CN104597202B - Method for measuring moisture content of insulating paper by using moisture content of insulating oil - Google Patents
Method for measuring moisture content of insulating paper by using moisture content of insulating oil Download PDFInfo
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- CN104597202B CN104597202B CN201510079934.3A CN201510079934A CN104597202B CN 104597202 B CN104597202 B CN 104597202B CN 201510079934 A CN201510079934 A CN 201510079934A CN 104597202 B CN104597202 B CN 104597202B
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Abstract
The invention relates to a method for measuring moisture content of insulating paper by using moisture content of insulating oil. The method comprises the following steps in sequence: (a) taking the insulating oil from an oil-immersed power transformer during work and measuring the temperature T of the insulating oil in a real-time manner; (b) taking some insulating oil with the temperature being measured, putting the insulating oil in a Karl Fischer titrimeter, and measuring the moisture content of the insulating oil, Woil; (c) using a formula (1) to calculate the mass percentage of the moisture in the insulating paper, Wpaper. (The formula (1) is shown in the description.) According to the method provided by the invention, the moisture content of the insulating paper can be calculated only through measuring the temperature and the moisture content of the insulating oil and using the formula (1); the method not only reduces the steps greatly, but also is simple to operate, costs less time, and is precise in measurement.
Description
Technical field
The invention belongs to electricity device field, it is related to a kind of assay method of moisture and in particular to a kind of application is exhausted
The method of moisture in edge water content in oil content measurement insulating paper.
Background technology
Oil-immersed power transformer is one of key equipment of power system.Research shows, the transformer event of the overwhelming majority
Barrier is caused by interior insulation problem.Oil-paper combination insulation, as the major insulation system of inside transformer, is chronically at high temperature, tide
Under the adverse circumstances such as wet, chemical attack and electromagnetic field, its insulating properties can significantly reduce, thus leading to the mechanical life of transformer
With electrical endurance serious curtailment.Insulating oil in oil-paper combination insulation the measure such as can pass through oil strain, change oil and recovering its insulating properties,
And insulating paper be difficult change and aging be irreversible, therefore the degree of aging of insulating paper directly determines the use of transformer
Life-span.Hydrolytic degradation is the aging principal mode of insulating paper, and in insulating paper, moisture doubles, and its mechanical life halves,
Heat ageing speed also will accelerate at double；In insulating paper, moisture is many and is affected and inconspicuous by oil strain, the measure such as change oil, its
Testing index as insulating paper ageing state has higher reliability.
The internationally recognized at present parameter judging that insulating paper reaches end of life is insulation paper polymerization degree.Insulation paper polymerization degree
It is the degree of aging that can truly reflect insulating paper.DL/T 596-2005《Power equipment preventive trial code》Recommend polymerization
When degree is less than 250, should arouse attention.But the test of the degree of polymerization need to carry out draining the oil to transformer and hang cover, not only enforcement difficulty is big,
May also result in the damage of insulation.For the oil-filled transformer having put into operation, due to being difficult to directly obtain insulating paper sample,
In test insulating paper during water content, typically first adopt Karl_Fischer method, i.e. KFT（Karl Fischer Titration）Method is tested
Moisture in insulating oil, obtains the moisture in insulating paper further according to the Oil-Paper Insulation moisture distribution profile of equilibrium；
The paper oil insulation moisture distribution profile of equilibrium using at present is mainly Oommen curve.Need moisture using Oommen curve exhausted
Edge oil and insulating paper reach poised state, and time-consuming, and trivial operations, therefore using the method test not simplicity with accurately.
Content of the invention
The invention aims to overcoming the deficiencies in the prior art and providing moisture measurement in a kind of application insulating oil
The method of moisture in insulating paper.
For reaching above-mentioned purpose, the technical solution adopted in the present invention is：Moisture measurement in a kind of application insulating oil
The method of moisture in insulating paper, it comprises the following steps successively：
（a）Take the insulating oil of oil-immersed power transformer in work, temperature T of the real time measure insulating oil；
（b）The insulating oil that part measures excess temperature is taken to be placed in karl Fischer titrator, the content of measurement wherein moisture
Woil；
（c）Using formula（1）The weight/mass percentage composition W of moisture in insulating paper can be calculatedpaper,
（1）.
