CN212461296U

CN212461296U - Flame-retardant heat-conducting dry-type transformer

Info

Publication number: CN212461296U
Application number: CN201922428341.XU
Authority: CN
Inventors: 宋国华; 崔荣华; 刘立军; 袁宏均
Original assignee: Jiangsu Huandong Electric Co ltd
Current assignee: Jiangsu Huandong Electric Co ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2021-02-02
Anticipated expiration: 2029-12-30

Abstract

The utility model discloses a flame-retardant heat-conducting dry-type transformer, which comprises a first die and a second die, wherein the first die and the second die are both in U-shaped structures, an end plate is arranged at the upper end part of the first die, a cavity is enclosed between the first die and the end plate, a coil is arranged in the cavity, and a heat-conducting epoxy resin layer is filled in the cavity to manufacture an inner core of the heat-conducting transformer; then, in a second mold, an inner core of the heat-conducting transformer is placed and filled with a flame-retardant epoxy resin layer. The utility model discloses structural design is novel, and structural stability is good, and this dry-type transformer both heat conduction is good can reliably fire-retardant, long service life again.

Description

Flame-retardant heat-conducting dry-type transformer

Technical Field

The utility model relates to a dry-type transformer technical field specifically is a fire-retardant heat conduction dry-type transformer.

Background

A Transformer (Transformer) is a device that changes an alternating-current voltage by using the principle of electromagnetic induction, and main components are a primary coil, a secondary coil, and an iron core (magnetic core). The main functions are as follows: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer), and the like. According to the application, the method can be divided into: power transformers and special transformers (furnace transformers, rectification transformers, power frequency test transformers, voltage regulators, mining transformers, audio transformers, intermediate frequency transformers, high frequency transformers, impact transformers, instrument transformers, electronic transformers, reactors, mutual inductors, etc.).

Dry transformers have found widespread use in electrical power systems. Because it has simple structure, maintains characteristics such as convenient, long-lived, high reliability, high fire-retardant, makes the work load of maintaining and overhauing in the operation reduce greatly, but the mountable is in the load center again simultaneously, receives more and more attention and promotes.

The epoxy resin dry-type transformer is clean and environment-friendly electric equipment, mainly uses epoxy resin as an insulating material, and the epoxy resin has been verified to have a reliable solid insulating material for more than 40 years. The dry type transformer poured by epoxy resin is valued and popularized due to the characteristics of no maintenance, high reliability, no pollution, recyclable use after the service life is over, and the like, and is widely applied to the fields of industrial and mining enterprises, power stations, airports, subways, ocean drilling platforms, and the like.

Epoxy resin dry-type transformers are generally installed and used indoors, and because of the danger of fire, the hidden danger of fire is increased. On the one hand, dry-type transformer surfaces, such as those in contact with external fire sources, may be ignited. On the other hand, the dry-type transformer in live operation is a latent fire itself and may ignite. Common causes of ignition are: the abnormal temperature rise of the dry type transformer causes local or overall overheating, external or internal short circuit, and electric sparks and arcs generated by insulation breakdown. In order to prevent the accident, when designing the dry type transformer and selecting the insulating material thereof, it should be considered to reduce the risk of fire of the dry type transformer.

With the rapid development of economic construction in China, the urban and rural electric load is continuously increased. The safe operation and service life of a dry-type transformer depends to a large extent on the safety and reliability of the insulation of the transformer windings. The resin insulation dry type transformer adopts epoxy resin as an insulation medium, and compared with an oil immersed transformer, the insulation performance and the heat resistance of the resin insulation dry type transformer are greatly improved, but the heat conduction performance of the resin insulation dry type transformer is influenced. The damage of the insulation material due to the temperature of the winding exceeding the thermal endurance limit of the insulation material is one of the main causes of the failure of the transformer, and thus the heat dissipation of the transformer is very important. The existing dry-type transformer has single structure function, poor flame retardant property and short service life, so the improvement is necessary.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fire-retardant heat conduction dry-type transformer to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a fire-retardant heat conduction dry-type transformer, includes first mould and second mould, first mould and second mould all adopt the U-shaped structure, first mould is installed in the second mould, the end plate is installed to first mould upper end, enclose into the cavity between first mould and the end plate, install the coil in the cavity, just pack the heat conduction epoxy layer in the cavity.

Preferably, a flame-retardant epoxy resin layer end plate is arranged between the outer wall of the first die and the inner wall of the second die, and the thickness of the flame-retardant epoxy resin layer end plate is 10-14 mm.

Preferably, the outer wall of the second mold is also sprayed with a flame-retardant coating.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model has novel structural design and good structural stability, and the dry-type transformer has good heat conduction, reliable flame retardance and long service life; wherein, the utility model discloses a first mould and second mould can improve the holistic stability of transformer, have improved shock resistance.

Drawings

FIG. 1 is a schematic view of the structure of the heat-conducting core of the present invention;

fig. 2 is a schematic view of the overall structure of the present invention.

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. 1-2, the present invention provides a technical solution: a flame-retardant heat-conducting dry-type transformer comprises a first die 3 and a second die 6, wherein the first die 3 and the second die 6 are both of U-shaped structures, the first die 3 is installed in the second die 6, an end plate 4 is installed at the upper end of the first die 3, a cavity is defined by the first die 3 and the end plate 4, a coil 1 is installed in the cavity, and a heat-conducting epoxy resin layer 2 is filled in the cavity; the outer wall of the second die 6 is also sprayed with a flame-retardant coating.

The utility model discloses in, install fire-retardant epoxy layer end plate 5 between 3 outer walls of first mould and the 6 inner walls of second mould, fire-retardant epoxy layer end plate 5 thickness is 10mm-14 mm.

Furthermore, the utility model discloses in, heat conduction epoxy layer 2 comprises 40% liquid epoxy, 20% curing agent, 10% toughening agent, 10% promoter, 10% defoaming agent, 10% alumina powder. The adopted heat-conducting epoxy resin layer has good high-temperature resistance, good toughness and high flame retardance, and further improves the flame retardance and heat-conducting property of the transformer.

In summary, the utility model has novel structural design and good structural stability, and the dry-type transformer has good heat conduction, reliable flame retardance and long service life; wherein, the utility model discloses a first mould and second mould can improve the holistic stability of transformer, have improved shock resistance.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A flame-retardant heat-conductive dry-type transformer comprises a first mold (3) and a second mold (6), and is characterized in that: first mould (3) and second mould (6) all adopt the U-shaped structure, install in second mould (6) first mould (3), end plate (4) are installed to first mould (3) upper end, enclose into the cavity between first mould (3) and end plate (4), install coil (1) in the cavity, just pack heat conduction epoxy layer (2) in the cavity.

2. A flame retardant, thermally conductive dry transformer as claimed in claim 1 wherein: and a flame-retardant epoxy resin layer end plate (5) is arranged between the outer wall of the first mold (3) and the inner wall of the second mold (6), and the thickness of the flame-retardant epoxy resin layer end plate (5) is 10-14 mm.

3. A flame retardant, thermally conductive dry transformer as claimed in claim 1 wherein: and a flame-retardant coating is also sprayed on the outer wall of the second die (6).