A gas relay convenient to install

Abstract

The application provides a gas relay convenient to install, an oil passing cavity has an oil inlet and an oil outlet, a gas storage cavity is detachably arranged on the upper portion of the oil passing cavity through a communication pipe, the gas storage cavity is divided into a first cavity and a second cavity by a vertical partition plate, the first cavity is communicated with the oil passing cavity through the communication pipe, the first sensing mechanism for detecting the oil level in the first cavity is arranged on one side of the second cavity, the electric cavity is independently arranged with the oil passing cavity and the gas storage cavity, a baffle is rotatably arranged in the oil passing cavity, a plate magnet is arranged on the baffle, a plurality of first dry reed tubes are horizontally and spacedly arranged in the electric cavity, a magnetic transmission block is arranged between the adjacent two dry reed tubes, and a first transition magnet is arranged between the oil passing cavity and the electric cavity. The application is convenient to install, is suitable for various installation environments, can avoid insulation drop and carbon bridge formation, and when the dry reed tube is maintained, the transformer oil circuit does not need to be cut off, and the maintenance is convenient.

Description

Technical Field

[0001] This invention relates to a gas relay that is easy to install. Background Technology

[0002] Gas relays are important safety protection devices on oil-immersed transformers. They are installed on the connecting pipe between the transformer tank cover and the oil conservator. When a fault occurs inside the transformer and gas or oil flows, the relay connects the signal or trip circuit, causing relevant devices to issue alarm signals or disconnecting the transformer from the power grid, thus protecting the transformer.

[0003] Gas relays transmit fault signals based on the on / off state of a reed switch. In existing gas relays, the reed switch and baffle are located in the same space, meaning the reed switch is immersed in transformer oil during operation. This arrangement has the following drawbacks: First, the reed switch pins are exposed in the oil, making them prone to malfunction due to insulation degradation. Furthermore, carbon bridges easily form at the exposed pins, leading to insufficient creepage distance and even carbon bridge breakdown, affecting normal operation and posing a significant safety hazard to the transformer. This is especially true when gas relays are used for switching oil chambers in on-load tap changers. Regardless of whether the arc is extinguished in oil or vacuum, carbon is generated after switching. Light carbon entering the gas relay makes the electrical circuits, such as the glass-fusible contacts of the reed switch, more susceptible to contamination, causing malfunctions. Moreover, the reed switch immersed in oil must withstand ±0.1 MPa pressure, making it prone to breakage. Second, existing gas relays... The gas accumulation area and the oil flow area of ​​the gas relay are fixed, meaning the gas accumulation area must be located above the baffle. Therefore, when installing the gas relay, careful attention must be paid to their positional relationship. However, in actual use, the reserved installation space for the gas relay may not meet this requirement. This necessitates the use of other structures to assist installation or the replacement of the gas relay with one suitable for the available space, making installation very cumbersome. Furthermore, the turbulence in the gas accumulation area significantly affects the oil flow, thus impacting the gas relay's accuracy. Additionally, during reed switch maintenance, the transformer oil circuit must be disconnected to remove the gas relay, compromising the transformer's overall sealing and requiring complete reprocessing of the transformer oil – a major inconvenience. Finally, existing gas relays typically only have one reed switch, which may send incorrect signals in actual use, causing the gas relay to malfunction and potentially leading to more serious consequences. Summary of the Invention

[0004] This invention proposes an easy-to-install gas relay, which is convenient to install and adaptable to various installation environments. During use, the first reed switch is isolated from the oil, which can avoid insulation degradation and the formation of carbon bridges. Furthermore, when maintaining the reed switch, it is not necessary to disconnect the transformer oil circuit, making maintenance convenient.

