CN113720650B - Parasitic transformer oil sampling container, device and method - Google Patents
Parasitic transformer oil sampling container, device and method Download PDFInfo
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- CN113720650B CN113720650B CN202110984851.4A CN202110984851A CN113720650B CN 113720650 B CN113720650 B CN 113720650B CN 202110984851 A CN202110984851 A CN 202110984851A CN 113720650 B CN113720650 B CN 113720650B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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Abstract
The invention discloses a parasitic transformer oil sampling container, a device and a method, wherein the container comprises a shell and a sealing piston; the shell is provided with a connecting pipeline oil inlet, a connecting pipeline oil outlet and a sample releasing port; the sealing piston is attached to the inner wall of the shell; the oil inlet of the connecting pipeline is used for enabling a transformer oil flow pipeline or a transformer oil sample in the transformer to enter the shell through the oil inlet of the connecting pipeline; along with the injection of the transformer oil sample, the transformer oil sample pushes the sealing piston to move along the inner wall of the shell until the oil outlet of the connecting pipe is exposed, and the transformer oil sample in the shell returns to a parasitic transformer oil flow pipeline or a parasitic transformer from the oil outlet of the connecting pipe to form a transformer oil circulation passage; the sample releasing port is used for pushing the sealing piston to move along the inner wall of the shell so as to release the transformer oil sample in the shell. The invention can ensure that the oil sample is from the transformer oil flow pipeline in the circulating state, and also ensures the sealing, dust prevention, shock prevention, light prevention and the like in the whole sampling process.
Description
Technical Field
The invention belongs to the field of electric power, and particularly relates to a parasitic transformer oil sampling container, a device and a method.
Background
The transformer oil is an important component in the transformer, and has three main functions, namely: insulation function-the much higher insulation strength of transformer oil than air can insulate and maintain the transformer winding, and also can prevent the object soaked by the oil from being corroded by moisture; the transformer oil expands and rises under the heat generated by the transformer during operation to form the up-and-down convection of an oil way, so that the heat carried by the transformer oil is conveniently dissipated out through a radiator; and arc extinction effect, namely, the oil immersed switch can generate electric arc when cutting off power load, the high-temperature electric arc can possibly cause equipment to be burnt or cause overvoltage to damage the equipment, and the high-heat-conductivity hydrogen generated by the high-temperature decomposition of the electric arc of the transformer oil can absorb excessive heat and conduct the excessive heat to the oil, thereby achieving the aim of arc extinction. When the quality (such as acid value, moisture content, gas component content in oil, cut-off loss factor and the like) of the transformer oil in operation meets the specified quality standard, the transformer oil can ensure safe and stable operation; if some quality of the transformer oil changes during operation, the insulation property of the insulating oil is affected slightly, and the aging of the oil is accelerated, so that the operation reliability of equipment and the service life of the equipment are affected, for example, the moisture content in the transformer oil is increased; a heavy event may indicate a transformer failure requiring timely maintenance, such as a sustained increase in gas composition in the transformer oil. Therefore, effective detection of various quality indexes of the transformer oil is very important for determining the running state of the transformer.
