CN114047278A - Calibration device and method for double-chromatographic-column oil gas online monitoring system - Google Patents
Calibration device and method for double-chromatographic-column oil gas online monitoring system Download PDFInfo
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- CN114047278A CN114047278A CN202111509573.3A CN202111509573A CN114047278A CN 114047278 A CN114047278 A CN 114047278A CN 202111509573 A CN202111509573 A CN 202111509573A CN 114047278 A CN114047278 A CN 114047278A
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- 238000000034 method Methods 0.000 title claims abstract description 31
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- 238000002474 experimental method Methods 0.000 claims description 5
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- 238000005259 measurement Methods 0.000 abstract description 12
- 239000007789 gas Substances 0.000 description 171
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000012806 monitoring device Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/86—Signal analysis
- G01N30/8665—Signal analysis for calibrating the measuring apparatus
Abstract
The invention relates to a calibration device of a double-chromatographic-column oil-gas online monitoring system, which comprises a first chromatographic column, a first gas detector, a second chromatographic column and a second gas detector, wherein the first gas detector is positioned behind the first chromatographic column, the second gas detector is positioned behind the second chromatographic column, the first chromatographic column and the second chromatographic column are connected in series or in parallel to realize separation of sample gas, and the setting parameters of the first chromatographic column are different from those of the second chromatographic column. The calibration device is simple and ingenious in structure, can detect high-concentration gas and low-concentration gas, and can effectively guarantee the measurement result, so that the safety of the transformer in the using process is guaranteed. The second invention aims to provide a calibration method of the double-chromatographic-column oil gas online monitoring system, which is applied to the device and has the advantages of ensuring the measurement result and further ensuring the safety of the transformer in the use process.
Description
Technical Field
The invention relates to the technical field of transformer online monitoring, in particular to a calibration device of a dual-chromatographic-column oil gas online monitoring system.
Background
The oil-immersed power transformer is one of important devices in power supply and distribution systems of industrial and mining enterprises and civil buildings, and reduces the voltage of a 10(6) kV or 35kV network to 230/400V bus voltage used by users. The product is suitable for alternating current of 50(60) Hz and three-phase maximum rated capacity of 2500kVA (single-phase maximum rated capacity 833kVA, a single-phase transformer is not generally recommended), can be used indoors or outdoors, can be arranged on a pole when the capacity is 315kVA or below, and has the environment temperature of not higher than 40 ℃, not lower than-25 ℃, the maximum daily average temperature of 30 ℃, the maximum annual average temperature of 20 ℃, the relative humidity of not more than 90% (environment temperature of 25 ℃) and the altitude of not more than 1000 m. If the above-mentioned conditions are not met, the rating should be adjusted appropriately according to the regulations of GB 6450-86.
The measurement concentration ranges of each component gas in the transformer oil gas online monitoring system are different, and according to the latest electric power industry standard DL/T1498.2-2016 part 2 of the technical specification of the transformer equipment online monitoring device: the measurement range of a multi-component online monitoring device in an online monitoring device for dissolved gas in transformer oil is specified, the lowest upper limit of the detection range is 1000uL/L of hydrocarbon, and the highest upper limit of the detection range is 15000uL/L of carbon dioxide. Because the concentration of each gas is detected by generally adopting a chromatographic column method and a spectroscopic method at present, and actually based on the reasons of a system design scheme, system construction complexity, device manufacturing cost and the like, if gain adjustment is not carried out at a gas concentration signal acquisition end, system detection can only meet the detection of low-concentration gas, and when high-concentration gas is detected, a voltage signal of the gas concentration is subjected to signal saturation during AD conversion detection, so that the measurement cannot be carried out.
The spectrum method can realize detection by utilizing gas concentration and voltage signal gain adjustment to achieve low and high concentration gas because one-time gas sampling and multiple measurements can be realized. In the chromatography, after the primary gas sample introduction, the gases of each component continuously flow through the chromatographic column under the pressure of the carrier gas and finally reach the gas detector, and the gas detector usually detects the concentration value of each gas by adopting the thermal conductivity principle, so that the high-concentration gas passes through the gas detector and then is subjected to gain amplification through a signal voltage value, the voltage signal of the gas concentration is subjected to signal saturation during AD conversion detection, as each gas passes through the thermal conductivity gas detector after the chromatographic column is separated, once the gas concentration voltage signal reaches the AD conversion signal saturation value, the gas flow cannot be interrupted at the moment, the secondary voltage signal gain adjustment cannot be performed like the spectrum method, otherwise, the gas peak spectrogram is caused, the measurement is inaccurate, the rest components are seriously inaccurate in measurement, affecting the measurement result.
