Transformer automatic exhaust sampler and air sampling method

Abstract

A transformer automatic exhaust sampler relates to the field of oil-immersed transformers. The oil-gas diverter in the device is connected to the gas relay through an exhaust pipe, and the imported oil and gas are led out from different paths. The gas discharge is achieved by controlling the oil discharge. The oil discharge and stop are achieved by the gas alarm signal (or control button) of the gas relay and the normally closed magnetic reed switch triggering the intermediate relay to control the opening and closing of the solenoid valve. In the exhaust path, a gas sample retention bottle is floatingly connected between the angle exhaust valve and the oil seal clamping mechanism to achieve the through-type gas discharge and the last 100ml gas sample retention. The device is suitable for oil-immersed transformers, and is more suitable for ultra-high voltage transformers, intelligent transformers and unmanned station transformers. It has the characteristics of long gas transmission distance, no residual discharge, no power outage when collecting gas samples outside the restricted area, high purity of stored gas samples, and automatic exhaust and retention of gas samples without human intervention.

Description

Technical Field

[0001] The invention relates to the field of oil-immersed transformers, and in particular to an automatic exhaust sampler for transformers and an exhaust method. Background Art

[0002] In view of the particularity of gas emission from high to low, the gas in the gas relay must be guided and discharged in the pipe with the help of the pressure of the oil flowing outward. The inner diameter of the conduit cannot exceed the diameter of the molecular clusters formed by the surface tension of the oil. If the inner diameter of the conduit is too large, the gas will rise along the pipe wall and return to the gas relay, resulting in incomplete gas emission. Each exhaust will result in a transformer oil loss equal to the volume of the inner diameter of the pipe. The farther the gas is guided and transported, the more transformer oil is lost. Taking a 2mm inner diameter pipe as an example, about 31.4ml of transformer oil is lost for every 10m of conduit, but the lost transformer oil can be compensated by normal oil replenishment. The existing transformer gas emission is carried out by traditional gas guide boxes or gas collecting boxes. When exhausting, the transformer needs to be stopped and completed with the help of manual operation. The operation method is complicated and the operation time is long, and the amorphous gas extraction device cannot complete the extraction of gas samples. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention aims to provide a transformer automatic exhaust sampler and an exhaust method.

[0004] The technical solution adopted by the invention is: a transformer automatic exhaust sampler, including a gas sample retention bottle, an oil seal clamping mechanism, an oil cup, a solenoid valve and a control system. The technical key points are that it also includes an oil-gas separator, a straight-through oil drain valve and an angle-through exhaust valve. The gas relay is connected to the oil-gas separator by an air guide pipe. The angle-through exhaust valve on the oil-gas separator and the oil seal clamping mechanism are floatingly connected to the gas sample retention bottle. The oil seal clamping mechanism provides an upward thrust for the gas sample retention bottle so that the air inlet end of the gas sample retention bottle is connected to the oil-gas separator through the angle-through exhaust valve; one oil drain port of the oil-gas separator is connected to the oil cup by a straight-through oil drain valve, and the other oil drain port of the oil-gas separator is connected to a 90-degree hose connector and an oil drain pipeline through a solenoid valve. The control system is connected to the solenoid valve, the normally closed reed switch and the oil-gas separator.

[0005] In the above scheme, the oil-gas divider includes a divider shell with an exhaust channel and an exhaust port, a centering sliding sleeve, a float, a switch box body and a normally closed reed switch. The exhaust channel on the divider shell is connected with the exhaust port and is connected with the outside world through the exhaust port. A float is provided in the hollow inner cavity of the divider shell. The top of the float is sleeved in the centering sliding sleeve. The centering sliding sleeve is fixed by screwing with the inner thread of the center hole of the divider shell using an external thread. The float moves up and down along the centering sliding sleeve to seal or open the exhaust port. The bottom of the float is connected to a magnetic steel block. A switch box body is provided at the bottom of the divider shell. A circular guide groove is prefabricated outside the switch box body. The guide groove is used to limit the circular guide column arranged at the bottom of the float. A normally closed reed switch used in conjunction with the magnetic steel block is installed in the switch box body.

