CN110890203A - 110kV oil-immersed power transformer high-voltage winding interphase main insulation structure and structure optimization method thereof - Google Patents
110kV oil-immersed power transformer high-voltage winding interphase main insulation structure and structure optimization method thereof Download PDFInfo
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- CN110890203A CN110890203A CN201911368374.8A CN201911368374A CN110890203A CN 110890203 A CN110890203 A CN 110890203A CN 201911368374 A CN201911368374 A CN 201911368374A CN 110890203 A CN110890203 A CN 110890203A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
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Abstract
The invention provides an interphase main insulation structure of a high-voltage winding of a 110kV oil-immersed power transformer, which comprises a first high-voltage winding and a second high-voltage winding, wherein each high-voltage winding is provided with a coil screen, and each high-voltage winding comprises a first layer of cake, a middle layer of cake and a last layer of cake, and is characterized in that: and the distance between the first layer cake and the middle layer cake of the first high-voltage winding and the first layer cake and the middle layer cake of the second high-voltage winding is greater than the distance between the last layer cake of the first high-voltage winding and the last layer cake of the second high-voltage winding. The invention can solve the problem of interphase main insulation of the high-voltage winding of the transformer by simple structure, convenient operation and lower cost.
Description
Technical Field
The invention relates to the field of power transformers, in particular to an interphase main insulation structure of a high-voltage winding of a 110kV oil-immersed power transformer.
Background
At present, a 110kV oil-immersed on-load voltage regulation power transformer is generally of an A, B, C three-phase integrated structure, and each phase winding is arranged from inside to outside as a low-voltage winding, a voltage regulation winding and a high-voltage winding. Because the three-phase high-voltage windings are arranged outside, the high-voltage windings A and B of each phase are adjacent to each other pairwise, and the distance between the high-voltage windings A and B is the main insulation distance D between phases. The main insulation distance between phases of the high voltage winding is determined by the insulation level of the high voltage winding. The insulation level of the high-voltage winding is 480kV of full-wave impulse voltage and 200kV of short-time power frequency voltage. Accordingly, the insulation level is that the current main insulation distance between the high-voltage coil and the low-voltage coil is 35mm, and a specific structure for dividing the main distance D of 35mm by the phase partition plate 8 and the coil screen 9 which play an insulation role is shown in fig. 1.
However, the above-described insulating structure has various drawbacks: firstly, the structure is too complicated, and the production efficiency is influenced. And secondly, the cost is increased, and the market competitiveness of the product is reduced. Thirdly, the winding distance is large, and the transformer loss is increased.
In view of the above, there is a need to provide a new transformer high-voltage winding interphase main insulation structure, which solves the above-mentioned drawbacks while ensuring safe and reliable operation of the product.
Disclosure of Invention
The invention aims to provide a 110kV oil-immersed power transformer high-voltage winding interphase main insulation structure which can solve the problem of the interphase main insulation of the high-voltage winding of the transformer with a simple structure, convenient operation and low cost.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides an interphase main insulation system of 110kV oil-immersed power transformer high-voltage winding, its includes first high-voltage winding and second high-voltage winding, is provided with the coil screen on every high-voltage winding, and every high-voltage winding includes first layer cake, well layer cake and end layer cake, the distance between first layer cake, well layer cake of first high-voltage winding and the first layer cake of second high-voltage winding, well layer cake is greater than the distance between the end layer cake of first high-voltage winding and the end layer cake of second high-voltage winding.
As a further improved technical scheme of the invention, the main insulation distance between the first high-voltage winding and the second high-voltage winding is 30 mm.
As a further improved technical scheme of the invention, the insulation weak position on the outer diameter side of the first layer of cake is additionally coated with a small angle ring of 1mm and an outer pad of 2 mm.
As a further improved technical scheme of the invention, an outer cushion of 3mm is added at the insulation weak position on the outer diameter side of the middle layer cake.
