CN109444775A - A kind of transformer core remanent magnetism evaluation method based on Magnetic Flux Leakage Inspecting - Google Patents
A kind of transformer core remanent magnetism evaluation method based on Magnetic Flux Leakage Inspecting Download PDFInfo
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- CN109444775A CN109444775A CN201811271089.XA CN201811271089A CN109444775A CN 109444775 A CN109444775 A CN 109444775A CN 201811271089 A CN201811271089 A CN 201811271089A CN 109444775 A CN109444775 A CN 109444775A
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- magnetic flux
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- remanent magnetism
- flux leakage
- leakage inspecting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
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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
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
Abstract
The invention discloses a kind of transformer core remanent magnetism evaluation method based on Magnetic Flux Leakage Inspecting, specific steps include: to be configured to the placement location of Magnetic Flux Leakage Inspecting element (1), the leakage field value of acquisition transformer core (2) nearby；According to the leakage field value of corresponding detecting element (1) set-down location of remanent magnetism situations different in the transformer core (2) obtained by finite element method for simulating, the mathematic(al) representation of leakage field and remanent magnetism is fitted；The collected leakage field value of Magnetic Flux Leakage Inspecting element is substituted into mathematic(al) representation, estimates the residual induction in transformer core (2).The present invention provides a kind of quick and lossless schemes for obtaining transformer core remanent magnetism numerical value, the transformer suitable for different core structures.
Description
Technical field
The present invention relates to a kind of transformer core remanent magnetism evaluation method more particularly to a kind of transformers based on Magnetic Flux Leakage Inspecting
Iron core remanent magnetism evaluation method.
Background technique
Remanent magnetism in transformer core can form magnetic flux leakage around iron core, and remanent magnetism is bigger, and corresponding leakage field also can be bigger.
Hall sensor is one kind based on magneto-dependent sensor made of Hall effect, magnetic field signal can be converted to electric signal, when sharp
Given value of current is encouraged, the Hall voltage of Hall sensor output is directly proportional to magnetic induction intensity.Discrete Hall element can detect 10-8T
The low-intensity magnetic field of intensity, and the linearity is preferable.Hall sensor is placed in the stronger position of Magnetic Leakage Field of Transformer, sensor output
Electric signal is input to converter after amplifier amplifies, and the measurement to Magnetic Leakage Field of Transformer can be realized.
The degree that the size of transformer core remanent magnetism is saturated magnetic circuit after transformer during no-load closing seriously affects.It obtains at present
The method for taking transformer core remanent magnetism is broadly divided into three categories: rule of thumb to remanent magnetism value；It magnetizes to transformer and obtains target
Residual induction；Residual induction is asked to winding voltage integral.Empirical method and the method that magnetizes can not all know accurately initial remanent magnetism situation, magnetize
Method also needs to introduce external drive electric current, there is impact to power transformer or even whole system.Voltage integration has ignored surplus
The influence for situations such as magnetic fails, resultant error are big.As it can be seen that the remanent magnetism of transformer is difficult to directly accurate measurement, there is presently no one
The mature efficient pressure swing device iron core remanent magnetism value acquisition method of kind.
Summary of the invention
Goal of the invention: aiming at the above problems existing in the prior art, the present invention provides a kind of change based on Magnetic Flux Leakage Inspecting
Depressor iron core remanent magnetism evaluation method, to solve the problems, such as that transformer core remanent magnetism is difficult to quick and precisely measure.
Technical solution: the transformer core remanent magnetism evaluation method of the invention based on Magnetic Flux Leakage Inspecting includes the following steps: S1:
Magnetic Flux Leakage Inspecting element is placed on transformer fe wicking surface magnetic leakage signal most strength；S2: pass through the Magnetic Flux Leakage Inspecting element placed
Acquire the leakage field value of Magnetic Flux Leakage Inspecting element set-down location in the case of different remanent magnetism in transformer core；S3: it is based on finite element method mould
Intend the leakage field value of detecting element set-down location in the case of different remanent magnetism in the transformer core, fitting obtains the number of leakage field and remanent magnetism
Learn expression formula；S4: the collected leakage field value of Magnetic Flux Leakage Inspecting element will be used for and substitute into mathematic(al) representation, calculated in transformer core
Residual induction.
