An inner oil type capsule expander for a transformer

Abstract

The utility model relates to a kind of inner oil type capsule expanders for mutual inductor, including a cabinet, with an expansion cavity in cabinet, with an expansion capsule being installed in the expansion cavity, the expansion capsule is fixed with cabinet by the cooperation of a pair of butt flanges, and expansion capsule and butt flange between it are integrally vulcanized into shape, butt flange and cabinet are fixed by the cooperation of bolt, the first interface of the insulating oil in mutual inductor is also opened in the bottom end of cabinet, and second interface, which is communicated with the first interface and the inside of expansion capsule, is also opened on butt flange, the upper cover plate cooperated with cabinet, the upper cover plate is fixed with cabinet by the cooperation of bolt.The expander in the utility model is formed by the way of setting expansion capsule in cabinet to constitute the expander cooperated with mutual inductor, and the structure can completely isolate insulating oil and air, and compared with metal corrugated expander, it has larger compensation oil amount and smaller volume.

Description

Technical Field

[0001] This utility model relates to the field of current transformers, and in particular to an internal oil-filled bladder expander for current transformers. Background Technology

[0002] To prevent the insulating oil inside the instrument transformer from coming into contact with the outside air and to keep the oil from getting damp and oxidizing, oil-immersed instrument transformers are all fully enclosed structures. High-voltage instrument transformers often use expansion joints to achieve sealing, which can keep the internal pressure of the instrument transformer basically constant within a specified range of pressure changes, thus reducing the occurrence of instrument transformer accidents.

[0003] Currently, most commonly used expanders on the market are metal corrugated expanders. The main body of a metal expander is actually an elastic element. When the volume of transformer oil inside the transformer changes due to temperature variations, the volume of the expander body changes accordingly, thus providing volume compensation. However, existing metal corrugated expanders are limited by their structure; the amount of oil compensation is directly related to the size of the expander's expansion joint. This means that if more compensation oil is needed, the expansion joint needs to be made larger, and vice versa. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an internal oil bladder expander for current transformers that has a large compensation oil volume and a small volume.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: an internal oil-type bladder expander for a current transformer, the innovation of which lies in: including

[0006] A cabinet has an expansion cavity inside, in which an expansion capsule is installed. The expansion capsule is fixed to the cabinet by a mating flange, and the expansion capsule and the mating flange are integrally vulcanized. The mating flange and the cabinet are fixed by bolts. At the bottom of the cabinet, there is a first interface for the inlet and outlet of the insulating oil in the current transformer. At the same time, there is a second interface on the mating flange that connects the first interface to the inside of the expansion capsule.

[0007] A top cover plate that mates with the cabinet body, the top cover plate being fixed to the cabinet body by bolts.

[0008] Furthermore, the expanded capsule is made of nitrile rubber or acrylate rubber.

[0009] Furthermore, an oil collection trough is provided at the bottom of the cabinet. The oil collection trough is a transparent container with an opening at the top, and an oil outlet connected to the oil collection trough is also provided at the bottom of the cabinet.

[0010] Furthermore, the connection between the cabinet body and the upper cover is as follows: the cabinet body is a cylindrical container with an open top, and a ring-shaped mounting plate seat for mounting the upper cover is provided on the upper surface of the cabinet body. The upper cover is fixed to the mounting plate seat by the cooperation of several bolts. A sealing ring is also provided between the upper cover and the mounting plate seat. A protruding boss is also provided at the middle position of the bottom end of the upper cover.

[0011] Furthermore, an oil level observation window is provided on the side wall of the cabinet.

[0012] Furthermore, the cabinet is an aluminum alloy cabinet.

[0013] The advantages of this utility model are as follows: The expander in this utility model is configured to cooperate with the current transformer by setting an expansion capsule inside the cabinet. This structure can completely isolate the insulating oil from the air, and compared with the metal corrugated expander, it has a larger compensation oil volume and a smaller volume.

[0014] An expansion capsule is used to temporarily store the insulating oil. The expansion capsule itself is soft and will not generate additional positive pressure on the transformer during operation, thus not affecting the safe operation of the product pressure relief valve, nor affecting the sealing structure.

[0015] The connection between the expansion capsule and the cabinet is achieved by using a mating flange. The expansion capsule and the mating flange are made by integral vulcanization molding, which ensures the reliability of the seal and makes the connection with the current transformer more stable. Attached Figure Description

[0016] Figure 1 This invention relates to an internal oil-type capsule expander for current transformers. Detailed Implementation

[0017] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0018] like Figure 1 The illustrated method includes an internal oil-filled bladder expander for a current transformer.

