CN106370613A - Spectrum system and method for directly measuring concentration of furfural in transformer oil - Google Patents
Spectrum system and method for directly measuring concentration of furfural in transformer oil Download PDFInfo
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- CN106370613A CN106370613A CN201610990051.2A CN201610990051A CN106370613A CN 106370613 A CN106370613 A CN 106370613A CN 201610990051 A CN201610990051 A CN 201610990051A CN 106370613 A CN106370613 A CN 106370613A
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- furfural
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- oil
- oil sample
- absorption cell
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- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 title claims abstract description 139
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000001228 spectrum Methods 0.000 title abstract description 7
- 230000003287 optical effect Effects 0.000 claims abstract description 44
- 238000002835 absorbance Methods 0.000 claims abstract description 15
- 238000010521 absorption reaction Methods 0.000 claims description 25
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 claims description 18
- 239000013307 optical fiber Substances 0.000 claims description 17
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims description 11
- 229960000583 acetic acid Drugs 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000012362 glacial acetic acid Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 230000003595 spectral effect Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 239000000052 vinegar Substances 0.000 claims 1
- 235000021419 vinegar Nutrition 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract 1
- 210000004027 cell Anatomy 0.000 description 15
- 238000001514 detection method Methods 0.000 description 10
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 238000000605 extraction Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- 230000032683 aging Effects 0.000 description 3
- 238000003556 assay Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000284 extract Substances 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 238000012417 linear regression Methods 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000008033 biological extinction Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 230000007717 exclusion Effects 0.000 description 2
- -1 furan compound Chemical class 0.000 description 2
- 238000004128 high performance liquid chromatography Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000012549 training Methods 0.000 description 2
- 238000011481 absorbance measurement Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000010413 mother solution Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- FHSWXOCOMAVQKE-UHFFFAOYSA-N phenylazanium;acetate Chemical compound CC([O-])=O.[NH3+]C1=CC=CC=C1 FHSWXOCOMAVQKE-UHFFFAOYSA-N 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
-
- 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
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
- G01N2021/3155—Measuring in two spectral ranges, e.g. UV and visible
Abstract
The invention belongs to the monitoring field of electric equipment running states, and particularly relates to a spectrum system and a method for directly measuring the concentration of furfural in transformer oil. The spectrum system comprises a first optical lens, an absorbing pool, a second optical lens and an optical frame, and is ingenious in design, simple in structure, high in sensitivity and convenient to operate. Based on the spectrum system, the method for directly measuring the concentration of furfural in the transformer oil is provided. The spectrum system is adopted for determining the absorbance of the oil sample to be measured, so that the content of furfural in the oil sample to be measured is obtained; it is not needed to extract furfural in the oil, operation is easy and convenient, time and labor are saved, detecting results are real and reliable, the requirement for detecting furfural in the oil is met, heating is not needed during color developing, and therefore operation is easy and convenient.
Description
Technical field
The invention belongs to power equipment monitoring running state technical field is and in particular to a kind of spectroscopic system and direct measurement
The method of furfural content in transformer oil.
Background technology
Transformator is one of most important power equipment of power system, the aging journey of its safe and stable operation and insulator
Degree is closely related.With the increase of the transformer station high-voltage side bus time limit, transformer insulated son will be constantly aging, insulating properties also with
Fall.Analysis judges that an important means of transformer insulated sub- degree of aging is the furfural content in detection transformer oil, at present
The detection method of furfural content in transformer oil mainly has high performance liquid chromatography (hplc method).
High performance liquid chromatography adopts the furfural in methanol or acetonitrile system enrichment oil, often selects methanol aqueous solution as stream
Dynamic phase, selects optimal mobile phase ratio and flow velocity according to experimental result, is detected, then according to color at wavelength 275nm
The area of spectral peak or peak height size carry out quantitation to the furfural in oil.Furfural in DUV area 275nm about have obvious spy
Levy absworption peak, but in oil, also there are multiple materials having uv absorption in 275nm, furfural detection is disturbed.Using height
The furfural content that effect liquid phase method is measured in transformer oil needs expensive equipment, and operating technology level requirement is also higher, no
Only need the pre-treatment of complexity, operating process is also complex, and instrument and operating environment are required higher.In existing oil
Furfural spectrum detection technique is required to furfural in oil is extracted, and operating process is complicated, and exist extraction yield whether stable and
The problems such as whether extraction efficiency is sufficiently high.Therefore, present invention aim at setting up a kind of the furfural in transformer oil need not to be entered
Row extraction, the spectrographic method directly furfural oil sample being used for quickly detecting.
