CN103163185A - Distribution transformer coil material nondestructive testing method - Google Patents
Distribution transformer coil material nondestructive testing method Download PDFInfo
- Publication number
- CN103163185A CN103163185A CN2013100694268A CN201310069426A CN103163185A CN 103163185 A CN103163185 A CN 103163185A CN 2013100694268 A CN2013100694268 A CN 2013100694268A CN 201310069426 A CN201310069426 A CN 201310069426A CN 103163185 A CN103163185 A CN 103163185A
- Authority
- CN
- China
- Prior art keywords
- temperature
- test
- resistance
- coil
- distribution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
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 the 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 larger due to copper, aluminium price differential, the 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 is for the outer general copper material that adopts of copper substation transformer, adopt aluminium at inner coil, if do not decompose coil, be difficult to identify.Substation transformer monomer capacity generally below 2000kVA, for reducing the oxidation of insulating oil, adopts all-sealed structure usually, causes larger difficulty for the judgement of coil material, the at present 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 that a kind of coil material detects principle and method just seems particularly urgent and important.
publication number CN102749342A discloses the harmless discrimination method of the non-solution body coil of a kind of substation transformer material, it is according to copper, steel, the difference of aluminium to the attenuation coefficient of X ray, utilize X ray that the non-substation transformer of disassembling under state is taken pictures, use the radiographic film density measurement of black and white densitometer to taking pictures, with the blackness value input computing machine of measuring, use the industrial radiographic film family curve, process and the different x-ray tube voltage copper that is stored in computing machine, steel, aluminium X ray attenuation coefficient-transillumination thickness curve calculates, comparison, the winding coil that determines substation transformer is aluminium or copper.Although this method can judge the material of substation transformer, method is complicated.
Summary of the invention
The objective of the invention is, for simply, effectively differentiating the material of distribution transforming coil, the invention provides a kind of comprehensive judging method of substation transformer material.
Technical scheme of the present invention is that the present invention can realize the Non-Destructive Testing of distribution transforming material in conjunction with distribution transforming fuel tank volume diagnostic method and two flow processs of temperature-coefficient of electrical resistance method.
The inventive method step is as follows:
(1) pass through 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 surpass conventional substation transformer oil box long-pending 30%, this test distribution transforming can judge tentatively that its coil is the transformer of aluminium;
(2) by the temperature coefficient test of Outside Heating Method, further judge the coil material, measure direct current resistance and the temperature of distribution transforming coil under different temperatures;
(3) test data is carried out error analysis and processing, suppress the error of generation in test, improve the measuring accuracy of temperature-coefficient of electrical resistance;
Its source of error is in two points: and the starting point of test (be reference point, R
0, t
0Deng) and the 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, can analyze improvement from test method;
For stochastic error, the method that can adopt data to process reduces error, namely adopts linear regression method that each resistance-temperature data is processed, and obtains direct current resistance and the temperature value of distribution transforming coil under different temperatures accurately;
(4) adopt linear regression method that each resistance-temperature data is processed, obtain the resistance temperature linearity curve, got by linear equation:
Wherein, a is the slope of straight line, and b is the intercept of straight line.
(5) the temperature-coefficient of electrical resistance K that calculates according to the temperature-coefficient of electrical resistance method judges whether there is aluminium in distribution transforming; If the K value is interval below 230, judge that the coil material is aluminium; Otherwise, judge that the coil material is copper material;
(6) if there is aluminium in temperature-coefficient of electrical resistance method magnetic test coil, can carry out on-the-spot suspended core disassembly experiment.
When the present invention adopts the temperature-coefficient of electrical resistance test of Outside Heating Method, employing substation transformer material detection Special constant temperature baking oven and precision are that the high precision instrument for measuring DC resistance of 0.2 grade is measured direct current resistance and the temperature of distribution transforming coil under different temperatures, 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
0Be cold-state resistance and temperature;
From
Can obtain the computing formula of K value in formula:
Obviously, as long as direct current resistance and the temperature of Measurement accuracy distribution transforming coil under different temperatures just can calculate the K value, thereby differentiate copper, aluminium material.Wherein to get 230 are critical points of differentiating distribution transforming coil material to K.If the K value is interval below 230, be judged to be aluminium; Otherwise, be judged to be copper material.Accurate measurement to accurate control, measurement and the direct current resistance of coil temperature in whole test is the key that the serviceability temperature Y-factor method Y is differentiated the distribution transforming material.