Further, the Magnetic Flux Leakage Inspecting element is Magnetic Sensor.
Further, the Magnetic Flux Leakage Inspecting element is line style Hall sensor.
Further, when transformer is single-phase transformer, the number of Magnetic Flux Leakage Inspecting element is one and is placed on iron core
The inside intersection of column and iron yoke；When transformer is three-phase transformer group, the number of Magnetic Flux Leakage Inspecting element is three and difference
It is placed on the inside intersection of each phase iron core column and iron yoke；When transformer is three-phase three-limb transformer, Magnetic Flux Leakage Inspecting member
The number of part is two and is symmetrically disposed at the inside intersection of left and right two-phase iron core column and iron yoke.
Further, in step s3, the mathematic(al) representation of leakage field and remanent magnetism, by finite element method for simulating transformer core
In with different remanent magnetism when Magnetic Flux Leakage Inspecting element present position leakage field value be fitted to obtain.
Further, in step s 4, when transformer is three-phase three-limb transformer, by left and right sides Magnetic Flux Leakage Inspecting value
The mathematic(al) representation for substituting into fitting respectively obtains the residual induction in the two-phase iron core column of left and right, is zero according to the sum of three-phase remanent magnetism, meter
Calculate the residual induction of interphase iron core column.
The utility model has the advantages that compared with prior art, the present invention being suitable for single-phase transformer, three-phase transformer group and three-phase three-column
The transformer of the difference core structure such as formula transformer, principle is simple, easy to implement, does not break to transformer itself and electric system
Bad and interference, can fast and accurately know transformer core remanent magnetism numerical value.
Detailed description of the invention
Fig. 1 is single-phase transformer Magnetic Flux Leakage Inspecting schematic diagram of the present invention；
Fig. 2 is three-phase transformer group Magnetic Flux Leakage Inspecting schematic diagram of the present invention；
Fig. 3 is three-phase three-limb stray transformer flux detection schematic diagram of the present invention；
In figure: 1 indicates Magnetic Flux Leakage Inspecting element, 2 indication transformer iron cores, 3 indication transformer windings, BrFor single-phase transformer
Iron core remanent magnetism, BrA、BrBAnd BrCRespectively three-phase transformer A, B, C phase iron core remanent magnetism.
Specific embodiment
Below in conjunction with attached drawing, the present invention is described in detail.
Transformer core remanent magnetism evaluation method of the invention the following steps are included:
S1: Magnetic Flux Leakage Inspecting element 1 is placed in place
Under normal circumstances, Magnetic Flux Leakage Inspecting element 1 is placed on the 2 strongest place of surface leakage field of transformer core.Referring to figure
1, the number of the Magnetic Flux Leakage Inspecting element 1 of single-phase transformer 100 is one, is placed on the inside intersection of iron core column and iron yoke.Ginseng
According to Fig. 2, the number of the Magnetic Flux Leakage Inspecting element 1 of three-phase transformer group 200 is three, is individually positioned in each phase iron core column and iron yoke
Inside intersection.Referring to Fig. 3, the number of the Magnetic Flux Leakage Inspecting element 1 of three-phase three-limb transformer 300 is two, symmetrically placed
The inside intersection of two-phase iron core column and iron yoke in left and right.Preferably, above-mentioned Magnetic Flux Leakage Inspecting element 1 is linear hall sensor.
S2: the magnetic leakage signal in the case of different remanent magnetism near transformer core 2 is acquired.
S3: using 1 present position of Magnetic Flux Leakage Inspecting element in the case of remanent magnetism different in finite element method for simulating transformer core 2
Leakage field value, fitting obtain the mathematic(al) representation of leakage field and remanent magnetism.
Specifically, such as Fig. 1, for single-phase transformer 100, since Magnetic Flux Leakage Inspecting element 1 is disposed close to left side iron core table
At the position of face, according to residual induction B different in transformer core 2rIn the case of 1 present position of Magnetic Flux Leakage Inspecting element leakage field value Bσ, intend
Conjunction obtains mathematic(al) representation:
Br=kBσ
Wherein, k is fitting coefficient.Since the magnitude of remanent magnetism and leakage field intensity differs larger, remanent magnetism in data fit procedure
The unit of magnetic induction intensity is mT, and the unit of leakage field magnetic induction intensity is μ T.
