CN108896162A - A kind of recognition methods of AT power supply rewinding material auto-transformer failure winding - Google Patents

A kind of recognition methods of AT power supply rewinding material auto-transformer failure winding Download PDF

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CN108896162A
CN108896162A CN201810284699.7A CN201810284699A CN108896162A CN 108896162 A CN108896162 A CN 108896162A CN 201810284699 A CN201810284699 A CN 201810284699A CN 108896162 A CN108896162 A CN 108896162A
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winding
frequency
failure
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total
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CN108896162B (en
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江俊飞
周利军
严静荷
蔡君懿
李威
郭蕾
张陈擎宇
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Southwest Jiaotong University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
    • G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means

Abstract

The invention discloses a kind of recognition methods of AT power supply rewinding material auto-transformer failure winding, the method using frequency response method combination winding capacity measurement judges winding state, the specific steps are：Test the total (frequency) response curve of public winding and winding of connecting；Frequency response curve is divided into three frequency ranges and extracts the failure that related coefficient judges whether there is character pair；The frequency response curve of failure then independent measurement public winding if it exists, and judge whether there is the failure of character pair；Failure then measures the frequency response curve and series connection winding-to-earth capacity of series connection winding if it exists, and judges winding state of connecting.Present invention utilizes frequency response method combination winding-to-earth capacity methods of testing, can comprehensively be analyzed auto-transformer Split type winding, and the accuracy of the evaluation to such transformer winding state is increased.

Description

A kind of recognition methods of AT power supply rewinding material auto-transformer failure winding
Technical field
The invention belongs to Fault Diagnosis for Electrical Equipment technical fields, and in particular to a kind of AT power supply rewinding material auto-transformer The recognition methods of failure winding.
Background technique
AT power supply system has many advantages, such as that impedance of traction electric network is small, power supply distance is long, is the traction being most widely used at present Power supply mode, rewinding material auto-transformer have the characteristics that no-load loss is small, noise is low, and the core for becoming AT power supply system is set One of standby, safe and reliable operation is great to the security implications for ensureing tractive power supply system.Winding deformation is traction impact load Under common transformer fault, reliably and effectively transformer winding state is confirmed, and take measures effectively to be promoted and lead Draw the reliability of power supply system.
Frequency response method is the transformer winding fault detection method being most widely used at present, possesses measurement sensitivity height And the characteristics of strong antijamming capability, but it is difficult to the feelings analyzed there are winding state when detecting AT power supply auto-transformer Condition.This is because tractive power supply system to auto-transformer resistance requirements less than 0.45 Ω, AT power supply with auto-transformer usually Using radial Split type winding structure, the winding of division can not be to each in inside transformer connection, frequency of use response method Division winding measures, and is difficult to have any actual knowledge of the state of internal two windings when being analyzed, and hangs cover inspection and be also required to It unlocks winding observation, it is very long to expend the time, it is difficult to quickly be further analysed to field working conditions.And there is no related at present Ratio be more comprehensively directed to winding frequency response test and the state analysis method of such auto-transformer, therefore volume iron need to be studied The recognition methods of heart auto-transformer failure winding, this has great meaning for the O&M of the following rewinding material auto-transformer Justice.