Optimally, described temperature T is 10 DEG C ~ 100 DEG C.
Because technique scheme is used, the present invention compared with prior art has following advantages：In insulating paper of the present invention
The assay method of moisture, it, only by the temperature measuring insulating oil and moisture, then utilizes formula（1）Can calculate
Obtain moisture in insulating paper, not only step is greatly decreased, and simple to operate, taken time seldom, measurement is accurately.
Figure of description
Fig. 1 is experimental facilities layout drawing of the present invention；
Wherein, 1 is glassware, and 2 is aqueous glycerol solution, and 3 is perforated baffle, and 4 is open glass bottle, and 5 is insulating paper,
6 is insulating oil, and 7 is insulating box, and 8 is Temperature Humidity Sensor, and 9 is humiture recorder.
Specific embodiment
The method that in present invention application insulating oil, moisture measures moisture in insulating paper, it includes following step successively
Suddenly：（a）Take the insulating oil of oil-immersed power transformer in work, temperature T of the real time measure insulating oil；（b）Part is taken to measure
The insulating oil of temperature is placed in karl Fischer titrator, content W of measurement wherein moistureoil；（c）Using formula（1）Can calculate
The weight/mass percentage composition W of moisture in insulating paperpaper,
（1）.
It should be noted that preferably 10 DEG C ~ 100 DEG C of temperature T to be determined, the data so measuring is more accurate.
The principle that said determination method is related to is as follows：
In insulating oil, water saturation solubility and the relation of insulation oil temperature meet Arrhenius equation, can be expressed as：
（2）；
In formula, WsIt is water saturation solubility in insulating oil, unit is ppm；T is the temperature of insulating oil, unit be DEG C；A
It is incidence coefficient with B, relevant with the constituent of insulating oil, chemical property etc..
According to the uncommon adsorption isotherm of Freund profit（Freundlich Isotherm Equation）, paper oil insulation system
Moisture in insulating paper for the middle absorption can be expressed as：
（3）；
In formula, WpaperIt is the content of moisture in insulating paper, with weight/mass percentage composition or mass percent（%）Represent；C is to inhale
The attached equilibrium constant, typically reduces with the rising of temperature；N is to characterize the strong and weak parameter of material absorption property；P is adsorbed component
（Water vapour）Equilibrium partial pressure in the gas phase, unit is kPa.
Again due to the relative humidity of in the air（RHair）Refer at identical temperature, water vapor in air pressure（P）And saturation water
Vapour pressure（Ps）Percentage, as shown in Equation 4：
（4）；
Relative humidity in insulating oil（RHoil）Refer at identical temperature, moisture in insulating oil（Woil）Satisfy with moisture
And solubility（Ws）Percentage, as formula（5）Shown：
（5）；
In same environmental system, the relative humidity in different states of matters is equal, therefore the relative humidity of in the air
（RHair）With the relative humidity in insulating oil（RHoil）Equal, i.e. RHair= RHoil, then formula（4）With（5）Simultaneous obtains formula
（6）：
（6）.
Wherein, the saturated vapor pressure numerical tabular under different temperatures as shown in table 1, can be obtained using the data in this table in matching
Saturated vapor pressure formula under different temperatures, as formula（7）Shown：
（7）.
