CN111933423A - Body structure of single-phase direct-buried dry-type transformer - Google Patents

Abstract

The invention discloses a body structure of a single-phase direct-buried dry-type transformer, belonging to the technical field of transformers. The high-voltage winding and the low-voltage winding are integrally cast with epoxy resin; the outer side of the high-voltage winding is provided with a shielding layer and a high-voltage outlet pile head; the outer side of the high-voltage outlet pile head is provided with a high-voltage outlet wire shielding layer. The high-voltage winding and the low-voltage winding are integrally formed by epoxy resin vacuum casting to form a whole set on the iron core, and a resin layer is formed between the high-voltage winding and the low-voltage winding, and between the high-voltage winding and the shielding layer, and the air is replaced by the resin layer. and transformer oil, has reliable insulation, small size, and can avoid partial discharge through the shielding and protection of shielding layer and high-voltage outlet shielding layer, has good sealing, waterproof, anti-corrosion, anti-rust and heat dissipation performance, can be flexibly applied to underground Environment, good practicality.

Description

Body structure of a single-phase direct-buried dry-type transformer

technical field

The invention belongs to the technical field of transformers, in particular to a body structure of a single-phase direct-buried dry-type transformer.

Background technique

At present, in the conventional power supply, several traditional power supply schemes cannot meet the requirements of outdoor all-weather uninterrupted operation, which brings great trouble to power supply and urban management. The main application types are: traditional box-room substations and buried transformers. For the traditional box-type substation, its heat dissipation performance is not good, the floor area is large, and the appearance is not uniform, which is out of tune with the beautiful urban environment; while buried transformers are mostly oil-immersed transformers, but oil-immersed transformers have maintenance work. It is easy to be corroded, easy to rust, and has high environmental requirements, and the traditional buried oil-immersed transformer is too large, which is not conducive to the placement of the buried transformer in the green belt.

SUMMARY OF THE INVENTION

In order to solve the problem of poor heat dissipation performance of today's box-type substations, large area and inconsistent appearance, which are incompatible with the beautiful urban environment, buried transformers are mostly oil-immersed transformers, which are too bulky and require a lot of maintenance work. It has high requirements on the environment and is not conducive to the placement in the green belt. The present invention provides a body structure of a single-phase directly buried dry-type transformer.

The present invention is achieved through the following technical solutions.

A body structure of a single-phase direct-buried dry-type transformer, comprising an iron core, a low-voltage winding is respectively sleeved on an opposite side of the iron core, a high-voltage winding is arranged on the outer side of the low-voltage winding, and the high-voltage winding and the low-voltage winding are provided. The winding is integrally casted with epoxy resin; the outer side of the high-voltage winding is provided with a shielding layer and a high-voltage outlet pile head; the outer side of the high-voltage outlet pile head is provided with a high-voltage outlet wire shielding layer.

A further improvement of the present invention is that both ends of the low-voltage winding are respectively connected with an incoming copper bar and an outgoing copper bar; the incoming copper bar is arranged inside the low-voltage winding, and its cross section is rectangular; the outgoing copper bar is provided with On the outer side of the low-voltage winding, the outer side is arc-shaped.

A further improvement of the present invention is that the above-mentioned high-voltage outlet pile heads are arranged on the upper and lower parts of the outer side of the high-voltage winding, and are respectively connected to both ends of the high-voltage winding.

A further improvement of the present invention is that the above-mentioned high-voltage outlet pile head is seamlessly connected with a cable plug-in head.

A further improvement of the present invention is that both the shielding layer and the shielding layer of the high-voltage outgoing line include an inner semiconductor layer and an outer copper mesh layer.

A further improvement of the present invention is that the above-mentioned semiconductor layer is formed by winding semiconductor paper.

A further improvement of the present invention is that the above-mentioned shielding layer and the shielding layer of the high-voltage outgoing line adopt the form of one-point grounding.

It can be seen from the above technical solutions that the beneficial effects of the present invention are as follows: 1. The high-voltage winding and the low-voltage winding are integrally formed by vacuum casting epoxy resin to form a whole, and are sleeved on the iron core, and between the high-voltage winding and the low-voltage winding A resin layer is formed between the high-voltage winding and the shielding layer, and the air insulation and transformer oil insulation are replaced by the resin layer, which has reliable insulation, and its volume is greatly reduced. , can avoid partial discharge, and has good sealing and heat dissipation performance, can be flexibly used in underground installation, less affected by the environment, good practicability, and has broad development prospects. 2. The incoming copper bar and the outgoing copper bar are reasonably arranged, the connection is stable and reliable, and the outer side of the outgoing copper bar is arc-shaped, which perfectly matches the outer annular resin layer to prevent damage to the local structure of the inner surface of the resin layer. 3. The high-voltage outlet pile head forms the outlet structure of the high-voltage winding, which is simple in structure and reasonable in design. 4. The high-voltage outlet pile head is outputted through the seamless connection of the cable plug-and-pull head to ensure the tightness and safety of the connection. 5. Equipotential is formed by the copper mesh layer, which can prevent the cracking phenomenon caused by unreliable curing with the resin layer. The semiconductor layer can further uniformize the electric field and avoid partial discharge, with good safety and high reliability. 6. The semiconductor layer is formed by winding the semiconductor paper to ensure a good uniform electric field effect, the raw materials are cheap, easy to obtain, and the winding is simple and convenient. 7. There is only one ground reference point for one-point grounding, the potential height of the whole system is consistent, the structure is simple, and the safety is good.

