Double-floating-ball gas relay for transformer

Abstract

A double-floating-ball gas relay for a transformer belongs to the technical field of relays, is installed on an oil pipeline of a main connecting pipe of the transformer, oil flows in the oil pipeline, and further comprises an upper shell, a probe, a support, an upper floater shaft, an upper floater swing arm, an upper floater, an upper floater magnet frame, a limiting block, a limiting seat, a first fixing frame, a volume contact, a lower limit and a heavy hammer. The probe is arranged below the upper shell; the top end of the support is connected with the bottom end of the upper shell. The equipment has highly-intelligent and reliable monitoring and alarming functions, can sensitively sense various abnormal conditions in actual operation, sends out alarming signals through different triggering mechanisms under the abnormal conditions of internal gas accumulation, oil flow surge, oil leakage and the like, and takes corresponding measures in time, so that the working efficiency is improved, and the working efficiency is improved. And the normal working performance and reliability of the gas relay are ensured.

Description

Technical Field

[0001] This utility model belongs to the field of relay technology, specifically relating to a double float gas relay for transformers. Background Technology

[0002] In the current field of power system technology, gas relays, as key monitoring devices to ensure the safe and stable operation of transformers, are installed on the main oil pipeline of the transformer. During normal operation of the transformer, oil continuously circulates within the oil pipeline. The core function of the gas relay is to monitor two key parameters in real time: first, the volume of gas formed by the decomposition of transformer oil due to various physicochemical reactions during operation; and second, the flow velocity of the oil surge caused by faults such as short circuits and overloads in the transformer.

[0003] In related technology (Chinese utility model patent with announcement number CN207529875U), a double float gas relay for transformers is disclosed, including a base frame and an upper housing. The upper housing is flanged and connected to the base frame. A support frame is provided inside the base frame. Two counterweights are provided inside the support frame. One counterweight has an upper open cup at its end, and the other counterweight has a lower open cup at its end. The upper and lower open cups are respectively provided with permanent magnets. The permanent magnets are slidably connected to a vertical frame via a slide rail. A reed switch is provided on the vertical frame. The reed switch is electrically connected to a solenoid valve. A speed sensor is also provided on the frame. The end of the speed sensor is connected to an oil pump and a solenoid valve. The end of the oil pump is provided with a solenoid valve. The end of the solenoid valve is provided with an oil chamber. The oil chamber is respectively connected to the two open cups. The ends of the two open cups are respectively connected to probes. This relay can provide non-mechanical protection against gas generated inside the transformer.

[0004] In actual operating environments, gas relays are subjected to the combined effects of strong oil flow and high oil temperature. Under these complex and harsh conditions, the gas relay measurement data is prone to large errors, making it impossible for the monitoring data to accurately reflect the actual operating status of the transformer, thus affecting the normal operating performance and reliability of the gas relay. Utility Model Content

[0005] To address the problem that existing gas relays are subject to the combined effects of strong oil flow and high oil temperature, leading to large measurement errors and inaccurate data reflecting the actual operating condition of the transformer, this invention provides a dual-float gas relay for transformers. This relay possesses highly intelligent and reliable monitoring and alarm functions. In actual operation, it can sensitively detect various abnormal conditions, issuing alarm signals through different triggering mechanisms in cases of internal gas accumulation, oil flow surges, or oil leaks. The specific technical solution is as follows:

[0006] A dual-float gas relay for transformers is installed on the oil pipeline of the transformer's main connecting pipe, where oil flows. It further includes: an upper housing, a probe, a bracket, an upper float shaft, an upper float swing arm, an upper float, an upper float magnet holder, a limit block, a limit seat, a first fixing frame, a volumetric contact, a lower limit, and a counterweight. The probe is positioned below the upper housing. The top end of the bracket is connected to the bottom end of the upper housing. The upper float shaft is rotatably mounted on the bracket in a horizontal direction. The upper float swing arm is fixedly mounted on the upper float shaft. The upper float is fixedly mounted on the upper float swing arm. The upper float magnet... The frame is mounted on the upper float arm, and a magnet is provided inside the upper float magnet frame; the limiting block is located in the middle of the upper float arm; the limiting seat is located on the bracket; the first fixing frame is located on the bracket; the volume contact is mounted on the first fixing frame, and when the volume contact approaches the magnet inside the upper float magnet frame, the volume contact closes, and at the same time the limiting block and the limiting seat are locked, and the volume contact remains in an alarm state; the lower limit is located on the bracket, and the lower limit is used to limit the upper float; the counterweight is located at the end of the upper float arm.