In order to improve the measuring accuracy of temperature-coefficient of electrical resistance, need test data is carried out error analysis and processing.For stochastic error, the method that can adopt data to process reduces error.
From
In can obtain the resistance of resistance R-temperature expression formula:
Can adopt like this linear regression method that each resistance-temperature data is processed, obtain a unified linear equation:
Adopt linear regression method that each resistance-temperature data is processed, obtain a unified linear equation:
Can ask for K value more accurately by the slope of straight line.
Beneficial effect of the present invention is: proposed the method for a kind of distribution transformer coils material Non-Destructive Testing, the method has been avoided carrying out on-the-spot suspended core disassembly experiment and has been caused the distribution transforming damage.Judge relative method and two testing processes of temperature-coefficient of electrical resistance method 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.
Description of drawings
Fig. 1 is to the front view of substation transformer dimensional measurement in volume diagnostic method of the present invention;
Fig. 2 is to the left view of 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
The present invention is described in detail below in conjunction with accompanying drawing.
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, at first the size indication of sampling observation transformer carried out the fuel tank cubing, concrete grammar is averaged for using tape measure respectively to measure length once in the upper and lower of substation transformer.If the fuel tank volume of test distribution transforming surpasses 30% of conventional distribution transforming, this test substation transformer can judge tentatively that its coil is the transformer of aluminium.
As shown in Fig. 3 distribution transformer coils material Non-Destructive Testing process block diagram, the substation transformer of the embodiment of the present invention is carried out the temperature coefficient test of Outside Heating Method.
Adopt the distribution transformer coils material to detect Special constant temperature baking oven and high precision instrument for measuring DC resistance in test, for improving the temperature-coefficient of electrical resistance measuring accuracy, need measurement data is carried out error analysis and processing, namely choose at several temperature in normal temperature to 90 a ℃ interval and test, direct current resistance by the measuring transformer high and low pressure side, analyze matched curve with the linear multi Return Law, draw the resistance temperature curve model, before this model has improved, distribution transforming coil temperature model is only chosen the degree of accuracy of 2 accounting temperature COEFFICIENT K.
Adopt the distribution transforming material to detect the Special constant temperature baking oven in test, its advantage is that coil temperature and oil temperature are basic identical, and thermal equilibrium is more easily realized, can obtain more exactly coil temperature by the test oil temperature.Because the temperature difference and the temperature fluctuation of circulation constant temperature baking oven are less, therefore only need to measure the data of normal temperature and two points in 90 ℃ of left and right, can calculate according to the temperature model of distribution transforming coil coil resistance temperature coefficient K value.
With reference to Fig. 4, the curve that draws by analyzing linear regression only needs the calculated curve slope can calculate temperature-coefficient of electrical resistance K value, basis for estimation: the K value is got 230 and is critical point, if the 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
| The winding group | Slope | Intercept | Coefficient correlation | The 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, the substation transformer material is tentatively judged; Compare with the distribution transforming of corresponding model, if the fuel tank volume of test substation transformer surpass conventional substation transformer oil box long-pending 30%, this test distribution transforming can judge tentatively that its coil is the transformer of aluminium;
(2) by the temperature coefficient test of Outside Heating Method, further judge the coil material, measure direct current resistance and the temperature of distribution transforming coil under different temperatures;
(3) test data is carried out error analysis and processing, suppress the error of generation 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 of test point, and the temperature of these two points and resistance measurement error all can be divided into droop and random deviation;
For droop, can analyze improvement from test method;
For stochastic error, the method that can adopt data to process reduces error, can adopt linear regression method that each resistance-temperature data is processed, and obtains direct current resistance and the temperature value of distribution transforming coil under different temperatures accurately;
(4) adopt linear regression method that each resistance-temperature data is processed, obtain the resistance temperature linearity curve, got 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 distribution transforming; If the K value is interval below 230, judge that the coil material is aluminium; Otherwise, judge that the coil material is copper material;
(6) if there is aluminium in temperature-coefficient of electrical resistance method magnetic test coil, can carry out on-the-spot suspended core disassembly experiment.
