CN106918747A - Transformer Winding number of turn error pattern detects method - Google Patents
Transformer Winding number of turn error pattern detects method Download PDFInfo
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- CN106918747A CN106918747A CN201511000952.4A CN201511000952A CN106918747A CN 106918747 A CN106918747 A CN 106918747A CN 201511000952 A CN201511000952 A CN 201511000952A CN 106918747 A CN106918747 A CN 106918747A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/20—Measuring number of turns; Measuring transformation ratio or coupling factor of windings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
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Abstract
The present invention relates to a kind of Transformer Winding number of turn error pattern detection method.Mainly solve existing detection method speed slow, workload is big, input is high, the unstable problem of accuracy.No-load voltage ratio error value first by being measured outside transformer determines the no-load voltage ratio error value of each single-phase winding of inside transformer, no-load voltage ratio error value control " error pattern look-up table " of each single-phase winding is determined into winding bit-error locations and mistake property, error numbers can be calculated, so as to judge that inside transformer which coil turn has mistake.With detection speed it is quick and easy the characteristics of.
Description
Technical field
The present invention relates to transformer coil technical field, specifically a kind of Transformer Winding number of turn error pattern detection method.
Background technology
Transformer is the important power equipment for being widely used in producing, living, year manufacture, operation maintenance amount, repairing amount
It is very huge.The quality inspection experiment of transformer is divided into the major classes such as delivery test, commissioning test, preventive trial by purposes, respectively
Major class include pilot project quantity do not wait, require it is different, no-load voltage ratio experiment be above-mentioned each major class experiment be required to carry out it is important
One of basic test project, no-load voltage ratio test objective are whether detection each umber of turn of transformer and voltage ratio are normal but conventional
No-load voltage ratio experiment can only measure the error of winding or coil turn ratio, it is impossible to it is determined that the number of turn mistake feelings of specific some coil
Condition, including determine to be incorrect which coil turn and position of number of turn mistake and numerical value is how many, and be appropriately determined not
Qualified coil and its number of turn error situation are the foundations for carrying out subsequent handling, extremely important, and existing detection method speed is slow,
Workload is big, and input is high, and accuracy is unstable, high to personnel's theoretical level and working experience requirement, and range of application has limitation.
The content of the invention
To solve problem present in background technology, the present invention proposes a kind of detection speed soon, and accuracy is high, operation letter
Just Transformer Winding number of turn error pattern detection method.
The technical solution adopted in the present invention is：A kind of Transformer Winding number of turn error pattern detects method, first by transformation
The no-load voltage ratio error value measured outside device determines the no-load voltage ratio error value of each single-phase winding of inside transformer, by the no-load voltage ratio of each single-phase winding
Error value control " the error pattern table of comparisons " determines winding bit-error locations and mistake property, can calculate error numbers, so that
Judging inside transformer which coil turn has mistake；
The two-phase no-load voltage ratio deviation of transformer is set to AiBi、Bi Ci、AiCi, the no-load voltage ratio deviation of each single-phase winding of A, B, C is Ai、
Bi 、Ci；
So, the no-load voltage ratio deviation formula of each single-phase winding of transformer A, B, C is respectively：
Ai=AiBi+AiCi-Bi Ci
Bi=AiBi+BiCi-AiCi
Ci=AiCi+BiCi-AiBi
Wherein, I, II, III is three gears of transformer；
Thus the no-load voltage ratio error value for outside being measured is converted into the no-load voltage ratio error value of each single-phase winding of inside transformer, obtains transformation
After the no-load voltage ratio error value of each single-phase winding in device inside, the A for obtainingi、Bi 、CiAllowed by the error of measured value contrast normal amount
In the range of be set to 0, measured value is set to δ beyond allowed band value；
If the transformer low voltage number of turn is N circles, single bag no-load voltage ratio of transformer is k, then transformer low voltage, the high pressure number of turn be respectively N,
KN circles, then δ=(kActual measurement–k)÷k×100%
Wherein：δ --- -- ratio error
kActual measurement--- -- no-load voltage ratio actual measured value
Single bag of k --- --- transformer becomes ratio
If the high pressure error number of turn is NThe high pressure error number of turn
kActual measurement=kδ+k
Thus push away
NThe high pressure error number of turn=NkActual measurement–kN=δkN
If the low pressure error number of turn is NThe low pressure error number of turn
kActual measurement=kδ+k
Thus can be derived from
NThe low pressure error number of turn=NActual measurement–N=kN÷(kδ+k)-N=N÷（1+δ）-N=-δ÷（1+δ）×N≈-δN.
