A transformer built-in gas generation defect simulation device, system, and simulation test method.

Abstract

This invention provides a transformer-embedded gas generation defect simulation device, system, and simulation test method, belonging to the field of electrical testing technology. The device includes a transformer and a gas generation defect simulation component. The component includes a sealed container, an oil pump, a flow meter, a through-hole, and an oil inlet pipe. The sealed container stores transformer oil containing fault-specific gases with a specific gas content. The outlet of the sealed container is connected to the inlet of the oil pump, and the outlet of the oil pump is connected to the inlet of the flow meter. The through-hole is located on the side wall of the transformer's oil tank and has a through-hole connecting the inside and outside of the tank. The outlet of the flow meter is connected to one side of the through-hole, and one end of the oil inlet pipe is connected to the other side of the through-hole, with the other end extending into the tank. This invention solves the problems of limited simulation test range and insufficient accuracy caused by the shortcomings of conventional gas generation defect simulation methods in related technologies.

Description

Technical Field

[0001] This invention relates to the field of electrical testing technology, and in particular to a device, system, and simulation test method for simulating gas generation defects built into transformers. Background Technology

[0002] Power transformers are crucial hub equipment in power systems, and their safe and reliable operation is fundamental to ensuring a normal power supply. During operation, transformers generate small amounts of gas dissolved in the insulating oil due to aging, electrical, and thermal faults. The content of various gas components and their proportions are closely related to the transformer's operating condition. However, due to the large size, complex structure, large oil volume, long gas transmission path, and high gas solubility of transformers, the correlation between the monitored characteristic quantities of dissolved gas in the oil and the fault states at different locations is not yet clear, leading to untimely responses to rapidly developing faults. Furthermore, the rate of gas generation in transformers is affected by environmental and equipment operating conditions, the long sampling intervals of online monitoring devices, and fluctuations in monitoring data, making it prone to missed or false alarms.

[0003] In related technologies, to study the gas concentration changes throughout the process of gas diffusion from the fault point to the measurement point, it is necessary to conduct defect simulation experiments by setting up the transformer in a laboratory. The volume of gas generated inside the transformer is determined by the degree of degradation of the insulation material and is closely related to the severity of the fault. Existing defect simulation methods typically involve creating partial discharge defects inside the transformer to generate fault-characteristic gases, and installing sensing devices at the oil taps connected to the transformer's oil circuit to analyze dissolved gases in the oil exiting the tap.

[0004] The simulation test method in the relevant technology requires a certain amount of discharge of the partial discharge defect in order to achieve the specific fault characteristic gas volume and component fraction. When it is necessary to simulate a large area of ​​high temperature overheating or a more serious discharge fault inside the equipment, as the discharge amount of the partial discharge defect increases, uncontrollable sparks may be generated, causing internal damage to the transformer body structure. As a result, the current fault simulation method can only be limited to small-scale fault simulation with a small gas production volume, and the test accuracy is insufficient. Summary of the Invention

[0005] This invention provides a transformer-embedded gas generation defect simulation device, system, and simulation test method, which can solve the problems of limited simulation test range and insufficient accuracy caused by the shortcomings of conventional gas generation defect simulation methods in related technologies. The technical solution is as follows:

[0006] In a first aspect, embodiments of the present invention provide a transformer-embedded gas generation defect simulation device for use in conjunction with a transformer to conduct gas generation defect simulation experiments, comprising: a gas generation defect simulation component.

[0007] The gas generation defect simulation component includes a sealed container, an oil pump, a flow meter, a through-plate, and an oil inlet pipe. The sealed container stores transformer oil containing fault characteristic gases with a specific gas content. The outlet of the sealed container is connected to the inlet of the oil pump, and the outlet of the oil pump is connected to the inlet of the flow meter. The through-plate is installed on the side wall of the transformer tank and has a through-hole for connecting the inside and outside of the tank. The outlet of the flow meter is connected to one side of the through-hole, and one end of the oil inlet pipe is connected to the other side of the through-hole, with the other end extending into the tank.

