CN102735783B - Method for calculating chromatogram area of gas in oil - Google Patents
Method for calculating chromatogram area of gas in oil Download PDFInfo
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- CN102735783B CN102735783B CN201210208655.9A CN201210208655A CN102735783B CN 102735783 B CN102735783 B CN 102735783B CN 201210208655 A CN201210208655 A CN 201210208655A CN 102735783 B CN102735783 B CN 102735783B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004364 calculation method Methods 0.000 claims abstract description 10
- 230000006641 stabilisation Effects 0.000 claims abstract description 6
- 238000011105 stabilization Methods 0.000 claims abstract description 6
- 238000011208 chromatographic data Methods 0.000 claims description 4
- 241001269238 Data Species 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 15
- 238000004587 chromatography analysis Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
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Abstract
The invention discloses a method for calculating chromatogram area of gas in oil. According to the invention, the chromatogram area is calculated by the least absolute value regression method. The method comprises the following specific step of: carrying out data mark of ABCDE five points from a chromatogram curve, wherein the point A indicates a chromatogram curve point before a gas enters a chromatographic column and is a first end point of a baseline; the point B indicates a peak value point after the gas enters the chromatographic column; the point C indicates a starting point of a second baseline after the gas completely enters the chromatographic column; the point E indicates a stable point of the second baseline, the distance to the point C is the chromatogram stabilization time; and the point D is obtained according to the regression equation and the first baseline. The chromatogram area is the area enclosed by a chromatogram curve between the points A and B, a regression curve between the points B and D and a line between the points A and D. By the adoption of the method provided by the invention, the process of calculating the chromatogram area is simplified and simultaneously calculation errors are reduced.
Description
Technical field
The present invention relates to oil dissolved gas detection method, in particular, relate to the computing method of irregular figure area in a kind of oil dissolved gas chromatogram.
Background technology
In electric power transformer oil, one of gas detection method uses chromatogram identification various gas componant content, and wherein chromatogram area and height are two important indexs.The time entering chromatographic column due to gas differs, and the time possibility juxtaposition of multiple gases retentate chromatography post, shows that on chromatogram, chromatographic curve data can't return baseline, cause chromatogram areal calculation to occur error.
Summary of the invention
For the defect existed in above-mentioned prior art, technical matters to be solved by this invention is to provide a kind of oil dissolved gas chromatogram area computation method, least absolute value homing method is adopted to carry out chromatogram areal calculation, simplify gas chromatogram area of pictural surface computation process, reduce the error of calculation simultaneously.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is as follows:
1) chromatogram curve data U (x) is obtained, wherein x is the time, figure marks A, B, C, E tetra-location points, here: A point represent gas enter chromatographic column before chromatographic curve point, be first baseline terminal, B point expression gas enters the peak point after chromatographic column, and C point expression gas enters second baseline starting point after chromatographic column completely, E is second baseline stability point, is chromatogram stabilization time at a distance of C point;
2) according to the chromatographic data between B point, C point, carry out least absolute value and return calculating, regression equation: y(x)=ax+b, a, b are constant to be asked here, and x is the horizontal ordinate time of chromatogram, y(x) be regression equation value to be asked;
3) calculation procedure 2) in a, b constant, adopt least absolute value to return to calculate, objective function f(x)=min(∑ | U (x)-y (x) |), here f(x) be objective function, U(x) be chromatogram data, y(x) be regression equation value to be asked, x is all curve datas between chromatogram B point to C point;
4) constant a, b of calculating according to step 3) can obtain regression equation curve, regression equation curve and Article 1 baseline intersect at D point, then chromatogram area just equals the area that the straight line between regression curve between chromatographic curve between AB 2, BD 2, AD 2 surrounds.
Described chromatogram stabilization time is 2 minutes.
Described chromatogram curve data U (x), wherein x is the time, and unit is millisecond.
Method provided by the present invention is the distribution of equal time spacing according to the curve data of chromatogram, computer chromatography area just equals the long-pending algebraic sum that all chromatographic datas point height is multiplied by data time interval, least absolute value homing method is adopted to carry out the computer chromatography area of pictural surface, reference area reduces the impact that chromatographic curve data do not return first baseline, while simplifying chromatogram areal calculation process, reduce the error of calculation.
Accompanying drawing explanation
Fig. 1 is that the inventive method carrys out computer chromatography area of pictural surface process flow diagram;
Fig. 2 is ABCDE 5 position views that embodiment of the present invention chromatogram is demarcated;
Fig. 3 is the chromatogram area schematic diagram that the embodiment of the present invention indicates.
