CN110132864A - Gas in Oil of Transformer detection method - Google Patents
Gas in Oil of Transformer detection method Download PDFInfo
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- CN110132864A CN110132864A CN201810106719.1A CN201810106719A CN110132864A CN 110132864 A CN110132864 A CN 110132864A CN 201810106719 A CN201810106719 A CN 201810106719A CN 110132864 A CN110132864 A CN 110132864A
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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
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Abstract
The invention discloses a kind of Gas in Oil of Transformer detection methods, it is desirable to provide it is a kind of can be with reliably analyzing the Gas in Oil of Transformer detection method of the ingredient and content of the failure gas dissolved in transformer oil.It includes laser light source, gas chamber, photodetector and signal processing circuit module.Gas chamber is for storing the gas generated in transformer oil；Laser light source is connect by optical fiber with gas chamber；Gas chamber is connect by optical fiber with photodetector；Photodetector is connect with signal processing circuit module.Successively the following steps are included: first, laser light source is transmitted in air inlet chamber Gas in Oil of Transformer detection method by optical fiber, and the probe gas carried out in gas chamber absorbs, and light intensity decays；Second, the light after carrying out gas chamber absorption is delivered to photodetector by optical fiber, carries out photoelectric conversion by photodetector；Third, the signal input signal processing circuit module after photoelectric conversion carry out signal processing, and analysis obtains the indoor gas componant of gas and concentration.
Description
Technical field
The present invention relates to a kind of gas detecting systems, and in particular to a kind of Gas in Oil of Transformer detection method.
Background technique
Electric system by it is numerous send out, give, it is defeated, match, the equipment such as electricity consumption are formed by connecting, the reliability and operation conditions of equipment are straight
The stabilization and safety for determining whole system are connect, power supply quality and power supply reliability are also determined.With electric system to high voltage,
Large capacity, internet development and the raising of electricity consumption goal propose requirements at the higher level to the security reliability of electric system.
Transformer equipment is the main body of electric system, is the basis for guaranteeing power supply reliability.One capital equipment is asked
Topic, often results in part and global system equipment is out of service, cause the generation of power failure accident, therefore, transformer equipment
Safe and reliable operation it is particularly important.Maintenance is to guarantee the necessary means of transformer equipment health operation, is related to the benefit of equipment
The problems such as the overall efficiency with rate, accident rate, service life, the consumption of person property's power and electric power enterprise.
Currently, carrying out maintenance to transformer equipment is broadly divided into three levels: subsequent maintenance, preventative maintenance and state are examined
Repair, wherein repair based on condition of component has become the trend of overhaul of the equipments development, it require to the various states of running electrical equipment into
The lasting on-line monitoring of row, and the data information for reflecting various states is obtained at any time, after carrying out Data Analysis Services, to equipment
Various situations make diagnosis, and work out Strategies of Maintenance.
Domestic and international high voltage, large capacity transformer equipment generally use oil-filled transformer, it is under normal circumstances, oil-filled
Paper oil insulation material in electrical equipment is under the action of hot and electricity, meeting gradually aging and decomposition, to generate on a small quantity various
The gases such as low molecular hydrocarbon and CO2, CO, different failures and abnormality can generate different gas.
Inventor has found that the gas generated under transformer fault and abnormality can be dissolved in oil, therefore in transformer oil
The concentration of dissolved gas can preferably reflect the state of insulation and failure of transformer；But Gases Dissolved in Transformer Oil at present
Monitoring be a difficulties again, reason is: 1. failure gas are micro, usually several to dozens of μ L/L；2. failure
Relatively, there is biggish cross influences for several gas properties in gas；So using suitable detection method be
The key point of line monitoring technology.
The monitoring method of commercialization both at home and abroad mainly has gas chromatography (oil chromatography) and photocaustic spectroscopy at present.Gas phase color
Spectrometry: it detects testing principle are as follows: the sample in chromatographic column is different to the speed of absorption, the parsing of gas with various component, is carrying
Under the promotion of gas, by adequately exchanging, different component is separated, and the gas after separation is converted into telecommunications by detection
Number, the chromatogram of gas component is obtained after acquired, and concentration quantitative analysis is carried out according to component peak height or area.Gas chromatography
Rise in front of a century, although technology maturation, disadvantage clearly, mainly has: price is not capable of measuring hydrogen H2,
Maintenance is big, and tolerance required for detecting is more, and for element to oil vapour, humidity sensitive, adaptive capacity to environment is poor.
