CN108956697B - The evaluating method of large-scale wound core transformer coil winding effect - Google Patents

The evaluating method of large-scale wound core transformer coil winding effect Download PDF

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CN108956697B
CN108956697B CN201810285183.4A CN201810285183A CN108956697B CN 108956697 B CN108956697 B CN 108956697B CN 201810285183 A CN201810285183 A CN 201810285183A CN 108956697 B CN108956697 B CN 108956697B
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coil
frequency range
frequency
normal
sequence
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CN108956697A (en
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吴振宇
周利军
郭蕾
江俊飞
李威
高仕斌
严静荷
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Southwest Jiaotong University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/72—Testing of electric windings

Abstract

The invention discloses the evaluating methods of large-scale wound core transformer coil winding effect.Step is implemented as coiling high and low pressure coil first and test wiring, frequency response test is then carried out, then carries out feature information extraction, finally carry out parameter comparison and judge.The closed single frame rewinding material coil winding process of large size provided through the invention, can be improved the reliability of coil, transformer safety hidden danger caused by reducing because of coil winding problem.

Description

The evaluating method of large-scale wound core transformer coil winding effect
Technical field
The invention belongs to large-scale Wound iron-core transformer production technology fields, and in particular to large-scale Wound iron-core transformer coil around The evaluating method of effect processed.
Background technique
AT power supply mode is the power supply mode being most widely used at present, especially in high-speed railway.Transformer conduct Its important component plays important role, Wound iron-core transformer no-load loss, volume, in terms of have folded iron The advantage that heart transformer does not have can bring huge energy-saving benefit for entire tractive power supply system, and large size rewinding material becomes at present Depressor is in tractive power supply system application.
It is known that one of the key factor for influencing large-scale Wound iron-core transformer batch production is exactly coil winding, Er Qie great The closed rewinding material of type single frame is in winding process, it is necessary to coiling is directly carried out on core limb rather than the later period assembling when It waits and carries out whole splicing and installation.In order to guarantee reliability of the coil in winding process, after coil winding completion, and The detection of Shi Jinhang mass and defect diagonsis, if coil winding is unqualified, it is difficult to directly be replaced, in order to guarantee coil winding Reliability in the process must be detected and be verified when coil is completed, and occasionally there are be difficult to check the defect of some inherences The case where, there are security risks when leading to transformer final application.Frequency response method is due to its higher precision and resists dry Disturb ability, the detection of transformer coil defect on site be widely applied, can be used for the closed rewinding material coil of large-scale single frame around The detection of coil state during system, but its due to evaluation coefficient it is more single, diagnostic system also needs further to further investigate, because This is badly in need of a kind of fabrication evaluation method that is more reliable, effectively aiming at the closed rewinding material coil coiling of large-scale single frame.
Summary of the invention
In view of the deficiency of the above technology, in order to relatively reliable, effectively enterprising in the closed rewinding material of large-scale single frame Row coil winding, the present invention provide a kind of whole evaluating method of large-scale wound core transformer coil winding effect, and core is By the detection and exclusion that carry out defect after coil winding terminates.
Realize the technical solution of the object of the invention are as follows:
The evaluating method of large-scale wound core transformer coil winding effect, comprising:
Step 11: the first low-voltage coil of coiling on large-scale the first stem of single frame rewinding material, coiling on the second stem Two low-voltage coils；
Step 12: frequency response test being carried out to the first low-voltage coil on the first stem with frequency response tester, is tested Frequency range is 1kHz-1MHz, is evenly distributed sequence X1(f)；With frequency response tester to the second low-voltage line on the second stem Circle carries out frequency response test, and test frequency range is 1kHz-1MHz, is evenly distributed sequence X2(f)；
Step 13: sequence X will be uniformly distributed1(f) and X2(f) curve and segment are depicted as under same coordinate, wherein being divided into Three frequency ranges, respectively LF, HF and HF；The frequency of described LF, MF and HF be respectively 1kHz-100kHz, 100kHz-600kHz and 600kHz-1MHz；
Calculate separately characteristic parameter for three frequency ranges: amplitude is very poor to compare σ1With equivalent defect area ratio σ2, it is as follows:
N is two curve X1(f) and X2(f) the specific step-length number that the shadow region surrounded is included；
It is uniformly distributed sequence X1(f) and X2It (f) is the corresponding sequence of frequency response curve, the independent variable of frequency response curve For the frequency point sequence f of 1kHz-1MHzi；
fiFor i=1,2,3,4 ... sequence X is uniformly distributed when n-11(f)、X2(f) corresponding frequency point sequence；
Step 14: carrying out defects detection；Such as coil existing defects, then the coiling again and detection of coil are carried out, until line Circle is normal；
Step 15: the coiling and inspection of the first high-tension coil and the second high-tension coil are carried out according to the method for step 11 to 14 It surveys, until coil is normal；