[0007] The above technical solution further includes: a flow velocity shaft, a flow velocity baffle, a tension spring, a tension spring connecting rod, and an adjusting nut. The flow velocity shaft is rotatably mounted on the bracket; the flow velocity baffle is fixedly installed on the flow velocity shaft; one side of the tension spring is connected to the top of the flow velocity baffle; the tension spring connecting rod is connected to the other side of the tension spring and is also connected to the bracket; the adjusting nut is located at the end of the tension spring connecting rod opposite to the tension spring.

[0008] The above technical solution further includes: a first magnet frame, a reed switch frame, and a reed switch. The first magnet frame is disposed at the bottom end of the flow rate baffle, and a magnet is disposed inside the first magnet frame. The reed switch frame is fixedly installed on the bottom side wall of the support. The reed switch is disposed in the reed switch frame, and when the magnet in the first magnet frame approaches the reed switch, the reed switch closes under the attraction of the magnet and sends a trip signal.

[0009] In the above technical solution, a flow rate limiter is provided at the support.

[0010] The above technical solution further includes: a lower float shaft, a lower float swing arm, a lower float, a lower float magnet frame, a second fixing frame, and an oil loss contact. The lower float shaft is rotatably mounted on the bottom end of the bracket in a horizontal direction; the lower float swing arm is fixedly mounted on the lower float shaft; the lower float is fixedly mounted on the lower float swing arm; the lower float magnet frame is mounted on the side wall of the lower float swing arm, and a magnet is disposed inside the lower float magnet frame; the second fixing frame is fixedly mounted on the bracket; the oil loss contact is disposed on the second fixing frame, and when the magnet inside the lower float magnet frame approaches the oil loss contact, the oil loss contact closes under the attraction of the magnet.

[0011] In the above technical solution, the oil loss contact is connected in parallel with the reed switch.

[0012] In the above technical solution, an oil guide hole is provided at the bottom end of the flow rate baffle.

[0013] In the above technical solution, a flow stabilizer is provided at the bracket to ensure that the lower float is not affected by the forward and reverse oil flow.

[0014] The above technical solution also includes: a lower housing, a vent valve, and a terminal block. The lower housing is fixedly installed between the transformer main connecting pipe and the oil conservator to connect the oil circuit. The lower housing is also connected to the upper housing to seal the transformer oil inside the cavity. The vent valve is fixed to the outside of the upper housing. The terminal block passes through the upper housing and is used to connect a switching signal.

[0015] The advantages of this utility model for a transformer dual-float gas relay compared with the prior art are as follows:

[0016] I. Addressing the problem that existing gas relays are subject to the combined effects of strong oil flow and high oil temperature, leading to large measurement errors and inaccurate reflection of the transformer's actual operating status, this invention incorporates an early warning system for gas accumulation within the gas relay. Under abnormal conditions, the volume contacts remain closed in an alarm state, continuously alerting operators to any gas relay malfunctions and allowing for timely manual intervention. This ensures the gas relay effectively performs its normal measurement and monitoring function. Specifically, once the gas relay detects internal gas accumulation, it immediately issues an alarm. This allows maintenance personnel to identify potential faults such as insulation aging and localized overheating within the transformer as early as possible, preventing larger safety accidents caused by continuous gas accumulation and ensuring the safe and stable operation of the transformer.

