Oil-immersed current transformer

Abstract

The utility model provides an oil-immersed current transformer which comprises an oil tank, a buffer tank is fixedly arranged on one side of the oil tank, a pressure relief pipe communicated with the interior of the oil tank is arranged on the side face of the oil tank in the buffer tank, an anti-explosion cover plate is arranged at the end of the pressure relief pipe, an air leakage opening is formed in the top of the buffer tank, and the pressure relief pipe is communicated with the interior of the oil tank. A one-way air leakage mechanism corresponding to the air leakage opening is arranged at the top of the air leakage opening, and the one-way air leakage mechanism is in one-way conduction from the interior of the buffer box to the exterior of the buffer box; according to the utility model, when a fault occurs, a large amount of gas is generated in the product, the pressure in the oil tank is increased, and when the pressure in the oil tank reaches a certain degree, the explosion-proof cover plate falls off from the pressure relief pipe under the action of the pressure, and insulating oil in the oil tank enters the buffer tank through the pressure relief pipe, so that the pressure in the oil tank is released; and meanwhile, the insulating oil is sprayed into the buffer tank to be collected, so that pollution to the site and equipment can be avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of mutual inductors, and in particular relates to an oil-immersed current mutual inductor. Background Art

[0002] The initial explosion-proof measure for current transformers was to install explosion-proof plates on the expander at the top of the product. Since the expander is at the top of the product and the area of ​​the explosion-proof plate is small, when the product fails, a large amount of gas is generated inside and the internal pressure increases rapidly. The pressure is mainly concentrated in the product oil tank and porcelain sleeve. The top explosion-proof plate cannot release the pressure in a timely and effective manner, causing a highly destructive explosion.

[0003] In the prior art, a Chinese utility model patent document with authorization announcement number CN216980282U discloses an oil-immersed current transformer with an explosion-proof device. When a fault occurs, a large amount of gas is generated inside the product. When the internal pressure increases, it exceeds the explosion pressure limit of the explosion-proof plate. The insulating oil releases a certain pressure in the explosion-proof plate through the oil and gas channel, and the explosion-proof baffle buffers the remaining pressure. After the pressure is released, the porcelain sleeve of the current transformer will not rupture and explode, and the splashes generated by the explosion are controlled within the specified area; however, after the explosion, the insulating oil flows out from the left and right sides of the explosion-proof baffle, causing pollution to the on-site equipment and site.

[0004] Therefore, it is necessary to design an oil-immersed current transformer that can release the pressure in time when the internal pressure of the oil tank rises to a certain level, and collect the leaked insulating oil to avoid contamination of on-site equipment and sites, so as to solve the current technical problems. Summary of the invention

[0005] In view of the deficiencies in the prior art, the utility model provides an oil-immersed current transformer which can timely release the pressure when the internal pressure of the oil tank rises to a certain level, and collect the leaked insulating oil to avoid contamination of on-site equipment and sites.

[0006] The technical solution of the utility model is: an oil-immersed current transformer, comprising an oil tank, a buffer box is fixedly arranged on one side of the oil tank, a pressure relief pipe connected to the interior of the oil tank is arranged on the side of the oil tank inside the buffer box, an explosion-proof cover is arranged on the end of the pressure relief pipe, an air leakage port is opened on the top of the buffer box, a one-way air leakage mechanism corresponding to the air leakage port is arranged on the top of the air leakage port, and the one-way air leakage mechanism is unidirectionally conducted from the interior of the buffer box to the outside thereof.

[0007] The one-way air release mechanism has a pressure plate corresponding to the air release port, a guide rod is vertically fixed on the top of the pressure plate, a bracket is provided on the top of the buffer box, the guide rod is slidably connected to the bracket, and a spring is sleeved on the outer side of the guide rod between the pressure plate and the bracket.

[0008] A sealing gasket is fixedly arranged at the bottom of the pressing plate, and the sealing gasket corresponds to the air leakage port.

[0009] A connecting edge which is an integral structure with the pressure relief pipe is fixedly arranged on the outer side of the end of the pressure relief pipe, and an inner buckle edge which is an integral structure with the explosion-proof cover is arranged on the outer side of the explosion-proof cover, and the inner buckle edge is covered on the outer side of the connecting edge.

[0010] A sealing ring is fixedly provided on one side of the explosion-proof cover plate close to the pressure relief pipe, and the sealing ring corresponds to one side of the connecting edge.

