An oil-immersed transformer

Abstract

The application relates to the technical field of power supply equipment, and discloses an oil-immersed transformer which comprises a transformer box body, radiating fins, a high-voltage wiring rack, a low-voltage wiring rack, an oil pillow and a detection device; the detection device comprises a gas relay, and the gas relay is internally provided with an upper float, a lower float, an adjusting screw rod and a control pressure plate. The upper float can be first lowered and then rotated to rotate the swing arm, the initial spacing between a permanent magnet and a vacuum normally-open switch is increased, and the risk of false triggering is reduced; the lower float responds to oil leakage and short-circuit faults respectively according to different displacements, and fault distinguishing and alarm are realized. The height of an oil-gas distribution plate can be changed through an adjusting knob, the short-circuit alarm triggering threshold can be flexibly adjusted, and different specifications of transformers can be adapted. The control pressure plate can be pressed to simulate an oil leakage working condition to complete loop self-checking, the contact is automatically switched to a test system during testing, and false alarm on site is avoided, the gas protection false action can be reduced, operation and maintenance are facilitated, and the operation reliability of the oil-immersed transformer is improved.

Description

Technical Field

[0001] This application relates to the field of power supply equipment technology, and in particular to an oil-immersed transformer. Background Technology

[0002] Oil-immersed transformers are core equipment in power supply systems. Transformer malfunctions are often accompanied by internal gas production or oil level changes. Gas relays, as key protection devices, are mainly used to monitor internal short circuits, oil leaks, and other faults in transformers. When a fault occurs, they output alarm signals to ensure the safe operation of the equipment.

[0003] Existing gas relays mostly rely on a float and a permanent magnet to directly trigger the switch. Even slight float movement or oil flow disturbance can cause the permanent magnet to approach the switch, easily leading to false alarms from the protection device. Frequent false alarms can interfere with maintenance personnel's judgment and reduce power supply reliability. Furthermore, traditional relays struggle to distinguish between oil leakage and internal short circuit faults; both types of faults send identical alarm signals, making it difficult for maintenance personnel to quickly pinpoint the fault type, resulting in low troubleshooting efficiency. To address these issues, this application proposes an oil-immersed transformer. Summary of the Invention

[0004] This application proposes an oil-immersed transformer that has the advantage of increasing the distance between the permanent magnet and the normally open vacuum switch to prevent false triggering, thereby solving the problem of false alarms caused by the erroneous triggering of the normally open vacuum switch.

[0005] To achieve the above objectives, this application adopts the following technical solution: an oil-immersed transformer, including a transformer housing, wherein the transformer housing is internally equipped with an iron core winding, leads, a vacuum circuit breaker, and filled with mineral oil; heat sinks are provided on both sides of the outer surface of the transformer housing; a high-voltage terminal block and a low-voltage terminal block are respectively provided on the top of the heat sinks near the sides; a connecting bracket is fixedly installed on the rear side of the outer surface of the transformer housing near the top; an oil conservator is fixedly installed at one end of the connecting bracket; connecting pipes are provided on the bottom surface of the oil conservator near both ends; the connecting pipes connect the inner cavity of the oil conservator to the inner cavity of the transformer housing; and a detection device is provided on the top of the transformer housing between the high-voltage terminal block and the low-voltage terminal block.

[0006] Furthermore, the detection device includes an oil guide pipe, with a bypass pipe provided at the bottom of the outer surface of the oil guide pipe. The bottom of the bypass pipe is connected to the transformer tank, and the oil guide pipe is connected to the inner cavity of the transformer tank through the bypass pipe. A sealing flange is fixedly installed at one end of the oil guide pipe, and a gas relay is fixedly installed at the other end of the oil guide pipe. A connecting pipe is fixedly installed at one end of the gas relay, and one end of the connecting pipe is connected to and communicates with the oil tank.

[0007] Furthermore, the gas relay includes a first housing and a second housing, which are connected. The top of the first housing has a threaded hole, and an adjusting screw is fitted inside the threaded hole. An upper guide rod is fixedly installed on the top of the inner wall of the second housing near both ends, and an upper float is movably installed on the outer surface of the upper guide rod. A lower guide rod is fixedly installed on the bottom of the inner wall of the second housing near both ends, and a lower float is movably installed on the outer surface of the lower guide rod through a sliding fit. A first mounting bracket and a second mounting bracket are fixedly installed on the front and back of the inner wall of the second housing. A gap is left between the first and second mounting brackets and the inner wall of the second housing, and a switching slider is movably installed inside the gap. A lower pressure rod is movably installed on the top of the second housing through a telescopic mechanism. A positioning partition is provided on the inner wall of the second housing near the center, and a sealing rod is fixedly installed on the bottom of the positioning partition.

