CN210015777U

CN210015777U - Totally-enclosed strut type voltage transformer

Info

Publication number: CN210015777U
Application number: CN201820067581.4U
Authority: CN
Inventors: 何勇
Original assignee: Guangdong Oscon Electric Co Ltd
Current assignee: Guangdong Oscon Electric Co Ltd
Priority date: 2018-01-16
Filing date: 2018-01-16
Publication date: 2020-02-04
Anticipated expiration: 2028-01-16

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

Totally-enclosed strut type voltage transformer

Technical Field

The utility model relates to a mutual-inductor equipment technical field specifically is a totally closed pillar type voltage transformer.

Background

The basic structure of a voltage transformer is similar to that of a transformer, and the voltage transformer also has two windings, one is called a primary winding and the other is called a secondary winding. Both windings are mounted or wound on a core. Insulation is arranged between the two windings and between the windings and the iron core, so that the two windings and between the windings and the iron core are electrically isolated. When the voltage transformer operates, the primary winding N1 is connected in parallel on a circuit, and the secondary winding N2 is connected in parallel with an instrument or a relay. Therefore, when measuring the voltage on the high-voltage line, although the primary voltage is high, the secondary voltage is low, and the safety of operators and instruments can be ensured.

Along with the establishment of market demands and corresponding standards, the requirements on the whole cabinet body are quite high, and particularly the partial discharge test on the whole cabinet body and the later maintenance after installation are carried out; however, to ensure the partial discharge value of the cabinet body, the product performance of the mutual inductor is very important, and the later maintenance is troublesome; the partial discharge performance of the whole cabinet body cannot be guaranteed due to the partial discharge of the existing product; the distance in the existing cabinet body is small, the operation time is long, the dust is accumulated to cause discharge, and the service life of the product is short.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a totally closed pillar type voltage transformer to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a totally-enclosed pillar type voltage transformer comprises a bottom plate and a shell, wherein the shell is installed on the upper surface of the bottom plate, a primary terminal is arranged at the top of the shell and connected with a primary winding in the shell, a secondary terminal is arranged at the position, close to the bottom, of the left side of the shell and connected with a secondary winding in the shell, and the primary winding and the secondary winding are both installed 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.

As a further aspect of the present invention: two single-phase transformers are arranged inside the shell and connected in a V/V type wiring mode.

As a further aspect of the present invention: the epoxy resin is a Henschel resin.

As a further aspect of the present invention: and a protective cover is arranged outside the secondary terminal.

As a further aspect of the present invention: the inside of the shell adopts semi-conductive crepe paper to carry out high-voltage and low-voltage shielding.

As a further aspect of the present invention: the bottom plate is 33 cm long and 15 cm wide.

As a further aspect of the present invention: the electric cabinet further comprises a connecting bolt, and the bottom plate is mounted inside the electric cabinet through the connecting bolt.

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

the utility model adopts the automatic pressure gel forming technology, which can realize no solvent pollution and good internal dryness; in the curing process of the epoxy system, the pressure of the mixture is kept, so that the mixture can fill a gap formed by the shrinkage of the epoxy resin in the gelling process in time, and the curing shrinkage of the cured epoxy resin is reduced to 0.25-0.15% from 1-3% of the vacuum casting process, thereby greatly improving the compactness of the internal structure of the cured epoxy resin, reducing the internal stress and improving the insulating property and the mechanical strength; the liquid resin continuously fills the gap under constant pressure, so that an air layer between the workpiece and the die is indirectly reduced, the heat conduction performance is improved, the uniform heating is realized, the structural compactness and uniformity are improved, the cracking deformation is avoided, and the smooth surface can be obtained; the production period is short, the efficiency is high, the labor intensity is low, the environment is relatively protected, and the waste material is less;

the utility model adopts a V/V wiring mode, and the distance between phases is small, thereby increasing the first creepage distance and ensuring the voltage stable operation between phases;

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.

Drawings

Fig. 1 is a schematic diagram of a front view structure of a totally-enclosed pillar type voltage transformer.

Fig. 2 is a left-side view structural schematic diagram of the totally-enclosed pillar type voltage transformer.

Fig. 3 is a schematic diagram of a top view structure of the totally-enclosed pillar type voltage transformer.

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

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 3, in an embodiment of the present invention, a totally-enclosed pillar type voltage transformer includes a bottom plate 3 and a housing 2, where the housing 2 is installed on an upper surface of the bottom plate 3, a primary terminal 1 is disposed at a top of the housing 2, the primary terminal 1 is connected to a primary winding inside the housing 2, a secondary terminal 5 is disposed at a position near a bottom of the left side of the housing 2, the secondary terminal 5 is connected to a secondary winding inside the housing 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.

Two single-phase transformers are arranged inside the shell 2 and connected in a V/V type wiring mode.

The epoxy resin is a Henschel resin.

And a protective cover is arranged outside the secondary terminal 5.

The inside of the shell 2 adopts semi-conductive crepe paper to carry out high-voltage and low-voltage shielding.

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

The electric cabinet further comprises a connecting bolt 4, and the bottom plate 3 is installed inside the electric cabinet through the connecting bolt 4.

The utility model discloses a V/V mode of connection, and the phase is less with the distance between the phase, has increased creep distance, has guaranteed the voltage steady operation between the phase and the phase.

The utility model adopts the automatic pressure gel forming technology, which can realize no solvent pollution and good internal dryness; in the curing process of the epoxy system, the pressure of the mixture is kept, so that the mixture can fill a gap formed by the shrinkage of the epoxy resin in the gelling process in time, and the curing shrinkage of the cured epoxy resin is reduced to 0.25-0.15% from 1-3% of the vacuum casting process, thereby greatly improving the compactness of the internal structure of the cured epoxy resin, reducing the internal stress and improving the insulating property and the mechanical strength; the liquid resin continuously fills the gap under constant pressure, so that an air layer between the workpiece and the die is indirectly reduced, the heat conduction performance is improved, the uniform heating is realized, the structural compactness and uniformity are improved, the cracking deformation is avoided, and the smooth surface can be obtained; short production period, high efficiency, low labor intensity, relative environmental protection and less waste.

The product adopts the high-performance iron core to ensure the product parameters and stable operation, the resin is molded by one-step casting by adopting APG special resin (American Hensman resin), the appearance is attractive, and the inside of the product is completely shielded by adopting semi-conductive crepe paper for high voltage and low voltage, so that the partial discharge stability of the product is ensured.

The voltage transformer is a latest APG epoxy resin pressure injection fully-closed structure, and is a three-phase voltage transformer formed by two single-phase transformers by adopting V/V type connection, and is suitable for voltage and electric energy measurement in a power line with the rated voltage of 10kV and the rated frequency of 50Hz or 60Hz and equipment thereof; the secondary output of a normal product is 100V, and a 220V control power supply is arranged as required; the product has flexible volume and convenient installation, and can be widely used for various American box transformers and other switch cabinets.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

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).