[0005] This invention is achieved through the following technical solution:

[0006] An easy-to-install gas relay includes an oil passage chamber, an electrical chamber, a gas storage chamber, a connecting pipe, a baffle, a plate magnet, a first transition magnet, and multiple first reed switches. The oil passage chamber has an oil inlet and an oil outlet. The gas storage chamber is detachably mounted on the upper part of the oil passage chamber via the connecting pipe. The gas storage chamber is divided into a first chamber and a second chamber by a vertically arranged partition. The first chamber is connected to the oil passage chamber via the connecting pipe. A first sensing mechanism for detecting the oil level in the first chamber is provided on one side of the partition located in the second chamber. The electrical chamber is independently connected to both the oil passage chamber and the gas storage chamber. The device is arranged vertically, with a baffle rotatably mounted in the oil passage chamber, a plate magnet mounted on the baffle, and multiple first reed switches horizontally spaced in the electrical cavity. A magnetic transmission block is provided between each pair of adjacent reed switches. A first transition magnet is located between the oil passage chamber and the electrical cavity. The baffle rotates under the action of the oil flow, causing the plate magnet to move from the normal position to the fault position. When the plate magnet is in the fault position, the first transition magnet and the magnetic transmission block are magnetized, and the first reed switches are activated under the action of the magnetic transmission block. When the plate magnet is in the normal position, the magnetism of the first transition magnet and the magnetic transmission block disappears.

[0007] Furthermore, the oil passage cavity is formed by four sides forming a circle and top and bottom surfaces respectively located at the upper and lower ends of the four sides. The oil inlet and oil outlet are respectively located on two opposite sides, and the remaining two sides, top surface and bottom surface are all provided with the first connecting hole.

[0008] Furthermore, the two ends of the connecting pipe are connected to the oil passage chamber and the gas storage chamber respectively via flanges.

[0009] Furthermore, the first reed switch includes a glass tube with a sealed cavity, a fixed rod and a reed with one end both disposed in the sealed cavity, and the other end of the fixed rod and the reed extending out of the glass tube. The magnetic transmission block is disposed between two adjacent glass tubes, and its position corresponds to the reed disposed in the sealed cavity, so that when the magnetic transmission block is magnetic, the reed can be activated by magnetism.

[0010] Furthermore, the first sensing mechanism includes Hall level sensors disposed on one side of the partition located in the second chamber and corresponding to each liquid level mark point, with each Hall level sensor located within the second chamber.

[0011] Furthermore, the first sensing mechanism includes a second reed switch respectively disposed on one side of the partition located in the second chamber and corresponding to each liquid level mark point, a guide mechanism vertically disposed on one side of the partition located in the first chamber, a floating block disposed in the first chamber and movable up and down along the guide mechanism, and a liquid level magnet disposed in the floating block.

[0012] Furthermore, the gas storage chamber is provided with a sealable gas injection port.

[0013] Furthermore, both the first transition magnet and the magnetic transmission block are made of soft iron.

[0014] Furthermore, the electrical cavity is disposed on the bottom surface, and an arc-shaped track protruding towards the electrical cavity is disposed on one side of the bottom surface located in the oil passage cavity, and the fault location is the most protruding part of the arc-shaped track.

[0015] Furthermore, the floating block is a hollow capsule made of a material that can float on oil, and the liquid level magnet is disposed inside the hollow capsule.

[0016] The present invention has the following beneficial effects:

