Shielding device for measuring direct current resistance of electric reactor

Abstract

The utility model discloses a shielding device for measuring direct current resistance of a reactor, and relates to the technical field of induction electric shielding. The shielding device for measuring the direct-current resistance of the electric reactor is of a cylindrical cover body structure, the cylindrical cover body structure comprises a plurality of structural layers, the top of the cylindrical cover body structure is sealed, and the bottom is open; the shielding device for measuring the direct-current resistance of the electric reactor can cover the electric reactor and the electric reactor direct-current resistance measuring device through the bottom opening, so that the electric reactor is in a sealed state during direct-current resistance measurement. When the direct-current resistance of the reactor is measured, the shielding device for measuring the direct-current resistance of the reactor covers the reactor and a reactor direct-current resistance measuring device, so that the reactor is in a sealed state during direct-current resistance measurement, the interference of an external electric field and a magnetic field is avoided, and the accuracy of a direct-current resistance measuring result of the high-voltage reactor is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to induction electric shielding technical field, especially in a kind of shielding device for measuring the direct current resistance of electric reactor. BACKGROUND

[0002] At present, the direct current resistance and loop resistance testing device commonly used do not have induction electric shielding protection device. However, in the process of using in the field, especially in 500kV substation, the 35kV high-voltage electric reactor of 500kV main transformer low-voltage side is in the running state when measuring the direct current resistance, and the induction electric of weak coupling is about 800V. This induction electric exceeding the limit of human body can greatly affect the direct current resistance measurement of electric reactor, and directly affect the accuracy of measurement results. UTILITY MODEL CONTENT

[0003] To solve the above problems, the utility model provides a kind of shielding device for measuring the direct current resistance of electric reactor, shielding induction signal interference by the shielding device for measuring the direct current resistance of electric reactor, to improve the accuracy of high-voltage electric reactor direct current resistance measurement results.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A shielding device for measuring the direct current resistance of electric reactor, the shielding device for measuring the direct current resistance of electric reactor is cylindrical cover structure, cylindrical cover structure includes multiple layers of structure layer, its top is sealed, and the bottom is open;The shielding device for measuring the direct current resistance of electric reactor can cover electric reactor and electric reactor direct current resistance measuring device through the bottom opening, so that electric reactor is in a sealed state when measuring direct current resistance.

[0006] Further, the structure layer of the cylindrical cover structure includes a high-conductivity metal layer, a middle insulating layer, a high-magnetic-permeability magnetic shielding layer and an internal insulating layer;The high-conductivity metal layer, the middle insulating layer, the high-magnetic-permeability magnetic shielding layer and the internal insulating layer are arranged layer by layer from the outside to the inside of the cylindrical cover structure.

[0007] Further, the high-conductivity metal layer, the middle insulating layer, the high-magnetic-permeability magnetic shielding layer and the internal insulating layer are all cylindrical covers with sealed top and open bottom.

[0008] Further, the outer edge of the bottom opening of the cylindrical cover structure is provided with a connecting lug plate, and the number of the connecting lug plate is several, and the connecting lug plate is arranged in a circular pattern around the center of the cylindrical cover structure.

[0009] Further, the connecting lug plate is a rectangular plate body, one side of which is fixedly connected or integrally formed with the cylindrical cover structure, and a via hole through which a cooperating bolt passes is provided on the connecting lug plate;The cylindrical cover structure can be bolted to the bottom plate of the electric reactor through the connecting lug plate.

[0010] The shielding device for measuring DC resistance of the electric reactor has the following beneficial effects:

[0011] When the electric reactor is measured for DC resistance, the shielding device for measuring DC resistance of the electric reactor is covered on the electric reactor and the electric reactor DC resistance measuring device, so that the electric reactor is in a sealed state during the DC resistance measurement, thereby avoiding external electric field and magnetic field interference and improving the accuracy of the high-voltage electric reactor DC resistance measurement result.

[0012] The shielding device for measuring DC resistance of the electric reactor has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0014] Figure 1 The overall structure of the shielding device for measuring DC resistance of the electric reactor is shown in the figure.

[0015] Figure 2 The cross-sectional view of the shielding device for measuring DC resistance of the electric reactor is shown in the figure.

[0016] In the figure: 1, cylindrical cover structure; 2, opening; 3, high-conductivity metal layer; 4, middle insulating layer; 5, high-permeability magnetic shielding layer; 6, internal insulating layer; 7, connecting lug; 8, via hole. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments.

[0018] Therefore, the following detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but merely represents some embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application. It should be noted that the embodiments in the present application and the features and technical solutions in the embodiments can be combined with each other without conflict, and attention should be paid to: similar reference numerals and letters represent similar items in the following drawings, so that once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0019] In view of the problem that the measurement result is inaccurate due to induced electricity when measuring the direct current resistance of the electric reactor, the present embodiment provides a shielding device for measuring direct current resistance of electric reactor. Figure 1 and Figure 2 As shown in the drawings, the shielding device for measuring direct current resistance of electric reactor is a cylindrical cover structure 1, the top of which is sealed, the bottom of which is provided with an opening 2, the inside of which forms a cavity, the size of the cavity meets the installation of the electric reactor and the direct current resistance measuring device of the electric reactor, and the opening 2 at the bottom is set according to the size of the electric reactor. The shielding device for measuring direct current resistance of electric reactor can cover the electric reactor and the direct current resistance measuring device of the electric reactor through the opening 2 at the bottom, so that the electric reactor is in a sealed state during direct current resistance measurement, thereby avoiding the influence of induced electricity on the direct current resistance measurement of the electric reactor.

