CN115014868B - Single-port oil extraction system and method for online monitoring of transformer oil - Google Patents
Single-port oil extraction system and method for online monitoring of transformer oil Download PDFInfo
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- CN115014868B CN115014868B CN202210484595.7A CN202210484595A CN115014868B CN 115014868 B CN115014868 B CN 115014868B CN 202210484595 A CN202210484595 A CN 202210484595A CN 115014868 B CN115014868 B CN 115014868B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 79
- 238000000605 extraction Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title abstract description 16
- 238000004891 communication Methods 0.000 claims description 5
- 125000004122 cyclic group Chemical group 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 239000003921 oil Substances 0.000 abstract description 307
- 239000010724 circulating oil Substances 0.000 abstract description 5
- 239000000523 sample Substances 0.000 description 58
- 238000012806 monitoring device Methods 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000009534 blood test Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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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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Abstract
The invention discloses a transformer oil on-line monitoring single-port oil extraction system and a method, wherein the system comprises a pipeline conduction device, a first pipeline, an oil storage cylinder, a second pipeline, a third pipeline and an exhaust device; one end of the first pipeline is connected with a first port of the pipeline conduction device through a first pipeline on-off control device; the oil storage cylinder comprises a first cavity and a second cavity, the volumes of which are adjustable and are in reverse change relation; one end of the second pipeline is connected with the second port of the pipeline conduction device through the second pipeline on-off control device, and the other end of the second pipeline is communicated with the first cavity; one end of the third pipeline is connected with a third port of the pipeline conduction device through a third pipeline on-off control device, and the other end of the third pipeline is used for oil discharge; one end of the exhaust device is communicated with the first cavity through a fourth pipeline on-off control device, and the other end of the exhaust device is used for exhausting. The invention can realize single-port circulating oil extraction, ensure the representativeness of the oil sample in the transformer body, and not cause excessive consumption of the oil sample in the transformer body.
Description
Technical Field
The invention belongs to the field of oil on-line monitoring, in particular to a single-port oil taking system and method for on-line monitoring of transformer oil, and more particularly relates to a circulating oil taking device and method capable of achieving on-line monitoring oil taking and oil return of transformer oil through a single port.
Background
The transformer is core equipment of a power grid, insulating oil (also called as transformer oil) is equivalent to blood of the transformer, on-line monitoring of the transformer oil in a non-power-off state is equivalent to blood test of the equipment, and latent defects such as internal discharge, overheating and the like of the transformer can be found in time. The existing transformer oil online monitoring device is widely installed as an online monitoring device for analyzing dissolved gas in transformer oil, is used for analyzing characteristic gas components in the transformer oil, and is used for 100% installation of the online monitoring device for the dissolved gas in the transformer oil for transformers of 220kV and above by taking national network company as an example. Because the on-line monitoring device is always installed beside the transformer to perform detection at regular time (for example, once in 4 hours), if the oil sample is obtained and is discharged directly, the excessive oil sample in the transformer body can be consumed after the oil sample is washed and detected for a long time by at least 100mL each time, so that when the on-line monitoring device is connected with the transformer, two ports need to be opened, one port is an oil drain port, oil in the transformer enters the on-line monitoring device through the oil drain port, and the other port is an oil return port, namely, the oil passing through the on-line monitoring device and a pipeline returns to the transformer again, and circulation of an oil way is realized. The mode of opening two mouthfuls needs to punch more on the transformer body, has increased the potential risk of transformer body.
Disclosure of Invention
Aiming at the problems, the invention provides the system and the method for online monitoring the single-port oil extraction of the transformer oil, which can realize single-port circulating oil extraction, ensure the representativeness of the oil sample in the transformer body and avoid excessive consumption of the oil sample in the transformer body.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
in a first aspect, the invention provides an online monitoring single-port oil extraction system for transformer oil, comprising:
a pipeline conduction device;
one end of the first pipeline is connected with a first port of the pipeline conduction device through a first pipeline on-off control device, and the other end of the first pipeline is used for being connected with transformer oil;
the oil storage cylinder comprises a first cavity and a second cavity, the volumes of which are adjustable and are in reverse change relation;
one end of the second pipeline is connected with the second port of the pipeline conduction device through a second pipeline on-off control device, and the other end of the second pipeline is communicated with the first cavity;
one end of the third pipeline is connected with a third port of the pipeline conduction device through a third pipeline on-off control device, and the other end of the third pipeline is used for oil discharge;
and one end of the exhaust device is communicated with the first cavity through a fourth pipeline on-off control device, and the other end of the exhaust device is used for exhausting.