One of the most important points of effective testing is to ensure the validity of the transformer oil sample, i.e. to ensure that the transformer oil sample can represent the bulk oil. At present, the sampling of transformer oil mainly has two modes: the sampling is carried out manually by a sampling tool (generally used for off-line detection) or directly by a detection instrument with a pipeline connecting transformer (generally used for on-line detection). At present, the quantity of off-line/laboratory detection and on-site detection is far larger than that of on-line detection, so that the sampling mode of manually sampling by a sampling tool has more use cases compared with the sampling mode of sampling by a detection instrument with a pipeline connected transformer, which can only be used for on-line detection. Because the oil flow pipeline formed after the online detection instrument is connected with the transformer is generally in a circulating state, a sample obtained by the detection instrument in a way of connecting the online detection instrument with a pipeline and sampling the transformer generally cannot come from oil at a dead corner with insufficient oil circulation or waste oil and dead oil from a valve port; and the sealing, dustproof, shockproof and lightproof performances of the method are ensured due to the existence of the circulating oil flow pipeline, so that the samples obtained by the method are generally representative, and the obtained oil sample can represent the body oil; in addition, the method has a very high degree of automation, and samples can be taken without human intervention. In contrast to the above, another way, the sample taken by manual sampling by a sampling tool, may be perturbed in its representativeness by a number of factors. According to the requirements of GB/T7597 sampling method for electric oil (transformer oil, turbine oil), a sampling bottle for routine analysis of transformer oil and a sampling injector for analysis of water in oil and dissolved gas in oil are required to be pretreated by cleaning with organic solvent, tap water and distilled water, drying and cooling; secondly, when the transformer oil is subjected to routine analysis and sampling, a sampling transformer valve is wiped clean by using grade-A cotton yarn or gauze, then a sampling oil-resistant pipe is connected, oil is discharged to clean the pipeline, and a sampling bottle can be used for sampling after waste oil is discharged; when the sampling valve injector is used for analyzing and sampling water in transformer oil and dissolved gas in oil, sampling needs to be carried out on a sunny day besides flushing a sampling passage with oil and discharging dead oil of waste oil. Any operation of the above steps is not in place, which may cause contamination of the oil sample by moisture, air, etc. existing in the sampling passage or outside to change the quality of the oil sample, or change the quality of the oil sample due to vibration, light, etc. The change in the quality of the oil sample makes the oil sample different from the bulk oil and thus is not representative. The data measured by the transformer oil sample which loses representativeness cannot correctly reflect various quality indexes of the transformer oil, and the state of the transformer oil and the running condition of the transformer cannot be accurately judged.
Disclosure of Invention
In order to solve the problems, the invention provides a parasitic transformer oil sampling container, a parasitic transformer oil sampling device and a parasitic transformer oil sampling method, which can ensure that an oil sample is from a transformer oil flow pipeline in a circulating state, and can ensure sealing, dust prevention, shock prevention, light prevention and the like in the whole sampling process, so that the obtained sample is representative.
In order to achieve the technical purpose and achieve the technical effects, the invention is realized by the following technical scheme:
in a first aspect, the invention provides a parasitic transformer oil sampling container, comprising a housing and a sealing piston;
the shell is provided with a connecting pipeline oil inlet, a connecting pipeline oil outlet and a sample releasing port;
the sealing piston is attached to the inner wall of the shell;
the connecting pipe oil inlet and the connecting pipe oil outlet are respectively used for being connected with a transformer oil flow pipeline or a transformer oil leading port, so that a transformer oil sample in the transformer oil flow pipeline or the transformer enters the shell through the connecting pipe oil inlet; along with the injection of the transformer oil sample, the transformer oil sample pushes the sealing piston to move along the inner wall of the shell until the connecting pipe oil outlet is exposed, and the transformer oil sample in the shell returns to the parasitic transformer oil flow pipeline or transformer from the connecting pipe oil outlet to form a transformer oil circulation path;
the sample releasing port is used for pushing the sealing piston to move along the inner wall of the shell so as to release the transformer oil sample in the shell.
Optionally, the connection pipe oil inlet, the connection pipe oil outlet and the sample releasing port are sequentially arranged along the axial direction of the shell.
Optionally, the connecting pipeline oil inlet is arranged at one end of the shell; the oil outlet of the connecting pipeline is arranged on the side part of the shell; the sample releasing port is arranged at the other end of the shell.
Optionally, when the sealing piston is located at one end of the sample release port, the sealing piston does not shield the oil outlet of the connection pipeline.
Optionally, locking pieces are arranged at the oil inlet of the connecting pipe and the oil outlet of the connecting pipe; when the locking piece is closed and the sample release opening is shielded by the sealing piston, the shell is in a closed state.
In a second aspect, the invention provides a parasitic transformer oil sampling device, which comprises one or more parasitic transformer oil sampling containers of any one of the first aspects;
when the number of the parasitic transformer oil sampling containers is 1, the parasitic transformer oil sampling containers are directly parasitic on a transformer oil flow pipeline or a transformer oil leading port;
when the number of the parasitic transformer oil sampling containers is more than 1, each parasitic transformer oil sampling container forms a plurality of mutually independent sampling units in a series connection, parallel connection or series-parallel combination connection mode, each sampling unit is respectively parasitic on a transformer oil flow pipeline or a transformer oil leading port, and after one or more sampling units are taken down, transformer oil samples in other sampling units flow smoothly.
Optionally, the oil inlet of the connecting pipe is communicated with an oil flow pipe of the transformer or an oil leading port of the transformer through an oil inlet pipe; the oil outlet of the connecting pipeline is communicated with an oil flow pipeline of the transformer or an oil leading port of the transformer through an oil outlet pipeline.
