Power transformer accident oil sampling device
By using pressure reducing valves and oil pipes to bypass the firewall in the transformer accident oil sample collection device, the problem of excessive oil pressure and safety risks during oil sample collection is solved, and safe oil sample sampling and isolation sampling are achieved , reduces the risk of fire.
Patent Information
- Application Number
- CN202323415731.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-14
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2033-12-14
AI Technical Summary
The existing accident oil sample device has safety risks when used. The oil sample pipeline is too high and is prone to oil leakage and injection, which increases the risk of fire and difficulty in handling.
A power transformer accident oil sample device including pressure reducing valve, oil pipe and sample parts is designed. The pressure reducing valve is sealed and connected to the transformer oil retrieval port. The oil retrieval pipe bypasses the firewall to ensure that the oil pressure in the oil retrieval pipe is lower than that of the Transformer pressure prevents oil injection and realizes the physical isolation of the sampling port from the transformer body through the firewall.
It effectively reduces the risk of oil coupling pipe rupture, ensures the safety of the sampling process, and prevents fire risks through isolation, ensuring the safety of operation and maintenance personnel.
Smart Images
Figure CN222212329U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric power equipment, in particular to an oil sampling device for an electric transformer accident. Background Art
[0002] For large power plants, after the generator generates electricity, it needs to be stepped up to the grid voltage (500kV) through the main transformer. For million-kilowatt-level generators, a transformer with a particularly large capacity is required to step up the voltage. Therefore, large power plants generally use single-phase transformers, that is, phases A, B, and C are stepped up by an independent single-phase transformer respectively. These three single-phase transformers can be named main transformer phase A, main transformer phase B, and main transformer phase C respectively. Since the three single-phase transformers are independent of each other, when a single single-phase transformer has a fire, explosion, or other fault, in order to reduce the impact on other single-phase transformers, a firewall is generally established between adjacent single-phase transformers to achieve physical isolation of the main transformer.
[0003] For the above-mentioned transformers in operation (generally large oil-immersed transformers), their failure will cause a large area of power unavailability. For a million-kilowatt nuclear power plant, in addition to the role of transmitting electricity, the transformer also needs to provide backup power for the operation of the unit in the event of an emergency in the power plant. Once the transformer protection system is activated, maintenance personnel must immediately check the on-site situation to ensure that the power supply is restored as soon as possible. In the event of an internal transformer failure, it is necessary to take oil samples for testing and analysis of the internal gas composition to analyze the specific cause of the failure. Due to the uncertainty of the failure, if the conventional oil sampling method is used directly to take samples, the operation and maintenance personnel will need to operate on the transformer body, which poses a great safety risk.
[0004] However, the existing accident oil sampling device has some shortcomings when in use. Its structure is relatively simple, and the oil pressure in the oil sampling pipeline is too high, which poses a risk of oil leakage and spraying. If the oil sampling pipeline ruptures, the sprayed transformer oil will increase the fire risk and handling difficulty. Therefore, we need to propose a safe power transformer accident oil sampling device. Utility Model Content
[0005] In view of some of the above shortcomings of the prior art, the utility model provides an oil sampling device for power transformer accidents, which solves the safety problem of taking oil samples from the power transformer body in an accident.
[0006] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a power transformer accident oil sampling device, comprising:
[0007] A pressure reducing valve, the pressure reducing valve is sealed and connected to the oil extraction port of the transformer body, and the inlet of the pressure reducing valve is communicated with the oil extraction port;
[0008] An oil connecting pipe, one end of which is connected to the outlet of the pressure reducing valve;
[0009] A sampling piece, the inlet of the sampling piece is connected to the other end of the oil union pipe, and the outlet of the sampling piece is a sampling port;
[0010] The oil connection pipe bypasses the firewall so that the firewall is located between the sampling port and the oil extraction port of the transformer body.
[0011] In one embodiment of the present invention, the pressure reducing valve is a direct-acting pressure reducing valve.
[0012] In one embodiment of the present invention, the pressure reducing valve is sealed and connected to the oil inlet of the transformer body through a flange or a rubber gasket.
[0013] In one embodiment of the present invention, the sampling component at least includes a needle valve, the inlet of the needle valve is connected to the oil connection pipe, and the outlet of the needle valve is the sampling port.
[0014] In one embodiment of the utility model, the sampling component includes a needle valve and a sampling syringe, the inlet of the needle valve is connected to the oil connection pipe, and the outlet of the needle valve is connected to the sampling syringe.
