Low magnetic induction lead for transformer

Abstract

The invention provides a low-magnetic-induction lead for a transformer, and belongs to the technical field of transformers. The low-magnetic-induction lead for the transformer comprises a connecting lead and a magnet blocking assembly, the magnet blocking assembly comprises a magnet blocking cylinder and a supporting frame, the supporting frame is arranged between the inner walls of the magnet blocking cylinder, the connecting lead is arranged in the magnet blocking cylinder and arranged in the length direction of the magnet blocking cylinder, and the supporting frame limits the connecting lead. According to the low-magnetic-induction lead for the transformer, the magnetic blocking cylinder is arranged outside the connecting lead, when large alternating current passes through the connecting lead, a generated magnetic field forms a large eddy current in the magnetic blocking cylinder, the generated eddy current forms a new magnetic field, the magnetic field generated by the large alternating current is prevented from diffusing outwards, and the magnetic field is blocked in the magnetic blocking cylinder. And more than 95% of magnetic fields can be blocked.

Description

Technical Field

[0001] The invention belongs to the technical field of transformers, and in particular relates to a low magnetic induction lead wire for a transformer. Background Art

[0002] The transformer is a conversion device that uses the principle of electromagnetic induction to change the AC voltage. It is the core component of the power transformation part of the power system. It is mainly composed of an iron core and low-voltage coils and high-voltage coils around the iron core. The large current in the transformer lead will induce eddy current losses in the surrounding metal parts. When the transformer capacity is large and the current is also large, due to the limited space inside the transformer oil tank, the large current lead is close to various metal structural parts. The alternating large current passing through the large current lead will induce very considerable eddy current losses in the metal structural parts of the transformer. The generation of a large amount of eddy current losses will increase the load loss of the transformer and reduce the energy efficiency of the transformer. In addition, when the eddy current losses in the metal structural parts are too concentrated, a large amount of heat will be generated. If the heat dissipation is not timely, it will cause the transformer outlet to overheat locally, and the temperature rise of the transformer will be difficult to control, affecting the safe operation of the transformer. In order to reduce the eddy current losses induced by the large current lead to the surrounding metal structural parts, the main method currently used is to increase the distance between the metal components inside the transformer oil tank and the large current lead, which will increase the size of the transformer, increase the difficulty of transportation, and increase the production cost. Summary of the invention

[0003] The object of the present invention is to provide a low magnetic induction lead wire for a transformer, aiming to solve the problem that a large amount of eddy current loss will be generated by the alternating large current passing through the large current lead wire.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a low magnetic induction lead for a transformer, including a connecting lead and a magnetic shielding assembly, the magnetic shielding assembly including a magnetic shielding cylinder and a support frame, the support frame is arranged between the inner walls of the magnetic shielding cylinder, the connecting lead is arranged in the magnetic shielding cylinder and along the length direction of the magnetic shielding cylinder, and the support frame limits the connecting lead.

[0005] In a possible implementation, the support frames are provided in multiple groups and distributed along the length direction of the magnetic blocking cylinder.

[0006] In one possible implementation, the support frame includes a support ring and a support arm, the axis of the support ring coincides with the axis of the magnetic blocking cylinder, multiple groups of support arms are arranged on the outer wall of the support ring, the other end of the support arm is against the inner wall of the magnetic blocking cylinder, and the connecting lead is passed through the support ring.

[0007] In a possible implementation, the outer wall of the support ring is provided with a fixing arm, and the fixing arm is provided with two groups, which are respectively provided at the upper end and the lower end of the support ring. The fixing arm passes through the magnetic blocking cylinder, and a first fixing hole is provided on the first end of the fixing arm away from the support ring.

[0008] In a possible implementation, a fixing plate is provided on the outer side wall of the magnetic blocking cylinder, the fixing plate is fitted with the side wall of the first end of the fixed arm, a second fixing hole is provided on the fixing plate, and the second fixing hole coincides with the first fixing hole.

[0009] In a possible implementation manner, a lead opening is provided on the support ring.

[0010] In a possible implementation, both ends of the connecting lead are located outside the magnetic blocking cylinder.

[0011] In a possible implementation, both ends of the connecting lead are provided with connecting plates, and the connecting plates are provided with connecting holes.

[0012] In a possible implementation manner, the support frame is made of an electrically insulating material.

[0013] In a possible implementation manner, the magnetic blocking cylinder is made of a conductive material.

