On-line monitoring device with oil mixing function for gas in transformer oil and control method of on-line monitoring device

Abstract

The invention discloses an on-line monitoring device with an oil mixing function for gas in transformer oil and a control method thereof.The device comprises a degassing module, a gas detection module and a master control module, in the degassing module, an oil inlet of an oil storage tank is communicated with a plurality of oil taking ports sequentially formed in a transformer body from top to bottom through an oil inlet valve, and the oil taking ports are communicated with the gas detection module; a gas outlet of the oil storage tank is connected with a sucking pump, a heating unit and a stirring unit are arranged in the oil storage tank, the gas outlet of the oil storage tank communicates with the gas inlet end of the gas detection module through a gas outlet valve, and the main control module is connected with the data output end of the gas detection module. The main control module is further connected with the control ends of the oil inlet valve, the sucking pump heating unit, the stirring unit and the gas outlet valve so as to create a negative pressure environment in the oil storage tank, and oil gas in the oil storage tank is rapidly balanced and then detected by the gas detection module. Oil is taken from a plurality of sampling ports of the transformer, so that internal faults of the transformer can be found earlier.

Description

Technical Field

[0001] The invention relates to a transformer state monitoring technology, and in particular to an online transformer oil gas monitoring device with an oil mixing function and a control method thereof. Background Art

[0002] As one of the important equipment in the power system, the "health status" of the transformer directly affects the safe and stable operation of the power grid. Therefore, it is very meaningful and necessary to analyze the transformer failure. An in-depth analysis of transformer failure cases in recent years shows that when the transformer fails, the content of H2, C2H2, total hydrocarbons and other gases dissolved in the oil will increase and continue to increase. This may be caused by loose shielding caps or bolts, core vibration, insulation damage, etc. It is very meaningful to monitor the content of each component gas dissolved in the transformer oil in real time. It can reflect most of the possible early faults of the transformer and reflect the development trend and severity of the fault.

[0003] At present, the most important means of transformer status monitoring is the online monitoring device for dissolved gases in transformer oil, which monitors the content of H2, CO, CO2, CH4, C2H4, C2H6, C2H2 and other gases dissolved in transformer oil. Each transformer is equipped with one device. However, each online monitoring device can only take oil from the fixed oil intake port of the transformer, which represents the operation status of the local position of the transformer, but cannot represent the operation status of the entire transformer.

[0004] According to experimental data from a certain document, when a discharge fault occurs at the far end of the oil outlet of a ±800kV transformer, if the submersible oil pump is not started, it takes about 7 days for the discharge fault to spread to the oil outlet. If the submersible oil pump is started, it takes about 6 hours for the discharge fault gas to spread to the oil outlet.

[0005] It can be seen that single-point online monitoring devices often have problems such as data false alarms and device failures, and cannot play a real-time monitoring role, which greatly reduces the practicality of the monitoring method and interferes with the user's judgment. Summary of the invention

[0006] The technical problem to be solved by the present invention is as follows: In view of the above-mentioned problems in the prior art, an online monitoring device for gas in transformer oil with an oil mixing function and a control method thereof are provided. By taking oil from multiple sampling ports of the transformer, oil samples containing fault gas can be collected in time, thereby discovering internal faults of the transformer as early as possible.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] The utility model discloses an online monitoring device for gas in transformer oil with oil mixing function, comprising a degassing module, a gas detection module and a main control module. The oil inlet of the oil storage tank of the degassing module is respectively connected with a plurality of oil extraction ports arranged in sequence from top to bottom of the corresponding transformer body through an oil inlet valve. The main control module is connected with the control end of the oil inlet valve. The air outlet of the oil storage tank is connected with an air pump, and the main control module is connected with the control end of the air pump, so that the air pump is controlled to create a negative pressure environment inside the oil storage tank. A heating unit and a stirring unit are provided in the oil storage tank. The air outlet of the oil storage tank is connected with the air inlet end of the gas detection module through the air outlet valve. The data acquisition end of the main control module is connected with the data output end of the gas detection module. The main control module is also respectively connected with the control ends of the heating unit, the stirring unit and the air outlet valve, so that the heating unit and the stirring unit are controlled to make the oil and gas in the oil storage tank reach equilibrium quickly, and then the air outlet valve is controlled to open so that the gas in the oil storage tank is detected by the gas detection module.