Summary of the invention
In view of the above-mentioned problems, it is that public winding does not divide that the present invention, which provides one kind for winding construction, series connection winding division It is placed in the recognition methods of the failure winding of the auto-transformer of public winding two sides, this method passes through to different windings, different frequencies Frequency-response characteristic value is extracted within the scope of rate and comparison obtains that there may be the winding of failure and fault types, and combination is electric over the ground Hold measurement and further judge specific failure winding, provides more information for field working conditions analysis.The present invention is by following skill What art means were realized：
1) the test frequency response sequence X of public winding and winding of connecting is obtained using frequency response tester1(f) and Reference frequency response sequence X2(f), frequency f range is 1kHz-1MHz；Low-frequency range 1kHz-100kHz, Mid Frequency are drawn out respectively Frequency response curve in tri- frequency ranges of 100kHz-600kHz and high band 600kHz-1MHz；
1.1 are directed to different frequency range, calculate the related coefficient of each frequency range as follows：
Cov is two sequence covariances in formula, and Var is serial variance；
1.2 are directed to different frequency range, calculate the Fault characteristic parameters of each frequency range as follows, including
1.2.1 it is fitted respectively using fast relaxation Vector Matching Arithmetic and seeks curve transmission function rational fraction：
N is fitting order in formula, and s is Laplace operator, a0、a1、…、an-1And b0、…、bn-1Respectively each rank denominator And numerator coefficients；
1.2.2 to coefficient a0、a1、…、an-1And b0、b1、…、bn-1Arrange deforming and obtains two coefficient sequence Xa、Xb It is as follows：
Xa=[log | a0|log|a1|…log|an-1|], Xb=[log | b0|log|b1|…log|bn-1|],
1.2.3 Kendall's tau coefficient τ of the fault condition relative to coefficient sequence under normal circumstances is calculated：
Wherein C indicates the element logarithm for possessing consistency in two sequences；D indicates to possess inconsistency in two sequences Element logarithm, N are total element number of each sequence；It calculates separately to obtain coefficient sequence X based on above-mentioned formulaa, XbKen Deer Coefficient of rank correlation τa、τb；
1.2.4 by fault condition relative to coefficient sequence X under normal circumstancesa, XbKendall's tau coefficient τa、τb Arrange deforming and obtains Fault characteristic parameters：
2) according to the method for step 1), acquire respectively each frequency range of public winding related coefficient and each frequency range Fault characteristic parameters；According to the method for step 1), the related coefficient of each frequency range of series connection winding and each is acquired respectively The Fault characteristic parameters of frequency range；
3) judged according to low-frequency range related coefficient and Fault characteristic parameters, it is as follows：
3.1 compare public winding and series connection winding low-frequency range related coefficient：If RPublic string-low frequency>=2 normal；Otherwise there is circle Between or cake between short trouble, further relatively public winding and series connection winding low-frequency range Fault characteristic parameters：If τTotal public affairs string-low frequency≤ L1, then winding is minor failure；If L1<τTotal public affairs string-low frequency≤ L2, then winding is moderate failure；If τTotal public affairs string-low frequency> L2, then around Group is severe failure；Wherein the value range of L1 is [0.7,0.9], and the value range of L2 is [1.3,1.5]；
3.2 compare public winding low-frequency range related coefficient：
If 3.2.1 RPublic affairs-low frequency>=2, then public winding is normal, and there are short troubles between turn-to-turn or cake for series connection winding, further Compare series connection winding low-frequency range Fault characteristic parameters：If τTotal string-low frequency≤ L1, then winding is minor failure；If L1<τTotal string-low frequency ≤ L2, then winding is moderate failure；If τTotal string-low frequency> L2, then winding is severe failure；
If 3.2.2 RPublic affairs-low frequency<2, then there are short-circuit between turn-to-turn or cake, further relatively public winding low-frequency ranges for public winding Fault characteristic parameters：If τTotal public affairs-low frequency≤ L1, then winding is minor failure；If L1<τTotal public affairs-low frequency≤ L2, then winding is moderate event Barrier；If τTotal public affairs-low frequency> L2, then winding is severe failure；
3.3 compare series connection winding low-frequency range related coefficient：If RString-low frequency>=2, then winding of connecting is normal；Otherwise it connects winding There are short trouble between turn-to-turn or cake, winding low-frequency range Fault characteristic parameters of further relatively connecting：If τTotal string-low frequency≤ L1, then Winding is minor failure；If L1<τTotal string-low frequency≤ L2, then winding is moderate failure；If τTotal string-low frequency> L2, then winding is severe Failure；
4) judged according to Mid Frequency related coefficient and Fault characteristic parameters, it is as follows：
4.1 compare public winding and series connection winding Mid Frequency related coefficient：If RPublic string-intermediate frequency>=1 normal；Otherwise exist and turn round Bent or bulge failure further compares public winding and series connection winding Mid Frequency Fault characteristic parameters：If τTotal public affairs string-intermediate frequency≤ L1, Then winding is minor failure；If L1<τTotal public affairs string-intermediate frequency≤ L2, then winding is moderate failure；If τTotal public affairs string-intermediate frequency> L2, then winding be Severe failure；
