CN110456290A - A kind of shearing transformer is lost with silicon steel sheet the evaluation method of influence - Google Patents
A kind of shearing transformer is lost with silicon steel sheet the evaluation method of influence Download PDFInfo
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- CN110456290A CN110456290A CN201910763500.3A CN201910763500A CN110456290A CN 110456290 A CN110456290 A CN 110456290A CN 201910763500 A CN201910763500 A CN 201910763500A CN 110456290 A CN110456290 A CN 110456290A
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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
- G01R33/123—Measuring loss due to hysteresis
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Abstract
The present invention relates to technical field of electromagnetic measurement more particularly to a kind of shearing, and the evaluation method influenced to be lost with silicon steel sheet on transformer.The evaluation method influenced is lost shearing of the invention with silicon steel sheet on transformer, under the premise of only considering that slitting generates stress influence to silicon steel sheet, measures the slitting specific loss P of silicon steel sheetL0, then will by slitting and the horizontal silicon steel sheet stack cut at square circle, measure silicon steel sheet by slitting and it is horizontal cut after total losses PC, then by slitting specific loss PL0From total losses PCIn separate, calculate that silicon steel sheet is horizontal cuts specific loss PC0, utilize silicon-steel sheet longitudinal-shearing specific loss PL0Specific loss P is cut with horizontalC0With the specific loss P measured according to national standard0Ratio evaluation silicon steel sheet performance.Slitting and the horizontal influence cut to silicon steel sheet loss can be considered simultaneously using the evaluation method of transformer silicon steel sheet drain performance of the invention.
Description
Technical field
The present invention relates to technical field of electromagnetic measurement more particularly to a kind of shearing, and shadow is lost to transformer silicon steel sheet
Loud evaluation method.
Background technique
As countries in the world are higher and higher to energy-saving and emission-reduction requirement, energy-saving distribution transformer has become network distribution transformer
New demand, in order to manufacture the lower distribution transformer of no-load loss, for manufacturing the silicon steel of energy-saving distribution transformer cores
The trade mark grade of piece is also stepping up, the thickness of high grade silicon steel piece usually within the scope of 0.18mm~0.23mm, relative to
The biggish power transformer of capacity, distribution transformer size is small, is affected by processing technology, and silicon steel sheet is influenced performance by processing
Change bigger.Therefore, the cutting performance for evaluating silicon steel sheet is very necessary to energy-economic transformer is manufactured and designed.
Currently, generalling use square circle method or both sides both at home and abroad encloses the specific loss of method measurement silicon steel sheet to evaluate silicon steel sheet, than
Such as application number: 201120553702.4 disclose a kind of electrical sheet total Loss Ratio measurement system based on double epstein frames
System solves existing epstein frame measurement equivalent magnetic circuit and is difficult to what determination impacted sample total Loss Ratio measurement
Problem.For another example application number: 201210578143.1 disclose the model of silicon steel piece performance and side on a kind of measuring transformer product
Method, this method use the air core coil structure of similar epstein frame formula, silicon steel sheet are filled, to the silicon steel of different stack forms
Piece performance measures, with two length of magnetic path differences, model of same size, complete various Test Cycle diagonal sections overlap joints,
The size of stepping overlap joint or butt-welded side seam influence degree.For another example application number: 201310072379.2 disclose and a kind of use three kinds
The square circle model of size carries out the overall loss measurement of same group of tested electrical sheet sample, realizes ratio using second level weighted mean method
The method of the calculating of total losses.Above method does not account for slitting line and cut-to-length shearing silicon steel sheet in transformer manufacturing process
When give silicon steel sheet bring stress influence.
In addition, in silicon steel sheet magnetic property fields of measurement, epstein frame method is the measurement method of comparative maturity, but square circle
Sample is made of plate shearing machine, and specimen size is limited in 30mm wide, cannot reflect slitting line and cross during transformer manufacturing
Silicon steel sheet bring stress influence is given when trimming shearing silicon steel sheet, makes two of same size, 45 ° of different mitre sides of length
Circle measurement silicon steel sheet specific loss, the process for making test item is complicated, and in order to reduce measurement error, needs to guarantee two square circles
The performance of seam crossing is completely the same in manufacturing process, it is more difficult to realize.