[0017] Second, in view of the problem that the float in the existing gas relay is easily deformed or even damaged under the influence of oil flow impact and high temperature, which seriously affects the normal working performance and reliability of the gas relay, this utility model can quickly send a trip signal when oil flow surge occurs, which can cut off the circuit in time, prevent the oil flow impact caused by the fault from further damaging the key components of the transformer, effectively reduce the risk of equipment damage, and improve the safety of the entire power system.

[0018] Third, in response to the problem that existing equipment is prone to damage to the gas relay and the entire transformer when oil leakage occurs, causing safety hazards, in this utility model, the oil loss contact will close under the attraction of the magnet. At this time, the gas relay will send a trip signal to indicate that the gas relay is in an abnormal state. That is, this device can promptly alarm when oil leakage occurs, allowing maintenance personnel to quickly take measures to replenish the oil or repair the leak. This avoids poor heat dissipation and decreased insulation performance of the transformer due to low oil level, and prevents serious accidents such as fire caused by excessive oil temperature. It comprehensively ensures the safe and stable operation of the transformer.

[0019] In summary, this equipment possesses highly intelligent and reliable monitoring and alarm functions. In actual operation, it can keenly detect various abnormal situations. In cases of internal gas accumulation, oil surge, oil leakage, or other abnormal conditions, it will issue alarm signals through different triggering mechanisms and take corresponding measures in a timely manner to ensure the normal working performance and reliability of the gas relay. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the lower float of this utility model;

[0021] Figure 2 This is a schematic diagram of the probe structure of this utility model;

[0022] Figures 1 to 2 In the middle, 1. Upper shell, 2. Probe, 3. Flow rate baffle, 4. Oil guide hole, 5. Lower limit, 6. Counterweight, 7. Upper float shaft, 8. Volume contact, 9. First fixed frame, 10. Bracket, 11. Flow rate limit, 12. Flow rate shaft, 13. Oil loss contact, 14. Second fixed frame, 15. Reed switch, 16. Reed switch frame, 17. First magnet frame, 18. Lower float magnet frame, 19. Lower float shaft, 20. Lower float, 21. Lower float swing arm, 22. Flow stabilizer, 23. Adjusting nut, 24. Tension spring connecting rod, 25. Tension spring, 26. Upper float, 27. Upper float swing arm, 28. Upper float magnet frame, 29. Limit block, 30. Limit seat. Detailed Implementation

[0023] The following are specific implementation cases and appendices. Figures 1 to 2The present invention will be further described below, but the present invention is not limited to these embodiments.

[0024] A dual-float gas relay for transformers is installed on the oil pipeline of the transformer's main connecting pipe, where oil flows. It further includes: an upper housing 1, a probe 2, a bracket 10, an upper float shaft 7, an upper float swing arm 27, an upper float 26, an upper float magnet frame 28, a limiting block 29, a limiting seat 30, a first fixing frame 9, a volume contact 8, a lower limit 5, and a counterweight 6. The probe 2 is located below the upper housing 1. The top of the bracket 10 is connected to the bottom of the upper housing 1. The upper float shaft 7 is rotatably mounted on the bracket 10 in a horizontal direction. The upper float swing arm 27 is fixedly mounted on the upper float shaft 7. The upper float 26 is fixedly mounted on the upper float swing arm 27, and the upper float 26 drives the upper float swing arm 27 to rotate due to its own buoyancy. The upper float magnet frame 28 is mounted on the upper float swing arm 27, and a magnet is installed inside the upper float magnet frame 28. The internal magnets are protected from damage; a limiting block 29 is located in the middle of the upper float arm 27; a limiting seat 30 is located on the bracket 10; a first fixing frame 9 is located on the bracket 10; a volume contact 8 is installed on the first fixing frame 9, and when the volume contact 8 approaches the magnet inside the upper float magnet frame 28, the volume contact 8 closes, and at the same time, the limiting block 29 and the limiting seat 30 are locked, and the volume contact 8 remains in an alarm state; a lower limit 5 is located on the bracket 10, and the lower limit 5 is used to limit the upper float 26; a counterweight 6 is located at the end of the upper float arm 27.

