CN110118746B - Method for detecting moisture content of insulating oil - Google Patents
Method for detecting moisture content of insulating oil Download PDFInfo
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- CN110118746B CN110118746B CN201910534315.7A CN201910534315A CN110118746B CN 110118746 B CN110118746 B CN 110118746B CN 201910534315 A CN201910534315 A CN 201910534315A CN 110118746 B CN110118746 B CN 110118746B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000003086 colorant Substances 0.000 claims abstract description 9
- 230000003287 optical effect Effects 0.000 claims description 8
- 238000003384 imaging method Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000009659 non-destructive testing Methods 0.000 abstract 1
- 230000005855 radiation Effects 0.000 description 10
- 238000012360 testing method Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 239000013043 chemical agent Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000005085 air analysis Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 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
- 239000011810 insulating material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000002834 transmittance Methods 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]
Abstract
The embodiment of the application provides a method for detecting the moisture content of insulating oil, which comprises the steps of arranging a two-dimensional moving platform between a terahertz laser and a terahertz detector, wherein an insulating oil sample is arranged on the two-dimensional moving platform; controlling a terahertz laser to emit terahertz waves to an insulating oil sample; controlling the movement of the insulating oil sample on a preset focal plane through a two-dimensional moving platform; calculating a transmission function of a plurality of sites according to terahertz data of the plurality of sites in the insulating oil sample received by a terahertz detector; respectively representing the transmission functions of a plurality of sites in the insulating oil sample by using preset colors to obtain a terahertz scanning image of the insulating oil sample; and matching the terahertz scanning image with an insulating oil terahertz image database to obtain the insulating oil moisture content of the insulating oil sample. The application detects the oil-water content of the insulating oil through the terahertz imaging technology, can realize nondestructive testing, and has the advantages of high accuracy, high automation degree, environmental friendliness and the like.
Description
Technical Field
The application relates to the technical field of transformers, in particular to a method for detecting moisture content of insulating oil.
Background
Insulating oil is filled in the oil immersed transformer, and the insulating oil can play insulating, heat dissipation and arc extinguishing roles. Monitoring the insulating oil is an important means for guaranteeing the normal operation of the transformer. Moisture is one of important indicators for monitoring the quality of insulating oil, and the moisture source of a transformer is mainly moisture in the atmosphere from the outside of equipment to enter oil, moisture adsorbed by cellulose of an insulating material permeates into oil, or moisture generated by aging and decomposition of cellulose enters into oil. When the transformer runs, only a trace amount of moisture exists in the insulating oil, and great harm is caused to the electrical property and the physical and chemical properties of the insulating medium. Moisture can cause the breakdown voltage of the insulating oil to be reduced, the dielectric loss factor to be increased and the aging of the insulating oil to be accelerated, and the more important influence is that the paper insulation is permanently damaged, so that the operation reliability and the service life of oil-filled electrical equipment are reduced, and even insulation accidents are caused. Therefore, it is important to periodically measure the moisture content of the operating insulating oil.
In the related art, the method for measuring the moisture in the insulating oil is a coulometric titration method, and in the measuring process, a chemical agent needs to be added into the insulating oil, so that the insulating oil for measurement is difficult to recycle, and waste is caused.
Disclosure of Invention
The application provides a method for detecting the moisture content of insulating oil, which aims to solve the problem that the insulating oil cannot be recycled after the moisture content is determined.
The application provides a method for detecting the moisture content of insulating oil, which comprises the following steps:
a two-dimensional moving platform is arranged between the terahertz laser and the terahertz detector, wherein an insulating oil sample is arranged on the two-dimensional moving platform;
controlling the terahertz laser to emit terahertz waves to the insulating oil sample;
controlling the insulating oil sample to move on a preset focal plane through a two-dimensional moving platform;
calculating a transmission function of a plurality of sites according to terahertz data of the sites in the insulating oil sample received by the terahertz detector;
respectively representing the transmission functions of a plurality of sites in the insulating oil sample by using preset colors to obtain a terahertz scanning image of the insulating oil sample;
and matching the terahertz scanning image with an insulating oil terahertz image database to obtain the insulating oil water content of the insulating oil sample, wherein the insulating oil terahertz image database comprises a plurality of terahertz images with preset insulating oil water content.