Optionally, the oil inlet pipeline and the oil outlet pipeline are both connected with the same oil leading port on the transformer, or the oil inlet pipeline and the oil outlet pipeline are respectively connected with different oil leading ports, a pump is installed on the oil inlet pipeline, and the pump leads transformer oil in the oil leading ports of the transformer to be introduced into an oil flow pipeline of the transformer.
Optionally, the oil inlet pipeline and the oil outlet pipeline are respectively connected with different oil guiding ports, the oil guiding port of the transformer connected with the oil inlet pipeline is lower than the oil guiding port of the transformer connected with the oil outlet pipeline, and a heating device is arranged at the position of the oil guiding port of the transformer connected with the oil outlet pipeline.
In a third aspect, the invention provides a sampling method for a parasitic transformer oil sampling device according to any one of the second aspect, which is characterized by comprising the following steps:
when the number of the parasitic transformer oil sampling containers is 1, the selected parasitic transformer oil sampling container is taken down from a transformer oil flow pipeline or a transformer oil leading port, and a transformer oil sample in the transformer oil flow pipeline flows smoothly;
when the number of the parasitic transformer oil sampling containers is larger than 1, each parasitic transformer oil sampling container forms a plurality of sampling units parasitic on a transformer oil flow pipeline or a transformer oil leading port in a series connection, parallel connection or series-parallel connection combined connection mode, one or more selected sampling units are taken down from the transformer oil flow pipeline or the transformer oil leading port, and transformer oil samples in the rest sampling units in the sampling device flow smoothly.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention can ensure that the oil sample is from the transformer oil flow pipeline in the circulation state, and can ensure the sealing, dust prevention, shock prevention, light prevention and the like in the whole sampling process, so that the obtained transformer oil sample is representative necessarily, namely the body oil;
(2) The invention skillfully utilizes the sampling mode of the oil flow pipeline parasitic in the circulation to avoid the waste oil and dead oil emission which is necessary after the oil-proof pipe is connected with the valve port of the transformer when the sampling tool is used for manual sampling, thereby achieving the purposes of energy conservation and emission reduction to some extent;
(3) According to the invention, the operation is only needed when the sampling device is installed to the oil flow pipeline and removed from the oil flow pipeline, and the rest sampling steps do not need to be manually participated, so that the sampling operator does not need to have transformer oil sampling skill, and the preparation time and the operation time of transformer oil sampling can be shortened;
(4) The parasitic transformer oil sampling container can also be used for immediate sampling directly through the transformer sampling port, replaces the function of a sampling injector, and avoids the troublesome operation that the sampling injector needs to be repeatedly flushed by transformer oil when the sampling injector is used.
(5) After the parasitic transformer oil sampling container is taken down after sampling is finished, N can be added into the parasitic transformer oil sampling container 2 And directly vibrated for degassing by a mechanical oscillation method; the automatic oil sample feeding device can also be connected with an automatic sample pushing device, the sealing piston is pressed downwards through the sample releasing port, so that an oil sample is released through the oil outlet of the connecting pipeline, and the automatic oil sample feeding device is used for an automatic degassing device to automatically feed the oil sample.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a parasitic transformer oil sampling method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a parasitic transformer oil sampling method according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a parasitic transformer oil sampling method according to a third embodiment of the present invention;
FIG. 4 (1) is a schematic diagram of a parasitic transformer oil sampling method according to a fourth embodiment of the present invention;
FIG. 4 (2) is a schematic diagram of a parasitic transformer oil sampling method according to a fifth embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a parasitic transformer oil sampling vessel according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating a usage status of a parasitic transformer oil sampling vessel according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a parasitic transformer oil sampling vessel coupled to a transformer oil flow line according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a parasitic transformer oil sampling vessel separated from a connecting transformer oil flow conduit in accordance with an embodiment of the present invention;
FIG. 9 is a second schematic diagram of a parasitic transformer oil sampling vessel according to an embodiment of the present invention;
FIG. 10 (1) is a schematic diagram illustrating a usage state of a parasitic transformer oil sampling container according to an embodiment of the present invention;
FIG. 10 (2) is a second schematic diagram illustrating the usage status of a parasitic transformer oil sampling container according to an embodiment of the present invention;
FIG. 10 (3) is a third schematic diagram illustrating a usage state of a parasitic transformer oil sampling vessel according to an embodiment of the present invention;