[0006] In the above scheme, the float includes a sealing mandrel and a hollow cylindrical sphere. The upper end of the sealing mandrel is connected to a tip for sealing the exhaust port of the diverter housing. The lower end of the sealing mandrel is embedded in the mounting hole on the upper surface of the hollow cylindrical sphere. The outer peripheral surface of the sealing mandrel is provided with a plurality of axial grooves for ventilation.

[0007] In the above scheme, a sealing rubber ring is provided at the connection between the centering sliding pressing sleeve and the diverter housing.

[0008] In the above solution, a sealing rubber ring is provided at the connection between the switch box body and the diverter housing.

[0009] In the above scheme, the oil seal clamping mechanism includes an oil seal box, an oil seal box cover with an oil filling port and an air nozzle, a sliding sleeve, a spring and a spring seat. The oil seal box cover is interference-fitted at the opening on the upper surface of the oil seal box, one end of the air nozzle extends out of the oil seal box cover, and a first air pipe is welded to the other end of the air nozzle, and the first air pipe is inserted under the sealing oil. The oil seal box includes an oil storage cavity and an extension pipe isolated from each other. A second air pipe for exhaust is embedded and cast at a position offset from the center of the bottom of the oil seal box. The outlet end of the second air pipe passes through the bottom wall of the oil storage cavity and enters the top of the extension pipe, and the second air pipe is connected to the extension pipe. The pipe port is connected to a hose direct connector and an exhaust hose, and the exhaust hose is used to guide the gas in the oil storage chamber guided by the second air pipe out of the oil seal box and prevent external gas from entering the gas sample retention bottle; the outer wall of the extension tube of the oil seal box is sleeved with a spring, and the spring is pressed between the bottom of the oil seal box and the spring seat at the bottom of the sliding sleeve frame, and the outer thread of the spring seat is screwed into the inner screw hole of the sliding sleeve frame through the lower side wall of the box body and is fixed to the box body, the extension tube of the oil seal box is connected to the hose direct connector and the exhaust hose, and the sliding sleeve frame is sleeved on the outer wall of the oil seal box, and the oil seal box moves up and down along the sliding sleeve frame under the action of the spring pressure.

[0010] The above scheme also includes an upper self-sealing valve arranged on the top of the bottle body and a lower self-sealing valve arranged on the piston at the bottom of the bottle body, the upper self-sealing valve includes an upper sliding rod, an upper valve seat and a spring, the head of the upper sliding rod extends into the bottle body and can seal the upper opening of the bottle body, the upper sliding rod outer shell is connected with an upper valve seat, the upper valve seat is fixedly connected to the bottle body, the tail of the upper sliding rod is connected to a three-sided groove nut, and a spring is also sleeved on the outside of the upper sliding rod, and the spring is pressed between the three-sided groove nut and the upper valve seat; the lower self-sealing valve includes a lower valve seat, a lower sliding rod, a piston, a spring, a nut, a handle and a three-sided groove nut, the piston is fixed at the lower opening of the bottle body cavity, the lower valve body is assembled with a screw hole in the piston, the lower sliding rod is assembled in the lower valve body, the spring is sleeved on the lower sliding rod, the spring is pressed between the piston and the lower three-sided groove nut, the lower three-sided groove nut is fixedly connected to the bottom of the lower sliding rod, the handle-type plugging cover is screwed on the bottle body, and the outer thread of the lower valve seat is screwed into the nut through the handle-type plugging cover for connection.

[0011] A gas sampling method for a transformer automatic exhaust sampler, the technical main points of which are as follows:

[0012] When there is no gas in the transformer or the gas is exhausted, the oil-gas separator is filled with transformer oil, the float floats up, and the top seals the exhaust port to prevent the transformer oil from being discharged from the exhaust port. At this time, the magnetic steel block at the bottom of the float is away from the normally closed reed switch, making it in a normally closed state, and the power circuit is connected; when the gas relay sends out a gas alarm signal, it triggers the intermediate relay to energize, and the solenoid valve opens to discharge the transformer oil in the oil-gas separator. When the residual oil in the pipe is drained, the gas enters the oil-gas separator and the oil level drops. When the oil level drops to the point where the magnetic steel block is close to the normally closed reed switch, the moving piece and the static piece of the reed switch are separated, the power circuit is cut off, and the solenoid valve is closed. At this time, the gas from the gas relay is guided by the transformer oil and discharged into the oil-gas separator, and enters the gas sample retention bottle through the gas channel of the angle exhaust valve.

