CN110118746A - Insulating oil moisture content detection method - Google Patents
Insulating oil moisture content detection method Download PDFInfo
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- CN110118746A CN110118746A CN201910534315.7A CN201910534315A CN110118746A CN 110118746 A CN110118746 A CN 110118746A CN 201910534315 A CN201910534315 A CN 201910534315A CN 110118746 A CN110118746 A CN 110118746A
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- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 238000009413 insulation Methods 0.000 claims abstract description 60
- 238000012546 transfer Methods 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims description 19
- 230000003287 optical effect Effects 0.000 claims description 13
- 208000033748 Device issues Diseases 0.000 claims description 3
- 239000003086 colorant Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 8
- 238000003384 imaging method Methods 0.000 abstract description 5
- 238000009659 non-destructive testing Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 239000013043 chemical agent Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005443 coulometric titration Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- G01N21/17—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
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
- G01N21/3586—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]
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- Life Sciences & Earth Sciences (AREA)
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The embodiment of the present application provides a kind of insulating oil moisture content detection method, and this method, which is included between thz laser device and terahertz detector, is arranged two-dimensional movement platform, is provided in two-dimensional movement platform equipped with insulation oil samples；It controls thz laser device and issues THz wave to insulation oil samples；Insulation oil samples are controlled by two-dimensional movement platform to move on preset focal plane；The Terahertz data in multiple sites, calculate the transfer function in site in the insulation oil samples received according to terahertz detector；The transfer function in multiple sites in the oil samples that insulate is indicated with preset color respectively, obtains the Terahertz scan image of insulation oil samples；Terahertz scan image is matched with insulating oil terahertz image database, obtains the insulating oil moisture content of insulation oil samples.The application detects insulating oil moisture content by THz imaging technology, can be realized non-destructive testing, has many advantages, such as accuracy height, high degree of automation, environmentally friendly.
Description
Technical field
This application involves transformer technology field more particularly to a kind of insulating oil moisture content detection methods.
Background technique
Insulating oil is filled in oil-immersed transformer, insulating oil can play the role of insulation, heat dissipation and arc extinguishing.To insulation
Oil is monitored, and is the important means for ensureing the normal operation of transformer.Moisture be insulating oil quality-monitoring important indicator it
One, the moisture source of transformer is mainly moisture in atmosphere from being invaded in oil outside equipment and the cellulose of insulating materials is inhaled
Attached moisture penetrates into the moisture that in oil or cellulose degradation and decomposition generates and enters in oil.In Transformer, insulating oil only
Have micro moisture, will electrical property to dielectric and physicochemical property cause very big harm.Moisture can lead to insulation
Oil breakdown voltage reduces, medium consumption factor increases and insulation oil degradation accelerates, and more main influence is to make paper insulation by forever
The destruction of long property, so as to cause the operational reliability and service life reduction of oil-filled electric equipment, or even causes insulation fault.Therefore,
Periodically determination of moisture is carried out to the insulating oil of operation to have great importance.
In the related technology, the method used to determination of moisture in insulating oil is coulometric titration, and this method is in continuous mode
Middle needs add chemical agent in insulating oil, and the insulating oil for measurement is difficult to be recycled, and causes to waste.
Summary of the invention
This application provides a kind of insulating oil moisture content detection method, to solve insulating oil after determination of moisture not
The problem of capable of recycling.
This application provides a kind of insulating oil moisture content detection methods, this method comprises:
Two-dimensional movement platform is set between thz laser device and terahertz detector, wherein the two-dimensional movement is flat
It is provided on platform equipped with insulation oil samples；
It controls the thz laser device and issues THz wave to the insulation oil samples；
The insulation oil samples are controlled by two-dimensional movement platform to move on preset focal plane；
The Terahertz data in multiple sites in the insulation oil samples received according to the terahertz detector calculate
The transfer function in the site；
The transfer function in multiple sites in the insulation oil samples is indicated with preset color respectively, obtains the insulation
The Terahertz scan image of oil samples；
The Terahertz scan image is matched with insulating oil terahertz image database, obtains the insulation oil sample
The insulating oil moisture content of product, wherein the insulating oil terahertz image database includes a variety of default insulating oil moisture contents
Terahertz image.
Optionally, the transfer function in all sites is indicated with preset color respectively, obtains the insulation oil sample
The Terahertz scan image of product, comprising:
It establishes Terahertz corresponding with the insulation site of oil samples and scans base map；
In Terahertz scanning base map, identical transfer function is indicated with identical color, by different transmission
Function is indicated with different colors, obtains the Terahertz scan image of the insulation oil samples.
