CN211045239U - High-voltage isolation transformer with combined insulation structure - Google Patents

Abstract

The utility model provides a combined insulation structure's high voltage isolation transformer belongs to isolation transformer technical field, include: the transformer comprises a bottom plate, an insulating sleeve, a top plate and a grading ring, wherein the insulating sleeve is coiled to form a column shape with an internal installation space, a transformer assembly is suitable to be arranged in the installation space, and insulating gas is suitable to be contained in a pipe of the insulating sleeve; the utility model discloses a high-voltage isolation transformer adopts the form that gas insulation and solid insulation combine, wherein the main insulation of solid insulation as high-pressure isolation, gas insulation is as the auxiliary insulation who promotes transformer edge insulation characteristic, this structure can expand to voltage class more than 35kV in a flexible way, compare with conventional dry-type transformer, have higher dielectric strength, low partial discharge restraines, low noise, high heat dissipation, can realize isolation transformer and use under the high voltage of direct current more than hundred kilovolts, satisfy the long-term reliable application under direct current voltage or the alternating voltage.

Description

High-voltage isolation transformer with combined insulation structure

Technical Field

The utility model relates to an isolation transformer technical field, concretely relates to combined insulation structure's high voltage isolation transformer.

Background

A high-voltage isolation transformer is a transformer in which the primary side (primary side) and the secondary side (secondary side) of a winding coil are isolated from each other by a certain insulation measure, and an input winding and an output winding are electrically separated from each other.

With the development of direct-current transmission design, some novel devices, such as direct-current circuit breakers and the like, appear in a direct-current system, and the devices are passive devices and need external energy supply, so that the requirements on isolation transformers are provided. The passive power equipment can not obtain energy on line through high potential, so the energy is required to be obtained from a low-voltage station power utilization system through a high-voltage isolation transformer and then is sent to the high potential, and the adopted high-voltage isolation transformer not only needs to realize electric energy transmission but also needs to realize high-voltage isolation so as to meet the high-voltage isolation energy-obtaining requirement of the passive power equipment.

The insulation structures of prior art power transformers are typically designed with a single insulation medium, such as oil insulation, gas insulation or solid insulation, e.g. dry transformers, typically filled with epoxy resin plus silica sand poured solid insulation.

However, the common dry-type isolation transformer adopts epoxy solid insulating materials, has the problem of space charge accumulation under direct current voltage, is easy to discharge to cause insulation breakdown, and meanwhile, the current dry-type isolation transformer has the application voltage of 35kV and low voltage level, and cannot be applied to more than hundred kilovolts. The traditional oil transformer meets the requirements on performance, but has fire risks and does not meet application conditions. In addition, the gas insulation isolation transformer needs 3-5 atmospheres of gas pressure, the transformer needs to be designed with a complex explosion-proof structure for realizing explosion-proof design, meanwhile, gas has leakage risk, and once the gas leaks, the gas insulation performance is reduced, and the transformer can also generate insulation breakdown.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the isolation transformer among the prior art, because the single insulation design that insulation system adopted leads to unable using to the defect of hundred kilovolts above grades to a combination insulation system's high voltage isolation transformer is provided.

In order to solve the technical problem, the utility model provides a combination insulation system's high voltage isolation transformer, include:

a base plate;

the insulating sleeve is connected above the bottom plate and is suitable for containing insulating gas; the insulating sleeve is coiled to form a column shape with an inner installation space, and a transformer assembly is suitable to be arranged in the installation space;

the top plate is connected above the insulating sleeve;

and the equalizing ring is detachably connected to the top plate.

Preferably, the transformer assembly comprises at least one transformer module.

Preferably, the transformer module includes:

a support;

the low-voltage winding is arranged on the bracket, and the wire outlet end of the low-voltage winding is connected with the bracket;

the high-voltage winding is arranged on the bracket and is associated with the low-voltage winding through a space magnetic field; and the outlet end of the high-voltage winding extends upwards and is suitable for extending out of the top plate.

Preferably, the transformer module further includes: and the supporting insulator is vertically connected above the bracket and is suitable for being connected with the top plate.