[0009] Furthermore, a corresponding oil extraction port valve is provided between each oil extraction port and the oil inlet valve, and a first sensor corresponding to each oil extraction port is provided in the oil storage tank from top to bottom. The main control module is connected to the first sensor to obtain corresponding liquid level information, and the main control module is connected to the control end of the oil extraction port valve to control the corresponding oil inlet amount.

[0010] Furthermore, the oil storage tank is also provided with a second sensor for detecting the internal pressure of the oil storage tank.

[0011] Furthermore, the oil outlet of the oil storage tank is connected to the oil return valve of the transformer body through an oil drain valve and an oil drain pump in sequence, and the control ends of the oil drain valve and the oil drain pump are connected to the main control module, so that the oil drain valve is controlled to open and the oil drain pump is controlled to operate to recover the residual oil in the oil storage tank.

[0012] Furthermore, the oil drain valve is a three-way valve, a first inlet of the three-way valve is connected to an inlet of an oil inlet valve, a second inlet of the three-way valve is connected to an oil outlet of an oil storage tank, and an outlet of the three-way valve is connected to an oil drain pump.

[0013] Furthermore, the gas detection module is a TDLAS detection device, the heating unit is an electric heating plate, and the stirring unit is a bubbling pump.

[0014] Furthermore, the oil storage tank is provided with an oil storage bin corresponding to each oil extraction port, the oil inlet of each oil storage bin is connected to the corresponding oil extraction port through an oil inlet valve, the air outlet of each oil storage bin is connected to an air pump, and each oil storage bin is provided with a heating unit and a stirring unit. The air outlet valve is a channel switching valve, the air outlet of the channel switching valve is connected to the air inlet end of the gas detection module, and each air inlet of the channel switching valve is connected to the air outlet of different oil storage bins.

[0015] The present invention further provides a control method for the transformer oil gas online monitoring device with oil mixing function as described in any one of the above, comprising the following steps:

[0016] S1) the main control module controls the air pump and the air outlet valve to open until the pressure value fed back by the second sensor meets the requirement, and then controls the air pump and the air outlet valve to close;

[0017] S2) the main control module controls the oil inlet valve to open, and then opens the oil outlet valves corresponding to each oil outlet in order from bottom to top, specifically, opens the current oil outlet valve, and waits for the corresponding first sensor to feedback a full oil signal, then closes the current oil outlet valve and opens the next oil outlet valve;

[0018] S3) the main control module waits for the first sensor corresponding to each oil inlet to feedback a full oil signal, controls the heating unit and the stirring unit to operate, and turns off the heating unit and the stirring unit after waiting for a first time, and leaves them for a second time;

[0019] S4) The main control module controls the outlet valve to open, waits for and obtains the gas detection value of the gas detection module, and displays the gas detection value in real time. If the gas detection value does not meet the requirements, it is determined that the corresponding transformer is faulty.

[0020] Furthermore, before step S1, the following steps are also included:

[0021] The main control module controls the oil inlet valve to be closed and controls the first inlet and outlet of the oil discharge valve to be connected, opens the oil inlet valve corresponding to each oil inlet in turn and controls the oil discharge pump to operate, specifically, opens the current oil inlet valve and controls the oil discharge pump to operate, waits for a third time, closes the current oil inlet valve and controls the oil discharge pump to stop, and then opens the next oil inlet valve and controls the oil discharge pump to operate;

[0022] After all the oil inlet valves have been traversed, all the oil inlet valves are closed and the oil discharge pump is stopped, and then the second inlet and outlet of the oil discharge valve are controlled to be connected.

[0023] Furthermore, before step S1, the following steps are also included:

[0024] The main control module controls the oil inlet valve and any oil outlet valve to open, and after waiting for a first time, controls the oil inlet valve and the oil outlet valve to close, and then controls the oil drain pump to open until the first sensor at the bottom of the oil storage tank feeds back an oil-free signal, and stops the oil drain pump.

[0025] Compared with the prior art, the advantages of the present invention are:

[0026] The oil inlet of the oil storage tank in the degassing module of the present invention is connected with a plurality of oil extraction ports arranged in sequence from top to bottom of the transformer body, so that the oil sample containing the fault gas can be collected in time. The vacuum pump in the degassing module can create a negative pressure environment in the oil storage tank, accelerate the precipitation of gas molecules from the transformer oil, and at the same time, a heating unit and a stirring unit are provided in the oil storage tank, which can greatly enhance the activity of the oil and gas molecules, accelerate the release of the gas molecules dissolved in the oil, and allow the oil and gas in the tank to quickly reach equilibrium. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 FIG. 4 is a block diagram of the device structure of an embodiment of the present invention.

