CN210015777U - Totally-enclosed strut type voltage transformer - Google Patents

Abstract

The utility model discloses a totally-enclosed pillar type voltage transformer, which comprises a bottom plate and a shell, wherein the shell is arranged on the upper surface of the bottom plate, a primary terminal is arranged at the top of the shell and is connected with a primary winding inside the shell, a secondary terminal is arranged at the position, close to the bottom, of the left side of the shell and is connected with a secondary winding inside the shell, and the primary winding and the secondary winding are both arranged on an iron core; the shell is a totally-enclosed shell which is made of epoxy resin as a raw material by utilizing an automatic pressure gel forming technology. The utility model has small volume, can be installed in any direction, and has high metering precision; the secondary wire outlet end is protected by a cover, so that electric shock accidents and electricity stealing phenomena can be avoided; the latest process of pressure injection by adopting an automatic pressure gel forming technology is formed by one-time pressure injection, and semi-conductive paper is adopted inside to carry out high-voltage shielding and low-voltage net grounding shielding, so that the stable partial discharge performance of the product is ensured.

Description

A fully enclosed pillar type voltage transformer

technical field

The utility model relates to the technical field of transformer equipment, in particular to a fully enclosed pillar type voltage transformer.

Background technique

The basic structure of the voltage transformer is very similar to that of the transformer. It also has two windings, one is called the primary winding and the other is called the secondary winding. Both windings are mounted or wound around the core. There is insulation between the two windings and between the windings and the core, so that there is electrical isolation between the two windings and between the windings and the core. When the voltage transformer is running, the primary winding N1 is connected to the line in parallel, and the secondary winding N2 is connected to the instrument or relay in parallel. Therefore, when measuring the voltage on the high-voltage line, although the primary voltage is high, the secondary is low-voltage, which can ensure the safety of operators and instruments.

With the market demand and the formulation of corresponding standards, the requirements for the overall cabinet are quite high, especially for the partial discharge test of the entire cabinet and post-installation maintenance; however, the partial discharge value of the cabinet and the product performance of the transformer must be guaranteed. It is very important, and the later maintenance is more troublesome; the partial amplification of the existing products cannot guarantee the partial discharge performance of the entire cabinet; the distance between the existing cabinets is small, and when the running time is long, the accumulation of dust will cause discharge, and, The service life of the product is low.

Utility model content

The purpose of the present invention is to provide a fully enclosed post-type voltage transformer to solve the problems raised in the above background technology.

To achieve the above object, the utility model provides the following technical solutions:

A fully enclosed pillar-type voltage transformer, comprising a base plate and a casing, the casing is mounted on the upper surface of the base plate, a primary terminal is arranged on the top of the casing, the primary terminal is connected with a primary winding inside the casing, and the left side of the casing is close to There is a secondary terminal at the bottom position, the secondary terminal is connected with the secondary winding inside the casing, the primary winding and the secondary winding are installed on the iron core; the casing is formed by using epoxy resin as raw material and using automatic pressure gel molding Fully enclosed housing made of technology.

As a further solution of the present invention, two single mutual inductors are arranged inside the casing, and the two one-way mutual inductors are connected by V/V type wiring.

As a further solution of the present invention: the epoxy resin is Huntsman resin.

As a further solution of the present invention, a protective cover is provided outside the secondary terminal.

As a further solution of the present invention, the interior of the casing adopts semi-conductive crepe paper for high-voltage and low-voltage shielding.

As a further scheme of the present utility model: the bottom plate is 33 cm long and 15 cm wide.

As a further solution of the present invention, it also includes connecting bolts, and the bottom plate is installed inside the electrical cabinet through the connecting bolts.

Compared with the prior art, the beneficial effects of the present utility model are:

1. The utility model adopts automatic pressure gel forming technology, which can achieve no solvent pollution and good internal dryness; during the curing process of the epoxy system, the pressure of the mixture is maintained, so that the mixture can be filled with epoxy resin in time during the gelation process. The voids formed by shrinkage in the epoxy resin reduce the curing shrinkage of the epoxy resin cured product from 1 to 3% in the vacuum casting process to 0.25% to 0.15%, which greatly improves the internal structure of the cured product. The internal stress is improved, and the insulation performance and mechanical strength are improved; because the liquid resin continuously fills the gap under constant pressure, the air layer between the part and the mold is indirectly reduced, the thermal conductivity is improved, the heat is uniform, the structure is dense and uniform, and there is no cracking and deformation. , and a smooth surface can be obtained; the production cycle is short, the efficiency is high, the labor intensity is low, relatively environmentally friendly, and the waste is less;

2. The utility model adopts the V/V wiring mode, and the distance between the phases is small, which increases the primary creepage distance and ensures the stable operation of the voltage between the phases;

3. The utility model is small in size, can be installed in any direction, and has high measurement accuracy; the secondary outlet end is protected by a cover, which can avoid electric shock accidents and electric theft; the latest technology of automatic pressure gel forming technology is used for injection molding, and the injection molding is performed at one time. , and the internal use of semi-conductive paper for high-voltage shielding and low-voltage network grounding shielding ensures the stable partial discharge performance of the product.

Description of drawings

FIG. 1 is a schematic front view of a fully enclosed pillar-type voltage transformer.

