Gas relays based on flow rate tripping

Abstract

The present invention provides a gas relay based on flow rate tripping. When a serious fault occurs in a transformer, the transformer oil surges. Since the arc length of the arc-shaped shell is greater than the straight-line length of the elastic wave plate, the oil flow velocity on the upper surface of the flow rate switch structure is greater than the oil flow velocity on its lower surface. According to Bernoulli's principle, the oil flow pressure on the upper surface of the flow rate switch structure is less than the oil flow pressure on its lower surface. The oil flow pressure difference between the upper and lower surfaces of the flow rate switch structure causes the elastic wave plate to deform upward, driving the linear displacement component to move upward to trigger the alarm switch action, sending a trip signal, and shutting down the transformer. The flow rate switch structure does not rely on the preload force of a spring or a magnet, but directly drives the elastic wave plate to deform through the oil flow pressure difference, thereby driving the linear displacement component to move upward to trigger the alarm switch action, avoiding the problem caused by preload force drift, and improving the measurement accuracy and reliability of the gas relay in heavy gas signals.

Description

Technical Field

[0001] The invention relates to the technical field of transformer protection, in particular to a gas relay based on flow rate tripping. Background Art

[0002] Transformers are crucial equipment in power systems, and their safe and stable operation is directly related to the reliability and stability of the power grid. A gas relay (also known as a gas relay) is a protective device used on transformers. Installed in the pipeline between the transformer's oil conservator and oil tank, it activates contacts when an internal transformer fault causes oil decomposition to produce gas or oil flow surges, connecting the designated control circuit and promptly issuing an alarm signal (for minor gas faults) or activating protective elements to automatically disconnect the transformer (for major gas faults), effectively preventing the fault from escalating and ensuring the safety of personnel and equipment.

[0003] Gas relays are the primary protection device for internal transformer faults. Their importance goes without saying, placing stringent demands on their reliability and accuracy. A severe gas tripping event often accompanies a major fault and can even threaten the lives of personnel. When a severe transformer fault occurs, such as a turn-to-turn short circuit or insulation damage, the transformer oil rapidly decomposes, producing large amounts of gas accompanied by a strong surge of oil. At this point, the gas relay must accurately sense this change and immediately activate the severe gas tripping mechanism, disconnecting the faulty transformer from the grid and preventing further damage. Consequently, the gas relay's severe gas tripping mechanism is subject to extremely high requirements for stability, reliability, and precision.

[0004] There are two main types of heavy gas tripping structures currently used in the market: one is a spring-driven oil flow baffle structure, and the other is a magnet-attracted oil flow baffle structure. Both solutions provide a certain preload force to the oil flow baffle. When the oil flow impact force exceeds the preset preload force, the oil flow baffle rotates and contacts the reed switch to generate a heavy gas tripping signal. At the same time, the baffle is reset by the spring tension and the magnet attraction respectively. However, both solutions have the following problems:

[0005] (1) Both spring-type and magnetic-type preloads experience drift over time and due to vibration. Spring-type preloads can experience changes in elasticity due to factors such as material fatigue and temperature changes, thus affecting their stability. Magnetic-type preloads can experience changes in adsorption force due to weakening magnetism or positional shifts. This drift in preload will directly affect the accuracy and reliability of the oil flow baffle triggering tripping, reducing the response speed and accuracy of the protective device.

[0006] (2) The oil flow baffle trigger mechanism is highly sensitive to the laminar flow state of the liquid. In actual operation, the flow state of the transformer oil may be affected by a variety of factors, such as pipeline vibration, changes in pipe diameter, and changes in liquid physical properties. These factors will cause the laminar flow state of the oil flow to change, thereby affecting the impact force of the oil flow on the baffle. Once the impact force deviates from the preset trip calibration value, it will trigger a false operation or refusal to operate, reducing the reliability and stability of the protection device. Summary of the Invention

[0007] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a gas relay based on flow rate tripping, which is used to solve the technical problems of insufficient accuracy, insufficient stability, and low measurement accuracy of gas relays in the prior art in terms of heavy gas tripping.