Optionally, the step of representing the transmission functions of all the sites by preset colors respectively to obtain the terahertz scanning image of the insulating oil sample includes:
establishing a terahertz scanning base map corresponding to the site of the insulating oil sample;
in the terahertz scanning base map, the same transmission functions are represented by the same color, and different transmission functions are represented by different colors, so that a terahertz scanning image of the insulating oil sample is obtained.
Optionally, set up two-dimensional moving platform between terahertz laser instrument and terahertz detector now, wherein, be provided with on the two-dimensional moving platform and be equipped with insulating oil sample, include:
adjusting the terahertz laser and the terahertz detector until the optical path focus of the terahertz laser and the optical path focus of the terahertz detector coincide;
and arranging a two-dimensional moving platform provided with an insulating oil sample between the terahertz laser and the terahertz detector, so that the focus of the light path is positioned on the insulating oil sample.
Optionally, controlling the terahertz laser to emit terahertz waves to the insulating oil sample includes: and controlling the terahertz laser to emit terahertz waves to vertically transmit the insulating oil sample.
Optionally, controlling the insulating oil sample to move on a preset focal plane through a two-dimensional moving platform, including: and controlling the two-dimensional moving platform to move through a stepping motor controller, so that the insulating oil sample on the two-dimensional moving platform moves on a preset focal plane.
The application provides an insulating oil moisture content detection method's beneficial effect includes:
the method can detect the moisture content in the insulating oil without adding chemical agents when testing the moisture in the oil, and is environment-friendly; the application provides an insulating oil moisture content testing method is to the sample measurement back, and the sample hardly changes, and the sample after the measurement can recycle, can reach nondestructive test. In addition, according to the method for detecting the water content of the insulating oil, the information of the water content in the insulating oil is displayed through the difference of the terahertz waves, and the precision is greatly improved through amplification treatment; the automatic control can be realized, the operation is simple and convenient, and the automation degree is high.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a schematic diagram of continuous terahertz scanning imaging provided by an embodiment of the present application;
fig. 2 is a schematic flow chart of a method for detecting moisture content in insulating oil according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of terahertz wave transmission provided in an embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terahertz signal has strong penetrating power, continuous scanning terahertz imaging can detect intensity information of electromagnetic waves after the electromagnetic waves penetrate through or are reflected by a sample, and the terahertz signal has the characteristics of high radiation power, simple system, low price, high imaging speed, convenience in use and the like. The polar molecules and the nonpolar molecules have great difference on the absorption of the terahertz radiation, when the polar substance is irradiated by the terahertz radiation, most of the terahertz radiation is absorbed, and the transmittance of the terahertz radiation is low; when the nonpolar substance is irradiated by the terahertz radiation, the terahertz radiation is hardly absorbed, and the transmission efficiency is high. Therefore, the amount of the polar substance in the sample can be judged according to the transmitted terahertz intensity when the sample is irradiated by terahertz. The insulating oil is a non-polar substance, the water is a polar substance, when the insulating oil contains different water contents, and the insulating oil is irradiated by terahertz radiation with the same intensity, the transmitted terahertz radiation is different, and the water content in the insulating oil can be judged by detecting the strength of the transmitted terahertz signal.
Referring to fig. 1, for a schematic diagram of continuous terahertz scanning imaging provided in the embodiment of the present application, as shown in fig. 1, a terahertz laser 1 may be a CO2 pumped terahertz laser source, a terahertz wave emitted by the terahertz laser 1 is collimated by a plurality of off-axis PMs (parabolic mirrors) and chopped by a chopper 3, and is focused on a sample 5 by a prism 4, a computer 7 controls a stepping motor controller 6 to operate, so that a two-dimensional moving platform on which the sample 5 is located is moved, thereby realizing continuous scanning of a plurality of sites of the sample 5, and the scanned terahertz wave is received by a terahertz detector 8, processed by a data processing unit 9, and transmitted to an upper computer 7 for imaging. Referring to fig. 2, a flow schematic diagram of the method for detecting moisture content in insulating oil provided in the embodiment of the present application is shown in fig. 2, and the method for detecting moisture content in insulating oil provided in the embodiment of the present application includes the following steps:
step S110: a two-dimensional moving platform is arranged between a terahertz laser and a terahertz detector, wherein an insulating oil sample is arranged on the two-dimensional moving platform.
