CN108267489A - The judgment method of dry change winding material based on metal material temperature-coefficient of electrical resistance - Google Patents
The judgment method of dry change winding material based on metal material temperature-coefficient of electrical resistance Download PDFInfo
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- CN108267489A CN108267489A CN201711436207.3A CN201711436207A CN108267489A CN 108267489 A CN108267489 A CN 108267489A CN 201711436207 A CN201711436207 A CN 201711436207A CN 108267489 A CN108267489 A CN 108267489A
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- temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
- G01N27/18—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by changes in the thermal conductivity of a surrounding material to be tested
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
Abstract
The invention discloses a kind of judgment method of the dry change winding material based on metal material temperature-coefficient of electrical resistance, including：Within the of short duration time after dry-type transformer is in continuous operation still in the condition of high temperature under, the hot resistance of winding at this time is measured with instrument for measuring DC resistance, the temperature of winding at this time is read with temperature controller；Dry-type transformer is out of service naturally cool to environment temperature after, the cold-state resistance of winding at this time is measured with instrument for measuring DC resistance, the temperature of winding at this time is read with temperature controller；Based on resistance temperature reduction formula, the temperature-coefficient of electrical resistance of dry-type transformer winding material at this time is calculated；The temperature-coefficient of electrical resistance T calculated is compared respectively with the temperature-coefficient of electrical resistance of copper and the temperature-coefficient of electrical resistance of aluminium to judge winding material as copper or aluminium.The present invention judges that dry-type transformer winding material is for aluminium or is copper using the difference of metal material temperature-coefficient of electrical resistance, easy to operate, without destroying apparatus body, also not by place and equipment limit.
Description
Technical field
The present invention relates to a kind of methods for judging dry-type transformer winding material；Metal material is based on specifically related to one kind
Expect the judgment method of the dry-type transformer winding material of temperature-coefficient of electrical resistance.
Background technology
In recent years, due to rapid development of economy, dry-type transformer is widely used in field of power distribution.Though dry-type transformer
Right cost is higher, but compared with oil-immersed transformer, it have it is small, it is easy for installation, safeguard simple, safety net distance is small, peace
Many advantages, such as performance is good entirely, therefore still have broad application prospects.The dry-type transformer especially in distribution transformer
Shared ratio is more and more big, and according to statistics, in the developed countries such as America and Europe, it has accounted for the 40~50% of distribution transformer；
China accounts for 50% or so.
Dry-type transformer insulating resin encapsulated layer generally use is using silica flour as the epoxy resin of filling, new type resin encapsulating
Layer then using the epoxy resin containing 80% glass fibre, is cast in a model, the electric property of slim encapsulated layer and heat dissipation
Performance is also all fine, it is ensured that the safe operation of dry-type transformer.The winding generally use copper foil coiling of dry-type transformer, can drop
Low axial direction short-circuit impact power, layer insulation are H grades of semi-solid preparation insulating materials, coil outer layer glass fiber reinforced resin packet
Envelope has the very strong ability for bearing short circuit.
The safe operation of dry-type transformer and service life are determined by the reliability of winding.Winding temperature
Spend it is exceeded transformer is caused to break down and damage, winding is bad to lead to that load loss is high, the service life declines, these
It is all directly related with winding material.But since dry-type transformer is poured with epoxy resin encapsulating structure, texture of coil cannot be straight
It connects and is detected, therefore part of the manufacturer in order to reduce production cost, employs aluminum winding to pretend to be copper winding, to dry at present
The operation of formula transformer safety brings hidden danger, and can not be to winding coil by the conventional experiment such as experiments such as idling load, no-load voltage ratio
Material differentiated that fractional unit is the winding material detected inside sealing and insulating materials, is detected even with destructiveness.
There are patent (a kind of X ray dry-type transformer winding material detection method, invention patent publication number at this stage：CN 104865278
A it) proposes to judge dry change winding material based on X ray, winding material can be judged in the case where not destroying dry become, but need to adopt
It is higher to site requirement with X-ray detection instrument.
