A gas relay gas collecting box gas taking device and method

Abstract

This invention relates to a gas collection box device and method for a gas relay. The gas collection box device includes a gas collection box, a sealed oil tank, and a drain pump with forward and reverse rotation functions. A gas collection valve and an inlet valve connected to the top of the gas collection box are connected. A drain valve is also connected to the gas collection box, and the drain valve and the sealed oil tank are connected via the drain pump. A gas sensor for detecting gas content is installed inside the gas collection box. Both the gas sensor and the drain pump are electrically connected to a controller. The gas collection box device and method provided by this invention solve the problem that existing gas collection box devices have difficulty allowing gas from the transformer to enter the gas collection box when the amount of gas produced by the decomposition of the oil medium is small.

Description

Technical Field

[0001] This invention relates to the field of power voltage equipment technology, and in particular to a gas collection box gas extraction device and method for a gas relay. Background Technology

[0002] Gas protection is a non-electrical protection measure that responds to internal short-circuit faults in transformers. When a short-circuit fault occurs inside the transformer, the oil medium decomposes and produces gas. When this gas accumulates at the top of the gas relay, it generates a certain pressure, triggering an alarm signal and initiating the operation of the light gas protection. In the event of a severe fault, the oil flow will surge rapidly and impact the gas relay, activating the control circuit and causing the heavy gas protection to activate.

[0003] When a transformer's gas protection system trips, whether it's a heavy or light gas protection activation, gas is generated. Since the gas collecting box is filled with oil, once the oil is discharged, the gas will enter the collecting box from the transformer via the gas relay. Therefore, workers can determine the authenticity of the fault and identify whether it's a protection malfunction by observing the presence of gas inside the gas relay and sampling and analyzing the gas collected in the collecting box. However, when the amount of gas generated by the decomposition of the oil is small, the gas pressure in the conduit between the gas relay and the collecting box is very low, possibly much lower than atmospheric pressure. In this case, even if the oil drain port at the bottom of the collecting box is opened, the oil will not fall due to gravity; instead, it will be drawn in by the pressure difference between the conduit and the atmosphere, preventing gas from the transformer from entering the collecting box. Summary of the Invention

[0004] The main objective of this invention is to propose a gas collection device and method for a gas relay gas collection box, which aims to solve the problem that existing gas collection box gas collection devices have difficulty allowing gas inside the transformer to enter the gas collection box when the amount of gas produced by the decomposition of oil medium is small.

[0005] To achieve the above objectives, the present invention proposes a gas collection box gas extraction device for a gas relay, comprising a gas collection box, a sealed oil tank, and a drain pump with forward and reverse rotation functions. The top of the gas collection box is connected to a gas extraction valve and an inlet valve that can be connected to the gas relay. The gas collection box is also connected to a drain valve, which is connected to the sealed oil tank via the drain pump. A gas sensor for detecting gas content is provided inside the gas collection box. Both the gas sensor and the drain pump are electrically connected to a controller.

[0006] According to some embodiments of the present invention, a three-way connector is also included, through which the oil pump and the sealed oil tank are connected, and a pressure gauge for detecting oil pressure is connected to the three-way connector, the pressure gauge being electrically connected to the controller.

[0007] According to some embodiments of the present invention, a first solenoid valve is further included, wherein the oil discharge valve and the oil discharge pump are connected through the first solenoid valve, the valve of the first solenoid valve is driven by a stepper motor so that the stepper motor controls the opening degree of the valve, and the stepper motor is electrically connected to the controller.

[0008] According to some embodiments of the present invention, a second solenoid valve for connecting to an external oil storage container is also included. An oil inlet pipe and an oil outlet pipe are connected to the sealed oil tank. The second solenoid valve is connected to the sealed oil tank through the oil inlet pipe. The oil discharge pump is connected to the sealed oil tank through the oil outlet pipe. An exhaust valve is connected to the top of the sealed oil tank.

[0009] According to some embodiments of the present invention, both the oil inlet pipe and the oil outlet pipe extend into the sealed oil tank and are disposed near the bottom of the sealed oil tank.

[0010] Furthermore, the present invention also provides a method for gas extraction from a gas relay gas collection box, based on the gas extraction device for a gas relay gas collection box described in any one of the above claims, the method comprising the following steps:

[0011] Upon receiving an alarm signal, the intake valve and the oil drain valve are opened.

[0012] Determine the operating power of the oil discharge pump based on the type of operation of the transformer's gas protection system;

[0013] The oil pump is controlled to rotate forward according to the operating power, so that the oil medium in the gas collection box flows through the oil pump into the sealed oil tank, so that gas can enter the gas collection box from the air inlet valve;

[0014] After the gas content in the gas collection box detected by the gas sensor reaches the preset content, the gas inlet valve is closed and the gas outlet valve is opened.