[0008] To achieve the above-mentioned object, the present invention provides a gas relay based on flow rate tripping, which is used to be installed on a transformer, comprising: a relay housing, a fixed bracket structure and a flow rate switch structure; the relay housing is provided with an inner cavity for accommodating transformer oil, and the fixed bracket structure is arranged in the inner cavity; the fixed bracket structure includes a switch bracket and an alarm switch arranged on the switch bracket; the flow rate switch structure includes an upwardly convex arc housing, a linear displacement component and an elastic wave plate arranged at the bottom of the arc housing, and a closed cavity is formed between the arc housing and the elastic wave plate; the arc housing is fixed on the switch bracket; the top of the arc housing is provided with a A through hole is provided, one end of the linear displacement component passes through the through hole and is connected to the elastic wave plate, and the other end is used to trigger the alarm switch; when a serious fault occurs in the transformer, the transformer oil in the inner cavity surges, and since the arc length of the arc shell is greater than the straight length of the elastic wave plate, the oil flow velocity on the upper surface of the flow rate switch structure is greater than the oil flow velocity on its lower surface. According to Bernoulli's principle, the oil flow pressure on the upper surface of the flow rate switch structure is less than the oil flow pressure on its lower surface. The oil flow pressure difference between the upper and lower surfaces of the flow rate switch structure causes the elastic wave plate to deform upward, driving the linear displacement component to move upward to trigger the alarm switch action.

[0009] As a more preferred embodiment, the linear displacement assembly includes a guide cylinder structure and a linear drive rod. The guide cylinder structure is arranged in a through hole. The guide cylinder structure is a limiting hole that passes through the upper and lower parts. The limiting hole is adapted to the outer contour of the linear drive rod. One end of the linear drive rod passes through the limiting hole and is connected to the elastic wave plate.

[0010] As a more preferred embodiment, the linear displacement assembly further includes a sealing ring, which is disposed in the limiting hole.

[0011] As a more preferred embodiment, the linear displacement assembly further includes a spring, which is sleeved on the linear drive rod, and one end of the spring is connected to the elastic wave plate, and the other end is connected to the bottom of the guide cylinder structure.

[0012] As a more preferred embodiment, the alarm switch includes a micro switch.

[0013] As a more preferred embodiment, a trigger plate for triggering the micro switch is provided at the other end of the linear drive rod, and the linear drive rod can drive the trigger plate to move.

[0014] As a more preferred embodiment, a magnetic piece is provided at the other end of the linear drive rod, and the alarm switch includes a reed switch. The linear drive rod can drive the magnetic piece to move and trigger the reed switch.

[0015] As a more preferred embodiment, a partition is further included, and the partition is arranged on the switch bracket.

[0016] As described above, the gas relay based on flow rate tripping according to the present invention has the following beneficial effects: when a serious fault occurs in the transformer, the transformer oil in the inner cavity surges. Because the arc length of the arc-shaped housing is greater than the linear length of the elastic wave plate, the oil flow velocity on the upper surface of the flow rate switch structure is greater than the oil flow velocity on its lower surface. According to Bernoulli's principle, the oil flow pressure on the upper surface of the flow rate switch structure is less than the oil flow pressure on the lower surface. The oil flow pressure difference between the upper and lower surfaces of the flow rate switch structure causes the elastic wave plate to deform upward, driving the linear displacement assembly to move upward, triggering the alarm switch to actuate, issuing a trip signal, shutting down the transformer, ceasing the oil flow within the transformer, and resetting the linear displacement assembly under the action of gravity. The flow rate switch structure does not rely on the preload force of a spring or magnet, but instead directly drives the deformation of the elastic wave plate through the oil flow pressure difference, thereby driving the linear displacement assembly to move upward, triggering the alarm switch to actuate. This avoids the problems caused by preload force drift, improves the response speed and accuracy of the protection device, and improves the measurement accuracy and reliability of the gas relay for heavy gas signals. Furthermore, the flow rate switch triggers the alarm based on the oil pressure differential between its upper and lower surfaces. This mechanism is less dependent on the specific laminar flow state of the oil flow. As long as the oil flow rate reaches the set value, the resulting oil pressure differential will accurately trigger the alarm switch, improving the system's anti-interference ability and accuracy. The linear displacement assembly naturally resets under the action of gravity, eliminating the need for an additional reset mechanism, simplifying the system structure and reducing maintenance costs.