the meaning of the individual reference symbols in the figures is as follows:
1: a transformer; 2: detecting an instrument on line; 3: a transformer oil flow conduit; 4: an oil inlet pipeline; 5: an oil outlet pipeline; 6: a sampling device; 7: the sampling devices are connected in series; 8: the sampling devices are connected in parallel; 9: a transformer oil leading port; 10: a pump; 11: a heating device; 12: a housing; 13: a sealing piston; 14: an oil inlet of the connecting pipeline; 15: an oil outlet of the connecting pipeline; 16: a sample releasing port; 17: a parasitic transformer oil sampling vessel; 18: an oil inlet two-way valve of the sampling device; 19: a two-way valve at the oil outlet of the sampling device; 20: a waste oil discharge pipe; 21: a waste oil tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
Example 1
In the embodiment of the present invention, a parasitic transformer oil sampling container 17 is provided, as shown in fig. 5, which includes a housing 12 and a sealing piston 13;
the shell 12 is provided with a pipeline oil inlet 14, a pipeline oil outlet 15 and a sample releasing port 16; the shell 12 has good sealing performance, and the inner wall material does not change any property of the transformer oil;
the sealing piston 13 has good sealing performance, is attached to the inner wall of the shell 12 and can move back and forth along the inner wall of the shell 12;
the connecting pipe oil inlet 14 and the connecting pipe oil outlet 15 are respectively used for being connected with the transformer oil flow pipe 3 or the transformer oil leading port 9, so that a transformer oil sample in the transformer oil flow pipe 3 or the transformer enters the shell 12 through the connecting pipe oil inlet 14; along with the injection of the transformer oil sample, the transformer oil sample pushes the sealing piston 13 to move along the inner wall of the shell 12 until the connecting pipe oil outlet 15 is exposed, and the transformer oil sample in the shell 12 returns to the parasitic transformer oil flow pipe 3 or the transformer from the connecting pipe oil outlet 15 to form a transformer oil circulation path;
the sample release port 16 is used for pushing the sealing piston 13 to move along the inner wall of the housing 12 so as to release the transformer oil sample in the housing 12.
In a specific implementation manner of the embodiment of the present invention, the connection pipe oil inlet 14, the connection pipe oil outlet 15, and the sample release port 16 are sequentially arranged along an axial direction of the housing 12. When the sealing piston 13 is positioned at one end of the sample release opening 16, the sealing piston 13 does not shield the connecting pipeline oil outlet 15. As shown in fig. 5, in particular, the oil inlet 14 is provided at one end of the housing 12; the connecting pipeline oil outlet 15 is arranged on the side part of the shell 12; the sample release port 16 is at the other end of the housing 12.
In a specific implementation manner of the embodiment of the present invention, locking members (not shown) are disposed at the connection pipe oil inlet 14 and the connection pipe oil outlet 15, and when the locking members are closed and the sample release port 16 is blocked by the sealing piston 13, the housing 12 is in a closed state.
As shown in fig. 6, when the parasitic transformer oil sampling container 17 is in a no-sample state, the sealing piston 13 is at the lowest part of the housing 12; the parasitic transformer oil sampling container 17 is connected with the transformer oil flow pipeline 3 through the connecting pipeline oil inlet 14 and the connecting pipeline oil outlet 15 (state 1);
after a transformer oil sample enters the shell 12 from the connecting pipe oil inlet 14, the transformer oil sample pushes the sealing piston 13 up along the inner wall of the shell 12 until the sealing piston 13 is at the highest position in the shell 12 along with the injection of the transformer oil sample; the air originally existing in the shell 12 is discharged out through the sample outlet 16 along with the addition of the transformer oil sample (state 2);
after the transformer oil sample pushes the sealing piston 13 to the highest position in the housing 12, the transformer oil sample in the housing 12 returns to the parasitic transformer oil flow pipeline 3 or transformer from the connecting pipeline oil outlet 15 (state 3); as shown in fig. 7, in this state, the connection pipe oil inlet 14 of the parasitic transformer oil sampling container 17 is connected with the oil inlet pipe 4, and the connection pipe oil outlet 15 is connected with the oil outlet pipe 5; the sampling container 17 is connected with the transformer oil flow pipeline 3 through the oil inlet pipeline 4 and the oil outlet pipeline 5 to form a complete transformer oil circulation passage; the transformer oil in the transformer oil flow pipeline 3 enters the typical parasitic transformer oil sampling container 17 through the oil inlet pipeline 4 and the oil inlet 14 of the connecting pipeline, and returns to the transformer oil flow pipeline 3 through the oil outlet 15 of the connecting pipeline and the oil outlet pipeline 5; in actual use, the transformer oil flow pipeline 3 comprises a self-built transformer oil flow pipeline or an existing transformer oil flow pipeline 3, and the existing transformer oil flow pipeline 3 refers to a transformer oil circulation pipeline (such as a transformer oil sampling pipeline of an online chromatograph) which is in communication with a transformer and exists in an existing device for connecting the transformer, or a transformer oil flow pipeline which exists in the transformer itself; the self-built transformer oil flow pipeline refers to a special transformer oil flow pipeline built for the parasitic transformer oil sampling container 17 of the parasitic transformer oil sampling container.
