CN103954729A - Method for measuring acid value in insulation paper for oil immersible power transformer - Google Patents
Method for measuring acid value in insulation paper for oil immersible power transformer Download PDFInfo
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- CN103954729A CN103954729A CN201410209811.2A CN201410209811A CN103954729A CN 103954729 A CN103954729 A CN 103954729A CN 201410209811 A CN201410209811 A CN 201410209811A CN 103954729 A CN103954729 A CN 103954729A
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Abstract
The invention provides a method for measuring an acid value in an insulation paper for an oil immersible power transformer. The method comprises the steps of pretreatment of paper, extraction of acid components in the paper, measurement of an acid value of an extracting solution, and calculation of the acid value in the paper. The method is simple to operate, and convenient to achieve, and the problem of measurement of the acid value content in the tested insulation paper can be effectively solved.
Description
Technical field
The invention belongs to acid number field of measuring technique in paper, be specifically related to a kind of method of acid number in insulating paper for oil-immersed power transformer of measuring.
Background technology
Oil-immersed power transformer oil-Aging of Oil-paper Insulation in Oil can produce organic acid, to acid number in oil, paper, measures evaluating oil-paper insulation system aging degree significant.The standard method of not measuring acid number in paper at present, but the measuring method comparative maturity of acid number in oil.
In oil, the principle of acid number measuring method foundation is acid base titration, is in oil sample, to drip the alcoholic solution of certain density potassium hydroxide that the volume that during according to titration end-point, aqueous slkali consumes calculates acid number in oil.Different according to the determination methods of titration end-point, in oil, acid number measuring method can be divided into potentiometric titration and indicator (BTB) method.Potentiometric titration consumes the change curve of volume by recording oil sample current potential in titration process with aqueous slkali, using potential jump point as titration end-point; Indicator (BTB) method is used bromine thyme phenol blue (BTB) as indicator, BTB is a kind of acid base indicator, color change interval is that 6.0(is yellow)-7.6(is blue), near neutral region variable color sensitive, indicator reaches titration end-point while becoming blue-green (considering the impact of oil sample color).
Insulating paper decomposes the little molecule carboxylic acids such as generation formic acid, acetic acid and laevulic acid in ageing process, dissolves each other with water, and therefore external researcher proposes, and uses acid number in distilled water extraction paper, and the rear method according to acid number in measurement oil is measured acid number in paper.But do not provide for concrete measuring method.
Measure indicator (BTB) method of acid number in oil due to easy to operate, effectively simple, be widely used at present kiowatt and production division, the present invention uses for reference acid number BTB method in oil, in conjunction with foreign scholar's achievement in research, a kind of method that oil-immersed power transformer is measured with acid number in insulating paper is proposed.
Summary of the invention
The object of the present invention is to provide a kind of method of acid number in insulating paper for oil-immersed power transformer of measuring, method is simple, be conducive to apply.
For achieving the above object, the present invention adopts following technical scheme:
A kind ofly measure that oil-immersed power transformer comprises the extraction of sour composition in the pre-service, paper of paper by the method for acid number in insulating paper, the calculating of acid number in the measurement of extract acid number, paper;
The pre-service of described paper: with cotton wiping insulating paper to be measured surface, as far as possible remove the transformer oil that is attached to insulating paper surface;
The extraction of sour composition in described paper: by 6h in the complete submergence pure water of insulating paper, by acid extraction in paper in pure water;
The measurement of described extract acid number: adopt the method for acid base titration, measure the acid number of extract;
The calculating of acid number in described paper: according to surveyed extract acid number and insulating paper quality, and get rid of the impact of acid number etc. in pure water, acid number in computation paper.
During pre-service, the transformer oil with cotton wiping insulating paper surface, takes the insulating paper that two parts of quality are respectively 2g, after a paper is wherein cleaned with sherwood oil, dries, and claims its quality to be
mg, gets rid of and is attached to the oily quality on insulating paper thus.
Unwashed another part of insulating paper put into 100g pure water, at 25 ℃, schedule to last the extraction of acid in the paper of 6h.
Take extract 8.00-10.00g, add isopropyl alcohol 50mL, after fully mixing, add 0.2mLBTB indicator, with potassium hydroxide aqueous isopropanol, be titrated to blueness as early as possible, write down the volume of the potassium hydroxide aqueous isopropanol of consumption.Get isopropyl alcohol 50mL and carry out after same operation (blank titration), calculate the acid number of extract.
Take pure water 8.00-10.00g, add isopropyl alcohol 50mL, after fully mixing, add 0.2mLBTB indicator, with potassium hydroxide aqueous isopropanol, be titrated to blueness as early as possible, write down the volume of the potassium hydroxide aqueous isopropanol of consumption, calculate the acid number of pure water.