[0028] Figure 2 Schematic diagram of the specific structure of the degassing module according to an embodiment of the present invention.

[0029] Figure 3 Schematic diagram of the control relationship of the functional modules of an embodiment of the present invention.

[0030] Figure 4 Schematic diagram of the working principle of the gas detection module according to an embodiment of the present invention.

[0031] Figure 5 The figure is a flow chart of a control method according to an embodiment of the present invention.

[0032] Legend: 1-degassing module, 2-gas detection module, 3-main control module, 11-oil storage tank, 12-vacuum pump, 13-heating unit, 14-stirring unit, 101-oil inlet valve, 102-oil intake port, 103-gas outlet valve, 104-oil intake port valve, 105-first sensor, 106-second sensor, 107-oil drain valve, 108-oil drain pump. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0034] Before introducing the specific embodiments of the present invention, related concepts are first explained.

[0035] TDLAS: Tunable semiconductor laser absorption spectroscopy technology uses the ultra-narrow linewidth and tuning characteristics of the laser to scan a single absorption line of the gas, so it has a very high spectral resolution and can effectively eliminate the cross-interference of other gas spectral lines, ensuring the accuracy of multi-component gas feature identification. TDLAS can be divided into direct absorption spectroscopy technology and wavelength modulation absorption spectroscopy technology (wavelength modulation spectroscopy, WMS). Compared with direct absorption spectroscopy technology, WMS technology improves detection accuracy and sensitivity by setting a higher modulation frequency, effectively improving the stability of the system.

[0036] Embodiment 1

[0037] This embodiment provides an online monitoring device for transformer oil gas with oil mixing function, such as Figure 1 As shown, it includes a degassing module 1, a gas detection module 2 and a main control module 3, without consumables and wearing parts.

[0038] The degassing module 1 of this embodiment adopts dynamic headspace degassing technology and is composed of components such as an oil storage tank with oil mixing function, an oil pump, an air pump, and a sensor. Figure 2 and Figure 3 As shown, in the degassing module 1, the oil inlet of the oil storage tank 11 is connected to a plurality of oil extraction ports 102 arranged in sequence from top to bottom of the corresponding transformer body through an oil inlet valve 101, the main control module 3 is connected to the control end of the oil inlet valve 101, the air outlet of the oil storage tank 11 is connected to the air pump 12, and the main control module 3 is connected to the control end of the air pump 12, so that the air pump 12 is controlled to create a negative pressure environment inside the oil storage tank 11. A heating unit 13 and a stirring unit 14 are provided in the oil storage tank 11. In this embodiment, the heating unit 13 is an electric heating plate, and the stirring unit 14 is a bubbling pump. The gas outlet of the oil storage tank 11 is connected to the gas inlet end of the gas detection module 2 through the gas outlet valve 103, the data acquisition end of the main control module 3 is connected to the data output end of the gas detection module 2, and the main control module 3 is also connected to the heating unit 13, the stirring unit 14, and the control end of the gas outlet valve 103, so that the heating unit 13 and the stirring unit 14 are controlled to make the oil and gas in the oil storage tank 11 quickly reach equilibrium, and then the gas outlet valve 103 is controlled to open so that the gas in the oil storage tank 11 is detected by the gas detection module 2. It should be noted that the stirring unit 14 of this embodiment adopts a bubbling pump, which can pass the carrier gas into the oil in the oil storage tank 11 for stirring, and the carrier gas can blow the gas released in the oil into the gas detection module 2 for detection.

[0039] In this embodiment, the three oil extraction ports 102 are sequentially arranged on the transformer body from top to bottom, namely, an upper oil extraction port, a middle oil extraction port and a lower oil extraction port. By simultaneously extracting oil from the upper, middle and lower three oil extraction ports, oil samples containing faulty gas can be collected in time, thereby discovering internal faults of the transformer early.

