CN112945345A - Oil level detection method for light oil storage system - Google Patents
Oil level detection method for light oil storage system Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
- G01F23/16—Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid
- G01F23/162—Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid by a liquid column
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
Abstract
The invention discloses an oil level detection method for a light oil storage system, which is characterized in that the initial oil level height h of the medium oil level in oil storage equipment under the standard condition of 20 ℃ is predetermined20(ii) a Determining the expansion coefficients of the medium corresponding to a plurality of temperature intervals; according to the initial oil level height h20Determining that the current oil level is at the position of an oil storage device, and determining a height increase amount corresponding to the position of the oil storage device; determining a corresponding expansion coefficient according to a medium in the oil storage equipment and the current actual temperature of the medium; according to the determined height increment and the initial oil level height h20An actual oil level height h is determined. The invention analyzes the real-time oil level height signal, collects the real-time temperature to calculate the height increment, has much higher precision than the traditional pressure type oil level gauge for measuring and calculating the oil level according to the average temperature compensation, and has the measurement precision error less than or equal to 1CM through test verification.
Description
Technical Field
The invention particularly relates to the technical field of oil level detection, and particularly relates to an oil level detection method for a light oil storage system.
Background
Along with the development of power grid construction in China, the requirement of an electric power system on intelligent monitoring of the running state of a transformer is higher and higher, and in the aspect of oil level monitoring of the transformer, oil level monitoring based on a pressure sensing principle is applied.
With the large-scale construction of the national direct-current transmission project, in order to guarantee the requirements of safe operation and intellectualization of the transformer, two oil level gauges with different principles are required to be installed on the oil storage cabinet, and the pressure type oil level gauge becomes one of the choices, so that the accurate application of the pressure type oil level gauge to measure the oil level is very necessary through the research on the pressure type oil level gauge.
The defects of the existing pressure type oil level detection method
(1) One way is to measure the height of the oil level directly by pressure. This approach does not take into account thermal expansion of the media and the effect of the housing shape on the oil level, so the test conclusions are false.
(2) Another pressure type oil level indicator takes the expansion coefficient into consideration, but the algorithm principle has errors
A. The average temperature is calculated according to the pressure change generated by thermal expansion, the expansion volume of the medium oil is calculated according to the average temperature, and the oil level is calculated according to the expansion volume and the shape of the oil storage system.
But in fact, the capsule of the oil storage system is communicated with the outside atmosphere through the breather, and can be regarded as an open container, so that under the condition that the quality of the medium oil is not changed, namely the pressure is constant, the average temperature is calculated according to the pressure change, the expansion volume measured according to the average temperature is almost zero, and the measured oil level height, namely the oil level height under the standard condition of 20 ℃, does not reflect the oil level height change caused by expansion. The measurement error is large.
B. Does not take into account the difference of the expansion coefficients of the media in different temperature intervals
In the conventional method for measuring the oil level by pressure, temperature compensation is also considered, but the expansion coefficient of the medium is taken as a unique fixed value. In practice, the expansion coefficients of the medium in different temperature ranges are not exactly the same, which results in large measurement errors.
C. The influence of factors such as the shape of an oil storage system, the initial position of the liquid level and the like on the change of the expansion height is not considered
In the conventional measurement, an oil storage system is regarded as a regular container with equal sectional area, the height variation of the oil level is obtained by dividing simple volume variation by the sectional area, but the actual oil storage system consists of a main body oil tank, an auxiliary oil tank (oil conservator), a connecting pipe and the like, the sectional area of each part is unequal, and under the condition that the expansion volume of a medium is constant, the height variation of the oil level caused by expansion of different parts of the liquid level is different, so that the height error of the oil level calculated according to the regular container is larger.