[0013] The beneficial effects of the present invention are as follows: the automatic exhaust sampler for transformer, the gas relay is connected to the oil-gas separator by an air guide pipe, the angle exhaust valve connected to the oil-gas separator is connected to the gas sample retention bottle by a floating connection with the oil seal clamping mechanism, the device uses the oil-gas separator to guide the oil and gas from different paths, the gas discharge is achieved by controlling the oil discharge, the oil discharge and stop are achieved by the gas alarm signal (or control button) of the gas relay and the normally closed magnetic reed switch triggering the intermediate relay to control the opening and closing of the electromagnetic valve. In addition, the upper self-sealing valve and the lower self-sealing valve are respectively connected to the air inlet and outlet ends of the gas sample retention bottle to achieve gas exhaust and gas sample retention, and the gas sample is automatically sealed in the bottle body after the gas sample retention bottle is removed, which can be used for testing and analysis in time, or can be stored for a long time, and multiple gas samples can be centrally tested and analyzed. The device is installed outside the high-voltage restricted area, so that gas samples can be collected while the transformer is running. It is suitable for oil-immersed transformers, and is more suitable for ultra-high voltage and ultra-high voltage transformers, intelligent transformers and unmanned station transformers. It has the characteristics of long gas transmission distance, no residue in emissions, high purity of stored gas samples, automatic exhaust and retention of gas samples, safe and stable operation, and no human intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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.

[0015] Figure 1 Schematic diagram of the overall structure of the automatic exhaust sampler for transformers in an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of the oil and gas diverter in an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of the oil seal clamping mechanism in an embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of the structure of a gas sample retention bottle in an embodiment of the present invention;

[0019] Figure 5 This is a wiring diagram of a control system in an embodiment of the present invention;

[0020] Figure 6 This is a circuit diagram of electric automatic control exhaust in an embodiment of the present invention;

[0021] Figure 7 This is a circuit diagram of an electric remote button controlling exhaust in an embodiment of the present invention;

[0022] The serial numbers in the figure are as follows: 1 air guide pipe, 2 upper joint, 3 oil and gas distributor, 31 distributor shell, 32 exhaust port, 33 sealing rubber ring, 34 centering sliding sleeve, 35 exhaust channel, 36 float, 361 sealing spindle, 362 hollow cylindrical sphere, 363 magnetic steel block, 37 sealing rubber ring, 38 normally closed magnetic reed switch, 39 switch box body, 4 right joint, 5 angle exhaust valve, 6 gas sample retention bottle, 61 bottle body, 62 upper self-sealing valve, 62-1 three-sided groove nut, 62-2 spring, 62-3 sealing rubber ring, 62-4 upper valve seat, 62-5 upper sliding rod, 62-6 sealing rubber ring, 63 lower self-sealing valve, 63-1 rubber ring, 63-2 lower sliding rod, 63-3 piston, 63-4 spring, 63-5 piston rubber ring, 63-6 Handle-type plugging cover, 63-7 rubber ring, 63-8 nut, 63-9 lower valve seat, 63-10 lower three-sided groove nut, 7 oil seal clamping mechanism, 7-1 oil seal box cover, 7-2 sealing rubber ring, 7-3 air nozzle, 7-4 oil filling hole, 7-5 first air pipe, 7-6 oil storage chamber, 7-7 spring, 7-8 sliding sleeve, 7-9 pipe thread, 7-10 hose straight joint, 7-11 exhaust hose, 7-13 extension pipe, 7-14 second air pipe, 7-15 spring seat, 8 straight-through oil drain valve, 9 lower joint, 10 solenoid valve, 11 left joint, 12 control system, 13 oil cup. DETAILED DESCRIPTION

[0023] 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 7 The present invention is further described in detail with reference to the accompanying drawings and specific embodiments.