When the parasitic transformer oil sampling container 17 is removed from the parasitic transformer oil flow pipeline 3 or the parasitic transformer oil leading port 9, the connecting pipeline oil inlet 14 and the connecting pipeline oil outlet 15 are disconnected from the connected oil inlet pipeline 4 and the connected oil outlet pipeline 5, and the connecting pipeline oil inlet 14 and the connecting pipeline oil outlet 15 are closed at the same time, so as to ensure that the shell 12 is always in a closed state (state 4) in the whole process; as shown in fig. 8, when all the connecting pipe oil inlets 14 and the connecting pipe oil outlets 15 are disconnected from the oil inlet pipe 4 and the oil outlet pipe 5, the transformer oil flow pipe 3 parasitic to the parasitic transformer oil sampling container 17 restores the original oil flow path;
the parasitic transformer oil sampling container 17 taken down from the transformer oil flow pipeline 3 or the transformer oil leading port 9 can push the sealing piston 13 downwards through the sample releasing port 16 manually or by connecting an automatic sample pushing device, so that an oil sample enters the detection instrument through the connecting pipeline oil outlet 15 (state 5);
when all the oil samples in the parasitic transformer oil sampling container 17 enter the detection instrument, the sealing piston 13 returns to the bottommost part of the shell 12; the parasitic transformer oil sampling vessel 17 emptied of oil sample can continue to be used for parasitic transformer oil flow line 3 sampling (state 6).
Example 2
In an embodiment of the invention, a parasitic transformer oil sampling apparatus 6 is provided, comprising one or more parasitic transformer oil sampling vessels 17 according to any one of embodiments 1;
when the number of the parasitic transformer oil sampling containers 17 is 1, the parasitic transformer oil sampling containers 17 are directly parasitic on the transformer oil flow pipeline 3;
when the number of the parasitic transformer oil sampling containers 17 is more than 1, each parasitic transformer oil sampling container 17 forms a plurality of mutually independent sampling units in a manner of connecting in series (see 7 in fig. 2), in parallel (see 8 in fig. 2) or in series-parallel combination (see the combination of 7 and 8 in fig. 2), and each sampling unit is respectively parasitic on the transformer oil flow pipeline 3; when a plurality of the sampling vessels 17 are parasitized on the transformer oil flow pipeline 3 in a serial manner, the removed sampling vessels 17 do not affect the internal transformer oil circulation of the sampling vessels 17 remaining parasitized on the transformer oil flow pipeline 3; for example, when one of the sample vessels 17 in the series flow path (see fig. 2-7) of the sample vessels 17 is removed, the series flow path is not interrupted by sampling of one of the sample vessels 17, and instead a line connects the upper and lower sample vessels 17 to allow flow through the series flow path.
The oil inlet 14 of the connecting pipeline is connected with the transformer oil flow pipeline 3 through the oil inlet pipeline 4; the connecting pipe oil outlet 15 is connected with the transformer oil flow pipeline 3 through the oil outlet pipeline 5, and a representative transformer oil sample can be obtained by removing the sampling container 17 when sampling is needed.
