Gas relay fault gas monitoring device

Abstract

The utility model discloses a gas relay fault gas monitoring device. The device comprises a gas monitoring tank body; a gas chamber is formed in the gas monitoring tank body; a gas taking pipe communicated with the gas chamber is arranged at the bottom of the gas monitoring tank body, a first electric valve is arranged on the gas taking pipe, and the first electric valve is opened under the condition of receiving a gas taking control signal and enables fault gas in the gas relay to enter the gas chamber through the gas taking pipe; an exhaust pipe communicated with outside air is arranged at the top of the gas monitoring tank body, a second electric valve is arranged on the exhaust pipe, the second electric valve is electrically connected with the gas sensor, and the second electric valve is opened under the condition of receiving the exhaust control signal and enables fault gas in the gas chamber to be exhausted to the air through the exhaust pipe; the gas isolation module is used for filling and sealing the fault gas in the gas chamber, and is also used for carrying out amplification or shrinkage limitation on a fault gas filling area of the gas isolation module according to the change of the volume of the fault gas in the gas chamber, so that the detection accuracy of gas components is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of transformers, in particular to a gas relay fault gas monitoring device. BACKGROUND

[0002] Combustible gas generated by internal faults of a transformer usually floats to the upper cover of the transformer oil tank and enters the gas collection chamber of the gas relay through a pipeline. When the gas in the gas relay reaches a certain amount or the gas generated by a serious fault drives the oil flow to impact the baffle of the gas relay, the gas relay will send an alarm signal or a trip signal, which has high sensitivity and rapidity for internal fault non-electricity protection of the transformer.

[0003] Generally, combustible gas is concentrated in the gas collection chamber of the gas relay, and air enters due to gas leakage or maintenance. Although the transformer gas relay will send an alarm when the gas in the gas collection chamber reaches a certain amount, the gas composition in the transformer is analyzed by manually taking gas for analysis after the alarm, which makes it difficult to quickly distinguish the misoperation of the gas relay caused by air and the like, increases the maintenance cost, and at the same time, the alarm indicates that the transformer body may have a fault, and manual gas taking has a certain risk. Therefore, researchers have considered integrating the traditional gas relay with gas detection sensors and the like to form an intelligent gas relay with online gas monitoring, improve the reliability and intelligent level of non-electricity protection, and have important significance for ensuring the safe operation of the transformer.

[0004] A Chinese invention patent with the patent number CN115166163A discloses a gas relay gas online monitoring method, which comprises the following steps: in response to the occurrence of gas in the gas relay, detecting the decrease of the liquid level in the gas collection chamber, and calculating the gas collection speed according to the speed of the decrease of the liquid level; when the liquid level decreases to a preset lower limit position, a valve opening signal is generated to control the opening of the valve, so that the gas in the gas collection chamber flows to the gas testing chamber, and the gas is detected to obtain the corresponding gas species and content, thereby causing the liquid level in the gas collection chamber to rise; when the liquid level rises to a preset upper limit position, a valve closing signal is generated to control the closing of the valve. Since the device opens and closes the valve by electricity, the gas diffuses from the cavity to the gas detection part at the upper end, but the gas detection part is directly connected with the outside through the exhaust port, and air is difficult to be completely replaced by fault gas during detection, so the concentration of fault gas detected by the sensor may be low; on the other hand, the fault gas diffused to the detection part each time the electromagnetic valve is opened may not be completely exhausted, which may affect the detection of the composition of the fault gas. UTILITY MODEL CONTENT

[0005] Therefore, in order to solve the above technical problems, the application provides a gas relay fault gas monitoring device, which solves the technical problems that the gas detection part is directly connected with the outside through the exhaust port, and the air is difficult to be completely replaced by the fault gas during detection, so that the fault gas concentration detected by the sensor may be low; on the other hand, the fault gas detected last time may not be completely exhausted, which may affect the detection of the fault gas composition when the electromagnetic valve is opened each time to diffuse the fault gas to the detection part.

[0006] The application provides a gas relay fault gas monitoring device, which comprises a gas monitoring tank body, wherein a gas cavity is arranged in the gas monitoring tank body.