[0014] The beneficial effects of the low magnetic induction lead wire for transformer provided by the present invention are: Compared with the prior art, a connecting lead and a magnetic shielding assembly are provided. The magnetic shielding assembly includes a magnetic shielding cylinder and a support frame. The support frame is arranged in the magnetic shielding cylinder, and the connecting lead is passed through the support frame. The connecting lead is arranged along the length direction of the magnetic shielding cylinder, and the connecting lead passes through the magnetic shielding cylinder. The support frame is used to support the connecting lead to avoid displacement of the connecting lead during use. A magnetic shielding cylinder is arranged outside the connecting lead. When a large AC current passes through the connecting lead, the magnetic field generated forms a large eddy current in the magnetic shielding cylinder. The generated eddy current forms a new magnetic field, which prevents the magnetic field generated by the large AC current from spreading outward and blocks the magnetic field in the magnetic shielding cylinder. The low magnetic induction lead can block more than 95% of the magnetic field, has a simple and easy structure, is easy to install, reduces the size of the transformer, and reduces the cost of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the three-dimensional structure of a low magnetic induction lead wire for a transformer provided in an embodiment of the present invention; Figure 2 A schematic diagram of the explosion structure of a low magnetic induction lead for a transformer provided by an embodiment of the present invention; Figure 3 A schematic diagram of the three-dimensional structure of a left fixing plate used in an embodiment of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the support frame adopted in the embodiment of the present invention.

[0017] In the figure: 1. connecting lead; 2. connecting plate; 3. connecting hole; 4. left magnet-blocking half-cylinder; 5. left fixing plate; 6. second left fixing hole; 7. right magnet-blocking half-cylinder; 8. right fixing plate; 9. second right fixing hole; 10. fixing groove; 11. supporting ring; 12. supporting arm; 13. fixing arm; 14. first fixing hole; 15. lead opening. DETAILED DESCRIPTION

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] Please refer to Figures 1 to 4 A specific implementation method of a low magnetic induction lead for a transformer provided by the present invention is now described, including a connecting lead 1 and a magnetic shielding assembly, the magnetic shielding assembly includes a magnetic shielding cylinder and a support frame, the support frame is arranged between the inner walls of the magnetic shielding cylinder, the connecting lead 1 is arranged in the magnetic shielding cylinder and along the length direction of the magnetic shielding cylinder, and the support frame limits the connecting lead 1.

[0020] The present invention provides a low magnetic induction lead for a transformer. Compared with the prior art, the low magnetic induction lead is provided with a connecting lead 1 and a magnetic shielding component. The magnetic shielding component includes a magnetic shielding cylinder and a support frame. The support frame is arranged in the magnetic shielding cylinder. The connecting lead 1 is passed through the support frame. The connecting lead 1 is arranged along the length direction of the magnetic shielding cylinder. The connecting lead 1 passes through the magnetic shielding cylinder. The support frame is used to support the connecting lead 1 to avoid displacement of the connecting lead 1 during use. A magnetic shielding cylinder is arranged outside the connecting lead 1. When a large AC current passes through the connecting lead 1, the magnetic field generated forms a large eddy current in the magnetic shielding cylinder. The generated eddy current forms a new magnetic field, which prevents the magnetic field generated by the large AC current from spreading outward and blocks the magnetic field in the magnetic shielding cylinder. The low magnetic induction lead can block more than 95% of the magnetic field, has a simple and easy structure, is easy to install, reduces the size of the transformer, and reduces the cost of the transformer.

[0021] For details, please refer to Figures 1 to 4, including a connecting lead 1 and a magnetic shielding component, the magnetic shielding component includes a magnetic shielding cylinder and a support frame, the magnetic shielding cylinder includes a left magnetic shielding half cylinder 4 and a right magnetic shielding half cylinder 7, the openings of the left magnetic shielding half cylinder 4 and the right magnetic shielding half cylinder 7 are arranged opposite to each other, the left magnetic shielding half cylinder 4 is buckled on the left side of the right magnetic shielding half cylinder 7, the support frame is arranged between the left magnetic shielding half cylinder 4 and the right magnetic shielding half cylinder 7, the connecting lead 1 passes through the support frame, the support frame supports the connecting lead 1, the connecting lead 1 enters from the first end of the magnetic shielding cylinder and exits from the second end, one end of the connecting lead 1 is connected to the transformer coil output line, the other end of the connecting lead 1 is connected to the transformer lead-out bushing, or is connected to other leads, the magnetic shielding cylinder can be linear or zigzag according to actual usage, matching the internal structure of the transformer.

[0022] As a specific implementation of the low magnetic induction lead wire for transformer provided by the present invention, please refer to Figures 1 to 4 There are multiple groups of support frames distributed along the length direction of the magnetic blocking cylinder.

[0023] For details, please refer to Figures 1 to 4 Multiple groups of support frames are arranged along the length direction of the magnetic blocking cylinder, and the multiple groups of support frames are evenly distributed to increase the stability of supporting the connecting lead 1.