[0040] like Figure 2 As shown, in this embodiment, a corresponding oil inlet valve 104 is provided between each oil inlet 102 and the oil inlet valve 101, and a first sensor 105 corresponding to each oil inlet 102 is provided in the oil storage tank 11 from top to bottom. Figure 3 As shown, the main control module 3 is connected to the first sensor 105 to obtain the corresponding liquid level information, and the main control module 3 is connected to the control end of the oil inlet valve 104 to control the corresponding oil intake. In this embodiment, the first sensors 105 are arranged at equal intervals in the height direction, so that each oil intake port 102 can be sampled equally. The first sensor 105 can be a liquid level sensor and / or a pressure sensor, and the oil intake can be double-judged by the liquid level sensor and the pressure sensor.

[0041] Figure 2 There are three liquid level sensors in the middle oil storage tank 11 from top to bottom, namely, the upper liquid level sensor, the middle liquid level sensor and the lower liquid level sensor. When the transformer oil does not reach the liquid level sensor, it feeds back an oil-free signal (such as a low level) to the main control module 3. When the transformer oil reaches the liquid level sensor, it feeds back a full oil signal (such as a high level) to the main control module 3. Therefore, the oil intake can be divided into three equal parts, one part is taken from the lower oil intake port of the transformer, one part is taken from the middle oil intake port of the transformer, and one part is taken from the upper oil intake port of the transformer. Specifically, when the main control module 3 receives the full oil signal of the lower liquid level sensor / middle liquid level sensor, it controls the corresponding oil intake valve 104 to close, and controls the oil intake valve 104 corresponding to the middle liquid level sensor / upper liquid level sensor located adjacent and above it to open. When the full oil signal of all liquid level sensors is received, all oil intake valves 104 are controlled to close. At this time, the oil storage tank 11 already has equal amounts of mixed oil from the three oil intake ports of the transformer. The mixed oil is subsequently heated, stirred, and allowed to stand to allow the oil and gas in the oil storage tank 11 to quickly reach equilibrium, and then the gas detection module 2 detects and determines whether the transformer is faulty based on the detection results.

[0042] like Figure 2 As shown, the oil storage tank 11 of this embodiment is also provided with a second sensor 106 for detecting the internal pressure of the oil storage tank 11. The second sensor 106 is arranged on the top of the oil storage tank 11 and adopts a pressure sensor, such as Figure 3 As shown, the main control module 3 is connected to the second sensor 106 so as to understand the internal pressure condition of the oil storage tank 11 through real-time feedback of pressure value data.

[0043] like Figure 2 As shown, the oil outlet of the oil storage tank 11 of this embodiment is connected to the oil return valve of the transformer body through the oil discharge valve 107 and the oil discharge pump 108 in sequence. Figure 3 As shown, the control ends of the oil drain valve 107 and the oil drain pump 108 are both connected to the main control module 3 , so that the oil drain valve 107 is controlled to open and the oil drain pump 108 is controlled to operate to recover the residual oil in the oil storage tank 11 .

[0044] In this embodiment, the oil drain valve 107 is a three-way valve, the first inlet of the three-way valve is connected to the inlet of the oil inlet valve 101, the second inlet of the three-way valve is connected to the oil outlet of the oil storage tank 11, and the outlet of the three-way valve is connected to the oil drain pump 108. Through the above structure, when the first inlet and outlet of the three-way valve are connected, self-circulation of the transformer inlet and return port can be achieved, dead oil in the pipeline is avoided, and there is no need to pass through the oil reservoir 11 inside the degassing module 1.

[0045] In this embodiment, the gas detection module 2 is a TDLAS detection device. The gas detection module 2 uses the TDLAS detection device to detect both the single-component acetylene content and the multi-component gas content. In view of the fact that the separate spectral elements used in the wavelength division multiplexing technology of multi-component gas detection reduce the compactness and stability of the system, the use of diffraction elements may also introduce standard tool noise, and there is cross-interference between the detection channels of the frequency division modulation multiplexing technology, and the number of multi-channel lasers is limited. Time-division multiplexing technology not only has a simple optical structure and only requires one set of signal conversion and processing systems, but also has no technical restrictions on the number of lasers. Therefore, this embodiment uses time-division multiplexing technology based on time-sharing scanning to achieve real-time detection of multi-component gases. Correspondingly, the gas detection module 2 is composed of components such as a DFB laser, a laser driving unit, a signal processing unit, and a gas absorption cell. The workflow is as follows: Figure 4 As shown, the measuring gas chamber obtains the gas from the degassing module 1, and the TDLAS detection equipment adopts the time division multiplexing technology based on time division scanning to realize the real-time detection of multi-component gas, which is well known to those skilled in the art and is not the focus of this solution, and will not be repeated here.