According to acid number in the acid number computation paper of the quality of the acid number of surveyed extract, paper and pure water.
Remarkable advantage of the present invention is: simple to operate, it is convenient to realize, and can effectively solve the measurement problem of acid number content in tested insulating paper.
Embodiment
A kind of oil-immersed power transformer of measuring comprises the following steps by the method for acid number in insulating paper:
For preventing that with an organic solvent cleaning the transformer oil adhering in insulating paper causes losing acid number in paper, only use cotton wiping insulating paper surface transformer oil;
Insulating paper quality obtains through following methods: after the cotton wiping of learning from else's experience, with the pattern of the quality such as surveyed insulating paper, through sherwood oil, clean and survey its quality after drying and be surveyed insulating paper quality;
For reducing the impact of external environment on minute extraction of acid in paper, use 125mL extraction flask, add 100mL pure water, grinding port plug extracts under 25 ℃ of constant temperature beyond the Great Wall;
The acid number of extract is found when measuring different extraction time, and during 6h, extract acid number is maximum, and therefore selected 6h is extraction time;
For reducing the impact that in oil, acid number is measured extract acid number, during sampling, taking off a layer extract measures, this is because the sour composition in oil sample is stearic acid, is dissolved in transformer oil and floats on extract upper strata, takes off the impact that layer solution can effectively be got rid of acid in oil;
Because acid in paper is the little molecule carboxylic acids such as formic acid, acetic acid and laevulic acid, be heated volatile, so extraction temperature and titration temperature are all selected 25 ℃;
Because isopropyl alcohol can be well miscible and intrinsic basicity is high with moisture, there is good molten sour ability, therefore in measuring paper, in the process of acid number, adopt aqueous isopropanol as titration solvent;
The acid number of extractant pure water also can affect the measurement of acid number in paper, should give consideration during calculating.
Embodiment 1
Table 1 instrument and reagent
Preparation and demarcation 0.02-0.05mol/L potassium hydroxide aqueous isopropanol
1) preparation.Weigh in the balance and get about 3gKOH in beaker, adding appropriate isopropyl alcohol analyzes pure, it is dissolved, then packs in 1000mL volumetric flask, and by isopropanol to scale mark, shake up, if the solution of joining, because there being sal tartari muddy, should be placed and spend the night, precipitation is separated out completely, then by the mode of siphon, pack supernatant liquor into another reagent bottle, then it is standby with Potassium Hydrogen Phthalate standardization of solution, to go out accurate concentration.
2) demarcate.Take Potassium Hydrogen Phthalate 0.15-0.20g(through 110 ℃ of dry 1h accurately to 0.0002g), with water recently distilled, dissolve, be heated to boil, add 2-3 to drip phenolphthalein indicator, with potassium hydroxide aqueous isopropanol, be titrated to solution and be rose pink.By formula 1, calculate potassium hydroxide aqueous isopropanol concentration
c,
（1）
In formula:
c---the volumetric molar concentration of KOH aqueous isopropanol, mol/L;
g---the quality of Potassium Hydrogen Phthalate, g;
v---consume the volume of KOH aqueous isopropanol, mL;
204.2---the molal weight of Potassium Hydrogen Phthalate, g/mol.
Testing procedure and requirement
1) with the transformer oil on cotton wiping insulating paper surface, take the insulating paper that two parts of quality are respectively 2g, after a paper is wherein cleaned with sherwood oil, dry, claim its quality to be
mg, after unwashed another part of insulating paper put into 100g pure water, the extraction of acid in 25 ℃ of paper that schedule to last 6h;
2) with conical flask, take the extract 8-10g(of lower floor accurately to 0.01g);
3) measure isopropyl alcohol 50mL, pour in above-mentioned conical flask, rock concussion, after fully mixing, add 0.2mLBTB indicator, with potassium hydroxide aqueous isopropanol, be titrated to blueness as early as possible, write down the amount of the potassium hydroxide aqueous isopropanol of consumption
v 1;
4) get isopropyl alcohol 50mL and carry out blank titration by step 3), write down the amount of the potassium hydroxide aqueous isopropanol of consumption
v 0;
5) by formula (2), calculate extract acid number.
（2）
6) repeating step 3), 4), 5), measure acid number in pure water.
