Oil extraction device for on-load tap-changer of main transformer

Abstract

The utility model discloses an oil taking device for an on-load tap-changer of a main transformer, which comprises an oil drainage component detachably and fixedly connected with an oil drainage pipe of a switch oil chamber and comprises an oil drainage pipeline; the oil return assembly is detachably and fixedly connected with the oil inlet pipe of the switch oil chamber and comprises an oil return pipeline; the circulating device is used for circulating detained oil of the oil discharge pipe to the switch oil chamber and comprises a circulating pipeline, and the circulating pipeline is detachably and fixedly communicated with the oil discharge pipeline and the oil return pipeline; the sampling valve is arranged on the oil drainage pipeline and is used for being operated to be opened to obtain an oil sample of the switch oil chamber after the detained oil circulates to the switch oil chamber; according to the main transformer on-load tap-changer oil sampling device, during oil sampling, the influence of detained oil on the sampling result can be reduced to the maximum extent, the oil level in the switch oil chamber can be basically kept unchanged, the whole process is easy to operate, oil sampling equipment does not need to be arranged for each transformer, and the oil sampling efficiency is improved. And the early-stage investment and the later-stage maintenance cost are reduced.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to an oil sampling device for an on-load tap changer of a main transformer. Background Technology

[0002] To ensure the reliable operation of the on-load tap changer of the transformer, it is necessary to periodically sample the insulating oil inside the on-load tap changer for testing. Oil sampling is performed through the drain pipe outside the on-load tap changer's oil chamber. However, the existing drain pipe for sampling is quite long, and the insulating oil within it is stagnant, forming a stagnant oil zone that does not accurately reflect the actual condition of the insulating oil inside the on-load tap changer's oil chamber. To ensure accurate test results, the stagnant oil in the drain pipe must be drained before sampling. This process causes a temporary drop in the oil level inside the on-load tap changer's oil chamber, potentially requiring oil replenishment. Furthermore, the entire sampling process is cumbersome and inconvenient to operate.

[0003] Therefore, it is necessary to improve the oil sampling method of the on-load tap changer of the main transformer in the existing technology. When sampling oil, the impact of residual oil on the sampling results can be minimized, the oil level in the switch oil chamber can be kept basically unchanged, and the whole process is simple to operate. There is no need to equip each transformer with oil sampling equipment, thus reducing the initial investment and subsequent maintenance costs. Summary of the Invention

[0004] In view of this, the purpose of this utility model is to provide an oil sampling device for on-load tap changers of main transformers. When sampling oil, it can minimize the impact of residual oil on the sampling results and keep the oil level in the switch oil chamber basically unchanged. Moreover, the whole process is simple to operate and does not require each transformer to be equipped with an oil sampling device, thus reducing the initial investment and subsequent maintenance costs.

[0005] The present invention relates to an on-load tap changer oil sampling device for main transformers, comprising:

[0006] The oil drain assembly is detachably and fixedly connected to the oil drain pipe of the switch oil chamber, including the oil drain line;

[0007] The oil return assembly is detachably and fixedly connected to the oil inlet pipe of the switch oil chamber, including the oil return pipeline;

[0008] A circulation device for circulating the stagnant oil in the drain pipe to the switch oil chamber, including a circulation pipeline, wherein the circulation pipeline is detachably and fixedly connected to the drain pipe and the return pipe;

[0009] A sampling valve is installed on the oil drain line and is used to open when stagnant oil circulates to the switch oil chamber to obtain an oil sample from the switch oil chamber.

[0010] Furthermore, the oil drain assembly also includes a fixing component I and an oil drain valve. The fixing component I is used to fix it to the oil drain pipe, and the oil drain valve is located above the oil drain pipe relative to the sampling valve.

[0011] Furthermore, the oil return assembly also includes an exhaust oil chamber and an exhaust valve. The exhaust oil chamber is connected to the end of the oil return pipeline, and the exhaust valve can be operated to open to discharge the gas in the exhaust oil chamber after the oil fills the exhaust oil chamber.

[0012] Furthermore, the oil return assembly also includes a fixing component II, which is used to fix the exhaust oil chamber to the oil inlet pipe.

[0013] Furthermore, the circulation device includes a circulation pump, which is disposed on the circulation pipeline.

[0014] Furthermore, the circulation device also includes a control unit for controlling the flow rate of the circulation pump.

[0015] Furthermore, the fixing component I and fixing component II are fixing flanges.

[0016] Furthermore, the circulation pipeline is a PVC transparent steel wire hose.

[0017] Furthermore, an oil drain valve is installed on the oil drain pipe, and an oil return valve is installed on the oil inlet pipe.

[0018] Furthermore, the circulation device is equipped with a switch, a display screen, and a flow meter.