Optionally, when the first pipeline on-off control device and the second pipeline on-off control device are opened, and the third pipeline on-off control device is closed, the pipeline on-off control device is communicated with an oil drain valve and an oil storage cylinder connected with the transformer, adjusts the volume of the first cavity to be in a maximum state, and is matched with the exhaust device to exhaust gas possibly existing in the oil storage cylinder and each pipeline.
Optionally, the other end of the third pipeline is connected with an oil on-line monitoring and analyzing unit;
when the first pipeline on-off control device and the third pipeline on-off control device are opened and the second pipeline on-off control device is closed, the pipeline on-off device is communicated with an oil drain valve and an oil on-line monitoring and analyzing unit which are connected with the transformer;
when the first pipeline on-off control device is closed and the second pipeline on-off control device and the third pipeline on-off control device are opened, the pipeline on-off device is communicated with an oil on-line monitoring and analyzing unit and a storage cylinder;
when the first pipeline on-off control device and the oil drain valve connected with the transformer are opened, and the third pipeline on-off control device is closed, the volume of the first cavity is adjusted to be 0, and an oil sample in the oil storage cylinder is pushed back to the transformer body again, so that the cyclic oil extraction and oil return are completed.
Optionally, a piston attached to the inner wall of the oil storage cylinder is arranged in the oil storage cylinder, and the piston divides the inner cavity of the oil storage cylinder into a first cavity and a second cavity;
the piston is also connected with a piston rod, and the other end of the piston rod passes through the second cavity of the oil storage cylinder and is positioned outside the oil storage cylinder.
Optionally, the first pipeline on-off control device, the second pipeline on-off control device, the third pipeline on-off control device and/or the fourth pipeline on-off control device are valves.
Optionally, the pipeline conducting device is a three-way interface.
Optionally, the transformer oil on-line monitoring single-port oil extraction system further comprises a driving piece, wherein the driving piece is positioned outside the oil storage cylinder and connected with the piston rod.
Optionally, the volume of the oil storage cylinder is more than 2 times of the total volume of the oil sample which can be carried in all pipelines between the oil drain valve connected with the oil outlet of the transformer and the oil storage cylinder.
In a second aspect, the invention provides an oil extraction method based on the online monitoring single-port circulation oil extraction system of transformer oil in the first aspect, comprising the following steps:
controlling the on-off state of each pipeline and the exhaust device so that the gas possibly existing in the oil storage cylinder and the pipelines is exhausted;
the on-off state of each pipeline and an oil drain valve connected with the transformer are controlled, so that the oil drain valve and the pipelines are fully flushed by an oil sample in the transformer body; the oil drain valve is communicated with the first pipeline on-off control device;
and controlling the first pipeline and the third pipeline to be in a communication state, and controlling the second pipeline to be in a closing state to finish oil extraction.
Optionally, a piston attached to the inner wall of the oil storage cylinder is arranged in the oil storage cylinder, and the piston divides the inner cavity of the oil storage cylinder into a first cavity and a second cavity; the piston is also connected with a piston rod, and the other end of the piston rod passes through the second cavity of the oil storage cylinder and then is positioned outside the oil storage cylinder
The control of the on-off state of each pipeline and the exhaust device, so that the gas possibly existing in the oil storage cylinder and the pipeline is exhausted, comprises the following steps:
opening the first pipeline on-off control device, the second pipeline on-off control device and the third pipeline on-off control device, closing the fourth pipeline on-off control device, and pulling the piston by utilizing the piston rod to ensure that the volume of the first cavity is maximum;
and closing the first pipeline on-off control device, the second pipeline on-off control device and the third pipeline on-off control device, opening the fourth pipeline on-off control device, pushing the piston by utilizing the piston rod, so that the volume of the second cavity is maximum, and discharging possible gas in the oil storage cylinder and the pipeline.
Optionally, the on-off state of each pipeline of control and the oil drain valve that links to each other with the transformer for oil drain valve and pipeline are fully washed by the interior oil sample of transformer body, include:
the first pipeline on-off control device, the second pipeline on-off control device and the oil drain valve communicated with the transformer are opened, the fourth pipeline on-off control device is closed, and an oil sample in the transformer body enters the oil storage cylinder through the pipeline on-off control device, so that the oil drain valve and the pipeline are fully flushed by the oil sample in the transformer body.