Disclosure of Invention
In order to overcome the defects in the prior art, the first invention of the invention aims to provide the calibration device of the dual-chromatographic-column oil-gas online monitoring system, which has a simple and ingenious structure, can detect high-concentration gas and low-concentration gas, and can effectively ensure the measurement result, thereby ensuring the safety of the transformer in the use process. The second invention aims to provide a calibration method of the double-chromatographic-column oil gas online monitoring system, which is applied to the device and has the advantages of ensuring the measurement result and further ensuring the safety of the transformer in the use process.
The calibration device of the dual-chromatographic-column oil-gas online monitoring system and the calibration method of the dual-chromatographic-column oil-gas online monitoring system are technically interrelated and belong to the same invention concept.
In order to achieve the first object, the invention adopts the following technical scheme: the utility model provides a calibration device of two chromatographic column oil gas on-line monitoring system, includes chromatographic column one, first gas detector, chromatographic column two and second gas detector, first gas detector is located behind the chromatographic column one, the second gas detector is located behind the chromatographic column two, chromatographic column one with establish ties or parallelly connected realization separation appearance gas between the chromatographic column two, the setting parameter of chromatographic column one is different from chromatographic column two.
As a preferred embodiment of the present invention, the setting parameters of the first chromatographic column and the second chromatographic column include, but are not limited to, the separation interval time of the gas and the response rate of the gas.
In a preferred embodiment of the present invention, the second gas detector detects a higher concentration of the sample gas than the first gas detector detects.
In order to achieve the second object, the invention adopts the following technical scheme: a calibration method of a double-chromatographic-column oil-gas online monitoring system comprises the following steps: s1, performing experiments in advance, namely enabling the gas separated by the first chromatographic column to pass through a low-concentration first gas detector and enabling the gas separated by the second chromatographic column to pass through a high-concentration second gas detector to obtain a reference relation; s2, enabling the sample gas to enter a chromatographic column I, a first gas detector, a chromatographic column II and a second gas detector respectively to obtain two different gas concentration chromatograms; s3, when the voltage signal of the first gas detector is not saturated, the gas concentration value is based on the signal value; when the first gas detector voltage signal, which is a low concentration detector, is saturated, then the gas concentration value is based on the signal of the second gas detector, which is a high concentration gas detector.
The utility model provides a calibration device of two chromatographic column oil gas on-line monitoring system, includes chromatographic column one, first gas detector, chromatographic column two and second gas detector, first gas detector is located behind the chromatographic column one, the second gas detector is located behind the chromatographic column two, chromatographic column one with establish ties between the chromatographic column two or parallelly connected realization separation appearance gas, chromatographic column one with the chromatographic column two is the same, first gas detector with the second gas detector sets up the parameter difference.
In a preferred embodiment of the present invention, the setting parameters of the first gas detector and the second gas detector include, but are not limited to, a detection sensitivity value and a detection voltage signal value gain.
Correspondingly, in order to achieve the second invention purpose, the invention adopts the following technical scheme: a calibration method of a double-chromatographic-column oil-gas online monitoring system comprises the following steps: s1, performing experiments in advance, namely enabling the gas separated by the first chromatographic column to pass through a low-concentration first gas detector and enabling the gas separated by the second chromatographic column to pass through a high-concentration second gas detector to obtain a reference relation; s2, enabling the sample gas to enter a chromatographic column I, a first gas detector, a chromatographic column II and a second gas detector respectively to obtain two different gas concentration chromatograms; s3, the second gas detector being a high concentration gas detector has an effective voltage signal only for gases above a relatively high concentration threshold, the first gas detector being a low concentration gas detector has a functional relationship with the effective voltage value generated for the concentration of the low concentration gas, and the voltage signal value is saturated when the relative low concentration threshold is exceeded, and the second gas detector fails.
Compared with the prior art, the invention has the beneficial effects that: the calibration device and the method of the dual-chromatographic-column oil-gas online monitoring system have simple and ingenious structure, sample gas is separated in series or in parallel by utilizing two chromatographic columns, then the sample gas respectively enters the first chromatographic column, the first gas detector which is a low-concentration gas detector, the second chromatographic column and the second gas detector which is a high-concentration gas detector, two different gas concentration chromatograms appear, the high-concentration gas and the low-concentration gas can be detected by utilizing the parameter relationship which is tested in advance, the measurement result can be effectively ensured, and the safety of a transformer in the using process is further ensured.
Drawings
FIG. 1 is a schematic structural diagram of a calibration device of a dual-chromatographic-column online oil-gas monitoring system in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a calibration device of a dual-chromatographic-column oil-gas online monitoring system in an embodiment of the present invention.