[0015] In one embodiment of the utility model, the transformer body is an oil-immersed single-phase transformer, and is any one of more than one single-phase transformers in a large power plant, and firewalls are provided between adjacent single-phase transformers of the more than one single-phase transformers.
[0016] In one embodiment of the present invention, two firewalls are arranged between the sampling port and the oil extraction port, so that the sampling port and the oil extraction port are physically isolated and phase-separated sampling is performed.
[0017] In one embodiment of the utility model, the device further includes a first pressure reducing valve, a second pressure reducing valve and a third pressure reducing valve respectively connected to the main transformer A-phase transformer, the main transformer B-phase transformer and the main transformer C-phase transformer, a first oil coupling pipe, a second oil coupling pipe and a third oil coupling pipe respectively connected to the first pressure reducing valve, the second pressure reducing valve and the third pressure reducing valve, and a first sampling piece, a second sampling piece and a third sampling piece respectively connected to the first oil coupling pipe, the second oil coupling pipe and the third oil coupling pipe.
[0018] In one embodiment of the utility model, a first firewall is provided between the main transformer A-phase transformer and the external environment, a second firewall is provided between the main transformer A-phase transformer and the main transformer B-phase transformer, a third firewall is provided between the main transformer B-phase transformer and the main transformer C-phase transformer, and a fourth firewall is provided between the main transformer C-phase transformer and the external environment; one end of the first oil coupling pipe is arranged to bypass the second firewall and the third firewall in sequence, one end of the second oil coupling pipe is arranged to bypass the second firewall and the first firewall in sequence, and one end of the third oil coupling pipe is arranged to bypass the third firewall and the second firewall in sequence.
[0019] In one embodiment of the utility model, when taking oil samples from the main transformer A-phase transformer, one end of the first oil coupling pipe is connected to the first oil extraction port of the main transformer A-phase transformer, and the other end of the first oil coupling pipe bypasses the second firewall and the third firewall in sequence to extend to the area where the main transformer C-phase transformer is located, and is connected to the first sampling piece; when taking oil samples from the main transformer B-phase transformer, one end of the second oil coupling pipe is connected to the second oil extraction port of the main transformer B-phase transformer, and the other end of the second oil coupling pipe bypasses the second firewall and the first firewall in sequence to extend to the outside of the first firewall, and is connected to the second sampling piece; when taking oil samples from the main transformer C-phase transformer, one end of the third oil coupling pipe is connected to the third oil extraction port of the main transformer C-phase transformer, and the other end of the third oil coupling pipe bypasses the third firewall and the second firewall in sequence to extend to the area where the main transformer A-phase transformer is located, and is connected to the third sampling piece.
[0020] The beneficial technical effects of the utility model include at least:
[0021] The utility model discloses an oil sampling device for power transformer accidents, comprising a pressure reducing valve, an oil coupling pipe and a sampling piece, wherein the pressure reducing valve is sealed and connected to the oil extraction port of the transformer body, and the inlet of the pressure reducing valve is connected to the oil extraction port, one end of the oil coupling pipe is connected to the outlet of the pressure reducing valve, the inlet of the sampling piece is connected to the other end of the oil coupling pipe, the outlet of the sampling piece is the sampling port, and the oil coupling pipe bypasses the firewall, so that the firewall is located between the sampling port and the oil extraction port of the transformer body. The pressure reducing valve arranged at the oil extraction port of the transformer body not only plays the role of opening and closing the oil extraction port, but also plays the role of pressure relief, ensuring that the oil pressure in the pipeline of the oil coupling pipe is far lower than the pressure level in the transformer body, preventing the oil coupling pipe from rupturing, and even if the oil coupling pipe ruptures, there will be no accident of oil injection; when the oil pressure in the pipeline of the oil coupling pipe is at a safe level, oil sampling at the sampling port ensures sampling safety, and at the same time, the firewall is located between the sampling port and the oil extraction port of the transformer body, so that the transformer body and the sampling port are physically isolated, and the isolated oil sampling further ensures sampling safety. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 A schematic diagram of the structure of an oil sampling device for power transformer accidents provided by an embodiment of the utility model;
[0023] Figure 2 It is a schematic diagram of the arrangement of the main transformer in one embodiment of the utility model.
[0024] Component Symbols:
[0025] Pressure reducing valve 1, transformer body 2, oil extraction port 21, oil coupling pipe 3, sampling piece 4, sampling port 41, firewall 5, first firewall 501, second firewall 502, third firewall 503, fourth firewall 504, main transformer A-phase transformer 201, main transformer B-phase transformer 202, main transformer C-phase transformer 203, first oil coupling pipe 301, second oil coupling pipe 302, third oil coupling pipe 303. DETAILED DESCRIPTION
[0026] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.