Content of the invention
In view of this, the invention discloses a kind of spectroscopic system and directly mensure transformer oil in furfural content method,
Achieve and the furfural in transformer oil need not be extracted, can directly measure the furfural in transformer oil within 10min
Concentration.
The invention discloses a kind of spectroscopic system for directly measuring furfural content in transformer oil, comprising: the first light
Learn lens, absorption cell, the second optical lenses and optical rack；
Described first optical lenses and the second optical lenses are separately positioned on the both sides of described optical rack, described first optics
The axis of the axis of lens and described second optical lenses mutually coincides；
Described absorption cell is arranged in described optical rack, positioned between described first optical lenses and the second optical lenses.
Preferably, the distance between base of described axis and described optical rack is less than or equal to described absorption cell height
1/3rd.
Preferably, described absorption cell includes body and lid；The outer rim of described lid is provided with silica gel sealing pad；Described absorption cell
For quartz glass absorption cell.
Preferably, described optical rack is to seal system.
Spectroscopic system provided by the present invention also includes: light source, input optical fibre, output optical fibre, micro spectrometer and calculating
Machine；
Described light source connects described input optical fibre；
Described input optical fibre and output optical fibre connect described first lens and the second lens respectively；
Described micro spectrometer connects described output optical fibre and described computer respectively；
The wave-length coverage of described light source is 200-1100nm.
Based on above-mentioned spectroscopic system, the invention also discloses in a kind of direct measurement transformer oil furfural content method,
Comprise the following steps:
Prepare the standard oil sample of different furfural contents, mix homogeneously with developer respectively, standing, using described spectroscopic system
Measure the absorbance of described standard oil sample, draw standard curve；
Oil sample to be measured is mixed homogeneously with developer, standing, the suction of described oil sample to be measured is measured using described spectroscopic system
Luminosity；
Furfural content in described oil sample to be measured is calculated according to described standard curve.
Preferably, described developer includes glacial acetic acid and aniline；The volume ratio of described glacial acetic acid and described aniline is 9:1.
Preferably, described absorbance is maximum absorbance between 512-520nm for the wave-length coverage.
Preferably, the time of described standing is 4-6min.
Preferably, the furfural content of described standard oil sample is 0.1-5mg/l.
A kind of spectroscopic system disclosed in this invention, design is ingenious, and structure is simple, and sensitivity is high, easy to operate；Being based on should
Spectroscopic system, a kind of assay method directly measuring furfural content in transformer oil disclosed in this invention, this method need not be to oil
Middle furfural is extracted, and directly furfural in oil sample is developed the color and detects, and can avoid complicated ingredient in transformer oil
Interference, easy and simple to handle, time saving and energy saving；In the implementation process of the inventive method, extraction step need not be considered whether by oil to be measured
The problem that furfural in sample extracts completely, certainty of measurement is higher, reproducible, and need not heat in process color,
Easy and simple to handle, it is particularly suitable for carrying out the quick measurement of furfural in transformer oil at the scene through simple training personnel.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing providing obtains other accompanying drawings.
The structural representation of the measuring system that Fig. 1 is adopted by the inventive method；
Fig. 2 is the structural representation of absorption cell；
Fig. 3 is the linear regression curves figure of furfural content and absorbance.
Specific embodiment
Below in conjunction with description of the invention accompanying drawing, technical scheme is clearly and completely described it is clear that
Described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Those skilled in the art should manage
Solution, modifies to the specific embodiment of the present invention or some technical characteristics is replaced on an equal basis, without deviating from the present invention
The spirit of technical scheme, all should cover in the scope of protection of the invention.
