CN103163185B - Distribution transformer coil material nondestructive testing method - Google Patents
Distribution transformer coil material nondestructive testing method Download PDFInfo
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- CN103163185B CN103163185B CN201310069426.8A CN201310069426A CN103163185B CN 103163185 B CN103163185 B CN 103163185B CN 201310069426 A CN201310069426 A CN 201310069426A CN 103163185 B CN103163185 B CN 103163185B
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- 238000000034 method Methods 0.000 title claims abstract description 51
- 239000000463 material Substances 0.000 title claims abstract description 29
- 238000009659 non-destructive testing Methods 0.000 title abstract description 6
- 238000012360 testing method Methods 0.000 claims abstract description 37
- 239000002828 fuel tank Substances 0.000 claims abstract description 10
- 238000012417 linear regression Methods 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 20
- 239000004411 aluminium Substances 0.000 claims description 20
- 229910052782 aluminium Inorganic materials 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 13
- 239000010949 copper Substances 0.000 claims description 13
- 229910052802 copper Inorganic materials 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 4
- 239000002023 wood Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 2
- 238000012935 Averaging Methods 0.000 claims 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 abstract 1
- 238000012850 discrimination method Methods 0.000 abstract 1
- 230000001131 transforming effect Effects 0.000 description 21
- 238000004804 winding Methods 0.000 description 4
- 238000002405 diagnostic procedure Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001739 density measurement Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Abstract
The invention discloses a distribution transformer coil material nondestructive testing method, the detection method comprises a distribution transformer fuel tank volume discrimination method and a resistance temperature coefficient method. According to the invention, by a fuel tank volume for measuring distribution transform, compared with data in a routine fuel tank volume table, if the fuel tank volume for testing distribution transform exceeds the routine distribution transform by 30%, and the fuel tank is a suspected aluminum core transformer. The resistance temperature coefficient method is characterized in that a resistance temperature coefficient K value is measured and calculated to determine the coil material, on the basis of a distribution transform coil temperature model, the invention employs a multi-point linear regression method to inhibit random error generated in a test, and thereby the measure precision of K value can be increased. A multitime test result proves that a principle of the material detection method based on coil resistance temperature coefficient is correct, and the method is feasible. The invention is suitable for the nondestructive test of the distribution transformer material.
Description
technical field
The present invention relates to a kind of distribution transformer coils material lossless detection method, belong to power transformer detecting technical field.
background technology
Product quality is the basis of power grid security, and product quality supervision is the guarantee of goods and materials effective supply.Recently because copper, aluminium price differential are comparatively large, distribution transforming coil remains incessant after repeated prohibition with the phenomenon of aluminium for copper, brings very big hidden danger to power network safety operation, aluminium generally adopts copper material for copper substation transformer skin, adopt aluminium at inner coil, if do not decompose coil, be difficult to identify.Substation transformer monomer capacity, generally at below 2000kVA, for reducing the oxidation of insulating oil, adopts all-sealed structure usually, judges to cause larger difficulty to texture of coil, at present the domestic decision method that there is no maturation.Therefore, for distribution transforming aluminium for the focuses such as copper, difficult point quality problems, active research analysis and explore a kind of texture of coil Cleaning Principle and method just seems particularly urgent and important.
Publication number CN102749342A discloses a kind of non-destructive identification method for material of integral coil of distribution transformer, it is according to copper, steel, aluminium is to the difference of the attenuation coefficient of X ray, X ray is utilized to take pictures to the non-substation transformer disassembled under state, use black and white densitometer to the radiographic film density measurement of taking pictures, by the blackness value input computing machine measured, use industrial radiographic film family curve, pass through and the different x-ray tube voltage copper stored in a computer, steel, aluminium X-ray attenuation coefficient-scanning thickness curve calculates, comparison, the winding coil determining substation transformer is aluminium or copper.Although this method can judge the material of substation transformer, method is complicated.
summary of the invention
The object of the invention is, be material that is simple, that effectively differentiate distribution transforming coil, the invention provides a kind of comprehensive judging method of substation transformer material.
Technical scheme of the present invention is, the present invention, in conjunction with distribution transforming fuel tank volume diagnostic method and temperature-coefficient of electrical resistance method two flow processs, can realize the Non-Destructive Testing of distribution transforming material.