[0019] The beneficial effects of this utility model are as follows: The on-load tap changer oil sampling device of this utility model is equipped with an oil drain component and an oil return component that are detachably connected to the oil drain pipe and oil inlet pipe of the switch oil chamber, respectively. Compared with the prior art, which requires a fixed oil sampling device for each transformer, this greatly reduces the initial investment and subsequent maintenance costs. At the same time, a circulation pipeline is set up to connect the oil drain component and the oil return component, so that the oil remaining in the drain pipe can be circulated back to the switch oil chamber before oil sampling. Then, the oil in the switch oil chamber is drained and sampled, which can minimize the impact of the oil remaining on the sampling results. In addition, since the oil remaining is circulated back to the switch oil chamber, the oil level in the switch oil chamber can remain basically unchanged, so there is no need to replenish the oil. The entire oil sampling process is simple to operate and has high work efficiency. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1 This is a schematic diagram of the structure of this utility model in use;

[0022] The above figures include the following reference numerals:

[0023] 1. Oil drain assembly; 101. Oil drain valve; 102. Fixing component I; 103. Oil drain pipeline; 2. Oil return assembly; 201. Oil return pipeline; 202. Exhaust oil chamber; 203. Exhaust valve; 204. Fixing component II; 3. Oil drain pipe; 301. Oil drain valve; 4. Oil inlet pipe; 401. Oil return valve; 5. Circulation device; 501. Circulation pipeline; 502. Switch; 503. Flow meter; 504. Display screen; 6. Sampling valve. Detailed Implementation

[0024] Figure 1 This is a schematic diagram of the structure of the present invention, as shown below. Figure 1 As shown: The on-load tap changer oil sampling device for the main transformer in this embodiment includes:

[0025] The oil drain assembly 1 is detachably and fixedly connected to the oil drain pipe 3 of the switch oil chamber, including the oil drain pipe 103; the on-load tap changer body is provided with an oil chamber, and the switch oil chamber is correspondingly provided with an oil drain pipe and an oil inlet pipe, which is an existing structure and will not be described in detail here. The oil drain pipe 103 can be connected to the oil drain pipe 3 through a flange, which is not shown in the switch oil chamber diagram.

[0026] The oil return assembly 2 is detachably and fixedly connected to the oil inlet pipe 4 of the switch oil chamber, including the oil return line 201; the oil return line 201 can be connected to the oil inlet pipe 4 through a flange.

[0027] The circulation device 5 is used to circulate the stagnant oil in the drain pipe 3 to the switch oil chamber. It includes a circulation pipe 501, which is detachably and fixedly connected to the drain pipe 103 and the return pipe 201. The detachable and fixed connection of the circulation pipe 501 to the drain pipe 103 and the return pipe 201 facilitates the disassembly and installation of the entire oil extraction device. When the circulation pipe 501 is connected to the drain pipe 103 and the return pipe 201 respectively, the stagnant oil in the drain pipe 3 can be circulated back to the switch oil chamber through the circulation pipe 501, thereby preventing the oil level in the switch oil chamber from dropping too quickly.

[0028] The sampling valve 6 is installed on the oil drain line 103 and can be opened to obtain an oil sample from the switch oil chamber after the stagnant oil circulates back to the switch oil chamber. In this structure, after the stagnant oil flows through the circulation line 501 and the return line 201 and circulates back to the switch oil chamber, the sampling valve 6 installed on the oil drain line 103 is opened to take an oil sample, thereby minimizing the impact of stagnant oil on the sampling results.

[0029] In existing technologies, to ensure accurate test results, the oil remaining in the drain pipe of the on-load tap changer oil chamber needs to be drained before sampling. This process causes a short-term drop in the oil level in the on-load tap changer oil chamber, potentially requiring oil replenishment. Furthermore, the entire sampling process is cumbersome and inconvenient to operate. The oil sampling device for the on-load tap changer of this invention features a drain assembly 1 and a return assembly 2, which are detachably connected to the drain pipe 3 and inlet pipe 4 of the switch oil chamber, respectively. Compared to existing technologies, this method addresses the issue of oil level drops in the on-load tap changer oil chamber for each transformer. The fixed oil sampling device can greatly reduce the initial investment and subsequent maintenance costs. At the same time, the circulation pipeline 501 connects the oil draining component 1 and the oil return component 2, so that the oil remaining in the drain pipe 3 can be circulated back to the switch oil chamber before oil sampling. Then, the oil in the switch oil chamber is drained and sampled, which can minimize the impact of the oil remaining on the sampling results. At the same time, since the oil remaining is circulated back to the switch oil chamber, the oil level in the switch oil chamber can remain basically unchanged, so there is no need to replenish the oil. The entire oil sampling process is simple to operate and highly efficient.