[0008] Furthermore, an adjustment knob is fixedly installed on the top of the adjustment screw, a flow divider is sleeved on the bottom of the adjustment screw, an inclined guide plate is provided at the front end of the flow divider, a high-speed oil-gas flow divider is provided at the bottom of the flow divider near the end, a horizontal guide plate is fixedly installed at the front end of the high-speed oil-gas flow divider, and side baffles are provided at the bottom of the horizontal guide plate near both sides.

[0009] Furthermore, a hinge sleeve is fitted on the outer surface of the upper float, and rotating swing arms are fitted on both sides of the outer surface of the hinge sleeve. A limiting groove is formed at the top of the rotating swing arm, and a first sliding hole is formed inside the limiting groove near one end. The first sliding hole slides in cooperation with the upper guide rod. A first permanent magnet is provided on both sides of the rotating swing arm near the first sliding hole. An auxiliary float is fixedly fitted on one end of the rotating swing arm.

[0010] Furthermore, the lower float has an exhaust hole at its top, which slides in conjunction with the sealing rod. The lower float is arc-shaped and has oil baffles at both ends. Mounting plates are fixedly installed on both sides of the outer surface of the lower float. Second permanent magnets are installed on both sides of the mounting plates near the lower float. The top of the mounting plate has a second sliding hole. The front end of the horizontal guide plate is close to the mounting plate and remains flush with it.

[0011] Furthermore, a connecting plate is provided on one side of the switching slider near both ends. A conductive sheet is provided on the front of the connecting plate. An alarm contact is provided on the front of the conductive sheet near the switching slider, and a test contact is provided on the front of the conductive sheet away from the switching slider.

[0012] Specifically, the alarm system is triggered when the alarm contact is in the ON state, and the test system is triggered when the test contact is in the ON state.

[0013] Specifically, a connecting seat is provided on the front of the switching slider near the bottom, and a guide plate is provided on the top of the connecting seat near both ends. An oblique guide groove is provided on one side of the guide plate.

[0014] Specifically, the inclined guide groove is in an inclined state.

[0015] Furthermore, a control pressure plate is fixedly installed on the top of the lower pressure rod, and a return spring is provided at the bottom of the control pressure plate located outside the lower pressure rod. The bottom of the return spring is in contact with the top surface of the second housing. A transmission push plate is fixedly installed on the bottom of the lower pressure rod, and guide pins are provided on both sides of the transmission push plate near the bottom. The guide pins slide with the inclined guide groove, and in the initial state, the guide pins are located inside the inclined guide groove near the top. An upper pressure head is provided on the front of the transmission push plate near the top, and a lower pressure head is provided on the front of the transmission push plate near the bottom. The upper pressure head is located above the upper float, and the lower pressure head is located above the lower float.

[0016] Furthermore, wire holders are fixedly installed at both ends of the first mounting bracket, and a normally open vacuum switch is provided inside the wire holder. The normally open vacuum switch is connected to the wire holder through a wire. A fixing seat is provided on the back of the first mounting bracket, and the fixing seat is fixedly connected to the inner wall of the second housing. The conductive sheet is movably installed in the gap formed between the first mounting bracket, the fixing seat, and the second housing.

[0017] Specifically, the structure of the second mounting bracket is the same as that of the first mounting bracket, except that the second mounting bracket contains two normally open vacuum switches.

[0018] Specifically, the first and second mounting brackets are in contact with the alarm contacts in the initial state, at which time the alarm contacts are in the connected state and the alarm system is in the state of being ready to be activated.

[0019] Furthermore, when the upper float moves down to its limit position, the first permanent magnet is positioned corresponding to the normally open vacuum switch in the first mounting bracket, and when the lower float moves up or down to its limit position, the second permanent magnet is positioned corresponding to the normally open vacuum switch located above or below in the second mounting bracket.