The inventive method step is as follows:
(1) by the method for substation transformer cubing and contrast, realize the preliminary judgement of substation transformer material, if the fuel tank volume of test substation transformer exceedes 30% of regular distribution oil tank of transformer volume, this test distribution transforming tentatively can judge that its coil is the transformer of aluminium;
(2) tested by the temperature coefficient of Outside Heating Method, judge texture of coil further, measure distribution transforming coil direct current resistance at different temperatures and temperature;
(3) error analysis and process are carried out to test data, suppress the error produced in test, improve the measuring accuracy of temperature-coefficient of electrical resistance;
Its source of error is in two points: starting point (i.e. reference point, the R of test
0, t
0deng) and test process point (R, t etc.), the temperature of these two points and resistance measurement error all can be divided into droop and random deviation;
For droop, analysis can be carried out from test method and improve;
For stochastic error, then the method for data processing can be adopted to reduce error, namely adopt linear regression method to process each resistance-temperature data, obtain the direct current resistance at different temperatures of distribution transforming coil accurately and temperature value;
(4) adopt linear regression method to process each resistance-temperature data, obtain resistance temperature linearity curve, obtained by linear equation:
Wherein, a is the slope of straight line, and b is the intercept of straight line.
(5) according to the temperature-coefficient of electrical resistance K that temperature-coefficient of electrical resistance method calculates, judge whether there is aluminium in distribution transforming; If K value is interval below 230, judge that texture of coil is as aluminium; Otherwise, judge that texture of coil is as copper material;
(6) if temperature-coefficient of electrical resistance method magnetic test coil exists aluminium, on-the-spot suspended core disassembly experiment can be carried out.
When the present invention adopts the temperature-coefficient of electrical resistance of Outside Heating Method to test, adopt substation transformer wood properly test Special constant temperature baking oven and precision to be that the High-accuracy direct current resistance meter of 0.2 grade measures distribution transforming coil direct current resistance at different temperatures and temperature, calculate temperature-coefficient of electrical resistance K by distribution transforming coil temperature model; The temperature model of distribution transforming coil adopts following formula:
In formula: R, t are hot resistance and temperature; R
0, t
0for cold-state resistance and temperature;
From
the computing formula of K value can be obtained in formula:
Obviously, as long as Measurement accuracy distribution transforming coil direct current resistance at different temperatures and temperature, just K value be can calculate, thus copper, aluminium material differentiated.Wherein K gets 230 is the critical points differentiating distribution transforming texture of coil.If K value is interval below 230, be judged to be aluminium; Otherwise, be judged to be copper material.The key that serviceability temperature Y-factor method Y differentiates distribution transforming material to the accurate measurement of the accurate control of coil temperature, measurement and direct current resistance in whole test.
In order to improve the measuring accuracy of temperature-coefficient of electrical resistance, error analysis and process need be carried out to test data.For stochastic error, then the method for data processing can be adopted to reduce error.
From
in can obtain the resistance-temperature expression formula of resistance R:
Linear regression method can be adopted like this to process each resistance-temperature data, obtain a unified linear equation:
Adopt linear regression method to process each resistance-temperature data, obtain a unified linear equation:
Namely the slope by straight line asks for K value more accurately.
Beneficial effect of the present invention is: the method proposing the Non-Destructive Testing of a kind of distribution transformer coils material, this method avoid and carries out on-the-spot suspended core disassembly experiment and cause distribution transforming to damage.Judge relative method and temperature-coefficient of electrical resistance method two testing processes by volume, experiment results proved the method accurately and rationality.The inventive method is simple, accurate, practical.
The present invention is applicable to the Non-Destructive Testing of distribution transformer coils material.
accompanying drawing explanation
Fig. 1 is the front view to substation transformer dimensional measurement in volume diagnostic method of the present invention;
Fig. 2 is the left view to substation transformer dimensional measurement in volume diagnostic method of the present invention;
Fig. 3 is transformer material comprehensive judging method process flow diagram;
Fig. 4 is resistance temperature curve and test K value.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
Embodiment of the present invention substation transformer physical dimension as depicted in figs. 1 and 2, with reference to substation transformer dimensional measurement schematic diagram, first fuel tank cubing is carried out to the size indication of sampling observation transformer, concrete grammar is use tape measure respectively to measure length once in the upper and lower of substation transformer, averages.If the fuel tank volume of test distribution transforming exceedes 30% of conventional distribution transforming, this test substation transformer tentatively can judge that its coil is the transformer of aluminium.