Disclosure of Invention
In view of the above, the main object of the present invention is to provide an oil level detection method for a light oil storage system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the embodiment of the invention provides an oil level detection method for a light oil storage system, which comprises the following steps:
predetermining an initial oil level h for the medium oil level in an oil storage device at a nominal condition of 20 DEG C20；
Determining the expansion coefficients of the medium corresponding to a plurality of temperature intervals;
according to the initial oil level height h20Determining that the current oil level is at the position of an oil storage device, and determining a height increase amount corresponding to the position of the oil storage device;
determining a corresponding expansion coefficient according to a medium in the oil storage equipment and the current actual temperature of the medium;
according to the determined height increment and the initial oil level height h20An actual oil level height h is determined.
In the scheme, the predetermined initial oil level height h of the medium oil level in the oil storage equipment under the standard condition of 20 DEG C20The method specifically comprises the following steps: the density of the medium at 20 ℃ is rho20The bottom pressure is P, and the initial oil level height is h20，h20＝100000P/ρ20g, wherein g is a local gravitational acceleration value.
In the foregoing scheme, the determining expansion coefficients corresponding to a plurality of temperature intervals of the medium specifically includes: uniformly dividing a plurality of temperature intervals between 20 ℃ and 100 ℃, and respectively determining the expansion coefficient of the medium corresponding to each temperature interval.
In the above scheme, the oil level is determined according to the initial oil level height h20Determining that the current oil level is at the position of the oil storage device, specifically: height h according to the shape of a section of oil storage equipmentxHeight h from initial oil level20The comparison of (a) determines that the current oil level is at the location of the oil storage device.
In the above-mentioned aspect, the initial oil level height h20Sequentially comparing the oil level with the height interval of each section of upper and lower shapes from the bottom to the top in the oil storage equipment, and if the initial oil level height h20Within the height interval of each section of the upper and lower shapes, determining that the current oil level is within the upper section shape position of each section of the upper and lower shapes, and if the initial oil level height h20If the height interval is larger than the height interval of each section of shape, the height interval of each section of shape up and down at the next position is continuously judged until the height h of the initial oil level20Within the height interval of each section of shape.
In the scheme, when the initial oil level height h is less than or equal to 020＜h1When the current oil level is determined to be at the height h1The corresponding section of shape; when h is generated1Less than or equal to the height h of the initial oil level20＜h1+h2When the current oil level is determined to be at the height h2The corresponding section of shape; when h is generated1+...+hX-1Less than or equal to the height h of the initial oil level20＜h1+...+hXWhen the current oil level is determined to be at the height hXThe corresponding section of shape; h is1～hxThe height of each segment shape from bottom to top.
In the foregoing solution, the determining the height increase amount corresponding to the position of the oil storage device specifically includes: after determining that the current oil level is at the location of the oil storage device, α [ S ] is determined according to the formula Δ h1h1+...+Sx-1hx-1+(h20-h1-...-hx-1)Sx〕(T-20)/SxDetermining the height increase Δ h, S1～SxIs the cross-sectional area of each segment, h1～hxT is the height of each section shape and is the collected temperature value.
In the above-mentioned aspect, the increase amount of the height according to the determination and the initial oil level height h20Determining the actual oil level height h, specifically: according to the formula h ═ h20+ Δ h determines the actual oil level height h.
Compared with the prior art, the method analyzes the real-time oil level height signal, collects the real-time temperature and calculates the height increment, has much higher precision than the traditional pressure type oil level gauge for measuring and calculating the oil level according to average temperature compensation, and is verified by tests that the measurement precision error is less than or equal to 1 CM.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a flowchart of an oil level detection method for a light oil storage system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an oil storage apparatus in an oil level detection method for a light oil storage system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a three-stage oil storage device in an oil level detection method for a light oil storage system according to an embodiment of the present invention, when an actual oil level is in a first stage.
Fig. 4 is a schematic structural diagram of a three-stage oil storage device in an oil level detection method for a light oil storage system according to an embodiment of the present invention, where an actual oil level is in a second stage;
fig. 5 is a schematic structural diagram of a five-segment oil storage device in an oil level detection method for a light oil storage system according to an embodiment of the present invention, when an actual oil level is in a fifth segment;
fig. 6 is a schematic structural diagram of a seven-segment oil storage device in an oil level detection method for a light oil storage system according to an embodiment of the present invention, when an actual oil level is in a seventh segment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
An embodiment of the present invention provides an oil level detection method for a light oil storage system, as shown in fig. 1, the method is implemented by the following steps:
step 101: predetermining an initial oil level h for the medium oil level in an oil storage device at a nominal condition of 20 DEG C20；
In particular, the density of the medium at 20 ℃ is ρ20The bottom pressure is P, and the initial oil level height is h20，h20＝100000P/ρ20g, wherein g is a local gravitational acceleration value.