[0015] The oil pump is controlled to run in reverse at its original operating power, so that the oil medium in the sealed oil tank flows through the oil pump into the gas collection box, thereby forcing the gas out from the gas intake valve;

[0016] After detecting that the gas collection box is full of oil medium, the gas intake valve and the oil discharge valve are closed and the oil discharge pump is stopped.

[0017] According to some embodiments of the present invention, after controlling the oil pump to run in the forward direction, the method further includes:

[0018] The dynamic balance range of pipeline oil pressure between the oil discharge pump and the sealed oil tank is determined based on the type of operation of the transformer gas protection.

[0019] Obtain the current oil pressure value of the pipeline;

[0020] Adjust the valve opening of the first solenoid valve according to the oil pressure dynamic balance range and the current oil pressure value, so that the current oil pressure value is within the oil pressure dynamic balance range.

[0021] According to some embodiments of the present invention, adjusting the valve opening of the first solenoid valve according to the oil pressure dynamic balance range and the current oil pressure value, so that the current oil pressure value is within the oil pressure dynamic balance range, includes:

[0022] Compare the current oil pressure value with the oil pressure dynamic balance range;

[0023] When the current oil pressure value is less than the minimum value of the oil pressure dynamic balance range, the stepper motor is controlled to reduce the valve opening until the current oil pressure value is within the oil pressure dynamic balance range;

[0024] When the current oil pressure value is greater than the maximum value of the oil pressure dynamic balance range, the stepper motor is controlled to increase the valve opening until the current oil pressure value is within the oil pressure dynamic balance range.

[0025] According to some embodiments of the present invention, before opening the intake valve and the drain valve, the method further includes:

[0026] Open the drain valve and control the drain pump to run in the forward direction, so that the oil medium in the air collection box flows through the drain pump into the sealed oil tank, so that the air in all the pipes between the drain valve and the sealed oil tank is discharged into the sealed oil tank;

[0027] After observing that the oil level in the sealed oil tank is higher than the inlet and outlet pipes, the second solenoid valve is opened and the oil pump is reversed to allow the oil medium in the external oil storage container to enter the sealed oil tank.

[0028] After observing that oil medium is flowing out of the vent valve at the top of the sealed oil tank, the oil discharge pump is controlled to stop running and the oil discharge valve and the vent valve are closed.

[0029] According to some embodiments of the present invention, after controlling the oil pump to reverse operation, the method further includes:

[0030] Obtain the current oil pressure value of the pipeline between the oil pump and the sealed oil tank;

[0031] When the current oil pressure value is less than the minimum value of the preset oil pressure range, the drain valve is closed and the second solenoid valve is opened;

[0032] After detecting that the current oil pressure value is within the preset oil pressure range, the oil drain valve is opened.

[0033] The present invention has at least the following beneficial effects:

[0034] In this invention, after the transformer triggers its gas protection, the gas from the decomposition of the oil medium inside the transformer gathers in the gas relay. At this time, the inlet valve and the outlet valve are opened, and the outlet pump rotates forward, driving the oil medium in the gas collection box to be discharged from the outlet valve into the sealed oil tank. Since the gas collection box is almost in a vacuum state after the oil medium is discharged, the gas in the gas relay enters the gas collection box from the inlet valve under the action of air pressure. When the gas sensor in the gas collection box detects that the gas content in the gas collection box has reached the required amount, the inlet valve is closed and the gas sampling valve is opened. The outlet pump rotates in reverse, driving the oil medium in the sealed oil tank to be discharged into the gas collection box until the gas collection box is full, so that the gas in the gas collection box is pushed out from the gas sampling valve for subsequent gas sampling and analysis. This invention uses the forward and reverse rotation of the oil pump to extract and inject oil medium into the gas collecting box, so that even if there is little gas in the transformer, it can enter the gas collecting box under air pressure and be output to the subsequent sampling and analysis process after the gas is collected. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of a gas relay gas collection box gas extraction device provided in an embodiment of the present invention;

[0037] Figure 2 This is a flowchart illustrating the first embodiment of the gas collection box gas extraction method of the gas relay of the present invention;

[0038] Figure 3 This is a schematic flowchart of the second embodiment of the gas extraction method of the present invention;

[0039] Figure 4 This is a schematic flowchart of the third embodiment of the gas extraction method of the present invention;

[0040] Figure 5 This is a schematic flowchart of the fourth embodiment of the gas extraction method of the present invention;

[0041] Figure 6 This is a schematic flowchart of the fifth embodiment of the gas extraction method of the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 100-Gas relay gas collection box gas intake device; 1-Gas collection box; 11-Gas intake valve; 12-Inlet valve; 13-Drain valve; 14-Observation window; 2-Sealed oil tank; 21-Inlet pipe; 22-Outlet pipe; 3-Drain pump; 4-T-connector; 5-Pressure gauge; 6-First solenoid valve; 7-Second solenoid valve; 8-Exhaust valve; 200-External oil storage container. Detailed Implementation

[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0046] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0047] This invention provides a gas collection device and method for a gas relay gas collection box. Figures 1 to 6 This is a specific embodiment of a gas relay gas collection box gas extraction device and method provided by the present invention.

