Automatic exhaust and air extraction device for transformer

Abstract

A transformer automatic exhaust and gas collection device relates to the transformer field. The device connects an electric discharge controller in series between the automatic gas discharger and the real-time gas sample retainer, and uses the discharge controller to receive the alarm signal generated by the gas relay and the gas presence signal generated by the automatic gas discharger. While providing the transformer with an automatic exhaust and electronically controlled timed exhaust, it also provides a simple, convenient, accurate and time-independent transformer gas sampling method for laboratory personnel. It allows samplers to avoid the time when exhaust and gas collection coincide with the time point when the potential transformer is prone to explosion, thereby ensuring the safety of operators. In addition, the combined use of the gas presence signal and the gas alarm signal can accurately reflect the relationship between the time when the transformer generates gas, the speed of accumulation and the operating status of the transformer, and can also be used as a signal source for sound prompts, information recording and storage, computer monitoring and Internet of Things online, providing a basis for subsequent processing.

Description

Technical Field

[0001] The invention relates to the field of transformers, and in particular to an automatic exhaust and air intake device for transformers. Background Art

[0002] The oil-immersed transformers currently used in the power industry will generate gas during their operation. The gas relay will send out an alarm signal. The residual oil in the pipeline will be released using the oil drain valve of the gas guide box, and then the gas will be released and taken out through the gas valve and gas bottle. This alternating oil and gas extraction method requires on-site manpower operation, and the operation procedure is complicated and time-consuming. Laboratory personnel need to operate at close range, which is prone to safety risks. Summary of the invention

[0003] In view of the deficiencies in the prior art, an object of the present invention is to provide an automatic exhaust and air intake device for a transformer.

[0004] The technical solution adopted by the present invention is: a transformer automatic exhaust and gas extraction device, first of all, the oil and gas alternating exhaust mode is changed to the oil-blocking exhaust mode, and a gas presence signal is added to make up for the signal deficiency of the gas relay, and the manual exhaust and gas extraction are changed to electric automatic control exhaust and electric remote control exhaust and timely gas sample retention and timed gas sample retention, so that the transformer can be automatically exhausted, and a gas sample is always reserved somewhere and can be taken at any time. The technical points are that it includes an automatic gas exhauster, an electric exhaust controller and a real-time gas sample retainer;

[0005] The gas inlet end of the automatic gas discharger is connected to the gas guide box interface of the gas relay in the transformer, and is used to receive the gas from the gas relay;

[0006] The air inlet end of the discharge electric controller is connected to the gas discharge port of the gas automatic discharger, and is used to receive the gas discharged from the gas relay and the alarm signal generated and the gas presence signal generated by the gas automatic discharger, and to control the discharge of gas from the gas automatic discharger to the real-time gas sample retainer according to the above two signals;

[0007] The air inlet end of the instantaneous gas sample retainer is connected to the air outlet end of the discharge electric controller, and is used to receive the discharged gas instantaneously or regularly to retain the instantaneous gas sample.

[0008] In the above scheme, the automatic gas discharger includes an upper cover with a gas discharge port, a cylinder, a float, a normally open reed switch and a hollow bolt. The upper cover is buckled on the opening of the cylinder to form a sealed assembly of the outer shell. The upper end of the float is provided with a cone for sealing the gas discharge port of the upper cover, and the lower end of the float is provided with a magnet used in conjunction with the normally open reed switch. A hollow bolt connected to the gas guide box interface of the gas relay is also provided on the cylinder.

[0009] In the above scheme, the lower central axis of the float is connected to the centering frame, the magnet is connected to the centering frame and contacts the bottom wall of the shell, the cone at the top of the upper central axis of the float is inserted into the exhaust hole of the upper cover, and the float remains upright under the constraint of the exhaust hole of the upper cover and the centering frame, and can move up and down with the change of oil level.

[0010] In the above scheme, the emission electric controller includes a box body, a solenoid valve and an intermediate relay arranged in the box body. The air inlet end of the solenoid valve is connected to the gas discharge port of the automatic gas discharger. The gas alarm signal on the gas relay is connected to the starting coil control circuit of the intermediate relay, and the normally open reed switch signal is connected to the power supply circuit of the intermediate relay and the solenoid valve.