[0020] This application has the following beneficial effects.

[0021] 1. The upper float descends first and then the swing arm rotates, increasing the initial distance between the permanent magnet and the normally open vacuum switch, avoiding triggering the switch with slight disturbances, reducing false gas alarms, and improving the overall reliability of the detection device.

[0022] 2. By responding to oil leakage and short circuit conditions at different displacement positions of the lower float, and triggering different normally open vacuum switches, the two types of faults can be differentiated into alarms, which makes it easier for maintenance personnel to quickly distinguish the fault type and prevent alarm confusion.

[0023] 3. The height of the oil-gas diverter plate and horizontal guide plate can be changed by rotating the adjustment knob, and the short-circuit fault alarm trigger threshold can be flexibly adjusted. It can be adapted to a variety of oil-immersed transformers of different specifications, thus expanding the application range of the device.

[0024] 4. Pressing the control plate can drive the upper and lower pressure heads to press down the float, simulating an oil leak and completing the alarm circuit self-test; after releasing the pressure plate, the float mechanism jamming fault can be judged according to the float reset status, which is convenient for timely repair.

[0025] 5. During the self-test, the contact can be switched to the test system simultaneously. The test action will not trigger an actual alarm on site, avoiding false alarms that may interfere with normal operation and ensuring the stability of the on-site equipment.

[0026] 6. During testing, the float moves down to open the vent, automatically expelling the gas accumulated below the float, eliminating false alarms caused by gas accumulation, resolving the potential for false alarms caused by gas buildup during long-term operation, and improving the practicality and long-term operational stability of the device. Attached Figure Description

[0027] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0028] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein: Figure 1 This is a structural diagram of the present invention; Figure 2 This invention relates to a flow guiding device. Figure 3 This invention relates to a structural detection device; Figure 4 This is a diagram of the internal structure of the detection device of the present invention; Figure 5 This is a diagram of the internal main structure of the detection device of the present invention; Figure 6 This is a diagram of the adjustment structure of the present invention; Figure 7 This is a structural diagram of the float of the present invention; Figure 8 This is a structural diagram of the lower float of the present invention; Figure 9 This is a diagram showing the switching structure of the present invention; Figure 10 This is a cross-sectional view of the switching structure of the present invention; Figure 11This is a diagram of the downward pressing structure of the present invention; Figure 12 This is a diagram of the trigger structure of the present invention.

[0029] In the diagram: 1. Transformer housing; 2. Heat sink; 3. High-voltage terminal block; 4. Low-voltage terminal block; 5. Connecting bracket; 6. Oil conservator; 7. Connecting pipe; 8. Detection device; 81. Oil guide pipe; 82. Bypass pipe; 83. Sealing flange; 84. Gas relay; 841. First housing; 842. Second housing; 843. Adjusting screw; 844. Upper guide rod; 845. Upper float; 846. Lower guide rod; 847. Lower float; 848. First mounting bracket; 849. Second mounting bracket; 850. Switching slider; 851. Lower pressure rod; 852. Positioning partition; 853. Sealing rod; 854. Adjusting knob; 855. Diverter plate; 856. Angled guide plate; 857. High-speed oil-gas diverter plate; 858. Horizontal guide plate 859. Side baffle; 860. Hinge sleeve; 861. Rotating swing arm; 862. Limiting slide groove; 863. First sliding hole; 864. First permanent magnet; 865. Auxiliary float; 866. Exhaust hole; 867. Oil baffle; 868. Mounting plate; 869. Second permanent magnet; 870. Second sliding hole; 871. Connecting plate; 872. Conductive sheet; 873. Alarm contact; 874. Test contact; 875. Connecting seat; 876. Guide plate; 877. Angled guide groove; 878. Control pressure plate; 879. Reset spring; 880. Transmission push plate; 881. Guide pin; 882. Upper pressure head; 883. Lower pressure head; 884. Wire clamp; 885. Vacuum normally open switch; 886. Fixed seat; 85. Connecting pipe. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0031] Please refer to an oil-immersed transformer. Figure 1The transformer includes a transformer housing 1, which contains an iron core winding, leads, a vacuum circuit breaker, and is filled with mineral oil. When the vacuum circuit breaker is activated, it can disconnect the circuit, at which point the iron core winding stops working. Heat sinks 2 are provided on both sides of the outer surface of the transformer housing 1. High-voltage terminal blocks 3 and low-voltage terminal blocks 4 are respectively provided on the top of the heat sinks 2 near the sides. A connecting bracket 5 is fixedly installed on the rear side of the outer surface of the transformer housing 1 near the top. An oil conservator 6 is fixedly installed on one end of the connecting bracket 5. A connecting pipe 7 is provided on the bottom surface of the oil conservator 6 near both ends, and the connecting pipe 7 connects the inner cavity of the oil conservator 6 to the inner cavity of the transformer housing 1. A detection device 8 is provided on the top of the transformer housing 1 between the high-voltage terminal block 3 and the low-voltage terminal block 4.