[0008] Optionally, a connecting tee is provided at the through port, the connecting tee including a first interface for connecting to the inside of the oil tank and a second interface and a third interface for connecting to the outside of the oil tank, one end of the oil inlet pipe is connected to the first interface, the outlet of the flow meter is connected to the second interface, and the third interface is provided with an exhaust valve.

[0009] Optionally, an oil injection valve is provided at the second interface.

[0010] Optionally, the outlet of the flow meter is connected to the second interface via an external hose.

[0011] Optionally, the oil inlet pipe is a flexible hose.

[0012] Optionally, it also includes a control power supply, which is connected to the oil pump.

[0013] Optionally, the through plate is detachably connected to the oil tank.

[0014] Secondly, embodiments of the present invention also provide a transformer built-in gas generation defect simulation system, including the transformer built-in gas generation defect simulation device as described in the first aspect above, characterized in that it further includes the transformer, and the oil tank of the transformer is provided with a plurality of fixing members at intervals for fixing the oil inlet pipe.

[0015] Optionally, the fastener is a cable tie or a fastening buckle.

[0016] Thirdly, embodiments of the present invention also provide a simulation test method, implemented based on the transformer built-in gas generation defect simulation system described in the second aspect above, comprising:

[0017] The transformer oil is equipped with fault characteristic gases containing a specific gas content, and the prepared transformer oil is stored in the sealed container.

[0018] The detachable cover plate on the transformer's oil tank is modified to form the through plate, which is then connected in sequence to the sealed container, the oil pump, the flow meter, the through plate, and the oil inlet pipe.

[0019] Turn on the oil pump and inject the transformer oil into the transformer tank. Adjust the oil injection speed by adjusting the input voltage of the oil pump. Observe the total amount of oil injected and the oil injection speed through the flow meter, and record the opening status of the oil pump, gas content, oil injection point, oil temperature, and ambient temperature.

[0020] Online chromatographic monitoring of the transformer oil flowing out from the oil tank is carried out, or offline oil samples are taken at different times and chromatographic analysis is performed on the oil samples. The relationship between the changes in dissolved gas content in the oil at different gas-generating parts of the transformer and at different oil sampling ports and state data such as diffusion distance, temperature, and oil flow velocity is analyzed.

[0021] Optionally, the simulation test method further includes: during the process of injecting the transformer oil into the oil tank, using low-frequency heating to raise the coil temperature of the transformer.

[0022] Optionally, the simulation test method further includes: turning on the transformer's own cooler during the process of filling the oil tank with transformer oil.

[0023] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0024] The transformer-embedded gas generation defect simulation device provided in this invention modifies the cover plate of the transformer tank to form a through-plate connecting the inside and outside of the tank. A sealed container, an oil pump, and a flow meter are sequentially connected to form an oil injection pipeline, which, together with the transformer, forms an internal transformer-embedded gas generation defect simulation system. An oil inlet pipe is connected inside the through-plate, extending its end to the location within the transformer where the gas generation defect simulation is needed. By controlling the gas generation defect simulation components, transformer oil containing fault characteristic gases with a specific gas content from the sealed container is introduced into the tank to simulate gas generation defects in a specific area inside the transformer. Subsequently, chromatographic analysis is performed on the oil exiting from different oil outlets on the tank to observe changes in the gas components and their volume fractions, providing a platform for the evaluation and assessment of dissolved gas monitoring devices in transformer oil. This method of simulating gas generation faults will not damage the internal structure of the transformer. Furthermore, the simulation location can be easily changed and set, and it can be used repeatedly. This effectively solves the problems of limited simulation test range and insufficient accuracy caused by conventional gas generation defect simulation methods in related technologies. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0026] Figure 1 This is a schematic diagram of the gas generation defect simulation device provided in an embodiment of the present invention;

[0027] Figure 2 This is a front view structural diagram of the transformer provided in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the left-side structure of the transformer provided in an embodiment of the present invention;

[0029] Figure 4 This is a partial structural assembly diagram of the transformer built-in gas generation defect simulation system provided in an embodiment of the present invention;

[0030] Figure 5 This is a flowchart of a simulation test method provided in an embodiment of the present invention.