[0048] like Figure 1As shown, this embodiment of the invention provides a gas collection box gas extraction device 100 for a gas relay, including a gas collection box 1, a sealed oil tank 2, and an oil discharge pump 3 with forward and reverse rotation functions. The top of the gas collection box 1 is connected to a gas extraction valve 11 and an air inlet valve 12 that can communicate with the gas relay. An oil discharge valve 13 is also connected to the gas collection box 1. The oil discharge valve 13 and the sealed oil tank 2 are connected through the oil discharge pump 3. A gas sensor for detecting gas content is provided inside the gas collection box 1. The gas sensor and the oil discharge pump 3 are both electrically connected to a controller.

[0049] In this invention, after the transformer experiences a gas protection activation, the gas from the decomposition of the oil medium inside the transformer gathers in the gas relay. At this time, the inlet valve 12 and the outlet valve 13 are opened, and the outlet pump 3 rotates forward, driving the oil medium in the gas collection box 1 to be discharged from the outlet valve 13 into the sealed oil tank 2. Since the gas collection box 1 is almost in a vacuum state after the oil medium is discharged, the gas in the gas relay enters the gas collection box 1 from the inlet valve 12 under the action of air pressure. When the gas sensor in the gas collection box 1 detects that the gas content in the gas collection box 1 has reached the required amount, the inlet valve 12 is closed and the gas intake valve 11 is opened. The outlet pump 3 rotates in reverse, driving the oil medium in the sealed oil tank 2 to be discharged into the gas collection box 1 until the gas collection box 1 is full, so that the gas in the gas collection box 1 is pushed out from the gas intake valve 11 for subsequent gas sampling and analysis. The present invention uses the forward and reverse rotation of the oil pump 3 to extract and inject the oil medium in the gas collecting box 1, so that even if the gas in the transformer is small, it can enter the gas collecting box 1 under the action of air pressure and be output to the subsequent sampling and analysis process after the gas is collected.

[0050] Specifically, in some embodiments, such as Figure 1 As shown, the gas collection box 1 is provided with an observation window 14. When a large amount of gas enters the gas collection box 1, bubbles will rise from the surface of the remaining oil medium in the gas collection box 1. When the gas sensor malfunctions, this can be used to roughly determine whether the amount of gas collected in the gas collection box 1 is sufficient.

[0051] To facilitate the adjustment of oil pressure in the pipeline, in some embodiments, such as Figure 1As shown, the gas relay gas collection box sampling device 100 also includes a three-way connector 4. The oil pump 3 and the sealed oil tank 2 are connected through the three-way connector 4. A pressure gauge 5 for detecting oil pressure is connected to the three-way connector 4, and the pressure gauge 5 is electrically connected to the controller. With this configuration, the pressure gauge 5 monitors the oil pressure in the pipeline between the oil pump 3 and the sealed oil tank 2 in real time. If the oil pressure is too low, it indicates that the oil medium in the sealed oil tank 2 is insufficient. If the oil pump 3 continues to operate, air may enter the pipeline and be discharged into the gas collection box 1 through the oil discharge valve 13, thereby contaminating the gas in the gas collection box 1 and affecting the subsequent gas sampling and analysis results. If the oil pressure is too high, it may cause the pipeline to rupture. Therefore, the pipeline oil pressure is adjusted in real time according to the oil pressure value detected by the pressure gauge 5 to ensure the normal operation of the device.

[0052] When the oil flow velocity and pipeline oil pressure are in a dynamic equilibrium, the flow resistance of the oil medium can be reduced, achieving efficient and stable operation of the device. In some embodiments, such as... Figure 1 As shown, the gas relay gas collection box gas extraction device 100 also includes a first solenoid valve 6. The oil discharge valve 13 and the oil discharge pump 3 are connected through the first solenoid valve 6. The valve of the first solenoid valve 6 is driven by a stepper motor so that the stepper motor controls the opening degree of the valve. The stepper motor is electrically connected to the controller. With this configuration, the dynamic oil pressure balance range is related to the gas volume accumulated in the gas relay, and the gas volume is directly related to the transformer gas protection action type. Therefore, the dynamic oil pressure balance ranges corresponding to heavy gas protection actions and light gas protection actions are different. When the controller receives an alarm signal, it can determine the transformer gas protection action type based on the message content, and then determine the dynamic oil pressure balance range. Next, after obtaining the current oil pressure value of the pipeline through the pressure gauge 5, if the current oil pressure value is greater than the maximum value of the dynamic oil pressure balance range, the valve opening of the first solenoid valve 6 is increased by controlling the stepper motor to reduce the oil flow velocity, thereby reducing the oil pressure in the pipeline. If the current oil pressure value is less than the minimum value of the dynamic oil pressure balance range, the valve opening of the first solenoid valve 6 is decreased by controlling the stepper motor to increase the oil flow velocity, thereby increasing the oil pressure in the pipeline, thus adjusting the pipeline oil pressure to be within the dynamic oil pressure balance range.