Optionally, two-dimensional movement platform is set between thz laser device and terahertz detector, wherein two-dimensional movement
It is provided on platform equipped with insulation oil samples, comprising:
The thz laser device and terahertz detector are adjusted, until the optical path focus and too of the thz laser device
The optical path focus of hertz detector is overlapped；
The two-dimensional movement platform for being provided with insulation oil samples is set to the thz laser device and terahertz detector
Between, it is located at the optical path focus in the insulation oil samples.
Optionally, it controls the thz laser device and issues THz wave to the insulation oil samples, comprising: described in control
Thz laser device issues the oil samples that insulate described in THz wave normal transmission.
Optionally, the insulation oil samples are controlled by two-dimensional movement platform to move on preset focal plane, comprising:
The two-dimensional movement platform movement is controlled by controllor for step-by-step motor, makes the insulation oil sample in the two-dimensional movement platform
Product move on preset focal plane.
The beneficial effect of insulating oil moisture content detection method provided by the present application includes:
The application, which does not need addition chemical agent when testing water content in oil, can detect moisture content in insulating oil, right
It is environmental-friendly；After insulating oil moisture content detection method provided by the present application measures sample, sample hardly changes,
Sample after measurement can recycle, and can reach non-destructive testing.In addition, insulating oil moisture content detection provided by the present application
Method comes out the information of water content in insulating oil by the differential disply of THz wave, and by enhanced processing, precision will be big
It is big to improve；The application can realize automation control, easy to operate, high degree of automation.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without any creative labor,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of insulating oil moisture content detection method provided by the embodiments of the present application；
Fig. 2 is a kind of THz wave transmission imaging schematic diagram provided by the embodiments of the present application.
Specific embodiment
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described implementation
Example is only some embodiments of the present application, rather than whole embodiments.Based on the embodiment in the application, the common skill in this field
The application protection all should belong in art personnel every other embodiment obtained without making creative work
Range.
Terahertz signal has a very strong penetration power, continuous scanning terahertz imaging be able to detect electromagnetic wave through sample or
Strength information after sample reflects, radiant power with higher, system is simple, price is low, image taking speed is fast, easy to use
The features such as.Polar molecule and nonpolar molecule have larger difference to the absorption of terahertz emission, and terahertz emission irradiates polar object
When matter, terahertz emission is largely absorbed, and terahertz emission transmissivity is lower；When terahertz emission irradiates apolar substance,
Terahertz emission is hardly absorbed, and efficiency of transmission is higher.It therefore can be according to the terahertz of transmission in Terahertz irradiating sample
Hereby intensity determines the quantity of polar substances in sample.Insulating oil is apolar substance, and water is polar substances, when insulation Water in oil
When measuring different, when being irradiated with the terahertz emission of intensity of the same race, the terahertz emission of transmission will be different, pass through detection transmission
The power of terahertz signal it may determine that insulation water content in oil content.
It is a kind of schematic diagram of continuous Terahertz scanning imagery provided by the embodiments of the present application referring to Fig. 1, as shown in Figure 1,
The THz wave that thz laser device 1 can issue for the THz laser source of CO2 pumping, thz laser device 1, through multiple off-axis
After PM (parabolic mirror, paraboloidal mirror) collimation and 3 copped wave of chopper, focused on sample 5 through prism 4, computer 7
It controls controllor for step-by-step motor 6 to work, the two-dimensional movement platform where making sample 5 is mobile, to realize to a site of sample more than 5
Continuous scanning, the THz wave after scanning receives through terahertz detector 8, transmits after data processing unit 9 is handled
It is imaged to host computer 7.The specific implementation process of above-mentioned technical proposal is one kind provided by the embodiments of the present application referring to fig. 2
The flow diagram of insulating oil moisture content detection method, as shown in Fig. 2, insulating oil moisture content provided by the embodiments of the present application
Detection method, comprising the following steps:
Step S110: two-dimensional movement platform is set between thz laser device and terahertz detector, wherein two dimension is moved
It is provided on moving platform equipped with insulation oil samples.
Thz laser device 1 and terahertz detector 8 are adjusted, until the optical path focus and Terahertz of thz laser device 1
The optical path focus of detector 8 is overlapped；The two-dimensional movement platform for being provided with insulation oil samples is set to thz laser device 1 and too
Between hertz detector 8, it is located at the optical path focus in insulation oil samples.Wherein, insulate oil samples, that is, sample 5, and optical path is burnt
Point refers to the THz wave focus of directive or injection sample 5, i.e. P point in Fig. 1.