[0017] In addition, the gas relay based on flow rate tripping in the present invention has the advantages of high precision, high stability, modularity and small size. It can not only improve the measurement accuracy and stability of existing gas relay products in heavy gas signals, but also the flow rate switch structure has the advantages of small size, simple and compact structure, strong impact resistance, low cost, simple manufacturing process, etc. after modular design. It is very suitable for mass production of production enterprises, can better protect the production of oil-immersed transformers, and has considerable economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a schematic structural diagram of a gas relay based on flow rate tripping in the present invention.

[0019] Figure 2 It is a schematic diagram showing the principle of a spring-driven oil flow baffle structure in the prior art.

[0020] Figure 3 It shows a schematic diagram of the principle of a magnet adsorbing oil flow baffle structure in the prior art.

[0021] Figure 4 Shown is a schematic diagram of the flow rate switch structure of the present invention.

[0022] Figure 5 Shown is a schematic diagram of the principle of the flow rate switch structure in the present invention.

[0023] Figure 6 Shown is an exploded view of the flow rate switch structure of the present invention.

[0024] Figure 7 Shown is a partial structural schematic diagram of a gas relay based on flow rate tripping in the present invention.

[0025] Component number description

[0026] 1 Relay housing

[0027] 11 Inner cavity

[0028] 2 Fixed bracket structure

[0029] 21 Switch bracket

[0030] 22 Alarm switch

[0031] 3 Flow rate switch structure

[0032] 31 curved shell

[0033] 32 linear displacement components

[0034] 321 guide tube structure

[0035] 3211 First guide cylinder

[0036] 3212 Second guide cylinder

[0037] 3212a Stop surface

[0038] 322 linear drive rod

[0039] 323 sealing ring

[0040] 324 Spring

[0041] 33 Elastic Wave Plate

[0042] 34 Sealed cavity

[0043] 4 partitions DETAILED DESCRIPTION

[0044] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0045] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no technical substantive significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. The following detailed description should not be considered restrictive, and the scope of the embodiments of this application is only limited by the claims of the published patents. The terms used here are only for describing specific embodiments and are not intended to limit this application. Spatial-related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., may be used in the text to facilitate the description of the relationship between an element or feature shown in the figure and another element or feature.

[0046] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," "fixed," and "holding" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0047] Furthermore, as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". Exceptions to this definition occur only when the combination of elements, functions, or operations is inherently mutually exclusive in some way.

[0048] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the following embodiments and the accompanying drawings are used to further describe the technical solutions in the embodiments of the present invention. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0049] like Figure 1 、 4 -7, the present invention provides a gas relay based on flow rate tripping, which is used to be installed on a transformer. The gas relay includes: a relay housing 1, a fixing bracket structure 2 and a flow rate switch structure 3;

[0050] The relay housing 1 is provided with an inner cavity 11 for containing transformer oil, and the fixing bracket structure 2 is provided in the inner cavity 11;

[0051] The fixed support structure 2 includes a switch support 21 and an alarm switch 22 provided on the switch support 21;

[0052] The flow rate switch structure 3 includes an upwardly protruding arcuate housing 31, a linear displacement assembly 32, and an elastic wave plate 33 disposed at the bottom of the arcuate housing 31. A sealed cavity 34 is formed between the arcuate housing 31 and the elastic wave plate 33. The arcuate housing 31 is fixed to the switch bracket 21. A through hole is provided at the top of the arcuate housing 31. One end of the linear displacement assembly 32 passes through the through hole and connects to the elastic wave plate 33. The other end is used to trigger the alarm switch 22.

[0053] When a serious fault occurs in the transformer, the transformer oil in the inner cavity 11 surges. Since the arc length of the arc-shaped shell 31 is greater than the straight length of the elastic wave plate 33, the oil flow velocity on the upper surface of the flow rate switch structure 3 is greater than the oil flow velocity on its lower surface. According to Bernoulli's principle, the oil flow pressure on the upper surface of the flow rate switch structure 3 is less than the oil flow pressure on its lower surface. The oil flow pressure difference between the upper and lower surfaces of the flow rate switch structure 3 causes the elastic wave plate 33 to deform upward, driving the linear displacement component 32 to move upward, triggering the alarm switch 22 to operate.

