CN106404844A - Transformer winding material identification method - Google Patents
Transformer winding material identification method Download PDFInfo
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- CN106404844A CN106404844A CN201610736363.0A CN201610736363A CN106404844A CN 106404844 A CN106404844 A CN 106404844A CN 201610736363 A CN201610736363 A CN 201610736363A CN 106404844 A CN106404844 A CN 106404844A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
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Abstract
The invention belongs to the field of electrical equipment, relates to a transformer, and especially relates to a transformer winding material identification method. The transformer winding material identification method comprises following valid procedures: a, temperature increasing is carried out, wherein short circuit of the high voltage side of the transformer is carried out, voltage of the low voltage side of the transformer is increased until electric current is increased to 115% of the rated current, so that the temperature of upper layer oil in the transformer is increased to 80 DEG C rapidly, and then heating is stopped; b, when the temperature of oil inside the transformer and the temperature of oil outside the transformer are basically equal, the direct current resistance values of the transformer high voltage side are measured at different transformer temperature stages so as to obtain resistance values of the transformer at different temperatures; and c, formula TCR=(R2-R1)/(R1*delta T) is adopted to calculate resistance temperature coefficients at different temperature differences, the average value of the resistance temperature coefficients is obtained, and is compared with known metal electrical resistivities and data in temperature coefficient tables of the corresponding metal so as to identify the material of the winding in the transformer. According to the transformer winding material identification method, the material of the winding in the transformer is identified without unsealing the transformer, and the legitimate rights and interests of consumers are protected.
Description
Technical field
The invention belongs to field of electrical equipment, it is related to transformator, more particularly, to a kind of Transformer Winding material authentication method.
Background technology
Transformator is the device changing alternating voltage using the principle of electromagnetic induction, and main member is primary coil, secondary
Level coil and iron core (magnetic core).Major function has:Voltage transformation, current transformation, impedance conversion, isolation, voltage stabilizing (magnetic saturation transformation
Device) etc..Continue health high speed development with China's economic, electricity needs maintains sustained and rapid growth, and transformator is as power industry
Visual plant, the fast development of China Power construction has driven the development of Chinese Transformer-Manufacturing Trade.
Critical piece high-low pressure winding is typically coiled into using insulated copper wire or aluminum steel.Wherein copper coil transformer cost higher but
The electric properties such as its overload, anti-short circuit capability are substantially better than aluminium coil transformer, and the life-span is also longer than aluminium coil transformer.Due to aluminium core
Transformator price will have compared with high performance-price ratio less than copper coil transformer more than 1/3rd, and part use environment also can meet use
Require, so national regulation, the winding of mesh first two material all can use, but transformator nameplate must mark.Such as S11 series
Transformator, aluminium core should be designated as SL11.Due to the two price differ larger, therefore, individually bad businessman in order to try to gain bad just
When interests are often adulterated, aluminium coil transformer is labeled as copper coil transformer and sells, had a strong impact on consumer's just rights and interests,
Also have undesirable effect to power grid security.Because transformator is Seal Design, existing experimental project cannot judge its winding material.
Content of the invention
The present invention cannot differentiate the technical problem of its winding material for above-mentioned because of transformator Seal Design, proposes one
Kind reasonable in design, method is simple and need not break a seal and can differentiate accurate Transformer Winding material authentication method.
In order to achieve the above object, the technical solution used in the present invention is, a kind of Transformer Winding material authentication method, bag
Include following effective procedure：
A, intensification：By high voltage side of transformer short circuit, power up in step down side and be depressed into the 115% of its rated current, make
In transformator, upper strata oil is rapidly heated to after 80 DEG C, stops heating；
B, after oil temperature basis equalization inside and outside transformator, in transformator different temperatures phase measuring high voltage side of transformer direct current
Resistance, obtains the resistance value under transformator different temperatures；
C, according to formula TCR=(R2-R1) ÷ (R1. Δ T), calculate temperature-coefficient of electrical resistance under the different temperature difference, then will
The temperature-coefficient of electrical resistance of gained is averaged, and then carries out with the data in existing metallic resistance rate and its temperature coefficient form
Contrast, and then distinguish winding material in transformator, wherein, R1, R2 are the resistance value of high voltage side of transformer under different temperatures, Δ T
For measuring the temperature approach of the temperature of R1 and R2, TCR is temperature-coefficient of electrical resistance.