Step 16: by the first low-voltage coil and the first high-tension coil concatenation, the second low-voltage coil and the second high-tension coil string It connects, and is detected according to the method for step 12 to 14, until coil is normal；
The defects detection, comprising:
Step 21:
In LF frequency range, such as σ1∈ [0,15%] then determines: coil is normal in the frequency range；
In MF frequency range, such as σ1∈ [0,15%] then determines: coil is normal in the frequency range；
In HF frequency range, such as σ1∈ [0,20%] then determines: coil is normal in the frequency range；
When coil is normal in all frequency ranges, then coil is normal；Otherwise, coil existing defects；
Step 22: such as coil existing defects, then continue the judgement of fault type:
In LF frequency range, such as σ2Then coil is normal in this frequency range by ∈ [0,45%], and carries out the judgement of next frequency range；Otherwise It is determined as short trouble between coil turn-to-turn or cake；
In MF frequency range, such as σ2Then coil is normal in this frequency range by ∈ [0,45%], and carries out the judgement of next frequency range；Otherwise It is determined as twist coil and bulge failure；
In HF frequency range, such as σ2Then coil is normal in this frequency range by ∈ [0,60%]；Otherwise be determined as coil integral shift or Lead is displaced failure.
The closed rewinding material coil winding method of large-scale single frame proposed by the invention carries out line using frequency response method It encloses defect to exclude, effectively can accurately identify coil defect that may be present after coiling completion, can effectively mention Rise the reliability of the closed rewinding material coil winding of large-scale single frame.
Detailed description of the invention
Fig. 1 is the process method flow chart of the closed rewinding material coil coiling of large size provided by the invention.
Fig. 2 is that normal and defect situation lower frequency response curve segment draws schematic diagram.
Fig. 3 is that defect excludes flow diagram.
Specific embodiment
Details of the invention is described in further detail with reference to the accompanying drawing:
A kind of assessment method of large-scale wound core transformer coil winding effect as shown in Figure 1 comprising the steps of:
Step 1: to coiling low-voltage coil 1 on large-scale single frame rewinding material stem 1, after coiling is complete on stem 2 coiling low pressure Coil 2；
Step 2: frequency response test (frequency range 1kHz-1MHz) being carried out to 1 coil 1 of stem, is evenly distributed sequence 1 (X of column1(f)) frequency response test (frequency range 1kHz-1MHz), is carried out to 2 coil 2 of stem, is evenly distributed sequence 2 (X2(f)) guarantee reliable contact in test process, to reduce the interference in test process；
Step 3: the sequence tested in step 2 being depicted as curve and segment under same coordinate, is compared if it exists Apparent defect, then part can draw out apparent segment between curve, as shown in Figure 2.The sequence that will be tested in step 2 It is listed under same coordinate and is depicted as curve and segment, wherein it is divided into three frequency ranges, respectively LF (1kHz-100kHz), MF (100kHz-600kHz), HF (600kHz-1MHz) calculates separately parameter for three frequency ranges: the poor (σ of maximum amplitude1), defect Equivalent area ratio (σ2), circular is as follows:
fiIt indicates are as follows: meet the frequency point sequence of condition in corresponding frequency range；
N is two curve X1(f) and X2(f) the specific step-length number that the shadow region surrounded is included.
Step 4: if defect excludes shown in flow diagram in Fig. 3, parameter comparison judgement includes following step:
Step 41: since low-frequency range (1kHz-100kHz), measuring (σ respectively from basic, normal, high three frequency ranges1)；
In LF frequency range, σ1∈ [0,15%] preliminary judgement: transformer belongs to normal condition in the frequency range；
In MF frequency range, σ1∈ [0,15%] preliminary judgement: transformer belongs to normal condition in the frequency range；
In HF frequency range, σ1∈ [0,20%] preliminary judgement: transformer belongs to normal condition in the frequency range；
Work as σ1It is more than threshold range in some frequency range, it is believed that coil existing defects；
Step 42: as the very poor (σ of amplitude1) parameter calculation shows that transformer in certain frequency range existing defects, in the frequency range Continue to calculate perimeter area ratio (σ2) and defect equivalent area ratio (σ3)；
In LF frequency range, σ2∈ [0,45%] determines that the frequency range is normal, and carries out the assessment of next frequency range, otherwise recognizes Are as follows: there are failures short-circuit between coil turn-to-turn or cake；
In MF frequency range, σ2∈ [0,45%] determines that the frequency range is normal, and carries out the assessment of next frequency range, otherwise recognizes Are as follows: there are the local deformations phenomenons such as twist coil and bulge；
In HF frequency range, σ2∈ [0,60%] determines that the frequency range is normal, otherwise it is assumed that: there are coil integral shift or Lead offset phenomena；
Step 43: when transformer judges by step 41 and step 42, carried out when being in defect state defect investigation and Detection after searching and having solved defect, then reenters step 1, and 2,3,4 continue to judge until detection is qualified.
The closed rewinding material coil winding method of large-scale single frame proposed by the invention carries out line using frequency response method It encloses defect to exclude, effectively can accurately identify coil defect that may be present in winding process, can effectively be promoted The reliability of the large-scale closed rewinding material coil winding of single frame, there are security risks when transformer assembling being avoided to dispatch from the factory.