[0054] The heavy gas trip structures used in the prior art are mainly spring-pull oil flow baffle structures and magnet-absorb oil flow baffle structures, such as Figure 2-3 As shown, in the initial state, the baffle is positioned vertically in the oil circuit. When transformer oil at a certain velocity flows into the baffle, the baffle's resistance reduces the flow rate to zero. According to the law of momentum, the oil flow at this time exerts a certain pressure on the baffle. When this pressure exceeds the tension of the spring or the suction of the reset magnet, the baffle rotates in the direction of the oil flow, and the corresponding switch magnet on the baffle rotates to the reed switch position, connecting the reed switch. When a trip signal is issued, a shutdown is typically determined, at which point the transformer shuts down, the oil flow within the transformer stops, and the baffle resets due to the tension of the spring and the suction of the reset magnet.

[0055] However, after prolonged use, the spring's elastic modulus changes due to factors such as material fatigue and temperature fluctuations, causing the tension to decrease. This, in turn, reduces the corresponding spring preload, causing the oil flow impact force that causes the baffle to rotate to deviate from the preset tripping calibration value. Similarly, after prolonged use, magnets can lose their magnetic properties or shift in position, causing their adsorption force to change, thus affecting the accuracy and reliability of the oil flow baffle's tripping. Furthermore, due to the viscosity of transformer oil, a significant decrease in preload can prevent the baffle from resetting.

[0056] In addition, when the oil flow baffle structure is preset at the factory with a flow rate setting value, it usually relies on standard pipes and flow meters to calibrate the preload force corresponding to the oil flow rate. If there is an error in the on-site pipeline diameter, or there is vibration fluctuation when the transformer oil flows, or the viscosity coefficient of the transformer oil changes, it will affect the laminar flow state of the oil flow, especially the laminar flow state at the edge of the pipe, and then affect the impact force of the oil flow on the baffle, resulting in the opening and closing flow rate of the baffle being inconsistent with the factory setting. Once the impact force deviates from the preset trip calibration value, it will trigger a false operation or refusal to operate, reducing the reliability and stability of the protection device.

[0057] In the gas relay based on flow rate tripping of the present invention, when a serious fault occurs in the transformer, the transformer oil in the inner cavity 11 surges. Since the arc length of the arc-shaped shell 31 is greater than the straight length of the elastic wave plate 33, the oil flow velocity on the upper surface of the flow rate switch structure 3 is greater than the oil flow velocity on its lower surface. According to Bernoulli's principle, the oil flow pressure on the upper surface of the flow rate switch structure 3 is less than the oil flow pressure on its lower surface. The oil flow pressure difference between the upper and lower surfaces of the flow rate switch structure 3 causes the elastic wave plate 33 to deform upward, driving the linear displacement group The upward movement of component 32 triggers the alarm switch 22 to operate, issuing a trip signal, shutting down the transformer and ceasing the oil flow inside the transformer. The linear displacement component 32 resets under the action of gravity. The flow rate switch structure 3 does not rely on the preload of a spring or magnet, but instead directly drives the elastic wave plate 33 to deform through the oil flow pressure difference, thereby driving the linear displacement component 32 to move upward and trigger the alarm switch 22 to operate. This avoids the problems caused by preload drift, improves the response speed and accuracy of the protection device, and improves the measurement accuracy and reliability of the gas relay in terms of heavy gas signals. Furthermore, the flow rate switch structure 3 triggers the alarm based on the oil flow pressure difference between its upper and lower surfaces. It is less dependent on the specific laminar flow state of the oil flow. As long as the oil flow velocity reaches the set value, the resulting oil flow pressure difference can accurately trigger the alarm switch 22, improving the system's anti-interference ability and accuracy. The linear displacement component 32 naturally resets under the action of gravity, eliminating the need for an additional reset mechanism, simplifying the system structure and reducing maintenance costs.

[0058] It is worth noting that the gas relay based on flow rate tripping in the present invention has the advantages of high precision, high stability, modularity and small size. Not only can it improve the measurement accuracy and stability of existing gas relay products in terms of heavy gas signals, but the flow rate switch structure 3 has the advantages of small size, simple and compact structure, strong impact resistance, low cost, simple manufacturing process, etc. after modular design. It is very suitable for mass production of production enterprises and replaces the existing low-precision heavy gas tripping system on the market. It can better escort the production work of oil-immersed transformers and has considerable economic benefits. Therefore, the gas relay based on flow rate tripping in the present invention can fundamentally solve the defects of insufficient accuracy and insufficient stability of the heavy gas tripping system, greatly reduce the possibility of false alarms of heavy gas, and its structural system is also very suitable for digital upgrades.