As shown in Fig. 3 distribution transformer coils material Non-Destructive Testing procedural block diagram, the substation transformer of the embodiment of the present invention is carried out to the temperature coefficient test of Outside Heating Method.
Distribution transformer coils wood properly test Special constant temperature baking oven and High-accuracy direct current resistance meter is adopted in test, for improving temperature-coefficient of electrical resistance measuring accuracy, error analysis and process need be carried out to measurement data, namely test under several temperature are chosen in normal temperature to a 90 DEG C interval, by the direct current resistance of measuring transformer high and low pressure side, matched curve is analyzed by the linear multi Return Law, draw resistance temperature curve model, before this model improves, the degree of accuracy of 2 accounting temperature COEFFICIENT K only chosen by distribution transforming coil temperature model.
Adopt distribution transforming wood properly test Special constant temperature baking oven in test, its advantage is that coil temperature is substantially identical with oil temperature, and thermal equilibrium can be made in confined space more easily to realize, and can obtain coil temperature more exactly by test oil temperature.Due to the temperature difference of circulation constant temperature baking oven and temperature fluctuation less, therefore only need measure the data of normal temperature and about 90 DEG C two points, coil resistance temperature coefficient K value can be calculated according to the temperature model of distribution transforming coil.
With reference to Fig. 4, by analyzing the curve that linear regression draws, only need calculated curve slope can calculate temperature-coefficient of electrical resistance K value, basis for estimation: K value gets 230 for critical point, if K value is interval below 230, is judged to be aluminium; Otherwise, be judged to be copper material.
Table 1 is the comparison table of embodiment of the present invention substation transformer winding resistance temperature curve slope and K value.
The relation of table 1 winding resistance temperature curve slope and K value
| Winding group | Slope | Intercept | Related coefficient | K value |
| Low pressure a | 0.006727 | 1.58587 | 0.9998 | 235.75 |
| Low pressure b | 0.006737 | 1.58932 | 0.99962 | 235.91 |
| Low pressure c | 0.006743 | 1.5881 | 0.99978 | 235.52 |
| High pressure AB | 0.009171 | 2.05678 | 0.99999 | 224.27 |
| High pressure BC | 0.009184 | 2.05804 | 0.99999 | 224.09 |
| High pressure CA | 0.009165 | 2.05557 | 0.99994 | 224.28 |
Claims (3)
1. a distribution transformer coils material lossless detection method, is characterized in that, described method step is:
(1) by the method for substation transformer cubing and contrast, substation transformer material is tentatively judged; Compare with the substation transformer of corresponding model, if the fuel tank volume of test substation transformer exceedes 30% of regular distribution oil tank of transformer volume, this test substation transformer tentatively judges that its coil is the transformer of aluminium;
(2) tested by the temperature coefficient of Outside Heating Method, judge texture of coil further, measure distribution transformer coils direct current resistance at different temperatures and temperature;
(3) error analysis and process are carried out to test data, suppress the error produced in test, improve the measuring accuracy of temperature-coefficient of electrical resistance;
Its source of error is in two points: the starting point of test and the process point of test, and the temperature of these two points and resistance measurement error averaging are droop and random deviation;
For droop, carry out analysis from test method and improve;
For stochastic error, then adopt the method for data processing to reduce error, namely adopt linear regression method to process each resistance-temperature data, obtain the direct current resistance at different temperatures of distribution transformer coils accurately and temperature value;
(4) adopt linear regression method to process each resistance-temperature data, obtain resistance temperature linearity curve, obtained by linear equation:
Wherein, a is the slope of straight line, and b is the intercept of straight line;
(5) according to temperature-coefficient of electrical resistance K, judge whether there is aluminium in substation transformer; If K value is interval below 230, judge that texture of coil is as aluminium; Otherwise, judge that texture of coil is as copper material;
(6) if temperature-coefficient of electrical resistance method magnetic test coil exists aluminium, on-the-spot suspended core disassembly experiment is carried out.
