CN106338511A - Device and method for automatically testing acid value of insulation paper for transformer - Google Patents
Device and method for automatically testing acid value of insulation paper for transformer Download PDFInfo
- Publication number
- CN106338511A CN106338511A CN201610826039.8A CN201610826039A CN106338511A CN 106338511 A CN106338511 A CN 106338511A CN 201610826039 A CN201610826039 A CN 201610826039A CN 106338511 A CN106338511 A CN 106338511A
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- insulating paper
- acid
- extraction
- spectrophotometer
- wavelength
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
Abstract
The invention relates to a device and a method for automatically testing the acid value of insulation paper for a transformer. The device comprises a control module, a spectrophotometer and an AD (analog-digital) converter, wherein the output of the spectrophotometer is connected with the control module through the AD converter; and a cuvette for containing a to-be-tested insulation paper sample extracting acid chromophoric solution is placed on a cassette of the spectrophotometer. According to a principle that the low-molecular-weight water-soluble acid, which the insulation paper for the transformer contains, with different acid values can display different color wavelength when a specific color developing agent is added, the spectrophotometer can detect the wavelength, the AD converter can convert the wavelength electric signals into digital signals and transmit the digital signal to the control module, the control module automatically analyzes and calculates the wavelength signals to obtain test values, and for the test values which exceed a set value, alarm about light ageing, moderate ageing or serious ageing can be sent out correspondingly according to the exceeding degree. Except for a small amount of color developing agent, any other chemical reagents are not added, so the device and the method have the significant advantages of high efficiency, simplicity, environmental friendliness and the like.
Description
Technical field
The present invention relates to acid value measuring device in transformer insulating paper, particularly a kind of automatic testing transformer insulating paper
Acid number device and method.
Background technology
Layer insulating paper is to ensure that the most important factor that transformer safety is run, and insulating paper Long term immersion is in transformator
In oil, fixing, insulation and protective effect are played to Transformer Winding, lead, insulation paper quality is inside transformer material therefor
Short slab, the normal transformator running, its mechanically and electrically the life-span up to more than 70-80, but because insulation paper quality is general
Can only ensure more than 20 year so that transformator whole service life depends on insulating paper, also only more than 20 year.Insulating paper main component
It is lignocellulose, run in long period electric fields and be immersed in the impact of the composite factor such as environment operation in transformer oil, cellulose
High temperature degradation, oxidation Decomposition and acid-catalyzed hydrolysis etc. can be occurred to act on, produce the acid of the small molecules such as formic acid, acetic acid and levulic acid,
The summation of the low molecule water-soluble organic acids such as these aging produced formic acid, acetic acid and levulic acid is referred to as the acid of insulating paper
Value, most small molecule acid are attracted in insulating paper, and are highly soluble in water, with being continuously increased of these small molecule acid,
Can constantly aggravate to produce aging damage effect to insulating paper, form vicious cycle, therefore need transformer insulating paper is sampled
Analysis experiment, is measured to institute's acid number in pattern product, to know insulating paper degree of aging and scope, to aging serious insulation
Paper will give warning in advance, and takes the processing method of partially or fully replacing, reparation it is ensured that transformer safety is run.Fig. 1-3 is to become
Depressor schematic diagram, wherein 1 is transformator；2 is bushing；3 is insulating oil；4 is Transformer Winding；5 is insulating paper；6 is to become
Depressor iron core；7 is securing member；8 is high-voltage connection insulating paper；9 is Transformer Winding high-voltage connection.Conventional insulator paper acid value test
It is to adopt the classical chemical acid alkali titration method carrying out with phenolphthalein as indicator by insulation pattern extract acid, traditional transformer is exhausted
Edge paper acid value test continuous mode is shown in Fig. 4 a-d, and traditional transformer insulating paper acid value test measures, and need to select top pure grade base in advance
Quasi- preparation of reagents standard koh alkali liquor, then titrates insulation pattern extract acid, whole experiment process again with standard koh alkali liquor
Very complicated, work consuming take, and medicine and reagent is more, and not environmentally, are badly in need of a kind of accurate, simple and direct, the quick assay method of energy, figure
In 10 be standard acid number insulation pattern；11 is conical flask；12 is standard acid number insulation pattern extraction acid solution；13 is dropper；
14 is phenolphthalein indicator；15 is base buret；21 is normal concentration koh solution.