[0011] In the above scheme, the air inlet end of the solenoid valve is connected to the gas discharge port of the automatic gas discharger through the air inlet three-way connecting pipe, and the air outlet end of the solenoid valve is connected to the air inlet end of the real-time gas sample retainer through the air outlet three-way connecting pipe.

[0012] In the above solution, a bypass valve is also installed on the pipeline connecting the air inlet three-way connecting pipe and the air outlet three-way connecting pipe.

[0013] In the above scheme, the real-time gas sample retainer includes a box body, an exhaust display arranged in the box body, a gas sample retention bottle, an elastic clamping mechanism and an oil seal box. The air inlet of the exhaust display is connected to the air outlet end of the solenoid valve in the discharge electric controller, the oil output end of the exhaust display is connected to the oil cup through the oil drain valve, the air outlet of the exhaust display is connected to the gas inlet of the gas sample retention bottle through the exhaust valve, and the gas sample retention bottle is clamped in the box body through the elastic clamping mechanism.

[0014] In the above scheme, the elastic clamping mechanism includes a hollow connecting rod, a clamping disk and a spring. The upper end of the hollow connecting rod is clamped with a piston seat installed on the gas sample retention bottle. The hollow connecting rod is provided with a clamping disk, which is sealed with the piston seat. The lower end of the hollow connecting rod passes through a guide sleeve fixed on the box body of the real-time gas sample retainer and is connected to an oil seal box located outside the box body. The part of the hollow screw located between the clamping disk and the box body is sleeved with the spring, and the spring is in a compressed state and one end is in contact with the inner wall of the box body.

[0015] A transformer automatic exhaust method, the technical main points of which are as follows:

[0016] After the gas in the gas relay enters the gas discharger, the float sinks, the normally open reed switch is turned on, and the gas presence signal is constantly output to the intermediate relay;

[0017] If the gas relay sends an alarm signal to the discharge electric controller, the power between the intermediate relay and the solenoid valve is connected, the solenoid valve opens, and the gas from the gas discharger flows to the real-time gas sample retainer;

[0018] If the alarm signal of the gas relay is inconvenient to introduce into the discharge electric controller, a remote control button can be installed instead. Press the remote control button to connect the power between the intermediate relay and the solenoid valve, the solenoid valve opens, and the gas from the gas discharger flows to the real-time gas sample retainer.

[0019] In the above scheme, if the solenoid valve and the intermediate relay fail, the bypass valve is opened and the system switches to manual operation mode.

[0020] The beneficial effects of the present invention are as follows: the automatic exhaust and gas extraction device for transformers is connected in series with an electric discharge controller between the automatic gas discharger and the real-time gas sample retainer, and the discharge controller receives the alarm signal generated by the gas relay and the gas presence signal generated by the automatic gas discharger. While providing the transformer with an automatic exhaust and electronically controlled timed exhaust, it also provides a simple, convenient, accurate and time-independent transformer gas sampling method for laboratory personnel, which allows the sampler to avoid the moment when the exhaust and gas extraction coincide with the explosion time point of the potential transformer, thereby ensuring the safety of the operator. In addition, the combined use of the gas presence signal and the gas alarm signal can accurately reflect the relationship between the time when the transformer generates gas, the accumulation speed and the operating status of the transformer, and can also be used as a signal source for sound prompts, information record preservation, computer monitoring and Internet of Things online, providing a basis for subsequent processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the structure of the automatic exhaust and air intake device for a transformer in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the automatic gas discharger in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the connection between the solenoid valve and the wiring terminal in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the gas sample retaining bottle and the exhaust push rod in the embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the intermediate relay and solenoid valve circuit in an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of a remote control button and an intermediate relay circuit in an embodiment of the present invention;

[0028] The numbers in the figure are as follows: 1 cylinder, 2 rubber ring, 3 upper cover, 4 centering sleeve, 5 rubber pad, 6 float, 6-1 cone, 7 centering frame, 8 magnet, 9 hollow bolt, 10 normally open reed switch, 11 terminal box, 12 solenoid valve, 13 outlet three-way connecting pipe, 14 bypass valve, 15 inlet three-way connecting pipe, 16 box body, 17 intermediate relay, 18 terminal, 19 signal output terminal, 20 relay signal input terminal, 21 emitter signal input terminal, 22 power inlet terminal, 23 upper joint, 24 lower joint, 25 exhaust display, 26 exhaust valve, 27 oil drain valve, 28 gas sample retention bottle, 29 oil cup, 30 box body, 31 elastic clamping mechanism, 31-1 clamping plate, 31-2 hollow connecting rod, 31-3 spring, 32 upper conduit, 33 intermediate conduit, 34 oil seal box, 35 round nut, 36 hand tightening screw, 37 sealing cap, 38 exhaust push rod, 39 sealing gasket. DETAILED DESCRIPTION