Dl/t702-1999 " furfural content assay method (spectrophotography) in mineral insulating oil " defines mineral insulation
In oil, it is adaptable to run the detection of the furfural content of Minerals insulating oil, the method adopts water as the assay method of furfural content
Extractant, the furfural in distillation enrichment oil, developer is made with aniline acetate (volume ratio acetic acid: aniline=9:1), aobvious under room temperature
Color, using spectrophotography at wavelength 520nm to insulating oil in furfural be measured." spectrographic method exclusion bht Interference Detection becomes
The further investigation of furfural content in depressor oil " method that gives furfural content in a kind of quick detection transformer oil, the method
With methanol as extractant, furfural in enrichment oil, the interference of hydrocarbons in exclusion oil.Certain by adding in oil sample extract
, there is chromogenic reaction using tba with furfural, absworption peak, root occur at 390nm in 2- thiobarbituricacidα- (tba) solution of amount
It is in good linear relation according to peak height and furfural content, detect furfural content in transformer oil.
Existing furfural spectrum detection technique is required to furfural in oil is extracted, and operating process is complicated, and there is extraction
Taken the problems such as whether stable and whether extraction efficiency is sufficiently high.Therefore, it is an object of the invention to setting up a kind of being used for directly
The method of the furfural content in measuring transformer oil, need not extract to the furfural in oil before measurements, by colour developing
Furfural direct reaction in agent and oil sample, and can effectively exclude the interference of other impurities in oil sample.
Different material is different for the degree of the absorption of the light of different wave length, projection, reflection and refraction, and this phenomenon claims
For the selective absorbing to light for the material.Furfural also known as 2 furan carboxyaldehyde, are that furan compound one kind therein is most important derivative
Thing, can generate a kind of compound of shiny red with aniline reaction, and this compound is the hydroxyl that a kind of absorbing wavelength is 512-520nm
Amylene dianiline dye.Therefore, the furfural in transformer oil can be measured by ultraviolet spectrophotometry and measure change
Furfural content in depressor oil.Using during the method determination sample it is not necessary to add any developer and other reagent to be processed,
Can directly be measured, effectively prevent the interference of other impurities.However, the placement for a long time of this dyestuff can cause oxidation, color
Deepen, affect measurement result, absorbance should be measured as early as possible.
Furfural content in measuring transformer of the present invention oil is adopted system as shown in figure 1, light source in this system
(1) scope comprises 200-1100nm, and input optical fibre (2) and output optical fibre (3) connect the first optical lenses (4) and the second light respectively
Lens (5), the first optical lenses (4) and the second optical lenses (5) are separately positioned on the both sides of optical rack (6), extinction pond (8)
It is removably mounted on optical rack base (7), the outlet of output optical fibre (3) connects micro spectrometer (9), micro spectrometer (9)
It is connected by usb interface with computer (10), computer (10) controls micro spectrometer (9) and carries out data acquisition.In reality
In detection process, optical rack (6) and its base (7) constitute one and seal system, the light of light source introduce input optical fibre (2) and
It is mapped to second optical lenses (5) relative with the first optical lenses by being mapped to absorption cell (8) after the first optical lenses (4) again,
Micro spectrometer (9) receives the light source shooting out from the second optical lenses, micro spectrometer (9) and meter by output optical fibre (3)
Calculation machine (10) is connected by usb interface, and computer (10) controls micro spectrometer (9) and carries out data acquisition.Fig. 2 is absorption cell
(8) structural representation, as shown in Fig. 2 absorption cell includes body (b) and lid (a) composition, adds silica gel close between body and lid
Packing avoids the solution side leakage to be measured in body.Optical absorption pond is made up of quartz glass, the light to 200～1100nm for this material
Ripple has good permeability.D represents optical path length, and d is about 1-20mm；H represents absorption cell height, and l is to absorb pond length, l
More than 10mm；Absorption cell wall thickness is in 1-2mm；Absorption cell volume v=d × l × h, v is more than 20ml and is less than 50ml.Wherein, optical lens
The height h1 of the distance between center line optical rack base plate of mirror 4,5 is not more than 1/3rd of absorption cell height；Whole optical rack (6,7)
Should be the system that seals, constitute a darkroom together.