[0046] The main control module 3 of this embodiment mainly plays the role of data reception, data processing and analysis, data communication, etc., and has a 7-inch LCD screen to support local display functions, such as Figure 4 As shown, after the main control module 3 collects the data output by the gas detection module 2 and performs data processing such as filtering and interpolation, the relevant data is stored and displayed in the display interface of the liquid crystal display in the form of charts, etc., and the corresponding data content is displayed at the same time.

[0047] Embodiment 2

[0048] The present embodiment proposes an online monitoring device for gas in transformer oil with an oil mixing function, which is basically the same as the first embodiment, except that an oil storage bin corresponding to each oil extraction port 102 is provided in the oil storage tank 11, and the oil inlet of each oil storage bin is connected to the corresponding oil extraction port 102 through an oil inlet valve 101, and the air outlet of each oil storage bin is connected to the air pump 12. A heating unit 13 and a stirring unit 14 are provided in each oil storage bin, and the air outlet valve 103 is a channel switching valve, and the air outlet of the channel switching valve is connected to the air inlet end of the gas detection module 2, and each air inlet of the channel switching valve is connected to the air outlet of different oil storage bins.

[0049] In this embodiment, each oil storage bin is arranged in sequence from top to bottom and separated from each other by partitions. A first sensor 105 for checking the liquid level and a second sensor 106 for checking the internal pressure are respectively provided on the top of each oil storage bin. The oil outlet of each oil storage bin is connected to the oil return valve of the transformer body through an oil drain valve 107 and an oil drain pump 108 in sequence.

[0050] Through the above structure, the degassing module 1 can simultaneously separate the transformer oil and gas in different parts of the transformer, and control the gas detection sequence of different parts of the transformer by switching different channels by controlling the outlet valve 103. By comprehensively analyzing the gas detection results of different parts of the transformer, it is possible to not only determine whether the transformer is faulty, but also obtain the approximate fault location when determining the transformer fault.

[0051] For example, if one of the gas detection results corresponding to the upper oil outlet, the middle oil outlet, and the lower oil outlet is abnormal, the transformer is faulty, and the location of the oil outlet corresponding to the abnormal result is the approximate fault location of the transformer.

[0052] Embodiment 3

[0053] This embodiment proposes a control method for an online monitoring device for gas in transformer oil with an oil mixing function according to the first embodiment and the second embodiment. Figure 5 As shown, the following steps are included:

[0054] S101) Transformer inlet and return ports are self-circulated to avoid dead oil in the pipeline:

[0055] The main control module 3 controls the oil inlet valve 101 to close and controls the first inlet and outlet of the oil drain valve 107 to be connected, opens the oil inlet valve 104 corresponding to each oil inlet 102 in turn and controls the oil drain pump 108 to operate, specifically opens the current oil inlet valve 104 and controls the oil drain pump 108 to operate, waits for a specified time, closes the current oil inlet valve 104 and controls the oil drain pump 108 to stop, then opens the next oil inlet valve 104 and controls the oil drain pump 108 to operate. In this embodiment, since the transformer body is sequentially provided with the upper oil inlet, the middle oil inlet and the lower oil inlet from top to bottom, the upper, middle and lower oil inlets have a separate circulation time of 1 minute, and at least 1.5L of oil can be circulated. (In order to increase the on-site test, the time can be set to 30 seconds or the function can be shielded for the factory experiment), and the process takes 3 minutes;

[0056] After all the oil inlet valves 104 have been traversed, all the oil inlet valves 104 are closed and the oil discharge pump 108 is stopped, and then the second inlet and outlet of the oil discharge valve 107 are controlled to be connected;

[0057] S102) Clean the oil reservoir to avoid residual oil in the oil reservoir:

[0058] The main control module 3 controls the oil inlet valve 101 and any oil outlet valve 104 to open, and after waiting for a specified time (it is necessary to ensure that all first sensors 105 feedback a full oil signal), controls the oil inlet valve 101 and the oil outlet valve 104 to close, and then controls the oil discharge pump 108 to open, until the first sensor 105 at the bottom of the oil storage tank 11 feedbacks an oil-free signal, and stops the oil discharge pump 108;

[0059] This step can improve the accuracy of the first monitoring result. The process is expected to take 5 minutes.

