Transformer iron core drawstring plate structure with shielding function

Abstract

The invention relates to the technical field of transformers, in particular to a transformer iron core drawstring plate structure with a shielding function, which comprises an iron core drawstring plate and further comprises a fixing plate fixedly arranged on the outer side of the iron core drawstring plate, and an iron core drawstring end fastener is arranged in the iron core drawstring plate in a penetrating manner. The end parts and the edges of the iron core drawstring plate and the fixed plate are of chamfer structures; all the edges of the drawstring plate formed after the iron core drawstring plate and the fixing plate are welded are chamfered, the sharp right-angle edge is converted into a smooth transition arc, the electric field intensity around the drawstring plate can be remarkably reduced, excessive concentration of the field intensity is avoided, the fixing plate with the specific size is welded to the outer side of the iron core drawstring plate with the original thickness, and the production efficiency is improved. The thickness of the drawstring plate is increased, the groove of the fixing plate and the installation groove of the iron core drawstring plate form a stepped shielding body, and an iron core drawstring end fastening piece is completely arranged in the drawstring plate and is not exposed in an external electric field any more.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and in particular to a transformer core pull plate structure with shielding function. Background Technology

[0002] Core tension plates are widely used in power transformers and large reactors. They are key support components for securing power transformers, and their design directly affects the electrical performance and operational reliability of the equipment.

[0003] Most existing pull plates currently have sharp edges. In high-voltage electrical equipment, any sharp metal edge will cause electric field distortion. The edges of traditional thick pull plate structures are usually right angles, and the pull fasteners are exposed to the external electric field, making them a prominent "electrode tip". When the equipment is running, partial discharge is very likely to occur near these tips. Long-term partial discharge will gradually erode the insulation material, and in severe cases, it will cause serious faults such as insulation breakdown, resulting in economic losses due to product repair or return to the factory.

[0004] Therefore, to address the above problems, a transformer core pull plate structure with shielding function can be designed. By chamfering all the edges of the pull plate, the sharp right-angled edges are transformed into smooth transition arcs, which can significantly reduce the electric field strength around the pull plate and avoid excessive concentration of field strength. Summary of the Invention

[0005] To overcome the problem that protruding parts of the transformer core pull plate can easily lead to partial discharge.

[0006] The technical solution of the present invention is as follows: a transformer core pull plate structure with shielding function, including a core pull plate and a fixing plate fixedly disposed on the outside of the core pull plate. The core pull plate is provided with a core pull end fastener through it. The ends and edges of the core pull plate and the fixing plate are all chamfered.

[0007] Preferably, by chamfering all edges of the pull plate formed after welding the core pull plate and the fixing plate, the sharp right-angled edges are transformed into smooth-transitioned arcs, which can significantly reduce the electric field strength around the pull plate and avoid excessive concentration of field strength.

[0008] Preferably, the core tension plate is welded to the fixing plate, the fixing plate has a groove inside, and the core tension plate has a pre-reserved mounting groove inside, with the groove and the mounting groove corresponding to each other.

[0009] Preferably, the groove and the mounting slot form a stepped shield.

[0010] Preferably, the core pull strip end fastener passes through the groove and the mounting groove, and the tail end of the core pull strip end fastener is located inside the groove.

[0011] The beneficial effects of this invention are: 1. By chamfering all the edges of the core drawing plate formed after welding the core drawing plate and the fixing plate, the sharp right-angled edges are transformed into smooth-transitioned arcs, which can significantly reduce the electric field strength around the drawing plate and avoid excessive concentration of field strength. 2. By welding a fixed plate of a specific size to the outside of the original thickness iron core pull plate, the thickness of the pull plate is increased. The groove of the fixed plate and the mounting groove of the iron core pull plate form a stepped shield, which completely embeds the iron core pull end fasteners inside the pull plate and no longer exposes them to the external electric field, thus avoiding partial discharge problems. Attached Figure Description

[0012] Figure 1 The image shown is a front view of the transformer core pull plate structure with shielding function according to the present invention; Figure 2 The image shown is a side view of the transformer core pull plate structure with shielding function according to the present invention. Figure 3 The image shown is a top view of the shielded transformer core pull plate structure ring blade of the present invention.