Step 102: determining the expansion coefficients of the medium corresponding to a plurality of temperature intervals;
specifically, a plurality of temperature intervals are uniformly divided between 20 ℃ and 100 ℃, and the expansion coefficient of the medium corresponding to each temperature interval is respectively determined.
In some embodiments, the expansion coefficient of the temperature range 20-30 ℃, the expansion coefficient of the temperature range 30-40 ℃, the expansion coefficient of the temperature range 40-50 ℃, the expansion coefficient of the temperature range 50-60 ℃, the expansion coefficient of the temperature range 60-70 ℃, the expansion coefficient of the temperature range 70-80 ℃, the expansion coefficient of the temperature range 80-90 ℃ and the expansion coefficient of the temperature range 90-100 ℃ are determined, although the number of the temperature ranges may be adjusted as required, the amplitude of the temperature ranges may be adjusted, and the amplitudes of the temperature ranges may be the same or different.
Step 103: according to the initial oil level height h20Determining that the current oil level is at the position of an oil storage device, and determining a height increase amount corresponding to the position of the oil storage device;
in particular, the height h according to a certain section of the shape in the oil storage equipmentxHeight h from initial oil level20The comparison of (a) determines that the current oil level is at the location of the oil storage device.
The initial oil level height h20Sequentially comparing the oil level with the interval of the upper and lower shapes from the bottom to the top in the oil storage equipment, and if the initial oil level height h20Within the height interval of each section of the upper and lower shapes, determining that the current oil level is within the upper section shape position of each section of the upper and lower shapes, and if the initial oil level height h20If the height interval is larger than the height interval of each section of shape, the height interval of each section of shape up and down at the next position is continuously judged until the height h of the initial oil level20Within the height interval of each section of shape.
As shown in FIG. 2, when 0. ltoreq. the initial oil level height h20＜h1When the current oil level is determined to be at the height h1The corresponding section of shape; when h is generated1Less than or equal to the height h of the initial oil level20＜h1+h2When the current oil level is determined to be at the height h2The corresponding section of shape; when h is generated1+...+hX-1Less than or equal to the height h of the initial oil level20＜h1+...+hXWhen the current oil level is determined to be at the height hXThe corresponding section of shape; h is1～hxThe height of each segment shape from bottom to top.
After determining that the current oil level is at the location of the oil storage device, α [ S ] is determined according to the formula Δ h1h1+...+Sx-1hx-1+(h20-h1-...-hx-1)Sx〕(T-20)/SxDetermining the height increase Δ h, S1～SxIs the cross-sectional area of each segment, h1～hxT is the height of each section shape and is the collected temperature value.
In some embodiments, taking the oil storage apparatus comprising three sections as an example, as shown in fig. 3, the current oil level is at h1Within the corresponding shape, Δ h ═ α h20(T-20) as shown in FIG. 4, the current oil level is at h2Within the corresponding shape, Δ h ═ α [ S ], [1h1+(h20-h1)S2〕(T-20)}/S2The current oil level is at h3Within the corresponding shape, Δ h ═ α [ S ], [1h1+S2h2+(h20-h1-h2)S3〕(T-20)}/S3。
Step 104: determining a corresponding expansion coefficient according to a medium in the oil storage equipment and the current actual temperature of the medium;
specifically, determining a corresponding expansion coefficient according to a medium in the oil storage equipment and the current actual temperature of the medium; the method is characterized in that the expansion coefficient of the medium is calculated according to the measured medium temperature, and the expansion coefficient is calculated according to the measured medium temperature.
Step 105: according to the determined height increment and the initial oil level height h20An actual oil level height h is determined.