[0024] The transformer automatic exhaust sampler used in this embodiment includes a gas sample retaining bottle 6, an oil seal clamping mechanism 7, an oil cup 13, a solenoid valve 10, a control system 12, an oil and gas divider 3, a straight-through oil drain valve 8 and an angle-through exhaust valve 5. The gas relay is connected to the oil and gas divider 3 by an air guide pipe 1, and an upper joint 2 is installed at the connection between the air guide pipe 1 and the oil and gas divider 3. The gas sample retaining bottle 6 is floatingly connected between the oil and gas divider 3 and the oil seal clamping mechanism 7. After the gas sample retaining bottle 6 is connected, the oil seal clamping mechanism 7 is connected to the gas inlet end of the gas sample retaining bottle 6 by the right joint 4 and the angle-through exhaust valve 5, and the oil seal clamping mechanism 7 is connected to the gas outlet end of the gas sample retaining bottle 6. One oil drain port of the oil-gas diverter 3 is connected to the oil cup 13 by means of a straight-through oil drain valve 8 and a lower joint 9, and the other oil drain port of the oil-gas diverter 3 is connected to the oil drain pipeline through a left joint 11 and a solenoid valve 10. The control system 12 is connected to the solenoid valve 10, the normally closed reed switch and the oil-gas diverter 3.

[0025] The oil-gas separator 3 in this embodiment is used to export oil and gas through different paths. The gas emission control is achieved by controlling the oil emission. The oil emission and stop are achieved by the gas alarm signal (or control button) of the gas relay and the normally closed reed switch triggering the intermediate relay to control the opening and closing of the solenoid valve. It includes a diverter housing 31, a centering sliding sleeve 34, a float 36, a switch box 39 and a long closed magnetic reed switch 38. The exhaust channel 35 on the diverter housing 31 is connected to the exhaust port 32 and is connected to the outside through the exhaust port 32. The hollow inner cavity of the diverter housing 31 is provided with a float 36. The top of the float 36 is sleeved in the centering sliding sleeve 34. A sealing rubber ring 33 is provided between the centering sliding sleeve 34 and the diverter housing 31. The centering sliding sleeve 34 is fixed by screwing with the inner thread of the center hole of the diverter housing 31 through an external thread. The float 36 moves up and down along the centering sliding sleeve 34 to seal or open the exhaust port 32. The bottom of the float 36 is connected to a magnetic steel block 363. A switch box 39 is provided at the bottom of the diverter housing 31, and a sealing rubber ring 37 is provided at the connection between the two. The switch box 39 is prefabricated with an annular guide groove, which cooperates with the guide column set at the bottom of the float 36, so that the float 36 moves up and down along the guide groove, playing the role of limiting the float 362. The switch box 39 is equipped with a normally closed reed switch 38 used in conjunction with the magnetic steel block 363.

[0026] The float 36 in this embodiment includes a sealing mandrel 361 and a hollow cylindrical sphere 362. The upper end of the sealing mandrel 361 is connected to a tip. After the float 36 floats upward under the action of buoyancy, the tip will seal the exhaust port 32 on the diverter housing 31 to prevent the oil from flowing out. The lower end of the sealing mandrel 361 is embedded in the mounting hole on the upper surface of the hollow cylindrical sphere 362. The outer peripheral surface of the sealing mandrel 361 is provided with a plurality of axial grooves for ventilation.

[0027] The working process of the oil-gas separator 3 in this embodiment is as follows: the gas relay is filled with transformer oil, the lower part of the oil-gas separator 3 is also filled with transformer oil, the float 36 in the oil-gas separator 3 floats up, and the exhaust port 32 is closed to prevent the transformer oil from being discharged, the normally closed reed switch 38 at the lower part of the oil-gas separator is in a disconnected state, and the intermediate relay power supply control circuit is connected.

