CN108414568A - A kind of distribution transformer D/Y connections winding material thermoelectricity Curves Recognition method - Google Patents
A kind of distribution transformer D/Y connections winding material thermoelectricity Curves Recognition method Download PDFInfo
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- CN108414568A CN108414568A CN201810193461.3A CN201810193461A CN108414568A CN 108414568 A CN108414568 A CN 108414568A CN 201810193461 A CN201810193461 A CN 201810193461A CN 108414568 A CN108414568 A CN 108414568A
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- Prior art keywords
- winding
- data acquisition
- integrated apparatus
- winding material
- distribution transformer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
Abstract
The present invention relates to distribution transformer equipment non-destructive testing technologies, and in particular to a kind of distribution transformer D/Y connections winding material thermoelectricity Curves Recognition method is coupled winding terminals to D or Y and is sequentially ingressed into heating device and data acquisition integrated apparatus；The phase winding to be heated is selected, and opens corresponding channel on data acquisition integrated apparatus, then starts heating device；Under heated condition, pay attention to seeing whether that there are hot-spot phenomenons；Thermoelectricity curve of the thermoelectrical potential about the temperature difference is collected under the state of cooling, curve theory is linear, can comprehensive judgement winding material according to the distributed areas of curve and slope.The present invention can effectively detect winding material, have the characteristics that simple and efficient, accuracy is high and lossless to power equipment.
Description
Technical field
The invention belongs to distribution transformer equipment technical field of nondestructive testing more particularly to a kind of distribution transformer D/Y to join
Tie winding material thermoelectricity Curves Recognition method.
Background technology
Distribution transformer is large number of, there is very important status in Rural Power Distribution Network and urban power distribution network, with life
Work is closely bound up.In recent years, climbing up and up with copper processing, copper aluminium market price difference gradually widen, a small number of transformer production factories
Family works hard, there is the bad phenomenons of " replacing copper with aluminium " in the market, give distribution to obtain the profit of bigger on winding material
The actual motion of transformer, which is brought, to be seriously affected.
Currently, numerous studies, such as thermo-electric method, temperature-coefficient of electrical resistance method, x-ray method, data system have also been made in pertinent literature
The lossless detection methods such as meter method, frequency response method, digital eddy-current method, metal detection method, but do not obtain ideal when practice
Effect.
For being molded distribution transformer, winding is encapsulated among babinet or insulating materials, cannot be straight by naked eyes
Observation is connect, the model identification on nameplate is often different from reality material, and casing draws material and also tends to differ with winding material.
If winding material is using aluminum steel or copper-clad aluminum conductor, the connector to extend out still can connect copper material by copper aluminium welding method
Matter.Only with existing technology detection means, it is difficult to find materials variances from the conventional projects such as short circuit, zero load, insulation performance.For
The phenomenon that preventing " replacing copper with aluminium " from further developing into " adulterating ", increase efforts of investigation and prosecution is particularly necessary, identifies distribution in time
Transformer winding material is significant for improving security of distribution network.
Invention content
The object of the present invention is to provide a kind of methods that can effectively detect winding material, have simple and efficient, lossless standard
True feature.
To achieve the above object, the technical solution adopted by the present invention is a kind of distribution transformer D/Y connection windings material heat
Electric Curves Recognition method, includes the following steps：
Step 1 is sequentially ingressed into heating device and data acquisition integrated apparatus to D/Y connection winding terminals；
Step 2, the selection phase winding to be heated, and corresponding service aisle on data acquisition integrated apparatus is opened, then
Start heating device；
In step 3, heating process, the service aisle of data acquisition integrated apparatus is monitored required data；Work as fire end
When sub- temperature reaches temperature limit, heater stop heating；When entering the state of cooling, data acquisition integrated apparatus starts
Gathered data；
Step 4, the thermoelectrical potential drawn according to institute gathered data are sentenced about the distributed areas of the scatterplot curve graph of the temperature difference and slope
Determine winding material.
The invention has the advantages that the present invention is drawn out by the Simultaneous Monitoring and gathered data of multichannel complex data
Comprehensive judgement winding material is carried out in scatterplot curve graph of the thermoelectrical potential about the temperature difference, distributed areas and slope further according to curve.Not
In the case of destroying transformer device structure and insulation, the non-destructive testing to winding material can be realized, there is simple and efficient, lossless standard
True feature.