In particular, according to the formula h ═ h20+ Δ h determines the actual oil level height h.
In some embodiments, taking the oil storage apparatus comprising three sections as an example, as shown in fig. 3, the current oil level is at h1Within the corresponding shape, Δ h ═ α h20(T-20)，h＝h20+Δh；
As shown in fig. 4, the current oil level is at h2Within the corresponding shape, Δ h ═ α [ S ], [1h1+(h20-h1)S2〕(T-20)}/S2，h＝h20+Δh；
The current oil level is at h3Within the corresponding shape, Δ h ═ α [ S ], [1h1+S2h2+(h20-h1-h2)S3〕(T-20)}/S3，h＝h20+Δh。
Example 1
An embodiment of the present invention provides an oil level detection method for a light oil storage system, as shown in fig. 5, taking an oil storage device as an example with a 5-segment shape, the method is implemented by the following steps:
step 101: predetermining an initial oil level h for the medium oil level in an oil storage device at a nominal condition of 20 DEG C20；
In particular, the density of the medium at 20 ℃ is ρ20The bottom pressure is P, and the initial oil level height is h20，h20＝100000P/ρ20g, wherein g is a local gravitational acceleration value.
Step 102: determining the expansion coefficients of the medium corresponding to a plurality of temperature intervals;
specifically, a plurality of temperature intervals are uniformly divided between 20 ℃ and 100 ℃, and the expansion coefficient of the medium corresponding to each temperature interval is respectively determined.
Determining the expansion coefficient of the temperature interval 20-30 ℃, the expansion coefficient of the temperature interval 30-40 ℃, the expansion coefficient of the temperature interval 40-50 ℃, the expansion coefficient of the temperature interval 50-60 ℃, the expansion coefficient of the temperature interval 60-70 ℃, the expansion coefficient of the temperature interval 70-80 ℃, the expansion coefficient of the temperature interval 80-90 ℃ and the expansion coefficient of the temperature interval 90-100 ℃, naturally adjusting the number of the temperature intervals according to the needs, adjusting the amplitude of the temperature intervals, and enabling the amplitudes of the temperature intervals to be the same or different.
Step 103: according to the initial oil level height h20Determining that the current oil level is at the position of an oil storage device, and determining a height increase amount corresponding to the position of the oil storage device;
specifically, when 0 is less than or equal to the initial oil level height h20＜h1When the current oil level is determined to be at the height h1The corresponding section of shape;
when h is generated1Less than or equal to the height h of the initial oil level20＜h1+h2When the current oil level is determined to be at the height h2The corresponding section of shape;
when h is generated1+h2Less than or equal to the height h of the initial oil level20＜h1+h2+h3When the current oil level is determined to be at the height h3The corresponding section of shape;
when h is generated1+h2+h3Less than or equal to the height h of the initial oil level20＜h1+h2+h3+h4When the current oil level is determined to be at the height h4The corresponding section of shape;
when h is generated1+h2+h3+h4Less than or equal to the height h of the initial oil level20＜h1+h2+h3+h4+h5When the current oil level is determined to be at the height h5The corresponding section of shape;
h1～h5the height of each segment shape from bottom to top.
The current oil level is at h1Within the corresponding shape, Δ h ═ α h20(T-20)；
The current oil level is at h2Within the corresponding shape, Δ h ═ α [ S ], [1h1+(h20-h1)S2〕(T-20)}/S2；
The current oil level is at h3Within the corresponding shape, Δ h ═ α [ S ], [1h1+S2h2+(h20-h1-h2)S3〕(T-20)}/S3；
The current oil level is at h4Within the corresponding shape, Δ h ═ α [ S ], [1h1+S2h2+S3h3+(h20-h1-h2-h3)S4〕(T-20)}/S4；
The current oil level is at h5Within the corresponding shape, Δ h ═ α [ S ], [1h1+S2h2++S3h3+S4h4+
(h20-h1-h2-h3-h4)S5〕(T-20)}/S5。
Step 104: determining a corresponding expansion coefficient according to a medium in the oil storage equipment and the current actual temperature of the medium;
specifically, determining a corresponding expansion coefficient according to a medium in the oil storage equipment and the current actual temperature of the medium; the method is characterized in that the expansion coefficient of the medium is calculated according to the measured medium temperature, and the expansion coefficient is calculated according to the measured medium temperature.
