Plastic shell type totally-enclosed low-voltage voltage transformer

Abstract

The utility model discloses a plastic shell type totally-enclosed low-voltage voltage transformer, which adopts a totally-enclosed structure and comprises a plastic shell and a voltage transformer body, the voltage transformer body is arranged in the plastic shell, epoxy resin is used for pouring the voltage transformer body in the plastic shell, an iron core is in a circular ring shape, the cross section of the iron core is in a square shape, and the plastic shell is arranged in the plastic shell. The secondary winding and the primary winding are evenly wound on the iron core, one side of the plastic shell is closed, the other side of the plastic shell is open, a ()-shaped protrusion which is 8-10 mm along an inner cavity of the plastic shell is arranged at the position, 3-5 mm away from the closed side, inside the plastic shell, the voltage transformer body is arranged on the protrusion inside the plastic shell, and the primary winding and the secondary winding are fixed to reserved mounting holes of the plastic shell through embedded nuts. The epoxy resin is filled in the plastic shell and is flush with the open side of the plastic shell. The requirements of special use environments of wind power projects are met, the research, development and manufacturing cost of the product is saved, and the product is compact in structure and simple in appearance; installation is convenient and maintenance is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of voltage transformers, in particular to a molded case fully enclosed low-voltage voltage transformer, which saves product research and development and manufacturing costs and has a compact product structure. Background Art

[0002] Voltage transformers are used in power systems to power measuring instruments and relay protection devices to measure the voltage, power and electric energy of the line, or to protect valuable equipment, motors and transformers in the line when a line fault occurs. Wind energy is a clean and pollution-free renewable energy source. my country is rich in wind energy resources. At present, the country is vigorously developing clean energy. Wind energy is one of the many projects in recent years. Low-voltage voltage transformers are indispensable for monitoring and protection. At present, low-voltage voltage transformers mostly use semi-enclosed structures due to their low insulation level, while fully enclosed products mostly use the design of conventional voltage transformers and are molded by casting. Their R&D and manufacturing costs are high and their sizes are relatively large. The semi-enclosed structure is not convenient for maintenance due to the special use environment of wind power projects, and the replacement cycle is short. Summary of the invention

[0003] The utility model is an improvement made to at least one defect of the prior art. It provides a molded case fully enclosed low-voltage voltage transformer that meets the needs of the special use environment of wind power projects, saves product research and development and manufacturing costs, and has a compact product structure and a simple appearance; it is easy to install and maintain.

[0004] The technical solution adopted by the utility model is a molded case fully enclosed low-voltage voltage transformer. The low-voltage voltage transformer adopts a fully enclosed structure, including a molded case and a voltage transformer body. The voltage transformer body is placed in the molded case, and the voltage transformer body is cast in the molded case with epoxy resin. The iron core is annular and has a square cross-section. The secondary winding and the primary winding are evenly wound on the iron core. One side of the molded case is closed and the other side is open. There is an 8-10mm "()"-shaped protrusion along the inner cavity of the molded case at 3-5mm near the closed side. The voltage transformer body is placed on the protrusion inside the molded case. The primary and secondary windings and the grounding are fixed to the mounting holes reserved in the molded case with embedded nuts. The epoxy resin fills the inside of the molded case and is flush with the open side of the molded case.

[0005] Furthermore, the iron core is evenly wound with a silicone tape and an insulating tape.

[0006] Furthermore, the secondary winding and the primary winding are evenly wound on the core using polyester enameled wire, and polyester film capacitor paper is used for insulation between layers and between windings.

[0007] Furthermore, the plastic shell is made of modified flame-retardant ABS material and is coated with a protective film.

[0008] The beneficial effects of the utility model are as follows: the utility model adopts a plastic shell instead of a mold, and uses epoxy resin to cast the body in the plastic shell and form it as a whole with the plastic shell; it saves the R&D and manufacturing costs of the product. Since the circular ring core has small magnetic leakage and a short magnetic circuit, the parameters and performance of the product are guaranteed when the size of the body is reduced. The plastic shell adopts modified flame-retardant ABS material and does not deform under high temperature environment; flame retardant performance: UL-94, VO, and a protective film is applied externally. It ensures that the product operates reliably and is easy to maintain under specific environments. The manufactured body is placed on the protrusion inside the shell, and the primary, secondary and grounding embedded nuts are fixed to the mounting holes reserved in the shell. The inside of the shell is filled with epoxy resin and is flush with the shell on the open side. After curing and molding, the insulation performance and mechanical properties of the product can be well guaranteed. The product has a compact structure and a simple appearance; it is suitable for the needs of special use environments of wind power projects, and is easy to install and maintain. The utility model is suitable for the needs of special use environments of wind power projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural diagram of a low voltage voltage transformer.

