A metal shell fully shielded plug-in voltage transformer

Abstract

The utility model discloses a metal shell fully shielded plug-in voltage transformer, which belongs to the technical field of voltage transformers. The utility model includes a metal shell and a transformer body installed inside the metal shell; the transformer body is formed by integral injection molding of a conductive rod, a primary winding, an insulating cylinder, an iron core and a secondary winding stably installed inside the metal shell; the conductive rod is electrically connected to the primary winding; a mounting plate is provided at the bottom of the metal shell; the metal shell is electrically connected to the mounting plate and the mounting plate is grounded. The surface of the voltage transformer of the utility model is grounded, which is zero potential, can effectively avoid problems such as flickering and surface creepage on the outside of the transformer, and can effectively improve the safety of the product; by stably arranging various components inside the metal shell and forming the transformer body by epoxy resin casting, the protective effect of the transformer body is improved, the mechanical strength is high, the mechanical impact resistance and corrosion resistance are good, and the production efficiency is improved, which is convenient and practical.

Description

Technical Field

[0001] The utility model relates to the technical field of voltage transformers, in particular to a metal shell fully shielded plug-in voltage transformer. Background Art

[0002] With the development of economy and the increase of population, the global demand for electricity is increasing. Box-type gas-insulated metal-enclosed switchgear (CGIS for short) is a new type of high-voltage switchgear that uses gas insulation technology to replace traditional air-insulated switchgear. Compared with traditional switchgear, CGIS has the advantages of small size, high reliability and strong safety performance, so it has been widely used in the power industry.

[0003] The voltage transformer is one of the main components in the box-type gas-insulated metal-enclosed switchgear. It has the functions of conveniently measuring and monitoring voltage, protecting various equipment in the power system, providing accurate voltage signals in the electric energy metering system, and accurately measuring the electric energy metering instrument. However, since the transformer itself is cast with epoxy resin insulation, and the insulation inside the CGIS is gas, the electric field strength on the side with a small dielectric constant is easily increased due to the difference in dielectric constants at the junction of solid insulation, electrode, and gas, and develops into surface flashover. An air gap is easily formed at the contact point between the electrode and the solid insulation, resulting in an increase in local electric field strength, thereby reducing the service life of the product. At the same time, the existing voltage transformers are all formed by spraying metal on the surface of the injection-molded transformer body to form a shell. Under the condition of ensuring quality requirements, the process requirements are high, relatively complex, and the efficiency is low; and it is easy to be damaged by bumps. For this reason, the utility model provides a metal shell fully shielded plug-in voltage transformer. Utility Model Content

[0004] In view of the above-mentioned technical deficiencies, the purpose of the utility model is to provide a metal shell fully shielded plug-in voltage transformer, by stably arranging various components inside the metal shell and using epoxy resin casting to form the transformer body; it not only improves the protection effect of the transformer body, but also improves the production efficiency; the surface of the voltage transformer is grounded and has zero potential, which can effectively avoid flickering and surface creepage on the outside of the transformer; it solves the technical problems raised in the background technology.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: the utility model provides a metal shell fully shielded plug-in voltage transformer, including: a metal shell and a transformer body installed inside the metal shell; the transformer body includes a conductive rod, a primary winding, an insulating cylinder, an iron core and a secondary winding arranged from top to bottom; the conductive rod is electrically connected to the primary winding; the transformer body is formed by integral injection molding of the conductive rod, the primary winding, the insulating cylinder, the iron core and the secondary winding stably installed in the metal shell; a mounting plate is provided at the bottom end of the metal shell; the metal shell is electrically connected to the mounting plate and the mounting plate is grounded.

[0006] Preferably, an outer cone sleeve is disposed outside the conductive rod; and the outer cone sleeve is electrically connected to a cable plug.

[0007] Preferably, a flange is provided at the front end of the metal shell, located outside the outer cone sleeve; and the cable plug is fixedly mounted on the metal shell by cooperating with the flange.

[0008] Preferably, the transformer body is cast with epoxy resin to form an integrated structure.

[0009] Preferably, an anti-oxidation layer is sprayed on the outer surface of the metal shell.

[0010] The beneficial effects of the utility model are:

[0011] 1. The surface of the voltage transformer of the utility model is grounded, which is zero potential, and can effectively avoid the problems of flickering and surface creepage on the outside of the transformer, and can effectively improve the safety of the product. Since a metal shell is used, it has high mechanical strength, mechanical impact resistance, and good corrosion resistance, and will not oxidize or absorb moisture due to the passage of time, which can make the voltage transformer run stably and reliably and extend its service life; since a metal shell is used, it has good thermal conductivity, can effectively dissipate heat, and improve the working efficiency of the voltage transformer; since the surface of the metal shell is smooth, it is easy to maintain. Since a metal shell is used as a mold, there is no need to bake the mold and assemble and disassemble the mold, which not only greatly improves production efficiency and capacity, but also has lower costs, and is easier and simpler to operate.

