CN108593722A - Transformer insulated cardboard based on effect of electromagnetic field makes moist quantitative evaluating method - Google Patents
Transformer insulated cardboard based on effect of electromagnetic field makes moist quantitative evaluating method Download PDFInfo
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- CN108593722A CN108593722A CN201810298305.3A CN201810298305A CN108593722A CN 108593722 A CN108593722 A CN 108593722A CN 201810298305 A CN201810298305 A CN 201810298305A CN 108593722 A CN108593722 A CN 108593722A
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- G—PHYSICS
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- 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
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
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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
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
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Abstract
The present invention relates to a kind of transformer insulated cardboard based on effect of electromagnetic field makes moist quantitative evaluating method, technical characteristics are：Oil is taken to tested transformer, oil sample test product is sent to laboratory test；Carry out the transformer dielectric spectrometry at scene；Calculate the dielectric constant of transformer under specific frequency；Dielectric spectrometry is carried out to insulating paper test product；Establish XY models；Calculate the overall dielectric spectrum of transformer under different moisture content；It is fitted the relationship of transformer dielectric constant and insulating board water content under specific frequency；Calculating transformer insulating board water content.Reasonable design of the present invention, it is measured and convenience of calculation, as a result accurately, realizes the transformer insulated cardboard not hung under cover sampling condition and makes moist situation qualitative assessment function, contribute to the personnel such as O＆M, experiment, maintenance to accurately hold running state of transformer, realizes precisely analysis and equipment Management Function.
Description
Technical field
The invention belongs to transformer test technical field, especially a kind of transformer insulating paper based on effect of electromagnetic field
Plate makes moist quantitative evaluating method.
Background technology
Oil-Paper Insulation is the primary insulation structure of oil-immersed transformer.In Oil-Paper Insulation, moisture is both oil
The primary product of Aging of Oil-paper Insulation in Oil embodies the water content of paper oil insulation, while promoting again as the participant of ageing process
Oil, paper cellulose hydrolysis, generate irreversible acceleration to insulating materials aging, can be rated as and threaten transformer oil in addition to temperature
Paper insulated " number one killer ".It is found by numerous studies, moisture increase can seriously affect the mechanical life of insulating paper, together
When insulating paper heat ageing speed dramatically increase.The breakdown voltage of Oil-Paper Insulation can subtract with the increase of water content in oil content
It is small, when moisture is more than to allow maximum value, results even in apparatus insulated performance failure and bring serious accident.Moisture
Or the catalyst of the high molecular materials chemical degradations such as oil, paper cellulose reaction generates irreversible add to material degradation aging
Speed effect.Therefore, how convenient, accurately to transformer insulated cardboard aging conditions carry out qualitative assessment be at present there is an urgent need to
It solves the problems, such as.
Invention content
It is an object of the invention to overcome the deficiencies in the prior art, a kind of reasonable design, accurate and reliable and convenient fast is proposed
The prompt transformer insulated cardboard based on effect of electromagnetic field makes moist quantitative evaluating method.
The present invention solves its technical problem and following technical scheme is taken to realize：
A kind of transformer insulated cardboard based on effect of electromagnetic field makes moist quantitative evaluating method, includes the following steps：
Step 1, on-the-spot test step：Oil is taken to tested transformer, oil sample test product is sent to laboratory test；Carry out scene
Transformer dielectric spectrometry；Calculate the dielectric constant of transformer under specific frequency；
Step 2, laboratory test step：The oil sample test product that on-the-spot test is provided；Prepare the insulating paper of different moisture content
Test product；Dielectric spectrometry is carried out to insulating paper test product；
Step 3, simulation calculation step：Obtain the transformer insulated cardboard number of plies, thickness, oil duct distance, cushion block and stay number
It measures and establishes XY models；Calculate the overall dielectric spectrum of transformer under different moisture content；It is normal to be fitted transformer dielectric under specific frequency
The relationship of number and insulating board water content；Transformation under transformer dielectric constant and specific frequency under the frequency is measured according to scene
The relationship of device dielectric constant and insulating board water content, calculating transformer insulating board water content.
