Modularized multi-redundancy online monitoring device and monitoring method for gas dissolved in oil

Abstract

The invention discloses a modularized multi-redundancy online monitoring device and monitoring method for dissolved gas in oil, and relates to the technical field of power transformation equipment monitoring, the modularized multi-redundancy online monitoring device comprises a first gas sensing unit and a second gas sensing unit which are connected in series, and the first gas sensing unit and the second gas sensing unit are both used for monitoring the dissolved gas in the oil; information of the first gas concentration and information of the second gas concentration can be output respectively; the data processing module is in signal connection with the first gas sensing unit and the second gas sensing unit and is provided with an error threshold value; the data processing module receives and calculates a concentration difference value between the first gas concentration and the second gas concentration; and when the concentration difference value is greater than the error threshold value, the data processing module outputs a sensing unit maintenance signal. By arranging the photoacoustic detection board card, different types of gases are detected, the detection accuracy and reliability are improved, replacement is convenient, and the detection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of substation equipment monitoring, and in particular to a modular multi-redundant online monitoring device and method for monitoring dissolved gas in oil. Background Art

[0002] The explosion of substation equipment is one of the most influential power accidents. Rapid warning and blocking of explosion failures have always been the persistent demand of the power industry. Modular multi-redundant online monitoring of dissolved gas in oil is an important means to perceive insulation degradation and breakdown of substation equipment. However, the online monitoring device of oil frequently reports false alarms and missed alarms in the harsh climate of "Shago Desert" in Northwest China. The project site faces the following problems: ① The traditional online monitoring device uses a mixed detection mode (one detector detects multiple components), which cannot take into account the range and sensitivity. The minimum detection limit of trace C2H2 cannot reach 0.1μL / L; ② The device uses high-consumption components such as chromatographic columns, choppers, and filter discs. After frequent use, they age significantly, false alarms and missed alarms occur frequently, and the monitoring device has poor stability. ③ The monitoring and detection operations use sequential operations. The chromatographic device takes 1.5 hours for a single detection, and the spectral device takes 1.0 hours for a single detection. It is impossible to quickly review the defect alarm, and the monitoring device has poor rapidity. In summary, the accuracy, stability, and rapidity of dissolved gas monitoring in oil are seriously insufficient.

[0003] The existing modular multi-redundant online monitoring device for dissolved gas in oil has no more than two monitoring hosts. The monitoring host generally uses one gas detection core to detect multiple gases. The gas detection results are abnormal due to damage to the detection core. It is impossible to determine whether the abnormality is in the equipment or in the detection core. Therefore, there are problems of low redundancy of the monitoring host and low redundancy of the detection core. There have also been many cases where operators mistakenly stopped large oil-filled equipment due to abnormal detection cores and abnormal detection results of multiple gas components. In addition, during on-site maintenance, the detection core does not have a hot-swappable function, resulting in the monitoring device problem being handled only during transformer power outages, causing transformer monitoring to be "offline" for a long time.

[0004] Therefore, there is an urgent need for a device that can quickly and accurately monitor dissolved gases in oil to achieve the perception and early warning of insulation defects in large oil-immersed equipment. Summary of the invention

[0005] The technical problem to be solved by the present invention is to solve the deficiencies in the prior art, design a modular multi-redundant online monitoring device and monitoring method for dissolved gas in oil, accurately, stably and reliably detect hydrocarbon gases, and perceive and warn of insulation defects in large oil-immersed equipment.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] In a first aspect, the present invention provides a modular multi-redundant online monitoring device for dissolved gas in oil, comprising:

[0008] A first gas sensing unit and a second gas sensing unit are arranged in series, wherein the first gas sensing unit and the second gas sensing unit are both used to monitor dissolved gas in oil and can output information of a first gas concentration and a second gas concentration respectively;

[0009] A data processing module whose signal is connected to the first gas sensing unit and the second gas sensing unit is provided with an error threshold; the data processing module receives and calculates the concentration difference between the first gas concentration and the second gas concentration; when the concentration difference is greater than the error threshold, the data processing module outputs a sensing unit maintenance signal.