Description of the drawings
Fig. 1 is that one embodiment of the invention D/Y is coupled winding thermoelectricity wiring diagram；
Fig. 2 is that one embodiment of the invention D is coupled winding electrothermal circuit schematic diagram；
Fig. 3 is that one embodiment of the invention Y is coupled winding electrothermal circuit schematic diagram；
Fig. 4 is that one embodiment of the invention Dyn11 is coupled winding heat run thermoelectricity curve graph；
Fig. 5 is one embodiment of the invention distribution transformer winding material thermoelectricity Curves Recognition method flow diagram.
Specific implementation mode
Embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.
As shown in figure 5, the present embodiment is achieved through the following technical solutions, a kind of distribution transformer D/Y connections winding
Material thermoelectricity Curves Recognition method, specifically includes following steps：
S1. it is coupled winding terminals to D/Y and is sequentially ingressed into heating device and data acquisition integrated apparatus；
S2. the phase winding to be heated is selected, and opens corresponding channel on data acquisition integrated apparatus（At winding joint
Circular terminal and triangle terminal indicate pressure measurement terminal and warm terminal, pressure measurement terminal corresponding channel 1,3,5 to be taken to take Wen Duan respectively
Sub- corresponding channel 2,4,6）, then start heating device；
S3. in heating process, the service aisle of data acquisition integrated apparatus is monitored required data.When heating terminal
When temperature reaches temperature limit, heater stop heating.When entering the state of cooling, data acquisition integrated apparatus starts to adopt
Collection, device carry differential thermal calculation function and voltage gain function；
S4. according to the thermoelectrical potential that collects about the distributed areas of the scatterplot curve graph of the temperature difference and slope can comprehensive judgement around
Group material.
As shown in Figure 1, D/Y is coupled winding thermoelectricity wiring diagram mainly include heating device, data acquisition integrated apparatus and
PC.Heating device can rapidly and efficiently heat it by heating heating coil non-contact be socketed on terminal.Data are adopted
Integrated makeup is set with 6 channels, and the circular terminal and triangle terminal at winding joint indicate pressure measurement terminal and take respectively
Warm terminal, pressure measurement terminal corresponding channel 1,3,5 take warm terminal corresponding channel 2,4,6.PC can be imported by usb data capture card
The data of acquisition, and be correspondingly processed.
As shown in Figure 2 and Figure 3, D and Y is coupled winding electrothermal circuit schematic diagram and is simplified to actual electrothermal circuit.Such as figure
Shown in 2, for D is coupled winding, each phase winding is non-mutual indepedent in gatherer process（Include three-phase simultaneously in electrothermal circuit
Winding）；As shown in figure 3, for Y is coupled winding, each phase winding is also non-mutual indepedent in gatherer process（In electrothermal circuit
Include two phase windings simultaneously）.Winding is connected to copper bar and copper conducting rod, external voltmeter both ends respectively from inside to outside from end
Still use copper lead, in this way since, in entire electrothermal circuit, in addition to winding material do not know other than, remaining material is copper.
Need exist for clear two problems.
When：If the both ends of two different conductive materials are connected to form a complete circuit, then two kinds
The temperature difference of material contact can make to generate small DC voltage between entire circuit.Theoretically, when winding material is copper,
Only include a kind of metal material in circuit, not will produce apparent thermoelectrical potential；When winding material is aluminium, dissimilar metal and the temperature difference
Two kinds of conditions are met, therefore will produce apparent thermoelectrical potential.
Second is that：If being inserted into middle conductor between A, B conductor, as long as keeping middle conductor two-terminal temperature identical, then
To A, the total thermoelectrical potential for the electrothermal circuit that B is constituted does not have an impact.This, which is also institute's access voltmeter both ends, need to use copper lead
The reason of.
A kind of distribution transformer D/Y connections winding material thermoelectricity Curves Recognition method, specifically includes following steps：
1）, according to Fig. 1 to D/Y be coupled winding terminals and be sequentially ingressed into heating device and data and acquire integrated apparatus；
Specifically, being coupled winding for D, pay attention to disconnecting the short-circuit line at non-heated phase winding tap.
2）, selection the phase winding to be heated, and open data acquisition integrated apparatus on corresponding channel（Winding joint
The circular terminal and triangle terminal at place indicate pressure measurement terminal and warm terminal, pressure measurement terminal corresponding channel 1,3,5 are taken to take temperature respectively
Terminal corresponding channel 2,4,6）, then start heating device；
Specifically, including that a pressure measurement terminal and one take warm terminal at each terminal：Pressure measurement terminal must use brass bolt
Fastening, far from hot spot（Not heated temperature influences）；It takes warm terminal that the mode for attaching thermocouple probe can be used, pays attention to adding used outside insulated
Adhesive tape.