Preferably, in described b step, measuring transformer high-pressure side is at 80 DEG C, 70 DEG C, 60 DEG C, 50 DEG C, 40 DEG C, 30 DEG C
In resistance, appoint take the resistance at wherein 5 temperature to be calculated.
Preferably, in described step c, for calculate 40 DEG C～50 DEG C, 50 DEG C～60 DEG C, 60 DEG C～70 DEG C, 70 DEG C～
Temperature-coefficient of electrical resistance under 80 DEG C and 40 DEG C～80 DEG C temperature difference.
Preferably, in described b step, being measured using electric bridge or DCR of Transformer measuring instrument.
Preferably, in described b step, the resolution of described electric bridge or DCR of Transformer measuring instrument is less than 0.01
μ Ω, precision is greater than 0.2%.
Compared with prior art, advantages of the present invention and good effect are,
1st, the present invention passes through to provide a kind of Transformer Winding material authentication method, in the feelings guaranteeing that transformator sealing is not opened
Under condition, the temperature-coefficient of electrical resistance using metal metal in the range of 0～100 DEG C is substantially constant, and this characteristic to know pressure
Device winding material, thus protecting consumer's just rights and interests, also provides guarantee to power grid security, and meanwhile, the present invention provides
Authentication method is identified, convenient to carry out, qualification time is short, identification result is accurate, and suitable large-scale promotion uses.
Specific embodiment
In order to be more clearly understood that the above objects, features and advantages of the present invention, with reference to embodiment to this
Bright it is described further.It should be noted that in the case of not conflicting, the feature in embodiments herein and embodiment can
To be mutually combined.
Elaborate a lot of details in the following description in order to fully understand the present invention, but, the present invention also may be used
To implement using different from other modes described here, therefore, the present invention is not limited to the concrete of description described below
The restriction of embodiment.
Embodiment 1, the present embodiment provides a kind of Transformer Winding material authentication method：
First by high voltage side of transformer short circuit, power up the 115% (transformator being depressed into its rated current in step down side
Over loading 15%, it is allowed to the short time is run, is now equivalent to transformator in slight overload operation), the purpose of do so, energy
So that upper strata oil in transformator is rapidly heated, after upper strata oil is warming up to 80 DEG C in transformator, stop heating.
After waiting a moment 10 minutes, after oil temperature basis equalization inside and outside transformator, in transformator different temperatures phase measuring transformation
Device high-pressure side D.C. resistance, obtains the D.C. resistance that the resistance value metering system under transformator different temperatures can refer to transformator
Test method, is measured using electric bridge or DCR of Transformer measuring instrument, and resolution is less than 0.01 μ Ω, and precision is big
In 0.2%.In the present embodiment, resistance in 80 DEG C, 70 DEG C, 60 DEG C, 50 DEG C, 40 DEG C, 30 DEG C for the measuring transformer high-pressure side,
In the present embodiment, described temperature, refer to the oil temperature in transformator, because oil temperature and winding temperature are essentially identical, even if having
Error, because of measurement is temperature difference, and in temperature-fall period, internal-external temperature difference gradient is essentially identical, also has substantially no effect on effect.
Then according to formula TCR=(R2-R1) ÷ (R1. Δ T), calculate temperature-coefficient of electrical resistance under the different temperature difference, this is public
Formula is to calculate the formula of mean temperature coefficient of resistance, therefore in the present embodiment, its principle is not described, meanwhile, in this reality
Apply in example, for calculating 40 DEG C～50 DEG C, 50 DEG C～60 DEG C, 60 DEG C～70 DEG C, 70 DEG C～80 DEG C and 40 DEG C～80 DEG C temperature difference
Under temperature-coefficient of electrical resistance, then the temperature-coefficient of electrical resistance of gained is averaged, finally, according to the numerical value calculating with existing
Metallic resistance rate and its temperature coefficient form in data contrasted, and then distinguish winding material in transformator, wherein,
R1, R2 are the resistance value of high voltage side of transformer under different temperatures, and Δ T is the temperature approach of the temperature of measurement R1 and R2, and TCR is resistance
Temperature coefficient.
Experiment：After being used according to the authentication method that embodiment 1 provides, 38 more suspicious transformators are surveyed
Examination, judges wherein 12 as palming off copper coil transformer, accuracy rate 95%.