[0010] As a preferred embodiment of the present invention, the first gas sensing unit includes at least two first specific gas sensing cards arranged in series, each of the first specific gas sensing cards is signal-connected to the data processing module, and is configured to detect concentration information of only one specific gas type;

[0011] The second gas sensing unit includes at least two second specific gas sensing cards arranged in series, each of which is signal-connected to the data processing module and is constructed to detect concentration information of only one specific gas type.

[0012] As a preferred embodiment of the present invention, two adjacent first specific gas sensing cards are connected by hot plugging; and two adjacent second specific gas sensing cards are connected by hot plugging.

[0013] As a preferred embodiment of the present invention, all of the first specific gas sensing cards are photoacoustic detection cards; and all of the second specific gas sensing cards are semiconductor detection cards.

[0014] As a preferred embodiment of the present invention, the first gas sensing unit comprises:

[0015] A PCB integrated circuit board, wherein the PCB integrated circuit board is provided with a board air inlet and a board air outlet;

[0016] The PCB integrated circuit board is provided with a sensing unit power supply interface and a sensing unit signal interface;

[0017] The PCB integrated circuit board is provided with a sensing board power supply circuit, a sensing board temperature control circuit and a sensing board signal processing circuit;

[0018] The sensing unit power supply interface is connected to the sensing board power supply circuit; the output end of the sensing board power supply circuit is connected to the sensing board signal processing circuit; the output end of the sensing board temperature control circuit and the sensing unit signal interface is connected to the sensing board signal processing circuit.

[0019] As a preferred embodiment of the present invention, the first specific gas sensing card comprises:

[0020] A photoacoustic gas detection array air inlet, a photoacoustic gas detection array air outlet, and a plurality of photoacoustic detection boards, wherein the photoacoustic detection boards include: a narrow line width laser light source, a photoacoustic cell, and a pickup; the photoacoustic cell is provided with an air inlet chamber and an air outlet chamber on both sides; the air inlet chamber is connected to the air outlet chamber through a photoacoustic cell pipeline; a narrow line width laser light source is arranged on the side of the air inlet chamber; an air inlet is arranged on the upper side of the air inlet chamber; an air outlet is arranged at the upper end of the air outlet chamber; and a pickup is arranged on the side of the air outlet chamber; adjacent photoacoustic detection boards are connected in series through an air path pipeline.

[0021] As a preferred embodiment of the present invention, the first specific gas sensing card includes: a photoacoustic methane gas detection board, a photoacoustic ethane gas detection board, a photoacoustic acetylene gas detection board, a photoacoustic ethylene gas detection board, a photoacoustic carbon monoxide gas detection board, a photoacoustic carbon dioxide gas detection board, and a photoacoustic oxygen gas detection board.

[0022] As a preferred embodiment of the present invention, the second specific gas sensing card comprises:

[0023] A semiconductor gas detection array air inlet, a semiconductor gas detection array air outlet, and several semiconductor gas detection boards. The semiconductor gas detection board includes a PCB circuit board, a semiconductor gas sensing core is arranged on the PCB circuit board, and the semiconductor gas sensing core is welded to the PCB circuit board through a sensing core pin.

[0024] As a preferred embodiment of the present invention, the second specific gas sensing card includes: a semiconductor methane gas detection board, a semiconductor ethane gas detection board, a semiconductor acetylene gas detection board, a semiconductor ethylene gas detection board, a semiconductor carbon monoxide gas detection board, a semiconductor carbon dioxide gas detection board, and a semiconductor oxygen gas detection board.