Embodiment 1
1st, developer and standard oil sample are prepared
(1) prepare developer: 9:1 weighs glacial acetic acid and aniline respectively by volume；Due to heat will be released when both mix
Aniline is blown slowly during preparation and adds in glacial acetic acid by amount, stirring while adding, controls mixeding liquid temperature below 20 DEG C.Preparation finishes
After be placed in shady and cool place preservation be dried, stand-by.Lower of room temperature preserves 8 hours, preserves 3 days 5 DEG C～8 DEG C moment, such as finds color
Turn yellow, should reconfigure.The purity of glacial acetic acid and aniline is 99.5%.
(2) preparation of standard oil sample: take furfural (analyzing pure or chromatographically pure) 10 μ l to be placed in 1l brown volumetric flask, use transformation
Device fresh oil is diluted to 1l, shakes up, the storage mother solution of prepared standard oil sample, and avoid light place is standby two days later.Wherein, in gained oil sample
Furfural content is 11.6mg/l.
Requirement furfural content being measured according to current power department is it is recommended that the standard oil sample furfural content prepared is in 0.1-
5mg/l scope.Take above-mentioned standard storing solution 50ml in 100ml volumetric flask, be diluted to 100ml with fresh oil, be made into concentration about
The standard sample of 5.8mg/l.In this way, 0.116mg/l, 0.58mg/l, 1.16mg/l, 2.32mg/l, 4.64mg/ are configured
The standard oil sample of l, then, by ultrasonic for the oil sample preparing degassing.
2nd, draw the standard curve of furfural content in transformer oil
(1) select capacity to be 30ml light absorbs pond, take 10ml above-mentioned standard oil sample to add in absorbing light pond, add 15ml
Developer, after adding a cover gently overturn absorbing light pond (acutely must not shake volumetric flask, in order to avoid material is mixed in color product in oil,
Impact layered effect) 5-10 time (completing in 1 minute), absorbing light pond is put in optical rack, starts timing, stand 4-6 minute,
Time t (4～6m≤t≤10m) start micro spectrometer carry out all band scanning, spectrogrph using air as blank,
The time of integration is 8ms, and average time is 10, and smoothness is 10.All absorption cell is cleaned with acetone after testing every time.
According to above-mentioned steps, obtain the spectrogram of the above-mentioned other 5 groups of standard oil samples preparing.Due to the colour developing generating
Unstable products, straight line declines absorbance in time, should complete layering and the mensure of absorbance after adding developer as early as possible,
From the time control adding developer to terminate to this color product absorbance measurement within 10min, and for making same standard
The sample of curve and below oil sample to be measured actually detected during, should ensure that complete within the same time period measure, with true
Protect the concordance of experiment condition.
(2) read maximum absorbance at 512-520nm；With the furfural content in the standard oil sample of detection as abscissa,
With its maximum absorbance at 512-520nm as vertical coordinate, make standard curve, draw and at 512-520nm, read maximum extinction
Degree and the linear regression curves of furfural content: y=0.3163x+0.1697, r2=0.994, Fig. 3 are this linear regression curves figure.
3rd, the furfural content in measuring transformer oil sample
Weigh the oil sample to be measured (actual furfural content is 0.812mg/l) of 10ml, add in the absorbing light pond of 30ml, then plus
Enter 15ml developer and be full of absorbing light pond (attention reserves and adds a cover space), gently overturn absorbing light pond after adding a cover and (must not acutely shake
Swing volumetric flask, in order to avoid material is mixed in color product in oil, affect layered effect) 5-10 time (completing in 1 minute), by absorbing light
Pond is put in optical rack, starts timing, stands 4-6 minute, opens in time t (t when this time is with Criterion curve is consistent)
Actuating miniature spectrogrph carries out all band scanning, and with air reference, the time of integration is 8ms to spectrogrph, and average time is 10, smoothness
For 10.All absorption cell is cleaned with acetone after testing every time.Read maximum absorbance at 512-520nm, according to above being drawn
The standard curve obtaining, the furfural content being calculated in oil sample to be measured is 0.78mg/l, and error is only 3.94%.
