Current transformer for environment-friendly gas insulated switchgear

Abstract

The utility model discloses a current transformer for an environment-friendly gas-insulated switchgear, which comprises an epoxy resin main body, a primary winding is connected to the center of the epoxy resin main body, the primary winding is a copper pipe, the center of the primary winding is provided with a round hole, a secondary winding is connected to the epoxy resin main body, the primary winding penetrates through the center hole of the secondary winding, and the round hole is formed in the center of the secondary winding. The epoxy resin main body, the primary winding and the secondary winding are formed by casting, the bottom of the epoxy resin main body is provided with a sealing groove, and the sealing groove is used for being attached to the outer wall of the gas tank. The copper pipe is used for replacing a cable to serve as the primary winding, the use amount of copper is reduced through a round hole in the copper pipe, and cost is reduced; and meanwhile, the circular holes can enable gas to circulate, so that the temperature rise of a primary loop is reduced, and the current transformer can meet the test standard in a limited space.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage electrical equipment, in particular to a current transformer for an environmentally friendly gas-insulated switchgear (GIS). Background Technique

[0002] The environmentally friendly gas-insulated switchgear completely eliminates SF6 gas and uses environmentally friendly gases such as dry air or nitrogen, while maintaining the advantages of full insulation and full enclosure of the gas-insulated switchgear. Due to the reduced insulation performance of dry air or nitrogen compared to SF6 gas, higher requirements are imposed on the external dimensions of the current transformer and the layout of the primary winding and secondary winding in a limited space. Therefore, in the prior art, how to design a current transformer that can meet the insulation performance while also meeting the technical requirements of the environmentally friendly gas-insulated switchgear is a technical problem that those skilled in the art urgently need to solve. Content of the Utility Model

[0003] The purpose of the utility model is to provide a current transformer for an environmentally friendly gas-insulated switchgear. By using a copper tube instead of a cable as the primary winding, the amount of copper used is reduced by using the round hole inside the copper tube, the cost is reduced, and at the same time, the round hole can allow gas to flow through, reducing the temperature rise of the primary circuit and meeting the test standard.

[0004] The utility model provides the following technical solution: A current transformer for an environmentally friendly gas-insulated switchgear, including an epoxy resin main body, a primary winding is connected to the center of the epoxy resin main body, the primary winding is a copper tube and a round hole is opened in the center, a secondary winding is connected to the epoxy resin main body, the primary winding passes through the center hole of the secondary winding, and the epoxy resin main body, the primary winding and the secondary winding are cast and formed.

[0005] In order to improve airtightness, a sealing groove is opened at the bottom of the epoxy resin main body, and the sealing groove is used to fit on the outer wall of the gas tank.

[0006] In order to position the secondary winding, a screw is arranged in the sealing groove, and the screw is used to position the secondary winding so that the secondary winding and the primary winding are concentrically distributed.

[0007] In order to facilitate wiring, secondary terminals are also arranged at the bottom of the epoxy resin main body, and the secondary terminals are connected to the secondary winding through leads.

[0008] In order to reduce the non-uniform electric field, both ends of the epoxy resin main body are designed in an umbrella skirt shape.

[0009] In order to connect copper bars and connect with other components, two mounting holes are opened at both ends of the primary winding

[0010] Compared with the prior art, the beneficial effects achieved by the utility model are as follows: By using a copper tube as the primary winding and reducing the amount of copper through the round holes inside the copper tube, the cost is reduced. At the same time, the round holes enable gas circulation, reduce the temperature rise of the primary circuit, and meet the test standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings are used to provide a further understanding of the utility model, and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the utility model, but do not constitute a limitation to the utility model. In the drawings:

[0012] Figure 1 is a schematic diagram of the internal structure of the current transformer of the utility model;

[0013] Figure 2 is a schematic diagram of the side structure of the current transformer of the utility model;

[0014] In the figure: 1, epoxy resin main body; 2, primary winding; 21, round hole; 22, mounting hole; 3, secondary winding; 4, secondary terminal; 5, sealing groove; 6, screw. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the utility model with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the utility model. Embodiment

[0016] Please refer to Figure 1 , the utility model provides a technical solution: a current transformer for an environmentally friendly gas-insulated switchgear, including an epoxy resin main body 1. The center of the epoxy resin main body 1 is connected with a primary winding 2. The primary winding 2 is a copper tube and is provided with a round hole in the center. By means of the round hole, the amount of copper is reduced, and the cost of the current transformer is reduced. Moreover, the round hole enables gas to circulate inside the copper tube of the primary winding 2, reduces the temperature rise of the primary circuit, and enables the environmentally friendly gas cabinet to meet the test standard of temperature rise. A secondary winding 3 is connected to the epoxy resin main body 1. The primary winding 2 passes through the central hole of the secondary winding 3. The epoxy resin main body 1, the primary winding 2, and the secondary winding 3 are cast and formed, with a simple structure and a reduced amount of epoxy resin used.

[0017] A sealing groove 5 is provided at the bottom of the epoxy resin main body 1. The sealing groove 5 is used to fit on the outer wall of the gas box, ensuring the airtightness of the gas box.

[0018] A screw rod 6 is arranged in the sealing groove 5. The screw rod 6 is used to position the secondary winding 3 so that the secondary winding 3 and the primary winding 2 are concentrically distributed. The arrangement of the screw rod 6 facilitates the casting of the interior of the current transformer and can position the secondary winding 3 at the same time.

[0019] A secondary terminal 4 is also arranged at the bottom of the epoxy resin body 1. The secondary terminal 4 is connected to the secondary winding 3 through a lead, which is convenient for later installation and wiring.

[0020] Both ends of the epoxy resin body 1 are designed in an umbrella skirt shape. The umbrella skirt shapes are evenly distributed at both ends. The umbrella skirt shapes are multiple concentric rings, and the height of the rings gradually increases from the outside to the inside, which can reduce the uneven electric field at both ends of the primary winding for connecting copper busbars and enable the current transformer to meet the insulation performance requirements.

[0021] As Figure 2 shown, two mounting holes 22 are formed at both ends of the primary winding 2. The mounting holes 22 are used to connect copper bars to connect the current transformer and other components.

[0022] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A current transformer for an environmentally friendly inflatable cabinet, comprising an epoxy resin body, characterized in that: The center of the epoxy resin body is connected to a primary winding, which is a copper tube with a circular hole in the center. The epoxy resin body is connected to a secondary winding, which passes through the center hole of the secondary winding. The epoxy resin body, the primary winding and the secondary winding are cast.

2. The current transformer for environmentally friendly inflatable cabinet according to claim 1 is characterized in that: A sealing groove is provided at the bottom of the epoxy resin body, and the sealing groove is used to fit on the outer wall of the air box.

3. The current transformer for environmentally friendly inflatable cabinet according to claim 2 is characterized in that: A screw is arranged in the sealing groove, and the screw is used to position the secondary winding so that the secondary winding and the primary winding are concentrically distributed.

4. The current transformer for environmentally friendly inflatable cabinet according to claim 1 is characterized in that: A secondary terminal is also provided at the bottom of the epoxy resin body, and the secondary terminal is connected to the secondary winding through a lead wire.

5. The current transformer for environmentally friendly inflatable cabinet according to claim 1, characterized in that: Both ends of the epoxy resin body are designed to be in the shape of umbrella skirts.

6. The current transformer for environmentally friendly inflatable cabinet according to claim 1, characterized in that: Two mounting holes are provided on both ends of the primary winding.

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