[0017] 1. When a transformer malfunctions, gas is generated. When the gas volume is small, it rises from the oil passage chamber to the gas storage chamber, causing the oil level in the gas storage chamber to drop. The first sensing mechanism can detect the oil level in the gas storage chamber and send a signal when the corresponding level is reached. However, when the malfunction is severe and the gas volume is large, the gas will no longer rise to the gas storage chamber. Instead, it will carry oil and form an oil flow that rushes out of the oil passage chamber rapidly. This will drive the baffle to rotate, causing the plate magnet to move from the normal position to the fault position. When the plate magnet is in the fault position, the first transition magnet becomes magnetic, and the first reed switch is affected by this magnetism and actuates. Because the electrical cavity is connected to the overcurrent... The gas relay cavity and the gas storage cavity are independent. The first reed switch, located in the electrical cavity, will never come into contact with oil, thus avoiding the insulation degradation, carbon bridge formation, and breakage of the first reed switch pins due to oil immersion, as seen in existing technologies. This ensures the sensitivity and lifespan of the first reed switch. The gas storage cavity is detachably located above the oil passage cavity via a connecting pipe. This allows for installation of the gas relay by first installing the oil passage cavity according to the specific installation environment, and then placing the gas storage cavity on the upper surface of the oil passage cavity via the connecting pipe. This ensures that the gas relay is suitable for various different safety applications. The installation environment is more convenient, operation is more efficient, and the gas storage chamber is divided into a first chamber and a second chamber by a partition. The first chamber is connected to the oil passage chamber through a connecting pipe, while the second chamber is equipped with a first sensing mechanism to detect the liquid level. It can be seen that the oil passage chamber and the first chamber connected to it have very few internal components, which reduces turbulence in the gas accumulation area, thus preventing turbulence from affecting the accuracy of the gas relay. All electrical components are located outside the oil passage chamber, ensuring that none of the electrical components come into contact with oil during operation. When maintenance of the reed switch is required, because the oil flow does not pass through the electrical chamber, there is no need for maintenance. To cut off the transformer oil circuit, only the electrical cavity needs to be opened, which is convenient for maintenance and avoids damaging the overall sealing of the transformer. In order to ensure the independence of the oil passage cavity and the electrical cavity, the distance between the first reed switch and the plate magnet is increased. This may cause the magnetism of the plate magnet to weaken by the time it reaches the first reed switch, thus causing the first reed switch to fail to operate normally. Therefore, a first transition magnet is set between the oil passage cavity and the electrical cavity. After the plate magnet is in the fault position, the first transition magnet is magnetized by the plate magnet and becomes magnetic. This magnetism ensures that the first reed switch can operate in time, thereby ensuring the normal use of the gas relay.To avoid malfunctions, multiple first reed switches are horizontally spaced within the electrical cavity. By simultaneously activating these reed switches, multiple signals are emitted at once. The receiving end uses these signals to determine whether the gas relay has activated. Compared to existing technologies that rely on a single signal, this significantly reduces the probability of malfunctions. Because the first reed switches are horizontally spaced, and due to the magnetic reluctance of air, magnetism weakens with distance. The farther a reed is from the first transition magnet, the weaker the magnetic influence. Therefore, this invention includes a magnetic transmission block between adjacent reed switches. This block can be magnetized by the first transition magnet or an adjacent magnetic transmission block, ensuring simultaneous activation of all reed switches. However, in practice, the magnetic transmission block represents a series connection of magnetic circuits. The farther the magnetic transmission block is, the longer it takes to acquire magnetism. Therefore, the farther the reed is, the longer it will delay activation. This is applicable to specific situations. Of course, if the delay is very short, the reed switches can be considered to activate simultaneously.

[0018] 2. The gas storage chamber is equipped with a sealable gas injection port, which can be used to inject clean gas (such as 99.999% nitrogen or dry air) into the gas storage chamber to enable the gas storage chamber capacity to be checked without power interruption or disassembly of the gas relay, and to observe whether the gas relay is working properly.

[0019] 3. An arc-shaped track protruding into the electrical cavity is provided on one side of the bottom surface located in the oil passage cavity. The fault location is at the most protruding part of the arc-shaped track, that is, the thinnest part of the bottom surface. This not only restricts the movement trajectory of the plate magnet, but also further ensures that the reed switch can operate normally and in a timely manner. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] Figure 1-1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0022] Figure 1-2 This is a cross-sectional view of the plate magnet in the normal position according to an embodiment of the present invention.

[0023] Figure 1-3 This is a cross-sectional view of the structure of a plate magnet in a fault location according to an embodiment of the present invention.

[0024] Figure 1-4 This is a schematic diagram of the structure of each first reed switch and magnetic transmission block in Embodiment 1 of the present invention.

[0025] Figure 1-5 for Figure 1-2 Enlarged view of section A.

[0026] Figure 2-1 This is a cross-sectional view of the plate magnet in the normal position according to Embodiment 2 of the present invention.

[0027] Figure 2-2 for Figure 2-1 Enlarged view of section B.

[0028] Figure 2-3 This is a schematic diagram of the guide plate in Embodiment 2 of the present invention.

[0029] Figure 2-4 for Figure 2-3 A top-view structural diagram.

[0030] Figure 3 This is a cross-sectional view of the three-plate magnet in the normal position according to an embodiment of the present invention.