[0025] In a second aspect, the present invention also provides a modular multi-redundant online monitoring method for dissolved gas in oil, comprising the following steps:

[0026] The first gas sensing unit and the second gas sensing unit monitor the dissolved gas in the oil and output information of the first gas concentration and the second gas concentration respectively;

[0027] The data processing module receives and calculates the concentration difference between the first gas concentration and the second gas concentration;

[0028] When the concentration difference is greater than the set error threshold, the data processing module outputs a sensing unit maintenance signal.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The detection core of the present invention is composed of two arrays with different detection principles connected in series, and each array can be repaired separately to avoid the monitoring device being offline due to damage to a single array; the first gas sensing unit and the second gas sensing unit respectively use two methods to detect the same type of gas, thereby improving the accuracy and reliability of the detection results, wherein the first specific gas sensing card on the first gas sensing unit detects different gases by photoacoustic detection, and the second specific gas sensing card on the second gas sensing unit detects different gases by semiconductor sensing; two different gas detection methods are used to detect the type and content of dissolved gas in oil, which is convenient for determining the gas type and detecting the content. At the same time, for abnormal monitoring results, it can be judged whether the device is abnormal or whether the first specific gas sensing card or the second specific gas sensing card is abnormal, and the cause of the abnormal fault is determined, which is convenient for troubleshooting.

[0031] 2. The present invention realizes the detection of different types of gases by setting up multiple photoacoustic detection boards for different types of gases. In order to improve the accuracy of detection, one photoacoustic detection board is preferably used only to detect one gas type and content; a single detection board only detects one gas to avoid failure and shutdown of the monitoring device due to damage to one detection board.

[0032] 3. The photoacoustic detection board and the first gas sensing unit are hot-pluggable, and the semiconductor gas detection board and the second gas sensing unit are hot-pluggable. They can be disassembled and replaced without powering off, which is easy to operate, saves time and improves detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a structural diagram of a modular multi-redundant online monitoring device for dissolved gas in oil proposed by the present invention;

[0034] Figure 2 This is a schematic diagram of the first gas sensing unit proposed by the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the first specific gas sensing card proposed by the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of the second specific gas sensing card proposed by the present invention;

[0037] Figure 5 This is a flow chart of the detection method of the modular multi-redundant online monitoring device for dissolved gas in oil proposed by the present invention;

[0038] As shown in the figure:

[0039] 1-first gas sensing unit; 2-second gas sensing unit; 3-first specific gas sensing card; 4-second specific gas sensing card;

[0040] 101-PCB integrated circuit board; 102-sensing unit power supply interface; 103-sensing unit signal interface; 104-sensing board power supply circuit; 105-sensing board temperature control circuit; 106-sensing board signal processing circuit;

[0041] 301-photoacoustic gas detection array air inlet; 302-photoacoustic gas detection array air outlet; 303-photoacoustic detection board;

[0042] 331- narrow linewidth laser light source; 332- photoacoustic cell; 333- pickup; 334- air inlet; 335- air outlet;

[0043] 401-semiconductor gas detection array air inlet; 402-semiconductor gas detection array air outlet; 403-semiconductor gas detection board;

[0044] 431-PCB circuit board; 432-semiconductor gas sensing core; 433-sensing core pin. DETAILED DESCRIPTION

[0045] The specific implementation of the present invention is described below in conjunction with the accompanying drawings and embodiments:

[0046] It should be noted that the structures, colors, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0047] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0048] like Figure 1 As shown, the present invention provides a modular multi-redundant online monitoring device for dissolved gas in oil, comprising:

[0049] A first gas sensing unit 1 and a second gas sensing unit 2 are arranged in series, wherein the first gas sensing unit 1 and the second gas sensing unit 2 are both used to monitor dissolved gas in oil and can output information of a first gas concentration and a second gas concentration respectively;

[0050] A data processing module whose signal is connected to the first gas sensing unit 1 and the second gas sensing unit 2 is provided with an error threshold; the data processing module receives and calculates the concentration difference between the first gas concentration and the second gas concentration; when the concentration difference is greater than the error threshold, the data processing module outputs a sensing unit maintenance signal.