[0060] S1) Vacuum the oil reservoir:

[0061] The main control module 3 controls the air pump 12 and the air outlet valve 103 to open until the pressure value fed back by the second sensor 106 meets the requirement, and then controls the air pump 12 and the air outlet valve 103 to close;

[0062] S2) Oil inlet to the oil reservoir:

[0063] The main control module 3 controls the oil inlet valve 101 to open, and then opens the oil inlet valve 104 corresponding to each oil inlet 102 in order from bottom to top, specifically, opens the current oil inlet valve 104, and waits for the corresponding first sensor 105 to feedback a full oil signal, then closes the current oil inlet valve 104 and opens the next oil inlet valve 104;

[0064] S3) The oil tank is heated, stirred and then left to stand:

[0065] After the main control module 3 waits for the first sensors 105 corresponding to each oil inlet 102 to feedback a full oil signal, it controls the heating unit 13 and the stirring unit 14 to operate, waits for a period of time to ensure that the gas molecules dissolved in the oil are fully released, and then turns off the heating unit 13 and the stirring unit 14 and leaves it to stand for another period of time;

[0066] When the initial oil temperature of the oil reservoir 11 in the degassing module 1 is 30° C., the process of steps S1 to S3 is expected to reach equilibrium in 25 minutes;

[0067] S4) Gas detection:

[0068] The main control module 3 controls the outlet valve 103 to open, waits for and obtains the gas detection value of the gas detection module 2, and displays the gas detection value in real time. If the size of the gas detection value does not meet the requirement, it is determined that the corresponding transformer is faulty.

[0069] For the situation in Example 2, the main control module 3 controls the gas detection sequence by controlling the outlet valve 103 to switch different channels. The multi-component gas detection time is less than 6 minutes, and then the gas path is cleaned for 30 seconds. In this embodiment, all multi-component gases at the upper oil inlet, middle oil inlet and lower oil inlet of the transformer body are detected and the gas path is cleaned, and the estimated time is 18 minutes.

[0070] It can be seen that through the above steps, the on-site application of the transformer oil gas online monitoring device with oil mixing function in Example 1 and Example 2 can complete the detection cycle of online monitoring of dissolved gas in transformer oil within 30 minutes, which greatly improves the fault detection efficiency and fault detection accuracy of the transformer.

[0071] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An online monitoring device for gas in transformer oil with oil mixing function, characterized in that: The invention comprises a degassing module (1), a gas detection module (2) and a main control module (3); the oil inlet of the oil storage tank (11) of the degassing module (1) is respectively connected to a plurality of oil extraction ports (102) arranged in sequence from top to bottom of the corresponding transformer body through an oil inlet valve (101); the main control module (3) is connected to the control end of the oil inlet valve (101); the gas outlet of the oil storage tank (11) is connected to an air pump (12); and the main control module (3) is connected to the control end of the air pump (12), so that the air pump (12) is controlled to operate to create a negative pressure environment inside the oil storage tank (11); and the oil storage tank (11) is provided with a heating unit (102). 3) and the stirring unit (14), the gas outlet of the oil storage tank (11) is connected to the gas inlet end of the gas detection module (2) through the gas outlet valve (103), the data acquisition end of the main control module (3) is connected to the data output end of the gas detection module (2), and the main control module (3) is also connected to the heating unit (13), the stirring unit (14), and the control end of the gas outlet valve (103), so that the heating unit (13) and the stirring unit (14) are controlled to move so that the oil and gas in the oil storage tank (11) quickly reach equilibrium, and then the gas outlet valve (103) is controlled to open so that the gas in the oil storage tank (11) is detected by the gas detection module (2).

2. The transformer oil gas online monitoring device with oil mixing function according to claim 1 is characterized in that: A corresponding oil extraction port valve (104) is provided between each oil extraction port (102) and the oil inlet valve (101), and first sensors (105) corresponding to each oil extraction port (102) are provided in the oil storage tank (11) from top to bottom, the main control module (3) and the first sensor (105) are connected to obtain corresponding liquid level information, and the main control module (3) and the control end of the oil extraction port valve (104) are connected to control the corresponding oil inlet amount.

3. The transformer oil gas online monitoring device with oil mixing function according to claim 1 is characterized in that: The oil storage tank (11) is also provided with a second sensor (106) for detecting the internal pressure of the oil storage tank (11).

