CN110739141A

CN110739141A - current transformer with high-low temperature error adjusting function

Info

Publication number: CN110739141A
Application number: CN201911030015.1A
Authority: CN
Inventors: 吴兴燕; 周楠; 陆汉兵; 秦俊
Original assignee: Jingjiang Jiangsu Mutual Inductor Ltd By Share Ltd
Current assignee: Jingjiang Jiangsu Mutual Inductor Ltd By Share Ltd
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2020-01-31

Abstract

The invention discloses current transformers with high and low temperature error adjusting functions, which are characterized in that an upper iron core is provided with an iron core buffer, a lower iron core is provided with a secondary winding, the upper iron core and the lower iron core are matched with each other, the protruding parts of the upper iron core and the lower iron core are sleeved with sealing rings, a lower body flange of each current transformer is provided with four through holes b, fastening inserts are arranged in the through holes b, an upper body flange of each current transformer is provided with four through holes a, a hexagon bolt penetrates through the through holes a and the through holes b and is matched and screwed with the fastening inserts to connect and fix an upper body of each current transformer and a lower body of each current transformer, a spring is arranged between the hexagon bolt and the upper body of each current transformer, flat gaskets are arranged at the upper end and the lower end of the spring, an aviation socket is arranged at the lower end of the lower body of each current transformer, a secondary wire is connected with the.

Description

current transformer with high-low temperature error adjusting function

Technical Field

The invention relates to the field of transformers, in particular to waterproof open-close type current transformers with high and low temperature error adjusting functions.

Background

With the transformation of urban and rural networks in the power industry of China and the continuous improvement of the automation degree of a low-voltage power distribution system, a current transformer is used as important electrical elements in the low-voltage power distribution system and has been widely applied to measurement, metering and system monitoring by . the basic requirements of power distribution network power equipment are technically advanced, safe and reliable operation, simple operation and maintenance, economy and reasonableness, energy conservation and environmental protection.

Disclosure of Invention

The invention aims to provide current transformers with high and low temperature error adjusting functions, which are simple in structure, can effectively adjust high and low temperature errors and solve the technical problems.

In order to achieve the technical purpose and achieve the technical requirements, the technical scheme includes that current transformers with high and low temperature error adjusting functions are characterized by comprising an upper transformer body and a lower transformer body, the upper transformer body and the lower transformer body are formed through casting and then cut along a cutting seam, the upper transformer body comprises an upper iron core, the lower transformer body comprises a lower iron core, the upper iron core and the lower iron core are formed through cutting the iron core, an iron core buffer is arranged on the upper iron core, a secondary winding is arranged on the lower iron core, the upper iron core and the lower iron core respectively protrude out of the upper transformer body and the lower transformer body and are in butt joint, sealing rings are sleeved on the protruding portions of the upper iron core and the lower iron core, four through holes b are formed in a flange of the lower transformer body, fastening inserts are arranged in the through holes b, a hexagon bolt penetrates through the through holes a and b and is matched with the fastening inserts to connect and fix the upper transformer body and the lower transformer body, springs are arranged between the hexagon bolt and the upper transformer body, flat gaskets are arranged at the upper ends and the lower ends of the springs, aviation sockets are connected with aviation sockets, and cable plugs are screwed tightly.

Preferably: the distance between the iron core buffer and the lower end face of the upper iron core is 6 mm; the distance between the secondary winding and the upper end face of the lower iron core is 6 mm.

Preferably: the upper body and the lower body of the mutual inductor are formed by casting epoxy resin.

Preferably: the sealing ring is made of silicon rubber, and the hardness is 18 +/-2 degrees of Shore hardness.

Preferably: the cross section of the sealing ring is trapezoidal and is matched with the tangent plane between the upper iron core and the lower iron core.

Preferably: the thickness of the sealing ring is larger than the sum of the protruding heights of the upper iron core and the lower iron core; the sealing ring is compressed to seal and waterproof the iron core notch.

Preferably: the Huamei aviation plug and the cable are subjected to sealing and waterproof treatment by adopting silicon rubber; and a silicon rubber ring is arranged between the aviation plug and the aviation socket.