Content of the invention
It is an object of the invention to provide a kind of automatic testing transformer insulating paper acid number device and method.
The present invention employs the following technical solutions realization: a kind of automatic testing transformer insulating paper acid number device, it includes
It is previously stored with the control module of standard insulation pattern, spectrophotometer and the ad transducer of acid number known to series；Described light splitting
Photometer output is connected with ad transducer；Described ad transducer is connected with control module through optical fiber；Described spectrophotometer dark
The cuvette holding the sour chromophoric solution of insulation pattern extraction to be measured is placed with box.
Further, also include monitor, the alarm being connected with described control module.
The present invention also provides a kind of method of automatic testing transformer insulating paper acid number, and it comprises the following steps: s1: right
The known difference corresponding series standard wavelength of acid number series standard insulating paper is measured, and measurement result is stored in described control
In molding block；S2: and be respectively provided with that insulating paper is slightly aging according to insulating paper acid number content requirement, mittlere alterung and serious aging
Alarming value, and by series standard insulating paper standard acid number and corresponding standard wave length's relation, and insulating paper is slightly aging, moderate
Aging and serious aging alarming value is pre-stored within described control module；S3: to insulating paper sample acid value measuring to be measured；S4:
Described control module, according to the data prestoring, is carried out in the wavelength digital signal that insulating paper to be measured is extracted with sour chromophoric solution
After automatically analyzing calculating, draw acid number, simultaneously according to acid number content, send normal, slight aging, mittlere alterung or serious respectively
Aging warning warning.
Further, described s1 comprises the following steps: s11: the series standard getting out different acid numbers known to several pieces is exhausted
Edge paper 1g insulation pattern, and be respectively put in each self-corresponding 250ml conical flask, then it is separately added into 50ml distilled water, heating
To 40 DEG C of temperature and keep, gently shake up 5 minutes, fully the acid in extraction insulation pattern simultaneously；S12: respectively use a pipet from
10.0ml is extracted in respective 20ml test tube in each conical flask lower floor extraction acid solution；S13: in each extraction acid solution
In 20ml test tube, add 2～3 visualization Bromocresol green agent, fully shake up, become the sour chromophoric solution of standard insulating paper extraction；
S14: draw the extraction acid colour developing of 5ml standard insulating paper respectively from the 20ml test tube respectively having added developer with b pipet more molten
Liquid, adds in each self-corresponding 5ml cuvette；S15: cuvette is loaded in the magazine of spectrophotometer；S16: open light splitting
Start after photometer, and adjustment stably to carry out wavelength mensure to the extraction acid chromophoric solution loading in magazine cuvette, complete one by one
The sour chromophoric solution wavelength of above series standard insulating paper extraction is become to measure；S17: after the completion of mensure, spectrophotometer will be measured
The wavelength signal of telecommunication is automatically delivered to ad transducer；S18:ad transducer enters transmitting, by spectrophotometer, the wavelength signal of telecommunication coming
Row amplifies, and transmits to control module after being converted to digital signal.
Further, s3 comprises the following steps: s31: after the insulation pattern taking out in transformator is processed on request, enters
Row insulating paper extract acid value measuring；S32: weigh 1g insulating paper to be measured pattern, and put in 250ml conical flask, add
50ml distilled water, is heated to 40 DEG C of temperature and keeps, and gently shakes up 5 minutes simultaneously, fully the acid in extraction insulation pattern；S33:
Extract 10.0ml with a pipet from conical flask lower floor extraction acid solution in 20ml test tube；S34: in extraction acid solution
In 20ml test tube, add 2～3 visualization Bromocresol green agent to 20ml test tube, shake up；S35: use b pipet from again plus
Enter to draw the sour chromophoric solution of 5ml extraction in the 20ml test tube of developer, add in 5ml cuvette；S36: cuvette is loaded and divides
In the magazine of light photometer；S37: start to be measured in magazine cuvette to loading after opening spectrophotometer, and adjustment stably
The sour chromophoric solution of insulating paper extraction carries out developing wavelength mensure；S38: insulating paper extraction acid to be measured is measured by spectrophotometer aobvious
A value between the wavelength 597-492nm of color solution, is gone out the acid number of insulating paper to be measured by control module automatic measurement ＆ calculation.