[0027] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.
[0028] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.
[0029] See also Figure 1 , an oil sampling device for power transformer accidents, comprising a pressure reducing valve 1, an oil coupling pipe 3 and a sampling piece 4, wherein the pressure reducing valve 1 is sealed and connected to the oil extraction port 21 of the transformer body 2, and the inlet of the pressure reducing valve 1 is connected to the oil extraction port 21; one end of the oil coupling pipe 3 is connected to the outlet of the pressure reducing valve 1; the inlet of the sampling piece 4 is connected to the other end of the oil coupling pipe 3, and the outlet of the sampling piece 4 is the sampling port 41; wherein the oil coupling pipe 3 bypasses the firewall 5, so that the firewall 5 is located between the sampling port 41 and the oil extraction port 21 of the transformer body 2, and the physical isolation between the sampling port 41 and the oil extraction port 21 is achieved. The pressure reducing valve 1 reduces the oil pressure in the pipeline of the oil coupling pipe 3 to a level far lower than the pressure level in the transformer body, and even when the oil coupling pipe ruptures, there will be no accident of oil injection.
[0030] The pressure reducing valve 1 is a direct-acting pressure reducing valve, and the pressure reducing valve 1 can be connected to the oil extraction port 21 of the transformer body 2 through a flange or a rubber gasket seal. The sampling member 4 includes a needle valve and a sampling syringe, the inlet of the needle valve is connected to the oil connection pipe 3, the outlet of the needle valve is the sampling port 41, and the outlet of the needle valve is connected to the sampling syringe.
[0031] In one embodiment of the present invention, see Figure 2 After the generator of a large power plant generates electricity, it needs to be stepped up to the grid voltage (500kV) through a main transformer. For a million-kilowatt-level generator set, a transformer with a particularly large capacity is required to step up the voltage. Therefore, large power plants generally use single-phase transformers, that is, phases A, B, and C are stepped up by an independent single-phase transformer respectively. These three transformers are main transformer A-phase transformer 201, main transformer B-phase transformer 202, and main transformer C-phase transformer 203, and main transformer A-phase transformer 201, main transformer B-phase transformer 202, and main transformer C-phase transformer 203 are arranged in sequence.
[0032] Since the three transformers are independent of each other, when a single transformer has a fire, explosion or other fault, in order to reduce the impact on the other two-phase transformers and the external environment, a firewall 5 is generally installed between the two adjacent transformers and between the transformers at both ends and the external environment to achieve physical isolation of the main transformer. Figure 2 In the illustrated embodiment, a first firewall 501, a second firewall 502, a third firewall 503 and a fourth firewall 504 are provided. The second firewall 502 isolates the main transformer A-phase transformer 201 and the main transformer B-phase transformer 202, the third firewall 503 isolates the main transformer B-phase transformer 202 and the main transformer C-phase transformer 203, the first firewall 501 isolates the main transformer A-phase transformer 201 and the external environment, and the fourth firewall 504 isolates the main transformer C-phase transformer and the external environment.
[0033] The device of the utility model further includes a first pressure reducing valve, a second pressure reducing valve and a third pressure reducing valve respectively connected to the main transformer A phase transformer 201, the main transformer B phase transformer 202 and the main transformer C phase transformer 203, a first oil coupling pipe 301, a second oil coupling pipe 302 and a third oil coupling pipe 303 respectively connected to the first pressure reducing valve, the second pressure reducing valve and the third pressure reducing valve, and a first sampling piece, a second sampling piece and a third sampling piece respectively connected to the first oil coupling pipe 301, the second oil coupling pipe 302 and the third oil coupling pipe 303.
[0034] When taking oil samples from the main transformer A-phase transformer 201, one end of the first oil joint pipe 301 is connected to the first oil extraction port of the main transformer A-phase transformer 201, and the other end of the first oil joint pipe 301 bypasses the second firewall 502 and the third firewall 503 in turn, extends to the area where the main transformer C-phase transformer 203 is located, and is connected to the first sampling piece; when taking oil samples from the main transformer B-phase transformer 202, one end of the second oil joint pipe 302 is connected to the second oil extraction port of the main transformer B-phase transformer 202, and the second oil joint pipe 301 is connected to the second oil extraction port of the main transformer B-phase transformer 202. The other end of the third oil connection pipe 303 bypasses the first firewall 501 and the second firewall 502 in sequence, extends to the outside of the first firewall 501, and is connected to the second sampling piece; when taking oil samples from the main transformer C-phase transformer 203, one end of the third oil connection pipe 303 is connected to the third oil extraction port of the main transformer C-phase transformer 203, and the other end of the third oil connection pipe 303 bypasses the second firewall 502 and the third firewall 503 in sequence, extends to the area where the main transformer A-phase transformer 201 is located, and is connected to the third sampling piece.