Summary of the invention
In order to solve problem above, the object of the present invention is to provide a kind of shearings is lost shadow to transformer silicon steel sheet
Loud evaluation method can consider slitting and the horizontal influence cut to silicon steel sheet loss using evaluation method of the invention simultaneously.
To achieve the above object, a kind of shearing designed by the present invention is commented what the loss of transformer silicon steel sheet influenced
Valence method, which is characterized in that by the slitting specific loss coefficient and the horizontal specific loss factor evaluation silicon steel sheet cut that calculate silicon steel sheet
Drain performance specifically includes step:
(1) silicon steel sheet is handled by slitting, the slitting specific loss P of silicon steel sheet after measurement slitting processingL0；
(2) steel disc is then cut into processing by horizontal, measure slitting and it is horizontal cut handle after silicon steel sheet total losses PC；
(3) specific loss P is cut by the way that formula (3) calculating is horizontalC0
PC0--- the horizontal of silicon steel sheet cuts specific loss, W/kg
PC--- the total losses of silicon steel sheet, W
mL--- square circle column is improved quality, kg
mac--- square circle angle weight, kg
(4) according to national standard " method that GB/T 3655-2008 measures electrical sheet (band) magnetic property with epstein frame "
The loss or " method that GB/T 13789-2008 measures electrical sheet (band) magnetic property with single chip tester " of silicon steel sheet are measured,
Obtain the standard specific loss P of silicon steel sheet0；
(5) silicon-steel sheet longitudinal-shearing specific loss PL0With standard specific loss P0Ratio obtain slitting specific loss coefficient, silicon steel sheet is horizontal
Cut specific loss PC0With standard specific loss P0Ratio obtain it is horizontal cut specific loss coefficient, evaluated according to coefficient magnitude silicon steel sheet loss
Performance.
Preferably, slitting specific loss P in the step (1)L0Specific measurement process are as follows: be according to length-width ratio
10:1 slitting silicon steel band weighs the gross mass m of silicon steel sheet, and m is greater than 5kg, by silicon steel sheet width and square circle geometric center
Line ratio is the double overlap joints of 3% progress；Then by interim excitation winding uniform winding on four sides of square circle, then will it is interim it is secondary around
For group uniform winding on four sides of square circle, interim excitation winding is identical as the position holding of secondary winding, utilizes power meter measures
P is lost in the slitting of square circleL, the slitting specific loss P of sample is calculated according to formula (1) and formula (2)L0；
ma--- the effective mass of silicon steel sheet, kg
The gross mass of m --- silicon steel sheet, kg
L --- silicon steel sheet patch lengths, m
lm--- length of magnetic path coefficient, 0.94
lc--- square circle geometric center line length, m
PL0--- the slitting specific loss of silicon steel sheet, W/kg
PL--- the slitting of silicon steel sheet is lost, W.
Preferably, total losses P in the step (2)CSpecific measurement process are as follows: using being set with power transformer product
Identical type is counted, silicon steel sheet is overlapped to form iron core by the bridging arrangement that power transformer product designs, is obtained by power meter measures
Silicon-steel sheet longitudinal-shearing and the horizontal total losses P cutC。
The present invention has the advantages that the evaluation method influenced is lost shearing of the invention with silicon steel sheet on transformer,
Under the premise of only considering that slitting generates stress influence, the slitting specific loss P of silicon steel sheet is measuredL0, then will pass through slitting and cross
The silicon steel sheet stack cut at iron core, measure silicon steel sheet by slitting and it is horizontal cut after total losses PC, then by slitting specific loss from total
It is separated in loss, calculates that silicon steel sheet is horizontal cuts specific loss PC0, utilize silicon-steel sheet longitudinal-shearing specific loss PL0Specific loss P is cut with horizontalC0With
National standard " method that GB/T 3655-2008 measures electrical sheet (band) magnetic property with epstein frame " or " GB/T 13789-
2008 with single chip tester measurement electrical sheet (band) magnetic property methods " measurement standard specific loss P0Ratio evaluate silicon steel
The drain performance of piece.