The method of the transformer dielectric spectrometry is：Using frequency domain dielectric response technology, by measuring different frequency electricity
The voltage between transformer high-low-voltage side and the electric current for flowing through transformer, the frequency response for drawing complex dielectric permittivity real part are special off field
Linearity curve.
The method of transformer dielectric constant is under the calculating specific frequency：
Apply the alternating voltage U=U that angular frequency is the π of ω=2 f between transformer high-low-voltage side0eiωtWhen, consider transformation
The capacitance C and conductance G of device Oil-Paper Insulation, the electric current I for flowing through transformer are：
C*(ω)=C'(ω)-jC " (ω)
In above formula, j indicates imaginary part, C*Hold for the equivalent telegram in reply of Oil-Paper Insulation, C' and C " are respectively C*Real part and
Imaginary part.
The frequency response characteristic of above-mentioned complex dielectric permittivity real part is ε ' (ω).
The method of the insulating paper test product for preparing different moisture content is：Insulating board is cut into several same sizes
Sample is placed on drying in air dry oven, is placed in air the different time that makes moist naturally, forms the insulating paper of different moisture content
Test product, and measure by Karl-Fischer moisture testers the water content of different test products.
The XY models include paper web, oil duct and stay, wherein X values are main exhausted between paper web overall thickness and high-low pressure winding
The ratio between edge thickness, Y value the ratio between major insulation average perimeter between stay overall width and high-low pressure winding.
The theoretical dielectric spectra of the XY models is calculated by following formula：
Wherein j indicates that imaginary part, ω are angular frequency, and T is Oil-Paper Insulation temperature；ε*tot(ω) is paper oil insulation system
The complex dielectric permittivity frequency domain spectra for uniting total；ε*oil(ω) is the complex dielectric permittivity frequency domain spectra of insulating oil；ε*PB(ω) is insulating board
Complex dielectric permittivity frequency domain spectra；σ (T) is DC conductivity of the insulating oil at temperature T；ε0For permittivity of vacuum, and ε0=
8.85e-12F/m。
Transformer dielectric constant and the method for the relationship of insulating board water content are under the fitting specific frequency：It selects low
The dielectric constant values of frequency position build the functional relation of transformer dielectric constant and insulating board water content.
The advantages and positive effects of the present invention are：
Reasonable design of the present invention is led under conditions of obtaining the relevant parameters such as transformer device structure size and insulation oil sample
It crosses in-site measurement transformer dielectric spectra and quickly calculates insulating board water content, measure and as a result accurately convenience of calculation realizes
The transformer insulated cardboard under cover sampling condition is not hung to make moist situation qualitative assessment function, contributes to O＆M, experiment, maintenance et al.
Member accurately holds running state of transformer, realizes precisely analysis and equipment Management Function.
Description of the drawings
Fig. 1 is process chart of the present invention；
Fig. 2 is dielectric spectroscopy test schematic；
Fig. 3 is transformer oil paper insulation structure chart；
Fig. 4 is the simplified model of transformer oil paper insulation structure；
Fig. 5 is the dielectric constant that the present embodiment obtains and the curve of frequency；
Fig. 6 is the dielectric constant that the present embodiment obtains and the curve of moisture.
Specific implementation mode
The embodiment of the present invention is further described below in conjunction with attached drawing.
A kind of transformer insulated cardboard based on effect of electromagnetic field makes moist quantitative evaluating method, as shown in Figure 1, by scene
Test, simulation calculation and laboratory test three parts composition, the step in corresponding diagram 1 in A row, B row and C row respectively, below it is right
Three parts illustrate respectively：
Step 1, on-the-spot test step, including following procedure：
(1) oil is taken to tested transformer, oil sample test product is sent to laboratory test.
(2) the transformer dielectric spectrometry at scene is carried out.The dielectric spectrometry of transformer uses frequency domain dielectric response technology,
By measuring the voltage under different frequency electric field between transformer high-low-voltage side and flowing through the electric current of transformer, it is normal to draw multiple dielectric
The frequency response characteristic of number real part.Dielectric spectroscopy test philosophy is as shown in Figure 2.
(3) dielectric constant of transformer under specific frequency is calculated.
