Electromagnetic voltage transformer

Abstract

The utility model relates to the technical field of electromagnetic voltage transformers, and particularly discloses an electromagnetic voltage transformer which comprises an iron core and a winding wound on the iron core, the contact position of the winding and the iron core is insulated, and the whole iron core is arranged in a shape like a Chinese character'ri '. The winding is arranged on a middle core column of the B-shaped iron core; the iron core comprises two square iron cores which are arranged side by side; the two square-shaped iron cores are tightly attached to each other; each square iron core comprises two U-shaped iron cores; the opening ends of the two U-shaped iron cores are oppositely arranged; and an insulating spacer is arranged between the end parts of the two U-shaped iron cores. Compared with the prior art, through the reasonably arranged iron core, the nonlinear excitation characteristic of the magnetic circuit is improved, the ferromagnetic resonance is inhibited, the installation is simple, the occupied space is reduced, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic voltage transformers, and specifically discloses an electromagnetic voltage transformer. Background Art

[0002] Ferromagnetic resonance of electromagnetic voltage transformers is an electrical phenomenon, mainly formed by the resonance of the iron core inductance element (such as an electromagnetic voltage transformer) and the capacitance element of the power system (such as a transmission line, a capacitor compensator, etc.) under specific conditions, thereby exciting continuous ferromagnetic resonance. This resonance will cause the system to generate resonance overvoltage, which poses a threat to the safe and stable operation of the power system.

[0003] Ferromagnetic resonance may cause the high-voltage fuse to blow, the transformer to spray oil and smoke, and even burn out the transformer, resulting in system shutdown. In order to avoid such serious consequences, effective measures must be taken to suppress and eliminate ferromagnetic resonance overvoltage.

[0004] The existing methods for preventing ferromagnetic resonance in electromagnetic voltage transformers mainly include connecting a damper to the residual voltage winding of the electromagnetic voltage transformer, connecting a high impedance to the neutral point of the transformer, or replacing it with a capacitive electromagnetic voltage transformer. The above methods make the installation of the electromagnetic voltage transformer cumbersome, occupy a large space, and have a high cost. Summary of the Utility Model

[0005] Aiming at the above deficiencies of the prior art, the utility model provides an electromagnetic voltage transformer to solve the problems of cumbersome installation, large space occupation, and high cost.

[0006] To achieve the above purpose, the technical solution of the utility model is as follows:

[0007] An electromagnetic voltage transformer includes an iron core and windings wound around the iron core. The contact between the windings and the iron core is insulated. The iron core is integrally arranged in a "day" shape. The windings are arranged on the middle core column of the "day" shape of the iron core. The iron core includes two "mouth" - shaped iron cores arranged side by side. The two "mouth" - shaped iron cores are closely arranged. Each "mouth" - shaped iron core includes two "U" - shaped iron cores. The open ends of the two "U" - shaped iron cores are arranged opposite to each other. An insulating gasket is arranged between the ends of the two "U" - shaped iron cores. It improves the non - linear excitation characteristics of the magnetic circuit, suppresses ferromagnetic resonance, has a simple installation, reduces space occupation, and lowers the cost.

[0008] Preferably, an insulating tie - strap is wound around the outside of the iron core to ensure the structural stability of the iron core.

[0009] Preferably, end insulating plates are arranged at both ends of the windings.

[0010] Preferably, the windings include a primary winding and a secondary winding. The primary winding is sleeved on the secondary winding. Insulation is arranged between the primary winding and the secondary winding.

[0011] Preferably, the secondary winding is wound on the second insulating cylinder; the second insulating cylinder is sleeved on the middle core column of the iron core in the shape of a Chinese sigma.

[0012] Preferably, the primary winding is wound on an insulating cylinder; and an insulating cylinder set is arranged on the secondary winding.

[0013] Preferably, interlayer insulating paper is provided between layers of the primary winding and the secondary winding.

[0014] The beneficial effects of the utility model are as follows: the nonlinear excitation characteristics of the magnetic circuit are improved, ferromagnetic resonance is suppressed, installation is simple, space occupation is reduced, and cost is reduced through the rationally arranged iron core. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 for Figure 1 A schematic diagram of a top view structure;

[0018] Figure 3 for Figure 2 Schematic diagram of the AA section view.

