CN211045235U - High-voltage cascade isolation transformer with solid insulation structure - Google Patents
High-voltage cascade isolation transformer with solid insulation structure Download PDFInfo
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- CN211045235U CN211045235U CN201922495100.7U CN201922495100U CN211045235U CN 211045235 U CN211045235 U CN 211045235U CN 201922495100 U CN201922495100 U CN 201922495100U CN 211045235 U CN211045235 U CN 211045235U
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- 238000002955 isolation Methods 0.000 title claims abstract description 47
- 238000009413 insulation Methods 0.000 title claims abstract description 39
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- 238000004806 packaging method and process Methods 0.000 claims description 9
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- PMVSDNDAUGGCCE-TYYBGVCCSA-L Ferrous fumarate Chemical group [Fe+2].[O-]C(=O)\C=C\C([O-])=O PMVSDNDAUGGCCE-TYYBGVCCSA-L 0.000 description 1
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- 239000003822 epoxy resin Substances 0.000 description 1
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- 238000001746 injection moulding Methods 0.000 description 1
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Abstract
The utility model provides a high-voltage cascade isolation transformer of solid insulation structure belongs to isolation transformer technical field, include: at least one transformer module, the transformer module has two cascaded connection's that set up side by side sub-transformer unit, sub-transformer unit includes: the high-voltage winding is of a solid insulation structure; the low-voltage winding is coaxially arranged with the high-voltage winding; the low-voltage windings of the two sub-transformer units are connected in series; the utility model discloses a high-pressure cascade isolation transformer of solid insulation structure adopts the applicable insulating material under DC voltage, adopts semiconductor shielding, main insulation pouring technique stage by stage, can realize that the low partial discharge design and the high insulation of transformer are endured, adopts cascade connection's mode simultaneously, forms unit modular structure, can use according to different voltage level extensions. The power supply from the ground potential to tens of kilovolts or even hundreds of kilovolts and higher potential can be realized, and the ground isolation of high potential can be realized.
Description
Technical Field
The utility model relates to an isolation transformer technical field, concretely relates to isolation transformer is cascaded to solid insulation structure's high pressure.
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 to be supplied with energy from the outside; the devices contain a large number of power components to be powered, and the direct current devices cannot obtain energy from a direct current system, so that external energy supply is needed, and the external energy supply device needs to have several characteristics: (1) the electric energy can be transmitted from the ground potential to the high potential, and the potential distribution and the performance of the direct current passive equipment cannot be influenced by the electric energy transmission; (2) the isolation of direct current voltage can be realized, and the transient voltage impact of a system can be borne; (3) various direct current effects such as space charge accumulation, electrostatic dust collection under direct current and the like caused by direct current voltage can be avoided; (4) most importantly, oil insulation cannot be adopted like a conventional transformer, so that the fire risk is avoided. Thus, a need has arisen for an isolation transformer.
High voltage power transformers are currently used mainly in the ac field and there are various types of transformers, which are subjected to mainly ac voltages. In order to realize voltage isolation and provide necessary main insulation, an oil-immersed transformer is basically adopted in a common transformer more than 35kV applied in the power field, and therefore fire risks exist, and the transformer cannot be used as an isolation transformer of direct-current passive equipment. For transformers of 35kV and below, although solid insulation structure design is adopted, epoxy resin is generally adopted as the solid insulation material, the problems of large local discharge and serious space charge accumulation exist under direct current voltage, and the voltage grade is too low to meet the application requirements. Although the transformer is designed without oil, the gas pressure reaches over 0.5MPa to ensure insulation, but the transformer has the risk of gas leakage in the operation process and is difficult to operate and maintain.
Aiming at the common technical level and the design method of the current power transformer and the existing adverse factors of voltage grade expansion, a solid insulation high-voltage direct-current isolation transformer needs to be newly designed according to the application requirements of the transformer on high voltage and special application working conditions.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model discloses a aim at providing a novel solid insulation structure's high pressure cascades isolation transformer to realize isolation transformer and use under hundreds of kilovolts and above direct current high pressure, have characteristics such as low partial discharge, space charge height restrain simultaneously, use with the long-term reliability under the satisfying direct current voltage.