Optionally, the oil extraction method further comprises:
the state of each pipeline on-off control device is controlled, so that the oil sample in the transformer body enters the oil on-line monitoring and analyzing unit through the pipeline on-off control device, and the oil on-line monitoring and analyzing unit can fully represent the oil sample in the transformer body to start analysis.
Optionally, the state of each pipeline on-off control device is controlled, so that an oil sample in the transformer body enters the oil on-line monitoring and analyzing unit through the pipeline on-off device, and the method comprises the following steps:
closing the second pipeline on-off control device and the fourth pipeline on-off control device, opening the first pipeline on-off control device and the third pipeline on-off control device, and an oil drain valve communicated with the transformer, wherein an oil sample in the transformer body enters an oil on-line monitoring and analyzing unit through a pipeline on-off device, and the oil on-line monitoring and analyzing unit can fully represent the oil sample in the transformer body to start analysis.
Optionally, the oil extraction method further comprises: if the oil on-line monitoring and analyzing unit does not damage the analyzed oil sample, after the oil on-line monitoring and analyzing is completed, the second pipeline on-off control device and the third pipeline on-off control device are opened, the volume of the first cavity is adjusted to be maximum, and the oil sample in the oil on-line monitoring and analyzing unit is extracted into the oil storage cylinder.
Optionally, the oil extraction method further comprises: and opening the first pipeline on-off control device and an oil drain valve connected with the transformer, closing the third pipeline on-off control device, adjusting the volume of the first cavity to be 0, pushing the oil sample in the oil storage cylinder back to the transformer body again, and completing the cyclic oil extraction and oil return.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention realizes oil sampling, oil return and circulation of the oil sample in the transformer body by a single port, does not need to additionally arrange an oil hole on the shell of the transformer equipment, and can directly utilize an oil drain valve communicated with the transformer.
(2) The invention can fully flush the pipeline to ensure the representativeness of the oil sample taken by the on-line monitoring device, and can not excessively consume the oil sample in the transformer body.
(3) The invention has no external discharge of oil sample in the whole process of carrying out on-line monitoring, and does not cause extra operation and maintenance burden to first-line operators.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings, in which:
FIG. 1 is a schematic diagram of an online monitoring single-port oil extraction system for transformer oil according to an embodiment of the invention;
wherein: the device comprises a 1-transformer, a 2-oil drain valve, a 3-first pipeline on-off control device, a 4-second pipeline on-off control device, a 5-third pipeline on-off control device, a 6-fourth pipeline on-off control device, a 7-pipeline on-off device, an 8-oil storage cylinder, a 9-piston, a 10-piston rod, an 11-power pump, a 12-exhaust port and a 13-oil on-line monitoring and analyzing unit.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the invention.
In the description of the present patent, it should be noted that, the terms "upper", "lower", "left", "right", "horizontal", etc. indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, and are merely for convenience of describing the present patent and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present patent.
In the description of the present patent, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The principle of application of the invention is described in detail below with reference to the accompanying drawings.
Example 1
Because the two-port opening mode in the prior art needs to be provided with a plurality of holes in the transformer body, the potential risk of the transformer body is increased. Therefore, the embodiment of the invention provides the transformer oil on-line monitoring single-port oil extraction system, which can realize oil circuit circulation through one port, and can directly use the oil drain valve arranged on the transformer body without the need of redundant oil holes.
Specifically, in an embodiment of the present invention, an online monitoring single-port oil extraction system for transformer oil is provided, as shown in fig. 1, including: the pipeline connecting device 7, a first pipeline, an oil storage cylinder 8, a second pipeline, a third pipeline and an exhaust device;
one end of the first pipeline is connected with a first port of the pipeline conduction device 7 through the first pipeline on-off control device 3, and the other end of the first pipeline is used for being connected with transformer oil; in the actual application process, the first pipeline on-off control device 3 is arranged to be communicated with the oil drain valve 2 communicated with the oil outlet of the transformer 1;
the oil storage cylinder 8 comprises a first cavity and a second cavity, the volumes of the first cavity and the second cavity are adjustable, and the volumes of the first cavity and the second cavity are in a reverse change relation, namely if the volume of the first cavity is increased, the volume of the second cavity is decreased, and the fluctuation range is consistent;
one end of the second pipeline is connected with the second port of the pipeline conduction device 7 through the second pipeline on-off control device 4, and the other end of the second pipeline is communicated with the first cavity;
one end of the third pipeline is connected with a third port of the pipeline conduction device 7 through a third pipeline on-off control device 5, and the other end of the third pipeline is used for discharging oil to realize oil extraction;
one end of the exhaust device is communicated with the first cavity through a fourth pipeline on-off control device 6, and the other end of the exhaust device is used for exhausting; when the first pipeline on-off control device 3 and the second pipeline on-off control device 4 are opened and the third pipeline on-off control device 5 is closed, the pipeline on-off device 7 is communicated with the oil drain valve 2 and the oil storage cylinder 8 which are connected with the transformer 1, and the exhaust device is matched to realize the discharge of the oil storage cylinder and the gas possibly existing in each pipeline; in a specific implementation process, the exhaust device is an exhaust port 12;
based on the above description, it can be seen that the working process of the transformer oil online monitoring single-port oil extraction system in the embodiment of the invention is as follows:
the on-off state of each pipeline and the exhaust device is controlled, so that the oil storage cylinder 8 and the gas possibly existing in the pipelines are exhausted;
the on-off state of each pipeline and the oil drain valve 2 connected with the transformer 1 are controlled, so that the oil drain valve 2 and the pipelines are fully flushed by an oil sample in the transformer body; the oil drain valve 2 is communicated with the first pipeline on-off control device 3;
and controlling the first pipeline and the third pipeline to be in a communication state, and controlling the second pipeline to be in a closing state to finish oil extraction.