[0030] In this embodiment, the oil drain assembly 1 further includes a fixing member I 102 and an oil drain valve 101. The fixing member I 102 is used for fixed connection with the oil drain pipe 3. The oil drain valve 101 is located above the oil drain pipeline 103 relative to the sampling valve 6. The oil drain valve 101 and the sampling valve 6 are applications of existing technology and will not be described in detail here. The fixing member I 102 can be a fixing flange. By setting the fixing member I 102 to be detachably fixedly connected to the oil inlet pipe 4, it is convenient to install the entire oil sampling device. The oil drain valve 101 is located above the oil drain pipeline 103 relative to the oil drain valve (up and down are relative to). Figure 1 (Up and down directions in the middle).

[0031] In this embodiment, the oil return assembly 2 further includes an exhaust oil chamber 202 and an exhaust valve 203. The exhaust oil chamber 202 is connected to the end of the oil return pipeline 201, and the exhaust valve 203 can be operated to open to discharge the gas inside the exhaust oil chamber 202 after it is filled with oil. The exhaust oil chamber 202 is made of transparent material and is connected to the end of the oil return pipeline 201. Since air may exist in the pipeline of the oil extraction device during installation, by setting the exhaust oil chamber 202, when liquid flows from the oil drain pipeline 103 through the circulation pipeline 501 to the oil return pipeline 201, the liquid gradually fills the exhaust oil chamber 202. The exhaust valve 203 is located above the exhaust oil chamber 202 (relative to the exhaust oil chamber 202). Figure 1 (Up and down direction in the middle), so as to facilitate observation of whether the liquid fills the exhaust oil chamber 202. When the liquid fills the exhaust oil chamber 202, open the exhaust valve 203 to release the gas in the oil taking device, then close the exhaust valve 203, and then let the liquid enter the switch oil chamber.

[0032] In this embodiment, the oil return assembly 2 further includes a fixing member II 204, which is used to fix the exhaust oil chamber 202 to the oil inlet pipe 4. The fixing member II 204 can be a fixed flange or other structure to facilitate the installation of the oil return assembly 2.

[0033] In this embodiment, the circulation device 5 includes a circulation pump, which is installed on the circulation pipeline 501. The circulation pump is not shown in the figure. The circulation pump can be an application of the mechanical pump in the prior art, and the connection method with the pipeline is an application of the prior art, which will not be described in detail here. The circulation pump is installed to facilitate the circulation of stagnant oil back to the switch oil chamber.

[0034] In this embodiment, the circulation device 5 further includes a control unit, which is used to control the flow rate of the circulation pump. The control unit is a combination of a CPU and peripheral circuits, which is an application of existing technology and will not be described in detail here. The control unit is communicatively connected to the motor of the circulation pump. The control unit controls the flow rate of the circulation pump by controlling the motor speed. At the same time, the control unit is also communicatively connected to the flow meter 503, so as to facilitate monitoring the flow rate in the entire pipeline.

[0035] In this embodiment, the fixing component I102 and the fixing component II204 are fixing flanges; the fixing component I102 and the fixing component II204 are fixing flanges, which facilitates the disassembly and installation of the entire oil extraction device, makes the operation simple, and facilitates repeated use.

[0036] In this embodiment, the circulation pipe 501 is a PVC transparent steel wire hose; the circulation pipe 501 is a 4-point PVC transparent steel wire hose. Of course, the nominal diameter of the pipe can also be other sizes, which can be selected according to the needs of use. It is easy to carry and easy to observe the flow of liquid in the pipe, so as to make it easy to determine whether the liquid in the pipe flows into the exhaust oil chamber 202.

[0037] In this embodiment, an oil drain valve 301 is provided on the oil drain pipe 3, and an oil return valve 401 is provided on the oil inlet pipe 4. With the oil drain valve 301 on the oil drain pipe 3 and the oil return valve 401 on the oil inlet pipe 4, the oil return valve 401 is opened after all the gas in the exhaust oil chamber 202 has been released, which can prevent air from entering the switch oil chamber and facilitate the control of the oil extraction process.