As shown in fig. 1, the sampling container 17 is connected to the transformer oil flow pipeline 3 through the oil inlet pipeline 4 and the oil outlet pipeline 5 to realize parasitism (the transformer oil flow pipeline 3 shown in fig. 1 is a circular sampling pipeline for connecting the online detection instrument 2 to the transformer 1 for sampling); the transformer oil in the sampling container 17 flows smoothly, so that the circulation and circulation of the transformer oil in a new transformer oil circulation pipeline formed after the transformer oil is parasitized in the transformer oil flow pipeline 3 are ensured;
when sampling is needed, the connection between the oil inlet pipeline 4 and the oil outlet pipeline 5 and the sampling container 17 is only needed to be disconnected; after the connection is disconnected, the transformer oil flow pipe 3 restores the original oil flow path, so that the removal of the sampling container 17 does not affect the flow of the parasitic transformer oil flow pipe 3.
Example 3
The embodiment of the present invention is different from embodiment 2 in that, as shown in fig. 3:
when the number of the parasitic transformer oil sampling containers 17 is 1, the parasitic transformer oil sampling containers 17 are directly parasitic on the transformer oil leading port 9;
when the number of the parasitic transformer oil sampling containers 17 is greater than 1, each parasitic transformer oil sampling container 17 forms a plurality of mutually independent sampling units in a series connection, parallel connection or series-parallel combination connection mode, and each sampling unit is parasitic on the transformer oil leading port 9; when a plurality of sampling containers 17 are parasitized on the transformer oil leading port 9 in a series connection mode, the taken-down sampling containers 17 do not influence the internal transformer oil circulation of the remaining sampling containers 17 which are parasitized on the transformer oil leading port 9; for example, when one of the sampling vessels 17 in the series passage of sampling vessels 17 is removed, the series passage does not interrupt the passage due to the sampling of one of the sampling vessels 17, and an alternative line is provided to communicate the upper and lower sampling vessels 17 to communicate the series passage.
In a specific implementation manner of the embodiment of the present invention, two ends of the transformer oil flow pipe 3 are respectively connected to different oil introducing ports (see fig. 4 (1)), and the oil inlet pipe 4 is mounted with a pump 10, and the pump 10 introduces the transformer oil in the transformer oil introducing port 9 into the transformer oil flow pipe 3.
In another embodiment of the present invention, the oil inlet pipe 4 and the oil outlet pipe 5 are both connected to the same oil drawing port on the transformer (see fig. 3), and the transformer oil in the transformer oil drawing port 9 is introduced into the transformer oil flow pipe 3 by a pump 10 installed on the oil inlet pipe 4.
Example 4
The embodiment of the present invention is different from embodiment 3 in that: as shown in fig. 4 (2), when different transformer oil inlets 9 are selected as the connection ports of the transformer oil flow pipeline 3, the manner of heating the transformer oil in the pipeline can be selected, so as to ensure the circulation and circulation of the transformer oil in the transformer oil flow pipeline;
as shown in fig. 4 (2), when the mode of using the transformer oil in the heating pipeline is selected, the transformer oil inlet 9 connected to the oil inlet pipeline 4 is located at a position lower than the transformer oil inlet 9 connected to the oil outlet pipeline 5; and a heating device 11 is arranged at the position of the transformer oil leading port 9 connected with the oil outlet pipeline 5.
When sampling is needed, the connection between the oil inlet pipeline 4 and the oil outlet pipeline 5 and the sampling container 17 is only needed to be disconnected; when the sampling container 17 is removed from the transformer oil flow pipe 3, the flow pipe is interrupted, and the transformer oil in the pipe stops flowing.
Example 5
The embodiment of the invention provides a sampling method based on the parasitic transformer oil sampling device in any one of embodiment 2, which comprises the following steps:
when the number of the parasitic transformer oil sampling containers 17 is 1, the selected parasitic transformer oil sampling container 17 is taken down from the transformer oil flow pipeline 3 or the transformer oil leading port 9, and the transformer oil sample in the transformer oil flow pipeline 3 flows smoothly;
when the number of the parasitic transformer oil sampling containers 17 is larger than 1, each parasitic transformer oil sampling container 17 forms a plurality of sampling units in a series, parallel or series and parallel combined connection mode to be parasitic on the transformer oil leading port 9 of the transformer oil flow pipeline 3, one or more selected sampling units are taken down from the transformer oil leading port 9 of the transformer oil flow pipeline 3, and transformer oil samples in the rest sampling units in the sampling device flow smoothly.
