CN216250271U - 35kV totally enclosed type current transformer - Google Patents

35kV totally enclosed type current transformer Download PDF

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Publication number
CN216250271U
CN216250271U CN202122508188.9U CN202122508188U CN216250271U CN 216250271 U CN216250271 U CN 216250271U CN 202122508188 U CN202122508188 U CN 202122508188U CN 216250271 U CN216250271 U CN 216250271U
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CN
China
Prior art keywords
current transformer
secondary winding
cable
inner cone
totally enclosed
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Active
Application number
CN202122508188.9U
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Chinese (zh)
Inventor
王维贤
董国鹏
姚伟
钱青
卢树桥
丁锦
张可
廖军
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Hubei Daerhu Technology Co ltd
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Hubei Daerhu Technology Co ltd
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Priority to CN202122508188.9U priority Critical patent/CN216250271U/en
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Abstract

The utility model discloses a 35kV fully-enclosed current transformer which comprises a current transformer body, wherein an insulating shell is formed outside the current transformer body in a casting mode, a plurality of groove-shaped inner cone contact ends are arranged at the upper end of the insulating shell, the lower ends of the inner cone contact ends are connected with the current transformer body, a voltage-sharing ring is sleeved and connected on the outer side of the upper end of each inner cone contact end, a hexagonal inner cone connector is integrally formed in each inner cone contact end, and a cable is fixedly connected to the upper end of each inner cone connector. The utility model is suitable for air insulation high-voltage switch cabinets, has simple structure, the cable can be directly inserted into the inner cone interface which is integrally formed on the insulation shell, the installation is convenient, the full sealing of the introduced high-voltage part is realized, the size of the cabinet body is not required to be increased, the energy saving and consumption reduction are realized, and the long-term normal operation of the current transformer in a high-pollution environment is met.

Description

35kV totally enclosed type current transformer
Technical Field
The utility model belongs to the technical field of current transformers, and particularly relates to a 35kV fully-enclosed current transformer.
Background
When a measurement control device in a power system collects high-voltage transmission equipment of a power grid, a current transformer is needed. The current transformer converts a large current in the high-voltage power grid into a safe small current.
In the prior art, internal elements of a 35kV air insulation high-voltage switch cabinet are provided with exposed conductors such as copper busbars, fixing bolts and the like, and the air distance and the insulation requirements of the exposed conductors cannot be guaranteed. In addition, the 35kV air insulation high-voltage switch cabinet has high operation voltage, the size of the cabinet body needs to be increased if the insulation requirement is met, and the long-term normal operation of equipment cannot be met under a high-pollution environment due to inconvenient installation.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides a 35kV fully-enclosed current transformer which is suitable for an air-insulated high-voltage switch cabinet, has a simple structure, is convenient to install, realizes the totally-enclosed introduction of a high-voltage part, does not need to increase the size of a cabinet body, realizes energy conservation and consumption reduction, and meets the requirement of long-term normal operation of the current transformer in a high-pollution environment, and an inner cone interface integrally formed on an insulating shell can be directly inserted with a cable.
The technical scheme provided by the utility model is as follows:
the utility model provides a 35kV totally enclosed type current transformer, includes the current transformer body, the outer casting moulding of current transformer body has insulating casing, insulating casing sets up the interior awl contact jaw that a plurality of is the flute profile in the upper end, interior awl contact jaw lower extreme with the current transformer body links to each other, interior awl contact jaw upper end outside cover is established and is connected with the equalizer ring, integrated into one piece has the interior awl interface that is the hexagonal in the interior awl contact jaw, interior awl interface upper end fixedly connected with cable.
Furthermore, the cable comprises a cable connector and a primary cable, and the cable connector and the primary cable are fixedly connected up and down.
Furthermore, the cable connector is of a plug-in type and is matched with the inner cone connector.
Further, the current transformer body comprises a primary winding, a secondary winding and a secondary winding magnetic core, the primary winding penetrates through and is wound and fixed on the secondary winding, the secondary winding is wound and fixed on the secondary winding magnetic core, and the secondary winding is connected with a secondary terminal through a wire.
Furthermore, the outer surfaces of the primary winding and the secondary winding are respectively sleeved with a primary winding outer shielding layer and a secondary winding outer shielding layer.
Further, the secondary terminal is clamped at the bottom side of the insulating shell.
The utility model has the beneficial effects that: 1) the arranged inner cone interface and the insulating shell are cast into a whole, and are matched with compatible installation cables, so that the high-voltage part of the lead-in current transformer is fully closed, and the insulating requirement is met; 2) The size of the cabinet body does not need to be increased due to the built-in inner cone connector, so that the cable connector can be conveniently and quickly installed; 3) the arranged grading rings enable the high-voltage electric field to be uniformly distributed; 4) the primary winding outer shielding layer and the secondary winding outer shielding layer arranged on the primary winding and the secondary winding can prevent the interference of an external electric field to realize the normal operation of the equipment.
Drawings
FIG. 1 is a schematic structural diagram of a 35kV fully-enclosed current transformer of the present invention;
FIG. 2 is a right side view of FIG. 1;
fig. 3 is a top view of fig. 1.
In the figure: 1. a primary cable line; 2. a cable joint; 3. an inner cone interface; 4. an inner cone conductive contact end; 5. A primary winding; 6. an outer shielding layer of the primary winding; 7. a secondary winding magnetic core; 8. a secondary winding; 9. an outer shielding layer of the secondary winding; 10. a secondary terminal; 11. a grading ring; 12. an insulating housing.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
It should be noted that in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.
Example 1
As shown in fig. 1 to 3, a 35kV totally enclosed current transformer comprises a current transformer body, wherein an insulating shell 12 is formed outside the current transformer body by casting, a plurality of groove-shaped inner cone contact ends 4 are formed at the upper end of the insulating shell 12, the lower ends of the inner cone contact ends 4 are connected with the current transformer body, an equalizing ring 11 is sleeved outside the upper end of each inner cone contact end 4, an inner cone connector 3 in the shape of a secondary winding outer shielding layer 9 square is integrally formed in each inner cone contact end 4, a cable is fixedly connected to the upper end of each inner cone connector 3, the cable comprises a cable connector 2 and a primary cable line 1, and the cable connector 2 and the primary cable line 1 are fixedly connected from top to bottom.
Further to this embodiment, the cable connector 2 is of a plug-in type, and is adapted to the inner cone connector 3.
Further, the current transformer body includes a primary winding 5, a secondary winding 8 and a secondary winding magnetic core 7, the primary winding 5 passes through and is wound and fixed on the secondary winding 8, the secondary winding 8 is wound and fixed on the secondary winding magnetic core 7, and the secondary winding 8 is connected with a secondary terminal 10 through a wire. When the current transformer is used for measurement, the secondary winding magnetic core 7 adopts a high-permeability iron core, so that the signal precision and sensitivity under weak current are ensured; when the current transformer is used for protection, the secondary winding magnetic core 7 adopts a high-saturation silicon steel core, so that the current value is correctly reflected when overcurrent occurs.
Further, the outer surfaces of the primary winding 5 and the secondary winding 8 are respectively sleeved with a primary winding outer shielding layer 6 and a secondary winding outer shielding layer 9, and the outer shielding layers play a role in preventing interference of an external electric field.
Further, the secondary terminal 10 is clamped at the bottom side of the insulating housing 12, so as to be connected with a measuring or protecting device.
The working principle of the utility model is as follows: the primary cable 1 is inserted into the inner cone connector 3 through the plug-in cable connector 2, so that the high-voltage part is totally closed, primary current enters the primary winding 5 through the inner cone conductive contact end 4, and the secondary winding magnetic core 7 forms an alternating magnetic field, so that secondary current is induced by the secondary winding 8 and is output to equipment for measurement or protection through the secondary terminal 10.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention can be made by those skilled in the art without departing from the principle and spirit of the present invention, and the scope of the present invention is defined by the appended claims.