Insulation oil samples can be also contained in sample bottle, and sample bottle is fixed on sample stage, and sample stage and two dimension are moved
It is mobile to be able to drive sample stage when two-dimensional movement platform is mobile for moving platform connection.Since sample bottle has certain thickness, this Shen
Please be in embodiment, optical path focus is located at the plane of incidence of sample bottle, the optical path change after can reflect Terahertz transmission sample 5.
Step S120: control thz laser device issues THz wave to insulation oil samples.
Thz laser device 1 can be connect with computer 7, realize automation starting Terahertz continuous scanning imaging.
Off axis paraboloidal mirror 2 includes PM1、PM2And PM3, the THz wave that thz laser device 1 issues is successively through PM1It is quasi-
Directly, 3 copped wave of chopper, PM2Collimation, PM3After collimation and prism 4 focus, it is transmitted to sample 5.
Step S130: insulation oil samples are controlled by two-dimensional movement platform and are moved on preset focal plane.
Control command is sent to controllor for step-by-step motor 6 by computer 7, controllor for step-by-step motor 6 is made to control two-dimentional shifting
Moving platform movement, moves the sample 5 in two-dimensional movement platform on preset focal plane.In the embodiment of the present application, focus
Plane where plane, that is, optical path focus P, focal plane is perpendicular to incident THz wave.
Step S140: the Terahertz data in multiple sites in the insulation oil samples received according to terahertz detector, meter
Calculate the transfer function in site.
Referring to Fig. 3, transmit schematic diagram for a kind of THz wave provided by the embodiments of the present application, in Fig. 3, the sample left side be into
THz wave is penetrated, is transmission THz wave on the right of sample.To incident THz wave Eair(ω) and transmission THz wave E (ω)
It is analyzed as follows:
By Fresnel law according to Fresnel principle, the transmission of amplitude variations is represented after Terahertz and sample interaction
Coefficient t can be obtained by formula (1):
(1) in formula, n1For the refractive index of air, n2For the refractive index of sample；θiFor incidence angle, θtFor refraction angle.Work as terahertz
Hereby when vertical irradiation sample, θi=θt=0, transmission coefficient simplifies are as follows:
When Terahertz penetrates the sample with a thickness of d, phase changes, and phase change is determined by transmission factor:
When not having sample, Terahertz transmits in air:
Eair=E0(ω)Pair(ω,z) (4)
When Terahertz is by sample with a thickness of d:
E (ω)=E0(ω)Pair(ω, (z, d) t01Psanple(ω,d)t10) (5)
(5) in formula, E0Electric field power when sample surfaces, t are reached for THz wave01It is transmission system of the air to sample
Number, t10For the transmission coefficient of sample to air, PsanpleIt is Terahertz through the phase changing capacity after sample.Therefore, Terahertz is saturating
The transfer function for penetrating imaging can are as follows:
Sample is placed on a sample stage, mobile example platform, so that THz wave normal transmission is in all positions of sample 5
Point, each site will generate transfer function shown in one (6).
Step S150: the transfer function in multiple sites in the oil samples that insulate is indicated with preset color respectively, is obtained absolutely
The Terahertz scan image of edge oil samples.
Firstly, establishing Terahertz corresponding with the insulation site of oil samples scans base map；Then, base map is scanned in Terahertz
In, identical transfer function is indicated with identical color, different transfer functions is indicated with different colors；Finally,
To the Terahertz scan image of the insulation oil samples.
In the embodiment of the present application, the power of terahertz emission will reach certain intensity, and power is higher, the discrimination of image
It is more obvious, therefore selects powerful terahertz sources source when Terahertz power selection.
Step S160: Terahertz scan image is matched with insulating oil terahertz image database, obtains insulating oil
The insulating oil moisture content of sample, wherein insulating oil terahertz image database includes a variety of default insulating oil moisture contents
Terahertz image.
Before implementation steps S110-S150, insulating oil terahertz image database, insulating oil Terahertz can be pre-established
Image data base includes the terahertz image of a variety of default insulating oil moisture contents, in this way, when need to transformer insulation oil into
When row moisture content detects, a part is taken to obtain after executing step S110-S150 from transformer insulation oil as sample 5
The Terahertz scan image of current transformer insulated oil samples, then itself and insulating oil terahertz image database are carried out
Match, the insulating oil moisture content of insulation oil samples can be obtained.Since the embodiment of the present application uses THz wave to insulation oil sample
Product carry out transmission detection, and insulating oil is sealed in sample bottle always in detection process, smaller to the change of insulating oil, can achieve
Insulating oil after detection, can be transmitted back in transformer by non-destructive testing, energy saving, more friendly to environment.