Saturated vapor pressure numerical tabular under table 1 different temperatures
| Temperature（℃） | 10 | 15 | 20 | 25 | 30 | 35 | 40 |
| Saturated water vapor pressure（kPa） | 1.2262 | 1.7068 | 2.3346 | 3.1684 | 4.2474 | 5.6207 | 7.3766 |
| Temperature（℃） | 45 | 50 | 55 | 60 | 65 | 70 | 75 |
| Saturated water vapor pressure（kPa） | 9.5837 | 12.340 | 15.743 | 19.923 | 25.014 | 31.164 | 38.554 |
| Temperature（℃） | 80 | 85 | 90 | 95 | 100 | ||
| Saturated water vapor pressure（kPa） | 47.379 | 57.875 | 70.136 | 84.556 | 101.33 |
In order to obtain parameter A, B, c and n, the present invention is tested using testing equipment as shown in Figure 1, specially：
（1）The insulating oil 6 that will be dried（In insulating oil, moisture is less than 10ppm）With insulating paper 5（In insulating paper, moisture contains
Amount is less than 0.4%）It is 18 according to mass ratio:1 ratio mixing is placed in open glass bottle 4, is then placed in open glass bottle 4
72h is stood, the temperature of regulating thermostatic case 7 is 40 DEG C simultaneously in insulating box 7；
（2）Aqueous glycerol solution 2 is placed in glassware 1, perforated baffle 3 is placed in the top of glassware 1, then will
Glassware 1 is placed in the top that open glass bottle 4 is placed in insulating box 7 perforated baffle 3 together with perforated baffle 3；
（3）By humiture recorder 9 real-time monitoring outside the Temperature Humidity Sensor 8 that is placed in insulating box 7 and insulating box 7
Temperature in insulating box 7 and relative humidity：Temperature first in regulating thermostatic case 7 is 10 DEG C, according to ASTM D5032-2011 behaviour
Make the relative humidity in code regulating thermostatic case 7, after moisture after insulating oil 6 and insulating paper 5 reach poised state, using moisture
Content meter（915 KF Ti-Touch body formula karl Fischer titrators）Sporadically measure in insulating oil 6 and insulating paper 5
Moisture；Then the temperature in regulating thermostatic case 7 is 20 DEG C ~ 100 DEG C successively（10 DEG C of interval）, treat moisture in insulating oil 6 He
After insulating paper 5 reaches poised state, sporadically measure the moisture in insulating oil 6 and insulating paper 5；
（4）Insulating oil 6 and insulating paper 5 are dried after process, in insulating oil 6, moisture is less than 10ppm, insulating paper
In 5, moisture is less than 0.4%；Temperature in regulating thermostatic case 7 is 10 DEG C, and relative humidity is 60%；When warm and humid outside insulating box 7
Degree recorder 9 display relative humidity is during a constant numerical value it is believed that the moisture in insulating oil 6 reaches saturation, adopts
KFT method measures the moisture in insulating oil 6, and this value is water saturation solubility in insulating oil；Then according to the method is divided
The temperature in insulating box 7 Ce Shi be not 15 DEG C ~ 100 DEG C（5 DEG C of interval）When insulating oil in water saturation solubility.
By above test method, water saturation solubility in the insulating oil under different temperatures can be obtained, as table 2 institute
Show.
Water saturation solubility in insulating oil under table 2 different temperatures
| Temperature（℃） | 10 | 15 | 20 | 25 | 30 | 35 | 40 |
| Water content in oil saturation solubility（ppm） | 33.03 | 41.82 | 52.53 | 65.46 | 81.02 | 99.52 | 121.49 |
| Temperature（℃） | 45 | 50 | 55 | 60 | 65 | 70 | 75 |
| Water content in oil saturation solubility（ppm） | 147.38 | 177.71 | 213.08 | 254.09 | 301.43 | 355.79 | 417.98 |
| Temperature（℃） | 80 | 85 | 90 | 95 | 100 | ||
| Water content in oil saturation solubility（ppm） | 488.82 | 569.11 | 659.86 | 762.14 | 876.53 |
Using least square method to the data in table 2 according to formula（2）It is fitted, parameter A and parameter B can be obtained,
Wherein, A=7.332, B=1638.3, i.e. formula（2）For.
Simultaneously by above test method, can obtain under condition of different temperatures, the moisture in insulating paper and insulating oil contains
Amount, as shown in table 3.
Moisture in insulating paper and insulating oil under table 3 different temperatures
By formula（6）, formula（7）And formula（2）Substitute into formula（3）In, can get formula（8）：
（8）；
Using least square method to the data in table 3 according to formula（8）It is fitted, parameter c and parameter n can be obtained,
Respectively as shown in table 4 and table 5.