[0038] In this embodiment, the circulation device 5 is equipped with a switch 502, a display screen 504, and a flow meter 503. The output end of the flow meter 503 is connected to the input end of the control unit, and the output end of the control unit is connected to the input end of the display screen 504. By setting the switch 502, the operation of the circulation device 5 can be easily controlled. The connection method is an application of existing technology and will not be described in detail here. By setting the display screen 504, various data of the operation of the circulation device 5 can be displayed, such as the flow rate of the circulation pump. By setting the flow meter 503, the liquid flow rate in the pipeline of the entire oil extraction device can be monitored. The flow meter 503 transmits the acquired flow information to the control unit. The unit and control unit issue operating commands to the circulating pump based on the acquired flow information. In this structure, the liquid flow velocity in the pipeline is ≤1.2m / s, which makes the flow velocity lower than the action threshold of the heavy gas relay. Therefore, it is not necessary to remove the heavy gas pressure plate during sampling, thereby reducing working time and manpower. At the same time, the flow rate is statistically analyzed to ensure that all the residual oil is circulated into the switch oil chamber (the amount of residual oil in the drain pipe 3 can be calculated according to the equipment specifications of the transformer). Of course, the circulation device 5 is powered by a 24V lithium battery, which does not require an external power supply, making the entire oil sampling device more convenient to use, easy to carry and operate in the station.

[0039] The working process of this utility model is as follows: The oil drain assembly 1 and the oil drain pipe 3 are fixedly connected; the oil return assembly 2 and the oil inlet pipe 4 are fixedly connected; the circulation device 5 is connected to the oil drain assembly 1 and the oil return assembly 2 respectively; the oil drain valve 301 and the oil drain valve 101 are opened sequentially; the circulation device 5 is opened, allowing the stagnant oil to flow into the circulation pipeline 501; the control unit controls the flow rate of the circulation pump; it is observed whether the stagnant oil fills the exhaust oil chamber 202; when the exhaust oil chamber 202 is full, the exhaust valve 203 is opened; when the gas is discharged, the exhaust valve 203 is closed; the oil return valve 401 is opened, allowing the stagnant oil to return to the switch oil chamber, and the flow meter 503... The data is used to determine whether all the stagnant oil has returned to the switch oil chamber. After all the oil has returned to the switch oil chamber, the return oil valve 401 is closed and the sampling valve 6 is opened for sampling. After sampling is completed, the oil sampling device is disassembled. The on-load tap changer oil sampling device of this utility model can effectively avoid oil sample contamination and accurately obtain effective oil samples from the on-load tap changer oil chamber. It avoids deviations in test results caused by incorrect oil sampling, eliminates misjudgments of transformer operating status caused by inaccurate test results, and thus avoids the potential risk of transformer power outage. At the same time, it avoids the discharge of excess oil samples and reduces the number of times oil needs to be replenished during power outages.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An oil sampling device for an on-load tap changer of a main transformer, characterized in that: include: The oil drain assembly is detachably and fixedly connected to the oil drain pipe of the switch oil chamber, including the oil drain line; The oil return assembly is detachably and fixedly connected to the oil inlet pipe of the switch oil chamber, including the oil return pipeline; A circulation device for circulating the stagnant oil in the drain pipe to the switch oil chamber, including a circulation pipeline, wherein the circulation pipeline is detachably and fixedly connected to the drain pipe and the return pipe; A sampling valve is installed on the oil drain line and is used to open when stagnant oil circulates to the switch oil chamber to obtain an oil sample from the switch oil chamber.

2. The oil sampling device for the on-load tap changer of the main transformer according to claim 1, characterized in that: The oil drain assembly also includes a fixing component I and an oil drain valve. The fixing component I is used to fix it to the oil drain pipe, and the oil drain valve is located above the oil drain pipe relative to the sampling valve.

3. The oil sampling device for the on-load tap changer of the main transformer according to claim 2, characterized in that: The oil return assembly also includes an exhaust oil chamber and an exhaust valve. The exhaust oil chamber is connected to the end of the oil return pipeline, and the exhaust valve can be operated to open to discharge the gas in the exhaust oil chamber after the oil has filled the exhaust oil chamber.

4. The oil sampling device for the on-load tap changer of the main transformer according to claim 3, characterized in that: The oil return assembly also includes a fixing component II, which is used to fix the exhaust oil chamber to the oil inlet pipe.

5. The oil sampling device for the on-load tap changer of the main transformer according to claim 1, characterized in that: The circulation device includes a circulation pump, which is installed on the circulation pipeline.

6. The oil sampling device for the on-load tap changer of the main transformer according to claim 5, characterized in that: The circulation device also includes a control unit for controlling the flow rate of the circulation pump.

7. The oil sampling device for the on-load tap changer of the main transformer according to claim 4, characterized in that: The fixing component I and fixing component II are fixing flanges.

8. The oil sampling device for the on-load tap changer of the main transformer according to claim 1, characterized in that: The circulation pipeline is a PVC transparent steel wire hose.

9. The oil sampling device for the on-load tap changer of the main transformer according to claim 1, characterized in that: An oil drain valve is installed on the oil drain pipe, and an oil return valve is installed on the oil inlet pipe.

10. The oil sampling device for the on-load tap changer of the main transformer according to claim 1, characterized in that: The circulation device is equipped with a switch, a display screen, and a flow meter.

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