[0007] A gas sensor and a gas isolation module are arranged in the gas cavity.

[0008] A gas taking pipe is arranged at the bottom of the gas monitoring tank body and is in communication with the gas cavity, a first electric valve is arranged on the gas taking pipe, and the first electric valve is used to be opened when a gas taking control signal is received, so that the fault gas in the gas relay enters the gas cavity through the gas taking pipe; wherein the gas taking control signal is generated when the volume of the fault gas in the gas relay reaches a preset gas volume threshold.

[0009] An exhaust pipe is arranged at the top of the gas monitoring tank body and is in communication with the outside air, a second electric valve is arranged on the exhaust pipe, the second electric valve is electrically connected with the gas sensor, and the second electric valve is used to be opened when an exhaust control signal is received, so that the fault gas in the gas cavity is exhausted to the air through the exhaust pipe; wherein the exhaust control signal is generated after the gas sensor completes the test of the fault gas composition.

[0010] The gas isolation module comprises a fault gas filling area, the fault gas filling area is used to fill and seal the fault gas in the gas cavity, and is amplified or reduced limitedly with the change of the volume of the fault gas in the gas cavity under the preset gas pressure of a non-fault gas filling area; wherein the non-fault gas filling area is an area in the gas cavity except the fault gas filling area, and the non-fault gas filling area is filled with gas.

[0011] Preferably, the device further comprises a liquid level sensor.

[0012] The liquid level sensor is placed in the gas relay.

[0013] The gas taking pipe extends to a gas taking port in the gas relay.

[0014] The liquid level sensor is electrically connected with the first electric valve, and is used to determine the volume of the fault gas in the gas relay according to the change of the oil liquid level in the gas relay; and is also used to generate the gas taking control signal when the volume of the fault gas in the gas relay reaches a preset gas volume threshold, and send the gas taking control signal to the first electric valve.

[0015] Preferably, the first electric valve is a one-way electric valve.

[0016] Preferably, the second electric valve is a one-way electric valve.

[0017] Preferably, the gas isolation module comprises an EVOH film capsule.

[0018] The EVOH film capsule is installed on the inner side wall of the gas chamber, and the EVOH film capsule and the inner side wall connected with the EVOH film capsule form the fault gas filling area.

[0019] The EVOH film capsule changes according to the volume of the fault gas, and limits the volume of the fault gas filling area under the preset gas pressure of the non-fault gas filling area.

[0020] The gas sensor is arranged in the fault gas filling area.

[0021] The gas taking pipe and the gas discharging pipe both extend to the inside of the fault gas filling area through the EVOH film capsule.

[0022] Preferably, the gas isolation module comprises an upper isolation plate, a lower isolation plate and a piston.

[0023] The upper isolation plate and the lower isolation plate are arranged on both sides of the gas sensor correspondingly.

[0024] The fixed end of the upper isolation plate and the fixed end of the lower isolation plate are both fixedly connected with the inner side wall of the gas chamber where the gas sensor is arranged.

[0025] The free end of the upper isolation plate and the free end of the lower isolation plate both extend to the inner side wall of the gas chamber away from the gas sensor, and the free end of the upper isolation plate and the free end of the lower isolation plate both leave a gap with the inner side wall of the gas chamber away from the gas sensor.

[0026] The piston is arranged between the upper isolation plate and the lower isolation plate, and the upper isolation plate, the lower isolation plate, the piston and the inner side wall where the gas sensor is arranged form the fault gas filling area.

[0027] The piston reciprocates along the length direction of the fault gas filling area, and is also used for changing the volume of the fault gas and limiting the volume of the fault gas filling area under the preset gas pressure of the non-fault gas filling area;

[0028] The exhaust pipe extends through the upper isolation plate and extends to the inside of the fault gas filling area;

[0029] The gas taking pipe extends through the lower isolation plate and extends to the inside of the fault gas filling area.

[0030] Preferably, the preset gas pressure of the non-fault gas filling area is between preset gas pressure range thresholds, and the preset gas pressure range thresholds are the sum of one standard atmospheric pressure and the gas pressure in the gas relay caused by the height difference of the oil pillow of the gas relay and the transformer.