[0032] Please see Figures 1-2 The detection device 8 includes an oil guide pipe 81, a bypass pipe 82 is provided at the bottom of the outer surface of the oil guide pipe 81, the bottom of the bypass pipe 82 is connected to the transformer tank 1, the oil guide pipe 81 is connected to the inner cavity of the transformer tank 1 through the bypass pipe 82, a sealing flange 83 is fixedly installed at one end of the oil guide pipe 81, a gas relay 84 is fixedly installed at the other end of the oil guide pipe 81, a connecting pipe 85 is fixedly installed at one end of the gas relay 84, and one end of the connecting pipe 85 is connected to and communicates with the oil tank 6.

[0033] Please see Figures 3-5 The gas relay 84 includes a first housing 841 and a second housing 842, which are connected. The top of the first housing 841 has a threaded hole, and an adjusting screw 843 is fitted inside the threaded hole. An upper guide rod 844 is fixedly installed on the top of the inner wall of the second housing 842 near both ends. An upper float 845 is movably installed on the outer surface of the upper guide rod 844. A lower guide rod 846 is fixedly installed on the bottom of the inner wall of the second housing 842 near both ends. The outer surface of the lower guide rod 846 moves through a sliding engagement. A lower float 847 is installed. A first mounting bracket 848 and a second mounting bracket 849 are fixedly installed on the front and back of the inner wall of the second outer shell 842. A gap is left between the first mounting bracket 848 and the second mounting bracket 849 and the inner wall of the second outer shell 842, and a switching slider 850 is movably installed inside the gap. A lower pressure rod 851 is movably installed on the top of the second outer shell 842 by telescopic means. A positioning partition 852 is provided near the center of the inner wall of the second outer shell 842, and a sealing rod 853 is fixedly installed at the bottom of the positioning partition 852.

[0034] Please see Figure 6An adjustment knob 854 is fixedly installed on the top of the adjustment screw 843. A flow divider 855 is sleeved on the bottom of the adjustment screw 843. An inclined guide plate 856 is provided at the front end of the flow divider 855. A high-speed oil-gas flow divider 857 is provided at the bottom of the flow divider 855 near the end. A horizontal guide plate 858 is fixedly installed at the front end of the high-speed oil-gas flow divider 857. Side baffles 859 are provided at the bottom of the horizontal guide plate 858 near both sides.

[0035] The position of the diverter plate 855 inside the first housing 841 can be adjusted by rotating the adjustment knob 854. Rotating the adjustment knob 854 clockwise increases the height of the diverter plate 855 and the horizontal guide plate 858 inside the first housing 841, making it easier for the oil fluid containing gas to pass through the high-speed oil-gas diverter plate 857 and reach the area below the horizontal guide plate 858, thereby increasing the trigger threshold of the transformer short-circuit alarm. Conversely, rotating the adjustment knob 854 counterclockwise decreases the height of the diverter plate 855 and the horizontal guide plate 858 inside the first housing 841, thereby decreasing the trigger threshold of the transformer short-circuit alarm. This allows the trigger threshold for activating the alarm to be set according to different transformer specifications, improving the flexibility of the device in use.

[0036] Please see Figure 7 A hinge sleeve 860 is fitted on the outer surface of the upper float 845. Rotating swing arms 861 are fitted on both sides of the outer surface of the hinge sleeve 860. A limiting groove 862 is provided on the top of the rotating swing arm 861. A first sliding hole 863 is provided in the limiting groove 862 near one end. The first sliding hole 863 is slidably engaged with the upper guide rod 844. A first permanent magnet 864 is provided on both sides of the rotating swing arm 861 near the first sliding hole 863. An auxiliary float 865 is fixedly fitted on one end of the rotating swing arm 861.