[0035] In this way, the device of the utility model takes oil samples from the above-mentioned main transformer A phase transformer 201, main transformer B phase transformer 202 or main transformer C phase transformer 203 respectively, and through the connection of the first oil joint pipe 301, the second oil joint pipe 302 or the third oil joint pipe 303, the main transformer A phase transformer 201 and the first sampling piece, the main transformer B phase transformer 202 and the second sampling piece, and the main transformer C phase transformer 203 and the third sampling piece all bypass two firewalls 5. Physical isolation is achieved between each sampling port 41 and the corresponding oil sampling port 21, that is, the sampling port 41 is separated from the corresponding transformer body 2 by the firewall 5, and the oil sampling performed in this way is phase-separated sampling.
[0036] At the same time, since the internal oil pressure of the main transformer A phase transformer 201, the main transformer B phase transformer 202 and the main transformer C phase transformer 203 can reach the pressure level of about 5 meters of water pressure, if the oil sample is directly taken from the inside of the main transformer A phase transformer 201, the main transformer B phase transformer 202 or the main transformer C phase transformer 203 through a syringe, the pipeline may be broken and an accident may occur, and the sprayed transformer oil will increase the risk of fire and the difficulty of handling. The first oil extraction port of the main transformer A phase transformer 201, the second oil extraction port of the main transformer B phase transformer 202 and the third oil extraction port of the main transformer C phase transformer 203 are respectively connected to the first pressure reducing valve, the second pressure reducing valve and the third pressure reducing valve, which not only play the role of opening and closing the first oil extraction port, the second oil extraction port and the third oil extraction port, but also play the role of pressure relief. Ensure that the oil pressure in the first oil coupling pipe 301, the second oil coupling pipe 302 and the third oil coupling pipe 303 is much lower than the oil pressure level inside the corresponding transformer, prevent the pipeline from rupture failure, and reduce the risk of fire in the event of an accident.
[0037] In summary, the utility model is a power transformer accident oil sampling device, the pressure reducing valve 1 is sealed and connected to the oil extraction port 21 of the transformer body 2, and the inlet of the pressure reducing valve 1 is connected to the oil extraction port 21, one end of the oil coupling pipe 3 is connected to the outlet of the pressure reducing valve 1, the inlet of the sampling member 4 is connected to the other end of the oil coupling pipe 3, the outlet of the sampling member 4 is the sampling port 41, and the oil coupling pipe 3 bypasses the firewall 5, so that the firewall 5 is located between the sampling port 41 and the oil extraction port 21 of the transformer body 2. The pressure reducing valve 1 not only plays the role of opening and closing the oil extraction port 21, but also plays the role of pressure relief, ensuring that the oil pressure in the pipeline of the oil coupling pipe 3 is much lower than the pressure level in the transformer body 2, preventing the oil coupling pipe 3 from rupturing, and even if the oil coupling pipe 3 ruptures, there will be no accident of oil injection. When the oil pressure in the pipeline of the oil connection pipe 3 is at a safe level, oil sampling at the sampling port 41 ensures sampling safety. At the same time, the firewall 3 is located between the sampling port 41 and the oil sampling port 21 of the transformer body 2, so that the transformer body 2 and the sampling port 41 are physically isolated. The isolated oil sampling also further ensures sampling safety. Therefore, the utility model solves the safety problem of oil sampling of the power transformer body in an accident, prevents accidents, and ensures the safety of operation and maintenance / sampling personnel.
[0038] The flow chart and block diagram in the accompanying drawings illustrate the possible implementation architecture, function and operation of the method and computer program product according to various embodiments of the utility model. In this regard, each box in the flow chart or block diagram can represent a module, a program segment, or a part of a code, and the module, the program segment, or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.
[0039] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.