[0028] When the gas accumulation in the gas relay is greater than 250 ml and a gas alarm is sounded, the coil start circuit of the intermediate relay is connected, the solenoid valve 10 is opened, and the transformer oil in the pipeline is discharged.

[0029] When the transformer oil in the pipe is completely discharged, the gas enters the oil-gas separator 3, and the float 36 drops to the bottom along with the oil level, the normally closed reed switch 38 is sucked open by the magnetic steel block 363 at the bottom of the float 36, the power circuit of the intermediate relay is cut off, and the solenoid valve 10 is closed to stop draining oil.

[0030] When the float 36 descends, the exhaust port 32 located at the upper part of the oil-gas separator 3 opens, and the gas is discharged through the angle exhaust valve 5, the gas sample retention bottle 6 and the oil seal clamping mechanism 7.

[0031] After the gas is discharged, the transformer oil re-enters the oil-gas separator 3, and the float 36 closes the exhaust port 32 as the oil level rises, the gas stops being discharged, and the transformer oil stops being replenished, but 100 ml of gas is sealed in the gas sample retention bottle 6.

[0032] The control system wiring terminals in this embodiment are as follows Figure 5 As shown. The wiring terminal is set in the box of the transformer automatic exhaust sampler, including six wiring terminals, among which terminal 1 and terminal 2 are used to connect to the 220V AC power supply. Terminals 3 and 4 are used to connect to the gas relay alarm signal X2 and / or the button K set at the remote. Terminals 5 and 6 are used to connect to the normally closed reed switch 38. The connection between the intermediate relay and the gas relay and the normally closed reed switch in this embodiment is as shown in FIG. Figure 6 The connection between the intermediate relay, button K and normally closed reed switch is shown in Figure 7 shown.

[0033] This embodiment uses different control signals connected to the intermediate relay to achieve different discharge processes:

[0034] a) The gas relay alarm signal X2 is connected to the terminal block 3-4 to realize automatic control of gas discharge. When used for intelligent transformers and unmanned station transformers, X2 signal control must be used;

[0035] b) If automatic control of discharge is abandoned, the button K can be connected to the 3-4 points of the terminal block to realize manual remote electric control of gas discharge. The button K and the X2 signal can also be installed and used at the same time;

[0036] c) The oil drain stop signal X1 from the normally closed reed switch 38 is connected to point 5-6 of the terminal block (connected internally);

[0037] d) 220V power supply connected to terminal block 1-2;

[0038] e) When the electronic control system fails, open the straight-through oil drain valve to achieve manual on-site exhaust and air collection. The oil drain valve can also be used to take oil samples.

[0039] The gas sample retention bottle 6 in this embodiment includes a bottle body 61, an upper self-sealing valve 62 arranged on the top of the bottle body 61, and a lower self-sealing valve 63 arranged at the bottom of the bottle body 61. The upper self-sealing valve 62 in this embodiment includes an upper sliding rod 62-5, an upper valve seat 62-4 and a spring 62-2. The head of the upper sliding rod 62-5 extends into the bottle body 61 and can seal the upper opening of the bottle body 61. In this embodiment, a sealing rubber ring 62-6 is arranged at the connection between the head of the sliding rod 62-5 and the bottle body 61. The upper sliding rod 62-5 is outer-mounted with an upper valve seat 62-4, and the upper valve seat 62-4 is fixedly connected to the bottle body 61. The tail of the upper sliding rod 62-5 is connected to a three-sided groove nut 62-1, and a spring 63-4 is also sleeved on the outer side of the upper sliding rod 62-5. The spring 63-4 is pressed between the three-sided groove nut 62-1 and the upper valve seat 62-4. A sealing rubber ring 62-3 is provided between the upper valve seat 62-4 and the bottle body 61. The lower self-sealing valve 63 in this embodiment includes a lower valve seat 63-9, a lower sliding rod 63-2, a piston 63-3, a spring 63-4, a nut 63-8, a handle plug cover 63-6 and a lower three-sided groove nut 63-10. The piston 63-3 is fixed at the lower opening of the inner cavity of the bottle body 61. The outer surface of the piston 63-3 is connected with a piston rubber ring 63-5. The piston rubber ring 63-5 can seal between the piston 63-3 and the bottle body 61 to ensure the sealing of the gas sample retention bottle 6. The lower valve body 63-9 is assembled in the inner threaded hole of the piston 63-3, and a rubber ring 63-7 is provided at the connection between the piston 63-3 and the lower valve body 63-9. The lower sliding rod 63-2 is assembled in the lower valve body 63-9, the top of the lower sliding rod 63-2 passes through the center hole of the lower valve seat 63-9, and its head can seal the center hole. A rubber ring 63-1 is arranged between the lower sliding rod 63-2 and the lower valve seat 63-9. The spring 63-4 is sleeved on the lower sliding rod 63-2, and the spring 63-4 is pressed between the piston 63-3 and the lower three-sided groove nut 63-10. The lower three-sided groove nut 63-10 is fixedly connected to the bottom of the lower sliding rod 63-2. The handle plug 63-6 is screwed on the bottle body 61 and connected to the lower valve seat 63-9 by the nut 63-8.