[0051] The detection core of the present invention is composed of two arrays with different detection principles connected in series, and each array can be repaired separately to avoid the monitoring device being offline due to damage to a single array; the same type of gas is detected by the first gas sensing unit and the second gas sensing unit in two ways respectively, thereby improving the accuracy and reliability of the detection results, wherein the first specific gas sensing card on the first gas sensing unit detects different gases by photoacoustic detection, and the second specific gas sensing card on the second gas sensing unit detects different gases by semiconductor sensing; two different gas detection methods are used to detect the type and content of dissolved gas in oil, which is convenient for determining the gas type and detecting the content. At the same time, for abnormal monitoring results, it can be judged whether the device is abnormal or the first specific gas sensing card or the second specific gas sensing card is abnormal, and the cause of the abnormal fault is determined, which is convenient for troubleshooting.

[0052] In the embodiment of the present invention, the first gas sensing unit 1 includes at least two first specific gas sensing cards 3 arranged in series, each of the first specific gas sensing cards 3 is signal-connected to the data processing module, and is configured to detect concentration information of only one specific gas type;

[0053] The second gas sensing unit 2 includes at least two second specific gas sensing cards 4 arranged in series. Each of the second specific gas sensing cards 4 is signal-connected to the data processing module and is constructed to detect concentration information of only one specific gas type.

[0054] The first gas sensing unit 1 and the second gas sensing unit 2 of the present invention are respectively composed of a plurality of detection boards connected in series, and a single detection board only detects one gas, so as to avoid failure and shutdown of the monitoring device due to damage of a detection board. Multiple detection boards can detect different gases at the same time, thereby improving detection efficiency. The first gas sensing unit and the second gas sensing unit are provided with the same number of detection boards. For a gas sensing unit, a plurality of detection boards are provided, and the corresponding second gas sensing unit is also provided with the same number of detection boards. The type of gas detected by the first gas sensing unit is the same as the type of gas detected by the second gas sensing unit, so as to facilitate comparison of detection results of the same type of gas, improve detection accuracy, and judge whether the detection board is normal, so as to facilitate maintenance and replacement.

[0055] Among them, the first specific gas sensing cards arranged adjacent to each other are hot-pluggable; the second specific gas sensing cards arranged adjacent to each other are hot-pluggable. The first specific gas sensing card and the second specific gas sensing card are connected by hot-pluggable means. When it is determined that a detection board is damaged or needs to be replaced, it can be replaced separately without affecting the detection and use of other first specific gas sensing cards or second specific gas sensing cards. The installation and operation are convenient, no power outage is required, and the detection efficiency is high.

[0056] In the embodiment of the present invention, all the first specific gas sensing cards 3 are photoacoustic detection cards; and all the second specific gas sensing cards 4 are semiconductor detection cards.

[0057] The first specific gas sensing card and the second specific gas sensing card are detected by photoacoustic detection and semiconductor detection respectively. Two different detection methods are used for the same detection gas, which improves the reliability and accuracy of the detection results. At the same time, it is helpful to judge and identify the detection performance of the first specific gas sensing card and the second specific gas sensing card. That is, when the detection results of the first specific gas sensing card and the second specific gas sensing card for the same gas are greatly different, it can be judged that the sensing card of the corresponding gas is faulty, and the faulty specific sensing card can be quickly locked and replaced.

[0058] See also Figure 2 In the embodiment of the present invention, the first gas sensing unit 1 comprises:

[0059] A PCB integrated circuit board 101 is provided with a board air inlet 111 and a board air outlet 112; a sensing unit power supply interface 102 and a sensing unit signal interface 103 are provided on the PCB integrated circuit board 101; a sensing board power supply circuit 104, a sensing board temperature control circuit 205 and a sensing board signal processing circuit 106 are provided on the PCB integrated circuit board 101; the sensing unit power supply interface 102 is connected to the sensing board power supply circuit 104; the output end of the sensing board power supply circuit 104 is connected to the sensing board signal processing circuit 106; the output end of the sensing board temperature control circuit 105 and the sensing unit signal interface 103 are connected to the sensing board signal processing circuit 106.