The value of parameter c under table 4 different temperaturesc
| Temperature（℃） | 10 | 20 | 30 | 40 | 50 | 60 | 70 |
| c | 10.573 | 7.862 | 5.069 | 2.784 | 1.593 | 1.182 | 0.826 |
| Temperature（℃） | 80 | 90 | 100 | ||||
| c | 0.548 | 0.357 | 0.232 |
The value of parameter n under table 5 different temperaturesn
| Temperature（℃） | 10 | 20 | 30 | 40 | 50 | 60 | 70 |
| n | 0.4028 | 0.4672 | 0.5228 | 0.5753 | 0.6328 | 0.7002 | 0.7529 |
| Temperature（℃） | 80 | 90 | 100 | ||||
| n | 0.8109 | 0.8685 | 0.9273 |
The relation of parameter c and temperature T matching can be obtained according to the data in table 4, as formula（9）Shown：
（9）；
The relation of parameter n and temperature T matching can be obtained according to the data in table 5, as formula（10）Shown：
（10）,
So by formula（9）And formula（10）Substitute into formula（8）In, obtain the oil temperature that insulate（T, unit is：℃）And insulating oil
Middle moisture（Woil, unit is：ppm）In the case of oil-filled transformer insulating paper in moisture computing formula, as formula
（1）：
（1）.
The preferred embodiment of the invention will be described in detail below.
Embodiment 1
Take the insulating oil of certain oil-filled transformer, record its temperature T and be 68 DEG C；Then 1 ~ 10 milliliter of insulating oil is taken to be placed in
Moisture W in test insulating oil in 915 KF Ti-Touch body formula karl Fischer titratorsoilFor 43.7ppm；T=68
℃、Woil=43.7ppm substitutes in following formula, tries to achieve moisture in insulating paper：
（%）
I.e.：
（%）
Therefore being tested the moisture obtaining in this oil-filled transformer insulating paper is 2.469%.
Embodiment 2
Temperature T testing certain oil-filled transformer insulating oil is 80 DEG C；Then, using 915 KF Ti-Touch body formula cards
Moisture W in insulating oil tested by Er Feixiu titratoroilFor 28.5ppm；T=80 DEG C, Woil=28.5ppm substitutes into following calculation
In formula, try to achieve moisture in insulating paper：
（%）
I.e.
（%）
Therefore being tested the moisture obtaining in this oil-filled transformer insulating paper is 1.276%.
Above-described embodiment only technology design to illustrate the invention and feature, its object is to allow person skilled in the art
Scholar will appreciate that present disclosure and implements according to this, can not be limited the scope of the invention with this.All according to the present invention
Equivalence changes or modification that Spirit Essence is made, all should be included within the scope of the present invention.
Claims (2)
1. in a kind of application insulating oil, moisture measures the method for moisture in insulating paper it is characterised in that it wraps successively
Include following steps：
（a）Take the insulating oil of oil-immersed power transformer in work, temperature T of the real time measure insulating oil；
（b）The insulating oil that part measures excess temperature is taken to be placed in karl Fischer titrator, content W of measurement wherein moistureoil；
（c）The relational expression of water saturation solubility and insulation oil temperature in insulating oil（1）：
（1）；
In formula, WsIt is water saturation solubility in insulating oil, unit is ppm；T is the temperature of insulating oil, unit be DEG C；A and B be
Incidence coefficient, relevant with the constituent of insulating oil, chemical property；
Adsorb the moisture in insulating paper in paper oil insulation system and can meet formula（2）：
（2）；
In formula, WpaperIt is the content of moisture in insulating paper, represented with weight/mass percentage composition；C is adsorption equilibrium costant, typically with temperature
Degree rising and reduce；N is to characterize the strong and weak parameter of material absorption property；P is water vapour equilibrium partial pressure in the gas phase, unit
For kPa；
Using formula（1）And formula（2）It is derived by formula（3）, calculate the weight/mass percentage composition W of moisture in insulating paperpaper
,
（3）；
Formula（1）And formula（2）Middle parameter A, B, the testing process of c and n comprise the following steps：
（x1）The insulating oil being dried and insulating paper are 18 according to mass ratio:1 ratio mixing is placed in open glass bottle, then
Open glass bottle is placed in standing 72h in insulating box, the temperature of regulating thermostatic case is 40 DEG C simultaneously；
（x2）Aqueous glycerol solution is placed in glassware, perforated baffle is placed in the top of glassware, then by vierics