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 material detection Special constant temperature baking oven and precision are the high precision instrument for measuring DC resistance 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, choose at several temperature in normal temperature to 90 a ℃ interval and test, by measuring the direct current resistance of substation transformer high and low pressure side, analyze matched curve with the linear multi Return Law, draw the resistance temperature curve model, before this model has improved, the distribution transformer coils temperature model is only chosen the degree of accuracy of 2 accounting temperature COEFFICIENT K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310069426.8A CN103163185B (en) | 2013-03-05 | 2013-03-05 | Distribution transformer coil material nondestructive testing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310069426.8A CN103163185B (en) | 2013-03-05 | 2013-03-05 | Distribution transformer coil material nondestructive testing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103163185A true CN103163185A (en) | 2013-06-19 |
| CN103163185B CN103163185B (en) | 2014-12-31 |
Family
ID=48586447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310069426.8A Active CN103163185B (en) | 2013-03-05 | 2013-03-05 | Distribution transformer coil material nondestructive testing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103163185B (en) |
Cited By (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 |
| CN103604837A (en) * | 2013-11-28 | 2014-02-26 | 国家电网公司 | Distribution transformer coil material identification method |
| CN104458812A (en) * | 2014-11-20 | 2015-03-25 | 国家电网公司 | Method for recognizing coil material of distribution transformer |
| CN104502369A (en) * | 2014-08-08 | 2015-04-08 | 贵州电力试验研究院 | Three dimensional wound core oil immersed three-phase distribution transformer non-disassembly coil material identification method |
| CN104677927A (en) * | 2015-03-10 | 2015-06-03 | 国网四川省电力公司电力科学研究院 | Distribution transformer winding material detection system and method |
| CN104914310A (en) * | 2015-03-10 | 2015-09-16 | 国网四川省电力公司电力科学研究院 | Temperature-resistance curve acquisition apparatus of distribution transformer winding and method thereof |
| CN104931791A (en) * | 2014-03-20 | 2015-09-23 | 通用汽车环球科技运作有限责任公司 | Parameter Estimation In An Actuator |
| 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 |
| CN104991136A (en) * | 2015-06-29 | 2015-10-21 | 云南电网有限责任公司电力科学研究院 | Copper and aluminum winding transformer discrimination method based on capacity-volume ratio |
| 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 |
| 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 |
| CN108398459A (en) * | 2018-03-09 | 2018-08-14 | 武汉大学 | A kind of distribution oil change winding material orientation thermal resistance temperature curve recognition methods |
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002508585A (en) * | 1998-03-27 | 2002-03-19 | アライドシグナル・インコーポレイテッド | Dry transformer having a substantially rectangular resin-enclosed coil |
| CN101726515A (en) * | 2008-10-16 | 2010-06-09 | 淄博计保互感器研究所 | Tester and testing method for winding lead material of transformer |
| CN102749342A (en) * | 2012-07-20 | 2012-10-24 | 贵州电力试验研究院 | Non-destructive identification method for material of integral coil of distribution transformer |
-
2013
- 2013-03-05 CN CN201310069426.8A patent/CN103163185B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002508585A (en) * | 1998-03-27 | 2002-03-19 | アライドシグナル・インコーポレイテッド | Dry transformer having a substantially rectangular resin-enclosed coil |
| CN101726515A (en) * | 2008-10-16 | 2010-06-09 | 淄博计保互感器研究所 | Tester and testing method for winding lead material of transformer |
| CN102749342A (en) * | 2012-07-20 | 2012-10-24 | 贵州电力试验研究院 | Non-destructive identification method for material of integral coil of distribution transformer |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604837A (en) * | 2013-11-28 | 2014-02-26 | 国家电网公司 | Distribution transformer coil material identification method |
| 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 |
