CN108398459A - A kind of distribution oil change winding material orientation thermal resistance temperature curve recognition methods - Google Patents
A kind of distribution oil change winding material orientation thermal resistance temperature curve recognition methods Download PDFInfo
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- CN108398459A CN108398459A CN201810193500.XA CN201810193500A CN108398459A CN 108398459 A CN108398459 A CN 108398459A CN 201810193500 A CN201810193500 A CN 201810193500A CN 108398459 A CN108398459 A CN 108398459A
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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
- G01N25/72—Investigating presence of flaws
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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Abstract
The present invention relates to distribution transformer equipment non-destructive testing technologies, and in particular to a kind of distribution oil change winding material orientation thermal resistance temperature curve recognition methods, including grouping are layouted, and become box top, front and the left side in oil plants three groups of points successively；Oil is completed to become short-circuit method wiring and access multichannel temperature measuring device；Temperature rise test is carried out, and monitors each point temperature variations；When each point temperature tends towards stability, rapid deenergization simultaneously accesses the straight resistance measuring device measurement straight resistance value of phase winding to be measured, measures at regular intervals primary；The oily variable resistance temperature profile in the case of three kinds of top surface, front and the left side is made based on orientation estimation method, divides situation discussion, winding material is obtained after comprehensive judgement.This method can effectively detect winding material, have the characteristics that economical conventional, lossless accurate.
Description
Technical field
The invention belongs to distribution transformer equipment technical field of nondestructive testing more particularly to a kind of distribution oil to become winding material
Orientation thermal resistance temperature curve recognition methods.
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.
Pertinent literature has also been made numerous studies, such as thermo-electric method, temperature-coefficient of electrical resistance method, x-ray method, statistical approach,
The lossless detection methods such as frequency response method, digital eddy-current method, metal detection method.The temperature-coefficient of electrical resistance method being just most widely used
For, there is the defined formula for temperature-coefficient of electrical resistance to obtain a variety of method of discrimination after carrying out a variety of transformation, such as establishes resistance temperature
Phasing meter is spent to compare the straight resistance value of winding under different temperatures and ask down temperature-coefficient of electrical resistance and take certain nargin space, but real
Border does not obtain ideal effect when using.
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 lossless accurate methods for detecting winding material of energy.
To achieve the above object, the technical solution adopted by the present invention is：A kind of distribution oil change winding material orientation thermal resistance temperature
It writes music line recognition methods, includes the following steps：
Step 1, respectively oil becomes box top, front and the left side are grouped layout successively；
Step 2 completes oil change short-circuit method wiring and accesses multichannel temperature measuring device；
Step 3 carries out temperature rise test, and monitors each point temperature variations；
Step 4, when each point temperature tends towards stability, deenergization simultaneously accesses straight resistance measuring device, measures phase winding to be measured
Straight resistance value measures primary at regular intervals；
Step 5, based on orientation estimation method make it is fuel-displaced change box top, front and the left side oily variable resistance temperature profile,
Judge that distribution oil becomes winding material according to oily variable resistance temperature profile.
The beneficial effects of the invention are as follows：Follow national standard with short-circuit method to oil become carry out temperature rise test on the basis of, subtract
The time required to having lacked experiment, i.e., without waiting for temperature complete stability, it need to only take whole temperature of layouting and rise variation faster that time.
A kind of novel non-comprehensive estimating and measuring method for winding temperature is proposed, only in the case of three kinds of top surface, front and the left side
Two kinds or more can provide judgement when meeting the requirements, comprehensive relatively strong, can reduce erroneous judgement.It is hot straight rationally to extend winding
The time of measuring (being 10min described in national standard) of resistance, has on the one hand expanded data sample, has on the other hand been improved in fitting a straight line
Data user rate.