[0029] To make the above-mentioned objects, features and advantages of the present invention more obvious, the following is a brief description of the present invention in conjunction with the attached Figure 1 to Figure 6 The present invention is further described in detail with specific implementation modes.

[0030] The transformer automatic exhaust and gas extraction device used in this embodiment is a comprehensive device applied to oil-immersed transformers that can automatically (or electrically) control the exhaust gas, automatically output the gas presence signal, automatically retain the gas sample and obtain the gas sample. It consists of three parts: a gas automatic exhauster, an exhaust electric controller and a real-time gas sample retainer. The gas automatic exhauster is installed on the gas guide box interface of the gas relay, which can automatically exhaust the gas and control the exhaust. When the gas is generated, it can output the gas presence signal at any time. Combined with the relay gas alarm signal, it can record and calculate the time of gas generation, the accumulation speed and volume, etc., and easily analyze the corresponding relationship between the generation and change of the gas and the operating state of the transformer; the control circuit of the exhaust electric controller introduces the relay gas alarm signal and the exhauster gas presence signal respectively, and controls the opening and closing of the solenoid valve through the intermediate relay to complete the timed exhaust of the gas; the real-time gas sample retainer can receive the exhausted gas at any time or at a fixed time, retain the instant gas sample, and provide people with real-time gas sampling. Embodiment 1:

[0031] The automatic gas discharger in this embodiment includes an upper cover 3 with a gas discharge port, a cylinder 1, a float 6, a normally open magnetic reed switch 10 and a hollow bolt 9, wherein the upper cover 3 is buckled on the opening of the cylinder 1, and the upper cover 3 and the cylinder 1 are sealed by a rubber ring 2. The float 6 is connected to the centering frame 7, one end of the centering frame 7 passes through the top of the float 6 and is connected to the cone 6-1, and the centering frame 7 is limited by the centering sleeve 4 set in the gas discharge port to ensure that the cone 6-1 can enter and exit along the gas discharge port. The cone 6-1 can seal the gas discharge port of the upper cover 3 during the process of rising with the float 6 to prevent the transformer oil from being discharged. In this embodiment, a rubber pad 5 and a sealing pad 39 are also provided at the side connection between the upper cover 3 and the positioning sleeve 4 to seal the connection between the upper cover 3 and the positioning sleeve 5. One end of the centering frame 7 passing through the bottom of the float 6 is connected to the magnet 8. The normally open reed switch 10 is installed in the terminal box 11 located at the bottom of the cylinder 1. The magnet 8 and the normally open reed switch 10 are used together. When gas is generated, the normally open reed switch 10 is attracted to the magnet to generate a gas presence signal, which can realize gas monitoring. A hollow bolt 9 connected to the gas guide box interface of the gas relay is also provided on the cylinder 1.

[0032] The automatic gas discharger in this embodiment can be directly used with the QJ series ∮50mm and ∮80mm gas relays made in China. However, due to the deviation between the position of the gas guide box interface and the left corner screw hole of each manufacturer, when the automatic gas discharger and the gas relay cannot be assembled smoothly, the ∮11 hole can be trimmed and assembled with a round file and other tools, and the interface installation with the foreign ∮50mm and ∮80mm gas relays can be improved. Taking the domestic gas relay as an example, when installing, unscrew the left corner bolt of the gas relay cover, first connect the automatic gas discharger and the gas relay with a hollow bolt 9; take an M8×25 hexagonal bolt with a flat washer to fix it; and finally fix the hollow bolt 9. When gas accumulates in the gas relay, it can enter the gas discharger through the hollow bolt 9, forcing the oil level and the float 6 to drop. The magnet 8 at the bottom of the float 6 will attract the normally open reed switch 10 and output a gas presence signal.