Beneficial effect is：By the technical solution adopted in the present invention, the safe devoid of risk of present invention application, with traditional side
Method compares need not measure high voltage, without contacting the equipment that high-voltage mutual inductor etc. has high pressure electric shock hidden danger, without moving transformation
Device coil, operation process simplifies, safe and efficient, is adapted to mobile operational process application, without region limitation, using the present invention, without volume
Outer investment, benefit is obvious.
Brief description of the drawings
Fig. 1 is connection set Dyn11 structure diagrams.
Fig. 2 is connection set Yyn0 structure diagrams.
Specific embodiment
The present invention will be further described below in conjunction with the accompanying drawings.
A kind of Transformer Winding number of turn error pattern detects method, and the no-load voltage ratio error value by being measured outside transformer first determines
The no-load voltage ratio error value of each single-phase winding of inside transformer, forms no-load voltage ratio error value table, by the no-load voltage ratio of each single-phase winding according to formula 1
Error value control " the error pattern table of comparisons " determines winding bit-error locations and mistake property, can be calculated according to formula 2, formula 3
Make mistakes numerical value, so as to judge that inside transformer which coil turn has mistake；The two-phase no-load voltage ratio deviation of transformer is set to
AiBi、Bi Ci、AiCi, the no-load voltage ratio deviation of each single-phase winding of A, B, C is Ai、Bi 、Ci；
So, the no-load voltage ratio deviation formula of each single-phase winding of transformer A, B, C is respectively：
Ai=AiBi+AiCi-Bi Ci
Bi=AiBi+BiCi-AiCiFormula 1
Ci=AiCi+BiCi-AiBi
Wherein, I, II, III is three gears of transformer；
Thus the no-load voltage ratio error value for outside being measured is converted into the no-load voltage ratio error value of each single-phase winding of inside transformer, obtains transformation
After the no-load voltage ratio error value of each single-phase winding in device inside, the A for obtainingi、Bi 、CiAllowed by the error of measured value contrast normal amount
In the range of be set to 0, measured value is set to δ beyond allowed band value；Set up failure transformer error pattern table.Hereafter " mistake is compareed
Pattern collation table " determines winding bit-error locations and mistake property.
No-load voltage ratio test result one for ± 5% third gear transformer has 23=8 kinds of situations, table 1 lists third gear transformer
No-load voltage ratio tests 8 kinds of patterns of mistake, and gives corresponding number of turn bit-error locations, and table 2 lists 8 kinds of mistake properties of pattern.
The error pattern table of comparisons of table 1
| Gear | Pattern 1 | Pattern 2 | Pattern 3 | Pattern 4 | Pattern 5 | Pattern 6 | Mode 7 | Pattern 8 |
| Ⅰ | 0 | δ | δ | δ | 0 | 0 | δ | 0 |
| Ⅱ | 0 | δ | δ | 0 | δ | 0 | 0 | δ |
| Ⅲ | 0 | δ | 0 | 0 | 0 | δ | δ | δ |
| Number of turn bit-error locations | Zero defect | Low pressure high pressure principal piece |
Wherein：0--- represents measured value in allowed band, i.e. ratio error in below Δ %,
δ --- represent that measured value exceeds allowed band value, and think that each δ is equal.