4. The transformer oil gas online monitoring device with oil mixing function according to claim 1 is characterized in that: The oil outlet of the oil storage tank (11) is connected to the oil return valve of the transformer body through an oil drain valve (107) and an oil drain pump (108) in sequence, and the control ends of the oil drain valve (107) and the oil drain pump (108) are connected to the main control module (3), so that the oil drain valve (107) is controlled to open and the oil drain pump (108) is controlled to operate to recover the residual oil in the oil storage tank (11).

5. The transformer oil gas online monitoring device with oil mixing function according to claim 4 is characterized in that: The oil discharge valve (107) is a three-way valve, a first inlet of the three-way valve is connected to the inlet of the oil inlet valve (101), a second inlet of the three-way valve is connected to the oil outlet of the oil storage tank (11), and an outlet of the three-way valve is connected to the oil discharge pump (108).

6. The transformer oil gas online monitoring device with oil mixing function according to claim 1 is characterized in that: The gas detection module (2) is a TDLAS detection device, the heating unit (13) is an electric heating plate, and the stirring unit (14) is a bubbling pump.

7. The transformer oil gas online monitoring device with oil mixing function according to claim 1 is characterized in that: The oil storage tank (11) is provided with an oil storage bin corresponding to each oil extraction port (102) one by one, the oil inlet of each oil storage bin is connected to the corresponding oil extraction port (102) via an oil inlet valve (101), the air outlet of each oil storage bin is connected to an air pump (12), each oil storage bin is provided with a heating unit (13) and a stirring unit (14), the air outlet valve (103) is a channel switching valve, the air outlet of the channel switching valve is connected to the air inlet end of the gas detection module (2), and each air inlet of the channel switching valve is connected to the air outlet of a different oil storage bin.

8. The control method of the on-line monitoring device for gas in transformer oil with oil mixing function according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1) the main control module (3) controls the air pump (12) and the air outlet valve (103) to open until the pressure value fed back by the second sensor (106) meets the requirement, and controls the air pump (12) and the air outlet valve (103) to close; S2) the main control module (3) controls the oil inlet valve (101) to open, and then opens the oil outlet valve (104) corresponding to each oil outlet (102) in sequence from bottom to top, specifically, opens the current oil outlet valve (104), and after waiting for the corresponding first sensor (105) to feedback a full oil signal, closes the current oil outlet valve (104) and opens the next oil outlet valve (104); S3) the main control module (3) waits for the first sensor (105) corresponding to each oil extraction port (102) to feedback a full oil signal, controls the heating unit (13) and the stirring unit (14) to operate, and turns off the heating unit (13) and the stirring unit (14) after waiting for a first time, and leaves the heating unit (13) and the stirring unit (14) to stand for a second time; S4) The main control module (3) controls the gas outlet valve (103) to open, waits for and obtains the gas detection value of the gas detection module (2), and displays the gas detection value in real time. If the gas detection value does not meet the requirements, it is determined that the corresponding transformer is faulty.

9. The control method of the on-line monitoring device for gas in transformer oil with oil mixing function according to claim 8, characterized in that: Before step S1, the following steps are also included: The main control module (3) controls the oil inlet valve (101) to close and controls the first inlet and outlet of the oil discharge valve (107) to be connected, opens the oil inlet valve (104) corresponding to each oil inlet (102) in turn and controls the oil discharge pump (108) to operate, specifically opens the current oil inlet valve (104) and controls the oil discharge pump (108) to operate, waits for a third time, closes the current oil inlet valve (104) and controls the oil discharge pump (108) to stop, and then opens the next oil inlet valve (104) and controls the oil discharge pump (108) to operate; After all the oil inlet valves (104) have been traversed, all the oil inlet valves (104) are closed and the oil discharge pump (108) is stopped, and then the second inlet and outlet of the oil discharge valve (107) are controlled to be connected.

10. The control method of the on-line monitoring device for gas in transformer oil with oil mixing function according to claim 9, characterized in that: Before step S1, the following steps are also included: The main control module (3) controls the oil inlet valve (101) and any oil outlet valve (104) to open, and after waiting for a first time, controls the oil inlet valve (101) and the oil outlet valve (104) to close, and then controls the oil discharge pump (108) to open until the first sensor (105) at the bottom of the oil storage tank (11) feeds back an oil-free signal, and stops the oil discharge pump (108) from operating.

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