Step 105: according to the determined height increment and the initial oil level height h20An actual oil level height h is determined.
Specifically, the current oil level is at h2Within the corresponding shape, Δ h ═ α [ S ], [1h1+(h20-h1)S2〕(T-20)}/S2，h＝h20+Δh；
The current oil level is at h3Within the corresponding shape, Δ h ═ α [ S ], [1h1+S2h2+(h20-h1-h2)S3〕(T-20)}/S3，h＝h20+Δh；
The current oil level is at h4Within the corresponding shape, Δ h ═ α [ S ], [1h1+S2h2+S3h3+(h20-h1-h2-h3)S4〕(T-20)}/S4，h＝h20+Δh；
The current oil level is at h5Within the corresponding shape, Δ h ═ α [ S ], [1h1+S2h2++S3h3+S4h4+(h20-h1-h2-h3-h4)S5〕(T-20)}/S5，h＝h20+Δh。
Example 2
An embodiment of the present invention provides an oil level detection method for a light oil storage system, as shown in fig. 6, taking an oil storage device as an example with a 7-segment shape, the method is implemented by the following steps:
step 101: predetermining the level of medium in oil-storage equipment at standard conditions of 20 DEG CInitial oil level height h20；
In particular, the density of the medium at 20 ℃ is ρ20The bottom pressure is P, and the initial oil level height is h20，h20＝100000P/ρ20g, wherein g is a local gravitational acceleration value.
Step 102: determining the expansion coefficients of the medium corresponding to a plurality of temperature intervals;
specifically, a plurality of temperature intervals are uniformly divided between 20 ℃ and 100 ℃, and the expansion coefficient of the medium corresponding to each temperature interval is respectively determined.
Determining the expansion coefficient of the temperature interval 20-30 ℃, the expansion coefficient of the temperature interval 30-40 ℃, the expansion coefficient of the temperature interval 40-50 ℃, the expansion coefficient of the temperature interval 50-60 ℃, the expansion coefficient of the temperature interval 60-70 ℃, the expansion coefficient of the temperature interval 70-80 ℃, the expansion coefficient of the temperature interval 80-90 ℃ and the expansion coefficient of the temperature interval 90-100 ℃, naturally adjusting the number of the temperature intervals according to the needs, adjusting the amplitude of the temperature intervals, and enabling the amplitudes of the temperature intervals to be the same or different.
Step 103: according to the initial oil level height h20Determining that the current oil level is at the position of an oil storage device, and determining a height increase amount corresponding to the position of the oil storage device;
specifically, when 0 is less than or equal to the initial oil level height h20＜h1When the current oil level is determined to be at the height h1The corresponding section of shape;
when h is generated1Less than or equal to the height h of the initial oil level20＜h1+h2When the current oil level is determined to be at the height h2The corresponding section of shape;
when h is generated1+h2Less than or equal to the height h of the initial oil level20＜h1+h2+h3When the current oil level is determined to be at the height h3The corresponding section of shape;
when h is generated1+h2+h3Less than or equal to the height h of the initial oil level20＜h1+h2+h3+h4When it is determinedThe current oil level is at a height h4The corresponding section of shape;
when h is generated1+h2+h3+h4Less than or equal to the height h of the initial oil level20＜h1+h2+h3+h4+h5When the current oil level is determined to be at the height h5The corresponding section of shape;
when h is generated1+h2+h3+h4+h5Less than or equal to the height h of the initial oil level20＜h1+h2+h3+h4+h5+h6When the current oil level is determined to be at the height h6The corresponding section of shape;
when h is generated1+h2+h3+h4+h5+h6Less than or equal to the height h of the initial oil level20＜h1+h2+h3+h4+h5+h6+h7When the current oil level is determined to be at the height h7The corresponding section of shape;
h1～h7the height of each segment shape from bottom to top.