FIG. 2 is a left-view structural schematic diagram of a fully enclosed pillar-type voltage transformer.

FIG. 3 is a schematic top view of a fully enclosed pillar-type voltage transformer.

In the picture: 1- primary terminal, 2- shell, 3- bottom plate, 4- connecting bolt, 5- secondary terminal.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Referring to FIGS. 1 to 3 , in an embodiment of the present invention, a fully enclosed pillar-type voltage transformer includes a bottom plate 3 and a casing 2 , the casing 2 is installed on the upper surface of the bottom plate 3 , and a top of the casing 2 is provided There is a primary terminal 1. The primary terminal 1 is connected to the primary winding inside the casing 2. The left side of the casing 2 is provided with a secondary terminal 5 near the bottom. The secondary terminal 5 is connected to the secondary winding inside the casing 2. The primary winding, The secondary windings are all installed on the iron core; the casing 2 is a fully enclosed casing made of epoxy resin as a raw material by automatic pressure gel forming technology.

The inside of the casing 2 is provided with two single mutual inductors, and the two one-way mutual inductors are connected by V/V type wiring.

The epoxy resin is Huntsman resin.

A protective cover is provided outside the secondary terminal 5 .

The interior of the casing 2 is shielded from high voltage and low voltage by semi-conductive crepe paper.

The bottom plate 3 is 33 cm long and 15 cm wide.

It also includes connecting bolts 4 , and the bottom plate 3 is installed inside the electrical cabinet through the connecting bolts 4 .

The utility model adopts the V/V wiring mode, and the distance between the phases is small, the primary creepage distance is increased, and the stable operation of the voltage between the phases is ensured.

The utility model adopts the automatic pressure gel forming technology, which can achieve no solvent pollution and good internal dryness; during the curing process of the epoxy system, the pressure of the mixture is maintained, so that the mixture can be filled with epoxy resin in time. The voids formed by shrinkage reduce the curing shrinkage of the epoxy resin cured product from 1 to 3% in the vacuum casting process to 0.25% to 0.15%, which greatly improves the compactness of the internal structure of the cured product and reduces the internal structure. stress, improve the insulation performance and mechanical strength; because the liquid resin continuously fills the gap under constant pressure, thereby indirectly reducing the air layer between the part and the mold, improving the thermal conductivity, uniform heating, improving the density and uniformity of the structure, no cracking and deformation, and Smooth surface can be obtained; short production cycle, high efficiency, low labor intensity, relatively environmental protection and less waste.

This product adopts high-performance iron core to ensure product parameters and stable operation. The resin is cast and formed by APG special resin (American Huntsman resin), with beautiful appearance. PD stability.

This type of voltage transformer is the latest APG epoxy resin pressure-injected fully enclosed structure. It consists of two single transformers using V/V type wiring to form a three-phase voltage transformer. It is suitable for rated voltage of 10kV and rated frequency of 50Hz or The 60Hz power line and its equipment are used for voltage and electric energy measurement; the secondary output of the normal product is 100V, and it has a 220V control power supply as needed; the product is compact and easy to install, and can be widely used in various American box transformers and other Switchgear.

The utility model is small in size, can be installed in any direction, and has high measurement accuracy; the secondary outlet end is protected by a cover, which can avoid electric shock accidents and electric theft; The internal use of semi-conductive paper for high-voltage shielding and low-voltage network grounding shielding ensures the stable partial discharge performance of the product.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention may be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments are to be considered in all respects as exemplary and not restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is therefore intended that the All changes within the meaning and range of the required equivalents are embraced within the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

In addition, it should be understood that although this specification is described in terms of embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (7)

1. The totally-enclosed strut type voltage transformer is characterized by comprising a bottom plate (3) and a shell (2), wherein the shell (2) is installed on the upper surface of the bottom plate (3), a primary terminal (1) is arranged at the top of the shell (2), the primary terminal (1) is connected with a primary winding inside the shell (2), a secondary terminal (5) is arranged on the left side of the shell (2) close to the bottom, the secondary terminal (5) is connected with a secondary winding inside the shell (2), and the primary winding and the secondary winding are both installed on an iron core; the shell (2) is a totally-enclosed shell which is made of epoxy resin as a raw material by utilizing an automatic pressure gel forming technology.

2. A totally enclosed pillar type voltage transformer according to claim 1, characterized in that two single-phase transformers are arranged inside the housing (2), and the two single-phase transformers are connected by a V/V connection.

3. The totally enclosed pillar type voltage transformer according to claim 1, wherein said epoxy resin is a hensman resin.

4. A totally enclosed column voltage transformer according to claim 1, characterized in that said secondary terminal (5) is externally provided with a protective cover.

5. A totally enclosed pillar type voltage transformer according to claim 1, characterized in that the inside of said housing (2) is shielded from high and low voltages by semi-conductive crepe paper.

6. A totally enclosed column voltage transformer according to claim 1, characterized in that said bottom plate (3) is 33 cm long and 15 cm wide.

7. The totally-enclosed pillar type voltage transformer according to claim 1, further comprising a connecting bolt (4), wherein the bottom plate (3) is installed inside the electrical cabinet through the connecting bolt (4).

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