In a specific implementation manner of the embodiment of the present invention, the first pipeline on-off control device 3, the second pipeline on-off control device 4, the third pipeline on-off control device 5 and/or the fourth pipeline on-off control device 6 may be valves. Preferably, in order to facilitate accurate control of each link of oil extraction, the first pipeline on-off control device 3, the second pipeline on-off control device 4, the third pipeline on-off control device 5 and/or the fourth pipeline on-off control device 6 may be electromagnetic valves. The pipeline conduction device 7 can be a three-way interface, and is low in cost, simple to install and convenient to operate.
In a specific implementation manner of the embodiment of the present invention, the volume of the oil storage cylinder 8 is more than 2 times of the total volume of the oil samples that can be carried in all the pipelines between the oil drain valve 2 connected with the oil outlet of the transformer 1 and the oil storage cylinder 8, so that on one hand, the pipeline is guaranteed to be sufficiently cleaned, on the other hand, the oil samples analyzed by the oil on-line monitoring unit are guaranteed to be "fresh" oil samples in the body of the transformer 11, but not oil samples in the pipeline, and in general, the volume of the oil storage cylinder 8 can be set to be about 2L.
In a specific implementation manner of the embodiment of the invention, a piston 9 attached to the inner wall of the oil storage cylinder 8 is arranged in the oil storage cylinder 8, and the piston 9 divides the inner cavity of the oil storage cylinder 8 into a first cavity and a second cavity; the piston 9 is also connected with a piston rod 10, and the other end of the piston rod 10 passes through the second cavity of the oil storage cylinder 8 and is positioned outside the oil storage cylinder 8. In the specific implementation process, the piston 9 and the piston rod 10 are connected into a whole, so that good sealing performance of the piston 9 in the oil storage cylinder 8 is ensured, and oil leakage is avoided. The piston 9 is driven by the piston rod 10 to reciprocate, as shown in fig. 1, the piston 9 is driven by the piston rod 10 to move up and down, and when the piston rod 10 pulls the piston 9 to move down, oil (gas) in a pipeline can be pumped into the oil storage cylinder 8; when the piston rod 10 pushes the piston 9 upward, the oil (gas) in the reserve tube 8 can be pushed out. In the embodiment of the present invention, the piston 9 and the piston rod 10 may be pushed downward by the transformer oil after the transformer oil enters, and in addition, in a specific implementation manner of the embodiment of the present invention, the transformer oil online monitoring single-port oil extraction system further includes a driving member, where the driving member is located outside the oil storage cylinder 8 and connected to the piston rod 10. In the implementation process, the driving piece can be a power pump 11 or a manual driving piece, and the driving piece is specifically set according to actual situations.