Therefore, the present invention proposes a kind of judgement side of the dry change winding material based on metal material temperature-coefficient of electrical resistance
Method.The size of the resistance of metal material depends on four factors：Length L, cross-sectional area S, the electricalresistivityρ of metal material0(resistance
Resistivity at 0 DEG C), temperature t, i.e.,α is the temperature coefficient of resistance.Due to line expansions of the α than metal
Significantly much (temperature increases 1 DEG C, about 0.001%) metal length only expands, when considering that metallic resistance varies with temperature, length
The variation of degree L and sectional area S can be neglected.And dry-type transformer finishes once manufacturing, and does the length for becoming winding, cross-sectional area, electricity
Resistance rate is all fixed, therefore winding resistance is varied with temperature and changed.
Invention content
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of based on metal material temperature-coefficient of electrical resistance
The dry judgment method for becoming winding material, judges dry-type transformer winding material using the difference of metal material temperature-coefficient of electrical resistance
It is for aluminium or is copper, easy to operate, visual result, without destroying apparatus body, also not by place and equipment limit.
The technical solution adopted by the present invention to solve the technical problems is：
A kind of judgment method of the dry change winding material based on metal material temperature-coefficient of electrical resistance, including：
Step 1, of short duration time after dry-type transformer bringing onto load continuous operation and dry-type transformer temperature is higher than
During environment temperature, the hot resistance R of winding at this time is measured with instrument for measuring DC resistance1, the temperature of winding at this time is read with temperature controller
Spend t1；
Step 2, dry-type transformer is out of service naturally cool to environment temperature after, measured with instrument for measuring DC resistance
The cold-state resistance R of winding at this time2, and read with temperature controller the temperature t of winding at this time2；
Step 3, based on resistance temperature reduction formulaCalculate dry-type transformer winding material at this time
Temperature-coefficient of electrical resistance
Step 4, the temperature-coefficient of electrical resistance T calculated is distinguished with the temperature-coefficient of electrical resistance of copper and the temperature-coefficient of electrical resistance of aluminium
It is compared, if temperature-coefficient of electrical resistance T, closer to the temperature-coefficient of electrical resistance of copper, it is copper to judge winding material；It is if electric
Temperature coefficient T is hindered closer to the temperature-coefficient of electrical resistance of aluminium, then it is aluminium to judge winding material.
Preferably, the of short duration time is being no more than in its 1 times of time constant after dry-type transformer stoppage in transit.
Preferably, in 1.2ks-2ks in its described 1 times of time constant.
Preferably, the dry-type transformer temperature refers specifically to dry-type transformer temperature not less than 47.84 higher than environment temperature
℃。
Preferably, the temperature-coefficient of electrical resistance of the copper is TCopper=235.
Preferably, the temperature-coefficient of electrical resistance T of the aluminiumAluminium=225.
Preferably, it before the step 4, further includes：
Step 1 is repeated to step 3 several times, to the resistance temperature system of several groups of dry-type transformer winding materials calculated
Number is averaged the mean temperature coefficient of resistance T to obtain dry-type transformer winding material.
The present invention has the advantages that：
(1) present invention is without disassembling dry-type transformer winding and the material type inside winding can be sentenced
It is disconnected, it solves and mechanics detection is carried out to winding material after can only being disassembled in actual production, and cannot be in the case of lossless ontology
The difficult point being detected to winding material；
(2) experimental condition this invention simplifies the test of winding material and requirement, not by place and equipment limit during application.
The present invention is described in further detail with reference to the accompanying drawings and embodiments, but one kind of the present invention is based on metal material
Expect that the judgment method of the dry change winding material of temperature-coefficient of electrical resistance is not limited to embodiment.
Description of the drawings
Fig. 1 is the flow chart of the method for the present invention.