[0033] The discharge electric controller in this embodiment includes a box 16, a solenoid valve 12 and an intermediate relay 17 arranged in the box 16, wherein the model of the intermediate relay is RJ25-CL-AC220V 5A; the model of the solenoid valve is DF2-B AC220V 0~0.8MPa. The air inlet end of the solenoid valve 12 is connected to the gas discharge port of the automatic gas discharger through the air inlet three-way connecting pipe 15, and the air outlet end of the solenoid valve 12 is connected to the air inlet end of the gas sample retainer through the air outlet three-way connecting pipe 13. A bypass valve 14 is also installed on the pipeline connecting the air inlet three-way connecting pipe 15 and the air outlet three-way connecting pipe 13. When the controller fails or other exhaust and air extraction methods are selected, the bypass valve should be opened to realize the conversion of the gas discharge mode. In other cases, the bypass valve 14 should be ensured to be always in a closed state. The automatic gas discharger is connected to the air inlet three-way connecting pipe 15 of the discharge electric control through an upper conduit 32 with an upper joint 23.

[0034] The gas alarm signal on the gas relay is connected to the start coil control circuit of the intermediate relay 17, and the signal of the normally open reed switch 10 is connected to the power supply circuit of the intermediate relay 17 and the solenoid valve 12. The specific wiring method is: the power supply 220V is connected to the power supply inlet terminal 22 of the terminal 18 (i.e., points 5 and 6 of the terminal 18), the gas signal X2 output terminal of the gas automatic discharger is connected to the discharger signal input terminal 21 of the terminal 18 (i.e., points 3 and 4 of the terminal 18) through a wire, and the gas signal (or remote control button) X1 output terminal of the gas relay is connected to the relay signal input terminal 20 of the terminal 18 (i.e., points 1 and 2 of the terminal 18) through a wire. The signal output terminal 19 of the terminal 18 is connected to the signal input terminal of the solenoid valve 12, and the intermediate relay 17 receives the alarm signal generated by the gas relay and the gas presence signal generated by the gas automatic discharger, and controls the on and off of the solenoid valve 12 according to the above two signals, so as to realize the automatic discharge of gas from the gas automatic discharger to the real-time gas sample retainer.

[0035] like Figure 5 As shown, when there is gas in the automatic gas discharger, the normally open reed switch X1 is turned on; when the gas in the gas relay accumulates 250ml, the reed switch X2 of the gas relay is turned on, the intermediate relays J1 and J2 are energized, the solenoid valve F is opened, and the gas is discharged. When the gas is automatically discharged, the reed switch X2 of the gas relay will be disconnected in advance after the gas accumulation in the gas relay is less than 250ml, but the solenoid valve F is still open; when the gas is discharged, the normally open reed switch X1 in the automatic gas discharger is disconnected, the gas presence signal is disconnected, the solenoid valve F is closed, and the exhaust stops.

[0036] The real-time gas sample retainer of this embodiment includes a box body 30, an exhaust indicator 25 disposed in the box body 30, a gas sample retaining bottle 28, an elastic clamping mechanism 31 and an oil cup 29. The air inlet of the exhaust indicator 25 is connected to the gas outlet end of the solenoid valve 12 in the discharge electric controller through an intermediate conduit 33, the oil output end of the exhaust indicator 25 is connected to the oil cup 29 through an oil drain valve 27, and the gas outlet of the exhaust indicator 25 is connected to the gas inlet of the gas sample retaining bottle 28 through an exhaust valve 26. The lower end of the gas sample retaining bottle 28 is fixed in the box body 30 through an elastic clamping mechanism 31. The elastic clamping mechanism 31 in this embodiment can realize the clamping and disassembly of the gas sample retention bottle 28, and specifically includes a hollow connecting rod 31-2, a clamping plate 31-1 and a spring 31-3. A piston is installed in the gas sample retention bottle 28, and the hollow connecting rod 31-2 is threadedly connected to the piston seat (the upper end of the hollow connecting rod 31-2 is provided with an external thread, and the piston seat is provided with an internal thread that matches the external thread of the hollow connecting rod 31-2). The clamping plate 31-1 on the hollow connecting rod 31-2 is sealed and connected to the end face of the piston seat through a sealing ring. The lower end of the hollow connecting rod 31-2 passes through the guide sleeve cover fixed on the box body 30 and is connected to the oil seal box 34 located outside the box body 30. The part of the hollow connecting rod 31-2 located between the clamping plate 31-1 and the box body 30 is sleeved with the spring 31-3. One end of the spring 31-3 contacts the inner wall of the box body 30. When the gas sample retention bottle 28 is fixed, the spring 30 is in a compressed state, and the gas sample retention bottle 28 is fixed under the action of the spring force.