[0040] After the gas sample retention bottle in this embodiment is installed, the upper self-sealing valve 62 and the lower self-sealing valve 63 are in a compressed open state, and the gas can flow; when the gas sample retention bottle 6 is removed, the valve stems of the self-sealing valves at both ends pop out to seal the gas in the gas sample retention bottle 6. After the gas sample retention bottle 6 is removed, the gas sample discharge head and the exhaust push rod are installed to take out the gas sample, specifically:

[0041] a) When the gas is discharged and you want to take the gas sample away, pull the handle down 15 mm and turn it 30 degrees to the right (or left) to lock it;

[0042] b) Move the gas sample retention bottle 14 downward, disengage the upper joint from the angle exhaust valve interface, and then place it obliquely and remove it. After the gas sample retention bottle is removed, the upper and lower automatic sealing valves seal the gas sample in the bottle;

[0043] c) When using the gas sample, screw on the gas discharge head and exhaust push rod at the upper and lower self-sealing valves of the gas sample retention bottle, respectively, tighten the round nut to remove the thread from the screwing state, and push the exhaust push rod to discharge the gas sample;

[0044] d) The installation of the gas sample retention bottle is the opposite of the removal procedure, but the piston must be pulled to the plugging end of the gas bottle handle, and the locking nut must be tightened to secure it. The gas discharge head and exhaust push rod must be unscrewed before installation.

[0045] In this embodiment, the gas sample retaining bottle has two methods for storing gas samples:

[0046] a) The gas sample retention bottle sucks transformer oil and is installed on the sampler. The liquid is retained in the cavity by the siphon principle. As the gas enters, the liquid begins to flow out, so that the obtained gas sample has high purity;

[0047] b) The cavity of the gas sample retention bottle is installed on the sampler. After several exhausts, the purity of the gas sample can be close to accurate and can also be used as a gas sample, but the oil box of the oil seal mounting mechanism must be filled with sealing liquid.