Compared with prior art, present invention acid according to contained by layer insulating paper is most is low molecule water solublity
Acid, its acid number content and extraction water solution ph can assume the principle of certain corresponding relation, by accurate in advance under certain condition
Really measure insulating paper acid number known to series and the corresponding developing wavelength extracting sour chromophoric solution, and prestore in the control module
Acid number and the corresponding relation of the sour chromophoric solution developing wavelength of extraction, in the acid value measuring to unknown insulating paper, only need simple
Measure the developing wavelength of the sour chromophoric solution of its extraction, row insulating paper acid number is prestored by control module and corresponding extraction acid is aobvious
The developing wavelength of color solution, reversely obtains the accurate acid number of insulating paper, compared with traditional transformer insulating paper acid value test mensure,
Preparating acid, alkali standard solution need not be repeated, without repeating acid base titration, there are efficient, simple and direct, quick, energy-conserving and environment-protective
Deng remarkable advantage.
Brief description
Fig. 1 is schematic diagram when inside transformer soaks insulating oil；
Fig. 2 is inside transformer high-tension coil, iron core, high-voltage connection, insulating paper schematic diagram；
Fig. 3 is inside transformer high-tension coil, iron core, high-voltage connection and insulating paper schematic side view；
Fig. 4 is the conventional acid-base titration experiment work process schematic of the layer insulating paper acid number of the embodiment of the present invention；
Fig. 5 is the sour chromophoric solution preparation experiment work of known difference acid number series standard insulating paper extraction of the embodiment of the present invention
Journey schematic diagram；
Fig. 6 is the sour chromophoric solution wavelength determination test work process schematic diagram of insulating paper extraction of the embodiment of the present invention；
Fig. 7 is the insulating paper extraction to be measured sour chromophoric solution preparation experiment work process schematic of the embodiment of the present invention.
Diagram:
1- transformator；2- bushing；3- insulating oil；4- Transformer Winding；5- insulating paper；6- transformer core；7- securing member；
8- high-voltage connection insulating paper；9- Transformer Winding high-voltage connection；10- standard acid number insulation pattern；11- conical flask；12- standard
Acid number insulation pattern extraction acid solution；13- dropper；14- phenolphthalein indicator；15- base buret；16- pipet；17- test tube；
18- visualization Bromocresol green agent；The sour chromophoric solution of 19- standard acid number insulation pattern extraction；20- insulation to be measured pattern；21- standard is dense
Degree koh solution；22- insulation to be measured pattern extraction acid solution；The sour chromophoric solution of 23- insulation to be measured pattern extraction；24- cuvette；
25-b pipet；26- spectrophotometer magazine.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described.
A kind of automatic testing transformer is as follows with insulating paper acid number device using method:
The present invention provides a kind of automatic testing transformer insulating paper acid number device, and it includes being previously stored with acid number known to series
Standard insulate the control module of pattern, spectrophotometer and ad transducer；Described spectrophotometer output is with ad transducer even
Connect；Described ad transducer is connected with control module through optical fiber；It is placed with the magazine of described spectrophotometer and hold insulation to be measured
The cuvette of the sour chromophoric solution of pattern extraction.
Further, also include monitor, the alarm being connected with described control module.
The present invention also provides a kind of method of automatic testing transformer insulating paper acid number, and it comprises the following steps: s1: right
The known difference corresponding series standard wavelength of acid number series standard insulating paper is measured, and measurement result is stored in described control
In molding block；S2: and be respectively provided with that insulating paper is slightly aging according to insulating paper acid number content requirement, mittlere alterung and serious aging
Alarming value, and by series standard insulating paper standard acid number and corresponding standard wave length's relation, and insulating paper is slightly aging, moderate
Aging and serious aging alarming value is pre-stored within described control module；S3: to insulating paper sample acid value measuring to be measured；S4:
Described control module, according to the data prestoring, is carried out in the wavelength digital signal that insulating paper to be measured is extracted with sour chromophoric solution
After automatically analyzing calculating, draw acid number, simultaneously according to acid number content, send normal, slight aging, mittlere alterung or serious respectively
Aging warning warning.