Detailed description of the invention
Fig. 1 is silicon steel oblique cut grafting partial structural diagram in the present embodiment step (1)；
Fig. 2 is the total losses P of iron core in the present embodiment step (3)CMeasurement figure；
Fig. 3 is that P is lost in the slitting of measurement square circle in the present embodiment step (2)LWith iron core total losses PcCircuit diagram；
Specific embodiment
For a better understanding of the invention, invention is described in detail below with reference to drawings and concrete examples.
A kind of shearing transformer is lost with silicon steel sheet the evaluation method of influence, which is characterized in that comprising steps of
It (1) is 10:1 slitting silicon steel band according to length-width ratio, the multiple that silicon steel sheet quantity is 4 is weighed with scale and is tested silicon steel
The gross mass m of piece, and m is greater than 5kg；In silicon steel sheet width and square circle geometric center lines ratio be 3% carry out double overlap joints (in conjunction with
Shown in Fig. 1 and Fig. 2, b/lc=3%), by interim excitation winding uniform winding on four sides of square circle, then by interim secondary winding
For uniform winding on four sides of square circle, interim excitation winding is identical as the position holding of secondary winding.
In specific loss after measuring silicon-steel sheet longitudinal-shearing, with reference to " GB/T 3655-2008 epstein frame measures electrician
The method of steel disc (band) magnetic property ", according to the theory of similarity, slitting silicon steel band is set as 10:1 according to length-width ratio, and quality is greater than
5kg, because of the high permeance (relative permeability 10000~50000) of silicon steel material, tested iron core weight reach 5kg with
(" method that GB/T 3655-2008 measures electrical sheet (band) magnetic property with epstein frame " and " GB/T 13789- when upper
2008 with the method for single chip tester measurement electrical sheet (band) magnetic property " tested sample is in 0.5kg or so), excitation winding produces
Influence of the raw leakage field to silicon steel material loss measurement can be ignored, therefore, using the method for interim winding winding to double overlap joints
Structure iron core excitation measures core loss, is convenient for measuring.According to the theory of similarity, length of magnetic path coefficient refers to national standard in measurement process
The equivalent magnetic circuit length that " method that GB/T 3655-2008 measures electrical sheet (band) magnetic property with epstein frame " uses
It is for 3% with the per unit value of geometric center line length, value 0.94, silicon steel sheet width of the present invention and square circle geometric center lines ratio
Controlling equivalent magnetic circuit length factor is 0.94.
(2) P is lost in the slitting for measuring square circleL(measurement process is as shown in figure 3, be wrapped in iron core using interim excitation winding
It is iron core excitation on four side columns, then slitting loss is obtained by measurement secondary winding voltage and excitation winding electric current with power meter
PL), the slitting specific loss P of silicon steel sheet is calculated according to formula (1) and formula (2)L0；
ma--- the effective mass of sample, kg
The gross mass of m --- sample, kg
L --- sample patch lengths, m
lm--- length of magnetic path coefficient, 0.94
lc--- square circle geometric center line length, m
PL0--- the slitting specific loss of sample, W/kg
PL--- the slitting total losses of sample, W
(3) using with power transformer product designing identical type, by the bridging arrangement of power transformer product design by silicon steel sheet
It is overlapped to form iron core, passes through power meter measures silicon-steel sheet longitudinal-shearing and the horizontal total losses P cutC(measuring circuit figure is as shown in Figure 3)；Measurement
When total losses, using identical with real transformer iron core side shape and bridging arrangement, silicon steel sheet stack is carried out at iron core
Measurement, this method consider slitting and the horizontal influence cut to silicon steel sheet loss simultaneously.
(4) specific loss P is cut according to formula (3) calculating is horizontalC0；
PC0--- the horizontal of sample cuts specific loss, W/kg
PC--- the total losses of sample, W
mL--- core limb is improved quality, kg
mac--- iron core angle weight, kg
(5) by standard " GB/T 3655-2008 with epstein frame measure electrical sheet (band) magnetic property method " or
The loss of " method that GB/T 13789-2008 measures electrical sheet (band) magnetic property with single chip tester " measurement silicon steel sheet, obtains
To the standard specific loss P of silicon steel sheet0, then according to formula (4) and formula (5) calculate separately sample slitting specific loss coefficient,
Horizontal to cut specific loss coefficient, after silicon steel sheet shearing is evaluated according to coefficient magnitude drain performance, the bigger silicon steel sheet of coefficient
Drain performance deterioration is more serious.
kL0--- the slitting loss factor of sample
kC0--- the horizontal of sample cuts loss factor
P0--- the sample specific loss that standard measure obtains, W/kg.
