CN115014868A - Single-port oil taking system and method for online monitoring of transformer oil - Google Patents
Single-port oil taking system and method for online monitoring of transformer oil Download PDFInfo
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- CN115014868A CN115014868A CN202210484595.7A CN202210484595A CN115014868A CN 115014868 A CN115014868 A CN 115014868A CN 202210484595 A CN202210484595 A CN 202210484595A CN 115014868 A CN115014868 A CN 115014868A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000000605 extraction Methods 0.000 claims abstract description 21
- 239000003921 oil Substances 0.000 claims description 380
- 239000010724 circulating oil Substances 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 6
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- 238000012806 monitoring device Methods 0.000 description 7
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- 238000005070 sampling Methods 0.000 description 2
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Abstract
The invention discloses a system and a method for online monitoring single-port oil taking of transformer oil, 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 the first cavity and the second cavity are adjustable, and the first cavity and the second cavity are in a reverse change relationship; 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 outlet; 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 circulation oil extraction, ensures the representativeness of the oil sample in the transformer body and does not cause excessive consumption of the oil sample in the transformer body.
Description
Technical Field
The invention belongs to the field of oil online monitoring, particularly relates to a system and a method for online monitoring and single-port oil taking of transformer oil, and more particularly relates to a circulating oil taking device and a circulating oil taking method capable of achieving online monitoring and 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 transformer oil) is equivalent to 'blood' of the transformer, online monitoring of the transformer oil in a non-power-off state is equivalent to 'blood test' of the equipment, and latent defects such as discharge, overheating and the like in the transformer can be found in time. At present, the on-line monitoring device for the transformer oil is widely installed and is used for analyzing and analyzing characteristic gas components in the transformer oil, and for example, the national grid company requires 100% of transformers of 220kV and above to be installed with the on-line monitoring device for the dissolved gas in the transformer oil. Because the online monitoring device is always installed beside the transformer for detection at regular time (such as once in 4 hours), if the obtained oil sample is always discharged, because the oil quantity for washing and detection is at least 100mL each time, the excessive oil sample in the transformer body can be consumed for a long time, two ports are required to be opened when the current online monitoring device is connected with the transformer, one port is an oil discharge port, the oil in the transformer enters the online monitoring device through the oil discharge port, and the other port is an oil return port, namely, the oil passing through the online monitoring device and a pipeline returns to the transformer again, so that the circulation of an oil way is realized. The mode of opening two mouths needs to punch more holes on the transformer body, and potential risks of the transformer body are increased.
Disclosure of Invention
In order to solve the problems, the invention provides an online monitoring single-port oil taking system and method for transformer oil, which can realize single-port circulating oil taking, ensure the representativeness of an oil sample in a 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 effects, the invention is realized by the following technical scheme:
in a first aspect, the present invention provides an online monitoring single-port oil-fetching system for transformer oil, comprising:
a pipeline conducting 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 accessing transformer oil;
the oil storage cylinder comprises a first cavity and a second cavity, the volumes of the first cavity and the second cavity are adjustable, and the first cavity and the second cavity are in a reverse change relationship;
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 outlet;
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 conduction device is communicated with an oil drain valve and an oil storage cylinder which are connected with the transformer, the volume of the first cavity is adjusted to be in the maximum state, and the pipeline conduction device is matched with the exhaust device and used for exhausting gas possibly existing in the oil storage cylinder and each pipeline.
Optionally, the other end of the third pipeline is connected with an oil online 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 conduction device is communicated with an oil drain valve and an oil online monitoring and analyzing unit which are connected with a 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 conduction device is communicated with the oil online monitoring and analyzing unit and the oil storage cylinder;
when the first pipeline on-off control device and an 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, the oil sample in the oil storage cylinder is pushed back into the transformer body again, and circulating oil taking and oil returning 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 an inner cavity of the oil storage cylinder into a first cavity and a second cavity;
the piston is further connected with a piston rod, and the other end of the piston rod penetrates through the second cavity of the oil storage cylinder and then is located outside the oil storage cylinder.
Optionally, the first, second, third and/or fourth pipeline on-off control devices are valves.