In a specific implementation manner of the embodiment of the present invention, the other end of the third pipeline is connected with an oil on-line monitoring and analyzing unit 13; when the first pipeline on-off control device 3 and the third pipeline on-off control device 5 are opened and the second pipeline on-off control device 4 is closed, the pipeline on-off device 7 is communicated with the oil drain valve 2 and the oil on-line monitoring and analyzing unit 13 which are connected with the transformer 1, so that an oil sample in the transformer body is sent to the oil on-line monitoring and analyzing unit 13 for analysis; when the first pipeline on-off control device 3 is closed, the second pipeline on-off control device 4 and the third pipeline on-off control device 5 are opened, the pipeline on-off device 7 is communicated with the oil on-line monitoring and analyzing unit 13 and the oil storage cylinder 8, after analysis is completed, oil samples in the oil on-line monitoring and analyzing unit 13 are extracted into the oil storage cylinder 8, then the first pipeline on-off control device 3 and the oil drain valve 2 are opened, the first cavity volume is adjusted to be 0, the oil samples in the oil storage cylinder are pushed back to the transformer body again, and circulation oil extraction and oil return are completed. Namely, the piston rod 10 is pushed upwards, the piston 9 is pushed to the top of the oil storage cylinder 8, the oil sample in the oil storage cylinder 8 is pushed back to the transformer body again, and the cyclic oil taking and oil return are completed.
Therefore, the transformer oil on-line monitoring single-port oil extraction system provided by the embodiment of the invention can realize single-port circulating oil extraction, ensure the representativeness of the oil sample in the extracted transformer body, and avoid excessive consumption of the oil sample in the transformer body.
The working principle of the transformer oil on-line monitoring single-port oil extraction system in the embodiment of the invention is described in detail below with reference to a specific implementation manner, in the implementation manner, the first pipeline on-off control device 3, the second pipeline on-off control device 4, the third pipeline on-off control device 5 and the fourth pipeline on-off control device 6 are respectively marked as a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve, and the pipeline on-off control device 7 is a three-way interface. The working process of the transformer oil on-line monitoring single-port oil extraction system comprises the following steps of:
(1) Opening the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, closing the fourth electromagnetic valve, pulling the piston 9 to the bottom of the oil storage cylinder 8 by using the piston rod 10, closing the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, opening the fourth electromagnetic valve, pushing the piston 9 to the top of the oil storage cylinder 8 by using the piston rod 10, discharging possible gas in the oil storage cylinder 8 and a pipeline from the exhaust port 12, and closing the fourth electromagnetic valve;
(2) Opening the first electromagnetic valve and the second electromagnetic valve, opening an oil drain valve 2 connected with the transformer 1, enabling a transformer oil sample to enter a storage cylinder 8 through a three-way interface, and closing the second electromagnetic valve after the oil drain valve 2 and a pipeline connected with the transformer 1 are fully flushed by the oil sample in the transformer body;
(3) Opening a third electromagnetic valve, enabling the oil sample in the transformer body to enter an oil on-line monitoring and analyzing unit 13 through a three-way interface, enabling the oil on-line monitoring and analyzing unit 13 to fully represent the oil sample in the transformer body to start analysis, and closing an oil drain valve 2, a first electromagnetic valve and a third electromagnetic valve which are connected with the transformer 1;
(4) If the oil on-line monitoring and analyzing unit 13 does not damage the analyzed oil sample (the oil sample does not change), opening the electromagnetic valve II and the electromagnetic valve III after the oil on-line monitoring and analyzing is finished, pulling the piston rod 10 downwards to extract the oil sample in the oil on-line monitoring and analyzing unit 13 into the oil storage cylinder 8, stopping pulling the piston rod 10 and closing the electromagnetic valve III;
(5) Opening the first electromagnetic valve and the oil drain valve 2 connected with the transformer 1, pushing the piston rod 10 upwards, pushing the piston 9 to the top of the oil storage cylinder 8, pushing the oil sample in the oil storage cylinder 8 back to the transformer body again, and closing the oil drain valve 2, the first electromagnetic valve and the second electromagnetic valve connected with the transformer 1;
(6) And (3) repeating the steps (2) to (6) when the oil sample taking analysis is needed by the on-line oil monitoring analysis unit 13.
Example 2
The invention provides an oil extraction method based on the online monitoring single-port circulating oil extraction device of transformer oil in embodiment 1, which comprises the following steps:
the on-off state of each pipeline and the exhaust device is controlled, so that the oil storage cylinder 8 and the gas possibly existing in the pipelines are exhausted;
the on-off state of each pipeline and the oil drain valve 2 connected with the transformer 1 are controlled, so that the oil drain valve 2 and the pipelines are fully flushed by an oil sample in the transformer body; the oil drain valve 2 is communicated with the first pipeline on-off control device 3;
and controlling the first pipeline and the third pipeline to be in a communication state, and controlling the second pipeline to be in a closing state to finish oil extraction.