[0025] During the operation of the gas relay, once gas accumulates inside the relay, the upper float 26, upper float arm 27, magnet located in the upper float magnet holder 28, limit block 29, and limit 30 will simultaneously rotate downwards around the upper float shaft 7. As the sinking process progresses, when the magnet located in the upper float magnet holder 28 approaches its matching volume contact 8, the volume contact 8 will close under the action of the magnetic field. At the same time, the limit block 29 will engage with the limit seat 30, and the two cooperate to form a stable locking structure. This locking structure can ensure that the volume contact 8 remains in this state after closing, continuously sending alarm signals to the outside, thereby realizing uninterrupted reminders of abnormal states of the gas relay, so that staff can promptly detect and handle related problems.

[0026] This equipment also includes: a flow velocity shaft 12, a flow velocity baffle 3, a tension spring 25, a tension spring connecting rod 24, and an adjusting nut 23. The flow velocity shaft 12 is rotatably mounted on the bracket 10. The flow velocity baffle 3 is fixedly installed on the flow velocity shaft 12, and the oil flow pushes the flow velocity baffle 3 to rotate around the flow velocity shaft 12. One side of the tension spring 25 is connected to the top of the flow velocity baffle 3. The flow velocity baffle 3 is controlled by the tension spring 25 structure, which will not be affected by vibration and avoid false alarms. The tension spring connecting rod 24 is connected to the other side of the tension spring 25 and is also connected to the bracket 10. The adjusting nut 23 is located at the end of the tension spring connecting rod 24 away from the tension spring 25. The tension spring 25 is connected to the tension spring connecting rod 24 and is fixed by the adjusting nut 23.

[0027] The device also includes: a first magnet frame 17, a reed switch frame 16, and a reed switch 15. The first magnet frame 17 is located at the bottom of the flow rate baffle 3, and a magnet is installed inside the first magnet frame 17. The reed switch frame 16 is fixedly installed on the bottom side wall of the bracket 10. The reed switch 15 is located in the reed switch frame 16, and when the magnet inside the first magnet frame 17 approaches the reed switch 15, the reed switch 15 closes under the attraction of the magnet and sends a trip signal.

[0028] When a serious fault occurs in the transformer or on-load tap changer during operation, an oil surge will occur inside the transformer. The oil flow impacts the flow velocity baffle 3 of the gas relay. The flow velocity baffle 3 moves around the flow velocity axis 12. A magnet frame 17 is installed on the flow velocity baffle 3, and a magnet is installed inside the magnet frame 17. When the magnet inside the magnet frame 17 connects to the reed switch 15, the reed switch 15 closes under the attraction of the magnet and sends a trip signal. A flow velocity limiter 11 is set at the bracket 10. At the same time, the flow velocity limiter 11 holds the flow velocity baffle 3, keeping the flow velocity contact in a closed state.

[0029] In addition, this equipment also includes: a lower float shaft 19, a lower float swing arm 21, a lower float 20, a lower float magnet frame 18, a second fixing frame 14, and an oil loss contact 13. The lower float shaft 19 is rotatably mounted on the bottom of the bracket 10 in a horizontal direction; the lower float swing arm 21 is fixedly installed on the lower float shaft 19. Furthermore, the lower float 20 and the flow rate baffle 3 are kept at a sufficient distance to ensure that there is no interference between them; the lower float 20 is fixedly installed on the lower float swing arm 21, and the lower float 20 swings up and down with the oil level. The lower float 20 is fixed by the lower float swing arm 21, which makes it more stable and reliable. The lower float magnet frame 18 is installed on the side wall of the lower float swing arm 21, and a magnet is installed inside the lower float magnet frame 18. The magnet inside the lower float magnet frame 18 can protect the magnet inside. The second fixing frame 14 is fixedly installed on the bracket 10. The oil loss contact 13 is set on the second fixing frame 14, and when the magnet inside the lower float magnet frame 18 approaches the oil loss contact 13, the oil loss contact 13 closes under the attraction of the magnet.