[0060] The first gas sensing unit is connected to the output end of the gas pipeline through the board air inlet, the board air outlet is connected to the second board air inlet of the second gas sensing unit, and the second board air outlet of the second gas sensing unit is connected to the external gas storage tank; the first gas sensing unit and the sensing unit signal interface are connected to the output end of the first specific gas sensing card, and the detection data of the first specific gas sensing card is obtained through the sensing unit signal interface; the sensing board temperature control circuit monitors the temperature of the first specific gas sensing card, and the sensing board power supply circuit provides the working voltage for the first specific gas sensing card to ensure the normal operation of the first specific gas sensing card; the sensing board signal processing circuit processes the received monitoring data of the first specific gas sensing card and sends it to the data processing module.

[0061] The second gas sensing unit has the same structure as the first gas sensing unit. The first gas sensing unit and the second gas sensing unit are connected in series on the gas pipeline. The sensing unit signal interface of the second gas sensing unit is connected to the output end of the second specific gas sensing card to obtain the second monitoring data of the second specific gas sensing card. The gas pipeline is used to provide the first specific gas sensing card and the second specific gas sensing card with dissolved gas in oil, and the first specific gas sensing card and the second specific gas sensing card are connected in series through the gas pipeline.

[0062] See also Figure 3 The first specific gas sensing card 3 is a photoacoustic detection card, including: a photoacoustic gas detection array air inlet 301, a photoacoustic gas detection array air outlet 302, and a plurality of photoacoustic detection boards 303. The photoacoustic detection board 303 includes: a narrow linewidth laser light source 331, a photoacoustic pool 332 and a pickup 333. The two sides of the photoacoustic pool 332 are an air inlet chamber and an air outlet chamber. The air inlet chamber is connected to the air outlet chamber through a photoacoustic pool pipeline. A narrow linewidth laser light source 331 is arranged on the side of the air inlet chamber, an air inlet 334 is arranged on the upper side of the air inlet chamber, an air outlet 335 is arranged at the upper end of the air outlet chamber, and a pickup 333 is arranged on the side of the air outlet chamber. Adjacent photoacoustic detection boards are connected in series through an air path pipeline.

[0063] Among them, the types of photoacoustic detection cards include: photoacoustic methane gas detection board, photoacoustic ethane gas detection board, photoacoustic acetylene gas detection board, photoacoustic ethylene gas detection board, photoacoustic carbon monoxide gas detection board, photoacoustic carbon dioxide gas detection board, and photoacoustic oxygen gas detection board. Photoacoustic detection cards for different gas detections are connected in series through gas pipelines.

[0064] In an embodiment of the present invention, the first gas sensing unit is used to detect the type and content of dissolved gas in oil by photoacoustic gas detection. The detection of different types of gases is achieved by setting up multiple photoacoustic detection boards for different types of gases, that is, one photoacoustic detection board corresponds to detecting one gas type and content; two different gas types can also be monitored on one photoacoustic detection board. In order to improve the accuracy of detection, it is preferred that one photoacoustic detection board is only used to detect one gas type and content.

[0065] When the photoacoustic detection board fails, in order to facilitate replacement, the photoacoustic detection board and the first gas sensing unit are hot-swappable and can be disassembled and replaced without powering off. It is easy to operate, saves time and improves detection efficiency.