[0024] As a specific implementation of the low magnetic induction lead wire for transformer provided by the present invention, please refer to Figures 1 to 4 The support frame includes a support ring 11 and a support arm 12. The axis of the support ring 11 coincides with the axis of the magnetic blocking cylinder. Multiple groups of support arms 12 are arranged on the outer wall of the support ring 11. The other end of the support arm 12 rests on the inner wall of the magnetic blocking cylinder. The connecting lead 1 is passed through the support ring 11.

[0025] For details, please refer to Figures 1 to 4 The support frame includes a support ring 11 and a support arm 12. The support arm 12 is arranged on the outer wall of the support ring 11. Multiple groups of support arms 12 are radially arranged. The free ends of the support arms 12 are against the inner wall of the left magnetic shielding half cylinder 4 or the right magnetic shielding half cylinder 7. The connecting lead 1 is passed through the support ring 11. The axis of the support ring 11 coincides with the axis of the magnetic shielding cylinder, that is, the connecting lead 1 is located on the axis of the magnetic shielding cylinder, thereby increasing the magnetic shielding effect of the device.

[0026] For further information, please refer to Figures 1 to 4 Three groups of support arms 12 are provided, and the three groups of support arms 12 are evenly distributed on the circumference of the support ring 11, thereby increasing the stability of the support frame supporting the connecting lead 1.

[0027] As a specific implementation of the low magnetic induction lead wire for transformer provided by the present invention, please refer to Figures 1 to 4A fixing arm 13 is provided on the outer wall of the support ring 11. Two groups of fixing arms 13 are provided, which are respectively provided at the upper end and the lower end of the support ring 11. The fixing arm 13 passes through the magnetic blocking cylinder. A first fixing hole 14 is provided on the first end of the fixing arm 13 away from the support ring 11.

[0028] For details, please refer to Figures 1 to 4 The fixed arms 13 are arranged on the outer wall of the support ring 11, one group of fixed arms 13 is arranged directly above the support ring 11, and one group of fixed arms 13 is arranged directly below the support ring 11. The two groups of fixed arms 13 are arranged in the same vertical plane, and the fixed arms 13 pass through between the left magnetic blocking half cylinder 4 and the right magnetic blocking half cylinder 7. The left magnetic blocking half cylinder 4 and the right magnetic blocking half cylinder 7 are each provided with a fixing groove 10 suitable for the fixed arms 13 to pass through. A first fixing hole 14 is provided on the first end of the fixed arm 13 away from the support ring 11, and the first fixing hole 14 facilitates the installation of the device.

[0029] As a specific implementation of the low magnetic induction lead wire for transformer provided by the present invention, please refer to Figures 1 to 4 A fixing plate is provided on the outer side wall of the magnetic blocking cylinder, and the fixing plate is fitted with the side wall of the first end of the fixing arm 13 . A second fixing hole is provided on the fixing plate, and the second fixing hole coincides with the first fixing hole 14 .

[0030] For details, please refer to Figures 1 to 4 , the fixing plate is arranged on the outer wall of the magnetic shielding cylinder, the fixing plate includes a left fixing plate 5 and a right fixing plate 8, the left fixing plate 5 is arranged on the outer wall of the left magnetic shielding semi-cylinder 4, and the right fixing plate 8 is arranged on the outer wall of the right magnetic shielding semi-cylinder 7, the left fixing plate 5 and the right fixing plate 8 are respectively arranged on the left and right sides of the first end of the fixing arm 13, the left fixing plate 5 is arranged in contact with the left side wall of the fixing arm 13, and the right fixing plate 8 is arranged in contact with the right side wall of the fixing arm 13, and a second fixing hole is arranged on the fixing plate, the second fixing hole includes a second left fixing hole 6 and a second right fixing hole 9, the left fixing plate 5 is arranged with a second left fixing hole 6, and the right fixing plate 8 is arranged with a second right fixing hole 9, the second left fixing hole 6 and the second right fixing hole 9 both coincide with the axis of the first fixing hole 14 and have the same inner diameter, and a fixing bolt can be used to simultaneously penetrate the second left fixing hole 6, the first fixing hole 14 and the second right fixing hole 9 to fix the device, thereby increasing the stability of the fixation between the left magnetic shielding semi-cylinder 4, the right magnetic shielding semi-cylinder 7 and the support frame, and increasing the stability of the device fixed in the transformer.

[0031] As a specific implementation of the low magnetic induction lead wire for transformer provided by the present invention, please refer to Figures 1 to 4 A lead opening 15 is provided on the support ring 11 .