[0053] Furthermore, in some embodiments, such as Figure 1As shown, the gas relay gas collection box gas extraction device 100 also includes a second solenoid valve 7 for connecting to an external oil storage container 200. The sealed oil tank 2 is connected to an oil inlet pipe 21 and an oil outlet pipe 22. The second solenoid valve 7 is connected to the sealed oil tank 2 through the oil inlet pipe 21. The oil discharge pump 3 is connected to the sealed oil tank 2 through the oil outlet pipe 22. An exhaust valve 8 is connected to the top of the sealed oil tank 2. With this configuration, when the pressure gauge 5 detects that the oil pressure in the pipeline between the oil discharge pump 3 and the sealed oil tank 2 is too low, it indicates that the oil medium in the sealed oil tank 2 is insufficient. If the oil discharge pump 3 continues to operate, air may enter the pipeline. Therefore, by closing the oil discharge valve 13 and opening the second solenoid valve 7, the oil medium in the external oil storage container 200 is input into the sealed oil tank 2, thereby increasing the oil pressure in the pipeline. Meanwhile, the top of the sealed oil tank 2 is connected to the exhaust valve 8. As the oil medium in the sealed oil tank 2 increases, the air in the sealed oil tank 2 can be pushed upward and discharged from the exhaust valve 8.

[0054] Furthermore, in some embodiments, such as Figure 1 As shown, both the oil inlet pipe 21 and the oil outlet pipe 22 extend into the sealed oil tank 2 and are positioned near the bottom of the sealed oil tank 2. This arrangement ensures that the oil medium in the sealed oil tank 2 only needs to be above the openings of the oil inlet pipe 21 and the oil outlet pipe 22 to achieve an oil seal effect. This prevents air from entering the pipe through the oil outlet pipe 22, and the oil medium does not need to fill the entire sealed oil tank 2, reducing oil medium waste.

[0055] Those skilled in the art will understand that the above-described structure does not constitute a limitation on the gas relay gas collection box gas extraction device 100, and may include more or fewer components than described above, or combine certain components, or have different component arrangements.

[0056] like Figure 2 As shown, this embodiment of the invention provides a method for obtaining gas from a gas relay gas collection box 1, including the following steps:

[0057] Step S40: After receiving the alarm signal, open the intake valve 12 and the oil drain valve 13.

[0058] It should be noted that when an alarm signal is received, it indicates that the transformer has activated either heavy or light gas protection. Subsequently, the oil medium inside the transformer will decompose to produce gas. Therefore, it is necessary to open the air inlet valve 12 to allow gas to enter the gas collection box 1. At the same time, since the gas collection box 1 is initially filled with oil medium and there is no space to accommodate gas, it is necessary to open the oil drain valve 13 to drain the oil medium.

[0059] Step S50: Determine the operating power of oil pump 3 according to the type of operation of the transformer gas protection.

[0060] It should be noted that when the controller receives an alarm signal, it can determine the type of transformer gas protection action based on the message content.

[0061] It should be noted that when a transformer experiences a heavy gas protection operation, a larger amount of gas is released from the decomposition of the internal oil medium, while when a transformer experiences a light gas protection operation, less gas is released from the decomposition of the internal oil medium. When the gas exerts a thrust on the oil medium in the gas collection box 1, the thrust, together with the driving force of the oil discharge pump 3, causes the oil medium to be discharged from the oil discharge valve 13. The amount of gas varies, and the thrust applied also varies, thus the driving force required by the oil discharge pump 3 also varies. Therefore, the operating power of the oil discharge pump 3 varies for different types of gas protection operations.

[0062] It should be noted that when the transformer experiences a heavy gas protection activation, the first preset power is used as the operating power of the oil drain pump 3; when the transformer experiences a light gas protection activation, the second preset power is used as the operating power of the oil drain pump 3; wherein, the first preset power is less than the second preset power.

[0063] Step S60: Control the oil discharge pump 3 to run in the forward direction according to the operating power, so that the oil medium in the gas collection box 1 flows through the oil discharge pump 3 into the sealed oil tank 2, so that the gas can enter the gas collection box 1 from the air inlet valve 12.

[0064] It should be noted that the oil medium is extracted from the gas collection box 1 by the thrust of the gas and the driving force of the oil pump 3, so that the oil medium is temporarily stored in the sealed oil tank 2.