Embodiment
Illustrate below in conjunction with accompanying drawing and be described in further detail embodiments of the invention, but the present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar change thereof, all should list protection scope of the present invention in.
Shown in Fig. 1, it is as follows that the least absolute value homing method that the embodiment of the present invention provides carrys out computer chromatography area of pictural surface method realization flow:
1) chromatogram curve data U (x) is obtained, wherein x is the time, figure marks A, B, C, E tetra-location points, here: A point represent gas enter chromatographic column before chromatographic curve point, be first baseline terminal, B point expression gas enters the peak point after chromatographic column, and C point expression gas enters second baseline starting point after chromatographic column completely, E is second baseline stability point, is chromatogram stabilization time at a distance of C point.
2) according to the chromatographic data between B point, C point, carry out least absolute value and return calculating,
Regression equation: y(x)=ax+b, a, b are constant to be asked here, and x is the horizontal ordinate time of chromatogram, y(x) be regression equation value to be asked.
3) adopt least absolute value to return to calculate, calculation procedure 2) in a, b constant, objective function f(x)=min(∑ | U (x)-y (x) |), here f(x) be objective function, U(x) be chromatogram data, y(x) be regression equation value to be asked, x is all curve datas between chromatogram B point to C point.
4) constant a, b of calculating according to step 3) can obtain regression equation curve, regression equation curve and Article 1 baseline intersect at D point, then chromatogram area just equals the area that the straight line between regression curve between chromatographic curve between AB 2, BD 2, AD 2 surrounds.
Fig. 2 is ABCDE 5 position views that one embodiment of the invention chromatogram is demarcated, and in figure, block curve ABCE is chromatogram data, and dash-dotted line BD is regression equation line, dash straight line AD is first base-line extension.
Fig. 3 is the chromatogram area schematic diagram that one embodiment of the invention indicates, and in figure, the region that curve A B, curve B D, straight line AD surround is chromatogram area.
Claims (3)
1. an oil dissolved gas chromatogram area computation method, for the detection of oil dissolved gas, is characterized in that, comprises step as follows:
1) chromatogram curve data U (x) is obtained, wherein x is the time, figure marks A, B, C, E tetra-location points, here: A point represent gas enter chromatographic column before chromatographic curve point, be first baseline terminal, B point expression gas enters the peak point after chromatographic column, and C point expression gas enters second baseline starting point after chromatographic column completely, E point expression second baseline stability point is chromatogram stabilization time at a distance of C point;
2) according to the chromatographic data between B point, C point, carry out least absolute value and return calculating, regression equation:
Y(x)=ax+b, a, b are constant to be asked here, and x is the horizontal ordinate time of chromatogram,
Y(x) be regression equation value to be asked;
3) calculation procedure 2) in a, b constant, adopt least absolute value to return to calculate, objective function f(x)=min(∑ | U (x)-y (x) |), here f(x) be objective function, U(x) be chromatogram data, y(x) be regression equation value to be asked, x is all curve datas between chromatogram B point to C point;
4) constant a, b of calculating according to step 3) can obtain regression equation curve, regression equation curve and Article 1 baseline intersect at D point, then chromatogram area just equals the area that the straight line between regression curve between chromatographic curve between AB 2, BD 2, AD 2 surrounds.
2. oil dissolved gas chromatogram area computation method according to claim 1, is characterized in that, described chromatogram stabilization time is 2 minutes.
3. oil dissolved gas chromatogram area computation method according to claim 1, it is characterized in that, described chromatogram curve data U (x), wherein millisecond is got by the unit of time x.
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102998404B (en) * | 2012-12-05 | 2014-12-03 | 上海申瑞继保电气有限公司 | Asymmetric chromatographic detection method for multiple component gases in transformer oil |
| CN116399996A (en) * | 2023-06-02 | 2023-07-07 | 海能未来技术集团股份有限公司 | Organic element analysis method and device based on thermal conductivity detection and electronic equipment |
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| CN102507814A (en) * | 2011-10-10 | 2012-06-20 | 天津大学 | Method for separating single peak from multi-peak chromatogram |
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2012
- 2012-06-25 CN CN201210208655.9A patent/CN102735783B/en active Active
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| EP0294121A2 (en) * | 1987-05-29 | 1988-12-07 | Hewlett-Packard Company | Deconvolving chromatographic peaks |
| CN1040798C (en) * | 1991-06-30 | 1998-11-18 | 株式会社岛津制作所 | Absorbance analysis system and data processing method for chromatograph |
| US20040230381A1 (en) * | 1995-02-27 | 2004-11-18 | Hitachi, Ltd. | Data processing apparatus for chromatograph |
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