[0066] See also Figure 4 The second specific gas sensing card is a semiconductor detection card, wherein the semiconductor detection card includes a metal oxide gas detection card or a metal sulfide gas detection card. In the specific implementation process, a metal oxide gas detection method or a metal sulfide gas detection method can be selected, and the present invention does not limit this. The semiconductor detection card includes:

[0067] A semiconductor gas detection array air inlet 401, a semiconductor gas detection array air outlet 402, and several semiconductor gas detection boards 403. The semiconductor gas detection board 403 includes a PCB circuit board 431, on which a semiconductor gas sensing core 432 is arranged. The semiconductor gas sensing core 432 is welded to the PCB circuit board 431 via a sensing core pin 433.

[0068] The types of semiconductor detection cards include: semiconductor methane gas detection board, semiconductor ethane gas detection board, semiconductor acetylene gas detection board, semiconductor ethylene gas detection board, semiconductor carbon monoxide gas detection board, semiconductor carbon dioxide gas detection board, semiconductor oxygen gas detection board.

[0069] The second gas sensing unit uses semiconductor gas detection to detect the type and content of dissolved gas in the oil. The air inlet of the semiconductor gas detection array is connected to the air outlet of the photoacoustic gas detection array through a gas pipeline. The semiconductor gas detection board is connected in series on the output gas pipeline of the air outlet of the photoacoustic gas detection array. The gas type and content sensed by the semiconductor gas sensing core are processed through the PCB circuit board and sent to the data processing module.

[0070] In order to facilitate the replacement of faulty semiconductor gas detection boards, the semiconductor gas detection boards and the second gas sensing unit are hot-swappable. The semiconductor gas detection boards can be replaced without powering off. The operation is convenient and quick, which improves detection efficiency.

[0071] See also Figure 5 The present invention also provides a modular multi-redundant online monitoring method for dissolved gas in oil, comprising the following steps:

[0072] Step S1, a first gas sensing unit and a second gas sensing unit monitor dissolved gas in oil and output information of a first gas concentration and a second gas concentration respectively;

[0073] Step S2, a data processing module receives and calculates a concentration difference between the first gas concentration and the second gas concentration;

[0074] Step S3: when the concentration difference is greater than the set error threshold, the data processing module outputs a sensing unit maintenance signal.

[0075] The detection core of the present invention is composed of two arrays with different detection principles connected in series. Each array can be repaired separately to avoid the monitoring device being offline due to damage to a single array; the detection array is composed of multiple detection boards in series. A single detection board only detects one gas to avoid the monitoring device being inoperative and shutting down due to damage to a detection board; the detection board has a hot-swap function and can be plugged in and replaced while powered on.

[0076] The present invention adopts photoacoustic detection and semiconductor gas detection to simultaneously perform online monitoring of dissolved gas in oil. The semiconductor gas detection board adopts ultra-sensitive materials to achieve accurate and stable identification of specific dissolved gas blanks in the photoacoustic spectrum. It realizes accurate, stable and reliable detection of hydrocarbon gas, plays a key role in the perception and early warning of insulation defects in large oil-immersed equipment, and promotes the technological progress of oil-immersed equipment status perception.

[0077] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A modular multi-redundant online monitoring device for dissolved gas in oil, characterized in that: include: A first gas sensing unit and a second gas sensing unit are arranged in series, wherein the first gas sensing unit and the second gas sensing unit are both used to monitor dissolved gas in oil and can output information of a first gas concentration and a second gas concentration respectively; A data processing module whose signal is connected to the first gas sensing unit and the second gas sensing unit is provided with an error threshold; the data processing module receives and calculates the concentration difference between the first gas concentration and the second gas concentration; when the concentration difference is greater than the error threshold, the data processing module outputs a sensing unit maintenance signal.

2. The modular multi-redundant online monitoring device for dissolved gas in oil according to claim 1 is characterized in that: The first gas sensing unit includes at least two first specific gas sensing cards arranged in series, each of which is signal-connected to the data processing module and is configured to detect concentration information of only one specific gas type; The second gas sensing unit includes at least two second specific gas sensing cards arranged in series, each of which is signal-connected to the data processing module and is constructed to detect concentration information of only one specific gas type.