Claims (6)

1. The utility model provides a 35kV totally enclosed type current transformer, includes the current transformer body, the outer casting moulding of current transformer body has insulating casing (12), its characterized in that, a plurality of interior awl contact jaw (4) that are the recess type are seted up to insulating casing (12) upper end, interior awl contact jaw (4) lower extreme with the current transformer body links to each other, interior awl contact jaw (4) upper end outside cover is established and is connected with equalizer ring (11), integrated into one piece has interior awl interface (3) that are secondary winding outer shielding layer (9) square in interior awl contact jaw (4), interior awl interface (3) upper end fixedly connected with cable.
2. A 35kV totally enclosed current transformer according to claim 1, wherein the cable comprises a cable joint (2) and a primary cable (1), and the cable joint (2) and the primary cable (1) are fixedly connected up and down.
3. The 35kV totally enclosed current transformer according to claim 2, wherein the cable connector (2) is of a plug type and is adapted to the inner cone connector (3).
4. The 35kV totally enclosed current transformer according to claim 1, wherein the current transformer body comprises a primary winding (5), a secondary winding (8) and a secondary winding magnetic core (7), the primary winding (5) passes through and is wound and fixed on the secondary winding (8), the secondary winding (8) is wound and fixed on the secondary winding magnetic core (7), and the secondary winding (8) is connected with a secondary terminal (10) through a wire.
5. The 35kV totally enclosed current transformer as claimed in claim 4, wherein the primary winding (5) and the secondary winding (8) are respectively sleeved with a primary winding outer shielding layer (6) and a secondary winding outer shielding layer (9) on the outer surface.
6. A35 kV totally enclosed current transformer according to claim 4, characterized in that said secondary terminal (10) is clamped to the bottom side of said insulating housing (12).
CN202122508188.9U 2021-10-18 2021-10-18 35kV totally enclosed type current transformer Active CN216250271U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202122508188.9U CN216250271U (en) 2021-10-18 2021-10-18 35kV totally enclosed type current transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202122508188.9U CN216250271U (en) 2021-10-18 2021-10-18 35kV totally enclosed type current transformer

Publications (1)

Publication Number Publication Date
CN216250271U true CN216250271U (en) 2022-04-08

Family

ID=80986988

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202122508188.9U Active CN216250271U (en) 2021-10-18 2021-10-18 35kV totally enclosed type current transformer

Country Status (1)

Country Link
CN (1) CN216250271U (en)

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