Reference numerals: 1. a first chromatographic column; 2. a first gas detector; 3. a second chromatographic column; 4. a second gas detector.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of 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 invention.
The first embodiment is as follows: as shown in fig. 1 and 2, a calibration apparatus for a dual-chromatographic-column oil-gas online monitoring system includes a first chromatographic column 1, a first gas detector 2, a second chromatographic column 3, and a second gas detector 4, where the first gas detector 2 is located behind the first chromatographic column 1, the second gas detector 4 is located behind the second chromatographic column 3, the first chromatographic column 1 and the second chromatographic column 3 are connected in series or in parallel to separate sample gas, and setting parameters of the first chromatographic column 1 are different from those of the second chromatographic column 3. The method comprises the steps of utilizing two chromatographic columns to carry out series or parallel separation on sample gas, wherein parameters such as separation interval time of a first chromatographic column 1 to the gas, response rate of the gas and the like are different from those of a second chromatographic column 3, two different gas concentration chromatograms appear after the sample gas respectively enters the first chromatographic column 1, a first gas detector 2 which is a low-concentration gas detector, the second chromatographic column 3 and a second gas detector 4 which is a high-concentration gas detector, and utilizing a parameter relation which is tested in advance to realize that the gas separated by one chromatographic column passes through the detector for the high-concentration gas and the gas separated by the other chromatographic column passes through the detector for the low-concentration gas.
Specifically, the method for realizing the calibration device of the double-chromatographic-column oil gas online monitoring system comprises the following steps: when the voltage signal of the first gas detector 2, which is a low concentration gas detector, is not saturated, the gas concentration value is based on the signal value; when the voltage signal of the first gas detector 2, which is a low concentration gas detector, is saturated, the gas concentration value is based on the detector signal of the high concentration gas. The first chromatographic column 1 and the second chromatographic column 3 do not specify the high-low concentration attributes, and are not distinguished in physical dimension, time dimension and the like.
The first gas detector 2, which is a low concentration gas detector, and the second gas detector 4, which is a high concentration gas detector, do not have a strictly defined relative relationship in physical properties, functional characteristics, index parameters. This is merely an expression of one method and any other method falling within the category on which this method is based is encompassed.
Example two: the utility model provides a calibration device of two chromatographic column oil gas on-line monitoring system, includes chromatographic column 1, first gas detector 2, chromatographic column two 3 and second gas detector 4, above-mentioned first gas detector 2 is located behind above-mentioned chromatographic column 1, above-mentioned second gas detector 4 is located behind above-mentioned chromatographic column two 3, establish ties between above-mentioned chromatographic column 1 and above-mentioned chromatographic column two 3 or parallelly connected realization separation appearance gas, above-mentioned chromatographic column 1 is the same with above-mentioned chromatographic column two 3, above-mentioned first gas detector 2 is different with above-mentioned second gas detector 4 setting parameter. By using the two chromatographic columns to carry out series or parallel separation on the sample gas, the chromatographic column I1 and the chromatographic column II 3 have no obvious difference on the physical properties, so that the separation indexes and parameters of the gas have no obvious difference. However, in this embodiment, the gas concentration detection sensitivities of the second gas detector 4 which is a high concentration gas detector and the first gas detector 2 which is a low concentration gas detector are not uniform or the detection voltage signal value gains are not uniform or other methods can realize a method of differentiating the final signal values of the detectors.
After sample gas respectively enters the chromatographic column I1, the first gas detector 2, the chromatographic column II 3 and the second gas detector 4, two different gas concentration chromatograms are generated, and the condition that the gas separated by one of the chromatographic columns passes through the detector of high-concentration gas and the gas separated by the other chromatographic column passes through the detector of low-concentration gas is realized by utilizing the parameter relationship which is tested in advance.
Specifically, the method for realizing the calibration device of the double-chromatographic-column oil gas online monitoring system comprises the following steps: the high concentration gas detector has an effective voltage signal only for gases above a relatively high concentration threshold, while the low concentration gas detector has a functional relationship with an effective voltage value generated by the concentration of the low concentration gas, and the voltage signal value becomes saturated and fails after the effective voltage value exceeds the relatively low concentration threshold. The detection of sample gas with high and low concentration can be realized.
The first chromatographic column 1 and the second chromatographic column 3 do not specify the high-low concentration attributes, and are not distinguished in physical dimension, time dimension and the like.
The low concentration gas detector and the high concentration gas detector do not have a strictly defined relative relationship in physical properties, functional characteristics, and index parameters. This is merely an expression of one method and any other method falling within the category on which this method is based is encompassed.