3）, in heating process, the service aisle of data acquisition integrated apparatus is monitored required data.Work as fire end
When sub- temperature reaches temperature limit, heater stop heating.When entering the state of cooling, data acquisition integrated apparatus starts
Acquisition, device carry differential thermal calculation function and voltage gain function；
For temperature limit：National standard " GB 1094.2-2003 power transformer part 2s：The temperature of liquid soaking transformer
Liter " has made winding temperature rise of hot spot the regulation of 78K；National standard " the 11st part dry type of GBT 1094.11-2007 power transformers
Transformer " has made winding average temperature rising limit value of the F grades of dry-type transformers under rated current the regulation of 100K；Newest publication
The temperature limit of fuel tank and body structure surface is made in the notice of the 7 class standard technique specification such as new edition 10kV distribution transformers
The regulation of 80K.To sum up, the threshold value for taking 60K to be set as heating device after nargin is adjusted.
4）, can comprehensive judgement about the distributed areas of the scatterplot curve graph of the temperature difference and slope according to the thermoelectrical potential that collects
Winding material.
Specifically, with model machine pilot survey a bench-type number is unknown, bind mode for Dyn11 dry-type distribution transformer
C（c）For phase winding, the thermoelectricity curve graph of high-pressure side and low-pressure side is as shown in Figure 4.
The result of actual measurement shows that low-pressure side winding material is copper, high-pressure side winding material is then aluminium.To be verified, after to C
（c）Phase winding is dismantled, and as a result shows that C phase windings are aluminum steel coiling, c phase windings are copper foil coiling.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
Although describing the specific implementation mode of the present invention above in association with attached drawing, those of ordinary skill in the art should
Understand, these are merely examples, and various deformation or modification can be made to these embodiments, without departing from the original of the present invention
Reason and essence.The scope of the present invention is only limited by the claims that follow.
Claims (1)
1. a kind of distribution transformer D/Y is coupled winding material thermoelectricity Curves Recognition method, characterized in that include the following steps：
Step 1 is sequentially ingressed into heating device and data acquisition integrated apparatus to D/Y connection winding terminals；
Step 2, the selection phase winding to be heated, and corresponding service aisle on data acquisition integrated apparatus is opened, then
Start heating device；
In step 3, heating process, the service aisle of data acquisition integrated apparatus is monitored required data；Work as fire end
When sub- temperature reaches temperature limit, heater stop heating；When entering the state of cooling, data acquisition integrated apparatus starts
Gathered data；
Step 4, the thermoelectrical potential drawn according to institute gathered data are sentenced about the distributed areas of the scatterplot curve graph of the temperature difference and slope
Determine winding material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810193461.3A CN108414568A (en) | 2018-03-09 | 2018-03-09 | A kind of distribution transformer D/Y connections winding material thermoelectricity Curves Recognition method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810193461.3A CN108414568A (en) | 2018-03-09 | 2018-03-09 | A kind of distribution transformer D/Y connections winding material thermoelectricity Curves Recognition method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105973934A (en) * | 2016-07-05 | 2016-09-28 | 国网重庆市电力公司电力科学研究院 | Intelligent diagnosis device and method for transformer winding material |
| CN205808974U (en) * | 2016-07-05 | 2016-12-14 | 国网重庆市电力公司电力科学研究院 | A kind of Transformer Winding material intelligent diagnostics device |
| CN107655940A (en) * | 2017-09-18 | 2018-02-02 | 国网重庆市电力公司电力科学研究院 | A kind of Transformer Winding wood properly test equipment and system |
-
2018
- 2018-03-09 CN CN201810193461.3A patent/CN108414568A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105973934A (en) * | 2016-07-05 | 2016-09-28 | 国网重庆市电力公司电力科学研究院 | Intelligent diagnosis device and method for transformer winding material |
| CN205808974U (en) * | 2016-07-05 | 2016-12-14 | 国网重庆市电力公司电力科学研究院 | A kind of Transformer Winding material intelligent diagnostics device |
| CN107655940A (en) * | 2017-09-18 | 2018-02-02 | 国网重庆市电力公司电力科学研究院 | A kind of Transformer Winding wood properly test equipment and system |
Non-Patent Citations (3)
| Title |
|---|
| 何良等: "一种用于配电变压器绕组材质诊断的新方法", 《四川电力技术》 * |
| 叶明超: "《自动检测与转换技术（第2版）》", 31 January 2017, 北京理工大学出版社 * |
| 杜林等: "基于热电效应的变压器绕组材质鉴别方法", 《高电压技术》 * |
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Application publication date: 20180817 |