[0037] Please see Figure 8 The lower float 847 has an exhaust hole 866 at its top, which slides in conjunction with the sealing rod 853. The lower float 847 is arc-shaped and has oil baffles 867 at both ends. Mounting plates 868 are fixedly installed on both sides of the outer surface of the lower float 847. Second permanent magnets 869 are installed on both sides of the mounting plates 868 near the lower float 847. The top of the mounting plates 868 has a second sliding hole 870. The front end of the horizontal guide plate 858 is close to the mounting plate 868 and is flush with it.

[0038] When a short circuit occurs in the coil inside transformer housing 1, a large amount of gas will be released in a short time. This gas quickly enters the gas relay 84 through the bypass pipe 82 and the oil guide pipe 81. After entering the gas relay 84, due to the increased oil flow rate, the oil containing gas directly impacts the high-speed oil-gas splitter plate 857 and flows along the inclined surface of the high-speed oil-gas splitter plate 857 to below the horizontal guide plate 858. Under the restriction of the side baffle 859 and the fact that the front end of the horizontal guide plate 858 is close to the mounting plate 868 and remains flush, the oil containing gas flows to below the oil baffle plate 867, causing the gas to accumulate below the lower float 847. This causes the lower float 847 to move upward under the action of buoyancy, making the gas accumulate below the lower float 847. The two permanent magnets 869 and the vacuum normally open switch 885 located above the second mounting bracket 849 are in a corresponding state. At this time, the vacuum normally open switch 885 inside the first mounting bracket 848 and the vacuum normally open switch 885 located below the second mounting bracket 849 are both in an active state, thereby activating the alarm to indicate that a short circuit has occurred inside the transformer tank 1. This activates the vacuum circuit breaker and disconnects the line in time, allowing the iron core winding to be disconnected in time, preventing the continued generation of gas, and protecting the transformer tank 1 in time to avoid a gas explosion. This improves the safety performance of the device. In addition, this alarm method can be distinguished from oil leak alarms, avoiding alarm confusion and preventing operators from handling the problem in time, thus improving the accuracy of the device's alarm.

[0039] Please see Figures 9-10 A connecting plate 871 is provided on one side of the switching slider 850 near both ends. A conductive sheet 872 is provided on the front of the connecting plate 871. An alarm contact 873 is provided on the front of the conductive sheet 872 near the switching slider 850. A test contact 874 is provided on the front of the conductive sheet 872 away from the switching slider 850.

[0040] Please see Figure 10 The alarm system is triggered when alarm contact 873 is in the ON state, and the test system is triggered when test contact 874 is in the ON state.

[0041] Please see Figure 10 A connecting seat 875 is provided on the front of the switching slider 850 near the bottom. A guide plate 876 is provided on the top of the connecting seat 875 near both ends. An oblique guide groove 877 is provided on one side of the guide plate 876.

[0042] Please see Figure 10 The inclined guide groove 877 is in an inclined state.

[0043] When the alarm system is tested, as the transmission push plate 880 moves downward, the inclined guide groove 877 is tilted and the guide pin 881 slides with the inclined guide groove 877. The guide pin 881 pushes the guide plate 876 to move laterally, thereby causing the conductive sheet 872 to move synchronously. This causes the alarm contact 873 to disengage from the first mounting bracket 848, while the test contact 874 contacts the first mounting bracket 848. Since the test contact 874 is connected to the test system, when the vacuum normally open switch 885 is triggered, it activates the test system instead of the alarm system, avoiding alarm confusion and improving the operational stability of the device.

[0044] Please see Figure 4 and Figure 11 A control plate 878 is fixedly installed on the top of the lower pressure rod 851. A return spring 879 is provided at the bottom of the control plate 878, located outside the lower pressure rod 851. The bottom of the return spring 879 is in contact with the top surface of the second housing 842. A transmission push plate 880 is fixedly installed on the bottom of the lower pressure rod 851. Guide pins 881 are provided on both sides of the transmission push plate 880 near the bottom. The guide pins 881 slide with the inclined guide groove 877. In the initial state, the guide pins 881 are located inside the inclined guide groove 877 near the top. An upper pressure head 882 is provided on the front of the transmission push plate 880 near the top. A lower pressure head 883 is provided on the front of the transmission push plate 880 near the bottom. The upper pressure head 882 is located above the upper float 845, and the lower pressure head 883 is located above the lower float 847.