[0012] 2. The utility model stably arranges various components inside the metal shell and forms the transformer body by epoxy resin casting, which not only improves the protection effect of the transformer body, but also improves the production efficiency, which is convenient and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 The utility model is a structural schematic diagram of a metal shell fully shielded plug-in voltage transformer.

[0015] Figure 2 The utility model is a schematic diagram of the internal structure of a metal shell fully shielded plug-in voltage transformer.

[0016] Explanation of the reference numerals: 1-metal casing, 10-mounting plate, 2-transformer body, 21-conductive rod, 22-primary winding, 23-insulating cylinder, 24-iron core, 25-secondary winding, 3-outer cone bushing, 4-flange. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Specific embodiment one:

[0019] like Figure 1 to Figure 2As shown, this embodiment provides a metal shell fully shielded plug-in voltage transformer, including: a metal shell 1 and a transformer body 2 installed inside the metal shell 1; the transformer body 2 includes a conductive rod 21, a primary winding 22, an insulating tube 23, an iron core 24 and a secondary winding 25 arranged from top to bottom; the conductive rod 21 is electrically connected to the primary winding 22; an outer cone sleeve 3 is arranged outside the conductive rod 21; the outer cone sleeve 3 is electrically connected to the cable plug; in addition, a flange 4 is provided at the front end of the metal shell 1 on the outside of the outer cone sleeve 3; the cable plug is fixedly installed on the metal shell 1 by cooperating with the flange 4, which is convenient for installation and connection. The transformer body 2 is formed by integral injection molding of a conductive rod 21, a primary winding 22, an insulating cylinder 23, an iron core 24 and a secondary winding 25 which are stably installed in a metal shell 1; specifically, the transformer body 2 is an integrated structure cast by epoxy resin; in fact, the conductive rod 21, the primary winding 22, the insulating cylinder 23, the iron core 24 and the secondary winding 25 are all installed on a receiving fixture for stably fixing the above-mentioned components inside the metal shell 1, so as to form a complete transformer body 2 by injection molding the above-mentioned components; by stably arranging various components inside the metal shell 1 and forming the transformer body 2 by epoxy resin casting, the protection effect of the transformer body 2 is improved, and the production efficiency is improved, which is convenient and practical.

[0020] See also Figure 1 As shown, a mounting plate 10 is provided at the bottom of the metal shell 1; the metal shell 1 is electrically connected to the mounting plate 10 and the mounting plate 10 is grounded, and the shell protection grade reaches IK07. The outer surface of the metal shell 1 is sprayed with an anti-oxidation layer to improve the anti-oxidation effect; in addition, the outer surface of the metal shell 1 can be sprayed with a strengthening layer to improve the hardness and other protective layers as needed.

[0021] The surface of the voltage transformer of the utility model is grounded and has zero potential, which can effectively avoid the problems of flickering and surface creepage on the outside of the transformer, and can effectively improve the safety of the product. Since a metal shell is used, it has high mechanical strength, mechanical impact resistance, and good corrosion resistance, and will not oxidize or absorb moisture due to the passage of time, which can make the voltage transformer run stably and reliably and extend its service life; since a metal shell is used, it has good thermal conductivity, can effectively dissipate heat, and improve the working efficiency of the voltage transformer; since the surface of the metal shell is smooth, it is easy to maintain. Since a metal shell is used as a mold, there is no need to bake the mold and assemble and disassemble the mold, which not only greatly improves production efficiency and capacity, but also has lower costs, and is easier and simpler to operate.

[0022] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A metal shell fully shielded plug-in voltage transformer, characterized in that: include: A metal shell (1) and a transformer body (2) installed inside the metal shell (1); the transformer body (2) comprises a conductive rod (21), a primary winding (22), an insulating cylinder (23), an iron core (24) and a secondary winding (25) arranged from top to bottom; the conductive rod (21) is electrically connected to the primary winding (22); the transformer body (2) is formed by integral injection molding of the conductive rod (21), the primary winding (22), the insulating cylinder (23), the iron core (24) and the secondary winding (25) stably installed inside the metal shell (1); a mounting plate (10) is provided at the bottom end of the metal shell (1); the metal shell (1) is electrically connected to the mounting plate (10) and the mounting plate (10) is grounded.

2. A metal shell fully shielded plug-in voltage transformer as claimed in claim 1, characterized in that: An outer cone sleeve (3) is disposed outside the conductive rod (21); the outer cone sleeve (3) is electrically connected to a cable plug.

3. A metal shell fully shielded plug-in voltage transformer as claimed in claim 2, characterized in that: The front end of the metal shell (1) is located outside the outer cone sleeve (3) and is provided with a flange (4); the cable plug is fixedly mounted on the metal shell (1) by cooperating with the flange (4).

4. A metal shell fully shielded plug-in voltage transformer as claimed in claim 1, characterized in that: The mutual inductor body (2) is cast with epoxy resin to form an integrated structure.

5. The metal shell fully shielded plug-in voltage transformer according to claim 1, characterized in that: The outer surface of the metal shell (1) is spray-coated with an anti-oxidation layer.

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