When transformer is operated in III grade, " the principal piece number of turn " work of winding；When transformer is operated in II grade, winding
" the principal piece number of turn+N12 " works；When transformer is operated in I grade, " the principal piece number of turn+N12+N11 " work of winding；According to formula
δ= (kActual measurement- k) ÷ k × 100% can derive：
In the case of pattern 1, III grade of test is 0, illustrates " principal piece " number of turn and theoretical equal turn numbers, i.e. the principal piece number of turn is correct；Ⅱ
Shelves test be 0, illustrate " principal piece+N12 " number of turn and with theoretical equal turn numbers, and the principal piece number of turn correctly, so the N12 numbers of turn are correct；Ⅰ
Shelves test is 0, illustrate " principal piece+N12+N11 " number of turn and with theoretical equal turn numbers, and principal piece, the N12 numbers of turn are correctly, then N11 circles
Number is correct；
In the case of pattern 2, III grade of test is δ, illustrates that " principal piece " has number of turn mistake δ；II grade of test is δ, illustrate " principal piece+
N12 " has number of turn mistake δ, and principal piece has number of turn mistake δ, so the N12 numbers of turn are correct；I grade of test is δ, illustrates " principal piece+N12+
N11 " has number of turn mistake δ, and principal piece has number of turn mistake δ, the N12 number of turn correct, then the N11 numbers of turn are correct；
In the case of pattern 3, III grade of test is 0, illustrates " principal piece " number of turn and theoretical equal turn numbers, i.e. the principal piece number of turn is correct；Ⅱ
Shelves test is δ, illustrates that " principal piece+N12 " has number of turn mistake δ, and must be that N12 has the number of turn poor because the principal piece number of turn is correct
Wrong δ；I grade of test is δ, illustrate " principal piece+N12+N11 " and have number of turn mistake δ, and the principal piece number of turn is correctly, and N12 has the number of turn poor
Wrong δ, then the N11 numbers of turn are correct；
In the case of pattern 4, III grade of test is 0, illustrates " principal piece " number of turn and theoretical equal turn numbers, i.e. the principal piece number of turn is correct；Ⅱ
Shelves test is 0, illustrate " principal piece+N12 " number of turn and correct, and because the principal piece number of turn correctly, the N12 numbers of turn are correct；I grade of test
It is δ, it is illustrating " principal piece+N12+N11 " and have number of turn mistake δ, and the principal piece number of turn, N12 are correct, then and N11 has number of turn mistake；
In the case of pattern 5, III grade of test is 0, illustrates " principal piece " number of turn and theoretical equal turn numbers, i.e. the principal piece number of turn is correct；Ⅱ
Shelves test is δ, illustrates that " principal piece+N12 " has number of turn mistake δ, and because the principal piece number of turn is correct, N12 has number of turn mistake δ；Ⅰ
Shelves test is 0, illustrate " principal piece+N12+N11 " number of turn and correct, but the principal piece number of turn correctly, N12 have number of turn mistake δ, then N11
There is number of turn mistake-δ；
In the case of pattern 6, III grade of test is δ, illustrates that " principal piece " has number of turn mistake δ；II grade of test is 0, illustrate " principal piece+
N12 " the numbers of turn and correct, but principal piece has number of turn mistake δ, so N12 has number of turn mistake-δ；I grade of test is 0, illustrate " principal piece+
N12+N11 " the numbers of turn and correct, but principal piece has number of turn mistake δ, N12 to have number of turn mistake-δ, then and the N11 numbers of turn are correct；
In the case of mode 7, III grade of test is δ, illustrates that " principal piece " has number of turn mistake δ；II grade of test is 0, illustrate " principal piece+
N12 " the numbers of turn and correct, but principal piece has number of turn mistake δ, so N12 has number of turn mistake-δ；I grade of test is δ, illustrate " principal piece+
N12+N11 " has a number of turn mistake δ, and principal piece has number of turn mistake δ, N12 to have number of turn mistake-δ, then N11 has number of turn mistake δ；
In the case of pattern 8, III grade of test is δ, illustrates that " principal piece " has number of turn mistake δ；II grade of test is δ, illustrate " principal piece+
N12 " has number of turn mistake δ, and principal piece has number of turn mistake δ, so the N12 numbers of turn are correct；I grade of test is 0, illustrates " principal piece+N12+
N11 " the numbers of turn and correct, but principal piece has number of turn mistake δ, the N12 number of turn correct, then and N11 has number of turn mistake-δ.
Embodiment 1, if the transformer low voltage number of turn is N circles, single bag no-load voltage ratio of transformer is k, then transformer low voltage, high pressure circle
Number is respectively N, kN circle, then δ=(kActual measurement–k)÷k×100%
Wherein：δ --- -- ratio errors embodiment 1
kActual measurement--- -- no-load voltage ratio actual measured value
Single bag of k --- --- transformer becomes ratio
If the high pressure error number of turn is NThe high pressure error number of turn
kActual measurement=kδ+k
Thus push away
NThe high pressure error number of turn=N kActual measurement- kN=δ kN formula 2
If the low pressure error number of turn is NThe low pressure error number of turn
kActual measurement=kδ+k
Thus can be derived from
NThe low pressure error number of turn=NActual measurement–N=kN÷(kδ+k)-N=N÷（1+δ）-N=-δ÷（1+δ）× N ≈-δ N formula 3.