[0065] Step S100: After the gas content in the gas collection box 1 detected by the gas sensor reaches the preset content, the gas inlet valve 12 is closed and the gas outlet valve 11 is opened.

[0066] It should be noted that when the gas content is detected to reach the preset content, it means that the gas collection box 1 has collected enough gas. At this time, the gas inlet valve 12 is closed and the gas outlet valve 11 is opened, so that the gas is output from the gas outlet valve 11 to the subsequent gas sampling and analysis process.

[0067] Step S110: Control the oil discharge pump 3 to run in reverse at the original operating power, so that the oil medium in the sealed oil tank 2 flows through the oil discharge pump 3 into the gas collection box 1, so as to force the gas out from the gas intake valve 11.

[0068] It should be noted that since the air intake valve 11 is already open, and the density of the gas is less than that of the oil medium, the oil discharge pump 3 only needs to ensure that it can drive the oil medium into the air collection box 1. Therefore, the actual operating power required by the oil discharge pump 3 is relatively small. However, this application chooses to control the oil discharge pump 3 to run in reverse at the original operating power, so that the operating power is the same when rotating forward and in reverse. This makes the torque output by the motor and the axial and radial loads close when rotating forward and in reverse, reducing the sudden change in mechanical stress caused by the direction switching, extending the life of bearings, seals and impellers. Moreover, when the power is the same, the impact of forward and reverse switching on the power grid is small, reducing the configuration complexity of the frequency converter or soft starter.

[0069] Step S150: After detecting that the gas collection box 1 is full of oil medium, close the gas intake valve 11 and the oil discharge valve 13 and control the oil discharge pump 3 to stop running.

[0070] It should be noted that a liquid level sensor can be installed in the gas collection box 1 to detect the liquid level of the oil medium in the gas collection box 1. When the gas collection box 1 is detected to be full of oil medium, it means that all the gas in the gas collection box 1 has been output. At this time, the gas intake valve 11 and the oil discharge valve 13 are closed to prevent the oil medium from entering the gas intake valve 11.

[0071] In this invention, the gas extraction method of the gas relay gas collection box 1 includes the following steps: after receiving an alarm signal, the inlet valve 12 and the drain valve 13 are opened; the operating power of the drain pump 3 is determined according to the transformer gas protection action type; the drain pump 3 is controlled to run in the forward direction according to the operating power, so that the oil medium in the gas collection box 1 flows through the drain pump 3 into the sealed oil tank 2, so that gas can enter the gas collection box 1 from the inlet valve 12; after the gas content in the gas collection box 1 detected by the gas sensor reaches the preset content, the inlet valve 12 is closed and the gas extraction valve 11 is opened; the drain pump 3 is controlled to run in the reverse direction at the original operating power, so that the oil medium in the sealed oil tank 2 flows through the drain pump 3 into the gas collection box 1, so that gas is forced out from the gas extraction valve 11; after detecting that the gas collection box 1 is full of oil medium, the gas extraction valve 11 and the drain valve 13 are closed and the drain pump 3 is controlled to stop running. The gas collection box 1 gas extraction method provided by the present invention solves the problem that the gas inside the transformer is difficult to enter the gas collection box 1 when the gas produced by the decomposition of oil medium is small in the existing gas collection box 1 gas extraction equipment.

[0072] refer to Figure 3 , Figure 3 This is a schematic flowchart of the second embodiment of the gas extraction method of the present invention.

[0073] Based on the first embodiment described above, the gas sampling method in this embodiment further includes, after step S60:

[0074] Step S70: Determine the dynamic balance range of pipeline oil pressure between the oil pump 3 and the sealed oil tank 2 according to the transformer gas protection action type.

[0075] It should be noted that, since the dynamic balance range of oil pressure is related to the gas volume accumulated in the gas relay, and the gas volume is directly related to the type of operation of the transformer gas protection, the dynamic balance range of oil pressure corresponding to heavy gas protection operation and light gas protection operation is different.

[0076] Specifically, when a light gas protection operation occurs, the gas volume accumulated in the gas relay is generally 250~350cm³, while when a heavy gas protection operation occurs, the gas volume accumulated in the gas relay is 2500~3500cm³.

[0077] Step S80: Obtain the current oil pressure value of the pipeline.

[0078] It should be noted that the current oil pressure value of the pipeline between the oil pump 3 and the sealed oil tank 2 can be detected by pressure gauge 5.

[0079] Step S90: Adjust the valve opening of the first solenoid valve 6 according to the oil pressure dynamic balance range and the current oil pressure value, so that the current oil pressure value is within the oil pressure dynamic balance range.

[0080] It should be noted that by adjusting the valve opening of the first solenoid valve 6, the oil flow rate can be adjusted, thereby adjusting the oil pressure value of the pipeline, so that the oil pressure value of the pipeline is within the dynamic balance range of oil pressure.