Adjusting the terahertz laser 1 and the terahertz detector 8 until the optical path focus of the terahertz laser 1 and the optical path focus of the terahertz detector 8 coincide; and arranging a two-dimensional moving platform provided with an insulating oil sample between the terahertz laser 1 and the terahertz detector 8, so that the focus of the light path is positioned on the insulating oil sample. Wherein, the insulating oil sample is the sample 5, and the optical path focus points to the terahertz wave focus point of the sample 5, i.e. the point P in fig. 1.
Insulating oil sample still can hold in the sample bottle, and the sample bottle is fixed to be set up at the sample bench, and the sample bench is connected with two-dimensional moving platform, when two-dimensional moving platform removed, can drive the sample bench and remove. Because the sample bottle has certain thickness, in this application embodiment, the light path focus is located the incident plane of sample bottle, can reflect the light path change behind terahertz transmission sample 5.
Step S120: and controlling the terahertz laser to emit terahertz waves to the insulating oil sample.
The terahertz laser 1 can be connected with the computer 7, and terahertz continuous scanning imaging is automatically started.
Off-axis parabolic mirror 2 comprises PM1、PM2And PM3The terahertz waves emitted by the terahertz laser 1 pass through PM in sequence1Collimation, chopper 3 chopping, PM2Collimation, PM3Collimation and prism 4 focusingAfter the focus, it is transmitted to the sample 5.
Step S130: and controlling the insulating oil sample to move on a preset focal plane through a two-dimensional moving platform.
And sending a control command to the stepping motor controller 6 through the computer 7, so that the stepping motor controller 6 controls the two-dimensional moving platform to move, and the sample 5 on the two-dimensional moving platform moves on a preset focal plane. In the embodiment of the present application, a focal plane is a plane where a focal point P of the optical path is located, and the focal plane is perpendicular to incident terahertz waves.
Step S140: and calculating the transmission function of the sites according to the terahertz data of the multiple sites in the insulating oil sample received by the terahertz detector.
Referring to fig. 3, which is a schematic diagram of terahertz wave transmission provided in the embodiment of the present application, in fig. 3, the left side of the sample is an incident terahertz wave, and the right side of the sample is a transmission terahertz wave. For incident terahertz wave EairAnalysis of (ω) and the transmitted terahertz wave E (ω) was as follows:
according to the principle of the fresnel, when the terahertz interacts with the sample, the transmission coefficient t of the amplitude change of the surface can be obtained by the formula (1):
(1) in the formula, n1Is the refractive index of air, n2Is the refractive index of the sample; thetaiIs the angle of incidence, θtIs the angle of refraction. When terahertz vertically irradiates a sample, θi＝θtThe transmission coefficient is simplified to 0:
when terahertz penetrates through a sample with the thickness d, the phase of the terahertz changes, and the phase change is determined by a transmission factor:
without a sample, terahertz is transmitted in air:
Eair＝E0(ω)Pair(ω,z) (4)
when terahertz passes through a sample with thickness d:
E(ω)＝E0(ω)Pair(ω,(z，d)t01Psanple(ω,d)t10) (5)
(5) in the formula, E0Electric field power t when the terahertz wave reaches the surface of the sample01Is the transmission coefficient of air to the sample, t10Is the transmission coefficient of the sample to air, PsanpleIs the phase change amount of the terahertz transmitted by the sample. Thus, the transfer function of terahertz transmission imaging can be:
the sample is placed on a sample stage, and the sample stage is moved so that the terahertz waves are vertically transmitted at all the sites of the sample 5, each of which will generate a transfer function shown in (6).
Step S150: and respectively representing the transmission functions of a plurality of sites in the insulating oil sample by using preset colors to obtain a terahertz scanning image of the insulating oil sample.
Firstly, establishing a terahertz scanning base map corresponding to a site of an insulating oil sample; then, in the terahertz scanning base map, the same transmission functions are represented by the same color, and different transmission functions are represented by different colors; and finally, obtaining a terahertz scanning image of the insulating oil sample.
In the embodiment of the application, the power of terahertz radiation reaches a certain intensity, and the higher the power is, the more obvious the discrimination of images is, so that a high-power terahertz emission source is selected when terahertz power is selected.