Example 6
In the embodiment of the present invention, a parasitic transformer oil sampling container 17 is provided, which is different from embodiment 1 in that, as shown in fig. 9:
a locking piece arranged at the oil inlet 14 of the connecting pipeline is a sampling device oil inlet two-way valve 18; the locking piece arranged at the oil outlet 15 of the connecting pipeline is a two-way valve 19 of the oil outlet of the sampling device; and as shown in fig. 10, the parasitic transformer oil sampling vessel 17 may be used to take a transformer oil sample on-the-fly. When the parasitic transformer oil sampling container 17 is used for immediate sampling and first-step sampling, as shown in fig. 10 (1), the parasitic transformer oil sampling container 17 is connected with one end of the oil inlet pipeline 4 through the two-way valve 18 for the oil inlet of the sampling device, and the other end of the oil inlet pipeline 4 is connected with the oil guide port 9 of the transformer 1 to establish sampling of a transformer oil sampling passage. When the connection of the path is completed, the two-way valve 18 of the oil inlet of the sampling device is opened, and the transformer oil sample is conveyed into the parasitic transformer oil sampling container 17 due to the pressure difference between the transformer and the sampling device.
When dead oil from the waste oil at the oil guide port is discharged in the second step, as shown in fig. 10 (2), the two-way valve 19 at the oil outlet of the sampling device is connected to the waste oil discharge pipeline 20, and when the housing 12 is filled with the oil sample entering the parasitic transformer oil sampling device 17, the sealing piston 13 in the housing 12 is positioned at one end of the sample release port 16, and the oil outlet 15 is exposed. The two-way valve 19 of the oil outlet of the sampling device is opened, the waste oil and dead oil reserved in the oil leading port 9 firstly flow into the shell 12 of the parasitic transformer oil sampling container 17, and then when the two-way valve 19 of the oil outlet of the sampling device is opened, the two-way valve 19 of the sampling device and the waste oil discharge pipeline 20 flow into the waste oil barrel 21 through the oil outlet 15.
When the sampling is completed in the third step, as shown in fig. 10 (3), firstly, after the waste oil and the dead oil flow out and run off from the parasitic transformer oil sampling device 17, the two-way valve 19 at the oil outlet of the sampling device is closed. In this case, the transformer oil sample stored in the parasitic transformer oil sampling device 17 is a representative oil sample. And then closing the two-way valve 18 of the oil inlet of the sampling device, so that the parasitic transformer oil sampling device 17 is in a closed state. And disconnecting the oil inlet pipeline from the two-way valve 18 of the oil inlet of the sampling device, so that the parasitic transformer oil sampling device 17 can be taken down to finish sampling. The parasitic transformer oil sampling device can then be used directly in mechanical oscillation for degassing; can also be connected with an automatic sample pushing device and used for an automatic degasser to automatically feed oil samples.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A parasitic transformer oil sampling container which characterized in that: comprises a shell and a sealing piston;
the shell is provided with a connecting pipeline oil inlet, a connecting pipeline oil outlet and a sample releasing port;
the sealing piston is attached to the inner wall of the shell;
the connecting pipe oil inlet and the connecting pipe oil outlet are respectively used for being connected with a transformer oil flow pipeline or a transformer oil leading port, so that a transformer oil sample in the transformer oil flow pipeline or the transformer enters the shell through the connecting pipe oil inlet; along with the injection of the transformer oil sample, the transformer oil sample pushes the sealing piston to move along the inner wall of the shell until the connecting pipe oil outlet is exposed, and the transformer oil sample in the shell returns to the parasitic transformer oil flow pipe or transformer from the connecting pipe oil outlet to form a transformer oil circulation path;
the sample releasing port is used for pushing the sealing piston to move along the inner wall of the shell so as to release the transformer oil sample in the shell;
the connecting pipeline oil inlet, the connecting pipeline oil outlet and the sample releasing port are sequentially arranged along the axial direction of the shell;
when the parasitic transformer oil sampling container is in a no-sample state, the sealing piston is positioned at the bottommost part of the shell; after a transformer oil sample enters the shell from the oil inlet of the connecting pipeline, the transformer oil sample pushes the sealing piston to be high along the inner wall of the shell along with the injection of the transformer oil sample until the sealing piston is at the highest position in the shell; the air originally existing in the shell can be discharged out through the sample releasing port along with the addition of the transformer oil sample;
when the parasitic transformer oil sampling container is detached from a parasitic transformer oil flow pipeline or a parasitic transformer oil leading port of the parasitic transformer oil sampling container, the connecting pipeline oil inlet and the connecting pipeline oil outlet are disconnected with an oil inlet pipeline and an oil outlet pipeline which are connected with the parasitic transformer oil flow pipeline or the parasitic transformer oil leading port, meanwhile, the connecting pipeline oil inlet and the connecting pipeline oil outlet are closed, and the shell is in a closed state all the time;
parasitic transformer oilAfter the sampling container is taken off, N is added into the sampling container 2 And directly shaking, and degassing by mechanical shaking method.