[0081] In this embodiment, the dynamic balance range of the pipeline oil pressure between the oil pump 3 and the sealed oil tank 2 is first determined according to the transformer gas protection action type. Then, the current oil pressure value of the pipeline is obtained. Finally, the valve opening of the first solenoid valve 6 is adjusted according to the dynamic balance range of oil pressure and the current oil pressure value, thereby adjusting the oil flow rate to adjust the oil pressure value of the pipeline, so that the current oil pressure value is within the dynamic balance range of oil pressure.

[0082] refer to Figure 4 , Figure 4 This is a schematic flowchart of the third embodiment of the gas extraction method of the present invention.

[0083] Based on the second embodiment described above, the gas sampling method in this embodiment includes the following in step S90:

[0084] Step S91: Compare the current oil pressure value with the oil pressure dynamic balance range.

[0085] It should be noted that if the current oil pressure value is within the oil pressure dynamic balance range, there is no need to adjust the valve opening of the first solenoid valve 6.

[0086] Step S92: When the current oil pressure value is less than the minimum value of the oil pressure dynamic balance range, control the stepper motor to reduce the valve opening until the current oil pressure value is within the oil pressure dynamic balance range.

[0087] It should be noted that, since the stepper motor is connected to the valve drive, the valve can be driven to move radially along the opening of the first solenoid valve 6, thereby realizing the adjustment of the valve opening.

[0088] Step S93: When the current oil pressure value is greater than the maximum value of the oil pressure dynamic balance range, control the stepper motor to increase the valve opening until the current oil pressure value is within the oil pressure dynamic balance range.

[0089] It should be noted that by reducing the valve opening, the oil flow rate can be increased, thereby increasing the oil pressure in the pipeline; conversely, by increasing the valve opening, the oil flow rate can be decreased, thereby decreasing the oil pressure in the pipeline.

[0090] In this embodiment, the current oil pressure value is compared with the oil pressure dynamic balance range. When the current oil pressure value is less than the minimum value of the oil pressure dynamic balance range, the stepper motor is controlled to reduce the valve opening until the current oil pressure value is within the oil pressure dynamic balance range. When the current oil pressure value is greater than the maximum value of the oil pressure dynamic balance range, the stepper motor is controlled to increase the valve opening until the current oil pressure value is within the oil pressure dynamic balance range.

[0091] refer to Figure 5 , Figure 5 This is a schematic flowchart of the fourth embodiment of the gas extraction method of the present invention.

[0092] Based on the first embodiment described above, the gas sampling method in this embodiment further includes the following steps before step S40:

[0093] Step S10: Open the oil drain valve 13 and control the oil drain pump 3 to run in the forward direction, so that the oil medium in the air collection box 1 flows through the oil drain pump 3 into the sealed oil tank 2, so that the air in all the pipes between the oil drain valve 13 and the sealed oil tank 2 is discharged into the sealed oil tank 2.

[0094] It should be noted that after the various components of the gas relay gas collection box gas extraction device 100 are installed, there is air in the pipeline. It is necessary to first exhaust all the air to avoid contaminating the gas collected by the gas collection box 1. By extracting a small amount of oil medium from the gas collection box 1 into the sealed oil tank 2, the air in all the pipelines between the oil drain valve 13 and the sealed oil tank 2 can be discharged into the sealed oil tank 2.

[0095] Step S20: After observing that the oil medium level in the sealed oil tank 2 is higher than the openings of the oil inlet pipe 21 and the oil outlet pipe 22, the second solenoid valve 7 is opened and the oil discharge pump 3 is controlled to run in reverse, so that the oil medium in the external oil storage container 200 enters the sealed oil tank 2.

[0096] It should be noted that when the oil level in the sealed oil tank 2 is observed to be higher than the openings of the oil inlet pipe 21 and the oil outlet pipe 22, it indicates that the oil seal has been achieved in the sealed oil tank 2. At this time, the oil discharge pump 3 is controlled to run in reverse, so that the oil medium in the sealed oil tank 2 returns to the gas collection box 1. At the same time, the oil medium in the external oil storage container 200 is drawn into the sealed oil tank 2. During this process, air cannot enter the oil discharge pump 3 through the oil outlet pipe 22.

[0097] Step S30: After observing that oil medium is flowing out of the vent valve 8 at the top of the sealed oil tank 2, control the oil discharge pump 3 to stop running and close the oil discharge valve 13 and the vent valve 8.

[0098] It should be noted that when oil medium is observed flowing out of the vent valve 8 at the top of the sealed oil tank 2, it indicates that both the air collection box 1 and the sealed oil tank 2 are filled with oil medium, and all pipes between the oil drain valve 13 and the sealed oil tank 2 are also filled with oil medium, and there is no air.