[0032] For details, please refer to Figures 1 to 4A lead opening 15 is provided on the side wall of the support ring 11, and the lead opening 15 is provided at the upper right side of the support ring 11. When assembling the device, the left half of the support ring 11 is installed in the left magnet-blocking half-cylinder 4, and the support frame is temporarily fixed with the help of the left fixing plate 5. Under the action of the lead opening 15, it is convenient for the connecting lead 1 to pass through the support ring 11. After the connecting lead 1 passes through the support ring 11, the right magnet-blocking half-cylinder 7 is buckled on the right side of the left magnet-blocking half-cylinder 4, and the installation of the right magnet-blocking half-cylinder 7 is limited with the help of the right fixing plate 8.

[0033] As a specific implementation of the low magnetic induction lead wire for transformer provided by the present invention, please refer to Figures 1 to 4 , both ends of the connecting lead 1 are located outside the magnetic blocking cylinder.

[0034] For details, please refer to Figures 1 to 4 Both ends of the connecting lead 1 pass through the openings at both ends of the magnetic blocking cylinder, which facilitates the connection of the connecting lead 1 with other components.

[0035] As a specific implementation of the low magnetic induction lead wire for transformer provided by the present invention, please refer to Figures 1 to 4 Both ends of the connecting lead 1 are provided with connecting plates 2, and the connecting plates 2 are provided with connecting holes 3.

[0036] For details, please refer to Figures 1 to 4 Two groups of connecting plates 2 are respectively arranged at the two ends of the connecting lead 1, and multiple groups of connecting holes 3 are arranged on the connecting plate 2 to facilitate the connection of the connecting lead 1 with other components.

[0037] As a specific implementation of the low magnetic induction lead wire for transformer provided by the present invention, please refer to Figures 1 to 4 , the support frame is made of electrically insulating material.

[0038] For details, please refer to Figures 1 to 4 The support frame is made of an electrically insulating material to insulate the connecting lead 1 from the magnetic blocking cylinder.

[0039] As a specific implementation of the low magnetic induction lead wire for transformer provided by the present invention, please refer to Figures 1 to 4 , the magnetic blocking cylinder is made of conductive material.

[0040] For details, please refer to Figures 1 to 4 The magnetic shielding tube is made of conductive material. When a large AC current passes through the connecting lead 1, the magnetic field generated forms a large eddy current in the magnetic shielding tube. The generated eddy current forms a new magnetic field, which prevents the magnetic field generated by the large AC current from spreading outward and blocks the magnetic field in the magnetic shielding tube. The excellent conductivity of the magnetic shielding tube can increase the magnetic shielding effect of the device.

[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low magnetic induction lead wire for a transformer, characterized in that: It includes a connecting lead and a magnet blocking assembly, the magnet blocking assembly includes a magnet blocking cylinder and a support frame, the support frame is arranged between the inner walls of the magnet blocking cylinder, the connecting lead is arranged in the magnet blocking cylinder and along the length direction of the magnet blocking cylinder, and the support frame limits the connecting lead.

2. A low magnetic induction lead wire for a transformer as claimed in claim 1, characterized in that: The support frames are provided in multiple groups and distributed along the length direction of the magnetic blocking cylinder.

3. A low magnetic induction lead wire for a transformer as claimed in claim 1, characterized in that: The support frame includes a support ring and a support arm. The axis of the support ring coincides with the axis of the magnetic blocking cylinder. Multiple groups of support arms are arranged on the outer wall of the support ring. The other end of the support arm rests on the inner wall of the magnetic blocking cylinder. The connecting lead is passed through the support ring.

4. A low magnetic induction lead wire for a transformer as claimed in claim 3, characterized in that: The outer wall of the support ring is provided with a fixing arm, and the fixing arm is provided with two groups, which are respectively provided at the upper end and the lower end of the support ring. The fixing arm passes through the magnetic blocking cylinder, and a first fixing hole is provided on the first end of the fixing arm away from the support ring.

5. A low magnetic induction lead wire for a transformer as claimed in claim 4, characterized in that: A fixing plate is disposed on the outer side wall of the magnetic blocking cylinder, and the fixing plate is fitted with the side wall of the first end of the fixing arm. A second fixing hole is disposed on the fixing plate, and the second fixing hole overlaps with the first fixing hole.

6. A low magnetic induction lead wire for a transformer as claimed in claim 3, characterized in that: The support ring is provided with a lead wire opening.

7. A low magnetic induction lead wire for a transformer as claimed in claim 1, characterized in that: Both ends of the connecting lead are located outside the magnetic blocking cylinder.

8. A low magnetic induction lead wire for a transformer as claimed in claim 7, characterized in that: Both ends of the connecting lead are provided with connecting plates, and the connecting plates are provided with connecting holes.

9. A low magnetic induction lead wire for a transformer as claimed in claim 1, characterized in that: The support frame is made of electrical insulating material.

10. The low magnetic induction lead wire for transformer according to claim 1, characterized in that: The magnetic blocking cylinder is made of conductive material.

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