From above-mentioned derivation it is concluded that --- ratio error is with the relation of transformer turn error：Work as no-load voltage ratio
In the presence of error delta, if high pressure number of turn problem, then high pressure number of turn error value is the product δ kN of δ and the high pressure number of turn；If low pressure circle
Number problem, then low pressure number of turn error value is that δ is reverse with the product of the low pressure number of turn：I.e. 0 positive errors of δ ＞ when, the few δ N circles of the low pressure number of turn
Number or many δ kN of the high pressure number of turn；During δ 0 negative errors of ＜, many δ N numbers of turn of the low pressure number of turn or the high pressure number of turn lack the δ kN numbers of turn.
Example 1, transformer parameter：Model S11-80/6.3 capacity 80kVA, 6300 ± 5%/400V of voltage ratio, connection set
Dyn11, I grade of number of turn of low pressure/high pressure is N/N1=51/1457 circles.
No-load voltage ratio index is tested during semi-finished product, the table 1-1 no-load voltage ratio error value tables on basis are obtained；Using formula of the present invention 1
Form the no-load voltage ratio error value table of the table single-phase winding of 2-2 inside transformers；
The no-load voltage ratio error value table of the table 1-1 transformers outside no-load voltage ratio error value table table single-phase winding of 1-2 inside transformers
| Gear | Gear | ||||||
| I grade | -2.39 | -0.03 | -2.39 | I grade | -4.75 | -0.03 | -0.03 |
| II grade | 2.39 | -0.02 | 2.39 | II grade | 4.80 | -0.02 | -0.02 |
| III grade | 2.40 | 0.00 | 2.40 | III grade | 4.80 | 0.00 | 0.00 |
The theoretical no-load voltage ratio of I grade of single-phase winding is K1=1457/51=28.569, the theoretical no-load voltage ratio K2=1391/51=of II grade of single-phase winding
27.275, the theoretical no-load voltage ratio of III grade of single-phase winding is K3=1325/51=25.980, theoretical change of I grade of the single-phase winding relative to II grade
It is 4.74% than error value, theoretical no-load voltage ratio error value of II grade of the single-phase winding relative to III grade is 4.98%.
B phase windings are normal in table 1-2, and C phase windings are normal, due to AⅠ=-4.75%, then AⅠIt is II grade；AⅡ=4.80%, then AⅡ
It is I grade；AⅢ=4.80%, then AⅢIt is II grade；
Eventually form the gear corresponding table of table 1-3 Transformer Windings；
This failure is exactly transformer A phase tap lead connection errors；
Table 1-3 Transformer Winding gear corresponding tables
Embodiment 2：Transformer manufacturing parameter：Model S11-80/6.3 capacity 80kVA, 6300 ± 5%/400V of voltage ratio,
Connection set Dyn11, I grade of number of turn of low pressure/high pressure is N/N1=51/1457 circles.
No-load voltage ratio index is tested during semi-finished product, the no-load voltage ratio error value table on table 2-1 bases is obtained, using formula of the present invention 1
Form the no-load voltage ratio error value table of the table single-phase winding of 2-2 inside transformers；
The no-load voltage ratio error value table of the table 2-1 transformers outside no-load voltage ratio error value table table single-phase winding of 2-2 inside transformers
| Gear | Gear | ||||||
| I grade | -0.03 | -0.03 | 0.03 | I grade | -0.03 | -0.03 | -0.03 |
| II grade | -0.02 | 0.02 | 0.02 | II grade | -0.02 | -0.02 | 0.05 |
| III grade | 0.00 | 0.04 | 0.04 | III grade | 0.00 | 0.00 | 0.08 |
The high-low pressure number of turn as known to transformer determines that Δ % is as follows：
Table 2-3 obtains minimum demand value | Δ % |
| the Δ % |=0.065 that in table 2-3, takes minimum demand value；Table 2-2 A phases, B phase errors are consistent with design error, therefore A phases, B
Phase error is normal；Design error is to be individually present, and obtaining design error can play as objective in A, B, C three-phase all failures
The effect of reference.