[0099] In this embodiment, firstly, the oil drain valve 13 is opened and the oil drain pump 3 is controlled to run in the forward direction, allowing the oil medium in the gas collection box 1 to flow through the oil drain pump 3 into the sealed oil tank 2, so that the air in all pipes between the oil drain valve 13 and the sealed oil tank 2 is discharged into the sealed oil tank 2. Then, after observing that the oil medium level in the sealed oil tank 2 is higher than the openings of the oil inlet pipe 21 and the oil outlet pipe 22, the second solenoid valve 7 is opened and the oil drain pump 3 is controlled to run in the reverse direction, allowing the oil medium in the external oil storage container 200 to enter the sealed oil tank 2. Finally, after observing that the oil medium flows out of the exhaust valve 8 at the top of the sealed oil tank 2, the oil drain pump 3 is controlled to stop running and the oil drain valve 13 and the exhaust valve 8 are closed, thereby realizing the discharge of air from all components in the gas relay gas collection box gas extraction device 100.

[0100] refer to Figure 6 , Figure 6This is a schematic flowchart of the fifth embodiment of the gas extraction method of the present invention.

[0101] Based on the first embodiment described above, the gas sampling method of this embodiment further includes, after step S110:

[0102] Step S120: Obtain the current oil pressure value of the pipeline between the oil pump 3 and the sealed oil tank 2.

[0103] Step S130: When the current oil pressure value is less than the minimum value of the preset oil pressure range, close the oil drain valve 13 and open the second solenoid valve 7.

[0104] It should be noted that when the current oil pressure value is less than the minimum value of the preset oil pressure range, it indicates that the oil medium in the sealed oil tank 2 is insufficient. If the oil discharge pump 3 continues to operate, air may enter the pipeline and be discharged into the gas collection box 1 through the oil discharge valve 13, thereby contaminating the gas in the gas collection box 1 and affecting the subsequent gas sampling and analysis results. Therefore, the oil discharge valve 13 is closed and the second solenoid valve 7 is in the open state. The oil discharge pump 3 runs normally in reverse, which can draw the oil medium in the external oil storage container 200 connected to the second solenoid valve 7 into the sealed oil tank 2. At this time, since the oil discharge valve 13 is closed, the oil medium cannot enter the gas collection box 1, causing the oil pressure value of the pipeline to increase.

[0105] Step S140: After detecting that the current oil pressure value is within the preset oil pressure range, open the oil drain valve 13.

[0106] It should be noted that when the current oil pressure value is detected to be within the preset oil pressure range, the oil drain valve 13 is opened to allow the oil medium to enter the air collection box 1, thus preventing excessive oil pressure that could lead to pipeline rupture.

[0107] In this embodiment, the current oil pressure value of the pipeline between the oil pump 3 and the sealed oil tank 2 is first obtained. When the current oil pressure value is less than the minimum value of the preset oil pressure range, the oil drain valve 13 is closed and the second solenoid valve 7 is opened. After detecting that the current oil pressure value is within the preset oil pressure range, the oil drain valve 13 is opened.

[0108] It should be understood that although the steps in the flowcharts of this application's embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some of the steps in the figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least a portion of the sub-steps or stages of other steps.

[0109] It should be understood that the above are merely illustrative examples and do not constitute any limitation on the technical solutions of the present invention. In specific applications, those skilled in the art can make settings as needed, and the present invention does not impose any restrictions on this.

[0110] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of this invention. In practical applications, those skilled in the art can select some or all of the workflow to achieve the purpose of this embodiment according to actual needs, and no restrictions are imposed here.

[0111] Furthermore, it should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0112] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gas collection box gas extraction device for a gas relay, characterized in that, It includes a gas collection box, a sealed oil tank, and an oil discharge pump with forward and reverse rotation functions. The top of the gas collection box is connected to a gas intake valve and an intake valve connected to a gas relay. The gas collection box is also connected to an oil discharge valve. The oil discharge valve and the sealed oil tank are connected through the oil discharge pump. The gas collection box is equipped with a gas sensor for detecting gas content. The gas sensor and the oil discharge pump are both electrically connected to the controller. It also includes a three-way connector, through which the oil pump and the sealed oil tank are connected. A pressure gauge for detecting oil pressure is connected to the three-way connector, and the pressure gauge is electrically connected to the controller. It also includes a first solenoid valve, through which the oil discharge valve and the oil discharge pump are connected. The valve of the first solenoid valve is driven by a stepper motor so that the stepper motor controls the opening degree of the first solenoid valve. The stepper motor is electrically connected to the controller. When the controller receives an alarm signal, it determines the type of transformer gas protection action based on the message content, and then determines the dynamic balance range of oil pressure. Next, it obtains the current oil pressure value of the pipeline through the pressure gauge. If the current oil pressure value is greater than the maximum value of the dynamic balance range, it controls the opening of the first solenoid valve to increase through the stepper motor, thereby reducing the oil flow velocity and thus decreasing the oil pressure in the pipeline. If the current oil pressure value is less than the minimum value of the dynamic balance range, it controls the opening of the first solenoid valve to decrease through the stepper motor, thereby increasing the oil flow velocity and thus increasing the oil pressure in the pipeline. This is done to adjust the pipeline oil pressure to be within the dynamic balance range.