Specific embodiment is referring to such as 5-7.
The wherein known difference corresponding series standard wavelength of acid number series standard insulating paper measures referring to Fig. 5-6, specifically side
Method is as follows:
The 1.1 series standard insulating paper 1g insulation patterns 10 getting out known to several pieces different acid numbers, and be respectively put into each right
In the 250ml conical flask 11 answered, it is separately added into 50ml distilled water, is heated to 40 DEG C of temperature and keeps, gently shake up 5 points simultaneously
Clock, the acid that fully extraction standard insulate in pattern 10；
1.2 use a pipet 16 to extract from each conical flask 11 lower floor's standard acid number insulating paper extraction acid solution 12 respectively
10.0ml is in respective 20ml test tube 17；
1.3, in each extraction acid solution 20ml test tube 17, add 2～3 visualization Bromocresol green agent 18, fully shake up, become
The sour chromophoric solution 19 of standard acid number insulating paper extraction；
1.4 draw the sour chromophoric solution 19 of 5ml extraction respectively with b pipet 25 again from the 20ml test tube 7 respectively having added developer,
Add in each self-corresponding 5ml cuvette 24；
1.5 load cuvette 24 in the magazine 26 of spectrophotometer；
1.6 unlatching spectrophotometers, and start after adjustment stably to the extraction acid chromophoric solution 19 loading in magazine cuvette 24
Carry out wavelength mensure；
After the completion of 1.7 mensure, the wavelength the being measured signal of telecommunication is automatically delivered to ad transducer by spectrophotometer；
1.8 ad transducers are amplified transmitting, by spectrophotometer, the wavelength signal of telecommunication coming, and are converted to biography after digital signal
Transport to control module；
1.9 control modules are to above series standard insulating paper standard acid number and corresponding standard wave length, and contained according to insulating paper acid number
Amount requires to be respectively provided with that insulating paper is slightly aging, the alarming value of mittlere alterung and serious aging；
1.10 by series standard insulating paper standard acid number and corresponding standard wave length's relation, and insulating paper is slightly aging, moderate is old
Change and the alarming value of serious aging is stored in described control module；
2nd, insulation pattern acid value measuring and comparing to be measured, is shown in Fig. 7, Fig. 6, detailed process is as follows:
After 2.1 pairs of insulation patterns 20 to be measured taking out in transformator are processed on request, carry out insulating paper extract acid value measuring；
2.2 weigh 1g insulating paper to be measured pattern 20, and put in 250ml conical flask 11, add 50ml distilled water, are heated to
40 DEG C of temperature simultaneously keep, and gently shake up 5 minutes simultaneously, fully the acid in extraction insulation to be measured pattern 20；
2.3 use a pipet 16 to extract 10.0ml in 20ml from conical flask 11 lower floor insulation to be measured pattern extraction acid solution 22
In test tube 17；
2.4 extract in acid solution 20ml test tube 17 in insulating paper to be measured, add 2～3 visualization Bromocresol green agent 18 to
In 20ml test tube 17, fully shake up, it is molten that now insulating paper to be measured extraction acid solution 22 is changed into insulating paper extraction acid colour developing to be measured
Liquid 23；
2.5 draw the extraction acid colour developing of 5ml insulating paper to be measured with b pipet 25 again from the 20ml test tube 17 adding developer
Solution 23, adds in 5ml cuvette 24；
2.6. cuvette 24 is loaded in the magazine 26 of spectrophotometer；
2.7 unlatching spectrophotometers, and adjustment stable after start to the insulating paper extraction acid to be measured loading in magazine cuvette 24
Chromophoric solution 23 carries out developing wavelength mensure；
2.8 wavelength measured are gone out the acid number of insulating paper to be measured by control module automatic measurement ＆ calculation；
2.9 acid numbers such as measured exceed arranges value, the degree that control module exceedes according to acid number content, control alarm respectively
Send the warning warning of slightly aging, mittlere alterung or serious aging.