The current transformer with the high-low temperature error adjusting function has the advantages that compared with the traditional structure, the hexagonal bolt penetrates through the through hole a and the through hole b and is matched with the fastening insert to be screwed to connect and fix the upper body of the transformer and the lower body of the transformer, the spring is arranged between the hexagonal bolt and the upper body of the transformer, the upper end and the lower end of the spring are respectively provided with the flat gasket, the spring has the functions of expansion with heat and contraction with cold, the iron core section is tightly combined within the specified temperature range of (-40 ℃ to +70 ℃), the mutual inductor error is basically unchanged at high and low temperatures, the combination surface of the iron core is provided with the sealing ring, the sealing and waterproof effects are good, the protection safety grade is high, the aviation plug is subjected to sealing and waterproof treatment by the south-size silicon rubber after being welded with the cable and is screwed on the aviation socket, the silicon rubber sealing ring is arranged between the aviation plug and the aviation socket to prevent water, the waterproof.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the installation of FIG. 1 of the present invention;

in the figure: 1. an upper body of the mutual inductor; 2, iron core buffering; 3. a hexagon bolt; 4, flat cushion; 5. a spring; 6. a seal ring; 7-1, an upper body flange of the mutual inductor; 7-2. a lower body flange of the mutual inductor; 8. fastening an insert; 9. an iron core; 9-1, an upper iron core; 9-2. lower iron core; 10. a secondary winding; 11. a transformer lower body; 12. installing an insert; 13. an aviation socket; 14. an aviation plug; 15. an electrical cable.

Detailed Description

In order to make the objects, technical solutions and advantageous effects of the present invention clearer, the present invention is further described in with reference to the accompanying drawings and the following detailed description;

in the attached drawing, current transformers with high and low temperature error adjusting functions are characterized by comprising an upper transformer body 1 and a lower transformer body 2, wherein the upper transformer body 1 and the lower transformer body 2 are formed by casting and then cut along a cutting seam, the upper transformer body 1 comprises an upper iron core 9-1, the lower transformer body 2 comprises a lower iron core 9-2, the upper iron core 9-1 and the lower iron core 9-2 are formed by cutting the iron cores 9, the upper iron core 9-1 is provided with an iron core buffer 2, the lower iron core 9-2 is provided with a secondary winding 10, the upper iron core 9-1 and the lower iron core 9-2 respectively protrude out of the upper transformer body 1 and the lower transformer body 2 and are combined with each other, a sealing ring 6 is sleeved on the protruding parts of the upper iron core 9-1 and the lower iron core 9-2, the flange 7-2 of the lower transformer body is provided with four through holes b, a fastening insert 8 is arranged in the through holes b, the flange 7-1 of the upper transformer body is provided with four through holes a through hole a, a hexagon bolt 3 penetrates through the through hole a fastening insert 8 to be matched with the fastening insert 8 to connect the upper transformer body 1 and the lower body, a plug of an aviation cable plug of an aviation plug 5 is welded with the lower end of the aviation cable plug of the aviation plug 13.

The distance between the iron core buffer 2 and the lower end face of the upper iron core 9-1 is 6 mm; the distance between the secondary winding 10 and the upper end face of the lower iron core 9-2 is 6 mm; the transformer upper body 1 and the transformer lower body 11 are formed by casting epoxy resin; the sealing ring 6 is made of silicon rubber, and the hardness is 18 +/-2 degrees of Shore hardness; the cross section of the sealing ring 6 is trapezoidal and is matched with a tangent plane between the upper iron core 9-1 and the lower iron core 9-2; the thickness of the seal ring 6 is larger than the sum of the protruding heights of the upper iron core 9-1 and the lower iron core 9-2; the sealing ring is compressed to seal and waterproof the iron core notch. The aviation plug 14 and the cable 15 are subjected to sealing and waterproof treatment by adopting silicon rubber; a silicone rubber ring is arranged between the aviation plug 14 and the aviation socket 13.

The invention is implemented specifically as follows: the mutual inductor is molded by casting with outdoor epoxy resin, and is resistant to high and low temperature, ultraviolet rays and aging; the sealing ring 6 is made of silicon rubber HD-7831, and the hardness is 18 +/-2 degrees; the shape of the sealing ring is matched with the section of the iron core, the cross section is trapezoidal, the inner length and the inner width are respectively greater than the length and the width of the section of the iron core by 2 mm, the height is greater than the sum of the exposed heights of the iron core by 1 mm, the elasticity and the flexibility of the sealing ring are good, the sealing and waterproof effects are good, and the protection safety level IP67 is achieved.