Can be seen that furfural content the employing spectral technique direct measurement transformer oil that the application proposes from embodiment 1
Method, without extraction, can avoid the interference of complicated ingredient in transformer oil, easy and simple to handle, certainty of measurement is higher, reproducible.
It is particularly suitable for carrying out the quick measurement of furfural in transformer oil at the scene through simple training personnel.
Claims (10)
1. a kind of spectroscopic system is it is characterised in that include: the first optical lenses, absorption cell, the second optical lenses and optical rack；
Described first optical lenses and the second optical lenses are separately positioned on the both sides of described optical rack, described first optical lenses
Axis and the axis of described second optical lenses mutually coincide；
Described absorption cell is arranged in described optical rack, positioned between described first optical lenses and the second optical lenses.
2. spectroscopic system according to claim 1 is it is characterised in that between the base of described axis and described optical rack
Distance is less than or equal to 1/3rd of described absorption cell height.
3. spectroscopic system according to claim 1 is it is characterised in that described absorption cell includes body and lid；Described lid
Outer rim is provided with silica gel sealing pad；
Described absorption cell is quartz glass absorption cell.
4. spectroscopic system according to claim 1 is it is characterised in that described optical rack is to seal system.
5. the spectroscopic system according to Claims 1-4 any one is it is characterised in that also include: light source, input optical fibre,
Output optical fibre, micro spectrometer and computer；
Described light source connects described input optical fibre；
Described input optical fibre and output optical fibre connect described first lens and the second lens respectively；
Described micro spectrometer connects described output optical fibre and described computer respectively；
The wave-length coverage of described light source is 200-1100nm.
6. in a kind of direct measurement transformer oil furfural content method, comprising:
Prepare the standard oil sample of different furfural contents, mix homogeneously with developer respectively, standing, any using claim 1 to 5
Spectroscopic system described in one measures the absorbance of described standard oil sample, draws standard curve；
Oil sample to be measured is mixed homogeneously with developer, standing, using the spectral series unified test described in claim 1 to 5 any one
The absorbance of fixed described oil sample to be measured；
Furfural content in described oil sample to be measured is calculated according to described standard curve.
7. method according to claim 6 is it is characterised in that described developer includes glacial acetic acid and aniline；Described ice vinegar
The volume ratio of sour and described aniline is 9:1.
8. method according to claim 6 is it is characterised in that described absorbance is wave-length coverage between 512-520nm
Maximum absorbance.
9. method according to claim 1 is it is characterised in that the time of described standing is 4-6min.
10. method according to claim 1 is it is characterised in that the furfural content of described standard oil sample is 0.1-5mg/l.
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| CN1782696A (en) * | 2003-12-11 | 2006-06-07 | 中国科学院长春光学精密机械与物理研究所 | Lens type detector on micro biochemical chip |
| CN101887094A (en) * | 2010-06-30 | 2010-11-17 | 河南省电力公司济源供电公司 | Judging method of solid insulating and aging degrees of transformer |
| CN103149309A (en) * | 2011-12-06 | 2013-06-12 | 上海宝钢工业检测公司 | Measuring method for the furfural content of transformer oil |
| CN103398966A (en) * | 2013-08-20 | 2013-11-20 | 杭州北斗星膜制品有限公司 | Method for detecting TMC concentration in organic solution by using spectrometer |
| CN104007192A (en) * | 2014-05-08 | 2014-08-27 | 广东电网公司电力科学研究院 | Determination method for metal deactivator, furfural and anti-oxidant in insulating oil |
| CN104198388A (en) * | 2014-09-15 | 2014-12-10 | 中国科学院烟台海岸带研究所 | Online water quality monitoring device based on composite spectrum measurement |
| CN105954215A (en) * | 2016-05-03 | 2016-09-21 | 河南师范大学 | Method for measuring content of furfural by utilizing aniline hydrochloride salt solution |
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