Claims (1)

1. the evaluating method of large-scale wound core transformer coil winding effect characterized by comprising
Step 11: the first low-voltage coil of coiling on large-scale the first stem of single frame rewinding material, coiling second is low on the second stem Crimping circle；
Step 12: frequency response test being carried out to the first low-voltage coil on the first stem with frequency response tester, tests frequency range For 1kHz-1MHz, it is evenly distributed sequence X1(f)；With frequency response tester to the second low-voltage coil on the second stem into Line frequency response test, test frequency range are 1kHz-1MHz, are evenly distributed sequence X2(f)；
Step 13: sequence X will be uniformly distributed1(f) and X2(f) curve and segment are depicted as under same coordinate, wherein being divided into three Frequency range, respectively LF, HF and HF；The frequency of described LF, MF and HF be respectively 1kHz-100kHz, 100kHz-600kHz and 600kHz-1MHz；
Calculate separately characteristic parameter for three frequency ranges: amplitude is very poor to compare σ1With equivalent defect area ratio σ2, it is as follows:
N is two curve X1(f) and X2(f) the specific step-length number that the shadow region surrounded is included；
It is uniformly distributed sequence X1(f) and X2It (f) is the corresponding sequence of frequency response curve, the independent variable of frequency response curve is The frequency point sequence f of 1kHz-1MHzi；
fiFor i=1,2,3,4 ... sequence X is uniformly distributed when n-11(f)、X2(f) corresponding frequency point sequence；
Step 14: carrying out defects detection；Such as coil existing defects, then carry out the coiling again and detection of coil, until coil just Often；
Step 15: the coiling and detection of the first high-tension coil and the second high-tension coil are carried out according to the method for step 11 to 14, directly It is normal to coil；
Step 16: the first low-voltage coil and the first high-tension coil concatenation, the second low-voltage coil and the second high-tension coil are concatenated, and It is detected according to the method for step 12 to 14, until coil is normal；
The defects detection, comprising:
Step 21:
In LF frequency range, such as σ1∈ [0,15%] then determines: coil is normal in the frequency range；
In MF frequency range, such as σ1∈ [0,15%] then determines: coil is normal in the frequency range；
In HF frequency range, such as σ1∈ [0,20%] then determines: coil is normal in the frequency range；
When coil is normal in all frequency ranges, then coil is normal；Otherwise, coil existing defects；
Step 22: such as coil existing defects, then continue the judgement of fault type:
In LF frequency range, such as σ2Then coil is normal in this frequency range by ∈ [0,45%], and carries out the judgement of next frequency range；Otherwise determine The short trouble between coil turn-to-turn or cake；
In MF frequency range, such as σ2Then coil is normal in this frequency range by ∈ [0,45%], and carries out the judgement of next frequency range；Otherwise determine For twist coil and bulge failure；
In HF frequency range, such as σ2Then coil is normal in this frequency range by ∈ [0,60%]；Otherwise it is determined as coil integral shift or lead position Move failure.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101701995A (en) * 2009-11-12 2010-05-05 重庆大学 Impulse response analytical test apparatus and method for detecting deformation of transformer winding
WO2014015357A1 (en) * 2012-07-23 2014-01-30 Curtin University Of Technology A method of determining a characteristic of a power transformer and a system therefor
CN103884943A (en) * 2014-04-02 2014-06-25 国家电网公司 Method for comprehensively analyzing and diagnosing deformation of winding of transformer
CN106646098A (en) * 2016-12-31 2017-05-10 西南交通大学 Winding frequency response testing platform and method under short circuit fault between cores

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101701995A (en) * 2009-11-12 2010-05-05 重庆大学 Impulse response analytical test apparatus and method for detecting deformation of transformer winding
WO2014015357A1 (en) * 2012-07-23 2014-01-30 Curtin University Of Technology A method of determining a characteristic of a power transformer and a system therefor
CN103884943A (en) * 2014-04-02 2014-06-25 国家电网公司 Method for comprehensively analyzing and diagnosing deformation of winding of transformer
CN106646098A (en) * 2016-12-31 2017-05-10 西南交通大学 Winding frequency response testing platform and method under short circuit fault between cores

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
基于频率响应法的变压器故障检测仿真;王振宇等;《绝缘材料》;20171231;第69-73页

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