3. The modular multi-redundant online monitoring device for dissolved gas in oil according to claim 2 is characterized in that: The adjacent two first specific gas sensing cards are connected by hot plugging; the adjacent two second specific gas sensing cards are connected by hot plugging.

4. The modular multi-redundant online monitoring device for dissolved gas in oil according to claim 2, characterized in that: All of the first specific gas sensing cards are photoacoustic detection cards; and all of the second specific gas sensing cards are semiconductor detection cards.

5. The modular multi-redundant online monitoring device for dissolved gas in oil according to claim 1, characterized in that: The first gas sensing unit comprises: A PCB integrated circuit board, wherein the PCB integrated circuit board is provided with a board air inlet and a board air outlet; The PCB integrated circuit board is provided with a sensing unit power supply interface and a sensing unit signal interface; The PCB integrated circuit board is provided with a sensing board power supply circuit, a sensing board temperature control circuit and a sensing board signal processing circuit; The sensing unit power supply interface is connected to the sensing board power supply circuit; the output end of the sensing board power supply circuit is connected to the sensing board signal processing circuit; the output end of the sensing board temperature control circuit and the sensing unit signal interface is connected to the sensing board signal processing circuit.

6. The modular multi-redundant online monitoring device for dissolved gas in oil according to claim 2, characterized in that: The first specific gas sensing card comprises: A photoacoustic gas detection array air inlet, a photoacoustic gas detection array air outlet, and a plurality of photoacoustic detection boards, wherein the photoacoustic detection boards include: a narrow line width laser light source, a photoacoustic cell, and a pickup; the photoacoustic cell is provided with an air inlet chamber and an air outlet chamber on both sides; the air inlet chamber is connected to the air outlet chamber through a photoacoustic cell pipeline; a narrow line width laser light source is arranged on the side of the air inlet chamber; an air inlet is arranged on the upper side of the air inlet chamber; an air outlet is arranged at the upper end of the air outlet chamber; and a pickup is arranged on the side of the air outlet chamber; adjacent photoacoustic detection boards are connected in series through an air path pipeline.

7. The modular multi-redundant online monitoring device for dissolved gas in oil according to claim 2, characterized in that: The first specific gas sensing card includes: photoacoustic methane gas detection board, photoacoustic ethane gas detection board, photoacoustic acetylene gas detection board, photoacoustic ethylene gas detection board, photoacoustic carbon monoxide gas detection board, photoacoustic carbon dioxide gas detection board, and photoacoustic oxygen gas detection board.

8. The modular multi-redundant online monitoring device for dissolved gas in oil according to claim 2, characterized in that: The second specific gas sensing card comprises: A semiconductor gas detection array air inlet, a semiconductor gas detection array air outlet, and several semiconductor gas detection boards. The semiconductor gas detection board includes a PCB circuit board, a semiconductor gas sensing core is arranged on the PCB circuit board, and the semiconductor gas sensing core is welded to the PCB circuit board through a sensing core pin.

9. The modular multi-redundant online monitoring device for dissolved gas in oil according to claim 2, characterized in that: The second specific gas sensing card includes: a semiconductor methane gas detection board, a semiconductor ethane gas detection board, a semiconductor acetylene gas detection board, a semiconductor ethylene gas detection board, a semiconductor carbon monoxide gas detection board, a semiconductor carbon dioxide gas detection board, and a semiconductor oxygen gas detection board.

10. A modular multi-redundant online monitoring method for dissolved gas in oil, characterized in that: The modular multi-redundant online monitoring device for dissolved gas in oil as claimed in any one of claims 1 to 9 comprises the following steps: The first gas sensing unit and the second gas sensing unit monitor the dissolved gas in the oil and output information of the first gas concentration and the second gas concentration respectively; The data processing module receives and calculates the concentration difference between the first gas concentration and the second gas concentration; When the concentration difference is greater than the set error threshold, the data processing module outputs a sensing unit maintenance signal.

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