[0019] Description of reference numerals:

[0020] 1- U-shaped iron core, 2-insulating gasket, 3-end insulating plate, 4-primary winding, 5-secondary winding, 6-insulating tube 2, 7-insulating tube 1, 8-interlayer insulating paper, 9-insulating tie, 10-primary winding lead wire, 11-secondary winding lead wire; 101- U-shaped iron core. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0022] like Figure 1-3As shown in the figure, an electromagnetic voltage transformer includes an iron core and windings wound around the iron core. The contact between the windings and the iron core is insulated, and the iron core is in an "R" shape as a whole. The windings are arranged on the middle core column of the "R" shape of the iron core. The iron core includes two "口"-shaped iron cores 1 arranged side by side; the two "口"-shaped iron cores 1 are closely arranged; each "口"-shaped iron core 1 includes two "凵"-shaped iron cores 101; the open ends of the two "凵"-shaped iron cores 101 are arranged opposite to each other; an insulating gasket 2 is arranged between the ends of the two "凵"-shaped iron cores 101. Insulating tie straps 9 are wound around the outside of the iron core to ensure the structural stability of the iron core.

[0023] In the above setting, end insulating plates 3 are arranged at both ends of the windings. The windings include a primary winding 4 and a secondary winding 5; the primary winding 4 is sleeved on the secondary winding 5; the primary winding 4 and the secondary winding 5 are insulated from each other. The secondary winding 5 is wound around an insulating cylinder two 6; the insulating cylinder two 6 is sleeved on the middle core column of the "R" shape of the iron core. The insulation setting at the contact between the windings and the iron core is completed. The primary winding 4 is wound around an insulating cylinder one 7; the insulating cylinder one 7 is sleeved on the secondary winding 5. Interlayer insulating paper 8 is arranged between the layers of the primary winding 4 and the secondary winding 5. One end of the primary winding lead 10 of the primary winding 4 is led out to one side of the iron core, and the other end is led out above the iron core. The secondary winding lead 11 of the secondary winding 5 is led out to one side of the iron core and is adjacent to one end of the primary winding lead 10.

[0024] Through the reasonably arranged iron core, the non-linear excitation characteristics of the magnetic circuit are improved, the installation is simple, the space occupation is reduced, and the cost is lowered.

[0025] Although the present utility model has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present utility model is not limited thereto. Without departing from the spirit and essence of the present utility model, those of ordinary skill in the art can make various equivalent modifications or substitutions to the embodiments of the present utility model, and all such modifications or substitutions should be within the scope of the present utility model. / Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. An electromagnetic voltage transformer, comprising an iron core and a winding wound on the iron core, wherein the contact between the winding and the iron core is insulated, characterized in that: The iron core is integrally arranged in a "ri" shape; the winding is arranged on the middle core column of the "ri" shape of the iron core; the iron core includes two "kou" - shaped iron cores (1) arranged side by side; the two "kou" - shaped iron cores (1) are closely arranged; each "kou" - shaped iron core (1) includes two "凵" - shaped iron cores (101); the open - end sides of the two "凵" - shaped iron cores (101) are arranged opposite to each other; an insulating gasket (2) is arranged between the ends of the two "凵" - shaped iron cores (101).

2. The electromagnetic voltage transformer according to claim 1, characterized in that: An insulating tie - strap (9) is wound around the outside of the iron core.

3. The electromagnetic voltage transformer according to claim 2, characterized in that: End insulating plates (3) are arranged at both ends of the winding.

4. The electromagnetic voltage transformer according to claim 3, characterized in that: The winding includes a primary winding (4) and a secondary winding (5); the primary winding (4) is sleeved on the secondary winding (5); insulation is provided between the primary winding (4) and the secondary winding (5).

5. The electromagnetic voltage transformer according to claim 4, characterized in that: The secondary winding (5) is wound around an insulating cylinder two (6); the insulating cylinder two (6) is sleeved on the middle core column of the "ri" - shaped iron core.

6. The electromagnetic voltage transformer according to claim 5, characterized in that: The primary winding (4) is wound around an insulating cylinder one (7); the insulating cylinder one (7) is sleeved on the secondary winding (5).

7. The electromagnetic voltage transformer according to claim 6, characterized in that: Inter - layer insulating paper (8) is arranged between the layers of the primary winding (4) and the secondary winding (5).

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