Optionally, the pipeline conducting device is a three-way interface.
Optionally, the transformer oil on-line monitoring single-port oil taking system further comprises a driving member, wherein the driving member is located 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 oil samples which can be borne 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 of a transformer oil online monitoring single-port circulation oil extraction system based on the first aspect, which includes:
controlling the on-off state of each pipeline and the exhaust device so as to discharge gas possibly existing in the oil storage cylinder and the pipelines;
controlling the on-off state of each pipeline and an oil drain valve connected with the transformer to ensure that the oil drain valve and the pipelines are fully washed by oil samples 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 communicated state, and controlling the second pipeline to be in a closed state to finish oil extraction.
Optionally, a piston attached to the inner wall of the oil storage cylinder is arranged inside the oil storage cylinder, and the piston divides an 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 to discharge the gas possibly existing in the oil storage cylinder and the pipeline comprises the following steps:
opening a first pipeline on-off control device, a second pipeline on-off control device and a third pipeline on-off control device, closing a fourth pipeline on-off control device, and pulling a piston by using a piston rod to enable the volume of the first cavity to be 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 using the piston rod, enabling the volume of the second cavity to be maximum, and discharging gas possibly existing in the oil storage cylinder and the pipeline.
Optionally, the control of the on-off state of each pipeline and the oil drain valve connected to the transformer make the oil drain valve and the pipeline fully flushed by the oil sample in the transformer body, includes:
and opening the first pipeline on-off control device, the second pipeline on-off control device and the oil drain valve communicated with the transformer, closing the fourth pipeline on-off control device, and enabling the oil sample in the transformer body to enter the oil storage cylinder through the pipeline on-off device, so that the oil drain valve and the pipeline are fully washed by the oil sample in the transformer body.
Optionally, the oil extraction method further comprises:
and controlling the state of each pipeline on-off control device, so that an oil sample in the transformer body enters the oil online monitoring and analyzing unit through the pipeline conduction device, and the oil online monitoring and analyzing unit can obtain the oil sample which can fully represent the transformer body and start to analyze.
Optionally, the controlling the state of each pipeline on-off control device makes the oil sample in the transformer body enter the oil online monitoring and analyzing unit through the pipeline conduction device, including:
and closing the second pipeline on-off control device and the fourth pipeline on-off control device, opening the first pipeline on-off control device, the third pipeline on-off control device and an oil drain valve communicated with the transformer, enabling an oil sample in the transformer body to enter the oil online monitoring and analyzing unit through the pipeline on-off control device, and taking the oil sample which can fully represent the oil sample in the transformer body to start analysis by the oil online monitoring and analyzing unit.
Optionally, the oil extraction method further comprises: if the oil online monitoring and analyzing unit does not cause destructiveness to the analyzed oil sample, after the oil online 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 the maximum, and the oil sample in the oil online 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, and pushing the oil sample in the oil storage cylinder back to the transformer body again to finish the circulating oil extraction and oil return.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention realizes the oil sampling, oil returning and circulation in the transformer body by a single port, does not need to additionally arrange an oil hole on the outer shell of the transformer equipment, and can directly utilize the oil drain valve communicated with the transformer.
(2) The invention can fully wash the pipeline to ensure the representativeness of the oil sample taken by the online monitoring device and can not excessively consume the oil sample in the transformer body.
(3) The invention does not use the external discharge of the oil sample in the whole process of carrying out on-line monitoring, and does not cause additional operation and maintenance burden to operators in the same line.
Drawings
In order that the manner in which the present invention is more fully understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, wherein:
fig. 1 is a schematic structural diagram of an online monitoring single-port oil taking system for transformer oil according to an embodiment of the invention;
wherein: 1-transformer, 2-oil drain valve, 3-first pipeline on-off control device, 4-second pipeline on-off control device, 5-third pipeline on-off control device, 6-fourth pipeline on-off control device, 7-pipeline on-off device, 8-oil storage cylinder, 9-piston, 10-piston rod, 11-power pump, 12-exhaust port and 13-oil on-line monitoring and analyzing unit.
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.