[0048] The oil seal clamping mechanism 7 in this embodiment includes an oil seal box body, an oil seal box cover 7-1 with an oil filling port 7-4 and a gas nozzle 7-3, a sliding sleeve frame 7-8, a spring 7-7 and a spring seat 7-15. The oil seal box cover 7-1 is interference-fitted at the opening on the upper surface of the oil seal box, one end of the gas nozzle 7-3 extends out of the oil seal box cover 7-1, and a sealing rubber ring 7-2 is provided at the contact point between the two. When clamped with the gas sample retention bottle 6, the gas nozzle 7-3 will push open the head of the upper sliding rod 62-5 in the gas sample retention bottle 6, so that the gas in the gas sample retention bottle 6 enters the oil seal clamping mechanism 7. A first air pipe 7-5 is welded to the other end of the air nozzle 7-3, and the first air pipe 7-5 is inserted under the sealing oil. The oil seal box includes an oil storage chamber 7-6 and an extension tube 7-9 that are isolated from each other. A second air pipe 7-14 for exhaust is embedded in the oil seal box at a position 7 mm away from the center. The outlet end of the second air pipe 7-14 passes through the oil storage chamber 7-6 and enters the top of the extension tube 7-13, and the second air pipe 7-14 is connected to the extension tube 7-13. The bottom of the extension tube 7-13 is connected to a hose direct connector 7-10 and an exhaust hose 7-11. The exhaust hose 7-11 is used to guide the gas in the oil storage chamber 7-6 guided by the second air pipe 7-14 out of the oil seal box and prevent external gas from entering the gas sample retention bottle 6. The outer wall of the extension tube 7-13 at the bottom of the oil seal box is sleeved with a spring 7-7, and the spring 7-7 is crimped between the bottom of the extension tube 7-13 of the oil seal box and the spring seat 7-15 at the bottom of the oil seal box. The outer wall of the extension tube 7-13 at the bottom of the oil seal box is connected to the exhaust hose 7-11 by means of a pipe thread 7-9 and a hose straight joint 7-10, and a sliding sleeve frame 7-8 is sleeved on the outer wall of the oil seal box. The oil seal box moves up and down along the sliding sleeve frame 7-8 under the pressure of the spring 7-7.

[0049] After adding transformer oil, a fixed liquid level is formed in the oil seal clamping mechanism 7, gas emerges from below the liquid level and bubbles are displayed, and the gas is discharged at the liquid level overflow port. When the gas stops discharging, the last 100ml gas sample is sealed in the retention bottle. Before operation, transformer oil should be added to the oil box of the oil seal clamping mechanism. The liquid level should be added to the overflow port and can flow out from the discharge hose. If you choose to install the gas sample retention bottle with oil suction, you can avoid oil filling.

[0050] The gas sampling method of the transformer automatic exhaust sampler adopted in this embodiment comprises the following steps:

[0051] When there is no gas in the transformer or the gas is exhausted, the housing of the oil-gas separator is filled with transformer oil, the float floats up, and the top seals the exhaust port to prevent the transformer oil from being discharged from the exhaust port. At this time, the magnetic steel block at the bottom of the float is away from the normally closed magnetic reed switch, making it in a closed state. The power supply circuit of the intermediate relay is connected. When the gas relay issues a gas alarm, the intermediate relay is triggered to pull in, and the solenoid valve opens to discharge the transformer oil. When the residual oil in the pipe is drained, the gas enters the oil-gas separator and the oil level drops. When the oil level drops to the point where the magnetic steel block is close to the normally closed magnetic reed switch, the moving piece is separated from the static piece, the power supply circuit is cut off, and the solenoid valve is closed. At this time, the gas from the gas relay is guided by the transformer oil and discharged into the oil-gas separator, and enters the gas sample retention bottle through the open exhaust port through the angle exhaust valve.