[0031] Preferably, the gas sensor is one of a hydrogen sensor, a methane sensor, an ethane sensor, an ethylene sensor, an acetylene sensor, a carbon monoxide sensor and a carbon dioxide sensor, or a combination of two or more of the above sensors.

[0032] From the above technical solutions, the utility model discloses a gas chamber upper and lower ends are communicated with the gas taking pipe and the exhaust pipe respectively, and the first electric valve and the second electric valve are installed in the gas taking pipe and the exhaust pipe respectively, the first electric valve is opened under the condition of receiving the gas taking control signal, and the fault gas in the gas relay enters the gas chamber from the gas taking pipe, so that the gas taking efficiency is improved, and simultaneously, the second electric valve is opened under the condition of receiving the exhaust control signal, and the fault gas in the gas chamber is discharged to the air from the exhaust pipe, which avoids that the gas chamber is directly connected with the outside through the exhaust port, the air is difficult to be completely replaced by the fault gas during detection, the fault gas concentration detected by the gas sensor is improved, the gas isolation module fills and seals the fault gas in the gas chamber, and the volume of the fault gas in the gas chamber is enlarged or reduced under the preset gas pressure of the non-fault gas filling area, without electrical control, the gas isolation module cooperates with the first electric valve and the second electric valve respectively, the smooth entry and smooth extrusion of the fault gas are realized, the detection error caused by the contact between the gas chamber and the air and the incomplete discharge of the fault gas is also avoided, and the gas component measurement accuracy in the gas relay device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a structure schematic view of a gas relay fault gas monitoring device after filling with fault gas.

[0034] Figure 2It is a structural schematic view of a gas relay fault gas monitoring device cooperating with a gas relay.

[0035] Figure 3 It is a structural schematic view of a gas relay fault gas monitoring device before filling with fault gas.

[0036] Figure 4 It is a structural schematic view of another preferred embodiment of a gas relay fault gas monitoring device. DETAILED DESCRIPTION

[0037] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be replaceably connected, or it can be integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0040] As Figure 1 shown, the present application provides a gas relay fault gas monitoring device, which comprises: a gas monitoring tank body 10; a gas cavity 20 is formed in the gas monitoring tank body 10.

[0041] The gas cavity 20 is provided with a gas sensor 21 and a gas isolation module 22.

[0042] The gas chamber 20 is a closed cavity, and a plurality of gas sensors 21 are installed on the inner side wall of the gas chamber 20 to detect the gas components of the fault gas in the gas chamber 20.

[0043] In some embodiments, the gas sensor 21 is one of a hydrogen sensor, a methane sensor, an ethane sensor, an ethylene sensor, an acetylene sensor, a carbon monoxide sensor, and a carbon dioxide sensor, or a combination of two or more of the above sensors.

[0044] The bottom of the gas monitoring tank 10 is provided with a gas taking pipe 30 connected to the gas chamber 20, and the first electric valve 31 is provided on the gas taking pipe 30. The first electric valve 31 is used to open when receiving the gas taking control signal, and the fault gas in the gas relay enters the gas chamber 20 through the gas taking pipe 30. The gas taking control signal is generated when the volume of the fault gas in the gas relay reaches the preset gas volume threshold.

[0045] It can be understood that the first electric valve 31 is in a closed state in the initial state, and the first electric valve 31 is opened when the gas taking control signal is received, and the fault gas in the gas relay enters the gas chamber 20 through the gas taking pipe 30.

[0046] In order to improve the gas taking efficiency and accuracy, and to avoid the possibility of low concentration of fault gas detected by the gas sensor 21, in the embodiment of the present application, the first electric valve 31 is a one-way electric valve, and the gas flow direction of the first electric valve 31 is from the outside of the gas chamber 20 to the inside of the gas chamber 20.

[0047] The top of the gas monitoring tank 10 is provided with an exhaust pipe 40 connected to the outside air, and the second electric valve 41 is provided on the exhaust pipe 40. The second electric valve 41 is electrically connected to the gas sensor 21, and the second electric valve 41 is used to open when receiving the exhaust control signal, and the fault gas in the gas chamber 20 is discharged to the air through the exhaust pipe 40. The exhaust control signal is generated after the gas sensor 21 completes the test of the fault gas components.