Description of the drawings
Fig. 1 is that one embodiment of the invention oil becomes short-circuit temperature rise test wiring diagram；
Fig. 2 is one embodiment of the invention oil variable resistance temperature acquisition wiring diagram；
Fig. 3 is that one embodiment of the invention distribution oil becomes winding material orientation thermal resistance temperature curve recognition methods flow chart；
Fig. 4 (a) is the top surface thermal resistance temperature foh curve that one embodiment of the invention estimates method based on orientation；
Fig. 4 (b) is the positive thermal resistance temperature foh curve that one embodiment of the invention estimates method based on orientation；
Fig. 4 (c) is the left side thermal resistance temperature foh curve that one embodiment of the invention estimates method based on orientation.
Specific implementation mode
Embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.
The present embodiment is achieved through the following technical solutions, a kind of distribution oil change winding material orientation thermal resistance temperature curve
Recognition methods specifically includes following steps：
S1. grouping is layouted, and becomes box top (adding phase winding tap points to be measured), front (additional back side upper point) in oil
Three groups of points are planted successively with the left side (additional right side central point)；
S2. oil is completed to become short-circuit method wiring and access multichannel temperature measuring device；
S3. temperature rise test is carried out, and monitors each point temperature variations；
S4. when each point temperature tends towards stability, rapid deenergization simultaneously accesses straight resistance measuring device measurement phase winding to be measured
Straight resistance value measures primary at regular intervals；
S5. make the oily variable resistance temperature in the case of three kinds of fuel-displaced change box top, front and the left side based on orientation estimation method
Curve graph divides situation discussion, winding material is obtained after comprehensive judgement.
When it is implemented, having carried out temperature as shown in Figure 1, becoming to the oil of model S (L) B11-M-200/10 with short-circuit method
It rises and tests, pressurize in high-pressure side, (copper bar not connect too tightly low-pressure side, straight convenient for later stage dismounting survey using copper bar progress short circuit
Resistance).External 380V power frequencies three-phase alternating-current supply, and gradually boosted by three phase voltage regulating device.Three-Phase Transformer voltage and current is surveyed
Amount device can be monitored each phase voltage of institute's survey transformer and electric current during Wen Sheng, avoid the occurrence of asymmetrical voltage or short circuit
The excessive situation of electric current.Binding post " a b c " is indicated by output voltage regulator input voltage to tester, binding post " A B C "
It indicates by tester output end input current to tested high voltage side of transformer, binding post " UA UB UC" indicate to be exported by tester
Hold input voltage to tested high voltage side of transformer.Wiring where removing three-phase air switch, the experiment need 6 pressure-wires and 3
Root current line.
As shown in Fig. 2, in the temperature-fall period after completing temperature rise test, it need to be to the temperature and low-pressure side b of institute's cloth each point
The hot resistance of phase winding measures acquisition.Each point temperature is surveyed by the way of attaching thermocouple probe and adding used outside insulated adhesive tape
Amount, and acquired by multi-channel temperature acquisition device, precision is 0.05 DEG C, and resolution ratio is 0.01 DEG C.The hot resistance of b phase windings
It is measured by the way of accessing direct current resistance m easurem ent device, the mode of connection is four-wire system, and inside is voltage pole, and outside is electricity
Pole is flowed, the p-wire and connection clamp of corresponding line footpath size, accuracy 0.2% is respectively adopted, resolution ratio is 1 μ Ω.To make to connect
Line chart is very clear, and the acquisition wiring of top surface point (black dot) is only depicted in figure, is needed during actual measurement plus positive millet cake (just
Triangle dot) with the acquisition wiring of left side point (inverted triangle dot).
As shown in figure 3, a kind of distribution oil becomes the orientation thermal resistance temperature curve recognition methods of winding material, following step is specifically included
Suddenly：
1. grouping is layouted, become box top (adding phase winding tap points to be measured), front (additional back side upper point) in oil
Three groups of points are planted successively with the left side (additional right side central point)；
Specifically, top surface, which is layouted, refers to the additional winding joint point in 3 points of left, center, right of box top, front, which is layouted, refers to babinet patch
There is the additional upper rear portion point of 3 points of nameplate one side upper, middle and lower, the left side, which is layouted, to be referred in the middle part of 3 points of additional right sides of babinet left side upper, middle and lower
The accurate sticking position of point, each point refers to Fig. 2.