In order to solve the technical problem, the utility model provides a high-pressure cascade isolation transformer of solid insulation structure, include: at least one transformer module, the transformer module has two cascaded connection's that set up side by side sub-transformer unit, sub-transformer unit includes:
the high-voltage winding is of a solid insulation structure;
the low-voltage winding is coaxially arranged with the high-voltage winding;
and the low-voltage windings of the two sub-transformer units are connected in series.
Preferably, the transformer modules are in cascade connection, the plurality of transformer modules are stacked at intervals in the height direction, and a resistance-capacitance voltage-sharing device is connected between every two adjacent transformer modules.
Preferably, the resistance-capacitance voltage-sharing device is connected to the outer side of the transformer module.
Preferably, the resistance-capacitance voltage equalizing device comprises: the packaging insulation cylinder is connected with an end equalizing ring outside the packaging insulation cylinder, and an equalizing capacitor and an equalizing resistor are arranged in the packaging insulation cylinder.
Preferably, the plurality of transformer modules are supported by support insulator columns.
Preferably, the support insulator columns are provided with four groups which are symmetrically arranged.
Preferably, a support insulator column is adopted to support the lower part of the transformer module at the lowest layer.
Preferably, a supporting frame is arranged below the transformer module at the lowest layer at intervals in the height direction, and a resistance-capacitance voltage-sharing device is connected between the supporting frame and the transformer module.
Preferably, the method further comprises the following steps:
and the oblique-pulling insulator is obliquely arranged and connected between the two adjacent layers of the transformer modules.
Preferably, a shielding cover is arranged above the uppermost transformer module at intervals in the height direction, the shielding cover is supported above the transformer module through a supporting insulator column, and a resistance-capacitance voltage-sharing device is connected between the shielding cover and the transformer module.
The utility model discloses technical scheme has following advantage:
1. the utility model provides a high-voltage cascade isolation transformer of solid insulation structure adopts the applicable insulating material under DC voltage, adopts semiconductor shielding, main insulation pouring technique stage by stage, can realize that the low partial discharge design and the high insulation of transformer are endured, adopts cascade connection's mode simultaneously, forms unit modular structure, can use according to different voltage level extensions. The power supply from the ground potential to tens of kilovolts or even hundreds of kilovolts and higher potential can be realized, and the ground isolation of high potential can be realized.
2. The utility model provides a high-voltage cascade isolation transformer of solid insulation structure, except having dry-type transformer's all functional characteristics, still have nimble extension, compact structure, fire prevention explosion-proof good performance etc. a great deal of advantage that high voltage used, still can expand to voltage class more than 35kV in a flexible way simultaneously, compare with conventional dry-type transformer, have advantages such as higher dielectric strength, low partial discharge suppression, low noise, high heat dissipation.
3. The utility model provides a high-voltage cascade isolation transformer of solid insulation structure can realize having low partial discharge characteristics in direct current system's application, has very low space charge accumulation simultaneously under direct current voltage. The design takes a basic high-voltage winding sleeve as a basic insulation structure unit, adopts a unit modular structure design, and realizes the expansion application of different voltage grades through an electrical cascade connection form.
4. The utility model provides a high-voltage cascade isolation transformer of solid insulation structure has independent structure's transformer module, has contained two high-voltage winding sleeve pipes, two low voltage winding, iron core structure and attached bearing structure, structurally assembles into a structure wholly. One high-voltage winding sleeve of the transformer module corresponds to one low-voltage winding to form a complete sub-transformer unit, so that one transformer module actually comprises two sub-transformer units which are connected in a cascade mode.
5. The utility model provides a high-voltage cascade isolation transformer of solid insulation structure, in order to realize higher direct current voltage level and use, structurally make a whole with the transformer module, cascade connection on electrical connection, it is whole to form a high-voltage cascade isolation transformer. Because a plurality of transformers are connected in cascade, voltage-sharing design is needed under high voltage, and therefore a resistance-capacitance voltage-sharing device is connected beside each transformer module of the high-voltage cascade isolation transformer in parallel to realize voltage sharing under the transient and steady voltage. In order to realize the application of the high-voltage cascade isolation transformer under high voltage and inhibit corona discharge under high voltage, a shielding cover is added on the periphery of the transformer to realize the optimization and inhibition of distortion field intensity under high voltage.