[0037] When fixing, first pull the piston of the gas sample retention bottle 28 to the 50ml scale position, and then thread the round nut 35 and the outer thread of the piston seat to fix the piston. The gas nozzle on the upper part of the gas sample retention bottle 28 is inserted into the interface of the exhaust valve 26, and the lower part of the gas sample retention bottle 28 is aligned with the clamping plate 31-1 of the elastic clamping mechanism 31, sealed and fixed.

[0038] When taking gas samples, loosen the hand-tightening screw 36, pull the oil seal box 34 downward, disengage the clamping plate 31-1 on the elastic clamping mechanism 31 from the gas sample retention bottle 28, and pull it out from the exhaust valve 26 interface, put the sealing cap 37 on the gas nozzle, and fix the exhaust push rod 38 on the right side wall of the box body when not in use. After taking gas samples, screw the exhaust push rod 38 on the M6 ​​thread hole on the outside of the piston to prevent gas samples from leaking. After the gas sample retention bottle 28 is brought back to the laboratory, first unscrew the round nut 35, and slowly push the exhaust push rod 38, and the gas sample can be discharged.

[0039] Before operation, add oil to the exhaust indicator 25 and the oil seal box 34. Unscrew the oil filling hole screw, fill the exhaust indicator 25 with transformer oil to the oil level line, and open the drain valve 27 to discharge the excess oil to display the exhaust situation. Unscrew the oil seal box 34 and fill the transformer oil to the overflow hole, then screw it on the hollow connecting rod 31-2 of the elastic clamping mechanism 31, and wipe the spilled oil. Ensure that the oil level is always above the exhaust hole of the hollow connecting rod 31-2 to seal the gas sample in the gas sample retention bottle 28.

[0040] Here’s how it works:

[0041] The transformer oil enters the automatic gas discharger, and the float 6 floats up to seal the gas discharge port to prevent the transformer oil from being discharged.

[0042] When gas accumulates in the gas relay, it will enter the gas automatic discharger through the hollow bolt 9, forcing the oil level and the float 6 to drop. The magnet 8 under the float 6 will attract the normally open reed switch 10 and output a gas presence signal.

[0043] When the gas in the gas relay gathers 250ml and sends out an alarm signal, the power supply between the intermediate relay 17 and the electromagnetic valve is automatically connected, the electromagnetic valve 12 opens, and the gas from the automatic gas discharger flows to the real-time sampling retainer.

[0044] When the gas in the gas relay is completely discharged and the automatic gas discharger is filled with oil, the float 6 floats up, the gas discharge port in the automatic gas discharger is sealed by the top cone 6-1 of the float 6, and the transformer oil is blocked in the automatic gas discharger.

[0045] When the gas exhaust port is sealed by the float 6, the solenoid valve 12 is also closed to prevent the gas from being discharged to the outside.

[0046] The discharged gas first enters the exhaust indicator 25 of the real-time gas sample retainer. When the gas flows from the oil to the high point exhaust hole, bubbles will appear in the oil.

[0047] The gas sample enters the gas sample retaining bottle 28 through the exhaust valve 26, and 50 ml of gas sample will remain at all times.

[0048] In this embodiment, different combinations of the automatic exhauster, the exhaust electric controller and the real-time gas sample retainer enable the transformer automatic exhaust and gas extraction device to have five different functions.

[0049] (1) Combination of automatic gas discharger, normally open reed switch and real-time gas sample retainer: realize automatic gas discharge, gas presence signal output and real-time gas sample retention.

[0050] (2) Combination of automatic gas discharger and real-time gas sample retainer: realize automatic gas discharge and real-time gas sample retention.

[0051] (3) Automatic gas discharger with normally open reed switch, discharge electric controller, gas introduction alarm signal, and real-time gas sample retainer: realize gas presence signal output, gas electronically controlled automatic discharge, and real-time gas sample retention.