The evaluation method influenced is lost with silicon steel sheet to transformer using shearing of the invention, carries out two groups of tests,
It is as shown in table 1:
As it can be seen from table 1 the wide silicon steel sheet of two groups of difference pieces respectively by slitting and it is horizontal cut processing after, by calculating
To slitting specific loss coefficient kL0Specific loss coefficient k is cut with horizontalC0, it can be seen that the silicon steel sheet loss of embodiment 1 is less than embodiment 2
Middle silicon steel sheet loss, then according to the " side of GB/T 3655-2008 epstein frame measurement electrical sheet (band) magnetic property
Method " to measure the specific loss of two groups of silicon steel sheets be 0.83W/kg, thus, it is possible to find out, using shearing of the invention to change
The evaluation method influenced is lost with silicon steel sheet for depressor, can evaluate the drain performance of silicon steel sheet more accurately.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (3)
1. the evaluation method influenced is lost with silicon steel sheet on transformer for a kind of shearing, which is characterized in that by calculating silicon steel
The slitting specific loss coefficient of piece and the horizontal drain performance for cutting specific loss factor evaluation silicon steel sheet, specifically include step:
(1) silicon steel sheet is handled by slitting, the slitting specific loss P of silicon steel sheet after measurement slitting processingL0；
(2) steel disc is then cut into processing by horizontal, measure slitting and it is horizontal cut handle after silicon steel sheet total losses PC；
(3) specific loss P is cut by the way that formula (3) calculating is horizontalC0
PC0--- the horizontal of silicon steel sheet cuts specific loss, W/kg
PC--- the total losses of silicon steel sheet, W
mL--- core limb is improved quality, kg
mac--- iron core angle weight, kg
(4) according to national standard " GB/T 3655-2008 with epstein frame measure electrical sheet (band) magnetic property method " or
The loss of " method that GB/T 13789-2008 measures electrical sheet (band) magnetic property with single chip tester " measurement silicon steel sheet, obtains
To the standard specific loss P of silicon steel sheet0；
(5) silicon-steel sheet longitudinal-shearing specific loss PL0With standard specific loss P0Ratio obtain slitting specific loss coefficient, silicon steel sheet is horizontal to cut ratio
P is lostC0With standard specific loss P0Ratio obtain it is horizontal cut specific loss coefficient, the loss of silicon steel sheet is evaluated according to coefficient magnitude.
2. the evaluation method influenced is lost with silicon steel sheet on transformer for shearing according to claim 1, feature exists
In slitting specific loss P in the step (1)L0Specific measurement process are as follows: according to length-width ratio be 10:1 slitting silicon steel band, claim
The gross mass m of silicon steel sheet is measured, and m is greater than 5kg, being that 3% progress is double in silicon steel sheet width and square circle geometric center lines ratio takes
It connects；Then by interim excitation winding uniform winding on four sides of square circle, then by interim secondary winding uniform winding in square circle four
On a side, interim excitation winding is identical as the position holding of secondary winding, and P is lost using the slitting of power meter measures square circleL, root
The slitting specific loss P of sample is calculated according to formula (1) and formula (2)L0；
ma--- the effective mass of silicon steel sheet, kg
The gross mass of m --- silicon steel sheet, kg
L --- silicon steel sheet patch lengths, m
lm--- length of magnetic path coefficient, 0.94
lc--- square circle geometric center line length, m
PL0--- the slitting specific loss of silicon steel sheet, W/kg
PL--- the slitting total losses of silicon steel sheet, W.
3. the evaluation method influenced is lost with silicon steel sheet on transformer for shearing according to claim 1, feature exists
In total losses P in the step (2)CSpecific measurement process are as follows: using with power transformer product designing identical type, by becoming
Silicon steel sheet is overlapped to form iron core by the bridging arrangement of depressor product design, obtains silicon-steel sheet longitudinal-shearing by power meter measures and horizontal cuts
Total losses PC。
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