[0059] In this embodiment, if Figure 4-7As shown, the linear displacement assembly 32 includes a guide cylinder structure 321 and a linear drive rod 322. The guide cylinder structure 321 is disposed in the through hole. The guide cylinder structure 321 is a vertically extending stopper hole that matches the outer contour of the linear drive rod 322. One end of the linear drive rod 322 passes through the stopper hole and connects to the elastic wave plate 33. As a result, when the elastic wave plate 33 deforms upward, the linear drive rod 322 moves upward within the stopper hole, triggering the alarm switch 22.

[0060] In this embodiment, the Bernoulli principle describes the physical phenomenon of energy conservation when a fluid moves along a streamline. Specifically, it reveals the relationship between a fluid's kinetic energy, gravitational potential energy, and pressure potential energy. When a fluid flows through a pipe or other container, areas with higher velocity experience lower pressure, while areas with lower velocity experience higher pressure. This is the most famous corollary of the Bernoulli principle.

[0061] Among them, the mathematical expression of Bernoulli's principle is:

[0062]

[0063] Where P represents the static pressure of the fluid; ρ represents the density of the fluid; v represents the velocity of the fluid; g represents the acceleration due to gravity; h represents the height of the fluid; and C represents a constant.

[0064] In this embodiment, if Figure 5 As shown, the arc length of the arc shell 31 is S, and the straight length of the elastic wave plate 33 is L. When a serious fault occurs in the transformer, the transformer oil in the inner cavity 11 surges. When the oil flow rate gradually increases and reaches the preset flow rate setting value, since S>L, the oil flow rate V of the transformer oil flowing through the surface of the arc shell 31 is S Greater than the oil flow velocity V of the transformer oil flowing through the surface of the elastic wave plate 33 L According to formula (1), the oil flow pressure P on the surface of the arc-shaped housing 31 is S Less than the oil flow pressure P on the surface of the elastic wave plate 33 L As a result, there is an oil pressure difference between the upper and lower surfaces of the flow rate switch structure 3. The oil pressure difference pushes the elastic wave plate 33 upward, causing deformation, and then drives the linear drive rod 322 to move upward, causing a displacement X, triggering the alarm switch 22 to actuate and send a trip signal, shutting down the transformer and cutting off the transformer from the power grid, thereby protecting the transformer.

[0065] In this embodiment, if Figure 4-6As shown, the linear displacement assembly 32 also includes a sealing ring 323, which is disposed in the limiting hole. One end of the linear drive rod 322 passes through the sealing ring 323 in the limiting hole and connects to the elastic wave plate 33. This improves the sealing performance of the sealed cavity 34 formed between the arc-shaped housing 31 and the elastic wave plate 33, ensuring that when an oil pressure difference exists between the upper and lower surfaces of the flow rate switch structure 3, the linear drive rod 322 can be accurately driven to move, thereby triggering the alarm switch 22. Specifically, the elastic wave plate 33 is welded to the bottom of the arc-shaped shell 31 to ensure that the lower surface of the flow rate switch structure 3 is sealed; the guide cylinder structure 321 is integrally formed with the arc-shaped shell 31, and the linear drive rod 322 is welded to the elastic wave plate 33 after pressing the sealing ring 323. The linear drive rod 322 is adapted to the outer contour of the limiting hole to ensure that the upper surface of the flow rate switch structure 3 is sealed. The linear drive rod 322 forms a dynamic seal with the arc-shaped shell 31 and the guide cylinder structure 321 through the sealing ring 323, that is, the linear drive rod 322 can move up and down, and at the same time, the compression and deformation of the sealing ring 323 on all sides can block the entry of external transformer oil.

[0066] In this embodiment, if Figure 4-6 As shown, the guide cylinder structure 321 includes a first guide cylinder 3211 and a second guide cylinder 3212 sleeved on the first guide cylinder 3211. The first guide cylinder 3211 is a cylindrical structure that extends vertically through the cylinder, and the second guide cylinder 3212 is a stopper hole that extends vertically through the cylinder. The first guide cylinder 3211 is integrally formed within the through hole. The top of the second guide cylinder 3212 is provided with a stopper surface 3212a. When the second guide cylinder 3212 is sleeved on the first guide cylinder 3211, the stopper surface 3212a is engaged with the top of the first guide cylinder 3211. The outer diameter of the linear drive rod 322 is slightly larger than the inner diameter of the stopper hole, further enhancing the sealing performance of the sealed cavity 34.