[0052] (4) Automatic gas discharger with normally open reed switch, discharge electric controller (with remote control button), and real-time gas sample retainer: realize gas presence signal output, manual remote electric control of gas discharge, and real-time gas sample retention.

[0053] (5) The above four combinations can all achieve manual on-site exhaust and gas extraction with the help of the gas alarm prompt of the gas relay when the exhaust valve is closed. However, the valve on the exhaust electric controller must be in the open state and the solenoid valve must be in the off-control state.

[0054] When selecting automatic exhaust, electronically controlled automatic exhaust, manual remote electronically controlled exhaust, and retaining the real-time gas sample (or instant gas sample), the oil drain valve should be in the closed state and the exhaust valve should be in the open state.

[0055] When choosing artificial exhaust and air sampling, both the oil drain valve and the air exhaust valve should be in the closed state. Embodiment 2:

[0056] The difference between this embodiment and embodiment 1 is that if the alarm signal of the gas relay cannot be obtained, manual remote control can be achieved by setting a remote control button. Figure 6 shown.

[0057] like Figure 6 As shown, when there is gas in the automatic gas discharger, the normally open reed switch X1 is turned on; when the gas relay alarms, press the remote control button, the intermediate relays J1 and J2 will be attracted, and the solenoid valve F will open; if the button K is released at this time, the solenoid valve F will still remain in the open state; when the gas is discharged, the normally open reed switch X1 in the automatic gas discharger is disconnected, the gas presence signal is disconnected, and the solenoid valve F is closed to stop exhausting.

[0058] Here’s how it works:

[0059] The transformer oil enters the automatic gas discharger, and the float 6 floats up to seal the gas discharge port to prevent the transformer oil from being discharged.

[0060] When gas accumulates in the gas relay, it will enter the gas automatic discharger through the hollow bolt 9, forcing the oil level and the float 6 to drop. The magnet 8 under the float 6 will attract the normally open reed switch 10 and output a gas presence signal.

[0061] When the gas in the gas relay accumulates 250ml and sends out an alarm signal, the remote control button is manually pressed to connect the power supply between the intermediate relay 17 and the solenoid valve 12, the solenoid valve 12 opens, and the gas from the automatic gas discharger flows to the real-time sampling retainer.

[0062] When the gas in the gas relay is completely discharged and the automatic gas discharger is filled with oil, the float 6 floats up, the gas discharge port in the automatic gas discharger is sealed by the top cone 6-1 of the float 6, and the transformer oil is blocked in the automatic gas discharger.

[0063] When the gas exhaust port is sealed by the float 6, the solenoid valve 12 is also closed to prevent the gas from being discharged to the outside.

[0064] The discharged gas first enters the exhaust indicator 25 of the real-time gas sample retainer. When the gas flows from the oil to the high point exhaust hole, bubbles will appear in the oil.

[0065] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A transformer automatic exhaust and air extraction device, characterized in that: It includes an automatic gas discharger, an electric discharge controller and a real-time gas sample retainer; The gas inlet end of the automatic gas discharger is connected to the gas guide box interface of the gas relay in the transformer, and is used to receive the gas from the gas relay; The air inlet end of the discharge electric controller is connected to the gas discharge port of the automatic gas discharger, and is used to receive the alarm signal generated by the gas relay and the gas presence signal generated by the automatic gas discharger, and control the discharge of gas from the automatic gas discharger to the real-time gas sample retainer according to the above two signals; The inlet end of the gas sample retainer is connected to the outlet end of the discharge electric controller for receiving the discharged gas from time to time or at a fixed time to retain the immediate gas sample; The automatic gas discharger comprises an upper cover with a gas discharge port, a cylinder, a float, a normally open magnetic reed switch and a hollow bolt. The upper cover is buckled on the opening of the cylinder to form a sealed assembly of the outer shell. The upper end of the float is provided with a cone for sealing the gas discharge port of the upper cover, and the lower end of the float is provided with a magnet used in conjunction with the normally open magnetic reed switch. The cylinder is also provided with a hollow bolt connected to the gas guide box interface of the gas relay. The float is a thin-walled hollow vacuum assembly part. The top of the central axis is inserted into the lower part of the exhaust hole of the upper cover. The top cone is kept at a certain distance from the discharge port rubber pad. The lower part of the central axis passes through the centering frame. A magnet is installed at the end. The centering frame is inserted into the cylindrical groove at the bottom of the cylinder body by interference fit, so that the float remains in an upright state. Under the constraint of the exhaust hole of the upper cover and the centering frame, it can move up and down with the change of oil level. The upper limit of movement is when the cone of the upper half of the central axis tops the exhaust port sealing pad, and the lower limit of movement is when the magnet on the lower half of the central axis contacts the bottom wall of the cylinder. When the float rises, the cone and the exhaust rubber pad form an effective seal. When the float descends, the magnet contacts the bottom wall of the cylinder body, and the minimum effective suction distance is maintained with the lower reed switch. The emission electric controller includes a box body, a solenoid valve and an intermediate relay arranged in the box body. The air inlet end of the solenoid valve is connected to the gas discharge port of the automatic gas discharger. The gas alarm signal on the gas relay is connected to the starting coil control circuit of the intermediate relay. The normally open reed switch signal is connected to the power supply circuit of the intermediate relay and the solenoid valve.