In the description of the present patent application, it is noted that the terms "upper", "lower", "left", "right", "horizontal", and the like refer to orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are used only for convenience in describing the present patent application and for simplicity in description, but do not indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present patent application.
In the description of the present patent application, it is noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected 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 through specific situations.
The application of the principles of the present invention will now be described in detail with reference to the accompanying drawings.
Example 1
Because the mode of opening two mouthfuls among the prior art needs to punch more on the transformer body, has increased the potential risk of transformer body. Therefore, the on-line monitoring single-port oil taking system for the transformer oil is provided in the embodiment of the invention, oil circuit circulation can be realized through one port, an oil drain valve arranged on a transformer body can be directly used, and redundant oil holes do not need to be drilled.
Specifically, an embodiment of the present invention provides an online monitoring single-port oil sampling system for transformer oil, as shown in fig. 1, including: the device comprises a pipeline conduction 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 accessing transformer oil; in the practical application process, the first pipeline on-off control device 3 is set to be communicated with an oil drain valve 2 communicated with an 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 are in a reverse change relationship, namely, if the volume of the first cavity is increased, the volume of the second cavity is reduced, and the variation amplitudes are consistent;
one end of the second pipeline is connected with a second port of the pipeline conduction device 7 through a 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 conduction 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 oil storage cylinder and possible gas in each pipeline are discharged by matching with the exhaust device; in a specific implementation, the exhaust device is an exhaust port 12;
based on the above description, it can be seen that the working process of the on-line monitoring single-port oil taking system for transformer oil in the embodiment of the present invention is as follows:
controlling the on-off state of each pipeline and the exhaust device so that gas possibly existing in the oil storage cylinder 8 and the pipelines is exhausted;
controlling the on-off state of each pipeline and an oil drain valve 2 connected with the transformer 1, so that the oil drain valve 2 and the pipelines are fully washed by oil samples in the transformer body; the oil drain valve 2 is communicated with a first pipeline on-off control device 3;
and controlling the first pipeline and the third pipeline to be in a communicated state, and controlling the second pipeline to be in a closed 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 accurately control 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 tee joint, 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 reserve cylinder 8 is more than 2 times of the total volume of oil samples that can be carried in all the pipelines between the oil drain valve 2 connected to the oil outlet of the transformer 1 and the reserve cylinder 8, so as to ensure that the pipelines are sufficiently cleaned, and ensure that the oil sample analyzed by the oil online monitoring unit is "fresh" oil sample in the transformer 11 body, but not oil sample in the pipelines, and generally, the volume of the reserve cylinder 8 can be set to about 2L.
In a specific implementation manner of the embodiment of the present invention, a piston 9 attached to an inner wall of the reserve tube 8 is disposed inside the reserve tube 8, and the piston 9 divides an inner cavity of the reserve tube 8 into a first cavity and a second cavity; the piston 9 is further connected with a piston rod 10, and the other end of the piston rod 10 penetrates through the second cavity of the oil storage cylinder 8 and then is located outside the oil storage cylinder 8. In the specific implementation process, the piston 9 and the piston rod 10 are connected into a whole to ensure that the piston 9 in the oil storage cylinder 8 has good sealing performance and does not leak oil. The piston 9 is driven by a 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 to move 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 can 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 online monitoring single-port oil-taking system for the transformer oil further includes a driving member, which is located outside the oil storage cylinder 8 and connected to the piston rod 10. In the specific implementation process, the driving piece can be selected from the power pump 11, and can also be selected from manual driving, and the setting is specifically carried out according to the actual situation.
In a specific implementation manner of the embodiment of the present invention, the other end of the third pipeline is connected to an oil online 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 conduction device 7 is communicated with the oil drain valve 2 and the oil online monitoring and analyzing unit 13 which are connected with the transformer 1, so that the oil sample in the transformer body is sent to the oil online monitoring and analyzing unit 13 for analysis; when the first pipeline on-off control device 3 is closed, and the second pipeline on-off control device 4 and the third pipeline on-off control device 5 are opened, the pipeline conduction device 7 is communicated with the oil online monitoring and analyzing unit 13 and the oil storage cylinder 8, so that after analysis is completed, an oil sample in the oil online monitoring and analyzing unit 13 is pumped into the oil storage cylinder 8, then the first pipeline on-off control device 3 and the oil discharge valve 2 are opened, the volume of the first cavity is adjusted to be 0, the oil sample in the oil storage cylinder is pushed back to the transformer body again, and oil taking and oil returning in a circulating mode 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 circulating oil taking and oil returning are completed.