[0048] It can be understood that the second electric valve 41 is in a closed state in the initial state, and the second electric valve 41 is opened when the exhaust control signal is received, and the fault gas in the gas chamber 20 is discharged to the air through the exhaust pipe 40.

[0049] In order to avoid the situation that the fault gas is not completely discharged after the last detection when the electromagnetic valve is opened each time to diffuse the fault gas to the detection part, which may affect the detection of the fault gas components, in the embodiment of the present application, the second electric valve 41 is a one-way electric valve, and the gas flow direction of the second electric valve 41 is from the inside of the gas chamber 20 to the outside of the gas chamber 20.

[0050] The gas isolation module 22 includes a fault gas filling area 23 for filling and sealing the fault gas in the gas chamber 20 and expanding or contracting in response to the volume change of the fault gas in the gas chamber 20 at a preset gas pressure of the non-fault gas filling area.

[0051] The gas filled in the non-fault gas filling area can be air or inert gas, etc.

[0052] The gas isolation module 22 fills and seals the fault gas entering the gas chamber 20 and isolates the fault gas from other gases in the gas chamber 20, thereby enhancing the detection concentration of the gas. At the same time, the gas isolation module 22 changes with the volume change of the fault gas in the gas chamber 20, and by pre-setting the gas pressure of the non-fault gas filling area and expanding or contracting in response to the volume change of the fault gas in the gas chamber 20 at the preset gas pressure of the non-fault gas filling area, the smooth entry and smooth extrusion of the fault gas can be achieved without additional electrical control, further improving the gas composition measurement accuracy and measurement efficiency in the gas relay device. In addition, the design of the gas isolation module 22 also avoids direct contact between the fault gas and the external air, effectively preventing the escape and pollution of the fault gas, and ensuring the accuracy and reliability of the gas composition measurement. In specific implementation, the structure and material of the gas isolation module 22 can be adjusted to adapt to the characteristics and measurement requirements of different fault gases. At the same time, the control logic and parameter setting of the first electric valve 31 and the second electric valve 41 can be optimized to further improve the efficiency and accuracy of gas sampling and exhaust.

[0053] In summary, the gas relay fault gas monitoring device provided by the utility model has the advantages of simple structure, convenient operation, accurate measurement, high reliability, etc., and is suitable for fault gas monitoring and diagnosis of various gas relays.

[0054] It should be noted that, in the embodiment of the present application, the upper and lower ends of the gas chamber are respectively communicated with the gas taking pipe and the gas discharging pipe, and the first electric valve and the second electric valve are respectively installed in the gas taking pipe and the gas discharging pipe. The first electric valve is opened when receiving the gas taking control signal, and the fault gas in the gas relay enters the gas chamber through the gas taking pipe, so as to improve the gas taking efficiency. Meanwhile, the second electric valve is opened when receiving the gas discharging control signal, and the fault gas in the gas chamber is discharged to the air through the gas discharging pipe, avoiding that the gas chamber is directly connected with the outside through the gas discharging port, and the air is difficult to be completely replaced by the fault gas during detection, so as to improve the fault gas concentration detected by the gas sensor. Meanwhile, the fault gas in the gas chamber is filled and closed by the gas isolation module, and is enlarged or reduced according to the volume change of the fault gas in the gas chamber. The gas isolation module cooperates with the first electric valve and the second electric valve respectively, so as to realize the smooth entering and extruding of the fault gas, and avoid the detection error caused by the contact between the gas chamber and the air and the incomplete discharge of the fault gas, and improve the gas composition measurement accuracy of the gas relay device.