4.2 compare public winding Mid Frequency related coefficient：
If 4.2.1 RPublic affairs-intermediate frequency>=1, then public winding is normal, and series connection winding has distortion or bulge failure, further relatively Series connection winding Mid Frequency Fault characteristic parameters：If τTotal string-intermediate frequency≤ L1, then winding is minor failure；If L1<τTotal string-intermediate frequency≤ L2, Then winding is moderate failure；If τTotal string-intermediate frequency> L2, then winding is severe failure；
If 4.2.2 RPublic affairs-intermediate frequency<1, then there is distortion or bulge failure in public winding, further compare public winding Mid Frequency Fault characteristic parameters：If τTotal public affairs-intermediate frequency≤ L1, then winding is minor failure；If L1<τTotal public affairs-intermediate frequency≤ L2, then winding is moderate event Barrier；If τTotal public affairs-intermediate frequency> L2, then winding is severe failure；
4.3 compare series connection winding Mid Frequency related coefficient：If RString-intermediate frequency>=1, then winding of connecting is normal；Otherwise it connects winding In the presence of distortion or bulge failure, winding Mid Frequency Fault characteristic parameters of further relatively connecting：If τTotal string-intermediate frequency≤ L1, then winding For minor failure；If L1<τTotal string-intermediate frequency≤ L2, then winding is moderate failure；If τTotal string-intermediate frequency> L2, then winding is severe event Barrier；
If there is distortion or bulge failure in 4.4 series connection windings, further measurement series connection winding-to-earth capacity, if electric over the ground Hold change rate >=5%, then there is distortion or bulge close to the series connection winding of iron core, if direct-to-ground capacitance change rate<5%, then it is close There is distortion or bulge in the series connection winding of fuel tank；
5) judged according to high band related coefficient and Fault characteristic parameters, it is as follows：
5.1 compare public winding and series connection winding high band related coefficient：If RPublic string-high frequency>=0.6 normal, otherwise exists Integral shift further compares public winding and series connection winding high band Fault characteristic parameters：If τTotal public affairs string-high frequency≤ L1, then around Group is minor failure；If L1<τTotal public affairs string-high frequency≤ L2, then winding is moderate failure；If τTotal public affairs string-high frequency> L2, then winding is severe Failure；
5.2 compare public winding high band related coefficient：
If 5.2.1 RPublic affairs-high frequency>=0.6, then public winding is normal, and there are integral shift failures for series connection winding, further relatively Series connection winding high band Fault characteristic parameters：If τTotal string-high frequency≤ L1, then winding is minor failure；If L1<τTotal string-high frequency≤ L2, Then winding is moderate failure；If τTotal string-high frequency> L2, then winding is severe failure；
If 5.2.2 RPublic affairs-intermediate frequency<0.6, then there are integral shift failures for public winding, further compare public winding high band Fault characteristic parameters：If τTotal public affairs-high frequency≤ L1, then winding is minor failure；If L1<τTotal public affairs-high frequency≤ L2, then winding is moderate event Barrier；If τTotal public affairs-high frequency> L2, then winding is severe failure；
5.3 compare series connection winding high band related coefficient：If RString-high frequency>=0.6, then winding of connecting is normal；Otherwise connect around Group is there are integral shift failure, winding high band Fault characteristic parameters of further relatively connecting：If τTotal string-high frequency≤ L1, then winding For minor failure；If L1<τTotal string-high frequency≤ L2, then winding is moderate failure；If τTotal string-high frequency> L2, then winding is severe event Barrier；
If there are integral shifts for 5.4 series connection windings, series connection winding-to-earth capacity is further measured, if direct-to-ground capacitance changes Rate >=5%, then it is assumed that there is integral shift certainly close to iron core series connection winding, if direct-to-ground capacitance change rate<5%, then it is assumed that only With the presence of the series connection winding integral shift close to fuel tank.
A kind of recognition methods of AT power supply rewinding material auto-transformer failure winding, can be the case where not hanging cover The lower fault diagnosis with regard to realizing auto-transformer Split type winding, while it being directed to the Split type winding only connected in inside, in conjunction with Direct-to-ground capacitance test, can further judge the winding that is out of order, this method more can comprehensively obtain such transformer device structure Winding state, convenient for the analysis of field failure.
Detailed description of the invention
Fig. 1 is typical auto-transformer winding distribution and wiring schematic diagram in the present invention；
Fig. 2 is failure winding recognition methods flow chart in the present invention；
Fig. 3 is winding-to-earth capacity test schematic diagram of connecting in the present invention.
Specific embodiment
Implementing procedure of the invention is described in further detail with reference to the accompanying drawing.
Fig. 1 is distributed for a kind of relatively conventional winding of heretofore described auto-transformer and wiring diagram, wherein self coupling Transformer winding is divided into public winding and series connection winding, and public winding does not divide, and series connection winding is split into series connection winding 1 and series connection Winding 2 is placed in the structure of public winding two sides, and O, A, B are respectively the outlet port of each winding.