Preferably, the supporting insulator is provided with a plurality of supporting insulators, and a capacitor and a resistor device are arranged in at least one supporting insulator to form a resistor-capacitor voltage-sharing device.

Preferably, the transformer assembly comprises a plurality of transformer modules which are sequentially connected in series from top to bottom, and every two adjacent transformer modules are connected at intervals through the supporting insulator.

Preferably, the transformer assembly further includes: and the connecting bus bar is connected between the wire outlet end of the low-voltage winding of the upper-layer transformer module and the wire outlet end of the high-voltage winding of the lower-layer transformer module.

Preferably, the stent includes:

the supporting clamping pieces are provided with two groups which are symmetrical left and right;

the iron core assembly is connected between the two groups of supporting clamping pieces;

and the two low-voltage connecting plates are vertically connected to the two groups of supporting clamping pieces respectively, and are connected with the supporting clamping pieces at intervals through transverse insulators.

Preferably, the high voltage winding comprises:

the insulating casting body is of a hollow cylindrical structure and is suitable for being transversely arranged;

an insulating terminal having two terminals arranged in parallel on a side wall of the insulating cast body;

and the high-voltage coil terminal is arranged in the insulating casting body and partially extends out of the insulating casting body through the insulating terminal.

Preferably, two ends of the insulating casting body are connected between the supporting clamping pieces through cushion blocks.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a high-voltage isolation transformer of combined insulation structure adopts the form that gas insulation and solid insulation combine, and wherein the transformer subassembly adopts solid insulation as the main insulation of high-voltage isolation, adopts gas insulation as the auxiliary insulation of the insulating characteristic of lifting transformer edgewise in the insulation support, and under equal voltage class and capacity, this design can reduce the area of transformer by a wide margin, makes the structure compacter, also is favorable to reducing the cost of transformer; in addition, the structure can be flexibly expanded to the voltage class of more than 35kV, compared with the conventional dry-type transformer, the structure has higher insulating strength, low partial discharge inhibition, low noise and high heat dissipation, can realize the application of the isolation transformer under the direct current high voltage of hundreds of kilovolts and more, and meets the long-term reliable application under the direct current voltage or the alternating current voltage.

2. The utility model provides a high voltage isolation transformer of combination insulation system can constitute by one or a plurality of transformer module unit in internal structure, and concrete quantity can be according to the application voltage level adjustment.

3. The utility model provides a high voltage isolation transformer of combined insulation structure, in the transformer module, at least one support insulator's inside is provided with electric capacity and resistance device in order to constitute resistance-capacitance voltage-sharing device to realize the voltage-sharing under the voltage of transient steady state.

4. The utility model provides a high-voltage isolation transformer with a combined insulation structure, which adopts the design of a multi-transformer module series structure, can be applied at different voltage levels, can be expanded and applied under different voltage forms and voltage levels, and has the characteristic of low partial discharge when applied to an alternating current system; in the application of a direct current system, space charge accumulation under direct current can be avoided.

5. The utility model provides a high-voltage isolation transformer with a combined insulation structure, the insulation casting body of a high-voltage winding is cast and encapsulated by adopting a solid insulation material, so that high-voltage isolation, partial discharge inhibition and space charge inhibition can be realized; the auxiliary gas is insulated, and the insulating gas can keep the requirement of insulating and isolating the edge surface of the transformer under certain pressure, thereby reducing the requirement of external pollution on the creepage distance of the edge surface of the transformer.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of a three-dimensional structure of a high-voltage isolation transformer with a combined insulation structure according to the present invention.

Fig. 2 is a perspective view of one embodiment of the transformer assembly of fig. 1 inside an insulation sleeve.

Fig. 3 is a schematic perspective view of a combination of two transformer modules in fig. 2.

Fig. 4 is a schematic perspective view of a transformer module.

Fig. 5 is a schematic perspective view of the high-voltage winding.