For three-phase transformer group 200, by the way of similar with single-phase transformer 100, each phase of A, B, C is fitted respectively
The mathematic(al) representation of corresponding leakage field and remanent magnetism.
For three-phase three-limb transformer 300, by the way of similar with single-phase transformer 100, the left and right sides is fitted
The mathematic(al) representation of (i.e. A phase and C phase) corresponding leakage field and remanent magnetism.Left and right sides Magnetic Flux Leakage Inspecting value is substituted into the number of fitting respectively
Expression formula is learned, the residual induction in the two-phase iron core column of left and right is obtained, is zero according to the sum of three-phase remanent magnetism, calculate interphase iron core column
Residual induction.Particularly, since transformer iron-core structure is symmetrical, and the placement location pair of the Magnetic Flux Leakage Inspecting element 1 of the left and right sides
Claim, the quantitative relation of residual induction can be described with the same mathematic(al) representation in the leakage field value and corresponding iron core column of the left and right sides.
S4: the collected leakage field value of Magnetic Flux Leakage Inspecting element 1 will be used for and substitute into the mathematic(al) representation being fitted, calculate transformer
Residual induction in iron core 2.
Below by taking the 10/0.4kV three-phase three-limb transformer using B27G120 model silicon steel sheet as an example, to based on leakage field
The transformer core remanent magnetism evaluation method of detection is specifically described.First, in accordance with shown in Fig. 3, the leakage of the symmetrically placed left and right sides
Magnetic detecting element 1.To the leakage field value B of 1 present position of left side Magnetic Flux Leakage Inspecting elementσ1And the remanent magnetism B in the iron core column of left siderAIt carries out
Linear fit, since the magnitude of remanent magnetism and leakage field intensity differs larger, the unit of remanent magnetism magnetic induction intensity in data fit procedure
Unit for mT, leakage field magnetic induction intensity is μ T, obtains mathematic(al) representation:
BrA=kABσ1
In formula, kAFor the corresponding fitting coefficient of A.
For C phase, there is BrC=kCBσ1, and kA=kC.Left and right sides Analysis of Magnetic Flux Leakage Testing Signals is substituted into the mathematics respectively
Expression formula obtains the residual induction in three-phase three-limb transformer or so two-phase (i.e. A phase and C phase) iron core column, according to three-phase remanent magnetism
The sum of be zero, calculate the residual induction of interphase iron core column (corresponding B phase).Table 1 illustrates three-phase three-column in the case of different remanent magnetism
Practical remanent magnetism and the comparison for estimating residual induction in each phase iron core in formula transformer.In order to preferably observe fitting result, to each
Phase remanent magnetism fitting result seeks error rate, and the maximum value of three-phase error rate is taken to be included in table 1.
Table 1
As shown in Table 1, the three-phase remanent magnetism estimated value error rate obtained by linear fit method is no more than 5%, has higher
Accuracy rate.
The present invention is suitable for the different core structures such as single-phase transformer, three-phase transformer group and three-phase three-limb transformer
Transformer, principle is simple, easy to implement, and transformer itself and electric system are not destroyed and interfered, can be rapidly and accurately
Know transformer core remanent magnetism numerical value.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of transformer core remanent magnetism evaluation method based on Magnetic Flux Leakage Inspecting, which is characterized in that this method comprises the following steps:
S1: Magnetic Flux Leakage Inspecting element (1) is placed on transformer core (2) surface magnetic leakage signal most strength；
S2: the leakage field of transformer core (2) nearby in the case of different remanent magnetism is acquired by the Magnetic Flux Leakage Inspecting element (1) that places
Value；
S3: locating based on Magnetic Flux Leakage Inspecting element (1) in the case of different remanent magnetism in the finite element method calculating transformer core (2)
The leakage field value of position, fitting obtain the mathematic(al) representation of leakage field and remanent magnetism；
S3: the leakage field value that Magnetic Flux Leakage Inspecting element (1) is detected substitutes into mathematic(al) representation, calculates in transformer core (2)
Residual induction.