The current oil level is at h1Within the corresponding shape, Δ h ═ α h20(T-20)；
The current oil level is at h2Within the corresponding shape, Δ h ═ α [ S ], [1h1+(h20-h1)S2〕(T-20)}/S2；
The current oil level is at h3Within the corresponding shape, Δ h ═ α [ S ], [1h1+S2h2+(h20-h1-h2)S3〕(T-20)}/S3；
The current oil level is at h4Within the corresponding shape, Δ h ═ α [ S ], [1h1+S2h2+S3h3+(h20-h1-h2-h3)S4〕(T-20)}/S4；
The current oil level is at h5Within the corresponding shape, Δ h ═ α [ S ], [1h1+S2h2++S3h3+S4h4+
(h20-h1-h2-h3-h4)S5〕(T-20)}/S5。
The current oil level is at h6Within the corresponding shape, Δ h ═ α [ S ], [1h1+S2h2++S3h3+S4h4+S5h5+
(h20-h1-h2-h3-h4-h5)S6〕(T-20)}/S6。
The current oil level is at h7Within the corresponding shape, Δ h ═ α [ S ], [1h1+S2h2++S3h3+S4h4+S5h5+S6h6+(h20-h1-h2-h3-h4-h5-h6)S7〕(T-20)}/S7。
Step 104: determining a corresponding expansion coefficient according to a medium in the oil storage equipment and the current actual temperature of the medium;
specifically, determining a corresponding expansion coefficient according to a medium in the oil storage equipment and the current actual temperature of the medium; the method is characterized in that the expansion coefficient of the medium is calculated according to the measured medium temperature, and the expansion coefficient is calculated according to the measured medium temperature.
Step 105: according to the determined height increment and the initial oil level height h20An actual oil level height h is determined.
Specifically, the current oil level is at h2Within the corresponding shape, Δ h ═ α [ S ], [1h1+(h20-h1)S2〕(T-20)}/S2，h＝h20+Δh；
The current oil level is at h3Within the corresponding shape, Δ h ═ α [ S ], [1h1+S2h2+(h20-h1-h2)S3〕(T-20)}/S3，h＝h20+Δh；
The current oil level is at h4Within the corresponding shape, Δ h ═ α [ S ], [1h1+S2h2+S3h3+(h20-h1-h2-h3)S4〕(T-20)}/S4，h＝h20+Δh；
The current oil level is at h5Within the corresponding shape, Δ h ═ α [ S ], [1h1+S2h2++S3h3+S4h4+
(h20-h1-h2-h3-h4)S5〕(T-20)}/S5，h＝h20+Δh。
The current oil level is at h6Within the corresponding shape, Δ h ═ α [ S ], [1h1+S2h2++S3h3+S4h4+S5h5+
(h20-h1-h2-h3-h4-h5)S6〕(T-20)}/S6，h＝h20+Δh。
The current oil level is at h7Within the corresponding shape, Δ h ═ α [ S ], [1h1+S2h2++S3h3+S4h4+S5h5+S6h6+(h20-h1-h2-h3-h4-h5-h6)S7〕(T-20)}/S7，h＝h20+Δh。
TABLE 1
TABLE 2
| Temperature (. degree.C.) | Pressure (bar) | Actual oil level (m) | Measuring oil level (m) |
| 20 | 0.023 | 0.300 | 0.295 |
| 20 | 0.055 | 0.714 | 0.710 |
| 20 | 0.062 | 0.800 | 0.797 |
| 30 | 0.062 | 0.805 | 0.797 |
| 40 | 0.062 | 0.809 | 0.797 |
| 50 | 0.062 | 0.813 | 0.797 |
| 60 | 0.062 | 0.818 | 0.797 |
| 70 | 0.062 | 0.822 | 0.797 |
| 80 | 0.062 | 0.829 | 0.797 |
| 90 | 0.062 | 0.837 | 0.797 |
Under the same oil storage equipment and the same conditions, the table 1 is the oil level detection experiment record adopting the oil level detection method, the table 2 is the existing pressure type oil level detection experiment record, and the error of the oil level detection method is 0-0.04 along with the change of the temperature and the actual oil level, while the error of the prior art is larger, and the measurement result is not changed due to the temperature change in the prior art as can be seen from the table 1 and the table 2.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, the terms describing the positional relationships in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, 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 process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (8)
1. An oil level detection method for a light oil storage system is characterized by comprising the following steps:
predetermining an initial oil level h for the medium oil level in an oil storage device at a nominal condition of 20 DEG C20；
Determining the expansion coefficients of the medium corresponding to a plurality of temperature intervals;
according to the initial oil level height h20Determining that the current oil level is at the position of an oil storage device, and determining a height increase amount corresponding to the position of the oil storage device;
determining a corresponding expansion coefficient according to a medium in the oil storage equipment and the current actual temperature of the medium;
according to the determined height increment and the initial oil level height h20An actual oil level height h is determined.