6. The utility model provides a high-pressure cascade isolation transformer of solid insulation construction compares in traditional dry-type transformer at insulating isolation, partial discharge restrain, applied voltage level low, a great deal of technical limitation such as the extension application is inflexible, the utility model discloses a evaded traditional dry-type transformer's design limitation in the design, through the design implementation method of innovation, restrained the inside partial discharge of solid insulation, controlled outside space field intensity, solved DC voltage's space charge accumulation, compact structure, easily extension. And moreover, the power supply device not only can supply power to passive power electronic equipment in an isolated mode, but also can be expanded to the field of conventional alternating current power transmission.
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 perspective view of an embodiment of the high-voltage cascaded isolation transformer with a solid insulation structure according to the present invention.
Fig. 2 is a schematic perspective view of a transformer module.
Fig. 3 is an electrical connection diagram of the transformer module in fig. 2.
Fig. 4 is a schematic perspective view of the high-voltage winding.
Description of reference numerals:
1. a transformer module; 2. supporting the insulator post; 3. a resistance-capacitance voltage-sharing device; 4. packaging the insulating cylinder; 5. an end grading ring; 6. a shield case; 7. a cable-stayed insulator; 8. a sub-transformer unit; 9. a high voltage winding; 10. a low voltage winding; 11. connecting a busbar; 12. a voltage-equalizing cover; 13. a main body insulating structure; 14. the edge surface is insulated with an umbrella skirt.
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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
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 specific implementation of a high-voltage cascaded isolation transformer with a solid insulation structure.
As shown in figure 1, the high-voltage cascade isolation transformer is formed by stacking n (n is more than or equal to 1) transformer modules 1 in the height direction, and a certain air clearance is reserved between every two adjacent transformer modules 1 so as to realize electrical insulation isolation under high voltage. Two adjacent transformer modules 1 are supported by supporting insulator columns 2, and the primary transformer module 1 at the lowest layer is also supported by the supporting insulator columns 2 to a certain height, so that the ground insulation isolation of the primary transformer module 1 is realized.
A resistance-capacitance voltage sharing device 3 is fixedly suspended on the outer side of the transformer module 1, and the resistance-capacitance voltage sharing device 3 is used for connecting the transformer module 1 between the upper layer and the lower layer; the resistance-capacitance voltage-sharing device 3 is composed of a voltage-sharing capacitor, a voltage-sharing resistor, a packaging insulating cylinder 4 and an end voltage-sharing ring 5. In the embodiment, the suspended resistance-capacitance voltage-sharing device 3 is adopted, so that the occupied area of the transformer can be reduced, and the replacement and maintenance are facilitated.
A shielding case 6 is arranged on the top of the high-voltage cascade isolation transformer, and the shielding case 6 is used for realizing the electric field uniformity and corona suppression of the isolation transformer under high voltage.
In order to ensure the structural stability of the high-voltage cascade isolation transformer and meet the requirement of seismic fortification intensity, a diagonal insulator 7 is connected between each layer of transformer module 1 for realizing structural reinforcement.
As shown in fig. 2, the transformer module 1 includes: two cascaded sub-transformer units 8 arranged in parallel, both sub-transformer units 8 having: the high-voltage winding 9 and the low-voltage winding 10 which is coaxial with the high-voltage winding 9 are arranged, the winding directions of the two high-voltage windings 9 are opposite, and the two low-voltage windings 10 are electrically connected through a connecting bus bar 11. In the external structural arrangement, the direction of the outlet terminals of the two high-voltage windings 9 is opposite up and down, wherein the outlet terminal of one high-voltage winding 9 is the inlet terminal of the first sub-transformer unit 8, and the outlet terminal of the other high-voltage winding 9 is the outlet terminal of the second sub-transformer unit 8;
the transformer module 1 further comprises a core assembly and a voltage-sharing cover 12. The iron core assembly comprises an iron core lamination and a clamping piece for ensuring the clamping and the structural strengthening of the iron core disc. This iron core subassembly sets up inside the 9 sleeve pipes of high voltage winding, and coaxial low voltage winding 10 of having arranged on the iron core subassembly, low voltage winding 10 uses the iron core subassembly as the support chassis, the snap-on the arm of iron core.