[0031] In the picture:

[0032] 1-Transformer; 2-Gas generation defect simulation component; 11-Oil tank; 11a-Cover plate; 21-Sealed container; 22-Oil pump; 23-Flow meter; 24-Through plate; 25-Oil inlet pipe; 26-Connecting tee; 27-Control power supply; 111-Fixed component; 231-External hose; 241-Through port; 261-First interface; 262-Second interface; 263-Third interface; 264-Exhaust valve; 265-Oil injection valve; 2411-Metal pipe. Detailed Implementation

[0033] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0034] Example 1:

[0035] Figure 1 This is a schematic diagram of the gas generation defect simulation device provided in an embodiment of the present invention; Figure 2 This is a front view structural diagram of the transformer provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the left-side structure of the transformer provided in an embodiment of the present invention; Figure 4 This is a partial structural assembly diagram of the transformer built-in gas generation defect simulation system provided in an embodiment of the present invention. Figures 1 to 4As shown, this embodiment of the invention provides a transformer built-in gas generation defect simulation device for use in conjunction with transformer 1 to conduct gas generation defect simulation tests. The device includes a gas generation defect simulation component 2.

[0036] The gas generation defect simulation component 2 includes a sealed container 21, an oil supply pump 22, a flow meter 23, a through-hole 24, and an oil inlet pipe 25. The sealed container 21 stores transformer oil containing fault-specific gases with a specific gas content. The outlet of the sealed container 21 is connected to the inlet of the oil supply pump 22, and the outlet of the oil supply pump 22 is connected to the inlet of the flow meter 23. The through-hole 24 is located on the side wall of the oil tank 11 of the transformer 1, and has a through-hole 241 connecting the inside and outside of the oil tank 11. The outlet of the flow meter 23 is connected to one side of the through-hole 241, and one end of the oil inlet pipe 25 is connected to the other side of the through-hole 241, with the other end extending into the oil tank 11.

[0037] In this embodiment of the invention, transformer 1 is the transformer to be subjected to the gas generation defect simulation test, and the through-plate 24 in the gas generation defect simulation component 2 is detachably connected to the oil tank 11 of transformer 1, such as... Figure 3 As shown, the through-plate 24 can be modified from the opening cover 11a of the oil tank 11, which is used to connect with external oil filling pipes, etc. A through-plate 24 with a through-hole 241 can be formed by drilling holes in the cover 11a or by directly using a replacement cover with a through hole in the middle. Depending on the location of the through-plate 24, different oil inlet pipes 25 can be connected to different through-holes 241 to extend their ends to different positions inside the oil tank 11, simulating gas generation defects occurring at those locations. A metal tube 2411 is inserted into the opening of the through-hole 241 and welded firmly to the through-plate 24 to ensure the sealing of both sides of the through-hole 241. Threads are pre-drilled at both ends of the metal tube 2411 to form a threaded structure on both sides of the through-hole 241 for connection with the flow meter 23 and the oil inlet pipe 25. Furthermore, each through-hole 241 and the port of the metal pipe 2411 can be marked with a corresponding number to distinguish its installation location, facilitating docking and installation by staff. By installing the gas generation defect simulation component 2 in conjunction with the transformer 1 to be tested, a complete transformer built-in gas generation defect simulation system is formed.

[0038] Furthermore, the through-port 241 is located outside the transformer 1, that is, the port of the metal pipe 2411 located outside the oil tank 11 is connected to a connecting tee 26, including a first interface 261 connecting to the inside of the oil tank 11 and a second interface 262 and a third interface 263 connecting to the outside of the oil tank 11. One end of the oil inlet pipe 25 is connected to the first interface 261, the outlet of the flow meter 23 is connected to the second interface 262, and the third interface 263 is provided with an exhaust valve 264. Exemplarily, in this embodiment of the invention, by setting a connecting tee 26 at the front end of the through-port 241, the oil inlet pipe 25 in the form of a flexible hose is connected to one side of the first interface 261 through the metal pipe 2411 inside the oil tank 11 to connect the oil circuit. The end can be bent and extended to a designated position inside the oil tank 11 according to actual needs to realize the fault simulation of the required position, including but not limited to: the upper part of the clamp, the lower part of the clamp, inside the riser, the lead equalizing pipe, inside the coil, inside the enclosure, etc. Inside the oil tank, multiple fasteners 111, such as cable ties, clips, crepe paper, or support frames, can be installed at intervals to further secure the oil inlet pipe 25 along its extension path. This prevents the hose-type oil inlet pipe 25 from loosening and causing deviation in the oil outlet position due to oil flow disturbance during the test. Outside the oil tank 11, the sealing container 21, the oil pump 22, and the flow meter 23 are connected to the inside of the oil tank 11 via a first interface 261 and a second interface 262. An oil injection valve 265 is installed at the second interface 262, which can be closed at any time to stop oil injection via external control, reducing the consumption of the simulation test and ensuring timely response to stop commands. Furthermore, an exhaust valve 264 is installed at the third interface 263 to expel residual impurities and gas from the pipe at the front end of the through-port 241 before oil injection, preventing them from mixing into the transformer oil used in the simulation test and affecting subsequent detection of gas components in the oil outlet, thus improving the accuracy of the simulation test.

[0039] Furthermore, the outlet of the flow meter 23 is connected to the second interface 262 via an external hose 231. Exemplarily, in this embodiment of the invention, this external hose 231 connects the outlet of the flow meter 23 to the connecting tee 26, simplifying the connection and facilitating the installation of oil pipelines. Furthermore, the type of hose is selected based on actual conditions. In this embodiment, a transparent PU hose with an inner diameter of 6mm and an outer diameter of 8mm is selected, which is oil-resistant and pressure-resistant, operating at pressures of 0.5–1.5MPa, and can operate normally between -40℃ and 90℃, meeting the requirements for use inside transformers. The connection between the external hose 231 and the connecting tee 26 can be achieved using a quick-connect fitting, offering advantages such as convenient installation, reliable sealing, and secure connection.

[0040] Optionally, a control power supply 27 is also included, which is connected to the oil pump 22. Exemplarily, in this embodiment of the invention, by setting the control power supply 27, the power of the oil pump 22 can be adjusted to regulate the oil injection speed and meet different simulation experimental conditions.

[0041] The transformer-embedded gas generation defect simulation device provided in this embodiment of the invention modifies the cover plate on the oil tank 11 of transformer 1 to form a through-plate 24 connecting the inside and outside of the oil tank. A sealed container 21, an oil pump 22, and a flow meter 23 are sequentially connected and connected to the outside of the through-port 241 of the through-plate 24 to form an oil injection pipeline, which, together with the transformer 1, constitutes a transformer-embedded gas generation defect simulation system. An oil inlet pipe 25 is connected inside the through-port 241, with its end extended to the location inside the transformer 1 where gas generation defect simulation is required. By controlling the gas generation defect simulation component 2, transformer oil containing fault characteristic gases with a specific gas content from the sealed container 21 is introduced into the oil tank 11 to simulate gas generation defects in a specific area inside the transformer 1. Subsequently, chromatographic analysis is performed on the oil exiting from different oil outlets on the oil tank 11 to observe changes in the gas components and their volume fractions, providing a platform for the evaluation and assessment of dissolved gas monitoring devices in transformer oil. This method of simulating gas generation faults will not damage the internal structure of transformer 1. Furthermore, the simulation location can be easily changed and set, and it can be used repeatedly. This effectively solves the problems of limited simulation test range and insufficient accuracy caused by the shortcomings of conventional gas generation defect simulation methods in related technologies.

[0042] Example 2:

[0043] Figure 5 This is a flowchart of a simulation test method provided in an embodiment of the present invention. Figure 5 As shown, embodiments of the present invention also provide a simulation test method, based on, as Figures 1 to 4 The detection device and system shown are implemented by including the following steps:

[0044] S1. Prepare transformer oil, which contains fault characteristic gases with a specific gas content, and store the prepared transformer oil in a sealed container 21.

[0045] Specifically, in the steps, transformer oil containing fault characteristic gases with a specific gas content is prepared and pre-stored in advance. During subsequent tests, this transformer oil is directly introduced into a designated location inside transformer 1 to simulate gas generation faults in the corresponding area. This eliminates the need to additionally set up and create partial discharge defects inside transformer 1, avoiding damage to the internal structure of transformer 1 and effectively improving the safety and freedom of the test.

[0046] S2. Modify the detachable cover plate on the oil tank 11 of transformer 1 to form a through plate 24, and connect the sealing container 21, oil pump 22, flow meter 23, through plate 24 and oil inlet pipe 25 in sequence.

[0047] Specifically, in the steps, according to as follows Figure 1 and Figure 4 The connection structure shown enables the combined installation of transformer 1 and gas generation defect simulation component 2.

[0048] S3. Turn on the oil pump 22 to inject transformer oil into the oil tank 11 of transformer 1. Adjust the oil injection speed by adjusting the input voltage of the oil pump 22. Observe the total amount of oil injected and the oil injection speed through the flow meter 23, and record the opening status of the oil pump 22, gas content, oil injection point, oil temperature and ambient temperature.

[0049] Specifically, in the steps, in order to simulate the oil flow state under the operation of the transformer, the cooler of the transformer 1 itself can be turned on; and in order to simulate the oil flow state under the heat inside the transformer, low-frequency heating can be used to raise the internal temperature of the transformer 1, so as to improve the accuracy of the overall simulation test.

[0050] S4. Conduct online chromatographic monitoring of the transformer oil flowing out from the oil outlet on the oil tank 11, or take offline oil samples at different times and perform chromatographic analysis on the oil samples to analyze the relationship between the dissolved gas content change parameters in the oil at different gas-generating parts and different oil outlets of the transformer 1 with state data such as diffusion distance, temperature, and oil flow velocity.

[0051] Specifically, in this step, oil samples are taken from different oil inlets of transformer 1 to determine the initial gas content in the oil. During the oil injection process, the oil injection speed can be adjusted by adjusting the control power supply 27 of the oil pump 22. The total amount of oil injected and the injection speed can be viewed through the flow meter 23. The operating status of the transformer 1's supercooler, the oil injection location, the oil temperature, and the ambient temperature are recorded accordingly. After stopping the oil injection, the experiment is considered complete when the chromatographic data from each oil inlet are essentially the same and no longer change significantly. The relationship between important characteristic parameters of the dissolved gas content changes in the oil at different sampling points of transformer 1 with diffusion distance, temperature, oil flow velocity, and other conditions can be analyzed.

[0052] The transformer-embedded gas generation defect simulation device and the above-described simulation test method provided in this embodiment of the invention modify the cover plate on the oil tank 11 of transformer 1 to form a through-plate 24 connecting the inside and outside of the oil tank. A sealing container 21, an oil pump 22, and a flow meter 23 are sequentially connected and connected to the outside of the through-port 241 of the through-plate 24 to form an oil injection pipeline. An oil inlet pipe 25 is connected inside the through-port 241, and the end of the pipe is extended to the location inside transformer 1 where the gas generation defect simulation needs to be performed. By controlling the gas generation defect simulation component 2, transformer oil containing fault characteristic gases with a specific gas content from the sealing container 21 is introduced into the oil tank 11 to simulate a gas generation defect in a specific area inside transformer 1. Then, chromatographic analysis is performed on the oil exiting from different oil outlets on the oil tank 11 to observe the changes in gas components and their volume fractions, providing a platform for the evaluation and assessment of dissolved gas monitoring devices in transformer oil. This method of simulating gas generation faults will not damage the internal structure of transformer 1. Furthermore, the simulation location can be easily changed and set, and it can be used repeatedly. This effectively solves the problems of limited simulation test range and insufficient accuracy caused by the shortcomings of conventional gas generation defect simulation methods in related technologies.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present invention, they can still make various changes, modifications or equivalent substitutions to the specific implementation of the invention, but these changes, modifications or equivalent substitutions are all within the scope of protection of the pending claims of the invention.

Claims

1. A transformer-embedded gas generation defect simulation device, used in conjunction with a transformer (1) to conduct gas generation defect simulation experiments, characterized in that, include: Gas generation defect simulation component (2). The gas generation defect simulation component (2) includes a sealed container (21), an oil pump (22), a flow meter (23), a through-plate (24), and an oil inlet pipe (25). The sealed container (21) stores transformer oil, which has fault characteristic gases with a specific gas content. The outlet of the sealed container (21) is connected to the inlet of the oil pump (22), and the outlet of the oil pump (22) is connected to the inlet of the flow meter (23). The through-plate (24) is used for... On the side wall of the oil tank (11) of the transformer (1), there is a through port (241) for connecting the inside and outside of the oil tank (11). The outlet of the flow meter (23) is connected to one side of the through port (241). The oil pipe (25) is a flexible hose. One end of the oil pipe (25) is connected to the other side of the through port (241), and the other end is used to bend and extend to a designated position inside the oil tank (11) to realize the fault simulation of the required position.

2. The transformer built-in gas generation defect simulation device according to claim 1, characterized in that, A connecting tee (26) is provided at the through port (241). The connecting tee (26) includes a first interface (261) for connecting to the inside of the oil tank (11), and a second interface (262) and a third interface (263) for connecting to the outside of the oil tank (11). One end of the oil inlet pipe (25) is connected to the first interface (261), the outlet of the flow meter (23) is connected to the second interface (262), and the third interface (263) is provided with an exhaust valve (264).

3. The transformer built-in gas generation defect simulation device according to claim 2, characterized in that, An oil injection valve (265) is provided at the second interface (262).

4. The transformer built-in gas generation defect simulation device according to claim 2, characterized in that, The outlet of the flow meter (23) is connected to the second interface (262) via an external hose (231).

5. The transformer built-in gas generation defect simulation device according to claim 1, characterized in that, It also includes a control power supply (27), which is connected to the oil pump (22).

6. The transformer built-in gas generation defect simulation device according to claim 1, characterized in that, The through plate (24) is detachably connected to the oil tank (11).

7. A transformer built-in gas generation defect simulation system, characterized in that, The transformer includes the built-in gas generation defect simulation device as described in any one of claims 1 to 6, and also includes the transformer (1), wherein the oil tank (11) of the transformer (1) is provided with a plurality of fixing members (111) at intervals for fixing the oil inlet pipe (25).

8. The transformer built-in gas generation defect simulation system according to claim 7, characterized in that, The fastener (111) is a cable tie or a fastening buckle.

9. A simulation test method, based on the transformer built-in gas generation defect simulation system as described in claim 7, characterized in that, include: The transformer oil is equipped with fault characteristic gas with a specific gas content, and the prepared transformer oil is stored in the sealed container (21). The detachable cover plate on the oil tank (11) of the transformer (1) is modified to form the through plate (24), and the sealed container (21), the oil pump (22), the flow meter (23), the through plate (24) and the oil inlet pipe (25) are connected in sequence. Turn on the oil pump (22) and inject the transformer oil into the oil tank (11) of the transformer (1). Adjust the oil injection speed by adjusting the input voltage of the oil pump (22). Observe the total amount of oil injected and the oil injection speed through the flow meter (23). Record the opening status, gas content, oil injection location, oil temperature and ambient temperature of the oil pump (22). Online chromatographic monitoring of the transformer oil flowing out from the oil tank (11) is carried out, or offline oil samples are taken at different times and chromatographic analysis is performed on the oil samples to analyze the relationship between the changes in dissolved gas content in the oil at different gas-generating parts of the transformer (1) and different oil sampling ports and state data such as diffusion distance, temperature, and oil flow rate.

10. The simulation test method according to claim 9, characterized in that, The simulation test method further includes: during the process of injecting the transformer oil into the oil tank (11), the coil temperature of the transformer (1) is increased by using low-frequency heating.

11. The simulation test method according to claim 9, characterized in that, The simulation test method further includes: during the process of injecting the transformer oil into the oil tank (11), turning on the transformer (1)'s own cooler.

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