In a specific implementation manner of the embodiment of the invention, a piston 9 attached to the inner wall of the oil storage cylinder 8 is arranged in the oil storage cylinder 8, and the piston 9 divides the inner cavity of the oil storage cylinder 8 into a first cavity and a second cavity; the piston 9 is also connected with a piston rod 10, and the other end of the piston rod 10 passes through the second cavity of the oil storage cylinder 8 and is positioned outside the oil storage cylinder 8
The control of the on-off state of each pipeline and the exhaust device, so that the oil storage cylinder 8 and the gas possibly existing in the pipelines are exhausted, comprises:
the first pipeline on-off control device 3, the second pipeline on-off control device 4 and the third pipeline on-off control device 5 are opened, the fourth pipeline on-off control device 6 is closed, and the piston 9 is pulled by the piston rod 10, so that the volume of the first cavity is maximum;
the first pipeline on-off control device 3, the second pipeline on-off control device 4 and the third pipeline on-off control device 5 are closed, the fourth pipeline on-off control device 6 is opened, the piston 9 is pushed by the piston rod 10, the volume of the second cavity is maximized, and gas possibly existing in the oil storage cylinder 8 and the pipeline is discharged.
In a specific implementation manner of the embodiment of the present invention, the controlling the on-off state of each pipeline and the oil drain valve 2 connected to the transformer 1, so that the oil drain valve 2 and the pipeline are fully flushed by the oil sample in the transformer body, includes:
the first pipeline on-off control device 3, the second pipeline on-off control device 4 and the oil drain valve 2 communicated with the transformer 1 are opened, the fourth pipeline on-off control device 6 is closed, and an oil sample in the transformer body enters the oil storage cylinder 8 through the pipeline on-off control device 7, so that the oil drain valve 2 and the pipeline are fully flushed by the oil sample in the transformer body.
In a specific implementation manner of the embodiment of the present invention, the oil extraction method further includes:
the state of each pipeline on-off control device is controlled, so that the oil sample in the transformer body enters the oil on-line monitoring and analyzing unit 13 through the pipeline conduction device 7, and the oil on-line monitoring and analyzing unit 13 can fully represent the oil sample in the transformer body to start analysis. The method specifically comprises the following steps:
the second pipeline on-off control device 4 and the fourth pipeline on-off control device 6 are closed, the first pipeline on-off control device 3, the third pipeline on-off control device 5 and the oil drain valve 2 communicated with the transformer 1 are opened, an oil sample in the transformer body enters the oil on-line monitoring and analyzing unit 13 through the pipeline on-off device 7, and the oil on-line monitoring and analyzing unit 13 can fully represent the oil sample in the transformer body to start analysis.
In a specific implementation manner of the embodiment of the present invention, the oil extraction method further includes: if the oil on-line monitoring and analyzing unit 13 does not damage the analyzed oil sample, after the oil on-line monitoring and analyzing is completed, the second pipeline on-off control device 4 and the third pipeline on-off control device 5 are opened, the volume of the first cavity is adjusted to be maximum, and the oil sample in the oil on-line monitoring and analyzing unit 13 is extracted into the oil storage cylinder 8.
In a specific implementation manner of the embodiment of the present invention, the oil extraction method further includes: the first pipeline on-off control device 3 and the oil drain valve 2 connected with the transformer 1 are opened, the third pipeline on-off control device 5 is closed, the first cavity volume is adjusted to 0 (the piston 9 can be pushed to the top of the oil storage cylinder 8 by pushing the piston rod 10 upwards), and the oil sample in the oil storage cylinder 8 is pushed back to the transformer body.