[0045] When testing the alarm system, the control plate 878 can be pressed down, thereby driving the transmission push plate 880. The upper pressure head 882 and the lower pressure head 883 move down synchronously. Since the upper pressure head 882 is located above the upper float 845 and the lower pressure head 883 is located above the lower float 847, the downward movement of the upper pressure head 882 and the lower pressure head 883 will drive the upper float 845 and the lower float 847 down, thus simulating an oil leak inside the second housing 842, achieving the effect of alarm testing and preventing alarms from escalating. This improves the detection completeness of the device by eliminating the problem of the alarm system failing to detect it. In addition, after the test is completed and the control plate 878 is released, the upper float 845 and the lower float 847 are reset under the action of buoyancy, and the alarm system is deactivated. If the alarm system is continuously triggered, it means that the upper float 845 and the lower float 847 cannot be reset normally, and it also means that the upper float 845 and the lower float 847 cannot move downward when the buoyancy is lost. In this case, the operator needs to inspect the internal structure of the second outer shell 842.

[0046] Please see Figure 4 and Figure 12The first mounting bracket 848 has wire holders 884 fixedly mounted at both ends. A vacuum normally open switch 885 is provided inside the wire holder 884 and is connected to the wire holder 884 via a wire. A fixing seat 886 is provided on the back of the first mounting bracket 848 and is fixedly connected to the inner wall of the second housing 842. A conductive sheet 872 is movably mounted in the gap formed between the first mounting bracket 848, the fixing seat 886, and the second housing 842.

[0047] When the oil level inside the second outer casing 842 drops, the buoyancy of the upper float 845 decreases, causing the upper float 845 and the rotating arm 861 to move downwards until the first sliding hole 863 disengages from the upper guide rod 844. Since the rotating arm 861 and the hinge sleeve 860 are in a movable sleeve state, and the auxiliary float 865 provides a certain buoyancy, the rotating arm 861 rotates under this action, causing the limiting slide groove 862 to rotate to a horizontal position. At this time, the first permanent magnet 864 and the normally open vacuum switch 885 inside the first mounting bracket 848 are in a corresponding state. Under the magnetic force of the first permanent magnet 864, the normally open vacuum switch 885 inside the first mounting bracket 848 is closed, thereby activating the alarm state, indicating that gas is generated inside the transformer tank 1 and causing the second... As the liquid level inside the outer casing 842 decreases, in traditional devices, the distance between the first permanent magnet 864 and the normally open vacuum switch 885 is relatively close. The first permanent magnet 864 is in a corresponding state with the normally open vacuum switch 885 simply by rotating. During use, the normally open vacuum switch 885 is easily triggered accidentally, leading to a false alarm. However, the first permanent magnet 864 used in this application first decreases in height, and then makes a circular motion under the rotation of the rotating arm 861 until the rotating arm 861 is in a horizontal state. Only then can the first permanent magnet 864 be in a corresponding state with the normally open vacuum switch 885. This increases the initial distance between the first permanent magnet 864 and the normally open vacuum switch 885, thereby significantly reducing the problem of the normally open vacuum switch 885 being falsely triggered and improving the reliability of the device.

[0048] When oil leakage occurs in transformer housing 1, the oil level inside the second outer casing 842 will continuously decrease, causing the lower float 847 to drop in height. At the same time, the mounting plate 868 moves synchronously with the lower float 847, so that the second permanent magnet 869 corresponds to the vacuum normally open switch 885 located at the bottom inside the second mounting bracket 849. At this time, the vacuum normally open switch 885 in the first mounting bracket 848 and the vacuum normally open switch 885 located at the bottom in the second mounting bracket 849 are both activated, thereby activating the alarm system and indicating that oil leakage has occurred.

[0049] Please see Figure 12The structure of the second mounting bracket 849 is the same as that of the first mounting bracket 848, except that the second mounting bracket 849 contains two normally open vacuum switches 885.

[0050] Please see Figure 10 and Figure 12 In the initial state, the first mounting bracket 848 and the second mounting bracket 849 are in contact with the alarm contact 873. At this time, the alarm contact 873 is in the connected state, and the alarm system is in the state of waiting to be activated.