Description of drawings

In order to illustrate the technical solutions of the present invention more clearly, the accompanying drawings required in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, which are not relevant to ordinary skills in the art. As far as personnel are concerned, other drawings can also be obtained from these drawings on the premise of no creative work.

FIG. 1 is a schematic structural diagram of a specific embodiment of the present invention.

FIG. 2 is a schematic top-view cross-sectional structural diagram of a high-voltage winding according to a specific embodiment of the present invention.

FIG. 3 is a schematic structural diagram of a high-voltage outlet pile head according to a specific embodiment of the present invention.

In the drawings: 1. Iron core, 2. High voltage winding, 201, Shielding layer, 20101, Semiconductor layer, 20102, Copper mesh layer, 202, High voltage outlet pile head, 20201, High voltage outlet shielding layer, 3. Low voltage winding, 301 , Incoming copper row, 302, outgoing copper row, 4, resin layer, 5, cable plug.

Detailed ways

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the specific embodiments. Obviously, the implementation described below Examples are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in this patent, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this patent.

As shown in the accompanying drawings, a body structure of a single-phase direct-buried dry-type transformer includes an iron core 1 with a circular cross-section of a rectangular frame structure, and low-voltage windings 3 are respectively sleeved on an opposite side of the iron core 1 , the outer side of the low-voltage winding 3 is provided with a high-voltage winding 2, the high-voltage winding 2 and the low-voltage winding 3 are integrally wound, and are formed by epoxy resin vacuum casting; after casting, between the low-voltage winding 3 and the high-voltage winding 2 , and a resin layer 4 is formed on the outside of the high-voltage winding 2, and the resin layer 4 is provided with a grid-shaped glass fiber impregnated with resin. The grid-shaped glass fiber is used as the supporting skeleton of the resin layer 4, and the resin layer 4 adopts F-grade epoxy resin to ensure better structural performance and insulation. The outer side of the high-voltage winding 2 is provided with a shielding layer 201 and a high-voltage outlet wire pile head 202 ; the outer side of the high-voltage outlet wire pile head 202 is provided with a high-voltage outlet wire shielding layer 20201 .

The high-voltage winding 2 and the low-voltage winding 3 are integrally formed by vacuum casting epoxy resin to form a whole, and are sleeved on the iron core 1, between the high-voltage winding 2 and the low-voltage winding 3, and between the high-voltage winding 2 and the shielding layer 201. The resin layer 4 is formed separately, and the air insulation and transformer oil insulation are replaced by the resin layer 4, which has reliable insulation, and its volume is greatly reduced, and the shielding and protection of the shielding layer 201 and the high-voltage outlet shielding layer 20201 can avoid low-voltage windings. 3. Partial discharge of high-voltage winding 2 and high-voltage outlet pile head 202, and has good sealing and waterproof performance, anti-corrosion and anti-rust performance and heat dissipation performance, and can be flexibly applied to underground installations, generally installed in the manholes of trenches or small pits It is not affected by sunlight, and is less affected by climate and environment. It forms a power grid underground with cables. It is a real underground power distribution equipment with good practicability and broad development prospects.

Further, both ends of the low-voltage winding 3 are respectively connected with an incoming copper bar 301 and an outgoing copper bar 302; the incoming copper bar 301 is arranged inside the low-voltage winding 3, and its cross section is rectangular; the The outgoing copper bar 302 is arranged on the outside of the low-voltage winding 3, and its outer surface is arc-shaped; the incoming copper bar 301 and the outgoing copper bar 302 extend outward along the axial direction of the low-voltage winding 3, and The direction of extension is opposite. The incoming copper bar 301 and the outgoing copper bar 302 are reasonably arranged in structure, the connection is stable and firm, and the outer surface of the outgoing copper bar 302 is arc-shaped, which perfectly matches with the outer annular resin layer 4 to prevent local structures on the inner surface of the resin layer 4 to ensure the safety and reliability of use; it can completely avoid the interference of the incoming copper bar 301 and the outgoing copper bar 302 extending outwards, and ensure the convenience and safety of the external cables. In use, the two low-voltage windings 3 are connected in parallel through cables.

