voltage at the tap location, miH-LHigh to low voltage at the tap location.
4. The detection method according to claim 1, wherein in step 1, the detection is performed according to a formulaObtaining the relative change rate D of the capacitance between windings1According to the formulaObtaining the relative change rate D of the grounding capacitance of the winding2；
Wherein, C ″)0Is an initial value of inter-winding capacitance, C'0Is an initial value of the capacitance to ground; c' is CH-MOr C ″M-LOr C ″H-L；C″H-MIs the capacitance, C ″, between the high-voltage winding and the medium-voltage windingM-LIs the capacitance, C ″, between the medium and low voltage windingsH-LThe capacitor is arranged between the high-voltage winding and the low-voltage winding;
c 'is C'HOr C'MOr C'L；C′HIs high voltage winding capacitance to ground, C'MIs medium voltage winding capacitance to ground, C'LIs a low voltage winding capacitance to ground.
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| CN105823960A (en) * | 2016-03-18 | 2016-08-03 | 国家电网公司 | Method and system for comprehensively diagnosing deformation of transformer winding |
| CN106443229A (en) * | 2016-08-04 | 2017-02-22 | 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 | Transformer winding deformation diagnosis method |
| CN108279359A (en) * | 2018-02-05 | 2018-07-13 | 国网山西省电力公司电力科学研究院 | Dry-type reactor interturn insulation method for diagnosing faults based on frequency response analysis |
| 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 |
| CN108896162B (en) * | 2018-04-02 | 2019-09-06 | 西南交通大学 | A kind of recognition methods of AT power supply rewinding material auto-transformer failure winding |
| CN108917906B (en) * | 2018-04-02 | 2019-08-02 | 西南交通大学 | A kind of tractive transformer winding deformation fault detection method |
| CN108693432A (en) * | 2018-04-27 | 2018-10-23 | 国家电网公司 | A kind of tester of deformation of transformer winding |
| CN110006325A (en) * | 2019-03-11 | 2019-07-12 | 国网江苏省电力有限公司淮安供电分公司 | A kind of deformation of transformer winding intelligent detecting method based on frequency sweep impedance |
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| 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 |
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