（3）
7) press acid number in following formula (4) computation paper
（4）
In formula:
x---the acid number in paper, mgKOH/g;
x 1---the acid number of the extract of paper;
x 2---the acid number in pure water;
m---the quality of insulating paper, g;
v 1---the amount of the potassium hydroxide aqueous isopropanol that titration formation testing consumes, mL;
v 2---the amount of the potassium hydroxide aqueous isopropanol that titration pure water consumes, mL;
v 0---the amount of the blank potassium hydroxide aqueous isopropanol that consumes of titration, mL;
c---the concentration of potassium hydroxide aqueous isopropanol, mol/L;
56.1---the molal weight of potassium hydroxide, g/mol;
g 1---the quality of extract;
g 2---the quality of pure water liquid.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (6)
1. measure a method for acid number in insulating paper for oil-immersed power transformer, it is characterized in that: comprise the extraction of sour composition in the pre-service, paper of paper, the calculating of acid number in the measurement of extract acid number, paper;
The pre-service of described paper: with cotton wiping insulating paper to be measured surface, as far as possible remove the transformer oil that is attached to insulating paper surface;
The extraction of sour composition in described paper: by 6h in the complete submergence pure water of insulating paper, by acid extraction in paper in pure water;
The measurement of described extract acid number: adopt the method for acid base titration, measure the acid number of extract;
The calculating of acid number in described paper: according to surveyed extract acid number and insulating paper quality, and get rid of the impact of acid number in pure water, acid number in computation paper.
2. the method for acid number in insulating paper for measurement oil-immersed power transformer according to claim 1, it is characterized in that: during pre-service, transformer oil with cotton wiping insulating paper surface, take the insulating paper that two parts of quality are respectively 2g, after a paper is wherein cleaned with sherwood oil, dry, claim its quality to be
mg, gets rid of and is attached to the oily quality on insulating paper thus.
3. the method for acid number in insulating paper for measurement oil-immersed power transformer according to claim 1, is characterized in that: unwashed another part of insulating paper put into 100g pure water, schedule to last sour extraction in the paper of 6h at 25 ℃.
4. the method for acid number in insulating paper for measurement oil-immersed power transformer according to claim 1, it is characterized in that: take the extract 8.00-10.00g of lower floor, add isopropyl alcohol 50mL, after fully mixing, add 0.2mLBTB indicator, with potassium hydroxide aqueous isopropanol, be titrated to blueness as early as possible, write down the volume of the potassium hydroxide aqueous isopropanol of consumption; Get isopropyl alcohol 50mL and carry out after blank titration, calculate the acid number of extract.
5. the method for acid number in insulating paper for measurement oil-immersed power transformer according to claim 1, it is characterized in that: take pure water 8.00-10.00g, add isopropyl alcohol 50mL, after fully mixing, add 0.2mLBTB indicator, with potassium hydroxide aqueous isopropanol, be titrated to blueness as early as possible, write down the volume of the potassium hydroxide aqueous isopropanol of consumption, calculate the acid number of pure water.
6. the method for acid number in insulating paper for measurement oil-immersed power transformer according to claim 1, is characterized in that: according to acid number in the acid number computation paper of the quality of the acid number of surveyed extract, paper and pure water.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569320A (en) * | 2015-02-13 | 2015-04-29 | 苏州热工研究院有限公司 | Method of measuring water content in insulated paper by applying acid value and water content in insulating oil |
| CN106338512A (en) * | 2016-09-18 | 2017-01-18 | 国网福建省电力有限公司 | Acid content measurement device for insulating paper for electric power high voltage oil-filled equipment and implementation method of acid content measurement device |
| CN106338511A (en) * | 2016-09-18 | 2017-01-18 | 国网福建省电力有限公司 | Device and method for automatically testing acid value of insulation paper for transformer |
| CN108896701A (en) * | 2018-06-06 | 2018-11-27 | 浙江诺亚氟化工有限公司 | The measuring method of micro acid value in a kind of perfluor -2- methyl-propione |
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| CN104569320A (en) * | 2015-02-13 | 2015-04-29 | 苏州热工研究院有限公司 | Method of measuring water content in insulated paper by applying acid value and water content in insulating oil |
| CN106338512A (en) * | 2016-09-18 | 2017-01-18 | 国网福建省电力有限公司 | Acid content measurement device for insulating paper for electric power high voltage oil-filled equipment and implementation method of acid content measurement device |
| CN106338511A (en) * | 2016-09-18 | 2017-01-18 | 国网福建省电力有限公司 | Device and method for automatically testing acid value of insulation paper for transformer |
| CN108896701A (en) * | 2018-06-06 | 2018-11-27 | 浙江诺亚氟化工有限公司 | The measuring method of micro acid value in a kind of perfluor -2- methyl-propione |
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| CN103954729B (en) | 2015-08-12 |
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