Fig. 2 is the flow chart of the recognition methods, and specific step is as follows：
1) the test frequency response sequence X of public winding and winding of connecting is obtained using frequency response tester1(f) and Reference frequency response sequence X2(f), frequency f range is 1kHz-1MHz；Low-frequency range 1kHz-100kHz, Mid Frequency are drawn out respectively Frequency response curve in tri- frequency ranges of 100kHz-600kHz and high band 600kHz-1MHz；
1.1 are directed to different frequency range, calculate the related coefficient of each frequency range as follows：
Cov is two sequence covariances in formula, and Var is serial variance；
1.2 are directed to different frequency range, calculate the Fault characteristic parameters of each frequency range as follows, including
1.2.1 it is fitted respectively using fast relaxation Vector Matching Arithmetic and seeks curve transmission function rational fraction：
N is fitting order in formula, and s is Laplace operator, a0、a1、…、an-1And b0、…、bn-1Respectively each rank denominator And numerator coefficients；
1.2.2 to coefficient a0、a1、…、an-1And b0、b1、…、bn-1Arrange deforming and obtains two coefficient sequence Xa、Xb It is as follows：
Xa=[log | a0|log|a1|…log|an-1|], Xb=[log | b0|log|b1|…log|bn-1|],
1.2.3 Kendall's tau coefficient τ of the fault condition relative to coefficient sequence under normal circumstances is calculated：
Wherein C indicates the element logarithm for possessing consistency in two sequences；D indicates to possess inconsistency in two sequences Element logarithm, N are total element number of each sequence；It calculates separately to obtain coefficient sequence X based on above-mentioned formulaa, XbKen Deer Coefficient of rank correlation τa、τb；
1.2.4 by fault condition relative to coefficient sequence X under normal circumstancesa, XbKendall's tau coefficient τa、τb Arrange deforming and obtains Fault characteristic parameters：
2) according to the method for step 1), acquire respectively each frequency range of public winding related coefficient and each frequency range Fault characteristic parameters；According to the method for step 1), the related coefficient of each frequency range of series connection winding and each is acquired respectively The Fault characteristic parameters of frequency range；
3) judged according to low-frequency range related coefficient and Fault characteristic parameters, it is as follows：
3.1 compare public winding and series connection winding low-frequency range related coefficient：If RPublic string-low frequency>=2 normal；Otherwise there is circle Between or cake between short trouble, further relatively public winding and series connection winding low-frequency range Fault characteristic parameters：If τTotal public affairs string-low frequency≤ L1, then winding is minor failure；If L1<τTotal public affairs string-low frequency≤ L2, then winding is moderate failure；If τTotal public affairs string-low frequency> L2, then around Group is severe failure；Wherein the value range of L1 is [0.7,0.9], and the value range of L2 is [1.3,1.5]；
3.2 compare public winding low-frequency range related coefficient：
If 3.2.1 RPublic affairs-low frequency>=2, then public winding is normal, and there are short troubles between turn-to-turn or cake for series connection winding, further Compare series connection winding low-frequency range Fault characteristic parameters：If τTotal string-low frequency≤ L1, then winding is minor failure；If L1<τTotal string-low frequency ≤ L2, then winding is moderate failure；If τTotal string-low frequency> L2, then winding is severe failure；
If 3.2.2 RPublic affairs-low frequency<2, then there are short-circuit between turn-to-turn or cake, further relatively public winding low-frequency ranges for public winding Fault characteristic parameters：If τTotal public affairs-low frequency≤ L1, then winding is minor failure；If L1<τTotal public affairs-low frequency≤ L2, then winding is moderate event Barrier；If τTotal public affairs-low frequency> L2, then winding is severe failure；
3.3 compare series connection winding low-frequency range related coefficient：If RString-low frequency>=2, then winding of connecting is normal；Otherwise it connects winding There are short trouble between turn-to-turn or cake, winding low-frequency range Fault characteristic parameters of further relatively connecting：If τTotal string-low frequency≤ L1, then Winding is minor failure；If L1<τTotal string-low frequency≤ L2, then winding is moderate failure；If τTotal string-low frequency> L2, then winding is severe Failure；
4) judged according to Mid Frequency related coefficient and Fault characteristic parameters, it is as follows：