[0030] When the transformer oil level drops due to oil leakage, the lower float 20 and lower float swing arm 21 sink around the lower float shaft 19, while the lower float magnet frame 18 rises. When the magnet inside the lower float magnet frame 18 approaches the oil loss contact 13, the oil loss contact 13 closes under the attraction of the magnet. The oil loss contact 13 is connected in parallel with the reed switch 15, and the gas relay will send a trip signal to indicate that the gas relay is in an abnormal state.

[0031] The flow rate baffle 3 has an oil guide hole 4 at its bottom end, allowing oil to flow through the oil guide hole 4; a flow stabilizer 22 is provided at the bracket 10 to ensure that the lower float 20 is not affected by the forward and reverse oil flow.

[0032] The device also includes: a lower housing, a vent valve, and a terminal block. The lower housing is fixedly installed between the transformer main connecting pipe and the oil conservator to connect the oil circuit. The lower housing is also connected to the upper housing 1 to seal the transformer oil inside the cavity. The vent valve is fixed to the outside of the upper housing 1. The terminal block passes through the upper housing 1 to connect the switching signal.

[0033] In addition, the gas relay for the transformer also includes an oil circuit partition plate, which is fixed in the middle of the bracket 10.

[0034] The gas relay for transformers also includes: a round magnet, a reed switch, a cold-pressed terminal, and an adjusting wire. The round magnet is fixed on a round magnet frame and is fixed on both sides of the upper float arm. The reed switch is wrapped with heat shrink tubing and fixed to both sides of the fixed bracket using tubing clamps. The fixing position and quantity vary depending on the model. The cold-pressed terminal is connected to the reed switch using a high-temperature wire and is soldered to the terminal block and fixed with bolts. One side of the adjusting wire is connected to the upper part of the flow baffle via a tension spring, and the other side is fixed to the flow divider plate in the middle of the fixed bracket via an adjusting nut.

[0035] During the operation of a transformer, the gas relay plays a crucial monitoring role. It has multiple monitoring and alarm mechanisms, the specific principles of which are as follows:

[0036] When gas accumulates inside the gas relay, a series of components work together: the upper float 26, the upper float swing arm 27, the magnet in the upper float magnet holder 28, the limit block 29, and the limit 30 will sink synchronously around the upper float shaft 7; when the magnet in the upper float magnet holder 28 approaches the corresponding volume contact 8, the volume contact 8 will close, and the limit block 29 will engage with the limit seat 30, keeping the volume contact 8 in a closed alarm state, thereby continuously reminding the operator that the gas relay is in an abnormal state;

[0037] If a transformer or on-load tap changer experiences a serious fault during operation, an oil surge will be generated inside the transformer. This surge will impact the flow rate baffle 3 of the gas relay, causing it to rotate around the flow rate axis 12. The magnet bracket 17 installed on the flow rate baffle 3 contains a magnet. When the magnet approaches the reed switch 15, the reed switch 15 will close under the attraction of the magnet, thereby sending a trip signal. At the same time, the flow rate limit switch 11 set at the bracket 10 will hold the flow rate baffle 3 to ensure that the flow rate contact remains closed, thus realizing a fault alarm.

[0038] When the transformer leaks oil, causing the oil level to drop, the lower float 20 and the lower float swing arm 21 will sink around the lower float shaft 19, while the lower float magnet frame 18 will rise. When the magnet inside the lower float magnet frame 18 approaches the oil loss contact 13, the oil loss contact 13 will close under the attraction of the magnet. Since the oil loss contact 13 is connected in parallel with the reed switch 15, the gas relay will send a trip signal to indicate that the gas relay is in an abnormal state.

[0039] The gas relay involved in this utility model has highly intelligent and reliable monitoring and alarm functions. In actual operation, it can keenly detect a variety of abnormal situations. When abnormal situations such as internal gas accumulation, oil flow surge, or oil leakage occur, it will issue alarm signals through different triggering mechanisms.