The hexagonal bolt 3 is made of stainless steel 304, the specification is M5, the total length is 55mm, the diameter of the polish rod part is 5.8 +/-0.1 mm, and the length is 37 mm; the tail part of the bolt is provided with a thread of M5-13 mm which is matched with the fastening insert; the flat cushion 4 is made of stainless steel 304, and the thickness of the flat cushion is 1.5 mm; the spring 5 is a cylindrical compression spring, is left-handed and is made of 304 stainless steel; the free height of the spring is 14 mm, and the spring load is about 330N; the fastening insert 8 is made of brass H62, and the specification is M5-12 mm; the hexagon bolt 3 is respectively sleeved into the flat pad 4, the spring 5 and the flat pad 4, and after the fastening insert 8 is screwed in, the lower end face of the polish rod of the hexagon bolt is combined with the end face of the fastening insert 8, and the hexagon bolt is automatically locked and positioned; the height of the upper flange 7 of the mutual inductor is 35mm, the height of the spring can be calculated to be compressed to 11 mm (37-1.5 x 2-23= 11) from 14 mm height by combining the dimensions of the fastener, the spring and the fastening insert, the strength and the toughness of the spring are ensured, the spring expands with heat and contracts with cold at the temperature of-40 ℃ to +70 ℃, the combination of the section of the iron core is ensured to be tight, the function of adjusting the error of the open-close type mutual inductor is achieved, and the high precision and the basically stable error value of the mutual inductor at the high temperature and the low temperature are realized.

The installation insert 12 is M6, cylindrical, blind hole, 12 mm high and made of brass H62, four through holes are correspondingly formed in the upper portion and the lower portion of the mutual inductor, the center distance between the two holes on the left side and the center distance between the two holes on the right side are not , in order to prevent the precision of the mutual inductor from being reduced due to field reverse installation, the installation insert has a foolproof effect, the aviation plug 14 is subjected to sealing and waterproof treatment by using Nanda 703 silicon rubber after being welded with the cable 15 and is screwed on the aviation socket 13, a silicon rubber sealing ring is arranged between the aviation plug 14 and the aviation socket 13 for preventing water, and the secondary position of the current.

The foregoing examples are given solely for the purpose of illustrating the invention and are not to be construed as limiting the embodiments, and other variations and modifications in form thereof will be suggested to those skilled in the art upon reading the foregoing description, and it is not necessary or necessary to exhaustively enumerate all embodiments and all such obvious variations and modifications are deemed to be within the scope of the invention.

Claims

The current transformer with the high-low temperature error adjusting function is characterized by comprising an upper transformer body (1) and a lower transformer body (2), wherein the upper transformer body (1) and the lower transformer body (2) are formed by casting and then cut along a cutting seam, the upper transformer body (1) comprises an upper iron core (9-1), the lower transformer body (2) comprises a lower iron core (9-2), the upper iron core (9-1) and the lower iron core (9-2) are cut through the iron core (9), the upper iron core (9-1) is provided with an iron core buffer (2), the lower iron core (9-2) is provided with a secondary winding (10), the upper iron core (9-1) and the lower iron core (9-2) respectively protrude out of the upper transformer body (1) and the lower transformer body (2) and are in a matched with each other, protruding parts of the upper iron core (9-1) and the lower iron core (9-2) are sleeved with a sealing ring (6), a transformer flange (7-2) is provided with four through holes b, fastening bolts (8) are arranged in the through holes b), a hexagon socket flanges (7-1) and a plug (3) are screwed with an aviation plug and a lower plug (13) connected with an aviation plug (13) which is screwed with an aviation plug and an aviation plug (13) which is arranged between the aviation plug and an aviation plug which is screwed with an aviation plug for fastening the aviation plug and an aviation plug for fastening the aviation plug.
2. The type current transformer with high and low temperature error regulation function according to claim 1, wherein the distance between the core buffer (2) and the lower end face of the upper core (9-1) is 6mm, and the distance between the secondary winding (10) and the upper end face of the lower core (9-2) is 6 mm.
3. The kinds of current transformers with high and low temperature error adjustment function according to claim 1, wherein the upper transformer body (1) and the lower transformer body (11) are formed by epoxy resin casting.
4. The kinds of current transformers with high and low temperature error adjustment functions according to claim 1, wherein the sealing ring (6) is made of silicon rubber and has a hardness of 18 ± 2 degrees shore.
5. The type current transformer with high and low temperature error adjustment function according to claim 4, wherein the cross section of the seal ring (6) is trapezoidal and matched with the tangent plane between the upper iron core (9-1) and the lower iron core (9-2).
6. The type current transformer with high and low temperature error adjustment function according to claim 5, wherein the thickness of the seal ring (6) is greater than the sum of the heights of the upper iron core (9-1) and the lower iron core (9-2) which protrude.
7. The current transformer with high and low temperature error adjustment function according to claim 1, wherein the aviation plug (14) and the cable (15) are sealed and waterproof by silicon rubber, and a silicon rubber ring is arranged between the aviation plug (14) and the aviation socket (13).