The foregoing is only presently preferred embodiments of the present invention, all impartial changes done according to scope of the present invention patent with
Modify, all should belong to the covering scope of the present invention.
Claims (5)
1. a kind of automatic testing transformer insulating paper acid number device it is characterised in that: include being previously stored with known to series acid
The control module of standard insulation pattern of value, spectrophotometer and ad transducer；Described spectrophotometer output and ad transducer
Connect；Described ad transducer is connected with control module through optical fiber；Be placed with the magazine of described spectrophotometer hold to be measured absolutely
The cuvette of the sour chromophoric solution of edge pattern extraction.
2. automatic testing transformer insulating paper acid number device according to claim 1 it is characterised in that: also include and institute
State monitor, the alarm of control module connection.
3. a kind of method of automatic testing transformer insulating paper acid number it is characterised in that: comprise the following steps:
S1: the known difference corresponding series standard wavelength of acid number series standard insulating paper is measured, and measurement result is deposited
It is stored in described control module；
S2: and be respectively provided with that insulating paper is slightly aging according to insulating paper acid number content requirement, the report of mittlere alterung and serious aging
Alert value, and by series standard insulating paper standard acid number and corresponding standard wave length's relation, and insulating paper is slightly aging, mittlere alterung
It is pre-stored within described control module with the alarming value of serious aging；
S3: to insulating paper sample acid value measuring to be measured；
S4: described control module is according to the data prestoring, digital in the wavelength that insulating paper to be measured is extracted with sour chromophoric solution
After signal carries out automatically analyzing calculating, draw acid number, simultaneously according to acid number content, send respectively normal, slightly aging, moderate old
Change or the warning of serious aging warns.
4. automatic testing transformer according to claim 3 with the method for insulating paper acid number it is characterised in that: described s1 bag
Include following steps:
S11: get out known to several pieces the series standard insulating paper 1g insulation pattern of different acid numbers, and be respectively put into and each correspond to
250ml conical flask in, then be separately added into 50ml distilled water, be heated to 40 DEG C of temperature and keep, gently shake up 5 points simultaneously
Acid in clock, fully extraction insulation pattern；
S12: use a pipet to extract 10.0ml from each conical flask lower floor extraction acid solution respectively and try in respective 20ml
Guan Zhong；
S13: in each extraction acid solution 20ml test tube, add 2～3 visualization Bromocresol green agent, fully shake up, become standard
The sour chromophoric solution of insulating paper extraction；
S14: draw the extraction acid of 5ml standard insulating paper respectively from the 20ml test tube respectively having added developer with b pipet more aobvious
Color solution, adds in each self-corresponding 5ml cuvette；
S15: cuvette is loaded in the magazine of spectrophotometer；
S16: start after opening spectrophotometer, and adjustment stably the extraction acid chromophoric solution loading in magazine cuvette is carried out
Wavelength measures, and completes the sour chromophoric solution wavelength of above series standard insulating paper extraction one by one and measures；
S17: after the completion of mensure, the wavelength the being measured signal of telecommunication is automatically delivered to ad transducer by spectrophotometer；
S18:ad transducer is amplified transmitting, by spectrophotometer, the wavelength signal of telecommunication coming, and after being converted to digital signal
Transmit to control module.