[0051] Please see Figure 4 , Figures 7-8 and Figure 12 When the upper float 845 moves down to its limit position, the first permanent magnet 864 is in the position corresponding to the normally open vacuum switch 885 in the first mounting bracket 848. When the lower float 847 moves up or down to its limit position, the second permanent magnet 869 is in the position corresponding to the normally open vacuum switch 885 located above or below in the second mounting bracket 849.

[0052] During the testing of the alarm system, as the lower float 847 moves downward and the vent 866 disengages from the sealing rod 853, the vent 866 is in an open state. At this time, the gas remaining below the lower float 847 will be discharged from the vent 866. This avoids the problem that during long-term use, some gas may accumulate below the lower float 847, causing the lower float 847 to rise continuously and eventually trigger the normally open vacuum switch 885 inside the second mounting bracket 849, resulting in a false alarm. This improves the practicality of the device.

Claims

1. An oil-immersed transformer, characterized in that, The transformer includes a transformer housing (1), which is equipped with an iron core winding, leads, a vacuum circuit breaker, and is filled with mineral oil. Heat sinks (2) are provided on both sides of the outer surface of the transformer housing (1). A high-voltage terminal block (3) and a low-voltage terminal block (4) are respectively provided on the top of the heat sinks (2) near the two sides. A connecting bracket (5) is fixedly installed on the rear side of the outer surface of the transformer housing (1) near the top. An oil tank (6) is fixedly installed at one end of the connecting bracket (5). A connecting pipe (7) is provided on the bottom surface of the oil tank (6) near both ends. The connecting pipe (7) connects the inner cavity of the oil tank (6) to the inner cavity of the transformer housing (1). A detection device (8) is provided on the top of the transformer housing (1) between the high-voltage terminal block (3) and the low-voltage terminal block (4).

2. The oil-immersed transformer according to claim 1, characterized in that, The detection device (8) includes an oil guide pipe (81), and a bypass pipe (82) is provided at the bottom of the outer surface of the oil guide pipe (81). The bottom of the bypass pipe (82) is connected to the transformer box (1). The oil guide pipe (81) is connected to the inner cavity of the transformer box (1) through the bypass pipe (82). A sealing flange (83) is fixedly installed at one end of the oil guide pipe (81), and a gas relay (84) is fixedly installed at the other end of the oil guide pipe (81). A connecting pipe (85) is fixedly installed at one end of the gas relay (84), and one end of the connecting pipe (85) is connected to and communicates with the oil tank (6).

3. An oil-immersed transformer according to claim 2, characterized in that, The gas relay (84) includes a first housing (841) and a second housing (842), which are connected. The top of the first housing (841) has a threaded hole, and an adjusting screw (843) is fitted inside the threaded hole. An upper guide rod (844) is fixedly installed on the top of the inner wall of the second housing (842) near both ends. An upper float (845) is movably installed on the outer surface of the upper guide rod (844). A lower guide rod (846) is fixedly installed on the bottom of the inner wall of the second housing (842) near both ends. The outer surface of the lower guide rod (846) is movably installed by a sliding fit. A lower float (847) is installed. A first mounting bracket (848) and a second mounting bracket (849) are fixedly installed on the front and back sides of the inner wall of the second outer shell (842). A gap is left between the first mounting bracket (848) and the second mounting bracket (849) and the inner wall of the second outer shell (842), and a switching slider (850) is movably installed inside the gap. A lower pressure rod (851) is movably installed on the top of the second outer shell (842) by telescopic means. A positioning partition (852) is provided near the center of the inner wall of the second outer shell (842), and a sealing rod (853) is fixedly installed at the bottom of the positioning partition (852).

4. An oil-immersed transformer according to claim 3, characterized in that, An adjustment knob (854) is fixedly installed on the top of the adjustment screw (843), and a flow divider plate (855) is sleeved on the bottom of the adjustment screw (843). An inclined guide plate (856) is provided at the front end of the flow divider plate (855), and a high-speed oil-gas flow divider plate (857) is provided at the bottom of the flow divider plate (855) near the end. A horizontal guide plate (858) is fixedly installed at the front end of the high-speed oil-gas flow divider plate (857), and a side baffle (859) is provided at the bottom of the horizontal guide plate (858) near both sides.