Specific embodiment
It is shown in Figure 1, a kind of judgment method of the dry change winding material based on metal material temperature-coefficient of electrical resistance, packet
It includes：
Step 1, of short duration time after dry-type transformer bringing onto load continuous operation and dry-type transformer temperature is higher than
During environment temperature, the hot resistance R of winding at this time is measured with instrument for measuring DC resistance1, the temperature of winding at this time is read with temperature controller
Spend t1；
Specifically, the of short duration time is in the 1.5ks to 2ks after dry-type transformer stoppage in transit, and more early test effect
Better.In addition, it is contemplated that dry-type transformer is H class B insulations, high temperature alarm temperature is usually arranged as 130 DEG C, it is therefore proposed that surveying
Measure R1When dry-type transformer temperature should be not less than 0.368*130 DEG C, i.e., 47.84 DEG C, described 0.368 be dry-type transformer temperature
The temperature to decay after one times of time constant from maximum operating temperature when stopping transport.
Step 2, dry-type transformer is out of service naturally cool to environment temperature after, measured with instrument for measuring DC resistance
The cold-state resistance R of winding at this time2, the temperature t of winding at this time is read with temperature controller2；
Step 3, based on resistance temperature reduction formulaCalculate dry-type transformer winding material at this time
Temperature-coefficient of electrical resistance
Step 4, the temperature-coefficient of electrical resistance T calculated is distinguished with the temperature-coefficient of electrical resistance of copper and the temperature-coefficient of electrical resistance of aluminium
It is compared, if temperature-coefficient of electrical resistance T, closer to the temperature-coefficient of electrical resistance of copper, it is copper to judge winding material；It is if electric
Temperature coefficient T is hindered closer to the temperature-coefficient of electrical resistance of aluminium, then it is aluminium to judge winding material.
Specifically, the temperature-coefficient of electrical resistance of the copper is TCopper=235；The temperature-coefficient of electrical resistance T of the aluminiumAluminium=225.
Further, can also by measuring several groups of data more and being averaged accuracy to ensure result, specifically,
Before the step 4, further include：Step 1 is repeated to step 3 several times, to several groups of dry-type transformer windings calculated
The temperature-coefficient of electrical resistance of material is averaged the mean temperature coefficient of resistance T to obtain dry-type transformer winding material.It again will meter
The mean temperature coefficient of resistance T of calculating is compared respectively with the temperature-coefficient of electrical resistance of copper and the temperature-coefficient of electrical resistance of aluminium, if
For temperature-coefficient of electrical resistance T closer to the temperature-coefficient of electrical resistance of copper, then it is copper to judge winding material；If temperature-coefficient of electrical resistance T is more
Close to the temperature-coefficient of electrical resistance of aluminium, then it is aluminium to judge winding material.
If the temperature-coefficient of electrical resistance that certain temperature-coefficient of electrical resistance T calculated is more than copper is TCopper=235, then judge to lay out
Group material is copper material, illustrates that dry-type transformer coil material is not spoofed；If certain temperature-coefficient of electrical resistance T calculated is small
In aluminium temperature-coefficient of electrical resistance be TAluminium=225, then judge to lay out group material as aluminium material, illustrate dry-type transformer coil material quilt
Pretend to be.If certain temperature-coefficient of electrical resistance T calculated is less than the temperature-coefficient of electrical resistance T of copperCopper=235 and more than aluminium resistance temperature
Degree coefficient is TAluminium=225, then judge whether temperature-coefficient of electrical resistance T is more than 230, if greater than 230, then judge that laying out a group material is
Copper material illustrates that dry-type transformer coil material is not spoofed；If less than 230, then judge to lay out group material as aluminium material, say
Bright dry-type transformer coil material is spoofed；If equal to 230, then it needs to measure and calculate further to sentence again
It is disconnected.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of judgment method of the dry change winding material based on metal material temperature-coefficient of electrical resistance, which is characterized in that including：
Step 1, the of short duration time after dry-type transformer bringing onto load continuous operation and dry-type transformer temperature are higher than environment
During temperature, the hot resistance R of winding at this time is measured with instrument for measuring DC resistance1, the temperature t of winding at this time is read with temperature controller1；
Step 2, dry-type transformer is out of service naturally cool to environment temperature after, measured at this time with instrument for measuring DC resistance
The cold-state resistance R of winding2, and read with temperature controller the temperature t of winding at this time2；
Step 3, based on resistance temperature reduction formulaCalculate the electricity of dry-type transformer winding material at this time
Hinder temperature coefficient
Step 4, the temperature-coefficient of electrical resistance T calculated is carried out respectively with the temperature-coefficient of electrical resistance of copper and the temperature-coefficient of electrical resistance of aluminium
Compare, if temperature-coefficient of electrical resistance T, closer to the temperature-coefficient of electrical resistance of copper, it is copper to judge winding material；If resistance temperature
Coefficient T is spent closer to the temperature-coefficient of electrical resistance of aluminium, then it is aluminium to judge winding material.