[0011] An inspection opening is provided on one side of the buffer box, and a cover plate is detachably fixedly provided at the end of the inspection opening.

[0012] An oil drain valve is arranged at the bottom of one side of the buffer tank, and the oil drain valve is communicated with the buffer tank.

[0013] The interior of the buffer tank is filled with an inert gas.

[0014] Beneficial effects of the utility model: In the utility model, when a fault occurs, a large amount of gas is generated inside the product, and the pressure inside the oil tank increases. When the pressure inside the oil tank reaches a certain level, the explosion-proof cover falls off from the pressure relief pipe under the action of pressure, and the insulating oil inside the oil tank enters into the buffer box through the pressure relief pipe, releasing the pressure inside the oil tank. At the same time, the insulating oil is sprayed into the buffer box for collection, which can avoid pollution to the site and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the oil-immersed current transformer in the utility model.

[0016] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0017] Figure 3 It is a schematic diagram of the internal structure of the buffer box in the utility model.

[0018] Figure 4 for Figure 3 A partial enlarged view of point B in the middle. DETAILED DESCRIPTION

[0019] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is not intended to be any limitation on the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limitations.

[0020] The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] like Figures 1 to 3 As shown, the oil-immersed current transformer includes an oil tank 1, a buffer box 2 is fixedly arranged on one side of the oil tank 1, a pressure relief pipe 11 connected to the inside of the oil tank 1 is arranged on the side of the oil tank 1 inside the buffer box 2, an explosion-proof cover 5 is arranged at the end of the pressure relief pipe 11, a gas relief port 23 is opened on the top of the buffer box 2, and a one-way gas relief mechanism 3 corresponding to the gas relief port 23 is arranged on the top, and the one-way gas relief mechanism 3 is unidirectionally conducted from the inside of the buffer box 2 to the outside thereof; in this embodiment, when a fault occurs, a large amount of gas is generated inside the product, and the internal pressure of the oil tank 1 increases. When the internal pressure of the oil tank 1 reaches a certain level, the explosion-proof cover 5 falls off from the pressure relief pipe 11 under the action of pressure, and the insulating oil inside the oil tank 1 enters into the inside of the buffer box 2 through the pressure relief pipe 11, and the pressure inside the oil tank 1 is released. At the same time, the insulating oil is sprayed into the inside of the buffer box 2 for collection, which can avoid pollution to the site and equipment.

[0022] In some embodiments, as a specific implementation of the one-way deflation mechanism 3, as Figure 2As shown, the one-way air release mechanism 3 has a pressure plate 32 corresponding to the air release port 23, a guide rod 34 is vertically fixed on the top of the pressure plate 32, a bracket 33 is arranged on the top of the buffer box 2, the bracket 33 is in an inverted "U" shape, both ends of the bracket 33 are welded and fixed to the top of the buffer box 2, a through hole matching the guide rod 34 is opened on the top of the bracket 33, the guide rod 34 is installed inside the through hole and is slidably connected to the bracket 33, a spring 35 is sleeved on the outside of the guide rod 34 between the pressure plate 32 and the bracket 33, and a spring 35 is inserted through the spring 35. 5 applies elastic force between the bracket 33 and the pressing plate 32 to keep the pressing plate 32 and the air release port 23 in a tightly closed state. When a fault occurs, a large amount of gas is generated inside the product, and the internal pressure of the oil tank 1 increases. When the internal pressure of the oil tank 1 reaches a certain level, the explosion-proof cover 5 falls off from the pressure relief pipe 11 under the action of pressure, and the insulating oil inside the oil tank 1 enters the buffer box 2 through the pressure relief pipe 11. The internal pressure of the buffer box 2 increases, and the pre-filled gas inside the buffer box 2 is discharged from the one-way air release mechanism 3.

[0023] In some embodiments, in order to improve the sealing performance between the pressure plate 32 and the air vent 23 , a sealing gasket 31 is fixedly provided at the bottom of the pressure plate 32 . The sealing gasket 31 corresponds to the air vent 23 and is a rubber sealing gasket.