[0055] In actual application, as shown in FIG. 1, the gas relay fault gas monitoring device provided by the embodiment of the present application cooperates with the gas relay. One end of the gas relay is connected with the oil tank of the transformer through a pipeline, and the other end is communicated with the oil pillow of the transformer through a pipeline. There is a certain height difference between the oil level in the oil pillow and the oil level in the gas relay. Meanwhile, the height difference between the oil level in the oil pillow and the oil level in the gas relay has a great influence on the gas pressure in the gas relay, thereby affecting the gas taking efficiency of the gas relay fault gas monitoring device. Figure 2 As a priority scheme, the preset gas pressure of the non-fault gas filling area is located between the preset gas pressure range threshold value, and the preset gas pressure range threshold value is the sum of one standard atmospheric pressure and the gas pressure in the gas relay caused by the height difference between the gas relay and the oil pillow of the transformer. The gas isolation module can work normally under the preset gas pressure of the non-fault gas filling area, and will not be affected by the overlarge or over-small gas pressure. In addition, by setting a reasonable preset gas pressure range threshold value, the leakage of the fault gas in the gas chamber caused by the change of the external gas pressure can be avoided, and the reliability and stability of the gas relay fault gas monitoring device are further improved.

[0056] In the embodiment of the present application, the gas relay fault gas monitoring device further comprises a liquid level sensor 50.

[0057] The liquid level sensor 50 is placed in the gas relay.

[0058] The liquid level sensor 50 is placed in the gas relay.

[0059] The gas taking pipe 30 is arranged at a gas taking port in the gas relay;

[0060] The liquid level sensor 50 is electrically connected with the first electric valve 31, and is configured to determine the volume of the fault gas in the gas relay according to the change of the oil liquid level in the gas relay, and to generate a gas taking control signal and send the gas taking control signal to the first electric valve 31 when the volume of the fault gas in the gas relay reaches a preset gas volume threshold.

[0061] It can be understood that the working process of the gas relay fault gas monitoring device provided by the embodiments of the present application is as follows:

[0062] When a fault occurs in the oil tank of the transformer, the fault gas floats and moves to the gas relay through the oil pipe;

[0063] The liquid level sensor 50 monitors the change of the liquid level in the gas relay, can output the gas generation rate, and can also send a gas taking control signal to the first electric valve 31 when the volume of the fault gas accumulates to a certain gas volume threshold.

[0064] The first electric valve 31 is opened, and since the height difference between the oil pillow of the transformer and the oil liquid level of the gas relay has a great influence on the gas pressure of the gas relay, the fault gas in the gas relay can enter the fault gas filling area 23 of the gas isolation module 22 through the first electric valve 31 under the pressure of the oil pillow.

[0065] The gas sensor 21 collects the fault gas and measures the gas composition of the fault gas, and after the gas composition measurement is completed, the gas sensor 21 sends a signal to the first electric valve 31 and the second electric valve 41, so that the first electric valve 31 is closed and the second electric valve 41 is opened. Since the pressure inside the gas chamber 20 is greater than 1 standard atmosphere, the fault gas in the gas isolation module 22 will be discharged through the exhaust pipe 40 under the pressure of the gas in the gas chamber 20, and at the same time, the fault gas is squeezed out, and it is also ensured that air cannot enter. After the gas is discharged, the second electric valve 41 is closed and returns to the initial state for the next fault gas detection.

[0066] In the design, according to the installation position of the gas relay, the pressure difference caused by the height difference between the oil pillow of the transformer and the gas relay is used to realize smooth collection and discharge of the fault gas without using a compressor, an air extraction device or other external pressure.

[0067] As a preferred embodiment, as shown in Figure 1 and 3 The gas isolation module 22 includes an EVOH film capsule 221.

[0068] The EVOH film capsule 221 is made of EVOH (Ethylene-Vinyl Alcohol Copolymer) material, which can provide obvious barrier properties to protect the capsule contents from environmental factors such as moisture, oxygen, etc.

[0069] The EVOH film capsule 221 is installed on the inner side wall of the gas chamber 20, and the EVOH film capsule 221 and the inner side wall connected with the EVOH film capsule 221 form a fault gas filling area 23.

[0070] The area of the gas chamber except the fault gas filling area is filled with gas, and the gas pressure of the area except the fault gas filling area is between the preset gas pressure range threshold, which is the sum of one standard atmospheric pressure and the gas pressure in the gas relay caused by the height difference between the gas relay and the oil pillow of the transformer.