Ware is placed in insulating box together with perforated baffle, open glass bottle is placed in the top of perforated baffle；
（x3）By the humiture recorder real-time monitoring insulating box outside the Temperature Humidity Sensor that is placed in insulating box and insulating box
In temperature and relative humidity：Temperature first in regulating thermostatic case is 10 DEG C, adjusts according to ASTM D5032-2011 operational procedure
Relative humidity in section insulating box, after moisture after insulating oil and insulating paper reach poised state, using corneometer
Sporadically measure the moisture in insulating oil and insulating paper；Then the temperature in regulating thermostatic case is 20 DEG C ~ 100 successively
DEG C, the 10 DEG C of regulating thermostatic casees in interval once, after moisture after insulating oil and insulating paper reach poised state, sporadically measure absolutely
Moisture in edge oil and insulating paper；
（x4）Insulating oil and insulating paper are dried after process, in insulating oil, moisture is less than 10ppm, moisture in insulating paper
Content is less than 0.4%；Temperature in regulating thermostatic case is 10 DEG C, and relative humidity is 60%；When the humiture recorder outside insulating box
When display relative humidity is a constant numerical value, the moisture in insulating oil reaches saturation, measures the moisture in insulating oil
Water saturation solubility in content, as insulating oil；Then the temperature in test insulating box is exhausted when 15 DEG C ~ 100 DEG C respectively
Edge water content in oil saturation solubility, the test of 5 DEG C of interval is once.
2. the method that in application insulating oil according to claim 1, moisture measures moisture in insulating paper, it is special
Levy and be：Described temperature T is 10 DEG C ~ 100 DEG C.
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| CN105424890B (en) * | 2015-12-16 | 2017-10-03 | 国网山东省电力公司电力科学研究院 | A kind of improved transformer insulating paper moisture appraisal procedure |
| CN105738454B (en) * | 2016-03-08 | 2018-04-13 | 国网福建省电力有限公司 | Water content computational methods in a kind of insulating paper based on insulating oil compensation of ageing |
| WO2017213116A1 (en) * | 2016-06-07 | 2017-12-14 | 三菱電機株式会社 | Temperature estimation method |
| CN106680351A (en) * | 2016-11-24 | 2017-05-17 | 清华大学 | On-line dynamic measurement device used for micro-water content in insulation oil paper |
| US11486939B2 (en) * | 2017-07-09 | 2022-11-01 | Aurtra Pty Ltd | System and method of determining age of a transformer |
| CN107505429A (en) * | 2017-07-27 | 2017-12-22 | 广西中烟工业有限责任公司 | A kind of Karl_Fischer method measure electronic cigarette W/O divides content |
| CN107515293B (en) * | 2017-08-24 | 2019-09-06 | 西南交通大学 | A kind of tractive transformer insulating paper water content evaluation method considering active time |
| CN108760423B (en) * | 2018-05-25 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | Quantitative control device for oiled paper insulation moisture of headspace type gas-containing method |
| CN111613398B (en) * | 2020-06-04 | 2021-06-18 | 重庆大学 | Method for improving stability of vegetable insulating oil based on pulse thermal aging |
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| US6779385B2 (en) * | 2002-07-15 | 2004-08-24 | Michel Belanger | Method and device for monitoring moisture content of an immersed solid dielectric material |
| JP2004061384A (en) * | 2002-07-30 | 2004-02-26 | Yuka Ind:Kk | Method for inferring moisture content of insulating paper in oil-filled electric device and diagram for inferring used for the same |
| CN102062746A (en) * | 2010-11-09 | 2011-05-18 | 西南交通大学 | Method for measuring oiled paper insulated micro water content on basis of dielectric response |
| CN102023201A (en) * | 2010-11-09 | 2011-04-20 | 西南交通大学 | Method for testing time constant of change of water content in insulation paper of oil immersed type power equipment |
| JP5704965B2 (en) * | 2011-02-28 | 2015-04-22 | 東北電力株式会社 | Remaining life diagnosis method for power transformers using press board or winding insulation paper |
| CN102830153B (en) * | 2012-09-25 | 2014-10-15 | 西南交通大学 | Device for detecting correlation between paper oil insulation micro-water distribution and dielectric response |
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