Therefore, the single-port oil taking system for online monitoring of the transformer oil in the embodiment of the invention can realize single-port circulating oil taking, ensure the representativeness of the oil sample in the transformer body and avoid excessive consumption of the oil sample in the transformer body.
The working principle of the on-line monitoring single-port oil-taking system for transformer oil in the embodiment of the present invention is described in detail below with reference to a specific embodiment, in this embodiment, 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 conduction device 7 is a three-way connector. The working process of the transformer oil on-line monitoring single-port oil taking system comprises the following steps:
(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 the oil storage cylinder 8 and gas possibly existing in a pipeline from the exhaust port 12, and closing the fourth electromagnetic valve;
(2) opening a first electromagnetic valve and a second electromagnetic valve, opening an oil drain valve 2 connected with a transformer 1, enabling a transformer oil sample to enter an oil storage cylinder 8 through a three-way connector, and closing the second electromagnetic valve after the oil drain valve 2 connected with the transformer 1 and a pipeline are fully flushed by the oil sample in the transformer body;
(3) opening a third electromagnetic valve, enabling an oil sample in the transformer body to enter an oil online monitoring and analyzing unit 13 through a three-way connector, enabling the oil online monitoring and analyzing unit 13 to obtain the oil sample which can fully represent 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 online monitoring and analyzing unit 13 does not cause destructiveness to the analyzed oil sample (the oil sample does not change), after the oil online monitoring and analyzing is finished, the second electromagnetic valve and the third electromagnetic valve are opened, the piston rod 10 is pulled downwards to pump the oil sample in the oil online monitoring and analyzing unit 13 into the oil storage cylinder 8, and the piston rod 10 is stopped from being pulled and the third electromagnetic valve is closed;
(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 (5) repeating the steps (2) to (6) when the oil online monitoring and analyzing unit 13 needs to take an oil sample for analysis next time.
Example 2
The invention provides an oil extraction method based on the transformer oil on-line monitoring single-port circulating oil extraction device in embodiment 1, which comprises the following steps:
controlling the on-off state of each pipeline and the exhaust device so that gas possibly existing in the oil storage cylinder 8 and the pipelines is exhausted;
controlling the on-off state of each pipeline and an oil drain valve 2 connected with the transformer 1, so that the oil drain valve 2 and the pipelines are fully washed by oil samples in the transformer body; the oil drain valve 2 is communicated with a first pipeline on-off control device 3;
and controlling the first pipeline and the third pipeline to be in a communicated state, and controlling the second pipeline to be in a closed state to finish oil extraction.
In a specific implementation manner of the embodiment of the present invention, a piston 9 attached to an inner wall of the oil storage cylinder 8 is disposed inside the oil storage cylinder 8, and the piston 9 divides an inner cavity of the oil storage cylinder 8 into a first cavity and a second cavity; the piston 9 is further connected with a piston rod 10, and the other end of the piston rod 10 penetrates through the second cavity of the oil storage cylinder 8 and is located outside the oil storage cylinder 8
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 8 and the pipeline is exhausted comprises the following steps:
opening a first pipeline on-off control device 3, a second pipeline on-off control device 4 and a third pipeline on-off control device 5, closing a fourth pipeline on-off control device 6, and pulling a piston 9 by using a piston rod 10 to enable the volume of the first cavity to be maximum;
and closing 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, opening the fourth pipeline on-off control device 6, pushing the piston 9 by using the piston rod 10, enabling the volume of the second cavity to be maximum, and discharging gas possibly existing in the oil storage cylinder 8 and the pipeline.