Embodiment 2, the present embodiment provides a kind of Transformer Winding material authentication method：
First by high voltage side of transformer short circuit, power up the 115% (transformator being depressed into its rated current in step down side
Over loading 15%, it is allowed to the short time is run, is now equivalent to transformator in slight overload operation), the purpose of do so, energy
So that upper strata oil in transformator is rapidly heated, after upper strata oil is warming up to 90 DEG C in transformator, stop heating.
After waiting a moment 10 minutes, after oil temperature basis equalization inside and outside transformator, in transformator different temperatures phase measuring transformation
Device high-pressure side D.C. resistance, obtains the D.C. resistance that the resistance value metering system under transformator different temperatures can refer to transformator
Test method, is measured using electric bridge or DCR of Transformer measuring instrument, and resolution is less than 0.01 μ Ω, and precision is big
In 0.2%.In the present embodiment, measuring transformer high-pressure side is in 90 DEG C, 80 DEG C, 70 DEG C, 60 DEG C, 50 DEG C, 40 DEG C, 30 DEG C
Resistance, choose wherein 90 DEG C, 80 DEG C, 70 DEG C, 60 DEG C, 50 DEG C of resistance value calculated, in the present embodiment, described temperature
Degree, refers to the oil temperature in transformator, and because oil temperature and winding temperature are essentially identical, even if there being error, because of measurement is temperature difference,
In temperature-fall period, internal-external temperature difference gradient is essentially identical, also has substantially no effect on effect.
Then according to formula TCR=(R2-R1) ÷ (R1. Δ T), calculate temperature-coefficient of electrical resistance under the different temperature difference, this is public
Formula is to calculate the formula of mean temperature coefficient of resistance, therefore in the present embodiment, its principle is not described, meanwhile, in this reality
Apply in example, for calculating 50 DEG C～60 DEG C, 60 DEG C～70 DEG C, 70 DEG C～80 DEG C, 80 DEG C～90 DEG C and 50 DEG C～90 DEG C temperature difference
Under temperature-coefficient of electrical resistance, then the temperature-coefficient of electrical resistance of gained is averaged, finally, according to the numerical value calculating with existing
Metallic resistance rate and its temperature coefficient form in data contrasted, and then distinguish winding material in transformator, wherein,
R1, R2 are the resistance value of high voltage side of transformer under different temperatures, and Δ T is the temperature approach of the temperature of measurement R1 and R2, and TCR is resistance
Temperature coefficient.
Experiment：After being used according to the authentication method that embodiment 2 provides, 40 more suspicious transformators are surveyed
Examination, judges wherein 15 as palming off copper coil transformer, accuracy rate 92%.
Embodiment 3, the present embodiment provides a kind of Transformer Winding material authentication method：
First by high voltage side of transformer short circuit, power up the 115% (transformator being depressed into its rated current in step down side
Over loading 15%, it is allowed to the short time is run, is now equivalent to transformator in slight overload operation), the purpose of do so, energy
So that upper strata oil in transformator is rapidly heated, after upper strata oil is warming up to 70 DEG C in transformator, stop heating.
After waiting a moment 10 minutes, after oil temperature basis equalization inside and outside transformator, in transformator different temperatures phase measuring transformation
Device high-pressure side D.C. resistance, obtains the D.C. resistance that the resistance value metering system under transformator different temperatures can refer to transformator
Test method, is measured using electric bridge or DCR of Transformer measuring instrument, and resolution is less than 0.01 μ Ω, and precision is big
In 0.2%.In the present embodiment, resistance in 70 DEG C, 60 DEG C, 50 DEG C, 40 DEG C, 30 DEG C, 20 DEG C for the measuring transformer high-pressure side,
Choose wherein 70 DEG C, 60 DEG C, 40 DEG C, 40 DEG C, 30 DEG C of resistance value calculated, in the present embodiment, described temperature, refer to
Oil temperature in transformator, because oil temperature and winding temperature are essentially identical, even if there being error, because of measurement is temperature difference, lowers the temperature
In journey, internal-external temperature difference gradient is essentially identical, also has substantially no effect on effect.
Then according to formula TCR=(R2-R1) ÷ (R1. Δ T), calculate temperature-coefficient of electrical resistance under the different temperature difference, this is public
Formula is to calculate the formula of mean temperature coefficient of resistance, therefore in the present embodiment, its principle is not described, meanwhile, in this reality
Apply in example, for calculating 30 DEG C～40 DEG C, 40 DEG C～50 DEG C, 50 DEG C～60 DEG C, 60 DEG C～70 DEG C and 30 DEG C～70 DEG C temperature difference
Under temperature-coefficient of electrical resistance, then the temperature-coefficient of electrical resistance of gained is averaged, finally, according to the numerical value calculating with existing
Metallic resistance rate and its temperature coefficient form in data contrasted, and then distinguish winding material in transformator, wherein,
R1, R2 are the resistance value of high voltage side of transformer under different temperatures, and Δ T is the temperature approach of the temperature of measurement R1 and R2, and TCR is resistance
Temperature coefficient.