Photocaustic spectroscopy: optoacoustic spectroscopy detection technique is based on optoacoustic effect, and optoacoustic effect is by gas molecules sorb electromagnetism
It radiates and generates, temperature increases after the spectral line of gas absorption specific wavelength, and the de excitation in a manner of discharging thermal energy, releases immediately
Thermal energy is that gas generates proportional pressure wave.The frequency of pressure wave is consistent with the wave chopping frequency of light source, and can be by highly sensitive
Degree microphone monitors its intensity, the intensity of pressure wave and the proportional relationship of the concentration of gas.It is detected by sensitive original part, it is available
Reflect the optoacoustic spectroscopy of substance internal structure and component content.The shortcomings that photocaustic spectroscopy, is to diatomic molecule without response
(H2), lower to symmetrical configuration molecule (such as C2H2) detection accuracy, the optical filter of high transmittance is difficult to prepare and steam to oil
Contaminated vapor is sensitive, adaptability difference etc..
Summary of the invention
The purpose of the invention is to provide it is a kind of can with reliably analyze the failure gas dissolved in transformer oil at
Divide the Gas in Oil of Transformer detection method with content.
The technical scheme is that
A kind of Gas in Oil of Transformer detection method, including laser light source, gas chamber, photodetector and signal processing circuit module,
Signal processing circuit module includes locking phase amplification detection circuit module and photoelectric conversion and signal conditioning circuit module, in which: gas
Room is for storing the gas generated in transformer oil；Laser light source is connect by optical fiber with gas chamber；Gas chamber is examined by optical fiber and light
Survey device connection；Photodetector is connect with signal processing circuit module；Signal processing circuit module is detected for trace gas concentration；
Gas in Oil of Transformer detection method successively the following steps are included:
First, laser light source is transmitted in air inlet chamber by optical fiber, and the probe gas carried out in gas chamber absorbs, and light intensity decays；
Second, the light after carrying out gas chamber absorption is delivered to photodetector by optical fiber, carries out photoelectric conversion by photodetector；
Third, the signal input signal processing circuit module after photoelectric conversion carry out signal processing, and analysis obtains the indoor gas of gas
Body ingredient and concentration.
Preferably, in third step: the signal input signal processing circuit module after photoelectric conversion carries out model processing,
Specific step is as follows for the indoor gas componant of analysis acquisition gas and concentration:
After signal input signal processing circuit module after electricity conversion, pass through the band logical of photoelectric conversion and signal conditioning circuit module
After filtering and programming amplifying, locking phase amplification is carried out by locking phase amplification detection circuit module, realizes the detection of signal；
Photoelectric conversion and the Vlog voltage signal of signal conditioning circuit output are the noises filtered out outside passband by bandpass filter
The voltage signal of signal；Relationship between PIN tube current Ipd and Vlog output end voltage may be expressed as:
Vlog=Vy × lg (Ipd/IZ), in formula: IZ is logarithm intercept, and Vy is log slope.
Preferably, laser light source is DFB laser light source.
Preferably, photodetector is PIN pipe.
Preferably, gas chamber is transmission-type gas chamber or reflective gas chamber.
The beneficial effects of the present invention are: can be with reliably analyzing the ingredient of the failure gas dissolved in transformer oil and containing
Amount, prejudges transformer initial failure, to carry out on-call maintenance to transformer, extends the service life of transformer and pre-
The generation of anti-catastrophic failure.
Specific embodiment
Below by specific embodiment, present invention is further described in detail:
A kind of Gas in Oil of Transformer detection method, including laser light source, gas chamber, photodetector and signal processing circuit module.
Signal processing circuit module includes locking phase amplification detection circuit module and photoelectric conversion and signal conditioning circuit module.
Gas chamber is for storing the gas generated in transformer oil.The gas chamber of the present embodiment is transmission-type gas chamber or reflective gas
Room.
Laser light source is DFB laser light source.Laser light source is connect by optical fiber with gas chamber.
Photodetector is PIN pipe.Gas chamber is connect by optical fiber with photodetector.Photodetector and signal processing circuit module
Connection.
Signal processing circuit module is detected for trace gas concentration.
Gas in Oil of Transformer detection method successively the following steps are included:
First, laser light source is transmitted in air inlet chamber by optical fiber, and the probe gas carried out in gas chamber absorbs, and light intensity decays；
Second, the light after carrying out gas chamber absorption is delivered to photodetector by optical fiber, carries out photoelectric conversion by photodetector；
Third, the signal input signal processing circuit module after photoelectric conversion carry out signal processing, and analysis obtains the indoor gas of gas
Body ingredient and concentration.