2. The parasitic transformer oil sampling vessel of claim 1, wherein: the oil inlet of the connecting pipeline is arranged at one end of the shell; the oil outlet of the connecting pipeline is arranged on the side part of the shell; the sample releasing port is arranged at the other end of the shell.
3. The parasitic transformer oil sampling vessel of claim 1, wherein: when the sealing piston is positioned at one end of the sample releasing port, the sealing piston does not shield the oil outlet of the connecting pipeline.
4. The parasitic transformer oil sampling vessel of claim 1, wherein: locking parts are arranged at the oil inlet of the connecting pipe and the oil outlet of the connecting pipe; when the locking piece is closed and the sample release opening is shielded by the sealing piston, the shell is in a closed state.
5. The utility model provides a parasitic transformer oil sampling device which characterized in that: comprising one or more parasitic transformer oil sampling vessels of any one of claims 1-4;
when the number of the parasitic transformer oil sampling containers is 1, the parasitic transformer oil sampling containers are directly parasitic on a transformer oil flow pipeline or a transformer oil leading port;
when the number of the parasitic transformer oil sampling containers is more than 1, each parasitic transformer oil sampling container forms a plurality of mutually independent sampling units in a series connection, parallel connection or series-parallel combination connection mode, each sampling unit is respectively parasitic on a transformer oil flow pipeline or a transformer oil leading port, and after one or more sampling units are taken down, transformer oil samples in other sampling units flow smoothly.
6. The parasitic transformer oil sampling device of claim 5, wherein: the oil inlet of the connecting pipeline is communicated with an oil flow pipeline of the transformer or an oil leading port of the transformer through an oil inlet pipeline; the oil outlet of the connecting pipeline is communicated with an oil flow pipeline of the transformer or an oil leading port of the transformer through an oil outlet pipeline.
7. The parasitic transformer oil sampling device of claim 6, wherein: the oil inlet pipeline and the oil outlet pipeline are connected with the same oil leading port on the transformer, or the oil inlet pipeline and the oil outlet pipeline are respectively connected with different oil leading ports, a pump is installed on the oil inlet pipeline, and the pump leads transformer oil in the oil leading ports of the transformer to be introduced into the transformer oil flow pipeline.
8. The parasitic transformer oil sampling device of claim 6, wherein: the oil inlet pipeline and the oil outlet pipeline are respectively connected with different oil leading ports, the oil leading port of the transformer connected with the oil inlet pipeline is lower than the oil leading port of the transformer connected with the oil outlet pipeline, and a heating device is arranged at the position of the oil leading port of the transformer connected with the oil outlet pipeline.
9. A sampling method based on the parasitic transformer oil sampling device of any one of claims 5-8, characterized by comprising the following steps:
when the number of the parasitic transformer oil sampling containers is 1, taking down the selected parasitic transformer oil sampling container from the transformer oil flow pipeline or the transformer oil leading port, and ensuring that the transformer oil sample in the transformer oil flow pipeline flows smoothly;
when the number of the parasitic transformer oil sampling containers is larger than 1, each parasitic transformer oil sampling container forms a plurality of sampling units in a series connection, parallel connection or series-parallel combination connection mode to be parasitic on a transformer oil flow pipeline or a transformer oil leading port, one or more selected sampling units are taken down from the transformer oil flow pipeline or the transformer oil leading port, and transformer oil samples in the rest sampling units in the sampling device flow smoothly.
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| GB2262277B (en) * | 1991-11-12 | 1994-09-14 | Mobil Oil Ltd | An automated oil sampling apparatus |
| US9255862B2 (en) * | 2013-01-31 | 2016-02-09 | Welker, Inc. | Gasoline blend spot sampling system and method |
| CN203275127U (en) * | 2013-05-23 | 2013-11-06 | 国家电网公司 | Oil extraction device for transformer |
| DE102019135704A1 (en) * | 2019-12-23 | 2021-06-24 | SGS Germany GmbH | Sampling device for the safe extraction of fluids |
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