2. the transformer core remanent magnetism evaluation method according to claim 1 based on Magnetic Flux Leakage Inspecting, which is characterized in that described
Magnetic Flux Leakage Inspecting element (1) be Magnetic Sensor.
3. the transformer core remanent magnetism evaluation method according to claim 2 based on Magnetic Flux Leakage Inspecting, which is characterized in that described
Magnetic Flux Leakage Inspecting element (1) be line style Hall sensor.
4. the transformer core remanent magnetism evaluation method according to claim 1 based on Magnetic Flux Leakage Inspecting, which is characterized in that work as change
When depressor is single-phase transformer (100), the number of Magnetic Flux Leakage Inspecting element (1) is one and is placed on the inside of iron core column and iron yoke
Intersection；When transformer is three-phase transformer group (200), the number of Magnetic Flux Leakage Inspecting element (1) is three and is individually positioned in
The inside intersection of each phase iron core column and iron yoke；When transformer is three-phase three-limb transformer (300), Magnetic Flux Leakage Inspecting element
(1) number is two and is symmetrically disposed at the inside intersection of left and right two-phase iron core column and iron yoke.
5. the transformer core remanent magnetism evaluation method according to claim 1 based on Magnetic Flux Leakage Inspecting, which is characterized in that in step
In rapid S3, leakage field is leaked when different remanent magnetism from the mathematic(al) representation of remanent magnetism by having in finite element method for simulating transformer core (2)
The leakage field value of magnetic detecting element (1) present position is fitted to obtain.
6. the transformer core remanent magnetism evaluation method according to claim 1 based on Magnetic Flux Leakage Inspecting, which is characterized in that in step
In rapid S4, when transformer is three-phase three-limb transformer (300), by the left and right sides Magnetic Flux Leakage Inspecting element (1) collected leakage
Magnetic value substitutes into the mathematic(al) representation of fitting respectively, obtains the residual induction in the two-phase iron core column of left and right, is according to the sum of three-phase remanent magnetism
Zero, calculate the residual induction of interphase iron core column.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568302A (en) * | 2019-09-16 | 2019-12-13 | 杭州电力设备制造有限公司 | Transformer turn-to-turn fault detection method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006337039A (en) * | 2005-05-31 | 2006-12-14 | Uchihashi Estec Co Ltd | Defect-detecting method of metal body, and scanning type magnetic detector |
| CN106371044A (en) * | 2016-08-22 | 2017-02-01 | 卢庆港 | Magnetic flux leakage based case inside iron core working state monitoring method |
| KR101753285B1 (en) * | 2016-04-22 | 2017-07-05 | 한국수자원공사 | Cleaning and Damage Monitering Method of Wire Rope of Moving Type with Scraper and Hot Air |
-
2018
- 2018-10-29 CN CN201811271089.XA patent/CN109444775B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006337039A (en) * | 2005-05-31 | 2006-12-14 | Uchihashi Estec Co Ltd | Defect-detecting method of metal body, and scanning type magnetic detector |
| KR101753285B1 (en) * | 2016-04-22 | 2017-07-05 | 한국수자원공사 | Cleaning and Damage Monitering Method of Wire Rope of Moving Type with Scraper and Hot Air |
| CN106371044A (en) * | 2016-08-22 | 2017-02-01 | 卢庆港 | Magnetic flux leakage based case inside iron core working state monitoring method |
Non-Patent Citations (4)
| Title |
|---|
| DIDIER CAVALLERA: "A New Method to Evaluate Residual Flux Thanks to Leakage Flux, Application to a Transformer", 《 IEEE TRANSACTIONS ON MAGNETICS》 * |
| S.S. UDPA: "Alternative demagnetization curve representations for the finite element modeling of residual magnetism", 《 IEEE TRANSACTIONS ON MAGNETICS 》 * |
| 李景丽: "电力变压器铁心剩磁测量方法研究综述", 《高压电器》 * |
| 毕艳军: "变压器漏感的有限元计算", 《实验室研究与探索》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568302A (en) * | 2019-09-16 | 2019-12-13 | 杭州电力设备制造有限公司 | Transformer turn-to-turn fault detection method and device |
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