[0067] In this embodiment, if Figure 4 、 5As shown, the linear displacement assembly 32 also includes a spring 324, which is sleeved onto the linear drive rod 322. One end of the spring 324 is connected to the elastic wave plate 33, and the other end is connected to the bottom of the guide cylinder structure 321. The spring 324, with one end connected to the elastic wave plate 33 and the other end connected to the bottom of the first guide cylinder 321, initially provides a certain preload force for the linear drive rod 322. This preload force ensures that the linear drive rod 322 maintains a stable initial position when there is no oil flow or when the oil flow rate is low, preventing the alarm switch 22 from being falsely triggered by minor vibrations or external interference. When the oil flow rate begins to increase and the oil pressure differential between the upper and lower surfaces of the flow rate switch structure 3 generates an upward thrust that gradually overcomes the preload force of the spring 324, the linear drive rod 322 moves upward, triggering the alarm switch 22, thereby improving the sensitivity and accuracy of the flow rate switch structure 3. Once the flow rate decreases or stops, the reset force of the spring 324 and the gravity of the linear drive rod 322 automatically reset the linear drive rod 322 to return to the initial position, waiting for the next change in the oil flow rate.

[0068] In this embodiment, the alarm switch 22 comprises a micro switch, which is mounted on the switch bracket 21. A trigger plate for triggering the micro switch is disposed at the other end of the linear drive rod 322. The linear drive rod 322 can move the trigger plate, thereby triggering the micro switch.

[0069] In this embodiment, the microswitch operates on the following principle: an external mechanical force acts on the actuating reed through a transmission element (a pin, button, lever, roller, etc.). When the actuating reed reaches a critical point, a momentary action occurs, rapidly connecting or disconnecting the moving contact at the end of the actuating reed and the fixed contact. When the force on the transmission element is removed, the actuating reed generates a reverse actuating force. When the reverse stroke of the transmission element reaches the reed's critical point of actuation, the reverse action is instantaneously completed. The microswitch features a small contact spacing, a short actuating stroke, low actuating force, and rapid switching. The actuation speed of the moving contact is independent of the actuation speed of the transmission element.

[0070] In this embodiment, a magnetic member is provided at the other end of the linear drive rod 322, and the alarm switch 22 includes a reed switch. The reed switch is provided on the switch bracket 21, and the linear drive rod 322 can drive the magnetic member to move and trigger the reed switch. The magnetic member is made of magnet. Similarly, it can also be made of other magnetic materials, such as magnets. When a serious fault occurs in the transformer, the linear drive rod 322 can drive the magnetic member to move, the reed switch is attracted by the magnetic member, the reed switch is turned on, and an alarm signal is issued.

[0071] In this embodiment, if Figure 1 、 7 As shown, the flow rate-based tripping gas relay also includes a partition 4, which is mounted on the switch bracket 21. During normal transformer operation, oil flow may fluctuate due to various factors. The partition 4 helps reduce oil flow interference with gas relay detection, ensuring that the gas relay can accurately detect gas changes regardless of whether the oil flow is stable or fluctuating. In the event of a severe internal transformer fault, the partition 4 can withstand certain impacts and pressures, protecting the internal components of the gas relay from damage.