[0052] 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 sampler, including a gas sample retention bottle, an oil seal clamping mechanism, an oil cup, a solenoid valve and a control system, characterized in that: It also includes an oil-gas separator, a straight-through oil drain valve and an angle-through exhaust valve. The gas relay on the transformer is connected to the oil-gas separator by an air guide pipe. The angle-through exhaust valve on the oil-gas separator is connected to a gas sample retention bottle in a floating manner with an oil seal clamping mechanism. The oil seal clamping mechanism provides an upward thrust for the gas sample retention bottle so that the gas inlet end of the gas sample retention bottle is connected to the oil-gas separator through the angle-through exhaust valve. An oil drain port of the oil-gas separator is connected to an oil cup by a straight-through oil drain valve, and another oil drain port of the oil-gas separator is connected to an oil drain pipeline by a solenoid valve, a 90-degree hose connector, and the control system is connected to the solenoid valve and a normally closed reed switch. The oil-gas divider comprises a divider shell with an exhaust passage and an exhaust port, a centering sliding pressure sleeve, a float, a switch box body and a normally closed magnetic reed switch. The exhaust passage on the divider shell is connected with the exhaust port and is connected with the outside through the exhaust port. A float is arranged in the hollow inner cavity of the divider shell. The top of the float is sleeved in the centering sliding pressure sleeve. The centering sliding pressure sleeve is connected and fixed with the inner thread of the center hole of the divider shell by an external thread. The float moves up and down along the centering sliding pressure sleeve to seal or open the exhaust port. The bottom of the float is connected with a magnetic steel block. A switch box body is arranged at the bottom of the divider shell. A guide ring groove is prefabricated outside the switch box body. The guide ring groove is used to limit the guide column arranged at the bottom of the float. A normally closed magnetic reed switch used in conjunction with the magnetic steel block is installed in the switch box body. The oil seal clamping mechanism comprises an oil seal box, an oil seal box cover with an oil filling port and an air nozzle, a sliding sleeve, a spring and a spring seat. The oil seal box cover is interference fitted at the opening on the upper surface of the oil seal box. One end of the air nozzle extends out of the oil seal box cover. A first air pipe is welded to the other end of the air nozzle, and the first air pipe is inserted under the sealing oil. The oil seal box comprises an oil storage cavity and an extension pipe isolated from each other. A second air pipe for exhaust is embedded and cast at a position off-center of the oil seal box. The lower end of the second air pipe outlet passes through the oil storage cavity and enters the top of the extension pipe. The second air pipe is connected to the extension pipe, and the bottom of the extension pipe is connected to the hose direct joint and the exhaust hose. The exhaust hose is used to guide the gas in the oil storage chamber guided by the second air pipe out of the oil seal box and prevent external gas from entering the gas sample retention bottle; the outer wall of the extension pipe of the oil seal box is sleeved with a spring, and the spring is crimped between the bottom of the extension pipe of the oil seal box and the spring seat at the bottom of the oil seal box. The extension pipe of the oil seal box is connected to the hose direct joint and the exhaust hose, and a sliding sleeve frame is sleeved on the outer wall of the oil seal box, and the oil seal box moves up and down along the sliding sleeve frame under the action of the spring pressure.

2. The transformer automatic exhaust sampler according to claim 1, characterized in that: The float comprises a sealing spindle and a hollow cylindrical sphere. The upper end of the sealing spindle is connected with a tip for sealing the exhaust port of the diverter housing. The lower end of the sealing spindle is embedded in the mounting hole on the upper surface of the hollow cylindrical sphere. The outer peripheral surface of the sealing spindle is provided with a plurality of axial grooves for ventilation.

3. The transformer automatic exhaust sampler according to claim 1 or 2, characterized in that: A sealing rubber ring is arranged at the connection between the centering sliding pressing sleeve and the diverter shell.

4. The transformer automatic exhaust sampler according to claim 1 or 2, characterized in that: A sealing rubber ring is provided at the connection between the switch box body and the diverter shell.

5. The transformer automatic exhaust sampler according to claim 1, comprising a bottle body, characterized in that: The closure of the bottle is sealed with a spring, and the closure of the bottle is sealed with a spring.

6. A method for collecting gas from an automatic exhaust sampler for a transformer, implemented by using the automatic exhaust sampler for a transformer as claimed in claim 1, characterized in that: The following steps are involved: When there is no gas in the transformer or the gas is exhausted, the oil-gas separator is filled with transformer oil, the float floats up, and the top seals the exhaust port to prevent the transformer oil from being discharged from the exhaust port. At this time, the magnetic steel block at the bottom of the float is away from the normally closed reed switch, so that the power circuit is in the on state; when the gas relay sends out a gas alarm signal, it triggers the intermediate relay to energize, and the solenoid valve opens to discharge the transformer oil in the oil-gas separator. When the residual oil in the pipe is drained, the gas enters the separator and the oil level drops. When the oil level drops to the point where the magnetic steel block is close to the normally closed reed switch, the moving piece and the static piece of the reed switch are separated, the power circuit is cut off, and the solenoid valve is closed. At this time, the gas from the gas relay is guided by the transformer oil and discharged into the oil-gas separator, and enters the gas sample retention bottle through the gas channel of the angle exhaust valve.

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