[0020] Further, considering the connection problem of the shielding device for measuring direct current resistance of electric reactor and the electric reactor, as shown in Figure 1 and Figure 2 In the present embodiment, a plurality of connecting lug plates 7 are arranged on the outer edge of the opening 2 at the bottom of the cylindrical cover structure 1, and the connecting lug plates 7 are arranged in a circular manner around the cylindrical cover structure 1. The connecting lug plate 7 is a rectangular plate body, one side of the connecting lug plate 7 is fixedly connected with the cylindrical cover structure 1 or the connecting lug plate 7 is integrally formed with the cylindrical cover structure 1, and the connecting lug plate 7 is provided with a through hole 8 through which a cooperating bolt passes, so that the cylindrical cover structure 1 can be bolted to the bottom plate of the electric reactor through the connecting lug plate 7. The installation of the shielding device for measuring direct current resistance of electric reactor is carried out during the direct current resistance measurement of the electric reactor, and the shielding device for measuring direct current resistance of electric reactor is removed after the measurement is completed.

[0021] Further, since the induced electricity shielding mainly includes electric field shielding and magnetic field shielding, the cylindrical cover structure 1 in the present embodiment includes a plurality of structural layers; as shown in Figure 2As shown, the structure layer of the cylindrical cover structure 1 includes a high-conductivity metal layer 3, a middle insulation layer 4, a high-permeability magnetic shielding layer 5, and an internal insulation layer 6; the high-conductivity metal layer 3, the middle insulation layer 4, the high-permeability magnetic shielding layer 5, and the internal insulation layer 6 are arranged layer by layer from the outside to the inside of the cylindrical cover structure 1. The high-conductivity metal layer 3, the middle insulation layer 4, the high-permeability magnetic shielding layer 5, and the internal insulation layer 6 are all cylindrical covers with the top sealed and the bottom open.

[0022] The high-conductivity metal layer 3 is made of high-conductivity metal materials such as copper Cu or aluminum Al, which mainly provides effective electric field shielding to reduce the influence of induced voltage on measurement results. At the same time, it can guide the induced current to the ground through good conductivity, thereby protecting the safety of test equipment and operating personnel.

[0023] The middle insulation layer 4 is made of polymer materials (such as polyethylene, polyvinyl chloride, etc.) or ceramic materials, which have good insulation performance. This layer serves to isolate the electrical connection between the high-conductivity metal layer 3 and the high-permeability magnetic shielding layer 5, preventing short circuits, while providing certain mechanical strength and stability to ensure the reliability of the shielding device in complex environments.

[0024] The high-permeability magnetic shielding layer 5 is made of iron-nickel alloy (such as Mu-Metal) or other alloys, which can effectively shield magnetic fields. The main role of this layer is to shield external magnetic interference and reduce the influence of the variable magnetic field generated by the transformer or other equipment during operation on the measurement of the reactor. This magnetic shielding helps to improve the accuracy and reliability of the measurement.

[0025] The internal insulation layer 6 is made of similar materials as the middle insulation layer 4, usually using polymer insulation materials or ceramic materials. This layer is used to protect the internal coils and other electrical components from short circuits or electrical leakage, and to ensure the electrical safety of the entire shielding structure; at the same time, it can also reduce the generation and propagation of electrical noise, further improving the stability of the measurement results.

[0026] Through the high-conductivity metal layer 3, the middle insulation layer 4, the high-permeability magnetic shielding layer 5, and the internal insulation layer 6, these four layers of structure can effectively reduce the interference of induced electricity and magnetic fields during field operation, ensuring the safety and accuracy of the reactor measurement DC resistance in a high-voltage environment.

[0027] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent substitutions or changes to the technical solution and the inventive concept of the present application within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A shield device for measuring direct current resistance of a reactor, characterized by: The shielding device for measuring DC resistance of the electric reactor is a cylindrical cover structure, which comprises multiple layers of structure layers, is sealed at the top and is open at the bottom; the shielding device for measuring DC resistance of the electric reactor can cover the electric reactor and the device for measuring DC resistance of the electric reactor through the bottom opening, so that the electric reactor is in a sealed state during the measurement of DC resistance.

2. The reactor measuring DC resistance shielding device according to claim 1, characterized in that: The structure layers of the cylindrical cover structure comprise a high-conductivity metal layer, a middle insulating layer, a high-magnetic-permeability magnetic shielding layer and an internal insulating layer; the high-conductivity metal layer, the middle insulating layer, the high-magnetic-permeability magnetic shielding layer and the internal insulating layer are arranged layer by layer from the outside to the inside of the cylindrical cover structure.

3. The shield device for measuring direct current resistance of a reactor according to claim 2, characterized by: The high-conductivity metal layer, the middle insulating layer, the high-magnetic-permeability magnetic shielding layer and the internal insulating layer are all cylindrical covers that are sealed at the top and open at the bottom.

4. The shield device for measuring direct current resistance of a reactor according to Claim 1, characterized by: An external edge of the bottom opening of the cylindrical cover structure is provided with a plurality of connecting lugs, which are arranged in a circumferential manner around the cylindrical cover structure.

5. The shield device for measuring direct current resistance of a reactor according to claim 4, characterized by: The connecting lug is a rectangular plate body, one side of which is fixedly connected or integrally formed with the cylindrical cover structure, and a via hole through which a bolt is fitted is arranged on the connecting lug; the cylindrical cover structure can be bolted to the bottom plate of the electric reactor through the connecting lug.

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