[0031] Among them, 1. Oil passage cavity; 11. Oil inlet; 12. Oil outlet; 13. Side; 14. Top surface; 15. Bottom surface; 16. Arc-shaped track; 17. Support; 18. Rotating shaft; 19. First inclined plate; 110. First connecting hole; 111. First extension tube; 2. Electrical cavity; 3. Gas storage cavity; 31. Partition; 32. First chamber; 33. Second chamber; 34. Gas injection port; 35. Second connecting hole; 36. Second... 4. Extension tube; 51. Connecting tube; 52. Oil flow plate; 53. First inclined plate; 6. Plate magnet; 7. First transition magnet; 8. First reed switch; 81. Glass tube; 82. Fixing rod; 83. Reed; 9. Magnetic transmission block; 101. Hall level sensor; 102. Second reed switch; 103. Floating block; 104. Level magnet; 105. Guide plate; 106. L-shaped plate; 107. Buffer pad; 108. Flange.

[0032] The arrows in the diagram indicate the direction of oil flow. Detailed Implementation

[0033] Example 1:

[0034] like Figures 1-1 to 1-5As shown, the gas relay for easy installation includes an oil passage chamber 1, an electrical chamber 2, a gas storage chamber 3, a connecting pipe 4, a baffle, a plate magnet 6, a first transition magnet 7, and three first reed switches 8. The oil passage chamber 1 is formed by four side surfaces 13 forming a circle and a top surface 14 and a bottom surface 15 respectively located at the upper and lower ends of the four side surfaces 13. The oil inlet 11 and the oil outlet 12 are respectively located on two opposite side surfaces 13. The top surface 14, the bottom surface 15, and the remaining two side surfaces 13 are all provided with a first connecting hole 110 that can be closed. The first connecting hole 110 on each side is close to the oil outlet 12. Each first connecting hole 110 is provided with a first extension pipe 111 extending outward and perpendicular to the corresponding surface. The bottom of the gas storage chamber 3 is provided with a sealable second connecting hole 35, and a downwardly extending second extension pipe 36 is also provided on the second connecting hole 35. The gas storage chamber 3 is connected to the oil passage chamber 1 through the cooperation of the connecting pipe 4 with the first connecting hole 110 and the second connecting hole 35, and is located above the oil passage chamber 1. More specifically, the two ends of the connecting pipe 4 are connected to the first extension pipe 111 and the second extension pipe 36 through flanges 108, respectively. In other embodiments, the connection between the connecting pipe 4 and the oil passage chamber 1 and the gas storage chamber 3 can also be achieved through other structures. For the first extension pipe 111 that is not connected to the connecting pipe 4, it is sealed with a sealing plate, and the connection between the sealing plate and the first extension pipe 111 can also be achieved through flanges.

[0035] The electrical cavity 2 and the oil passage cavity 1 are arranged independently. The upper end of the baffle is rotatably mounted in the oil passage cavity 1, and the plate magnet 6 is mounted at the lower end of the baffle. Three first reed switches 8 are horizontally spaced in the electrical cavity 2. Specifically, each first reed switch 8 includes a glass tube 81 with a sealed cavity, a fixed rod 82 and a reed 83 with one end both located in the sealed cavity, and the other end of the fixed rod 82 and the reed 83 extends out of the glass tube 81 to form a lead. A magnetic transmission block 9 is provided between each pair of adjacent glass tubes 81, and its position corresponds to the reed 83 located in the sealed cavity, so that when the magnetic transmission block 9 is magnetic, the reed 83 can be activated by magnetism. The first transition magnet 7 is set... Between the oil passage 1 and the electrical passage 2, near the fault position and corresponding to the position of the magnetic transmission block 9, the baffle rotates under the action of the oil flow, causing the plate magnet 6 to move from the normal position to the fault position. When the plate magnet 6 is in the fault position, the first transition magnet 7 is magnetized by the plate magnet 6 and becomes magnetic. In this embodiment, the first transition magnet 7 is located above the outermost magnetic transmission block 9, which is magnetized by the first transition magnet 7. The remaining magnetic transmission blocks 9 are then magnetized sequentially by the first transition magnet 7 and / or adjacent magnetic transmission blocks 9, thereby causing all the first reed switches 8 to operate. When the plate magnet 6 is in the normal position, the magnetism of the first transition magnet 7 disappears, and the magnetism of each magnetic transmission block 9 also disappears. The plate magnet 6 is a cuboid magnet of sufficient length to ensure that the first transition magnet 7 can be magnetized, thereby ensuring the normal operation of the first reed switches 8.