2. The gas relay gas collection box gas extraction device as described in claim 1, characterized in that, It also includes a second solenoid valve for connecting to an external oil storage container. The sealed oil tank is connected to an oil inlet pipe and an oil outlet pipe. The second solenoid valve is connected to the sealed oil tank through the oil inlet pipe. The oil discharge pump is connected to the sealed oil tank through the oil outlet pipe. An exhaust valve is connected to the top of the sealed oil tank.

3. The gas relay gas collection box gas extraction device as described in claim 2, characterized in that, Both the oil inlet pipe and the oil outlet pipe extend into the sealed oil tank and are located near the bottom of the sealed oil tank.

4. A method for extracting gas from a gas relay gas collection box, comprising extracting gas using the gas relay gas collection box gas extraction device as described in any one of claims 2 to 3, characterized in that, Includes the following steps: After receiving the alarm signal, the controller opens the air intake valve and the oil drain valve, and determines the type of transformer gas protection action based on the message content. Determine the operating power of the oil discharge pump based on the type of operation of the transformer's gas protection system; The oil pump is controlled to rotate forward according to the operating power, so that the oil medium in the gas collection box flows through the oil pump into the sealed oil tank, so that gas can enter the gas collection box from the air inlet valve; After the gas content in the gas collection box detected by the gas sensor reaches the preset content, the gas inlet valve is closed and the gas outlet valve is opened. The oil pump is controlled to run in reverse with the same operating power as the forward operation of the oil pump, so that the oil medium in the sealed oil tank flows through the oil pump into the gas collection box, so as to force the gas out from the gas intake valve; After detecting that the gas collection box is full of oil medium, the gas intake valve and the oil discharge valve are closed and the oil discharge pump is stopped. After controlling the oil pump to rotate forward according to the operating power, the process also includes: The dynamic balance range of pipeline oil pressure between the oil discharge pump and the sealed oil tank is determined according to the type of operation of the transformer gas protection. The current oil pressure value of the pipeline between the oil pump and the sealed oil tank is obtained by a pressure gauge; Adjust the valve opening of the first solenoid valve according to the oil pressure dynamic balance range and the current oil pressure value, so that the current oil pressure value is within the oil pressure dynamic balance range.

5. The gas collection box extraction method for gas relays as described in claim 4, characterized in that, The step of adjusting the valve opening of the first solenoid valve according to the oil pressure dynamic balance range and the current oil pressure value, so that the current oil pressure value is within the oil pressure dynamic balance range, includes: Compare the current oil pressure value with the oil pressure dynamic balance range; When the current oil pressure value is less than the minimum value of the oil pressure dynamic balance range, the stepper motor is controlled to reduce the valve opening of the first solenoid valve until the current oil pressure value is within the oil pressure dynamic balance range. When the current oil pressure value is greater than the maximum value of the oil pressure dynamic balance range, the stepper motor is controlled to increase the valve opening of the first solenoid valve until the current oil pressure value is within the oil pressure dynamic balance range.

6. The gas collection box gas extraction method of the gas relay as described in claim 4, characterized in that, Before the controller opens the intake valve and exhaust valve after receiving the alarm signal, it also includes: Open the drain valve and control the drain pump to run in the forward direction, so that the oil medium in the air collection box flows through the drain pump into the sealed oil tank, so that the air in all the pipes between the drain valve and the sealed oil tank is discharged into the sealed oil tank; After observing that the oil level in the sealed oil tank is higher than the inlet and outlet pipes, the second solenoid valve is opened and the oil pump is reversed to allow the oil medium in the external oil storage container to enter the sealed oil tank. After observing that oil medium is flowing out of the vent valve at the top of the sealed oil tank, the oil discharge pump is controlled to stop running and the oil discharge valve and the vent valve are closed.

7. The gas collection box gas extraction method of the gas relay as described in claim 4, characterized in that, After controlling the oil pump to run in reverse at the same operating power as the forward-rotating oil pump, the method further includes: The current oil pressure value of the pipeline between the oil pump and the sealed oil tank is obtained by a pressure gauge; When the current oil pressure value is less than the minimum value of the preset oil pressure range, the oil drain valve is closed and the second solenoid valve is opened; After detecting that the current oil pressure value is within the preset oil pressure range, the oil drain valve is opened.

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