As shown in fig. 3, two sub-transformer units 8 are connected in series, wherein a high-voltage winding 9 on one iron core arm and a low-voltage winding 10 coaxial with the high-voltage winding form one sub-transformer unit 8, the incoming end of the sub-transformer unit 8 is the high-voltage winding 9, and the outgoing end is the low-voltage winding 10; the low-voltage winding 10 of the sub-transformer unit 8 is connected to the low-voltage winding 10 of the second sub-transformer unit 8, so that the incoming line end of the second sub-transformer unit 8 is the low-voltage winding 10, and the outgoing line end is the high-voltage winding 9. The two sub-transformer units 8 are connected in series, and the effect of doubling the voltage level can be achieved.
As shown in fig. 4, the high voltage winding 9 is a bushing structure, and a solid insulating material suitable for dc voltage, such as silicon rubber or ethylene propylene diene monomer, is applied, and the high voltage winding 9 is integrally cast by a high voltage injection molding process. Specifically, the bushing comprises a high-voltage winding 9 poured inside by a solid insulating material, a main body insulating structure 13 and a surface insulating shed 14, wherein the main body insulating structure 13 realizes the insulating isolation of the high-voltage winding 9 to a low potential, and the surface insulating shed 14 is surface insulating tolerance which is necessary to ensure the dirt accumulation in the operation process under the direct-current voltage.
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 cascade isolation transformer of a solid insulation structure, comprising: at least one transformer module (1), the transformer module (1) having two cascade-connected sub-transformer units (8) arranged in parallel, the sub-transformer units (8) comprising:
the high-voltage winding (9) is of a solid insulation structure;
a low-voltage winding (10) arranged coaxially with the high-voltage winding (9);
the low-voltage windings (10) of the two sub-transformer units (8) are connected in series.
2. The high-voltage cascade isolation transformer according to claim 1, wherein the transformer modules (1) are connected in cascade, a plurality of the transformer modules (1) are stacked at intervals in the height direction, and a resistance-capacitance voltage-sharing device (3) is connected between two adjacent transformer modules (1).
3. The high voltage cascaded isolation transformer according to claim 2, wherein the RC voltage grading device (3) is connected outside the transformer module (1).
4. The high-voltage cascade isolation transformer according to claim 3, wherein the RC voltage-sharing device (3) comprises: the packaging insulation barrel comprises a packaging insulation barrel (4) and an end equalizing ring (5) connected to the outside of the packaging insulation barrel (4), wherein an equalizing capacitor and an equalizing resistor are arranged in the packaging insulation barrel (4).
5. The high voltage cascaded isolation transformer according to claim 2, wherein a plurality of the transformer modules (1) are supported by support insulator columns (2) therebetween.
6. The high voltage cascaded isolation transformer of claim 5, wherein the support insulator pillars (2) have four symmetrically arranged groups.
7. The high voltage cascaded isolation transformer according to claim 2, wherein the transformer module (1) located at the lowermost layer is supported below with a support insulator pillar (2).
8. The high-voltage cascade isolation transformer according to claim 7, wherein a supporting frame is arranged below the lowest transformer module (1) at intervals in the height direction, and a resistance-capacitance voltage-sharing device (3) is connected between the supporting frame and the transformer module (1).
9. The high voltage cascaded isolation transformer of claim 2, further comprising:
and the oblique pull insulators (7) are obliquely arranged and connected between the two adjacent layers of the transformer modules (1).
10. The high-voltage cascade isolation transformer according to claim 2, wherein a shielding cover (6) is arranged above the uppermost transformer module (1) at an interval in the height direction, the shielding cover (6) is supported above the transformer module (1) through a support insulator column (2), and a resistance-capacitance voltage-sharing device (3) is connected between the shielding cover and the transformer module (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922495100.7U CN211045235U (en) | 2019-12-31 | 2019-12-31 | High-voltage cascade isolation transformer with solid insulation structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922495100.7U CN211045235U (en) | 2019-12-31 | 2019-12-31 | High-voltage cascade isolation transformer with solid insulation structure |
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| CN211045235U true CN211045235U (en) | 2020-07-17 |
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| CN201922495100.7U Active CN211045235U (en) | 2019-12-31 | 2019-12-31 | High-voltage cascade isolation transformer with solid insulation structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022160135A1 (en) * | 2021-01-27 | 2022-08-04 | 华为技术有限公司 | Isolation transformer and power converter |
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- 2019-12-31 CN CN201922495100.7U patent/CN211045235U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022160135A1 (en) * | 2021-01-27 | 2022-08-04 | 华为技术有限公司 | Isolation transformer and power converter |
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