[0019] A cabinet 1, made of aluminum alloy, provides excellent corrosion resistance. Inside the cabinet 1 is an expansion cavity 14, within which an expansion capsule 2 is installed. The expansion capsule 2 is fixed to the cabinet 1 via a mating flange 21, and the expansion capsule 2 and the mating flange 21 are integrally vulcanized. The mating flange 21 is then secured to the cabinet 1 with bolts. The connection between the expansion capsule 2 and the cabinet 1 is achieved through the mating flange 21, and the integral vulcanization process ensures reliable sealing and a more secure connection with the current transformer.

[0020] At the bottom of cabinet 1, there is a first interface 13 for the inlet and outlet of insulating oil in the current transformer. Simultaneously, a second interface 22 is provided on the mating flange 21, connecting the first interface 13 to the interior of the expansion capsule 2. The size of the second interface 22 is no larger than the size of the first interface 13. The expansion capsule 2 is used for temporary storage of insulating oil. Because the expansion capsule 2 is soft, it will not generate additional positive pressure on the current transformer during operation, thus not affecting the safe operation of the product's pressure relief valve or the sealing structure.

[0021] In this embodiment, the expansion capsule 2 is made of nitrile rubber or acrylate rubber. Using nitrile rubber or acrylate rubber, materials with good compatibility with insulating oil, ensures that the expansion capsule 2 can be used normally throughout the entire product lifecycle.

[0022] A top cover plate 3 is provided to cooperate with the cabinet body 1. The top cover plate 3 is fixed to the cabinet body 1 by bolts. Specifically, the connection between the cabinet body 1 and the top cover plate 3 is as follows: the cabinet body 1 is a cylindrical container with an open top. A ring-shaped mounting plate seat 12 for mounting the top cover plate 3 is provided on the upper end face of the cabinet body 1. The top cover plate 3 is fixed to the mounting plate seat 12 by several bolts. A sealing ring is also provided between the top cover plate 3 and the mounting plate seat 12. A protruding boss 31 is also provided at the middle of the bottom end of the top cover plate 3.

[0023] An oil collection tank 4 is also provided at the bottom of the cabinet 1. The oil collection tank 4 is a transparent container with an opening at the top, and an oil outlet connected to the oil collection tank 4 is also provided at the bottom of the cabinet 1. In this embodiment, the oil collection tank 4 is made of transparent acrylic material, which makes it easy for users to directly observe the oil situation in the oil collection tank 4, so that users can detect abnormalities in time.

[0024] An oil level observation window 11 is also provided on the side wall of the cabinet 1. The oil level observation window 11 allows for direct monitoring of changes in the product's oil level, facilitating timely detection of any abnormalities. In this embodiment, the oil level observation window 11 is made of tempered glass, which has wear-resistant and UV-resistant properties.

[0025] The expander in this invention is configured to work with the current transformer by setting an expansion capsule inside the cabinet. This structure can completely isolate the insulating oil from the air, and compared with the metal corrugated expander, it has a larger compensation oil volume and a smaller volume.

[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. An internal oil-type bladder expander for a current transformer, characterized in that: include A cabinet has an expansion cavity inside, in which an expansion capsule is installed. The expansion capsule is fixed to the cabinet by a mating flange, and the expansion capsule and the mating flange are integrally vulcanized. The mating flange and the cabinet are fixed by bolts. At the bottom of the cabinet, there is a first interface for the inlet and outlet of the insulating oil in the current transformer. At the same time, there is a second interface on the mating flange that connects the first interface to the inside of the expansion capsule. A top cover plate that mates with the cabinet body, the top cover plate being fixed to the cabinet body by bolts.

2. The internal oil-filled bladder expander for a current transformer according to claim 1, characterized in that: The inflatable capsule is made of nitrile rubber or acrylate rubber.

3. The internal oil-filled bladder expander for a current transformer according to claim 1, characterized in that: The bottom of the cabinet is also provided with an oil collection tank, which is a transparent container with an open top. At the same time, an oil outlet connected to the oil collection tank is also opened at the bottom of the cabinet.

4. The internal oil-filled bladder expander for a current transformer according to claim 1, characterized in that: The connection between the cabinet body and the top cover is as follows: the cabinet body is a cylindrical container with an open top. A ring-shaped mounting plate base for mounting the top cover is provided on the upper surface of the cabinet body. The top cover is fixed to the mounting plate base by several bolts. A sealing ring is also provided between the top cover and the mounting plate base. A protruding boss is also provided at the middle of the bottom end of the top cover.

5. The internal oil-filled bladder expander for a current transformer according to claim 1, characterized in that: An oil level observation window is also provided on the side wall of the cabinet.

6. The internal oil-filled bladder expander for a current transformer according to claim 1, characterized in that: The cabinet is made of aluminum alloy.

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