4.1 compare public winding and series connection winding Mid Frequency related coefficient：If RPublic string-intermediate frequency>=1 normal；Otherwise exist and turn round Bent or bulge failure further compares public winding and series connection winding Mid Frequency Fault characteristic parameters：If τTotal public affairs string-intermediate frequency≤ L1, Then winding is minor failure；If L1<τTotal public affairs string-intermediate frequency≤ L2, then winding is moderate failure；If τTotal public affairs string-intermediate frequency> L2, then winding be Severe failure；
4.2 compare public winding Mid Frequency related coefficient：
If 4.2.1 RPublic affairs-intermediate frequency>=1, then public winding is normal, and series connection winding has distortion or bulge failure, further relatively Series connection winding Mid Frequency Fault characteristic parameters：If τTotal string-intermediate frequency≤ L1, then winding is minor failure；If L1<τTotal string-intermediate frequency≤ L2, Then winding is moderate failure；If τTotal string-intermediate frequency> L2, then winding is severe failure；
If 4.2.2 RPublic affairs-intermediate frequency<1, then there is distortion or bulge failure in public winding, further compare public winding Mid Frequency Fault characteristic parameters：If τTotal public affairs-intermediate frequency≤ L1, then winding is minor failure；If L1<τTotal public affairs-intermediate frequency≤ L2, then winding is moderate event Barrier；If τTotal public affairs-intermediate frequency> L2, then winding is severe failure；
4.3 compare series connection winding Mid Frequency related coefficient：If RString-intermediate frequency>=1, then winding of connecting is normal；Otherwise it connects winding In the presence of distortion or bulge failure, winding Mid Frequency Fault characteristic parameters of further relatively connecting：If τTotal string-intermediate frequency≤ L1, then winding For minor failure；If L1<τTotal string-intermediate frequency≤ L2, then winding is moderate failure；If τTotal string-intermediate frequency> L2, then winding is severe event Barrier；
If there is distortion or bulge failure in 4.4 series connection windings, further measurement series connection winding-to-earth capacity, such as Fig. 3 institute Show, if direct-to-ground capacitance change rate >=5%, the series connection winding close to iron core has distortion or bulge, if direct-to-ground capacitance change rate< 5%, then there is distortion or bulge close to the series connection winding of fuel tank；
5) judged according to high band related coefficient and Fault characteristic parameters, it is as follows：
5.1 compare public winding and series connection winding high band related coefficient：If RPublic string-high frequency>=0.6 normal, otherwise exists Integral shift further compares public winding and series connection winding high band Fault characteristic parameters：If τTotal public affairs string-high frequency≤ L1, then around Group is minor failure；If L1<τTotal public affairs string-high frequency≤ L2, then winding is moderate failure；If τTotal public affairs string-high frequency> L2, then winding is severe Failure；
5.2 compare public winding high band related coefficient：
If 5.2.1 RPublic affairs-high frequency>=0.6, then public winding is normal, and there are integral shift failures for series connection winding, further relatively Series connection winding high band Fault characteristic parameters：If τTotal string-high frequency≤ L1, then winding is minor failure；If L1<τTotal string-high frequency≤ L2, Then winding is moderate failure；If τTotal string-high frequency> L2, then winding is severe failure；
If 5.2.2 RPublic affairs-intermediate frequency<0.6, then there are integral shift failures for public winding, further compare public winding high band Fault characteristic parameters：If τTotal public affairs-high frequency≤ L1, then winding is minor failure；If L1<τTotal public affairs-high frequency≤ L2, then winding is moderate event Barrier；If τTotal public affairs-high frequency> L2, then winding is severe failure；
5.3 compare series connection winding high band related coefficient：If RString-high frequency>=0.6, then winding of connecting is normal；Otherwise connect around Group is there are integral shift failure, winding high band Fault characteristic parameters of further relatively connecting：If τTotal string-high frequency≤ L1, then winding For minor failure；If L1<τTotal string-high frequency≤ L2, then winding is moderate failure；If τTotal string-high frequency> L2, then winding is severe event Barrier；
If there are integral shifts for 5.4 series connection windings, series connection winding-to-earth capacity is further measured, as shown in figure 3, if right Ground rate of change of capacitance >=5%, then it is assumed that there is integral shift certainly close to iron core series connection winding, if direct-to-ground capacitance change rate< 5%, then it is assumed that only close to the series connection winding of fuel tank, there are integral shifts.