Apply the alternating voltage U=U that angular frequency is the π of ω=2 f between transformer high-low-voltage side0eiωtWhen, consider transformation
The capacitance C and conductance G of device Oil-Paper Insulation, the electric current I for flowing through transformer are：
C*(ω)=C'(ω)-jC " (ω)
In above formula, j indicates imaginary part, C*Hold for the equivalent telegram in reply of Oil-Paper Insulation, C' and C " are respectively C*Real part and
Imaginary part.
Capacitance is related with dielectric dielectric constant and shape.Such as by taking parallel-plate type electrode as an example
C*(ω)=ε0S[ε'(ω)-jε”(ω)]/d
Wherein S is polar plate area, and d is dielectric thickness, and ε ' and ε " are respectively the real and imaginary parts of complex dielectric permittivity, ε0For
Permittivity of vacuum, and ε0=8.85e-12F/m。
The frequency response characteristic of above-mentioned complex dielectric permittivity real part is ε ' (ω).
Step 2, laboratory test step, including following procedure：
(1) the oil sample test product that on-the-spot test is provided, the DC conductivity of measuring transformer insulation oil sample.
(2) the insulating paper test product of different moisture content is prepared, specific method is：The preparation of the insulating paper test product of different moisture content
Method is：Insulating board is cut into the sample of several same sizes, is placed on drying in air dry oven, is placed in air certainly
So make moist different time, forms the insulating paper test product of different moisture content, and measure not by Karl-Fischer moisture testers
With the water content of test product.
(3) dielectric spectrometry is carried out to the insulating paper test product of preparation.
Step 3, simulation calculation step, including following procedure：
(1) dependency structures and the electricity such as the transformer insulated cardboard number of plies, thickness, oil duct distance, cushion block and stay quantity are obtained
Gas parameter establishes XY models.
XY models are to simplify transformer oil paper insulation structure (as shown in Figure 3), i.e., by all paper webs, oil duct and support
Item integrates respectively, obtains the simplified model of transformer major-insulation structure as shown in Figure 4.Wherein, X values are paper web overall thickness and height
The ratio between major insulation thickness between low pressure winding, Y value the ratio between major insulation average perimeter between stay overall width and high-low pressure winding.
(2) the overall dielectric spectrum of transformer under different moisture content is calculated.The theoretical dielectric spectra of XY models can be calculated by following formula：
Wherein j indicates that imaginary part, ω are angular frequency, and T is Oil-Paper Insulation temperature；ε*tot(ω) is paper oil insulation system
The complex dielectric permittivity frequency domain spectra for uniting total, i.e. transformer dielectric spectra；ε*oil(ω) is the complex dielectric permittivity frequency domain spectra of insulating oil；ε*PB
(ω) is the complex dielectric permittivity frequency domain spectra of insulating board, is obtained by above-mentioned laboratory test part；σ (T) is insulating oil in temperature
The DC conductivity under T is spent, laboratory test part is again may be by and obtains；ε0For permittivity of vacuum, and ε0=8.85e-12F/m。
(3) it is fitted the relation function of transformer dielectric constant and insulating board water content under specific frequency.
ε*oilThe real part of (ω), that is, transformer dielectric constant and insulating board water content are in close relations, especially in low frequency
Section.Typical dielectric constant curve is as shown in Figure 5.The dielectric constant values of certain low frequency position (such as 0.001Hz) are selected, transformation is built
The functional relation of device dielectric constant and insulating board water content.
(4) according to scene measure under the frequency under the dielectric constant of transformer and specific frequency transformer dielectric constant with absolutely
The relation function of edge cardboard water content, you can calculate insulating board water content.
It in the present embodiment, can (thickness be insulating board when prepared by the insulating board for preparing different moisture content
It 1mm) is cut into the square plate that the length of side is 60mm, is put into dry 48h in the air dry oven that temperature is 105 DEG C；Then wet
Degree for 60% room in open wide stand 0h, 1h, 3h, 8h, for 24 hours, 48h, so that cardboard is made moist naturally, pass through Karl-Fischer water
It is respectively 0.54%, 1.08%, 1.95%, 3.26%, 4.42%, 5.72% to divide tester to measure cardboard water content.To above-mentioned
The curve of test product measurement effect of electromagnetic field, dielectric constant and frequency is Fig. 5.