Step S160: and matching the terahertz scanning image with an insulating oil terahertz image database to obtain the insulating oil water content of the insulating oil sample, wherein the insulating oil terahertz image database comprises a plurality of terahertz images with preset insulating oil water content.
Before the steps S110-S150 are implemented, an insulating oil terahertz image database can be established in advance, and the insulating oil terahertz image database comprises a plurality of terahertz images with preset insulating oil water content, so that when the water content of the transformer insulating oil needs to be detected, a part of the transformer insulating oil is taken as a sample 5, after the steps S110-S150 are executed, a terahertz scanning image of the current transformer insulating oil sample is obtained, and then the terahertz scanning image is matched with the insulating oil terahertz image database, so that the insulating oil water content of the insulating oil sample can be obtained. Because this application embodiment uses terahertz wave to carry out transmission detection to insulating oil sample, insulating oil seals in the sample bottle always among the testing process, and is less to insulating oil's change, can reach nondestructive test, and the back that finishes detecting can carry insulating oil back to the transformer in, the energy saving is comparatively friendly to the environment.
The embodiment shows that the moisture content in the insulating oil can be detected without adding chemical agents when the moisture in the oil is detected, and the method is environment-friendly; the application provides an insulating oil moisture content testing method is to the sample measurement back, and the sample hardly changes, and the sample after the measurement can recycle, can reach nondestructive test. In addition, according to the method for detecting the water content of the insulating oil, the information of the water content in the insulating oil is displayed through the difference of the terahertz waves, and the precision is greatly improved through amplification treatment; the automatic control can be realized, the operation is simple and convenient, and the automation degree is high.
Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.
It should be noted that, in the present specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article or device comprising the element.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (5)
1. The method for detecting the moisture content of the insulating oil is characterized by comprising the following steps
A two-dimensional moving platform is arranged between the terahertz laser and the terahertz detector, wherein an insulating oil sample is arranged on the two-dimensional moving platform;
controlling the terahertz laser to emit terahertz waves to the insulating oil sample;
controlling the insulating oil sample to move on a preset focal plane through a two-dimensional moving platform;
calculating a transmission function of a plurality of sites according to terahertz data of the sites in the insulating oil sample received by the terahertz detector;
respectively representing the transmission functions of a plurality of sites in the insulating oil sample by using preset colors to obtain a terahertz scanning image of the insulating oil sample;
and matching the terahertz scanning image with an insulating oil terahertz image database to obtain the insulating oil water content of the insulating oil sample, wherein the insulating oil terahertz image database comprises a plurality of terahertz images with preset insulating oil water content.
2. The method for detecting the moisture content of the insulating oil according to claim 1, wherein the step of representing the transmission functions of all the sites by preset colors respectively to obtain the terahertz scanning image of the insulating oil sample comprises the following steps:
establishing a terahertz scanning base map corresponding to the site of the insulating oil sample;
in the terahertz scanning base map, the same transmission functions are represented by the same color, and different transmission functions are represented by different colors, so that a terahertz scanning image of the insulating oil sample is obtained.
3. The method for detecting the moisture content of the insulating oil according to claim 1, wherein a two-dimensional moving platform is arranged between the terahertz laser and the terahertz detector, wherein the two-dimensional moving platform is provided with the insulating oil sample, and the method comprises the following steps:
adjusting the terahertz laser and the terahertz detector until the optical path focus of the terahertz laser and the optical path focus of the terahertz detector coincide;
and arranging a two-dimensional moving platform provided with an insulating oil sample between the terahertz laser and the terahertz detector, so that the focus of the light path is positioned on the insulating oil sample.
4. The method for detecting the moisture content of the insulating oil according to claim 1, wherein controlling the terahertz laser to emit the terahertz wave to the insulating oil sample comprises: and controlling the terahertz waves emitted by the terahertz laser to vertically transmit the insulating oil sample.
5. The method for detecting the moisture content of the insulating oil according to claim 1, wherein the step of controlling the insulating oil sample to move on a preset focal plane by a two-dimensional moving platform comprises the following steps: and controlling the two-dimensional moving platform to move through a stepping motor controller, so that the insulating oil sample on the two-dimensional moving platform moves on a preset focal plane.
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