2. Oil level detection method for light oil storage system according to claim 1, wherein the predetermined initial oil level height h of the medium oil level in the oil storage device at a standard condition of 20 ℃20The method specifically comprises the following steps: the density of the medium at 20 ℃ is rho20The bottom pressure is P, and the initial oil level height is h20，h20＝100000P/ρ20g, wherein g is a local gravitational acceleration value.
3. The oil level detection method for the light oil storage system according to claim 1 or 2, wherein the expansion coefficients corresponding to a plurality of temperature intervals of the medium are determined, specifically: uniformly dividing a plurality of temperature intervals between 20 ℃ and 100 ℃, and respectively determining the expansion coefficient of the medium corresponding to each temperature interval.
4. The oil level detection method for a light oil storage system according to claim 3, wherein said oil level is determined according to said initial oil level height h20Determining that the current oil level is at the position of the oil storage device, specifically: height h according to the shape of a section of oil storage equipmentxHeight h from initial oil level20The comparison of (a) determines that the current oil level is at the location of the oil storage device.
5. The oil level detection method for a light oil storage system according to claim 4, wherein the initial oil level height h20Sequentially comparing the oil level with the height interval of each section of upper and lower shapes from the bottom to the top in the oil storage equipment, and if the initial oil level height h20Within the height interval of each section of the upper and lower shapes, determining that the current oil level is within the upper section shape position of each section of the upper and lower shapes, and if the initial oil level height h20Greater than a certain shape of each section up and downThe height interval is continuously judged, namely the height interval of each section of shape at the upper part and the lower part of the next position is continuously judged until the height h of the initial oil level20Within the height interval of each section of shape.
6. The oil level detection method for a light oil storage system according to claim 5, wherein the initial oil level height h is 0 ≦ h20＜h1When the current oil level is determined to be at the height h1The corresponding section of shape; when h is generated1Less than or equal to the height h of the initial oil level20＜h1+h2When the current oil level is determined to be at the height h2The corresponding section of shape; when h is generated1+...+hX-1Less than or equal to the height h of the initial oil level20＜h1+...+hXWhen the current oil level is determined to be at the height hXThe corresponding section of shape; h is1～hxThe height of each segment shape from bottom to top.
7. The oil level detection method for the light oil storage system according to claim 6, wherein the determining of the height increase amount corresponding to the position of the oil storage device is specifically: after determining that the current oil level is at the location of the oil storage device, α [ S ] is determined according to the formula Δ h1h1+...+Sx-1hx-1+(h20-h1-...-hx-1)Sx〕(T-20)/SxDetermining the height increase Δ h, S1～SxIs the cross-sectional area of each segment, h1～hxT is the height of each section shape and is the collected temperature value.
8. The oil level detection method for a light oil storage system according to claim 7, wherein the increase amount of the height according to the determination and an initial oil level height h20Determining the actual oil level height h, specifically: according to the formula h ═ h20+ Δ h determines the actual oil level height h.
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| CN115326172A (en) * | 2022-07-16 | 2022-11-11 | 戴天智能科技（上海）有限公司 | Transformer oil level detection method and system, storage medium and intelligent terminal |
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