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 to make the oil drain valve 2 and the pipelines be sufficiently flushed by the oil sample in the transformer body includes:
and opening 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, closing the fourth pipeline on-off control device 6, and enabling the oil sample in the transformer body to enter the oil storage cylinder 8 through the pipeline on-off device 7, so that the oil drain valve 2 and the pipeline are fully washed 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:
and controlling the state of each pipeline on-off control device to ensure 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 takes the oil sample which can fully represent the transformer body to begin analysis. The method specifically comprises the following steps:
and closing the second pipeline on-off control device 4 and the fourth pipeline on-off control device 6, opening 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, enabling an oil sample in the transformer body to enter the oil online monitoring and analyzing unit 13 through the pipeline on-off control device 7, and enabling the oil online monitoring and analyzing unit 13 to obtain the oil sample which can fully represent the oil sample in the transformer body and start analysis.
In a specific implementation manner of the embodiment of the present invention, the oil extraction method further includes: if the oil online monitoring and analyzing unit 13 does not cause destructiveness to the analyzed oil sample, after the oil online 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 the maximum, and the oil sample in the oil online monitoring and analyzing unit 13 is pumped 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 volume of the first cavity is adjusted to be 0 (the volume can be adjusted to be 0 by pushing the piston rod 10 upwards and pushing the piston 9 to the top of the oil storage cylinder 8), and the oil sample in the oil storage cylinder 8 is pushed back into the transformer body again.
The working principle of the online monitoring single-port oil-taking method for transformer oil in the embodiment of the present invention is described in detail below with reference to a specific embodiment, in this embodiment, 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 conduction device 7 is a three-way interface. The working process of the transformer oil on-line monitoring single-port oil taking system comprises the following steps:
(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 the oil storage cylinder 8 and gas possibly existing in a pipeline from the exhaust port 12, and closing the fourth electromagnetic valve;
(2) opening a first electromagnetic valve and a second electromagnetic valve, opening an oil drain valve 2 connected with a transformer 1, enabling a transformer oil sample to enter an oil storage cylinder 8 through a three-way connector, and closing the second electromagnetic valve after the oil drain valve 2 connected with the transformer 1 and a pipeline are fully flushed by the oil sample in the transformer body;
(3) opening a third electromagnetic valve, enabling an oil sample in the transformer body to enter an oil online monitoring and analyzing unit 13 through a three-way connector, enabling the oil online monitoring and analyzing unit 13 to obtain the oil sample which can fully represent 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 online monitoring and analyzing unit 13 does not cause damage to the analyzed oil sample (the oil sample does not change), opening the second electromagnetic valve and the third electromagnetic valve after the oil online monitoring and analyzing is finished, pulling the piston rod 10 downwards to extract the oil sample in the oil online monitoring and analyzing unit 13 into the oil storage cylinder 8, stopping pulling the piston rod 10, and closing the third electromagnetic valve;
(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 (5) repeating the steps (2) to (6) when the oil online monitoring and analyzing unit 13 needs to take an oil sample for analysis next time.
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 (15)
1. The utility model provides a transformer oil on-line monitoring list mouthful system of getting oil which characterized in that includes:
a pipeline conducting 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 accessing transformer oil;
the oil storage cylinder comprises a first cavity and a second cavity, the volumes of the first cavity and the second cavity are adjustable, and the first cavity and the second cavity are in a reverse change relationship;
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 outlet;
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.
2. The transformer oil on-line monitoring single-port oil taking system according to claim 1, characterized in that:
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 conduction device is communicated with the oil drain valve and the oil storage cylinder which are connected with the transformer, the volume of the first cavity is adjusted to be in the maximum state, and the pipeline conduction device is matched with the exhaust device and used for exhausting gas possibly existing in the oil storage cylinder and each pipeline.
3. The transformer oil on-line monitoring single-port oil taking system according to claim 1, characterized in that: the other end of the third pipeline is connected with an oil online 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 conduction device is communicated with an oil drain valve and an oil online monitoring and analyzing unit which are connected with a 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 conduction device is communicated with the oil online monitoring and analyzing unit and the oil storage cylinder;
when the first pipeline on-off control device and an 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, the oil sample in the oil storage cylinder is pushed back into the transformer body again, and circulating oil taking and oil returning are completed.