Description of reference numerals:

1. a top plate; 2. a grading ring; 3. an insulating sleeve; 4. a base plate; 5. a support; 6. a high voltage winding; 7. a support insulator; 8. connecting a busbar; 9. a support clamp; 10. an iron core assembly; 11. a low voltage winding; 12. a low-voltage connection plate; 13. a transverse insulator; 14. cushion blocks; 15. an insulating cast body; 16. an insulated terminal; 17. a high voltage coil terminal.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. 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.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

The present embodiment provides a high voltage isolation transformer with a combined insulation structure, as shown in fig. 1, which is an external structure of the high voltage isolation transformer, and includes: the structure comprises a top plate 1, a grading ring 2, an insulating sleeve 3 and a bottom plate 4, which are connected to form a whole. Wherein, insulation support 3 connects the top of bottom plate 4, roof 1 connects the top of insulation support 3, equalizer ring 2 passes through bolt detachably and connects on roof 1.

The insulating sleeves 3 are wound to form a cylindrical shape with an installation space formed therein, in which a transformer assembly is adapted to be arranged. The single tube of the bushing 3 is suitably filled with an insulating gas, which may be the one commonly used in electrical equipment today: such as sulfur hexafluoride (SF6), mixtures of SF6 with other gases, nitrogen, etc.; the pressure of the insulating gas may be slightly positive, i.e. slightly above atmospheric pressure, or several times atmospheric pressure.

As shown in fig. 2, the internal structure of the high voltage isolation transformer, that is, the transformer assembly disposed in the installation space of the insulating sleeve 3, includes a plurality of transformer modules connected in series in sequence from top to bottom, wherein two adjacent transformer modules are connected at intervals by supporting insulators 7. In addition, as an alternative embodiment, the transformer assembly may also have only one transformer module.

As shown in fig. 3, the transformer module includes: the low-voltage winding 11 and the high-voltage winding 6 are arranged on the bracket 5. The outlet end of the high-voltage winding 6 extends upwards, and the outlet end of the high-voltage winding 6 positioned at the topmost end extends upwards out of the top plate 1 and is used as a general external outlet connecting terminal of the high-voltage isolation transformer. The low-voltage winding 11 is fixed on one arm of the iron core assembly 10 and is arranged coaxially with the high-voltage winding 6, and is used for enabling the low-voltage winding 11 and the high-voltage winding 6 to be associated through a space magnetic field; the core assembly 10 is both part of the frame 5 and a support member for the connection between adjacent frames 5.

When the transformer module is provided with a plurality of transformer modules which are sequentially connected in series from top to bottom, the transformer module also comprises a supporting insulator 7; the supporting insulators 7 can be provided with four symmetrical groups, the four groups of supporting insulators 7 are respectively and vertically connected above the support 5 in a rectangular mode, and the supporting insulators 7 can be used for connecting two transformer modules and can also be used for being connected between the support 5 and the top plate 1. When the supporting insulator 7 is positioned above the topmost bracket 5, the top end of the supporting insulator 7 is used for being connected with the top plate 1; the top ends of the support insulators 7 are intended to be used as spacer connections between the transformer modules of the respective layer when the support rims are located on the brackets 5 of the intermediate layer.

And a connecting bus bar 8 is further arranged between each layer of transformer module, and the connecting bus bar 8 is used for connecting the wire outlet end of the low-voltage winding 11 positioned on the upper layer of transformer module and the wire outlet end of the high-voltage winding 6 positioned on the lower layer of transformer module.

Of the four groups of supporting insulators 7 on each layer, two supporting insulators 7 on the side of the bracket 5 close to the low-voltage winding 11 are internally provided with a capacitor and a resistor device to form a resistor-capacitor voltage-sharing device.

As shown in fig. 4, the holder 5 includes: bilateral symmetry's two sets of support folder 9, connect the iron core subassembly 10 between two sets of support folder 9 and respectively vertically connect two sets of support two low pressure connecting plates 12 on the folder 9, and, low pressure connecting plate 12 through horizontal insulator 13 with support folder 9 interval connection, two leading-out terminals on the low voltage winding 11 respectively with two low pressure connecting plates 12 on the support 5 are connected.