2. the judgment method of the dry change winding material according to claim 1 based on metal material temperature-coefficient of electrical resistance,
It is characterized in that, the of short duration time is being no more than in its 1 times of time constant after dry-type transformer stoppage in transit.
3. the judgment method of the dry change winding material according to claim 2 based on metal material temperature-coefficient of electrical resistance,
It is characterized in that, in 1.2ks-2ks in its described 1 times of time constant.
4. the judgment method of the dry change winding material according to claim 1 based on metal material temperature-coefficient of electrical resistance,
It is characterized in that, the dry-type transformer temperature refers specifically to dry-type transformer temperature not less than 47.84 DEG C higher than environment temperature.
5. the judgment method of the dry change winding material according to claim 1 based on metal material temperature-coefficient of electrical resistance,
It is characterized in that, the temperature-coefficient of electrical resistance of the copper is TCopper=235.
6. the judgment method of the dry change winding material according to claim 1 based on metal material temperature-coefficient of electrical resistance,
It is characterized in that, the temperature-coefficient of electrical resistance T of the aluminiumAluminium=225.
7. the judgment method of the dry change winding material according to claim 1 based on metal material temperature-coefficient of electrical resistance,
It is characterized in that, before the step 4, further includes：
Step 1 is repeated to step 3 several times, the temperature-coefficient of electrical resistance of several groups of dry-type transformer winding materials calculated is taken
Average value is to obtain the mean temperature coefficient of resistance T of dry-type transformer winding material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711436207.3A CN108267489B (en) | 2017-12-26 | 2017-12-26 | Method for judging material quality of dry-variable winding based on resistance temperature coefficient of metal material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711436207.3A CN108267489B (en) | 2017-12-26 | 2017-12-26 | Method for judging material quality of dry-variable winding based on resistance temperature coefficient of metal material |
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| CN108267489B CN108267489B (en) | 2020-09-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113009234A (en) * | 2021-02-23 | 2021-06-22 | 方圆广电检验检测股份有限公司 | Automatic winding resistance measuring system and measuring method thereof |
| CN113268035A (en) * | 2021-05-14 | 2021-08-17 | 格力电器（武汉）有限公司 | Idle call pottery PTC electric heating pipe life-span experiment monitored control system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN107192738A (en) * | 2017-07-19 | 2017-09-22 | 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 winding material |
-
2017
- 2017-12-26 CN CN201711436207.3A patent/CN108267489B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN107192738A (en) * | 2017-07-19 | 2017-09-22 | 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 winding material |
Non-Patent Citations (2)
| Title |
|---|
| 刘增良等编: "《新编大学物理实验》", 31 July 2016, 北京：北京邮电大学出版社 * |
| 才家刚: "《三相异步电动机试验检测技术手册》", 31 October 2014, 上海：上海科学技术出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113009234A (en) * | 2021-02-23 | 2021-06-22 | 方圆广电检验检测股份有限公司 | Automatic winding resistance measuring system and measuring method thereof |
| CN113268035A (en) * | 2021-05-14 | 2021-08-17 | 格力电器（武汉）有限公司 | Idle call pottery PTC electric heating pipe life-span experiment monitored control system |
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