[0040] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0041] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0042] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0043] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0044] Unless otherwise stated, the term "multiple" means two or more.

[0045] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0046] The term "and / or" describes the relationship between objects, indicating that there can be three relationships. For example, A and / or B means: A or B, or A and B.

[0047] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A dual-float gas relay for a transformer, installed on the oil pipeline of the transformer's main coupling pipe, wherein oil flows within the oil pipeline, characterized in that: Also includes: Upper shell; A probe, wherein the probe is disposed below the upper housing; A bracket, the top end of which is connected to the bottom end of the upper housing; An upper float shaft is rotatably mounted on the bracket in a horizontal direction; Upper float swing arm, which is fixedly installed on the upper float shaft; An upper float, which is fixedly installed on the upper float swing arm; The upper float magnet frame is mounted on the upper float swing arm, and a magnet is provided inside the upper float magnet frame; A limiting block is provided in the middle of the upper float swing arm; A limiting seat, wherein the limiting seat is disposed on the bracket; A first fixing frame is disposed on the bracket; The volume contact is installed on the first fixed frame, and when the volume contact approaches the magnet in the upper float magnet frame, the volume contact closes, and at the same time the limiting block and the limiting seat are locked, and the volume contact remains in the alarm state. A lower limit position is provided on the bracket and is used to limit the upper float. A counterweight is located at the end of the upper float arm.

2. The dual-float gas relay for transformers according to claim 1, characterized in that: Also includes: A flow velocity shaft, which is rotatably mounted on the bracket; A flow velocity baffle, which is fixedly installed on the flow velocity shaft; A tension spring, one side of which is connected to the top of the flow velocity baffle; A tension spring connecting rod, which is connected to the other side of the tension spring and to the bracket; An adjusting nut is provided at the end of the tension spring connecting rod opposite to the tension spring.

3. A dual-float gas relay for a transformer according to claim 2, characterized in that: Also includes: A first magnet holder is disposed at the bottom end of the flow velocity baffle, and a magnet is disposed inside the first magnet holder; A reed switch frame, wherein the reed switch frame is fixedly installed on the bottom side wall of the bracket; A reed switch is provided in the reed switch holder, and when a magnet in the first magnet holder approaches the reed switch, the reed switch closes under the attraction of the magnet and sends a trip signal.

4. A dual-float gas relay for a transformer according to claim 1, characterized in that: A flow rate limiter is provided at the support.

5. A dual-float gas relay for a transformer according to claim 3, characterized in that: Also includes: A lower float shaft is rotatably mounted at the bottom end of the bracket in a horizontal direction; The lower float swing arm is fixedly installed on the lower float shaft; Lower float, which is fixedly installed on the lower float swing arm; The lower float magnet frame is installed on the side wall of the lower float swing arm, and a magnet is provided inside the lower float magnet frame; The second fixing frame is fixedly installed on the bracket; The oil-loss contact is located on the second fixed frame, and when the magnet in the lower float magnet frame approaches the oil-loss contact, the oil-loss contact closes under the attraction of the magnet.

6. A dual-float gas relay for a transformer according to claim 5, characterized in that: The oil loss contact is connected in parallel with the reed switch.

7. A dual-float gas relay for a transformer according to claim 2, characterized in that: The flow velocity baffle has an oil guide hole at its bottom end.

8. A dual-float gas relay for a transformer according to claim 5, characterized in that: A flow stabilizer is provided at the support to ensure that the lower float is not affected by the forward and reverse oil flow.

9. A dual-float gas relay for a transformer according to claim 1, characterized in that: Also includes: The lower housing is fixedly disposed between the transformer main connecting pipe and the oil conservator to connect the oil circuit, and the lower housing is connected to the upper housing to seal the transformer oil inside the cavity; A vent valve, which is fixed to the outside of the upper housing; A terminal block, which passes through the upper housing, is used to connect a switching signal.

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