[0071] The lower limit of the gas pressure range threshold is one standard atmospheric pressure, and the upper limit of the gas pressure range threshold is the sum of one standard atmospheric pressure and the gas pressure in the gas relay caused by the height difference between the gas relay and the oil pillow of the transformer, wherein the gas pressure in the gas relay caused by the height difference between the gas relay and the oil pillow of the transformer can be obtained by monitoring the gas pressure in the gas relay.

[0072] The EVOH film capsule 221 changes according to the volume of the fault gas, and limits the volume of the fault gas filling area 23 under the preset gas pressure of the non-fault gas filling area.

[0073] The gas sensor 21 is arranged in the fault gas filling area 23.

[0074] The gas suction pipe 30 and the exhaust pipe 40 both extend to the inside of the fault gas filling area 23 through the EVOH film capsule 221.

[0075] The EVOH film capsule 221 is provided with through holes matched with the structures of the gas suction pipe 30 and the exhaust pipe 40, and the through holes are sealed to avoid gas leakage.

[0076] It can be understood that, as shown in Figure 3 The volume of the EVOH film capsule 221 is small when it is not filled with fault gas, and when the first electric valve 31 is opened, the gas pressure in the gas relay caused by the height difference between the oil pillow of the transformer and the oil level of the gas relay makes the volume of the EVOH film capsule increase as the fault gas is filled, and the EVOH film capsule 221 is as shown in Figure 1As shown, when the EVOH film capsule 221 is filled with fault gas, the volume of the EVOH film capsule 221 increases. When the gas is discharged, in the case that the second electric valve 41 is opened, the non-fault gas filling area is filled with gas, and the gas pressure in the non-fault gas filling area is between the sum of the gas pressure in the gas relay and the pressure caused by the height difference of the oil pillow of the transformer and one standard atmosphere, so that the EVOH film capsule 221 can be squeezed and contracted, and the fault gas in the EVOH film capsule 221 can be discharged to the air until the EVOH film capsule 221 returns to the state as shown in Figure 3 As shown, when the EVOH film capsule 221 is filled with fault gas, the volume of the EVOH film capsule 221 increases. When the gas is discharged, in the case that the second electric valve 41 is opened, the non-fault gas filling area is filled with gas, and the gas pressure in the non-fault gas filling area is between the sum of the gas pressure in the gas relay and the pressure caused by the height difference of the oil pillow of the transformer and one standard atmosphere, so that the EVOH film capsule 221 can be squeezed and contracted, and the fault gas in the EVOH film capsule 221 can be discharged to the air until the EVOH film capsule 221 returns to the state as shown in

[0077] In addition, the design of the EVOH film capsule 221 also has excellent flexibility and durability, which can adapt to the frequent changes of the volume of the fault gas in the gas chamber 20, while maintaining its structural integrity and sealing performance. The selection of such materials not only improves the reliability and service life of the gas relay fault gas monitoring device, but also ensures the continuity and accuracy of the fault gas composition measurement.

[0078] In specific implementation, the installation and maintenance of the EVOH film capsule 221 are also relatively simple. It can be installed on the inner side wall of the gas chamber 20 by simple operation, and sealedly connected with the gas taking pipe 30 and the gas discharging pipe 40. When maintenance or replacement is needed, it can be easily removed for inspection and repair, thereby reducing the operation cost and maintenance difficulty of the device.

[0079] In the design, on the one hand, the EVOH film capsule 221 is used to wrap the gas sensor 21 to form a kind of contractible and inflatable detection chamber, realizing the entry and extrusion of the fault gas; on the other hand, according to the installation position of the gas relay, the pressure in the sealed gas chamber except the EVOH film capsule 221 is greater than 1 atmosphere, less than 1 atmosphere + the pressure caused by the height difference of the oil pillow, and the smooth collection and discharge of the fault gas without the use of external pressure such as compressor and air extractor are realized by using the pressure difference.

[0080] In actual application, the EVOH film capsule 221 is not the only capsule material, and materials resistant to oil, air-tight and contractible and inflatable can also be used to make such capsules.

[0081] As another preferred embodiment, as shown in Figure 4 The gas isolation module 22 includes an upper isolation plate 222, a lower isolation plate 223 and a piston 224.

[0082] The upper isolation plate 222 and the lower isolation plate 223 are correspondingly arranged on both sides of the gas sensor 21.