[0024] In some embodiments, Figure 1 and 4 As shown, a connecting edge 111 which is an integral structure with the pressure relief pipe 11 is fixedly provided on the outer side of the end portion thereof, and an inner buckle edge 51 which is an integral structure with the pressure relief pipe 11 is provided on the outer side of the explosion-proof cover plate 5, and the inner buckle edge 51 is covered on the outer side of the connecting edge 111, and the outer diameter of the explosion-proof cover plate 5 is slightly larger than the outer diameter of the connecting edge 111, and the explosion-proof cover plate 5 is abutted against one side of the connecting edge 111, and the outer side of the explosion-proof cover plate 5 is bent 180° toward the other side of the connecting edge 111 to form the inner buckle edge 51, and the explosion-proof cover plate 5 and the pressure relief pipe 11 are fixedly connected through the inner buckle edge 51. When a fault occurs, a large amount of gas is generated inside the product, and the internal pressure of the oil tank 1 increases. When the internal pressure of the oil tank 1 reaches a certain level, the pressure of the insulating oil acts on one side of the explosion cover plate 5. When the pressure value reaches a certain level, the inner buckle edge 51 is deformed, and the explosion-proof cover plate 5 falls off from the connecting edge 11 to relieve the pressure.

[0025] In some embodiments, a sealing ring 52 is fixedly provided on one side of the explosion-proof cover plate 5 close to the pressure relief pipe 11 , the sealing ring 52 corresponds to one side of the connecting edge 111 , and the sealing ring 52 is a rubber sealing ring.

[0026] In some embodiments, an inspection port 22 is provided on one side of the buffer box 2, and a cover plate 4 is detachably fixedly provided at the end of the inspection port 22. The inspection port 22 is detachably fixedly connected to the cover plate 4 via a flange, and the internal structure of the buffer box 2 can be maintained after the cover plate 4 is removed.

[0027] In some embodiments, an oil drain valve 21 is provided at the bottom of one side of the buffer box 2 , and the oil drain valve 21 is connected to the buffer box 2 . After the pressure relief is completed, the insulating oil inside the buffer box 2 can be discharged to the outside through the oil drain valve 21 .

[0028] In some embodiments, the buffer box 2 is filled with an inert gas, which can prevent the insulating oil from being oxidized when the insulating oil enters the buffer box 2; specifically, the inert gas filled in the buffer box 2 is nitrogen.

[0029] So far, various embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0030] The above-mentioned embodiments only express some implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An oil-immersed current transformer, comprising an oil tank, characterized in that: A buffer box is fixedly provided on one side of the oil tank, a pressure relief pipe connected with the interior of the oil tank is provided on the side of the oil tank inside the buffer box, an explosion-proof cover is provided on the end of the pressure relief pipe, an air leakage port is opened on the top of the buffer box, a one-way air leakage mechanism corresponding to the air leakage port is provided on the top of the air leakage port, and the one-way air leakage mechanism is unidirectionally conducted from the interior of the buffer box to the outside thereof.

2. The oil-immersed current transformer according to claim 1, characterized in that: The one-way air release mechanism has a pressure plate corresponding to the air release port, a guide rod is vertically fixed on the top of the pressure plate, a bracket is provided on the top of the buffer box, the guide rod is slidably connected to the bracket, and a spring is sleeved on the outer side of the guide rod between the pressure plate and the bracket.

3. The oil-immersed current transformer according to claim 2, characterized in that: A sealing gasket is fixedly arranged at the bottom of the pressing plate, and the sealing gasket corresponds to the air leakage port.

4. The oil-immersed current transformer according to claim 1, characterized in that: A connecting edge which is an integral structure with the pressure relief pipe is fixedly arranged on the outer side of the end of the pressure relief pipe, and an inner buckle edge which is an integral structure with the explosion-proof cover is arranged on the outer side of the explosion-proof cover, and the inner buckle edge is covered on the outer side of the connecting edge.

5. The oil-immersed current transformer according to claim 4, characterized in that: A sealing ring is fixedly provided on one side of the explosion-proof cover plate close to the pressure relief pipe, and the sealing ring corresponds to one side of the connecting edge.

6. The oil-immersed current transformer according to claim 1, characterized in that: An inspection opening is provided on one side of the buffer box, and a cover plate is detachably fixedly provided at the end of the inspection opening.

7. The oil-immersed current transformer according to claim 1, characterized in that: An oil drain valve is arranged at the bottom of one side of the buffer tank, and the oil drain valve is communicated with the buffer tank.

8. The oil-immersed current transformer according to claim 1, characterized in that: The interior of the buffer tank is filled with an inert gas.

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