2. completing oil to become short-circuit method wiring and access multichannel temperature measuring device；
Specifically, pressurizeing in high-pressure side, low-pressure side carries out short circuit using copper bar, and copper bar not connect too tightly, be convenient for the later stage
Straight resistance is surveyed in dismounting.External 380V power frequencies three-phase alternating-current supply, and gradually boosted by three-phase contact type voltage regulator.
S3. temperature rise test is carried out, and monitors each point temperature variations；
Specifically, first applying maximum total losses in high-pressure side, on high-tension side test voltage U and test current I divide at this time
It can not be calculated by formula (1) and formula (2)：
It is down to rated current after each point Wen Sheng tends towards stability, then by test current, waits for that each point Wen Sheng tends towards stability again
Stop heating afterwards.The purpose stablized for the first time is that the heating rate of quickening winding, second of purpose stablized are to make to be measured
Transformer is operated under nominal current conditions, high current is avoided to cause to damage to it, while being carried out convenient for the later stage and hot directly being hindered
Measure work.
4. when each point temperature tends towards stability, rapid deenergization simultaneously accesses straight resistance measuring device to measure phase winding to be measured straight
Resistance value measures primary at regular intervals；
Specifically, to quickly access direct resistance metering instrument, optimal measuring time is avoided missing, certain dismounting skill need to be grasped
Ingeniously：Put on adiabatic gloves first and remove short-circuiting copper bar under the condition of high temperature, every section of copper bar need to only tear one end open, as long as ensure three-phase around
The external connection of group disconnects, and then accesses direct resistance metering instrument.
5. the oily variable resistance temperature in the case of making three kinds of fuel-displaced change box top, front and the left side based on orientation estimation method is bent
Line chart divides situation discussion, winding material is obtained after comprehensive judgement.
Enumerated herein to model be respectively SB11-M-200/10 and SLB11-M-200/10 two shapes it is equivalent oil become
The test examples of progress, the thermal resistance temperature curve of both experiment gained is as shown in figure 4, fitting function formula is respectively：
Top surface：
RCu=0.01714T+3.152 (3)
RAl=0.01906T+3.012 (4)
Front：
RCu=0.02256T+2.958 (5)
RAl=0.02247T+2.930 (6)
The left side：
RCu=0.02417T+2.90 (7)
RAl=0.02527T+2.896 (8)
For actual field is in application, the distribution oil unknown to certain winding material becomes, method experiment can be estimated according to orientation
Obtain three thermal resistance temperature curves, substitute into respectively it is corresponding in the case of discuss, can be provided when two kinds and case above are met the requirements
Judgement：Be biased to copper become curved line number >=2 when can determine that winding material as copper, be otherwise aluminium.
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 oil becomes the orientation thermal resistance temperature curve recognition methods of winding material, characterized in that include the following steps：
Step 1, respectively oil becomes box top, front and the left side are grouped layout successively；
Step 2 completes oil change short-circuit method wiring and accesses multichannel temperature measuring device；
Step 3 carries out temperature rise test, and monitors each point temperature variations；
Step 4, when each point temperature tends towards stability, deenergization simultaneously accesses straight resistance measuring device, measures phase winding to be measured and directly hinders
Value measures primary at regular intervals；
Step 5, based on orientation estimation method make it is fuel-displaced change box top, front and the left side oily variable resistance temperature profile, according to
Oily variable resistance temperature profile judgement distribution oil becomes winding material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810193500.XA CN108398459B (en) | 2018-03-09 | 2018-03-09 | Distribution oil variable winding material azimuth thermal resistance temperature curve identification method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810193500.XA CN108398459B (en) | 2018-03-09 | 2018-03-09 | Distribution oil variable winding material azimuth thermal resistance temperature curve identification method |
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| CN108398459B CN108398459B (en) | 2020-08-14 |
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| 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 |
| CN106353370A (en) * | 2016-09-12 | 2017-01-25 | 国网天津市电力公司 | Device and method for nondestructively detecting materials for windings of power distribution transformers |
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