Claims (1)

1. a kind of recognition methods of AT power supply rewinding material auto-transformer winding failure, which is characterized in that the auto-transformer Winding is that public winding does not divide, and series connection winding division is placed in the structure of public winding two sides；Include the following steps：
1) the test frequency response sequence X of public winding and winding of connecting is obtained using frequency response tester1(f) it and refers to Frequency response sequence X2(f), frequency f range is 1kHz-1MHz；Low-frequency range 1kHz-100kHz, Mid Frequency are drawn out respectively Frequency response curve in tri- frequency ranges of 100kHz-600kHz and high band 600kHz-1MHz；
1.1 are directed to different frequency range, calculate the related coefficient of each frequency range as follows：
Cov is two sequence covariances in formula, and Var is serial variance；
1.2 are directed to different frequency range, calculate the Fault characteristic parameters of each frequency range as follows, including
1.2.1 it is fitted respectively using fast relaxation Vector Matching Arithmetic and seeks curve transmission function rational fraction：
N is fitting order in formula, and s is Laplace operator, a0、a1、…、an-1And b0、…、bn-1Respectively each rank denominator and point Subsystem number；
1.2.2 to coefficient a0、a1、…、an-1And b0、b1、…、bn-1Arrange deforming and obtains two coefficient sequence Xa、XbIt is as follows：
Xa=[log | a0| log|a1| … log|an-1|], Xb=[log | b0| log|b1| … log|bn-1|],
1.2.3 calculating Kendall's tau coefficient τ of the fault condition relative to coefficient sequence under normal circumstances：
Wherein C indicates the element logarithm for possessing consistency in two sequences；D indicates the element for possessing inconsistency in two sequences Logarithm, N are total element number of each sequence；It calculates separately to obtain coefficient sequence X based on above-mentioned formulaa, XbKen Deer grade Related coefficient τa、τb；
1.2.4 by fault condition relative to coefficient sequence X under normal circumstancesa, XbKendall's tau coefficient τa、τbIt carries out whole Reason deformation obtains Fault characteristic parameters：
2) according to the method for step 1), the related coefficient of each frequency range of public winding and the event of each frequency range are acquired respectively Hinder characteristic parameter；According to the method for step 1), acquire respectively series connection winding each frequency range related coefficient and each frequency range Fault characteristic parameters；
3) judged according to low-frequency range related coefficient and Fault characteristic parameters, it is as follows：
3.1 compare public winding and series connection winding low-frequency range related coefficient：If RPublic string-low frequency>=2 normal；Otherwise there is turn-to-turn or cake Between short trouble, further relatively public winding and series connection winding low-frequency range Fault characteristic parameters：If τTotal public affairs string-low frequency≤ L1, then Winding is minor failure；If L1<τTotal public affairs string-low frequency≤ L2, then winding is moderate failure；If τTotal public affairs string-low frequency> L2, then winding is attached most importance to Spend failure；Wherein the value range of L1 is [0.7,0.9], and the value range of L2 is [1.3,1.5]；
3.2 compare public winding low-frequency range related coefficient：
If 3.2.1 RPublic affairs-low frequency>=2, then public winding is normal, and there are short troubles between turn-to-turn or cake for series connection winding, further relatively goes here and there Join winding low-frequency range Fault characteristic parameters：If τTotal string-low frequency≤ L1, then winding is minor failure；If L1<τTotal string-low frequency≤ L2, then Winding is moderate failure；If τTotal string-low frequency> L2, then winding is severe failure；
If 3.2.2 RPublic affairs-low frequency<2, then there are short-circuit between turn-to-turn or cake, further relatively public winding low frequency segment fault spies for public winding Levy parameter：If τTotal public affairs-low frequency≤ L1, then winding is minor failure；If L1<τTotal public affairs-low frequency≤ L2, then winding is moderate failure；If τTotal public affairs-low frequency> L2, then winding is severe failure；
3.3 compare series connection winding low-frequency range related coefficient：If RString-low frequency>=2, then winding of connecting is normal；Otherwise there are circles for series connection winding Between or cake between short trouble, further relatively series connection winding low-frequency range Fault characteristic parameters：If τTotal string-low frequency≤ L1, then winding be Minor failure；If L1<τTotal string-low frequency≤ L2, then winding is moderate failure；If τTotal string-low frequency> L2, then winding is severe failure；
4) judged according to Mid Frequency related coefficient and Fault characteristic parameters, it is as follows：