Table 2-4 failure transformer umber of turn error pattern tables are formed according to regular principle of the invention；
Table 2-4 failure transformer umber of turn error pattern tables
| Transformer gear | |||
| I grade | 0 | 0 | 0 |
| II grade | 0 | 0 | δ |
| III grade | 0 | 0 | δ |
The control third gear Transformer Winding number of turn error pattern table of comparisons of table 1 of the present invention, according to pattern analysis, can derive and be out of order
Three-Phase Transformer winding failure pattern is A facies models 1, B facies models 1, C facies models 8；
Pattern 1 represents A, and the phase winding no-load voltage ratios of B two are normal；
C facies models 8 represent that C phase windings principal piece and N11 are problematic；
The control third gear Transformer Winding number of turn error pattern table of comparisons of table 1 of the present invention, can learn mistake property, can know C phases
Winding high voltage N12 and low pressure are normal, and C phase high-tension coil N principal piece+N11=N principal piece standard+N11 standards；
Many 1 circles of C phase high-tension coils principal piece are calculated using formula of the present invention 2,
Few 1 circles of N11 between shelves, process is as follows：
δkN =(0.08%)× (1325)=1.06≈1
Few 1 circles of N11 between many 1 circles of C phase high pressure windings principal piece, shelves.
Example 3, transformer nameplate parameter：Model S9-M-1600/6.3 capacity 1600kVA, voltage ratio 6300 ± 5%/
400V, connection set Yyn0, phenomenon of the failure are that Transformer transformer temperature is high, and are judged to that transformer is overheated；
I grade of number of turn of known low-pressure/high pressure is N/N1=13/215 circles；
Transformer outside no-load voltage ratio index is measured by scene, the no-load voltage ratio error value table on table 3-1 bases is obtained, utilized
Formula of the present invention 1 forms the no-load voltage ratio error value table of the table single-phase winding of 3-2 inside transformers；
The no-load voltage ratio error value table of the table 3-1 transformers outside no-load voltage ratio error value table table single-phase winding of 3-2 inside transformers
| Gear | Gear | ||||||
| I grade | -0.24 | 0.00 | -0.46 | I grade | -0.70 | 0.22 | -0.22 |
| II grade | -0.38 | -0.14 | -0.62 | II grade | -0.86 | 0.10 | -0.38 |
| III grade | -0.52 | -0.26 | -0.78 | III grade | -1.04 | 0.00 | -0.51 |
The high-low pressure number of turn as known to transformer determines that Δ % is as follows：
Table 3-3 obtains minimum demand value | Δ % |
| the Δ % |=0.44 that in table 3-3, takes minimum demand value；B phases error is consistent with design error in table 3-2, therefore B phase errors
For normal；Design error is to be individually present, and obtaining design error can play as objective reference's in A, B, C three-phase all failures
Effect.
Table 3-4 failure transformer umber of turn error pattern tables are formed according to regular principle of the invention；
Table 3-4 failure transformer umber of turn error pattern tables
| Transformer gear | |||
| I grade | 0 | δ | |
| II grade | 0 | δ | |
| III grade | 0 | δ |
The control third gear Transformer Winding number of turn error pattern table of comparisons 1 of the present invention, can find the event of failure transformer three-phase windings
Barrier pattern is A facies models 2, B facies models 1, C facies models 2；
B facies models 1 represent that B phase winding no-load voltage ratios are normal；
A facies models 2 represent that A phases low pressure winding or high pressure winding principal piece are problematic, and A phases are judged by ratio error numerical value very little
Low pressure winding is normal, and A phase high pressure winding principal pieces are problematic；
C facies models 2 represent that C phases low pressure winding or high pressure winding principal piece are problematic, and C phases are judged by ratio error numerical value very little
Low pressure winding is normal, and C phase high pressure winding principal pieces are problematic；
The control third gear Transformer Winding number of turn error pattern table of comparisons of table 1 of the present invention, mistake property can be learnt according to error pattern,
The property of multiturn or few circle can be known.
It is as follows using the process of formula of the present invention 2：
δ1kN =(-1.04%)×(6000/400)×13=-2.03≈-2
δkN =(-0.51%)×(6000/400)×13=-0.995≈-1
Calculate few 2 circles of A phases principal piece, few 1 circle of C phases principal piece.