[0083] The fixed end of the upper isolation plate 222 and the fixed end of the lower isolation plate 223 are fixedly connected with the inner side wall in the gas chamber 20 where the gas sensor 21 is located;

[0084] The free end of the upper isolation plate 222 and the free end of the lower isolation plate 223 extend to the inner side wall in the gas chamber 20 away from the gas sensor 21, and the free end of the upper isolation plate 222 and the free end of the lower isolation plate 223 are both left with a gap 25 between the inner side wall in the gas chamber 20 away from the gas sensor 21;

[0085] The piston 224 is arranged between the upper isolation plate 222 and the lower isolation plate 223, and the upper isolation plate 222, the lower isolation plate 223, the piston 224 and the inner side wall where the gas sensor 21 is located form a fault gas filling area 23;

[0086] The piston 224 reciprocates along the length direction of the fault gas filling area 23, and is also used for limiting the volume of the fault gas filling area 23 according to the volume change of the fault gas and under the preset gas pressure of the non-fault gas filling area.

[0087] The exhaust pipe 40 penetrates through the upper isolation plate 222 and extends to the inside of the fault gas filling area 23;

[0088] The gas taking pipe 30 penetrates through the lower isolation plate 223 and extends to the inside of the fault gas filling area 23.

[0089] The upper isolation plate 222 and the lower isolation plate 223 are respectively provided with through holes for the exhaust pipe 40 and the gas taking pipe 30 to penetrate, and the through holes are sealed to avoid gas leakage.

[0090] It can be understood that in the initial state of the piston 224 when the fault gas filling area 23 is not filled with fault gas, the non-fault gas filling area in the gas chamber is filled with gas, and the gas pressure of the non-fault gas filling area is between the sum of the gas pressure in the gas relay caused by the height difference between the gas relay and the oil pillow of the transformer and one standard atmospheric pressure, so that the piston 224 can be subjected to the air pressure thrust through the gap 25 between the upper isolation plate 222 and the lower isolation plate 223 and the inner side wall, and the fault gas filling area 23 is compressed, so that the position of the piston 224 is close to the gas sensor 21, and the fault gas filling area 23 is small.

[0091] With the opening of the first electric valve 31, the fault gas in the gas relay enters the fault gas filling area 23 under the oil pillow pressure, and the piston 224 is subjected to the pressure of the fault gas and moves outward along the length direction of the fault gas filling area 23, thereby expanding the volume of the fault gas filling area 23 to accommodate the entry of the fault gas. After the fault gas completely enters and fills the fault gas filling area 23, the gas sensor 21 starts to measure the gas composition of the fault gas. During the measurement process, the gas sensor 21 can accurately capture the composition information of the fault gas, providing reliable data support for subsequent fault diagnosis.

[0092] When the gas composition measurement is completed, the gas sensor 21 sends a signal to the first electric valve 31 and the second electric valve 41, instructing them to switch states. After receiving the signal, the first electric valve 31 is closed, cutting off the channel for the fault gas to enter the fault gas filling area 23. At the same time, after receiving the signal, the second electric valve 41 is opened, allowing the fault gas to be discharged from the exhaust pipe 40 to the air. Since the pressure inside the gas chamber 20 is greater than one standard atmosphere, the fault gas is smoothly discharged under the action of pressure, and at the same time, the entry of air into the gas chamber 20 is avoided, ensuring the accuracy of gas detection.