4.1 compare public winding and series connection winding Mid Frequency related coefficient：If RPublic string-intermediate frequency>=1 normal；Otherwise there is distortion or drum Packet failure further compares public winding and series connection winding Mid Frequency Fault characteristic parameters：If τTotal public affairs string-intermediate frequency≤ L1, then winding For minor failure；If L1<τTotal public affairs string-intermediate frequency≤ L2, then winding is moderate failure；If τTotal public affairs string-intermediate frequency> L2, then winding is severe event Barrier；
4.2 compare public winding Mid Frequency related coefficient：
If 4.2.1 RPublic affairs-intermediate frequency>=1, then public winding is normal, series connection winding exist distortion or bulge failure, further relatively series connection around Group Mid Frequency Fault characteristic parameters：If τTotal string-intermediate frequency≤ L1, then winding is minor failure；If L1<τTotal string-intermediate frequency≤ L2, then winding For moderate failure；If τTotal string-intermediate frequency> L2, then winding is severe failure；
If 4.2.2 RPublic affairs-intermediate frequency<1, then there is distortion or bulge failure in public winding, and further relatively the segment fault of public winding intermediate frequency is special Levy parameter：If τTotal public affairs-intermediate frequency≤ L1, then winding is minor failure；If L1<τTotal public affairs-intermediate frequency≤ L2, then winding is moderate failure；If τTotal public affairs-intermediate frequency> L2, then winding is severe failure；
4.3 compare series connection winding Mid Frequency related coefficient：If RString-intermediate frequency>=1, then winding of connecting is normal；Otherwise series connection winding, which exists, turns round Bent or bulge failure, winding Mid Frequency Fault characteristic parameters of further relatively connecting：If τTotal string-intermediate frequency≤ L1, then winding is slight Failure；If L1<τTotal string-intermediate frequency≤ L2, then winding is moderate failure；If τTotal string-intermediate frequency> L2, then winding is severe failure；
If there is distortion or bulge failure in 4.4 series connection windings, further measurement series connection winding-to-earth capacity, if direct-to-ground capacitance becomes Then there is distortion or bulge close to the series connection winding of iron core, if direct-to-ground capacitance change rate in rate >=5%<5%, then close to fuel tank Series connection winding exist distortion or bulge；
5) judged according to high band related coefficient and Fault characteristic parameters, it is as follows：
5.1 compare public winding and series connection winding high band related coefficient：If RPublic string-high frequency>=0.6 normal, otherwise there is whole move Public winding and series connection winding high band Fault characteristic parameters are further compared in position：If τTotal public affairs string-high frequency≤ L1, then winding is light Spend failure；If L1<τTotal public affairs string-high frequency≤ L2, then winding is moderate failure；If τTotal public affairs string-high frequency> L2, then winding is severe failure；
5.2 compare public winding high band related coefficient：
If 5.2.1 RPublic affairs-high frequency>=0.6, then public winding is normal, series connection winding there are integral shift failure, further relatively series connection around Group high band Fault characteristic parameters：If τTotal string-high frequency≤ L1, then winding is minor failure；If L1<τTotal string-high frequency≤ L2, then winding For moderate failure；If τTotal string-high frequency> L2, then winding is severe failure；
If 5.2.2 RPublic affairs-intermediate frequency<0.6, then there are integral shift failures for public winding, and further relatively the segment fault of public winding high frequency is special Levy parameter：If τTotal public affairs-high frequency≤ L1, then winding is minor failure；If L1<τTotal public affairs-high frequency≤ L2, then winding is moderate failure；If τTotal public affairs-high frequency> L2, then winding is severe failure；
5.3 compare series connection winding high band related coefficient：If RString-high frequency>=0.6, then winding of connecting is normal；Otherwise series connection winding exists Integral shift failure, winding high band Fault characteristic parameters of further relatively connecting：If τTotal string-high frequency≤ L1, then winding is slight Failure；If L1<τTotal string-high frequency≤ L2, then winding is moderate failure；If τTotal string-high frequency> L2, then winding is severe failure；
If there are integral shifts for 5.4 series connection windings, series connection winding-to-earth capacity is further measured, if direct-to-ground capacitance change rate >= 5%, then it is assumed that there is integral shift certainly close to iron core series connection winding, if direct-to-ground capacitance change rate<5%, then it is assumed that only lean on There are integral shifts for the series connection winding of nearly fuel tank.
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