2. a kind of distribution transformer coils material lossless detection method according to claim 1, it is characterized in that, the temperature coefficient test of described Outside Heating Method, employing distribution transformer coils wood properly test Special constant temperature baking oven and precision are the High-accuracy direct current resistance meter of 0.2 grade.
3. a kind of distribution transformer coils material lossless detection method according to claim 1, it is characterized in that, in the temperature coefficient test of described Outside Heating Method, test under several temperature are chosen in normal temperature to a 90 DEG C interval, by measuring the direct current resistance of substation transformer high and low pressure side, analyze matched curve by the linear multi Return Law, draw resistance temperature curve model, before this model improves, distribution transformer coils temperature model only chooses the degree of accuracy of 2 accounting temperature COEFFICIENT K.
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| CN201310069426.8A CN103163185B (en) | 2013-03-05 | 2013-03-05 | Distribution transformer coil material nondestructive testing method |
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| CN201310069426.8A CN103163185B (en) | 2013-03-05 | 2013-03-05 | Distribution transformer coil material nondestructive testing method |
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| CN103163185A CN103163185A (en) | 2013-06-19 |
| CN103163185B true CN103163185B (en) | 2014-12-31 |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604996A (en) * | 2013-11-28 | 2014-02-26 | 国家电网公司 | Device and method for measuring overhead stranded wire resistance temperature coefficient |
| CN103604837B (en) * | 2013-11-28 | 2015-12-02 | 国家电网公司 | The recognition methods of distribution transformer coil material |
| DE102015104108A1 (en) * | 2014-03-20 | 2015-09-24 | GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) | PARAMETER ESTIMATION IN AN ACTOR |
| CN104502369B (en) * | 2014-08-08 | 2017-08-22 | 贵州电力试验研究院 | The non-disintegration texture of coil discrimination method of three dimensional wound core oil immersion Three-Phase Distribution Transformers |
| CN104458812A (en) * | 2014-11-20 | 2015-03-25 | 国家电网公司 | Method for recognizing coil material of distribution transformer |
| CN104914310B (en) * | 2015-03-10 | 2018-04-24 | 国网四川省电力公司电力科学研究院 | The temperature resistance curve of distribution transformer winding obtains device and method |
| CN104677927B (en) * | 2015-03-10 | 2017-12-01 | 国网四川省电力公司电力科学研究院 | Distribution transformer winding wood properly test system and method |
| CN105092660A (en) * | 2015-06-29 | 2015-11-25 | 云南电网有限责任公司电力科学研究院 | Transformer winding material identification method based on resistance temperature coefficient |
| CN104991136B (en) * | 2015-06-29 | 2018-08-14 | 云南电网有限责任公司电力科学研究院 | It is a kind of based on content volume than copper aluminium winding transformer discriminating method |
| CN104977324A (en) * | 2015-07-28 | 2015-10-14 | 国网浙江省电力公司电力科学研究院 | Method for identifying material of transformer winding |
| CN105758874B (en) * | 2016-02-18 | 2019-03-12 | 云南电网有限责任公司电力科学研究院 | A method of determining electrical equipment texture of coil |
| CN106404844A (en) * | 2016-08-26 | 2017-02-15 | 国网山东省电力公司高唐县供电公司 | Transformer winding material identification method |
| CN107037285A (en) * | 2017-04-13 | 2017-08-11 | 云南电网有限责任公司电力科学研究院 | A kind of detection method and device of distribution transformer |
| CN108398459B (en) * | 2018-03-09 | 2020-08-14 | 武汉大学 | Distribution oil variable winding material azimuth thermal resistance temperature curve identification method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR9815771A (en) * | 1998-03-27 | 2004-04-13 | Allied Signal Inc | Dry type transformer featuring a substantially rectangular coil with embedded resin and manufacturing process |
| CN101726515B (en) * | 2008-10-16 | 2012-11-21 | 淄博计保互感器研究所 | Tester and testing method for winding lead material of transformer |
| CN102749342B (en) * | 2012-07-20 | 2014-12-10 | 贵州电力试验研究院 | Non-destructive identification method for material of integral coil of distribution transformer |
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