As seen from the above-described embodiment, the application, which does not need addition chemical agent when testing water content in oil, can detect absolutely
Edge water content in oil content, it is environmentally friendly；After insulating oil moisture content detection method provided by the present application measures sample, sample
It hardly changes, the sample after measurement can recycle, and can reach non-destructive testing.In addition, provided by the present application
Insulating oil moisture content detection method comes out the information of water content in insulating oil by the differential disply of THz wave, passes through
Enhanced processing, precision will greatly improve；The application can realize automation control, easy to operate, high degree of automation.
Since embodiment of above is that reference combination is illustrated on other modes, have between different embodiments
There is identical part, identical, similar part may refer to each other between each embodiment in this specification.Herein no longer in detail
It illustrates.
It should be noted that in the present specification, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the circuit structure, article or the equipment that include a series of elements not only include those elements,
It but also including other elements that are not explicitly listed, or further include solid by this circuit structure, article or equipment
Some elements.In the absence of more restrictions, the element for thering is sentence "including a ..." to limit, it is not excluded that including
There is also other identical elements in the circuit structure of the element, article or equipment.
Those skilled in the art will readily occur to its of the application after considering specification and practicing the disclosure invented here
His embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows the general principle of the application and including the undocumented common knowledge in the art of the application
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the application are wanted by right
The content asked is pointed out.
Above-described the application embodiment does not constitute the restriction to the application protection scope.
Claims (5)
1. a kind of insulating oil moisture content detection method, which is characterized in that including
Two-dimensional movement platform is set between thz laser device and terahertz detector, wherein in the two-dimensional movement platform
It is provided with equipped with insulation oil samples；
It controls the thz laser device and issues THz wave to the insulation oil samples；
The insulation oil samples are controlled by two-dimensional movement platform to move on preset focal plane；
The Terahertz data in multiple sites in the insulation oil samples received according to the terahertz detector, described in calculating
The transfer function in site；
The transfer function in multiple sites in the insulation oil samples is indicated with preset color respectively, obtains the insulation oil sample
The Terahertz scan image of product；
The Terahertz scan image is matched with insulating oil terahertz image database, obtains the insulation oil samples
Insulating oil moisture content, wherein the insulating oil terahertz image database include a variety of default insulating oil moisture contents too
Hertz image.
2. insulating oil moisture content detection method as described in claim 1, which is characterized in that by the transmission in all sites
Function is indicated with preset color respectively, obtains the Terahertz scan image of the insulation oil samples, comprising:
It establishes Terahertz corresponding with the insulation site of oil samples and scans base map；
In Terahertz scanning base map, identical transfer function is indicated with identical color, by different transfer functions
It is indicated with different colors, obtains the Terahertz scan image of the insulation oil samples.
3. insulating oil moisture content detection method as described in claim 1, which is characterized in that in thz laser device and terahertz
Two-dimensional movement platform hereby is set between detector, wherein insulation oil samples are provided in two-dimensional movement platform, comprising:
The thz laser device and terahertz detector are adjusted, until the optical path focus and Terahertz of the thz laser device
The optical path focus of detector is overlapped；
The two-dimensional movement platform for being provided with insulation oil samples is set between the thz laser device and terahertz detector,
It is located at the optical path focus in the insulation oil samples.
4. insulating oil moisture content detection method as described in claim 1, which is characterized in that control the thz laser device
THz wave is issued to the insulation oil samples, comprising: control the THz wave normal transmission that the thz laser device issues
The insulation oil samples.
5. insulating oil moisture content detection method as described in claim 1, which is characterized in that controlled by two-dimensional movement platform
The insulation oil samples move on preset focal plane, comprising: control the two-dimensional movement by controllor for step-by-step motor
Platform movement, moves the insulation oil samples in the two-dimensional movement platform on preset focal plane.
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| CN201910534315.7A CN110118746B (en) | 2019-06-20 | 2019-06-20 | Method for detecting moisture content of insulating oil |
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| CN201910534315.7A CN110118746B (en) | 2019-06-20 | 2019-06-20 | Method for detecting moisture content of insulating oil |
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| CN110118746B CN110118746B (en) | 2022-01-25 |
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Cited By (1)
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