[0093] The above-described embodiments are merely used to illustrate the technical solutions of the present application, but not to limit the same; even though the foregoing embodiments of the present application have been described in detail, those skilled in the art should understand: they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A gas relay fault gas monitoring device, characterized in that, The utility model relates to a kind of gas monitoring tank body;Gas cavity is opened in the gas monitoring tank body;Gas sensor and gas isolation module are installed in the gas cavity;The bottom of the gas monitoring tank body is equipped with gas extraction pipe being communicated with the gas cavity, and the first electric valve is equipped on the gas extraction pipe;The first electric valve is opened when receiving gas extraction control signal, and the fault gas in gas relay is entered into the gas cavity by the gas extraction pipe;Wherein, the gas extraction control signal is generated when the volume of fault gas in the gas relay reaches preset gas volume threshold value;The top of the gas monitoring tank body is equipped with exhaust pipe being communicated with ambient air, and the second electric valve is equipped on the exhaust pipe;The second electric valve is electrically connected with the gas sensor, and the second electric valve is opened when receiving exhaust control signal, and the fault gas in the gas cavity is discharged to air by the exhaust pipe;Wherein, the exhaust control signal is generated after the gas sensor tests the composition of fault gas is completed;The gas isolation module includes fault gas filling area, and the fault gas filling area is used to fill and seal the fault gas in the gas cavity, and under the preset gas pressure of non-fault gas filling area, it is amplified or reduced limit with the volume change of fault gas in the gas cavity;Wherein, the non-fault gas filling area is the area except the fault gas filling area in the gas cavity, and the non-fault gas filling area is filled with gas. Further comprising: liquid level sensor; The liquid level sensor is placed in the gas relay; The gas extraction pipe extends the gas extraction port in the gas relay; The liquid level sensor is electrically connected with the first electric valve, and the liquid level sensor is used to determine the volume of fault gas in the gas relay according to the change of oil level in the gas relay;Also used to generate the gas extraction control signal when the volume of fault gas in the gas relay reaches preset gas volume threshold value, and the gas extraction control signal is sent to the first electric valve.

2. The apparatus according to claim 1, wherein The first electric valve is a one-way electric valve. The second electric valve is a one-way electric valve. The gas isolation module includes EVOH film capsule; The EVOH film capsule is installed on the inner side wall of the gas cavity, and the EVOH film capsule and the inner side wall connected with the EVOH film capsule form the fault gas filling area; The EVOH film capsule limits the volume of fault gas filling area according to the volume change of fault gas and under the preset gas pressure of non-fault gas filling area; 3. The apparatus for monitoring a fault gas of a gas relay according to claim 1, wherein The gas sensor is arranged in the fault gas filling area; 4. The apparatus for monitoring a fault gas of a gas relay according to claim 1, wherein The gas extraction pipe and the exhaust pipe both pass through the EVOH film capsule and extend to the inside of the fault gas filling area.

5. The apparatus for monitoring a fault gas of a gas relay according to claim 1, wherein The gas isolation module includes upper isolation plate, lower isolation plate and piston; The upper isolation plate and the lower isolation plate are correspondingly arranged on both sides of the gas sensor. ​ ​ ​ 6. The apparatus for monitoring for gas relay malfunction according to claim 1, wherein ​ ​ The fixed end of the upper isolation plate and the fixed end of the lower isolation plate are fixedly connected with the inner side wall of the gas chamber where the gas sensor is located; The free end of the upper isolation plate and the free end of the lower isolation plate extend to the inner side wall of the gas chamber away from the gas sensor, and a gap is left between the free end of the upper isolation plate and the free end of the lower isolation plate and the inner side wall of the gas chamber away from the gas sensor; The piston is arranged between the upper isolation plate and the lower isolation plate, and the upper isolation plate, the lower isolation plate, the piston and the inner side wall where the gas sensor is located form the fault gas filling area; The piston reciprocates along the length direction of the fault gas filling area, and is further configured to change the volume of the fault gas and limit the volume of the fault gas filling area under the preset gas pressure of the non-fault gas filling area; The exhaust pipe extends through the upper isolation plate and extends to the inside of the fault gas filling area; The gas taking pipe extends through the lower isolation plate and extends to the inside of the fault gas filling area.

7. The apparatus according to any one of claims 1 to 6, wherein The preset gas pressure of the non-fault gas filling area is between preset gas pressure range thresholds, and the preset gas pressure range thresholds are the sum of one standard atmospheric pressure and the gas pressure in the gas relay caused by the height difference of the oil pillow of the gas relay and the transformer.

8. The apparatus for monitoring for gas relay malfunction according to claim 1, wherein The gas sensor is one of a hydrogen sensor, a methane sensor, an ethane sensor, an ethylene sensor, an acetylene sensor, a carbon monoxide sensor and a carbon dioxide sensor, or a combination of two or more of the above sensors.

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