5. An oil-immersed transformer according to claim 4, characterized in that, The outer surface of the upper float (845) is fitted with a hinge sleeve (860), and the two sides of the outer surface of the hinge sleeve (860) are fitted with rotating swing arms (861). The top of the rotating swing arm (861) is provided with a limiting groove (862), and a first sliding hole (863) is provided in the limiting groove (862) near one end. The first sliding hole (863) is slidably engaged with the upper guide rod (844). A first permanent magnet (864) is provided on both sides of the rotating swing arm (861) near the first sliding hole (863). An auxiliary float (865) is fixedly fitted on one end of the rotating swing arm (861).

6. An oil-immersed transformer according to claim 5, characterized in that, The lower float (847) has an exhaust hole (866) at its top, which is slidably engaged with the sealing rod (853). The lower float (847) is arc-shaped and has oil baffles (867) at both ends. Mounting plates (868) are fixedly installed on both sides of the outer surface of the lower float (847). Second permanent magnets (869) are provided on both sides of the mounting plates (868) near the lower float (847). The top of the mounting plates (868) has a second sliding hole (870).

7. An oil-immersed transformer according to claim 6, characterized in that, A connecting plate (871) is provided on one side of the switching slider (850) near both ends. A conductive sheet (872) is provided on the front of the connecting plate (871). An alarm contact (873) is provided on the front of the conductive sheet (872) near the switching slider (850). A test contact (874) is provided on the front of the conductive sheet (872) away from the switching slider (850). The alarm system is triggered when the alarm contact (873) is in the ON state, and the test system is triggered when the test contact (874) is in the ON state. The switching slider (850) has a connecting seat (875) near the bottom of the front, and a guide plate (876) is provided at the top of the connecting seat (875) near both ends. An oblique guide groove (877) is provided on one side of the guide plate (876). The inclined guide groove (877) is in an inclined state.

8. An oil-immersed transformer according to claim 7, characterized in that, A control plate (878) is fixedly installed on the top of the lower pressure rod (851). A return spring (879) is provided at the bottom of the control plate (878) outside the lower pressure rod (851). The bottom of the return spring (879) is in contact with the top surface of the second housing (842). A transmission push plate (880) is fixedly installed on the bottom of the lower pressure rod (851). Guide pins (881) are provided on both sides of the transmission push plate (880) near the bottom. 1) It slides with the inclined guide groove (877), and in the initial state, the guide pin (881) is located inside the inclined guide groove (877) near the top. The transmission push plate (880) is provided with an upper pressure head (882) near the top on the front side, and a lower pressure head (883) is provided with a lower pressure head (883) near the bottom on the front side. The upper pressure head (882) is located above the upper float (845), and the lower pressure head (883) is located above the lower float (847).

9. An oil-immersed transformer according to claim 8, characterized in that, The first mounting bracket (848) has wire holders (884) fixedly installed at both ends. A vacuum normally open switch (885) is provided inside the wire holder (884), and the vacuum normally open switch (885) is connected to the wire holder (884) through a wire. A fixing seat (886) is provided on the back of the first mounting bracket (848), and the fixing seat (886) is fixedly connected to the inner wall of the second shell (842). The conductive sheet (872) is movably installed in the gap formed between the first mounting bracket (848), the fixing seat (886), and the second shell (842). The structure of the second mounting bracket (849) is the same as that of the first mounting bracket (848), except that the number of vacuum normally open switches (885) inside the second mounting bracket (849) is two; The first mounting bracket (848) and the second mounting bracket (849) are in contact with the alarm contact (873) in the initial state. At this time, the alarm contact (873) is in the connected state and the alarm system is in the state of waiting to be activated.

10. An oil-immersed transformer according to claim 9, characterized in that, When the upper float (845) moves down to its limit position, the first permanent magnet (864) is in the position corresponding to the normally open vacuum switch (885) in the first mounting bracket (848). When the lower float (847) moves up to its limit position, the second permanent magnet (869) is in the position corresponding to the normally open vacuum switch (885) located above in the second mounting bracket (849). When the lower float (847) moves down to its limit position, the second permanent magnet (869) is in the position corresponding to the normally open vacuum switch (885) located below in the second mounting bracket (849).

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