[0010] Figure 2 yes Figure 1 A-direction view.

[0011] Figure 3 It is a structural diagram of the plastic shell.

[0012] Figure 4 It is the front view of the core.

[0013] Figure 5 It is the side view of the core.

[0014] Markings in the figure: 1- plastic case, 2- voltage transformer body, 3- epoxy resin, 4- embedded nut, 5- shaped protrusion, 6- iron core. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0016] like Figures 1 to 5As shown, a molded case fully enclosed low-voltage voltage transformer includes a molded case 1, a voltage transformer body 2, epoxy resin 3 and an embedded nut 4, a shaped protrusion 5, and an iron core 6. The low-voltage voltage transformer adopts a fully enclosed structure, the voltage transformer body 2 is specially designed, and its iron core 6 is designed to be annular. The secondary winding and the primary winding are evenly wound on the iron core 6. The molded case 1 replaces the mold, and the voltage transformer body 2 is cast in the molded case 1 with the epoxy resin 3 as insulation to be integrally formed with the molded case 1; the product R&D and manufacturing costs are saved, the product structure is compact, and the appearance is simple; it is suitable for the special use environment requirements of wind power projects, and is easy to install and maintain.

[0017] Specifically, the voltage transformer body 2 is specially designed, and its iron core 6 is designed to be annular in shape with a square cross section; silicone tape and insulating tape are evenly wound on the surface of the iron core to ensure buffering and insulation performance; the secondary and primary windings are evenly wound on the iron core 6 with polyester enameled wire, and polyester film capacitor paper is used for insulation between layers and windings; thus, the voltage transformer body 2 is also annular, and since the annular iron core 6 has small magnetic leakage and short magnetic circuit, the parameters and performance of the product are guaranteed when the size of the voltage transformer body 2 is reduced. The plastic shell 1 is made of modified flame-retardant ABS material, which does not deform under high temperature environment; flame retardant performance: UL-94, VO, with external protective film. Ensure that the product operates reliably and is easy to maintain under specific environments. The plastic shell 1 is closed on one side and open on the other side, the bottom is closed and the top is open. There is an 8-10mm "()" shaped protrusion 5 along the inner cavity of the shell 3-5mm away from the closed side. When the product is produced, the mold is replaced by the plastic shell 1, and the prepared voltage transformer body 2 is placed on the protrusion inside the shell. The primary, secondary and grounding embedded nuts 4 are fixed to the reserved mounting holes of the shell. The inside of the plastic shell 1 is filled with epoxy resin 3 and flush with the open side of the plastic shell 1. After curing and molding, the insulation and mechanical properties of the product can be well guaranteed. The embedded nuts 4 have two sizes, with a thread diameter of ≥5mm and no less than 4; a thread diameter of ≥8mm and no less than 2. The molded case fully enclosed low-voltage voltage transformer saves R&D and manufacturing costs. After the product is formed, the structure is compact and the appearance is simple. It is suitable for the special use environment requirements of wind power projects, and is easy to install and maintain.

[0018] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A molded case fully enclosed low voltage voltage transformer, characterized in that: The low-voltage voltage transformer adopts a fully enclosed structure, including a plastic shell and a voltage transformer body. The voltage transformer body is placed in the plastic shell, and the voltage transformer body is cast in the plastic shell with epoxy resin. The iron core is circular and has a square cross-section. The secondary winding and the primary winding are evenly wound on the iron core. One side of the plastic shell is closed and the other side is open. There is an 8-10mm "()"-shaped protrusion along the inner cavity of the plastic shell 3-5mm away from the closed side. The voltage transformer body is placed on the protrusion inside the plastic shell, and the primary and secondary windings and the grounding are fixed to the mounting holes reserved in the plastic shell with embedded nuts. The epoxy resin fills the inside of the plastic shell and is flush with the open side of the plastic shell.

2. A molded case fully enclosed low voltage voltage transformer according to claim 1, characterized in that: The iron core is evenly wound with a silicone tape and an insulating tape.

3. A molded case fully enclosed low voltage voltage transformer according to claim 1, characterized in that: The secondary winding and the primary winding are evenly wound on the iron core using polyester enameled wire, and the layers and windings are insulated using polyester film capacitor paper.

4. A molded case fully enclosed low voltage voltage transformer according to claim 1, characterized in that: The plastic shell is made of modified flame-retardant ABS material and is coated with a protective film.

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