[0036] A bracket 17 is provided inside the oil passage 1. The bracket 17 consists of two spaced-apart plates. The upper end of the plate is located on the top surface 14. The baffle includes an oil flow plate 51 that withstands the impact of the oil flow and a first inclined plate 52 52 52 19 located at the lower end of the oil flow plate 51. The plate magnet 6 is located at the rear end of the first inclined plate 52 52 19. The rotating mechanism includes a rotating shaft 18 located on the two plates and two second inclined plates located on the upper ends of both sides of the oil flow plate 51 and extending backward. The two second inclined plates are rotatably mounted on the rotating shaft 18. The lower end of the baffle is inclined towards the oil inlet 11. The normal position is close to the oil inlet 11, and the fault position is far away from the oil inlet 11. The specific installation structure of the rotating shaft 18 is the prior art.

[0037] The gas storage chamber 3 is divided into a first chamber 32 and a second chamber 33 by a vertically arranged partition 31. The first chamber 32 is connected to the oil passage chamber 1 through a connecting pipe 4. A sealable gas injection port 34 is provided at the top of the first chamber 32. The specific sealing structure is existing technology. Multiple liquid level markers are vertically spaced on one side of the partition 31 located in the second chamber 33. A Hall level sensor 101 is provided on the partition 31 corresponding to each liquid level marker. Each Hall level sensor 101 is located in the second chamber 33. The Hall level sensor 101 is used to detect the liquid level in the second chamber 33. When the liquid level changes to a certain liquid level marker, the corresponding Hall level sensor 101 will send a signal. The Hall level sensor 101 can be installed on the partition 31 by means of adhesive or other methods.

[0038] In this embodiment, both the first transition magnet 7 and the magnetic transmission block 9 are made of soft iron.

[0039] Example 2:

[0040] like Figures 2-1 to 2-4 As shown, the difference between this embodiment and Embodiment 1 is that:

[0041] The gas storage chamber 3 is divided into a first chamber 32 and a second chamber 33 by a vertically arranged partition 31. The first chamber 32 is connected to the oil passage chamber 1 through a connecting pipe 4. The top of the first chamber 32 is provided with a sealable gas injection port 34. The specific sealing structure is existing technology. Multiple liquid level markers are vertically spaced on one side of the partition 31 located in the second chamber 33. A second reed switch 102 is provided on the partition 31 corresponding to each liquid level marker. Each second reed switch 102 is located in the second chamber 33. A vertically arranged guide mechanism is provided on one side of the partition 31 located in the first chamber 32. A float block 103 is provided in the first chamber 32. Specifically, the float block 103 is a hollow capsule made of a material that can float on transformer oil. A cylindrical liquid level magnet 104 is provided inside the hollow capsule. When the liquid level of the oil in the first chamber 32 changes, the float block can move up and down along the guide mechanism. In this embodiment, the guiding mechanism includes a guide plate 105 vertically mounted on the partition 31 and two L-shaped plates 106 respectively mounted on both sides of the guide plate 105. A gap exists between the two L-shaped plates 106. The hollow capsule is horizontally positioned between the two L-shaped plates 106, and its ends are restricted by the two L-shaped plates 106, allowing it to move only up and down along the vertical track formed by the guide plate 105 and the two L-shaped plates 106. This prevents the liquid level magnet 104 from moving away from the second reed switch 102, thus avoiding malfunction. The second chamber 32 is equipped with a buffer pad 107, the position of which corresponds to the track position, to prevent the float block 103 from colliding with the top of the second chamber 32 and being damaged when the transformer vibrates. The float block 103 floats on the oil surface and changes position according to the oil level. When the liquid level changes to a certain level marker, the liquid level magnet 104 activates the corresponding second reed switch 102, thereby sending a signal. In this embodiment, the hollow capsule is made of oil-resistant foam material. The specific mounting structure of the second reed switch 102 is existing technology.

[0042] The other contents of this embodiment are the same as those of Embodiment 1, and will not be repeated here.