Choose the point under 0.001Hz in the low-frequency range of Fig. 5, obtain the curve of dielectric constant and moisture as shown in fig. 6,
The correspondence that it is fitted with moisture is shown below, i.e., the approximately linear relationship of the two, goodness of this fitting are
0.954, show that the correlation of obtained expression formula is stronger.
ε=2.762w-0.488.
It is emphasized that embodiment of the present invention is illustrative, without being restrictive, therefore packet of the present invention
Include the embodiment being not limited to described in specific implementation mode, it is every by those skilled in the art according to the technique and scheme of the present invention
The other embodiment obtained, also belongs to the scope of protection of the invention.
Claims (7)
- The quantitative evaluating method 1. a kind of transformer insulated cardboard based on effect of electromagnetic field makes moist, it is characterised in that including following Step：Step 1, on-the-spot test step：Oil is taken to tested transformer, oil sample test product is sent to laboratory test；Carry out the change at scene Depressor dielectric spectrometry；Calculate the dielectric constant of transformer under specific frequency；Step 2, laboratory test step：The oil sample test product that on-the-spot test is provided；Prepare the insulating paper test product of different moisture content； Dielectric spectrometry is carried out to insulating paper test product；Step 3, simulation calculation step：Obtain the transformer insulated cardboard number of plies, thickness, oil duct distance, cushion block and stay quantity simultaneously Establish XY models；Calculate the overall dielectric spectrum of transformer under different moisture content；Be fitted specific frequency under transformer dielectric constant with The relationship of insulating board water content；Transformer under transformer dielectric constant and specific frequency under the frequency is measured according to scene to be situated between The relationship of electric constant and insulating board water content, calculating transformer insulating board water content.
- The quantitative evaluating method 2. the transformer insulated cardboard according to claim 1 based on effect of electromagnetic field makes moist, It is characterized in that：The method of the transformer dielectric spectrometry is：Using frequency domain dielectric response technology, by measuring different frequency electricity The voltage between transformer high-low-voltage side and the electric current for flowing through transformer, the frequency response for drawing complex dielectric permittivity real part are special off field Linearity curve.
- The quantitative evaluating method 3. the transformer insulated cardboard according to claim 1 based on effect of electromagnetic field makes moist, It is characterized in that：The method of transformer dielectric constant is under the calculating specific frequency：Apply the alternating voltage U=U that angular frequency is the π of ω=2 f between transformer high-low-voltage side0eiωtWhen, consider transformer oil The capacitance C and conductance G of paper insulation system, the electric current I for flowing through transformer are：C*(ω)=C'(ω)-jC " (ω)In above formula, j indicates imaginary part, C*Hold for the equivalent telegram in reply of Oil-Paper Insulation, C' and C " are respectively C*Real part and void Portion.The frequency response characteristic of above-mentioned complex dielectric permittivity real part is ε ' (ω).
- The quantitative evaluating method 4. the transformer insulated cardboard according to claim 1 based on effect of electromagnetic field makes moist, It is characterized in that：The method of the insulating paper test product for preparing different moisture content is：Insulating board is cut into several same sizes Sample, be placed in air dry oven dry, be placed in air the different time that makes moist naturally, form the insulation of different moisture content Paper test product, and measure by Karl-Fischer moisture testers the water content of different test products.
- The quantitative evaluating method 5. the transformer insulated cardboard according to claim 1 based on effect of electromagnetic field makes moist, It is characterized in that：The XY models include paper web, oil duct and stay, wherein X values are main exhausted between paper web overall thickness and high-low pressure winding The ratio between edge thickness, Y value the ratio between major insulation average perimeter between stay overall width and high-low pressure winding.