The working principle of the online monitoring single-port oil extraction method for transformer oil in the embodiment of the invention is described in detail below with reference to a specific implementation manner, in the implementation manner, the first pipeline on-off control device 3, the second pipeline on-off control device 4, the third pipeline on-off control device 5 and the fourth pipeline on-off control device 6 are respectively marked as a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve, and the pipeline on-off control device 7 is a three-way interface. The working process of the transformer oil on-line monitoring single-port oil extraction system comprises the following steps of:
(1) Opening the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, closing the fourth electromagnetic valve, pulling the piston 9 to the bottom of the oil storage cylinder 8 by using the piston rod 10, closing the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, opening the fourth electromagnetic valve, pushing the piston 9 to the top of the oil storage cylinder 8 by using the piston rod 10, discharging possible gas in the oil storage cylinder 8 and a pipeline from the exhaust port 12, and closing the fourth electromagnetic valve;
(2) Opening the first electromagnetic valve and the second electromagnetic valve, opening an oil drain valve 2 connected with the transformer 1, enabling a transformer oil sample to enter a storage cylinder 8 through a three-way interface, and closing the second electromagnetic valve after the oil drain valve 2 and a pipeline connected with the transformer 1 are fully flushed by the oil sample in the transformer body;
(3) Opening a third electromagnetic valve, enabling the oil sample in the transformer body to enter an oil on-line monitoring and analyzing unit 13 through a three-way interface, enabling the oil on-line monitoring and analyzing unit 13 to fully represent the oil sample in the transformer body to start analysis, and closing an oil drain valve 2, a first electromagnetic valve and a third electromagnetic valve which are connected with the transformer 1;
(4) If the oil on-line monitoring and analyzing unit 13 does not damage the analyzed oil sample (the oil sample does not change), opening the electromagnetic valve II and the electromagnetic valve III after the oil on-line monitoring and analyzing is finished, pulling the piston rod 10 downwards to extract the oil sample in the oil on-line monitoring and analyzing unit 13 into the oil storage cylinder 8, stopping pulling the piston rod 10 and closing the electromagnetic valve III;
(5) Opening the first electromagnetic valve and the oil drain valve 2 connected with the transformer 1, pushing the piston rod 10 upwards, pushing the piston 9 to the top of the oil storage cylinder 8, pushing the oil sample in the oil storage cylinder 8 back to the transformer body again, and closing the oil drain valve 2, the first electromagnetic valve and the second electromagnetic valve connected with the transformer 1;
(6) And (3) repeating the steps (2) to (6) when the oil sample taking analysis is needed by the on-line oil monitoring analysis unit 13.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (13)
1. An oil system is got to online monitoring single mouth of transformer oil, characterized in that includes:
a pipeline conduction device;
one end of the first pipeline is connected with a first port of the pipeline conduction device through a first pipeline on-off control device, and the other end of the first pipeline is used for being connected with transformer oil;
the oil storage cylinder comprises a first cavity and a second cavity, the volumes of which are adjustable and are in reverse change relation;
one end of the second pipeline is connected with the second port of the pipeline conduction device through a second pipeline on-off control device, and the other end of the second pipeline is communicated with the first cavity;
one end of the third pipeline is connected with a third port of the pipeline conduction device through a third pipeline on-off control device, and the other end of the third pipeline is used for oil discharge;
one end of the exhaust device is communicated with the first cavity through a fourth pipeline on-off control device, and the other end of the exhaust device is used for exhausting air;
when the first pipeline on-off control device and the second pipeline on-off control device are opened and the third pipeline on-off control device is closed, the pipeline on-off control device is communicated with an oil drain valve and an oil storage cylinder which are connected with a transformer, the volume of the first cavity is adjusted to be in a maximum state, and the pipeline on-off control device is matched with the exhaust device to exhaust gas possibly existing in the oil storage cylinder and each pipeline;
the other end of the third pipeline is connected with an oil on-line monitoring and analyzing unit;
when the first pipeline on-off control device and the third pipeline on-off control device are opened and the second pipeline on-off control device is closed, the pipeline on-off device is communicated with an oil drain valve and an oil on-line monitoring and analyzing unit which are connected with the transformer;
when the first pipeline on-off control device is closed and the second pipeline on-off control device and the third pipeline on-off control device are opened, the pipeline on-off device is communicated with an oil on-line monitoring and analyzing unit and a storage cylinder;
when the first pipeline on-off control device and the oil drain valve connected with the transformer are opened, and the third pipeline on-off control device is closed, the volume of the first cavity is adjusted to be 0, and an oil sample in the oil storage cylinder is pushed back to the transformer body again, so that the cyclic oil extraction and oil return are completed.
2. The transformer oil on-line monitoring single-port oil extraction system according to claim 1, wherein: a piston attached to the inner wall of the oil storage cylinder is arranged in the oil storage cylinder, and the piston divides the inner cavity of the oil storage cylinder into a first cavity and a second cavity;
the piston is also connected with a piston rod, and the other end of the piston rod passes through the second cavity of the oil storage cylinder and is positioned outside the oil storage cylinder.
3. The transformer oil on-line monitoring single-port oil extraction system according to claim 1, wherein: the first pipeline on-off control device, the second pipeline on-off control device, the third pipeline on-off control device and/or the fourth pipeline on-off control device are/is a valve.
4. The transformer oil on-line monitoring single-port oil extraction system according to claim 1, wherein: the pipeline conducting device is a three-way interface.