[0043] Example 3:

[0044] like Figure 3 As shown, the difference between this embodiment and Embodiment 1 is that:

[0045] The electrical cavity 2 is located on the bottom surface 15, which is made of a plate material that magnetic signals can penetrate, such as aluminum alloy. An arc-shaped track 16 protruding towards the electrical cavity 2 is provided on one side of the bottom surface 15, located on the side of the oil passage cavity 1. The fault location is at the most protruding point of the arc-shaped track 16. The first transition magnet 7 is also located at this most protruding point and can be arranged by means of bonding or other methods. In this embodiment, due to the arc-shaped track, the oil flow plate 51 of the baffle is longer, allowing the plate magnet 6 to move within the arc-shaped track 16.

[0046] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent application and the contents of the specification of the present invention should still fall within the scope of the patent of the present invention.

Claims

1. A gas relay that is easy to install, characterized in that: It includes an oil passage chamber, an electrical chamber, an air storage chamber, a connecting pipe, a baffle, a plate magnet, a first transition magnet, and multiple first reed switches. The oil passage chamber has an oil inlet and an oil outlet. The air storage chamber is detachably installed above the oil passage chamber via the connecting pipe. The air storage chamber is divided into a first chamber and a second chamber by a vertically arranged partition. The first chamber is connected to the oil passage chamber via the connecting pipe. A first sensing mechanism for detecting the oil level in the first chamber is provided on one side of the partition located in the second chamber. The electrical chamber is arranged independently from the oil passage chamber and the air storage chamber. The baffle is rotatably installed in the oil passage chamber, and the plate magnet is installed on the baffle. Multiple first reed switches are horizontally spaced in the electrical chamber. Each chamber is equipped with a magnetic transmission block. The first transition magnet is located between the oil passage chamber and the electrical chamber. The baffle rotates under the action of the oil flow, causing the plate magnet to move from the normal position to the fault position. When the plate magnet is in the fault position, the first transition magnet and the magnetic transmission block are magnetized, and the first reed switch is activated under the action of the magnetic transmission block. When the plate magnet is in the normal position, the magnetism of the first transition magnet and the magnetic transmission block disappears. The oil passage chamber is formed by four sides forming a circle and top and bottom surfaces respectively located at the upper and lower ends of the four sides. The electrical chamber is located on the bottom surface. An arc-shaped track protruding towards the electrical chamber is provided on one side of the bottom surface located in the oil passage chamber. The fault position is the most protruding part of the arc-shaped track.

2. The gas relay for easy installation according to claim 1, characterized in that: The oil inlet and oil outlet are respectively located on two opposite sides, and the remaining two sides, top surface and bottom surface are each provided with a first connecting hole.

3. The gas relay for easy installation according to claim 1, characterized in that: The two ends of the connecting pipe are connected to the oil passage chamber and the gas storage chamber respectively via flanges.

4. A gas relay that is easy to install according to claim 1, 2, or 3, characterized in that: The first reed switch includes a glass tube with a sealed cavity, a fixed rod and a reed with one end both disposed in the sealed cavity, and the other end of the fixed rod and the reed extending out of the glass tube. The magnetic transmission block is disposed between two adjacent glass tubes, and its position corresponds to the reed disposed in the sealed cavity, so that when the magnetic transmission block is magnetic, the reed can be activated by the magnetism.

5. A gas relay that is easy to install according to claim 1, 2, or 3, characterized in that: The first sensing mechanism includes Hall level sensors disposed on one side of the partition located in the second chamber and corresponding to each liquid level mark point, and each Hall level sensor is located in the second chamber.

6. A gas relay for easy installation according to claim 1, 2, or 3, characterized in that: The first sensing mechanism includes a second reed switch respectively disposed on one side of the partition located in the second chamber and corresponding to each liquid level mark point, a guide mechanism vertically disposed on one side of the partition located in the first chamber, a floating block disposed in the first chamber and movable up and down along the guide mechanism, and a liquid level magnet disposed in the floating block.

7. A gas relay for easy installation according to claim 1, 2, or 3, characterized in that: The gas storage chamber has a sealable gas injection port.

8. A gas relay for easy installation according to claim 1, 2, or 3, characterized in that: Both the first transition magnet and the magnetic transport block are made of soft iron.

9. A gas relay for easy installation according to claim 6, characterized in that: The floating block is a hollow capsule made of a material that can float on oil, and the liquid level magnet is disposed inside the hollow capsule.

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