Claims (2)
1. a kind of Transformer Winding number of turn error pattern detects method, it is characterised in that：No-load voltage ratio first by being measured outside transformer
Error value determines the no-load voltage ratio error value of each single-phase winding of inside transformer, and the no-load voltage ratio error value of each single-phase winding is compareed into " mistake
Pattern look-up table " determines winding bit-error locations and mistake property, can calculate error numbers, so as to judge in transformer
Which coil turn of portion has mistake.
2. Transformer Winding number of turn error pattern according to claim 1 detects method, it is characterised in that：The double of transformer
Phase no-load voltage ratio deviation is set to AiBi、Bi Ci、AiCi, the no-load voltage ratio deviation of each single-phase winding of A, B, C is Ai、Bi 、Ci；
So, the no-load voltage ratio deviation formula of each single-phase winding of transformer A, B, C is respectively：
Ai=AiBi+AiCi-Bi Ci
Bi=AiBi+BiCi-AiCi
Ci=AiCi+BiCi-AiBi
Wherein, I, II, III is three gears of transformer；
Thus the no-load voltage ratio error value for outside being measured is converted into the no-load voltage ratio error value of each single-phase winding of inside transformer, obtains transformation
After the no-load voltage ratio error value of each single-phase winding in device inside, the A for obtainingi、Bi 、CiAllowed by the error of measured value contrast normal amount
In the range of be set to 0, measured value is set to δ beyond allowed band value；
If the transformer low voltage number of turn is N circles, single bag no-load voltage ratio of transformer is k, then transformer low voltage, the high pressure number of turn be respectively N,
KN circles, then δ=(kActual measurement–k)÷k×100%
Wherein：δ --- -- ratio error
kActual measurement--- -- no-load voltage ratio actual measured value
Single bag of k --- --- transformer becomes ratio
If the high pressure error number of turn is NThe high pressure error number of turn
kActual measurement=kδ+k
Thus push away
NThe high pressure error number of turn=NkActual measurement–kN=δkN
If the low pressure error number of turn is NThe low pressure error number of turn
kActual measurement=kδ+k
Thus can be derived from
NThe low pressure error number of turn=NActual measurement–N=kN÷(kδ+k)-N=N÷（1+δ）-N=-δ÷（1+δ）×N≈-δN.
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| CN108732430A (en) * | 2018-05-23 | 2018-11-02 | 安徽省神虹变压器股份有限公司 | A kind of twin voltage detection method of transformer cartridge type umber of turn |
| CN112259360A (en) * | 2020-12-22 | 2021-01-22 | 三变科技股份有限公司 | Production method and turn number verification method of epoxy resin cast coil of dry-type transformer |
| CN113300370A (en) * | 2021-05-28 | 2021-08-24 | 国网福建省电力有限公司电力科学研究院 | Automatic low-voltage intelligent substation area line voltage adjusting method |
| CN114137442A (en) * | 2021-11-23 | 2022-03-04 | 保定天威集团特变电气有限公司 | Transformer short-circuit fault diagnosis method and device |
| CN116359625A (en) * | 2023-04-03 | 2023-06-30 | 三变科技股份有限公司 | Production method of double-split transformer and method for detecting abnormal number of turns of high-voltage coil |
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| CN108732430A (en) * | 2018-05-23 | 2018-11-02 | 安徽省神虹变压器股份有限公司 | A kind of twin voltage detection method of transformer cartridge type umber of turn |
| CN112259360A (en) * | 2020-12-22 | 2021-01-22 | 三变科技股份有限公司 | Production method and turn number verification method of epoxy resin cast coil of dry-type transformer |
| CN112259360B (en) * | 2020-12-22 | 2021-03-02 | 三变科技股份有限公司 | Production method and turn number verification method of epoxy resin cast coil of dry-type transformer |
| CN113300370A (en) * | 2021-05-28 | 2021-08-24 | 国网福建省电力有限公司电力科学研究院 | Automatic low-voltage intelligent substation area line voltage adjusting method |
| CN114137442A (en) * | 2021-11-23 | 2022-03-04 | 保定天威集团特变电气有限公司 | Transformer short-circuit fault diagnosis method and device |
| CN116359625A (en) * | 2023-04-03 | 2023-06-30 | 三变科技股份有限公司 | Production method of double-split transformer and method for detecting abnormal number of turns of high-voltage coil |
| CN116359625B (en) * | 2023-04-03 | 2024-01-02 | 三变科技股份有限公司 | Production method of double-split transformer and method for detecting abnormal number of turns of high-voltage coil |
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