[0072] The present invention provides a gas relay based on flow rate tripping. When a serious fault occurs in the transformer, the transformer oil in the inner cavity 11 surges. Since the arc length of the arc-shaped housing 31 is greater than the linear length of the elastic wave plate 33, the oil flow velocity on the upper surface of the flow rate switch structure 3 is greater than the oil flow velocity on its lower surface. According to Bernoulli's principle, the oil flow pressure on the upper surface of the flow rate switch structure 3 is less than the oil flow pressure on its lower surface. The oil flow pressure difference between the upper and lower surfaces of the flow rate switch structure 3 causes the elastic wave plate 33 to deform upward, driving the linear displacement. The upward movement of component 32 triggers the alarm switch 22, generating a trip signal, shutting down the transformer and cessation of oil flow within the transformer. The linear displacement component 32 resets under the action of gravity. The flow rate switch structure 3 does not rely on the preload of a spring or magnet. Instead, it directly deforms the elastic wave plate 33 through the oil pressure differential, thereby driving the linear displacement component 32 upward to trigger the alarm switch 22. This avoids the problems caused by preload drift, improves the response speed and accuracy of the protective device, and improves the measurement accuracy and reliability of the gas relay for heavy gas signals. Furthermore, the flow rate switch structure 3 triggers the alarm based on the oil pressure differential between its upper and lower surfaces. This is less dependent on the specific laminar flow state of the oil flow. As long as the oil flow velocity reaches the set value, the resulting oil pressure differential can accurately trigger the alarm switch 22, improving the system's anti-interference ability and accuracy. The linear displacement component 32 resets naturally under the action of gravity, eliminating the need for an additional reset mechanism, simplifying the system structure and reducing maintenance costs. In summary, the present invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0073] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A gas relay based on flow rate tripping, for installation on a transformer, characterized in that: include: Relay housing (1), fixing bracket structure (2) and flow rate switch structure (3); The relay housing (1) is provided with an inner cavity (11) for accommodating transformer oil, and the fixed support structure (2) is arranged in the inner cavity (11); The fixed support structure (2) comprises a switch support (21) and an alarm switch (22) arranged on the switch support (21); The flow rate switch structure (3) comprises an upwardly convex arc-shaped housing (31), a linear displacement component (32), and an elastic wave plate (33) arranged at the bottom of the arc-shaped housing (31), wherein a sealed cavity (34) is formed between the arc-shaped housing (31) and the elastic wave plate (33); the arc-shaped housing (31) is fixed on the switch bracket (21); a through hole is provided at the top of the arc-shaped housing (31); one end of the linear displacement component (32) passes through the through hole and is connected to the elastic wave plate (33), and the other end is used to trigger the alarm switch (22); When a serious fault occurs in the transformer, the transformer oil in the inner cavity (11) surges. Since the arc length of the arc-shaped housing (31) is greater than the linear length of the elastic wave plate (33), the oil flow velocity on the upper surface of the flow rate switch structure (3) is greater than the oil flow velocity on the lower surface thereof. According to the Bernoulli principle, the oil flow pressure on the upper surface of the flow rate switch structure (3) is less than the oil flow pressure on the lower surface thereof. The oil flow pressure difference between the upper and lower surfaces of the flow rate switch structure (3) causes the elastic wave plate (33) to deform upward, driving the linear displacement component (32) to move upward, thereby triggering the alarm switch (22) to operate.

2. The gas relay based on flow rate tripping according to claim 1, characterized in that: The linear displacement assembly (32) comprises a guide cylinder structure (321) and a linear drive rod (322). The guide cylinder structure (321) is arranged in a through hole. The guide cylinder structure (321) is a limit hole that passes through from top to bottom. The limit hole is adapted to the outer contour of the linear drive rod (322). One end of the linear drive rod (322) passes through the limit hole and is connected to the elastic wave plate (33).

3. The gas relay based on flow rate tripping according to claim 2, characterized in that: The linear displacement assembly (32) further includes a sealing ring (323), and the sealing ring (323) is arranged in the limiting hole.

4. The gas relay based on flow rate tripping according to claim 2, characterized in that: The linear displacement assembly (32) further includes a spring (324), which is sleeved on the linear drive rod (322), and one end of the spring (324) is connected to the elastic wave plate (33), and the other end is connected to the bottom of the guide tube structure (321).

5. The gas relay based on flow rate tripping according to claim 2, characterized in that: The alarm switch (22) comprises a micro switch.

6. The gas relay based on flow rate tripping according to claim 5, characterized in that: The other end of the linear drive rod (322) is provided with a trigger plate for triggering the micro switch, and the linear drive rod (322) can drive the trigger plate to move.

7. The gas relay based on flow rate tripping according to claim 2, characterized in that: The other end of the linear drive rod (322) is provided with a magnetic piece, and the alarm switch (22) includes a reed switch. The linear drive rod (322) can drive the magnetic piece to move and trigger the reed switch.

8. The gas relay based on flow rate tripping according to claim 1, characterized in that: It also includes a partition (4), which is arranged on the switch bracket (21).

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