Further, the high-voltage outlet pile heads 202 are disposed on the upper and lower parts of the outer side of the high-voltage winding 2 , and are respectively connected to both ends of the high-voltage winding 2 . The high-voltage outlet pile head forms the outlet structure of the high-voltage winding, the structure is simple, the arrangement is reasonable, and the outlet connection is convenient. When in use, the two high-voltage windings 2 are connected in series through cables to achieve relatively stable and reliable voltage transformation.

Further, the high-voltage outlet pile head 202 is seamlessly plugged with the cable plug-in head 5 . The high-voltage outlet pile head 202 is output to the outside through the seamless connection of the cable plug-in head 5, so as to ensure the tightness and safety of the connection.

Further, the shielding layer 201 and the high-voltage outlet shielding layer 20201 both include an inner semiconductor layer 20101 and an outer copper mesh layer 20102. The mesh of the copper mesh layer 20102 is preferably 400 meshes. made. Equipotential is formed by the copper mesh layer 20102, which can prevent the cracking phenomenon caused by unreliable curing with the resin layer 4. The semiconductor layer 20101 can further uniformize the electric field and avoid partial discharge, with good safety and high reliability. For protection performance, the semiconductor layer 20101 is wound through semiconductor paper, which is simple to wind and easy to implement.

Further, after the shielding layer 201 and the shielding layer 20201 of the high-voltage outgoing line are connected, they jointly adopt a one-point grounding form. There is only one ground reference point for one-point grounding, the potential of the entire system is highly consistent, the structure is simple, and the safety is good.

In the body structure of the single-phase directly buried dry-type transformer, the high-voltage winding and the low-voltage winding are formed by vacuum casting with epoxy resin as a whole, and are sleeved on the iron core, between the high-voltage winding and the low-voltage winding, and A resin layer is formed between the high-voltage winding and the shielding layer, and the air insulation and transformer oil insulation are replaced by the resin layer, which has reliable insulation, and its volume is greatly reduced. Partial discharge, and has good sealing and waterproof performance, anti-corrosion and anti-rust performance and heat dissipation performance. Its outlet structure is simple, the design is reasonable, the whole can avoid partial discharge, the use safety is good, and the reliability is high.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments may be referred to each other.

The terms "upper", "lower", "outside", "inside", etc. in the description and claims of the present invention and the above-mentioned drawings, if present, are used to distinguish the relative relationship in position, and are not necessarily qualitative. It is to be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", and any variations thereof, are intended to cover non-exclusive inclusion.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. A body structure of a single-phase direct-buried dry-type transformer, characterized in that it comprises an iron core (1), and an opposite side of the iron core (1) is respectively sleeved with a low-voltage winding (3), so that the A high-voltage winding (2) is provided on the outside of the low-voltage winding (3), and the high-voltage winding (2) and the low-voltage winding (3) are integrally molded by epoxy resin; a shielding layer (201) is provided on the outside of the high-voltage winding (2). ) and a high voltage outlet pile head (202); a high voltage outlet wire shielding layer (20201) is provided on the outside of the high voltage outlet pile head (202). 2. The body structure of the single-phase direct-buried dry-type transformer according to claim 1, wherein the two ends of the low-voltage winding (3) are respectively connected with an incoming copper bar (301) and an outgoing copper bar (302); the incoming copper bar (301) is arranged on the inner side of the low-voltage winding (3), and its cross section is rectangular; the outgoing copper bar (302) is arranged on the outer side of the low-voltage winding (3), and its outer side is in the shape of a rectangle. Curved. 3. The body structure of the single-phase direct-buried dry-type transformer according to claim 1, wherein the high-voltage outlet pile head (202) is arranged on the upper and lower parts of the outer side of the high-voltage winding (2), and is respectively Connect to both ends of the high voltage winding (2). 4. The body structure of a single-phase direct-buried dry-type transformer according to claim 1 or 3, wherein the high-voltage outlet pile head (202) is seamlessly connected with a cable plug-in head (5). 5. The body structure of a single-phase direct-buried dry-type transformer according to claim 1, wherein the shielding layer (201) and the high-voltage outlet shielding layer (20201) both comprise an inner semiconductor layer (20101) and the outer copper mesh layer (20102). 6 . The body structure of the single-phase direct-buried dry-type transformer according to claim 5 , wherein the semiconductor layer ( 20101 ) is wound from semiconductor paper. 7 . 7. The body structure of a single-phase direct-buried dry-type transformer according to claim 1 or 5, characterized in that, the shielding layer (201) and the shielding layer (20201) of the high-voltage outgoing line adopt a one-point grounding form.

Images