| CN104931791A (en) * | 2014-03-20 | 2015-09-23 | 通用汽车环球科技运作有限责任公司 | Parameter Estimation In An Actuator |
| 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 |
| CN104502369A (en) * | 2014-08-08 | 2015-04-08 | 贵州电力试验研究院 | Three dimensional wound core oil immersed three-phase distribution transformer non-disassembly coil material identification method |
| CN104458812A (en) * | 2014-11-20 | 2015-03-25 | 国家电网公司 | Method for recognizing coil material of distribution transformer |
| CN104677927A (en) * | 2015-03-10 | 2015-06-03 | 国网四川省电力公司电力科学研究院 | Distribution transformer winding material detection system and method |
| CN104914310A (en) * | 2015-03-10 | 2015-09-16 | 国网四川省电力公司电力科学研究院 | Temperature-resistance curve acquisition apparatus of distribution transformer winding and method thereof |
| 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 |
| CN104991136A (en) * | 2015-06-29 | 2015-10-21 | 云南电网有限责任公司电力科学研究院 | Copper and aluminum winding transformer discrimination method based on capacity-volume ratio |
| 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 |
| 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 |
| CN108398459A (en) * | 2018-03-09 | 2018-08-14 | 武汉大学 | A kind of distribution oil change winding material orientation thermal resistance temperature curve recognition methods |
| CN108398459B (en) * | 2018-03-09 | 2020-08-14 | 武汉大学 | Distribution oil variable winding material azimuth thermal resistance temperature curve identification method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103163185B (en) | 2014-12-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103163185B (en) | Distribution transformer coil material nondestructive testing method | |
| CN102749342B (en) | Non-destructive identification method for material of integral coil of distribution transformer | |
| CN104132736B (en) | Measuring method for non-intrusion type rapid temperature changes in direct-current excitation magnetic field | |
| CN105784763B (en) | A kind of induction thermal imagery non-destructive testing device based on magnetic core wound coil structure | |
| KR102179632B1 (en) | Method for evaluating the clogging of a heat exchanger | |
| CN109668506B (en) | Magnetic metal material thickness detection method based on eddy current steady-state characteristic | |
| TWI443346B (en) | Electrical appliance identification system and method | |
| CN202735281U (en) | Thermal conductivity tester | |
| CN105784959A (en) | Distribution transformer winding material detection method | |
| CN113465660B (en) | Non-contact temperature measurement and material component detection device and method based on conductivity | |
| CN104458149A (en) | Air preheater air leakage calculation method | |
| CN117235433B (en) | Metal surface crack quantitative evaluation method based on alternating current magnetic field | |
| CN109613111A (en) | A kind of gradient spiral vortex detection coil and its detection method | |
| WO2024000981A1 (en) | Internal penetrating type weak magnetic detection probe and working method therefor | |
| CN206891352U (en) | A kind of inspection frock for quickly examining positive and negative spatially spiral bend pipe | |
| CN105044202A (en) | Detection system and method based on saddle-shaped open binary channel vortex probe | |
| CN113156349B (en) | Method and device for measuring magneto-mechanical characteristics of material | |
| CN204882461U (en) | Body surface defect detection system based on shape of a saddle vortex probe | |
| CN104122032A (en) | Measuring method for quickly judging VIP vacuum degree | |
| Liu et al. | A novel detection method based on derivative for thermal defects of electrical equipment | |
| CN204882462U (en) | Eddy current inspection probe with shape of a saddle structure | |
| Wang et al. | Pulse eddy current testing thin metal thickness | |
| CN204902694U (en) | Aperture measuring device | |
| JP6466457B2 (en) | Method for quantitative prediction of steam generator plate contamination | |
| Sriratana et al. | Development of compatible induction coil with pure ac for hall effect sensor: A study on metal materials thickness |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |