Transformer built-in gas production defect simulation device, system and simulation test method

Abstract

The invention provides a built-in gas production defect simulation device and system for a transformer and a simulation test method, and belongs to the technical field of electrician detection. The device comprises a transformer and a gas production defect simulation assembly, the gas production defect simulation assembly comprises a sealed container, an oil feeding pump, a flow meter, a through disc and an oil guide pipeline, transformer oil is stored in the sealed container and contains fault characteristic gas with specific gas content, and an outlet of the sealed container is connected with an inlet of the oil feeding pump; an outlet of the oil feeding pump is connected with an inlet of the flowmeter, the penetrating disc is arranged on the side wall of an oil tank of the transformer and provided with a penetrating opening communicating the inside and the outside of the oil tank, an outlet of the flowmeter is connected with one side of the penetrating opening, one end of the oil guiding pipeline is connected with the other side of the penetrating opening, and the other end of the oil guiding pipeline extends into the oil tank. The problems of large simulation test range limitation and insufficient accuracy caused by the insufficiency of a conventional gas production defect simulation mode in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the field of electrical testing technology, and in particular to a transformer built-in gas generation defect simulation device, system and simulation test method. Background Art

[0002] Power transformers are important hub equipment in power systems, and their safe and reliable operation is an important basis for ensuring normal power supply. During the operation of transformers, a small amount of gas will be dissolved in the insulating oil due to aging, electrical and thermal failures, etc. The content of various components of the gas in the oil and the proportional relationship between different components are closely related to the operating conditions of the transformer. Due to the characteristics of transformers such as large size, complex structure, large amount of oil, long gas transmission path, and strong gas solubility, the corresponding relationship between the characteristic quantity of the dissolved gas monitored in the oil and the fault state at different locations is not clear, and the response to rapidly developing faults is not timely. Moreover, the gas production speed of the transformer is affected by the environment and equipment operating conditions, the long sampling interval of the online monitoring device, and the fluctuation of the monitoring data, which is prone to omissions or false alarms.

[0003] In related technologies, the change law of gas concentration in the whole process of gas diffusion from the fault point to the measurement point needs to be studied by setting up the transformer in the laboratory for defect simulation test. The volume of gas generated inside the transformer is determined by the degree of degradation of the insulating material and is closely related to the degree of fault. Existing defect simulation methods usually use local discharge defects inside the transformer to generate fault characteristic gas, and set a sensing device at the oil intake port connected to the oil circuit in the transformer to analyze the dissolved gas in the oil at the oil intake port.

[0004] In order to achieve a specific fault characteristic gas volume and component fraction, the simulation test method in the relevant technology has certain requirements on the discharge amount of the local discharge defect. 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 local discharge defect increases, uncontrollable sparks may be generated, causing internal damage to the transformer body structure. As a result, the current fault simulation method is limited to small-scale fault simulation with small gas production, and the test accuracy is insufficient. Summary of the invention

[0005] The embodiment of the present invention provides a transformer built-in gas generation defect simulation device, system and simulation test method, which can solve the problems of large limitation of 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, an embodiment of the present invention provides a transformer built-in gas generation defect simulation device, which is used to cooperate with the transformer to perform a gas generation defect simulation experiment, including: a gas generation defect simulation component,

[0007] The gas production defect simulation component includes a sealed container, an oil pump, a flow meter, a through disk and an oil guide pipe. The sealed container stores transformer oil, and the transformer oil has a fault characteristic gas 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 disk is used to be arranged on the side wall of the oil tank of the transformer, and is provided with a through port for connecting the inside and outside of the oil tank. The outlet of the flow meter is connected to one side of the through port, and one end of the oil guide pipe is connected to the other side of the through port, and the other end is used to extend to the inside of the oil tank.

[0008] Optionally, a connecting tee is provided at the through-port, and the connecting tee includes 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 supply pipeline 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 filling 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 guide pipeline is a hose.

[0012] Optionally, a control power supply is also included, and the control power supply is connected to the oil pump.

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

[0014] In a second aspect, an embodiment of the present invention further provides a transformer built-in gas generation defect simulation system, comprising a transformer built-in gas generation defect simulation device as described in the first aspect above, characterized in that it also includes the transformer, wherein the oil tank of the transformer is internally provided with a plurality of fixing parts at intervals for fixing and connecting the oil guide pipe.

[0015] Optionally, the fixing piece is a cable tie or a fixing buckle.

[0016] In a third aspect, an embodiment of the present invention further provides a simulation test method, which is implemented based on the transformer built-in gas generation defect simulation system described in the second aspect, and includes:

[0017] Prepare the transformer oil, the transformer oil has a specific gas content of fault characteristic gas, and store the prepared transformer oil in the sealed container;

[0018] The cover plate detachably connected to the oil tank of the transformer is modified to form the through plate, and the sealed container, the oil feed pump, the flow meter, the through plate and the oil guide pipe are sequentially connected;

[0019] Turn on the oil feed pump, inject the transformer oil into the oil tank of the transformer, adjust the oil injection speed by adjusting the input voltage of the oil feed pump, observe the total amount of oil injection and the oil injection speed through the flow meter, and record the opening state of the oil feed pump, gas content, oil injection location, oil temperature, and ambient temperature;

[0020] Online chromatographic monitoring is carried out on the transformer oil flowing out through the oil extraction port on the oil tank, or offline oil samples are taken at different times and chromatographic analysis is performed on the oil samples to analyze the relationship between the change parameters of the dissolved gas content in the oil at different gas-producing parts of the transformer of this structure and different oil extraction ports and the state data such as diffusion distance, temperature, and oil flow velocity.

[0021] Optionally, the simulation test method further comprises: in the process of injecting the transformer oil into the oil tank, using a low-frequency heating method to increase the coil temperature of the transformer.

[0022] Optionally, the simulation test method further comprises: during the process of injecting the transformer oil into the oil tank, turning on the cooler of the transformer itself.

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

[0024] The transformer built-in gas generation defect simulation device provided by the embodiment of the present invention is used. The cover plate on the oil tank of the transformer is modified to form a through disk connecting the inside and outside of the oil tank. The sealed container, the oil pump, the flow meter are connected in sequence and connected to the outside of the through-hole of the through-hole disk to form an oil filling pipeline, and together with the transformer, a transformer built-in gas generation defect simulation system is formed. An oil inlet pipeline is connected to the inside of the through-hole and the end of the pipeline is extended to the position in the transformer where gas generation defect simulation is required. By controlling the gas generation defect simulation component, the transformer oil with fault characteristic gas with a specific gas content in the sealed container is introduced into the oil tank to simulate the occurrence of gas generation defects in a specific area inside the transformer. Afterwards, the oil output from different oil extraction ports on the oil tank is subjected to chromatographic analysis, and the changes in the gas components and gas volume fractions in the output oil are observed, providing a platform for the assessment and evaluation of the dissolved gas monitoring device in the transformer oil. The use of this gas production fault simulation form will not cause damage to the internal structure of the transformer, and the simulation position is easy to change and set, and can be used repeatedly, effectively solving the problems of large limitations on the simulation test range and insufficient accuracy caused by the deficiencies of conventional gas production defect simulation methods in related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

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

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

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

[0030] Figure 5 It is a flow chart of a simulation test method provided by an embodiment of the present invention.

[0031] In the figure:

[0032] 1-transformer; 2-gas production defect simulation component; 11-oil tank; 11a-cover plate; 21-sealed container; 22-oil pump; 23-flow meter; 24-through plate; 25-oil pipeline; 26-connecting tee; 27-control power supply; 111-fixing part; 231-external hose; 241-through port; 261-first interface; 262-second interface; 263-third interface; 264-exhaust valve; 265-oil filling valve; 2411-metal pipe. DETAILED DESCRIPTION

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

[0034] Embodiment 1:

[0035] Figure 1 is a schematic structural diagram of a gas generation defect simulation device provided by an embodiment of the present invention; Figure 2 is a front view structural schematic diagram of a transformer provided in an embodiment of the present invention; Figure 3 is a left-side structural schematic diagram of a transformer provided in an embodiment of the present invention; Figure 4 1 is a partial structural assembly diagram of a transformer built-in gas generation defect simulation system provided by an embodiment of the present invention. Figures 1 to 4As shown, an embodiment of the present invention provides a transformer built-in gas generation defect simulation device, which is used to cooperate with a transformer 1 to perform a gas generation defect simulation test. The device includes a gas generation defect simulation component 2.

[0036] Among them, the gas production defect simulation component 2 includes a sealed container 21, an oil pump 22, a flow meter 23, a through disk 24 and an oil inlet pipeline 25. Transformer oil is stored in the sealed container 21, and the transformer oil has a fault characteristic gas 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 disk 24 is arranged on the side wall of the oil tank 11 of the transformer 1, and a through hole 241 connecting the inside and outside of the oil tank 11 is arranged on it, the outlet of the flow meter 23 is connected to one side of the through hole 241, one end of the oil inlet pipeline 25 is connected to the other side of the through hole 241, and the other end extends to the inside of the oil tank 11.

[0037] In the embodiment of the present invention, the transformer 1 is a transformer to be subjected to a 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 the transformer 1. Figure 3 As shown, the through disk 24 can be modified by using the open cover plate 11a equipped on the oil tank 11 for connecting with the external oil filling pipeline, etc., by drilling holes on the cover plate 11a, or directly using a replacement cover plate with a through hole in the middle to form a through disk 24 structure with a through hole 241. According to the setting position of the through disk 24, different oil guide pipes 25 can be connected at different through holes 241 to extend their ends to different positions in the oil tank 11 to simulate the gas production defects occurring in this part. A metal tube 2411 is inserted into the opening of the through hole 241, and the metal tube 2411 is firmly welded to the through disk 24 to ensure the sealing of both sides of the through hole 241. Threads are reserved at both ends of the metal tube 2411 to form a threaded structure on both sides of the through hole 241 to connect with the end of the flow meter 23 and the oil guide pipe 25. Furthermore, each through hole 241 and the port of the metal tube 2411 can be marked with a corresponding number to distinguish their installation positions, so as to facilitate the staff to carry out docking and installation. By installing the gas generation defect simulation component 2 in conjunction with the transformer 1 to be tested, a complete set of transformer built-in gas generation defect simulation system is formed.

[0038] Further, the through-port 241 is provided with a connection tee 26 outside the transformer 1, that is, the port of the metal tube 2411 located outside the oil tank 11, including a first interface 261 connected to the inside of the oil tank 11 and a second interface 262 and a third interface 263 connected to the outside of the oil tank 11, one end of the oil inlet pipeline 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 the embodiment of the present invention, by providing a connection tee 26 at the front end of the through-port 241, the oil inlet pipeline 25 in the form of a hose is connected to one side of the first interface 261 through the metal tube 2411 inside the oil tank 11 to connect the oil circuit, and the end can be bent and extended to a specified position in the oil tank 11 according to actual needs to achieve fault simulation of the required position, including but not limited to: the upper part of the clamp, the lower part of the clamp, the inside of the riser, the lead equalizing tube, the inside of the coil, the inside of the enclosure, etc. Among them, multiple fixings 111 can be arranged at intervals inside the oil tank, such as cable ties, fixing buckles, corrugated paper or support frames, etc., to further fix the oil guide pipe 25 on the extension path, so as to prevent the oil guide pipe 25 in the form of a hose from loosening due to oil flow disturbance during the test, resulting in oil outlet position deviation; and outside the oil tank 11, it realizes the connection between the pipeline on one side of the sealed container 21, the oil pump 22, and the flow meter 23 and the inside of the oil tank 11 through the first interface 261 and the second interface 262, and an oil filling valve 265 is arranged at the second interface 262, which can be closed at any time to stop the oil filling through external control, thereby reducing the consumption of the simulation test and responding to the stop command in time. By arranging an exhaust valve 264 on the third interface 263, the residual impurity gas in the front end pipeline of the through-port 241 can be discharged before oil filling, so as to avoid mixing into the transformer oil used for the simulation test and affecting the subsequent detection of the gas components in the oil outlet, thereby improving the accuracy of the simulation test.

[0039] Furthermore, the outlet of the flowmeter 23 is connected to the second interface 262 through an external hose 231. Exemplarily, in an embodiment of the present invention, this external hose 231 connects the outlet end of the flowmeter 23 with the connecting tee 26, the connection is simple, and the hose form is convenient for the layout of the oil pipeline. Further, the type of hose is selected according to the actual situation. In an embodiment of the present invention, a PU transparent polyurethane hose with an inner diameter of 6mm and an outer diameter of 8mm is selected. It has the characteristics of oil resistance and pressure resistance, and the operating pressure is 0.5 to 1.5MPa. It can work normally between -40℃ and 90℃, which can meet the internal use of the transformer. The connection method between the external hose 231 and the connecting tee 26 can adopt a quick-tighten joint, which has the advantages of easy installation, reliable sealing, and firm connection.

[0040] Optionally, a control power supply 27 is further included, and the control power supply 27 is connected to the oil pump 22. For example, in the embodiment of the present invention, by setting the control power supply 27, the power of the oil pump 22 can be adjusted to adjust the speed of oil injection to meet different simulation experimental conditions.

[0041] The transformer built-in gas generation defect simulation device provided by the embodiment of the present invention is used. The cover plate on the oil tank 11 of the transformer 1 is modified to form a through disk 24 connecting the inside and outside of the oil tank. The sealed container 21, the oil pump 22, the flow meter 23 are connected in sequence to the outside of the through hole 241 of the through disk 24 to form an oil filling pipeline, and together with the transformer 1, a transformer built-in gas generation defect simulation system is formed. The oil inlet pipeline 25 is connected to the inside of the through hole 241 and the end of the pipeline is extended to the position in the transformer 1 where gas generation defect simulation is required. By controlling the gas generation defect simulation component 2, the transformer oil with fault characteristic gas with a specific gas content in the sealed container 21 is introduced into the oil tank 11 to simulate the situation of gas generation defects in a specific area inside the transformer 1. After that, the oil output from different oil extraction ports on the oil tank 11 is subjected to chromatographic analysis, and the changes in the gas components and gas volume fractions in the output oil are observed, providing a platform for the assessment and evaluation of the dissolved gas monitoring device in the transformer oil. The use of this gas production fault simulation form will not cause damage to the internal structure of the transformer 1, and the simulation position is easy to change and set, and can be used repeatedly, which effectively solves the problems of large limitations on the simulation test range and insufficient accuracy caused by the deficiencies of conventional gas production defect simulation methods in related technologies.

[0042] Embodiment 2:

[0043] Figure 5 1 is a flow chart of a simulation test method provided by an embodiment of the present invention. Figure 5 As shown, the embodiment of the present invention also provides a simulation test method based on Figures 1 to 4 The detection device and system shown are implemented, comprising the following steps:

[0044] S1. Prepare transformer oil, the transformer oil has a specific gas content of fault characteristic gas, and store the prepared transformer oil in a sealed container 21.

[0045] Specifically, in the step, transformer oil with fault characteristic gas having a specific gas content is prepared and pre-stored in advance, and the transformer oil is directly introduced into a designated position inside the transformer 1 during subsequent tests to simulate gas-generating faults in the corresponding area. There is no need to additionally set up and manufacture local discharge defects inside the transformer 1, thereby avoiding damage to the internal structure of the transformer 1 and effectively improving the safety and freedom of the test.

[0046] S2. The detachably connected cover plate on the oil tank 11 of the transformer 1 is modified to form a through plate 24, and the sealed container 21, the oil pump 22, the flow meter 23, the through plate 24 and the oil guide pipe 25 are connected in sequence.

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

[0048] S3, start the oil pump 22, inject transformer oil into the oil tank 11 of the transformer 1, adjust the input voltage of the oil pump 22 to adjust the oil injection speed, observe the total amount of oil injection and the oil injection speed through the flow meter 23, and record the opening state of the oil pump 22, gas content, oil injection position, oil temperature, and ambient temperature.

[0049] Specifically, in the step, in order to simulate the oil flow state under the operation state 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 heating inside the transformer, low-frequency heating can be used to increase the internal temperature of the transformer 1 to improve the accuracy of the overall simulation test.

[0050] S4, carry out online chromatographic monitoring of the transformer oil flowing out through the oil extraction port on the oil tank 11, or take offline oil samples at different times and perform chromatographic analysis on the oil samples, and analyze the relationship between the change parameters of the dissolved gas content in the oil at different gas-producing parts of the transformer 1 of this structure and different oil extraction ports and the state data such as diffusion distance, temperature, and oil flow velocity.

[0051] Specifically, in this step, oil samples are taken from different oil extraction ports of the transformer 1 to determine the initial gas content in the oil. During the oil injection process, the speed of oil injection can be adjusted by adjusting the control power supply 27 of the oil pump 22. The accumulated total amount of oil injection and the oil injection speed can be viewed through the flow meter 23. The cooler opening state, oil injection position, oil temperature, ambient temperature and other conditions on the transformer 1 are recorded accordingly. After the oil injection is stopped, the chromatographic data of each oil extraction port are basically the same and no longer change significantly, and the test is considered to be over. The relationship between the important characteristic parameters of the change of the dissolved gas content in the oil at different sampling points of the transformer 1 of this structure and the diffusion distance, temperature, oil flow velocity and other states can be analyzed.

[0052] The transformer built-in gas generation defect simulation device and the above-mentioned simulation test method provided in the embodiment of the present invention are used. The cover plate on the oil tank 11 of the transformer 1 is modified to form a through disk 24 connecting the inside and outside of the oil tank, and the sealing container 21, the oil pump 22, the flow meter 23 are connected in sequence and connected to the outside of the through hole 241 of the through disk 24 to form an oil injection pipeline. The oil inlet pipeline 25 is connected to the inside of the through hole 241 and the end of the pipeline is extended to the position where the gas generation defect simulation is required in the transformer 1. By controlling the gas generation defect simulation component 2, the transformer oil with a specific gas content of the fault characteristic gas in the sealed container 21 is introduced into the oil tank 11 to simulate the gas generation defect in a specific area inside the transformer 1. After that, the oil output from different oil extraction ports on the oil tank 11 is chromatographically analyzed, and the changes in the gas components and gas volume fractions in the output oil are observed, providing a platform for the assessment and evaluation of the dissolved gas monitoring device in the transformer oil. The use of this gas production fault simulation form will not cause damage to the internal structure of the transformer 1, and the simulation position is easy to change and set, and can be used repeatedly, which effectively solves the problems of large limitations on the simulation test range and insufficient accuracy caused by the deficiencies of conventional gas production 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 rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the invention.

Claims

1. A transformer built-in gas generation defect simulation device, used for carrying out a gas generation defect simulation experiment in conjunction with a transformer (1), characterized in that: include: Gas generation defect simulation component (2), The gas generation defect simulation component (2) comprises a sealed container (21), an oil pump (22), a flow meter (23), a through disk (24) and an oil guide pipe (25). The sealed container (21) stores transformer oil, and the transformer oil has a fault characteristic gas 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 disk (24) is used to be arranged on the side wall of the oil tank (11) of the transformer (1), and is provided with a through hole (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 hole (241). One end of the oil guide pipe (25) is connected to the other side of the through hole (241), and the other end is used to extend to the inside of the oil tank (11).

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 opening (241), the connecting tee (26) comprising 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 guide 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: The second interface (262) is provided with an oil filling valve (265).

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 2, characterized in that: The oil guide pipeline (25) is a hose.

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

7. 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).

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

9. The transformer built-in gas generation defect simulation system according to claim 8, characterized in that: The fixing member (111) is a cable tie or a fixing buckle.

10. A simulation test method, implemented based on the transformer built-in gas generation defect simulation device according to claim 8, characterized in that: include: Prepare the transformer oil, the transformer oil has a specific gas content of fault characteristic gas, and store the prepared transformer oil in the sealed container (21); The cover plate detachably connected to the oil tank (11) of the transformer (1) is modified to form the through plate (24), and the sealed container (21), the oil feed pump (22), the flow meter (23), the through plate (24) and the oil guide pipe (25) are sequentially connected; The oil feed pump (22) is turned on to inject the transformer oil into the oil tank (11) of the transformer (1), the oil injection speed is adjusted by adjusting the input voltage of the oil feed pump (22), the total amount of oil injection and the oil injection speed are observed through the flow meter (23), and the opening state of the oil feed pump (22), the gas content, the oil injection position, the oil temperature, and the ambient temperature are recorded; Online chromatographic monitoring is performed on the transformer oil flowing out through the oil extraction port on the oil tank (11), or offline oil samples are taken at different times and chromatographic analysis is performed on the oil samples to analyze the relationship between the variation parameters of the dissolved gas content in the oil at different gas-producing locations of the transformer (1) of this structure and at different oil extraction ports and the state data such as diffusion distance, temperature, and oil flow velocity.

11. The simulation test method according to claim 10, characterized in that: The simulation test method further comprises: in the process of injecting the transformer oil into the oil tank (11), using a low-frequency heating method to increase the coil temperature of the transformer (1).

12. The simulation test method according to claim 10, characterized in that: The simulation test method further comprises: during the process of injecting the transformer oil into the oil tank (11), turning on the cooler of the transformer (1) itself.

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