5. automatic testing transformer insulating paper acid number according to claim 3 method it is characterised in that: s3 includes
Following steps:
S31: after the insulation pattern taking out in transformator is processed on request, carry out insulating paper extract acid value measuring；
S32: weigh 1g insulating paper to be measured pattern, and put in 250ml conical flask, add 50ml distilled water, be heated to 40 DEG C
Temperature simultaneously keeps, and gently shakes up 5 minutes simultaneously, fully the acid in extraction insulation pattern；
S33: extract 10.0ml in 20ml test tube from conical flask lower floor extraction acid solution with a pipet；
S34: in extraction acid solution 20ml test tube, add 2～3 visualization Bromocresol green agent to 20ml test tube, shake up；
S35: draw the sour chromophoric solution of 5ml extraction from the 20ml test tube adding developer with b pipet again, add to 5ml ratio
In color ware；
S36: cuvette is loaded in the magazine of spectrophotometer；
S37: open spectrophotometer, and adjustment stable after start aobvious to the insulating paper extraction acid to be measured loading in magazine cuvette
Color solution carries out developing wavelength mensure；
S38: the wavelength of the sour chromophoric solution of insulating paper to be measured extraction between 597-492nm is measured by spectrophotometer
Individual value, is gone out the acid number of insulating paper to be measured by control module automatic measurement ＆ calculation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610826039.8A CN106338511A (en) | 2016-09-18 | 2016-09-18 | Device and method for automatically testing acid value of insulation paper for transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610826039.8A CN106338511A (en) | 2016-09-18 | 2016-09-18 | Device and method for automatically testing acid value of insulation paper for transformer |
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| Publication Number | Publication Date |
|---|---|
| CN106338511A true CN106338511A (en) | 2017-01-18 |
Family
ID=57839059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610826039.8A Pending CN106338511A (en) | 2016-09-18 | 2016-09-18 | Device and method for automatically testing acid value of insulation paper for transformer |
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Citations (8)
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| CN2030721U (en) * | 1988-05-03 | 1989-01-11 | 张�杰 | Ph photoelectric integral test and control device |
| CN101675331A (en) * | 2007-05-07 | 2010-03-17 | 通用电气公司 | Method and apparatus for measuring ph of low alkalinity solutions |
| CN102735682A (en) * | 2012-06-12 | 2012-10-17 | 广东电网公司电力科学研究院 | Accurate and simple transformer oil acid value detection method |
| GB201317332D0 (en) * | 2013-07-19 | 2013-11-13 | Verenium Corp | Colorimetric Phytic Acid Assay |
| CN103592246A (en) * | 2013-11-22 | 2014-02-19 | 武汉友芝友医疗科技有限公司 | Body fluid pH value test method and device |
| CN103760160A (en) * | 2014-01-25 | 2014-04-30 | 福州大学 | Colorimetric detection method of hydrogen peroxide |
| CN103954729A (en) * | 2014-05-19 | 2014-07-30 | 国家电网公司 | Method for measuring acid value in insulation paper for oil immersible power transformer |
| CN206095949U (en) * | 2016-09-18 | 2017-04-12 | 国网福建省电力有限公司 | Automatic insulated paper acid number device for testing transformer |
-
2016
- 2016-09-18 CN CN201610826039.8A patent/CN106338511A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2030721U (en) * | 1988-05-03 | 1989-01-11 | 张�杰 | Ph photoelectric integral test and control device |
| CN101675331A (en) * | 2007-05-07 | 2010-03-17 | 通用电气公司 | Method and apparatus for measuring ph of low alkalinity solutions |
| CN102735682A (en) * | 2012-06-12 | 2012-10-17 | 广东电网公司电力科学研究院 | Accurate and simple transformer oil acid value detection method |
| GB201317332D0 (en) * | 2013-07-19 | 2013-11-13 | Verenium Corp | Colorimetric Phytic Acid Assay |
| CN103592246A (en) * | 2013-11-22 | 2014-02-19 | 武汉友芝友医疗科技有限公司 | Body fluid pH value test method and device |
| CN103760160A (en) * | 2014-01-25 | 2014-04-30 | 福州大学 | Colorimetric detection method of hydrogen peroxide |
| CN103954729A (en) * | 2014-05-19 | 2014-07-30 | 国家电网公司 | Method for measuring acid value in insulation paper for oil immersible power transformer |
| CN206095949U (en) * | 2016-09-18 | 2017-04-12 | 国网福建省电力有限公司 | Automatic insulated paper acid number device for testing transformer |
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| L.休哈 等著: "《分析化学中的溶液平衡》", 30 June 1979, 人民教育出版社 * |
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Application publication date: 20170118 |
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