Claims
1. An oil sampling device for power transformer accidents, characterized in that: include: A pressure reducing valve (1), the pressure reducing valve (1) being sealed and connected to an oil extraction port (21) of a transformer body (2), and an inlet of the pressure reducing valve (1) being in communication with the oil extraction port (21); An oil connecting pipe (3), one end of which is connected to the outlet of the pressure reducing valve (1); A sampling piece (4), the inlet of the sampling piece (4) is connected to the other end of the oil connection pipe (3), and the outlet of the sampling piece (4) is a sampling port (41); The oil connection pipe (3) bypasses the firewall (5), so that the firewall (5) is located between the sampling port (41) and the oil extraction port (21) of the transformer body (2).
2. The device for collecting oil samples in case of power transformer accidents according to claim 1, characterized in that: The pressure reducing valve (1) is a direct-acting pressure reducing valve.
3. The device for collecting oil samples in case of power transformer accidents according to claim 2, characterized in that: The pressure reducing valve (1) is sealed and connected to the oil extraction port (21) of the transformer body (2) via a flange or a rubber gasket.
4. The device for collecting oil samples in case of power transformer accidents according to claim 1, characterized in that: The sampling component (4) at least comprises a needle valve, the inlet of the needle valve is connected to the oil connection pipe (3), and the outlet of the needle valve is the sampling port (41).
5. The device for collecting oil samples in case of power transformer accidents according to claim 1, characterized in that: The sampling component (4) comprises a needle valve and a sampling syringe, the inlet of the needle valve is connected to the oil connection pipe (3), and the outlet of the needle valve is connected to the sampling syringe.
6. The device for collecting oil samples in case of power transformer accidents according to claim 1, characterized in that: The transformer body (2) is an oil-immersed single-phase transformer and is any one of more than three single-phase transformers in a large power plant, and the firewall (5) is provided between adjacent single-phase transformers among the more than three single-phase transformers.
7. The device for collecting oil samples in case of power transformer accidents according to claim 6, characterized in that: Two fire walls (5) are arranged between the sampling port (41) and the oil extraction port (21), so that physical isolation is achieved between the sampling port (41) and the oil extraction port (21).
8. The device for collecting oil samples in case of power transformer accidents according to claim 6, characterized in that: The device further comprises a first pressure reducing valve, a second pressure reducing valve and a third pressure reducing valve respectively connected to the main transformer A-phase transformer (201), the main transformer B-phase transformer (202) and the main transformer C-phase transformer (203), a first oil coupling pipe (301), a second oil coupling pipe (302) and a third oil coupling pipe (303) respectively connected to the first pressure reducing valve, the second pressure reducing valve and the third pressure reducing valve, and a first sampling piece, a second sampling piece and a third sampling piece respectively connected to the first oil coupling pipe (301), the second oil coupling pipe (302) and the third oil coupling pipe (303).
9. The device for collecting oil samples in case of power transformer accidents according to claim 8, characterized in that: A first firewall (501) is provided between the main transformer A phase transformer (201) and the external environment, a second firewall (502) is provided between the main transformer A phase transformer (201) and the main transformer B phase transformer (202), a third firewall (503) is provided between the main transformer B phase transformer (202) and the main transformer C phase transformer (203), and a fourth firewall (504) is provided between the main transformer C phase transformer and the external environment; one end of the first oil coupling pipe (301) is arranged to bypass the second firewall (502) and the third firewall (503) in sequence, one end of the second oil coupling pipe (302) is arranged to bypass the second firewall (502) and the first firewall (501) in sequence, and one end of the third oil coupling pipe (303) is arranged to bypass the third firewall (503) and the second firewall (502) in sequence.
10. The device for collecting oil samples in case of power transformer accidents according to claim 9, characterized in that: When taking an oil sample from the main transformer A-phase transformer (201), one end of the first oil coupling pipe (301) is connected to the first oil extraction port of the main transformer A-phase transformer (201), and the other end of the first oil coupling pipe (301) sequentially bypasses the second firewall (502) and the third firewall (503) to extend to the area where the main transformer C-phase transformer (203) is located, and is connected to the first sampling member; when taking an oil sample from the main transformer B-phase transformer (202), one end of the second oil coupling pipe (302) is connected to the second oil extraction port of the main transformer B-phase transformer (202), and the second oil coupling pipe The other end of the third oil connection pipe (302) sequentially bypasses the second fire wall (502) and the first fire wall (501) and extends to the outside of the first fire wall (501), and is connected to the second sampling piece; when the main transformer C phase transformer (203) is taking oil samples, one end of the third oil connection pipe (303) is connected to the third oil extraction port of the main transformer C phase transformer (203), and the other end of the third oil connection pipe (303) sequentially bypasses the third fire wall (503) and the second fire wall (502) and extends to the area where the main transformer A phase transformer (201) is located, and is connected to the third sampling piece.