In third step: the signal input signal processing circuit module after photoelectric conversion carries out model processing, and analysis obtains
Specific step is as follows for the indoor gas componant of gas and concentration:
After signal input signal processing circuit module after electricity conversion, pass through the band logical of photoelectric conversion and signal conditioning circuit module
After filtering and programming amplifying, locking phase amplification is carried out by locking phase amplification detection circuit module, realizes the detection of signal；
Photoelectric conversion and the Vlog voltage signal of signal conditioning circuit output are the noises filtered out outside passband by bandpass filter
The voltage signal of signal；Relationship between PIN tube current Ipd and Vlog output end voltage may be expressed as:
Vlog=Vy × lg (Ipd/IZ), in formula: IZ is logarithm intercept, and Vy is log slope.
Claims (5)
1. a kind of Gas in Oil of Transformer detection method, characterized in that at laser light source, gas chamber, photodetector and signal
Circuit module is managed, signal processing circuit module includes locking phase amplification detection circuit module and photoelectric conversion and signal conditioning circuit mould
Block, in which: gas chamber is for storing the gas generated in transformer oil；Laser light source is connect by optical fiber with gas chamber；Gas chamber passes through
Optical fiber is connect with photodetector；Photodetector is connect with signal processing circuit module；Signal processing circuit module is used for trace gas
Bulk concentration detection；
Gas in Oil of Transformer detection method successively the following steps are included:
First, laser light source is transmitted in air inlet chamber by optical fiber, and the probe gas carried out in gas chamber absorbs, and light intensity decays；
Second, the light after carrying out gas chamber absorption is delivered to photodetector by optical fiber, carries out photoelectric conversion by photodetector；
Third, the signal input signal processing circuit module after photoelectric conversion carry out signal processing, and analysis obtains the indoor gas of gas
Body ingredient and concentration.
2. Gas in Oil of Transformer detection method according to claim 1, characterized in that in the third step: photoelectricity
Signal input signal processing circuit module progress model processing after conversion, the indoor gas componant of analysis acquisition gas and concentration
Specific step is as follows:
After signal input signal processing circuit module after electricity conversion, pass through the band logical of photoelectric conversion and signal conditioning circuit module
After filtering and programming amplifying, locking phase amplification is carried out by locking phase amplification detection circuit module, realizes the detection of signal；
Photoelectric conversion and the Vlog voltage signal of signal conditioning circuit output are the noises filtered out outside passband by bandpass filter
The voltage signal of signal；Relationship between PIN tube current Ipd and Vlog output end voltage may be expressed as:
Vlog=Vy × lg (Ipd/IZ), in formula: IZ is logarithm intercept, and Vy is log slope.
3. Gas in Oil of Transformer detection method according to claim 1, characterized in that the laser light source swashs for DFB
Radiant.
4. Gas in Oil of Transformer detection method according to claim 1 or 2 or 3, characterized in that the photodetector is
PIN pipe.
5. Gas in Oil of Transformer detection method according to claim 1 or 2 or 3, characterized in that the gas chamber is transmission
Formula gas chamber or reflective gas chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810106719.1A CN110132864A (en) | 2018-02-02 | 2018-02-02 | Gas in Oil of Transformer detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810106719.1A CN110132864A (en) | 2018-02-02 | 2018-02-02 | Gas in Oil of Transformer detection method |
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| Publication Number | Publication Date |
|---|---|
| CN110132864A true CN110132864A (en) | 2019-08-16 |
Family
ID=67567128
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810106719.1A Pending CN110132864A (en) | 2018-02-02 | 2018-02-02 | Gas in Oil of Transformer detection method |
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| CN (1) | CN110132864A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110763632A (en) * | 2019-12-10 | 2020-02-07 | 国家电网有限公司 | Concentration detection system for dissolved gas in transformer oil |
| CN112255211A (en) * | 2020-10-14 | 2021-01-22 | 海南聚能科技创新研究院有限公司 | Online optical fiber ammonia nitrogen sensor |
-
2018
- 2018-02-02 CN CN201810106719.1A patent/CN110132864A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110763632A (en) * | 2019-12-10 | 2020-02-07 | 国家电网有限公司 | Concentration detection system for dissolved gas in transformer oil |
| CN112255211A (en) * | 2020-10-14 | 2021-01-22 | 海南聚能科技创新研究院有限公司 | Online optical fiber ammonia nitrogen sensor |
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Application publication date: 20190816 |