5. The transformer oil on-line monitoring single-port oil extraction system according to claim 2, wherein: the transformer oil on-line monitoring single-port oil extraction system further comprises a driving piece, wherein the driving piece is positioned outside the oil storage cylinder and connected with the piston rod.
6. The transformer oil on-line monitoring single-port oil extraction system according to claim 1, wherein: the volume of the oil storage cylinder is more than 2 times of the total volume of oil samples which can be carried in all pipelines between the oil drain valve connected with the oil outlet of the transformer and the oil storage cylinder.
7. An oil extraction method based on the online monitoring single-port circulation oil extraction system of the transformer oil in claim 1, which is characterized by comprising the following steps:
controlling the on-off state of each pipeline and the exhaust device so that the gas possibly existing in the oil storage cylinder and the pipelines is exhausted;
the on-off state of each pipeline and an oil drain valve connected with the transformer are controlled, so that the oil drain valve and the pipelines are fully flushed by an oil sample in the transformer body; the oil drain valve is communicated with the first pipeline on-off control device;
and controlling the first pipeline and the third pipeline to be in a communication state, and controlling the second pipeline to be in a closing state to finish oil extraction.
8. The oil extraction method according to claim 7, wherein: a piston attached to the inner wall of the oil storage cylinder is arranged in the oil storage cylinder, and the piston divides the inner cavity of the oil storage cylinder into a first cavity and a second cavity; the piston is also connected with a piston rod, and the other end of the piston rod passes through the second cavity of the oil storage cylinder and is positioned outside the oil storage cylinder;
the control of the on-off state of each pipeline and the exhaust device, so that the gas possibly existing in the oil storage cylinder and the pipeline is exhausted, comprises the following steps:
opening the first pipeline on-off control device, the second pipeline on-off control device and the third pipeline on-off control device, closing the fourth pipeline on-off control device, and pulling the piston by utilizing the piston rod to ensure that the volume of the first cavity is maximum;
and closing the first pipeline on-off control device, the second pipeline on-off control device and the third pipeline on-off control device, opening the fourth pipeline on-off control device, pushing the piston by utilizing the piston rod, so that the volume of the second cavity is maximum, and discharging possible gas in the oil storage cylinder and the pipeline.
9. The oil extraction method according to claim 7, wherein: the on-off state of each pipeline of control to and the oil drain valve that links to each other with the transformer for oil drain valve and pipeline are fully washed by the interior oil appearance of transformer body, include:
the first pipeline on-off control device, the second pipeline on-off control device and the oil drain valve communicated with the transformer are opened, the fourth pipeline on-off control device is closed, and an oil sample in the transformer body enters the oil storage cylinder through the pipeline on-off control device, so that the oil drain valve and the pipeline are fully flushed by the oil sample in the transformer body.
10. The oil extraction method of claim 8, further comprising:
the state of each pipeline on-off control device is controlled, so that the oil sample in the transformer body enters the oil on-line monitoring and analyzing unit through the pipeline on-off control device, and the oil on-line monitoring and analyzing unit can fully represent the oil sample in the transformer body to start analysis.
11. The oil extraction method according to claim 10, wherein: the state of each pipeline on-off control device of control for the oil appearance in the transformer body gets into oil on-line monitoring analysis unit through pipeline switching-on device, include:
closing the second pipeline on-off control device and the fourth pipeline on-off control device, opening the first pipeline on-off control device and the third pipeline on-off control device, and an oil drain valve communicated with the transformer, wherein an oil sample in the transformer body enters an oil on-line monitoring and analyzing unit through a pipeline on-off device, and the oil on-line monitoring and analyzing unit can fully represent the oil sample in the transformer body to start analysis.
12. The oil extraction method according to claim 11, characterized in that the oil extraction method further comprises: if the oil on-line monitoring and analyzing unit does not damage the analyzed oil sample, after the oil on-line monitoring and analyzing is completed, the second pipeline on-off control device and the third pipeline on-off control device are opened, the volume of the first cavity is adjusted to be maximum, and the oil sample in the oil on-line monitoring and analyzing unit is extracted into the oil storage cylinder.
13. The oil extraction method according to claim 12, characterized in that the oil extraction method further comprises: and opening the first pipeline on-off control device and an oil drain valve connected with the transformer, closing the third pipeline on-off control device, adjusting the volume of the first cavity to be 0, pushing the oil sample in the oil storage cylinder back to the transformer body again, and completing the cyclic oil extraction and oil return.
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| CN202210484595.7A CN115014868B (en) | 2022-05-06 | 2022-05-06 | Single-port oil extraction system and method for online monitoring of transformer oil |
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