[0013] Explanation of reference numerals in the attached drawings: 1. Iron core pull plate; 2. Fixing plate; 3. Iron core pull end fastener; 4. Groove; 5. Mounting groove. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Example 1: This application can actually solve the problem that the right angle of the edge of the pull plate structure can easily cause partial discharge, based on the chamfering of the edge of the pull plate structure and the built-in fastener of the iron core pull plate end; In this embodiment, according to Figure 1 , Figure 2 and Figure 3 As shown, it includes a core tension plate 1 and a fixing plate 2 fixedly disposed on the outside of the core tension plate 1. A core tension end fastener 3 is disposed through the inside of the core tension plate 1. The ends and edges of the core tension plate 1 and the fixing plate 2 are all chamfered.

[0016] By rounding all edges, including the four sharp corners, of the core drawing plate 1 and the fixing plate 2 after welding, the chamfered transformer forms an approximately equipotential surface, smoothing the distribution of electric field lines and making the electric field distribution around the drawing plate more uniform, similar to a shielding electrode. This measure is the core measure to improve the electric field distribution. Transforming the sharp right-angled edges into smooth-transitioned arcs can significantly reduce the electric field intensity at the core drawing plate, avoid excessive charge accumulation, and extend the service life of high-voltage equipment.

[0017] Furthermore, the core pull plate 1 is welded and fixed to the fixing plate 2. The fixing plate 2 has a groove 4 inside, and the core pull plate 1 has a reserved installation groove 5 inside. The groove 4 and the installation groove 5 are corresponding in position, and the groove 4 and the installation groove 5 form a stepped shield. The core pull end fastener 3 passes through the groove 4 and the installation groove 5, and the tail end of the core pull end fastener 3 is located inside the groove 4.

[0018] On the outside of the conventional thick iron core pull plate 1, a fixed plate 2 of a specific size is welded. This design increases the total thickness of the iron core pull plate 1, forming a stepped shield. Increasing the thickness of the iron core pull plate 1 allows the iron core pull end fastener 3 to be completely built into the inside of the thickened pull plate groove 4, no longer exposed to the external electric field. This fundamentally eliminates the problem of electric field concentration points being generated when a charged body is near the exposed fastener because there are no sharp points for discharge. This effectively achieves electrostatic shielding.

[0019] Working principle: By welding the core pull plate 1 to the fixing plate 2, the thickness of the core pull plate 1 is increased. All edges of the pull plate formed by the welded core pull plate 1 and the fixing plate 2, including the four sharp corners, are rounded. The chamfered transformer forms an approximately equipotential surface, which smooths the distribution of electric lines. The core pull end fastener 3 passes through the groove 4 and the mounting groove 5 to the core pull plate 1. The tail end of the core pull plate 1 is located inside the groove 4, so that it is not exposed to the external electric field. Since there are no sharp points to discharge, the generation of electric field concentration points is avoided, effectively realizing electrostatic shielding and preventing partial discharge.

[0020] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A transformer core tensioning plate structure with shielding function, comprising a core tensioning plate (1), characterized in that: It also includes a fixing plate (2) fixedly installed on the outside of the core pull plate (1), and a core pull end fastener (3) is installed through the inside of the core pull plate (1). The ends and edges of the core pull plate (1) and the fixing plate (2) are all chamfered.

2. The transformer core tension plate structure with shielding function according to claim 1, characterized in that: The core pull plate (1) is welded and fixed to the fixing plate (2). The fixing plate (2) has a groove (4) inside. The core pull plate (1) has a reserved installation groove (5) inside. The groove (4) and the installation groove (5) are corresponding to each other.

3. The transformer core tension plate structure with shielding function according to claim 2, characterized in that: The groove (4) and the mounting groove (5) form a stepped shield.

4. The transformer core tension plate structure with shielding function according to claim 3, characterized in that: The core pull belt end fastener (3) passes through the groove (4) and the mounting groove (5), and the tail end of the core pull belt end fastener (3) is located inside the groove (4).

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