Low-loss, local overheating-free reactor or transformer internal electromagnetic field shielding structure
Patent Information
- Application Number
- CN202522135016.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-10
- Publication Date
- 2026-09-15
- Estimated Expiration
- 2035-10-10
AI Technical Summary
[0004]针对现有技术中的不足，本实用新型提供一种低损耗、无局部过热电抗器或变压器内部电磁场屏蔽结构，主要解决电抗器、变压器内部，铁心和线圈等部位电磁场集中引起局放、附加损耗增大和局部过热等问题，提高电抗器、变压器的运行安全和寿命
[0011] The beneficial effects of this utility model are: the low-loss, non-locally overheating electromagnetic field shielding structure inside the reactor or transformer mainly solves the problems of partial discharge, increased additional losses and local overheating caused by the concentration of electromagnetic fields in parts such as the core and coils inside the reactor or transformer, thereby improving the operating safety and lifespan of the reactor or transformer.
Smart Images
Figure CN224759245U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power transmission and distribution technology, specifically to a low-loss, non-overheating electromagnetic field shielding structure inside a reactor or transformer. Background Technology
[0002] With social and economic development, the power industry has increasingly stringent requirements for the safety of power transmission and consumption. Reactors and transformers are among the main equipment for power transmission and consumption, playing a crucial role in the safe operation of the power system. In the power system, even a reactor or transformer that has passed routine testing often experiences quality accidents during operation. Partial discharge and localized overheating are among the most important causes of insulation damage. The "electrochemical corrosion" caused by partial discharge and localized overheating of the product leads to the cumulative effect of insulation aging, reduced insulation capacity, and even failure, ultimately resulting in breakdown and product burnout.
[0003] The electrical components of the reactor and transformer structure mainly consist of: body insulation, coils, core, and electromagnetic shielding. The reactor and transformer cores are generally made of stacked silicon steel sheets, typically around 0.3mm thick. This results in sharp corners in each core, leading to concentrated electric fields and partial discharge. The reactor core columns are generally composed of iron discs and non-magnetic gaps. Each disc is prone to floating potentials. Especially given the high leakage and diffraction magnetic fields of the reactor, eddy currents are easily generated in the surrounding components and coil conductors, increasing product losses and causing localized overheating, thus affecting the safe operation of the product. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides a low-loss, non-locally overheating electromagnetic field shielding structure for reactors or transformers. It mainly solves the problems of partial discharge, increased additional losses, and localized overheating caused by electromagnetic field concentration in parts such as the core and coils inside reactors and transformers, thereby improving the operational safety and lifespan of reactors and transformers.
[0005] To reduce the influence of electric and magnetic fields between reactors, transformer cores, and coils, the conventional approach is to increase the insulation distance, which increases costs. Reactors, in particular, not only have large leakage magnetic fields, but also exhibit diffracted magnetic flux at the gaps in the iron columns, easily leading to increased eddy current losses in surrounding components and coil conductors, and are prone to localized overheating. This invention, both theoretically and practically, demonstrates excellent effectiveness and application value.
[0006] This utility model is achieved through the following technical solution: This utility model provides a low-loss, non-overheating electromagnetic field shielding structure for the internal electromagnetic field of a reactor or transformer, including an insulator body, an iron core, and a coil. The coil is sleeved outside the iron core and is made of electromagnetic wire. The iron core is made of stacked silicon steel sheets. It also includes an electromagnetic field shielding component, which is sleeved between the iron core and the coil and close to the iron core side. The component includes an insulating plate and several copper or aluminum strips fixed to the outer wall of the insulating plate. There is a certain electrical distance between two adjacent copper or aluminum strips, and one end of the copper or aluminum strip is electrically disconnected, while the other end is electrically connected and grounded.
[0007] The principle behind electromagnetic field shielding structures is based on the fact that the eddy current loss generated by the magnetic field is proportional to the bisector of the area perpendicularly entering the conductor, i.e., P... A 2 To address the eddy current losses and localized overheating caused by the magnetic field within the shield, the shield is divided into several small, strip-shaped copper or aluminum strips, with electrical gaps between them, positioned between the core and the coil. Based on this principle, the eddy current losses generated by the electromagnetic field entering the shield perpendicularly decrease exponentially, significantly reducing magnetic field losses and overheating within the shield. One end of the copper or aluminum strip is electrically disconnected to prevent circulating currents, while the other end is electrically connected and grounded to prevent floating potential. The copper or aluminum strip and the core are at the same electrical potential.