As shown in fig. 5, the high voltage winding 6 includes: the transformer comprises an insulation pouring body 15, an insulation terminal 16 and a high-voltage coil terminal 17, wherein the insulation pouring body 15 is of a hollow cylindrical structure and is suitable for being transversely arranged on a bracket 5, and when the transformer is arranged, two ends of the insulation pouring body 15 are connected between two groups of support clamping pieces 9 of the bracket 5 through cushion blocks 14; the insulating terminals 16 are provided with two parallel upward side walls of the insulating casting body 15; the high-voltage coil terminal 17 is arranged in the insulating casting 15 and partially protrudes out of the insulating casting 15 through the insulating terminal 16. The insulation casting 15 is the insulation of the high-voltage winding 6 from the low-voltage winding 11 and the core potential, and is also the structural support body of the high-voltage winding 6. The insulating casting body 15 is a cylinder which is hollow and insulated inside, the high-voltage coil is sleeved on the insulating casting body 15, a plurality of concentric turns are wound on the high-voltage coil, the insulating sleeve 3 is formed on the periphery of the high-voltage coil through injection molding, and the insulating terminal 16 is wrapped on the periphery of the high-voltage coil terminal 17 extending out of the insulating sleeve 3, so that the high-voltage winding 6 is integrally formed.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (10)

1. A high-voltage isolation transformer with a combined insulation structure is characterized by comprising:

a base plate (4);

an insulating sleeve (3) connected above the bottom plate (4) and adapted to contain an insulating gas therein; the insulating sleeve (3) is coiled to form a cylinder shape with an inner installation space, and the installation space is suitable for arranging a transformer assembly;

the top plate (1) is connected above the insulating sleeve (3);

and the equalizing ring (2) is detachably connected to the top plate (1).

2. The high voltage isolation transformer of claim 1, wherein the transformer assembly comprises at least one transformer module.

3. The high voltage isolation transformer of claim 2, wherein the transformer module comprises:

a bracket (5);

the low-voltage winding (11) is arranged on the bracket (5), and the outlet end of the low-voltage winding is connected with the bracket (5);

the high-voltage winding (6) is arranged on the bracket (5) and is associated with the low-voltage winding (11) through a space magnetic field; the outlet end of the high-voltage winding (6) extends upwards and is suitable for extending out of the top plate (1).

4. The high voltage isolation transformer of claim 3, wherein the transformer module further comprises: and the supporting insulator (7) is vertically connected above the bracket (5) and is suitable for being connected with the top plate (1).

5. The high voltage isolation transformer according to claim 4, wherein said supporting insulators (7) are provided in plurality, at least one of said supporting insulators (7) being internally provided with capacitive and resistive means to constitute resistive-capacitive voltage grading means.

6. The high-voltage isolation transformer of claim 4, wherein the transformer assembly comprises a plurality of transformer modules connected in series one above the other, and two adjacent transformer modules are connected at intervals through the supporting insulator (7).

7. The high voltage isolation transformer of claim 6, wherein the transformer assembly further comprises: and the connecting bus bar (8) is connected between the outlet end of the low-voltage winding (11) of the upper-layer transformer module and the outlet end of the high-voltage winding (6) of the lower-layer transformer module.

8. The high voltage isolation transformer according to claim 3, wherein the bracket (5) comprises:

the supporting clamping pieces (9) are provided with two groups which are symmetrical left and right;

a core assembly (10) connected between the two sets of support clamps (9);

the two low-voltage connecting plates (12) are respectively vertically connected to the two groups of supporting clamping pieces (9), and the low-voltage connecting plates (12) are connected with the supporting clamping pieces (9) at intervals through transverse insulators (13).

9. The high voltage isolation transformer according to claim 8, wherein the high voltage winding (6) comprises:

an insulating casting body (15) having a hollow cylindrical structure and adapted to be arranged laterally;

an insulating terminal (16) having two terminals arranged in parallel on a side wall of the insulating cast body (15);

a high voltage coil terminal (17) disposed within the insulating casting (15) and partially protruding out of the insulating casting (15) through the insulating terminal (16).

10. The high voltage isolation transformer according to claim 9, wherein the insulating casting (15) is connected at both ends between the support clamps (9) by means of spacers (14).

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