Above-mentioned calibration arrangement simple structure is ingenious, through utilizing two chromatographic columns to carry out series connection or parallelly connected separation appearance gas, again with appearance gas respectively get into chromatographic column one, be the first gas detector of low concentration gas detector, chromatographic column two, for behind the second gas detector of high concentration gas detector, two different gas concentration chromatograms will appear, utilize the parameter relation that experiments in advance, can detect high concentration gas and low concentration gas, can effectively guarantee the measuring result simultaneously, and then guarantee the security of transformer in the use.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention; thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the reference numerals in the figures are used more here: 1. a first chromatographic column; 2. a first gas detector; 3. a second chromatographic column; 4. Second gas detector, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (7)
1. The utility model provides a calibration device of two chromatographic column oil gas on-line monitoring system which characterized in that, includes chromatographic column (1), first gas detector (2), chromatographic column two (3) and second gas detector (4), first gas detector (2) are located behind chromatographic column one (1), second gas detector (4) are located behind chromatographic column two (3), chromatographic column one (1) with establish ties or parallelly connected realization separation appearance gas between chromatographic column two (3), the setting parameter of chromatographic column one (1) is different from chromatographic column two (3).
2. The calibration device of the dual-chromatographic-column online oil and gas monitoring system as claimed in claim 1, wherein the setting parameters of the first chromatographic column (1) and the second chromatographic column (3) include, but are not limited to, the separation interval time of the gas and the response rate of the gas.
3. The calibration device of the dual-chromatographic-column oil-gas online monitoring system according to claim 2, wherein the concentration of the sample gas detected by the second gas detector (4) is higher than that detected by the first gas detector (2).
4. A calibration method of a dual-chromatographic-column online oil-gas monitoring system is applied to the calibration device of the dual-chromatographic-column online oil-gas monitoring system as claimed in any one of the claims 1 to 3; the method is characterized by comprising the following steps: s1, performing experiments in advance, namely enabling the gas separated by the chromatographic column I (1) to pass through a low-concentration first gas detector (2), and enabling the gas separated by the chromatographic column II (3) to pass through a high-concentration second gas detector (4), so as to obtain a reference relation; s2, enabling the sample gas to enter a chromatographic column I (1), a first gas detector (2), a chromatographic column II (3) and a second gas detector (4) respectively to obtain two different gas concentration chromatograms; s3, when the voltage signal of the first gas detector (2) which is a low concentration detector is not saturated, the gas concentration value is based on the signal value; when the voltage signal of the first gas detector (2), which is a low concentration detector, is saturated, then the gas concentration value is based on the signal of the second gas detector (4), which is a high concentration gas detector.
5. The utility model provides a calibration device of two chromatographic column oil gas on-line monitoring system which characterized in that, includes chromatographic column (1), first gas detector (2), chromatographic column two (3) and second gas detector (4), first gas detector (2) are located behind chromatographic column one (1), second gas detector (4) are located behind chromatographic column two (3), chromatographic column one (1) with establish ties between chromatographic column two (3) or parallelly connected realization separation appearance gas, chromatographic column one (1) with chromatographic column two (3) are the same, first gas detector (2) with second gas detector (4) set up the parameter difference.
6. The calibration device of the dual-chromatographic-column online oil and gas monitoring system as recited in claim 5, characterized in that the setting parameters of the first gas detector (2) and the second gas detector (4) include, but are not limited to, a detection sensitivity value and a detection voltage signal value gain.
7. A calibration method of a dual-chromatographic-column online oil-gas monitoring system is applied to the calibration device of the dual-chromatographic-column online oil-gas monitoring system as claimed in any one of the claims 5 to 6; the method is characterized by comprising the following steps: s1, performing experiments in advance, namely enabling the gas separated by the chromatographic column I (1) to pass through a low-concentration first gas detector (2), and enabling the gas separated by the chromatographic column II (3) to pass through a high-concentration second gas detector (4), so as to obtain a reference relation; s2, enabling the sample gas to enter a chromatographic column I (1), a first gas detector (2), a chromatographic column II (3) and a second gas detector (4) respectively to obtain two different gas concentration chromatograms; s3, the second gas detector (4) which is a high concentration gas detector has effective voltage signals only for the gas above the relatively high concentration threshold, the first gas detector (2) which is a low concentration gas detector generates functional relation for the effective voltage values generated by the concentration of the low concentration gas, and the voltage signal value is saturated after the relatively low concentration threshold is exceeded, and then the second gas detector fails.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115060843A (en) * | 2022-07-11 | 2022-09-16 | 广东电网有限责任公司 | MEMS chromatographic column and thermal conductivity detector integrated device |
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| US20140076023A1 (en) * | 2012-09-05 | 2014-03-20 | Siemens Aktiengesellschaft | Gas chromatograph |
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