[0008] Preferably, the insulating panel is made of 0.5-1mm insulating paperboard, or other insulating materials.
[0009] Preferably, the copper or aluminum strip has a thickness of 0.05-0.1 mm, a width of 20-30 mm, and a gap of 3-5 mm between adjacent copper or aluminum strips, which can achieve a better shielding effect.
[0010] Preferably, one end of the copper or aluminum strip is electrically disconnected, and the other end is connected to the ground via an electrical connection conductor to avoid floating potential and to ensure that the copper or aluminum strip and the iron core are at the same potential.
[0011] The beneficial effects of this utility model are: the low-loss, non-locally overheating electromagnetic field shielding structure inside the reactor or transformer mainly solves the problems of partial discharge, increased additional losses and local overheating caused by the concentration of electromagnetic fields in parts such as the core and coils inside the reactor or transformer, thereby improving the operating safety and lifespan of the reactor or transformer. Attached Figure Description
[0012] Figure 1 This is a front view of the electromagnetic field shielding structure inside the low-loss reactor or transformer without local overheating of this utility model. Figure 2This is a top view of the low-loss, no-local-overheating reactor or transformer internal electromagnetic field shielding structure of this utility model. Figure 3 This is a front view of the electromagnetic field shielding component of this utility model. Detailed Implementation
[0013] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of the present invention.
[0014] like Figure 1-3 The low-loss, locally overheat-free electromagnetic field shielding structure inside the reactor or transformer shown includes the reactor or transformer insulator body, iron core 2, and coil 1. The coil 1 is sleeved outside the iron core 2 and is made of electromagnetic wire. The iron core 2 is made of stacked silicon steel sheets. It also includes an electromagnetic field shielding component. The electromagnetic field shielding component is sleeved between the iron core 2 and the coil 1 and close to the side of the iron core 2. It includes an insulating plate 4 and several copper strips or aluminum strips 5 fixed to the outer wall of the insulating plate 4. There is a certain electrical distance between two adjacent copper strips or aluminum strips 5, and one end of the copper strip or aluminum strip 5 is electrically disconnected, and the other end is electrically connected and grounded.
[0015] Specifically, the insulating enclosure 4 is an auxiliary material that serves as a skeleton to which the copper strip or aluminum strip 5 is fixed. It can be made of insulating paperboard or other insulating materials such as 0.5-1mm thick insulating paperboard. The copper strip or aluminum strip 5 is fixed to the insulating enclosure 1. The thickness of the copper strip or aluminum strip 5 is 0.05-0.1mm, the width a of the copper strip or aluminum strip 5 is 20-30mm, and the gap b between two adjacent copper strips or aluminum strips 5 is 3-5mm. Several copper or aluminum strips are electrically disconnected at their top 6 and electrically connected to conductor 3 at their bottom 7.
[0016] This invention mainly solves the problems of partial discharge, increased additional losses and local overheating caused by electromagnetic field concentration in parts such as the core and coils inside reactors and transformers, thereby improving the operational safety and lifespan of reactors and transformers.
[0017] The embodiments described above merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.
Claims
1. A low-loss, no local overheating, internal electromagnetic field shielding structure of a reactor or transformer, said reactor or transformer comprising an insulating body, a core and a coil, said coil being sleeved outside the core, the coil being wound by an electromagnetic wire, and the core being stacked by silicon steel sheets, characterized in that: It also includes an electromagnetic field shielding component, which is sleeved between the iron core and the coil and close to the iron core side. It includes an insulating plate and several copper or aluminum strips fixed to the outer wall of the insulating plate. There is a certain electrical distance between two adjacent copper or aluminum strips, and one end of the copper or aluminum strip is electrically disconnected, while the other end is electrically connected and grounded. 2. The low-loss, locally overheat-free electromagnetic field shielding structure inside the reactor or transformer according to claim 1, characterized in that: The insulating panel is made of insulating paperboard with a thickness of 0.5-1mm.
3. The low-loss, locally overheat-free electromagnetic field shielding structure inside the reactor or transformer according to claim 1, characterized in that: The copper or aluminum strip has a thickness of 0.05-0.1 mm, a width of 20-30 mm, and a gap of 3-5 mm between two adjacent copper or aluminum strips.
4. The low-loss, locally overheat-free electromagnetic field shielding structure inside the reactor or transformer according to claim 1, characterized in that: One end of the copper or aluminum strip is electrically disconnected, and the other end is connected to the ground via an electrical connection conductor.