4. The transformer oil on-line monitoring single-port oil taking system according to claim 1, characterized in that: a piston attached to the inner wall of the oil storage cylinder is arranged in the oil storage cylinder, and the piston divides an 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 penetrates through the second cavity of the oil storage cylinder and then is positioned outside the oil storage cylinder.
5. The transformer oil on-line monitoring single-port oil taking system according to claim 1, characterized in that: 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.
6. The transformer oil on-line monitoring single-port oil taking system according to claim 1, characterized in that: the pipeline conduction device is a three-way connector.
7. The transformer oil on-line monitoring single-port oil taking system according to claim 1, characterized in that: the transformer oil on-line monitoring single-port oil taking system further comprises a driving piece, wherein the driving piece is located outside the oil storage cylinder and connected with the piston rod.
8. The transformer oil on-line monitoring single-port oil taking system according to claim 1, characterized in that: the volume of the oil storage cylinder is more than 2 times of the total volume of oil samples which can be borne in all pipelines between the oil drain valve connected with the oil outlet of the transformer and the oil storage cylinder.
9. The oil taking method of the transformer oil on-line monitoring single-port circulation oil taking system based on the claim 1 is characterized by comprising the following steps of:
controlling the on-off state of each pipeline and the exhaust device so as to discharge gas possibly existing in the oil storage cylinder and the pipelines;
controlling the on-off state of each pipeline and an oil drain valve connected with the transformer to ensure that the oil drain valve and the pipelines are fully washed by oil samples 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 communicated state, and controlling the second pipeline to be in a closed state to finish oil taking.
10. The oil extraction method according to claim 9, characterized in that: a piston attached to the inner wall of the oil storage cylinder is arranged in the oil storage cylinder, and the piston divides an 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 penetrates 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 to discharge the gas possibly existing in the oil storage cylinder and the pipeline comprises the following steps:
opening a first pipeline on-off control device, a second pipeline on-off control device and a third pipeline on-off control device, closing a fourth pipeline on-off control device, and pulling a piston by using a piston rod to enable the volume of the first cavity to be 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 using the piston rod, enabling the volume of the second cavity to be maximum, and discharging gas possibly existing in the oil storage cylinder and the pipeline.
11. The oil extraction method according to claim 9, characterized in that: the on-off state of each pipeline of control to and the fuel outlet valve that links to each other with the transformer for fuel outlet valve and pipeline are fully washed by this internal oil appearance of transformer, include:
and opening the first pipeline on-off control device, the second pipeline on-off control device and the oil drain valve communicated with the transformer, closing the fourth pipeline on-off control device, and enabling the oil sample in the transformer body to enter the oil storage cylinder through the pipeline on-off control device, so that the oil drain valve and the pipeline are fully washed by the oil sample in the transformer body.
12. The method of claim 10, further comprising:
and controlling the state of each pipeline on-off control device to ensure that the oil sample in the transformer body enters the oil on-line monitoring and analyzing unit through the pipeline conduction device, and the oil on-line monitoring and analyzing unit takes the oil sample which can fully represent the transformer body to begin analysis.
13. The oil extraction method according to claim 12, characterized in that: the state of each pipeline on-off control device of control for this internal oil sample of transformer switches on the device through the pipeline and gets into oily on-line monitoring analysis unit, includes:
and closing the second pipeline on-off control device and the fourth pipeline on-off control device, opening the first pipeline on-off control device, the third pipeline on-off control device and an oil drain valve communicated with the transformer, enabling the oil sample in the transformer body to enter the oil online monitoring and analyzing unit through the pipeline on-off control device, and enabling the oil online monitoring and analyzing unit to obtain the oil sample which can fully represent the oil sample in the transformer body and start to analyze.
14. The method of claim 13, further comprising: if the oil online monitoring and analyzing unit does not cause destructiveness to the analyzed oil sample, after the oil online 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 the maximum, and the oil sample in the oil online monitoring and analyzing unit is extracted into the oil storage cylinder.
15. The method of claim 14, further comprising: 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, and pushing the oil sample in the oil storage cylinder back to the transformer body again to finish the circulating 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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| 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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