Experiment：After being used according to the authentication method that embodiment 2 provides, 40 more suspicious transformators are surveyed
Examination, judges wherein 12 as palming off copper coil transformer, accuracy rate 86%.
From the point of view of the experimental result to embodiment 1,2,3, in the present embodiment, when warming temperature is to 80 DEG C, the standard of identification
Really rate highest.
The above, be only presently preferred embodiments of the present invention, is not the restriction that the present invention is made with other forms, appoints
What those skilled in the art possibly also with the disclosure above technology contents changed or be modified as equivalent variations etc.
Effect embodiment is applied to other fields, but every without departing from technical solution of the present invention content, according to the technical spirit of the present invention
Any simple modification, equivalent variations and the remodeling that above example is made, still falls within the protection domain of technical solution of the present invention.
Claims (5)
1. a kind of Transformer Winding material authentication method is it is characterised in that include following effective procedure：
A, intensification：By high voltage side of transformer short circuit, power up in step down side and be depressed into the 115% of its rated current, make transformation
In device, upper strata oil is rapidly heated to after 80 DEG C, stops heating；
B, after oil temperature basis equalization inside and outside transformator, in transformator different temperatures phase measuring high voltage side of transformer unidirectional current
Resistance, obtains the resistance value under transformator different temperatures；
C, according to formula TCR=(R2-R1) ÷ (R1. Δ T), calculate temperature-coefficient of electrical resistance under the different temperature difference, then by gained
Temperature-coefficient of electrical resistance average, then with existing metallic resistance rate and its temperature coefficient form in data carry out right
Than, and then distinguish winding material in transformator, wherein, R1, R2 are the resistance value of high voltage side of transformer under different temperatures, and Δ T is
The temperature approach of the temperature of measurement R1 and R2, TCR is temperature-coefficient of electrical resistance.
2. Transformer Winding material authentication method according to claim 1 is it is characterised in that in described b step, measurement becomes
Resistance in 80 DEG C, 70 DEG C, 60 DEG C, 50 DEG C, 40 DEG C, 30 DEG C for the depressor high-pressure side, appoints and takes the resistance at wherein 5 temperature to carry out
Calculate.
3. Transformer Winding material authentication method according to claim 2 is it is characterised in that in described step c, by based on
Calculate the resistance temperature system under 40 DEG C～50 DEG C, 50 DEG C～60 DEG C, 60 DEG C～70 DEG C, 70 DEG C～80 DEG C and 40 DEG C～80 DEG C temperature difference
Number.
4. Transformer Winding material authentication method according to claim 1 is it is characterised in that in described b step, using electricity
Bridge or DCR of Transformer measuring instrument measure.
5. Transformer Winding material authentication method according to claim 4 is it is characterised in that in described b step, described electricity
The resolution of bridge or DCR of Transformer measuring instrument is less than 0.01 μ Ω, and precision is greater than 0.2%.
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Cited By (2)
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|---|---|---|---|---|
| CN108267489A (en) * | 2017-12-26 | 2018-07-10 | 华侨大学 | The judgment method of dry change winding material based on metal material temperature-coefficient of electrical resistance |
| CN113884778A (en) * | 2021-10-29 | 2022-01-04 | 浙江华电器材检测研究院有限公司 | Transformer winding parameter identification method based on high-frequency excitation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108267489A (en) * | 2017-12-26 | 2018-07-10 | 华侨大学 | The judgment method of dry change winding material based on metal material temperature-coefficient of electrical resistance |
| CN108267489B (en) * | 2017-12-26 | 2020-09-04 | 华侨大学 | Method for judging material quality of dry-variable winding based on resistance temperature coefficient of metal material |
| CN113884778A (en) * | 2021-10-29 | 2022-01-04 | 浙江华电器材检测研究院有限公司 | Transformer winding parameter identification method based on high-frequency excitation |
| CN113884778B (en) * | 2021-10-29 | 2024-04-05 | 浙江华电器材检测研究院有限公司 | Transformer winding parameter identification method based on high-frequency excitation |
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