2. The automatic exhaust and air extraction device for transformer according to claim 1, characterized in that: The air inlet end of the solenoid valve is connected to the gas discharge port of the automatic gas discharger through the air inlet three-way connecting pipe, and the air outlet end of the solenoid valve is connected to the air inlet end of the real-time gas sample retainer through the air outlet three-way connecting pipe.

3. The automatic exhaust and air extraction device for transformer according to claim 2, characterized in that: A bypass valve is also installed on the pipeline connecting the air inlet three-way connecting pipe and the air outlet three-way connecting pipe.

4. The automatic exhaust and air extraction device for transformer according to claim 1, characterized in that: The real-time gas sample retainer includes a box body, an exhaust display arranged in the box body, a gas sample retention bottle, an elastic clamping mechanism and an oil seal box. The air inlet of the exhaust display is connected to the air outlet end of the solenoid valve in the discharge electric controller, the oil output end of the exhaust display is connected to the oil cup through the oil drain valve, the air outlet of the exhaust display is connected to the gas inlet of the gas sample retention bottle through the exhaust valve, and the gas sample retention bottle is installed in the box body through the elastic clamping mechanism.

5. The automatic exhaust and air extraction device for transformer according to claim 4, characterized in that: The elastic clamping mechanism comprises a hollow connecting rod, a clamping disc, a spring and an oil seal box connected to the hollow connecting rod. The upper end of the hollow connecting rod is connected to a piston seat installed on the gas sample retention bottle. The hollow connecting rod is provided with a clamping disc. The clamping disc protrudes a round boss with a sealing rubber ring inserted into the screw hole of the piston seat to form a radial fixation of the real-time gas sample retainer. The two end faces are sealed with rubber rings. The lower end of the hollow connecting rod passes through a guide sleeve cover fixed on the box body of the real-time gas sample retainer and is connected to the oil seal box located outside the box body. The part of the hollow connecting rod located between the clamping disc and the box body is sleeved with a spring. The spring is in a compressed state and the lower end contacts the inner wall of the box body. The upper end bounces the connecting disc to form an axial fixation of the real-time gas sample retainer.

6. A transformer automatic exhaust method, implemented by using the transformer automatic exhaust and air extraction device according to claim 1, characterized in that: The following steps are involved: After the gas in the gas relay enters the gas discharger, the float sinks, the normally open reed switch is turned on, and the gas presence signal is constantly output to the intermediate relay; If the gas relay sends an alarm signal to the discharge electric controller, the power between the intermediate relay and the solenoid valve is connected, the solenoid valve opens, and the gas from the gas discharger flows to the real-time gas sample retainer; If the gas relay sends out an alarm signal which is inconvenient to introduce the discharge electric controller, a remote control button can be installed instead. After receiving the gas alarm, manually pressing the remote control button can also connect the power supply between the intermediate relay and the solenoid valve, open the solenoid valve, and the gas from the gas discharger flows to the real-time gas sample retainer.

7. The automatic exhaust method for transformer according to claim 6, characterized in that: If the solenoid valve and the intermediate relay fail, the bypass valve will be opened and the system will switch to manual operation mode.

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