- The quantitative evaluating method 6. the transformer insulated cardboard according to claim 1 based on effect of electromagnetic field makes moist, It is characterized in that：The theoretical dielectric spectra of the XY models is calculated by following formula：Wherein j indicates that imaginary part, ω are angular frequency, and T is Oil-Paper Insulation temperature；ε*tot(ω) is that Oil-Paper Insulation is total Complex dielectric permittivity frequency domain spectra；ε*oil(ω) is the complex dielectric permittivity frequency domain spectra of insulating oil；ε*PB(ω) is multiple Jie of insulating board Electric constant frequency domain spectra；σ (T) is DC conductivity of the insulating oil at temperature T；ε0For permittivity of vacuum, and ε0=8.85e- 12F/m。
- The quantitative evaluating method 7. the transformer insulated cardboard according to claim 1 based on effect of electromagnetic field makes moist, It is characterized in that：Transformer dielectric constant and the method for the relationship of insulating board water content are under the fitting specific frequency：Selection The dielectric constant values of low frequency position build the functional relation of transformer dielectric constant and insulating board water content.
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| CN109917254A (en) * | 2019-04-27 | 2019-06-21 | 西南交通大学 | A kind of dielectric spectroscopy modeling method of oil-immersed sleeve pipe interior insulation dampness |
| CN110705003A (en) * | 2019-08-14 | 2020-01-17 | 广西博电科技有限公司 | Method for establishing frequency domain dielectric response characteristic fingerprint database based on depth fitting |
| CN110849943A (en) * | 2019-11-26 | 2020-02-28 | 重庆大学 | Non-contact type insulation medium response full-automatic test method and electrode box for test |
| CN111650254A (en) * | 2020-05-22 | 2020-09-11 | 北京海智元科技有限公司 | Fuel water on-line monitoring device |
| CN112666231A (en) * | 2020-11-17 | 2021-04-16 | 国网上海市电力公司 | Method for testing water content of solid insulation of converter transformer |
| CN112710705A (en) * | 2020-11-30 | 2021-04-27 | 广西大学 | Method for evaluating oil-immersed insulation damp state of sleeve based on frequency domain dielectric modulus |
| CN112782537A (en) * | 2020-12-23 | 2021-05-11 | 南方电网电力科技股份有限公司 | Transformer bushing damp state evaluation method based on high-voltage frequency domain dielectric spectrum |
| CN113670986A (en) * | 2021-07-13 | 2021-11-19 | 深圳供电局有限公司 | Moisture evaluation method, device and equipment of transformer and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109917254A (en) * | 2019-04-27 | 2019-06-21 | 西南交通大学 | A kind of dielectric spectroscopy modeling method of oil-immersed sleeve pipe interior insulation dampness |
| CN110705003A (en) * | 2019-08-14 | 2020-01-17 | 广西博电科技有限公司 | Method for establishing frequency domain dielectric response characteristic fingerprint database based on depth fitting |
| CN110849943A (en) * | 2019-11-26 | 2020-02-28 | 重庆大学 | Non-contact type insulation medium response full-automatic test method and electrode box for test |
| CN110849943B (en) * | 2019-11-26 | 2022-04-22 | 重庆大学 | Non-contact type insulation medium response full-automatic test method and electrode box for test |
| CN111650254A (en) * | 2020-05-22 | 2020-09-11 | 北京海智元科技有限公司 | Fuel water on-line monitoring device |
| CN112666231A (en) * | 2020-11-17 | 2021-04-16 | 国网上海市电力公司 | Method for testing water content of solid insulation of converter transformer |
| CN112666231B (en) * | 2020-11-17 | 2022-11-29 | 国网上海市电力公司 | Method for testing water content of solid insulation of converter transformer |
| CN112710705A (en) * | 2020-11-30 | 2021-04-27 | 广西大学 | Method for evaluating oil-immersed insulation damp state of sleeve based on frequency domain dielectric modulus |
| CN112710705B (en) * | 2020-11-30 | 2023-06-27 | 广西大学 | Method for evaluating oil-immersed insulation damp state of sleeve based on frequency domain dielectric modulus |
| CN112782537A (en) * | 2020-12-23 | 2021-05-11 | 南方电网电力科技股份有限公司 | Transformer bushing damp state evaluation method based on high-voltage frequency domain dielectric spectrum |
| CN113670986A (en) * | 2021-07-13 | 2021-11-19 | 深圳供电局有限公司 | Moisture evaluation method, device and equipment of transformer and storage medium |
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