The invention also provides a method for optimizing the interphase main insulation structure of the high-voltage winding of the 110kV oil-immersed power transformer,
firstly, establishing a calculation model of a solving area related to an insulation structure of the transformer, setting a main insulation distance between a first high-voltage winding and a second high-voltage winding to be 30mm, and performing discretization processing by using a Laplace equation;
secondly, according to the material properties of a lead and an insulating material used by the transformer, a 1mm small angle ring and a 2mm outer pad are additionally wrapped at the insulation weak position of the outer diameter side of the first layer of cake, and a 3mm outer pad is additionally arranged at the insulation weak position of the outer diameter side of the middle layer of cake;
step three, appointing to solve boundary conditions, and setting the potentials of a high-voltage coil and a low-voltage coil;
and fourthly, in an oil-paper insulation system, by utilizing an oil volume effect principle of an oil-immersed transformer and adopting an insulation structure with a thin paper tube and a small oil gap, establishing mathematical models of different main insulation distances and different oil gap divisions according to the three steps to perform simulation analysis, and adjusting unreasonable insulation structure types and sizes according to calculation results of electric field intensity, power line distribution and safety margin of different models.
The invention has the beneficial effects that: by utilizing the oil volume effect principle of the oil-immersed transformer and adopting the insulating structure of the thin paper tube with small oil gap, mathematical models of different main insulating distances and different oil gap divisions are established for simulation analysis. And adjusting the unreasonable insulation structure type and size according to the calculation results of the electric field intensity of different models, the power line distribution and the safety margin.
Drawings
FIG. 1 is a schematic diagram of an insulation structure of an upper end part between phases of a high-voltage winding of a 110kV oil-immersed power transformer in the prior art;
FIG. 2 is a schematic diagram of an interphase insulation structure of a high-voltage winding of the 110kV oil-immersed power transformer;
FIG. 3 is a simulation diagram of the insulation structure of the transformer high-voltage winding after the interphase insulation structure is optimized.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
Terms such as "upper," "above," "lower," "below," and the like, used herein to denote relative spatial positions, are used for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. The spatially relative positional terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. Also, it should be understood that, although the terms first, second, etc. may be used herein to describe various elements or structures, these described elements should not be limited by these terms. These terms are only used to distinguish these descriptive objects from one another.
As shown in fig. 1 to 3, the 110kV oil-immersed power transformer high-voltage winding interphase main insulation structure comprises a first high-voltage winding a and a second high-voltage winding B, each high-voltage winding is provided with a coil screen 8, each high-voltage winding comprises a first layer cake 4, a middle layer cake 5 and a last layer cake 6, and a distance D1 between the first layer cake 14 and the middle layer cake 15 of the first high-voltage winding a and the first layer cake 24 and the middle layer cake 25 of the second high-voltage winding B is greater than a distance D2 between the last layer cake 16 of the first high-voltage winding a and the last layer cake 26 of the second high-voltage winding B.
In the embodiment 1, as shown by comparing fig. 1 and fig. 3, the main insulation distance D between the phases of the first high-voltage winding and the second high-voltage winding is reduced from 35mm to 30mm, and the phase separation plate 8 in the existing structure is eliminated. And a 1mm small angle ring 40 and a 2mm outer pad 41 are additionally wrapped at the insulation weak position of the outer diameter side of the first layer cake 4 of each high-voltage winding, so that the electrical performance of the position is improved.
And 3mm outer pads 51 are added at the insulation weak positions of the second cake to the fourth cake on the outer diameter side of the head end of each high-voltage winding (namely 3mm outer pads 51 are added at the insulation weak positions of the middle layer cake 5 on the outer diameter side of each high-voltage winding), so that the insulation performance of the high-voltage winding is improved.
Through the comparison, the novel structure provided by the invention not only reduces the main insulation distance between phases of the high-voltage winding, but also cancels the phase partition plate, and simplifies the insulation structure at the position.
The invention also provides a method for optimizing the interphase main insulation structure of the high-voltage winding of the 110kV oil-immersed power transformer, and the main steps of the electromagnetic field optimization analysis are as follows:
1. establishing a calculation model of a solution area concerned by the transformer insulation structure;
2. the right material property of the matter medium is given according to the conducting wire and the insulating material used by the transformer;
3. specifying boundary conditions for solving the problem, such as high-voltage coil and low-voltage coil potentials;
4. setting a solving method, such as direct solving or iterative solving;
5. after all the settings are finished, executing solution calculation;
6. observing the calculation result, if the calculation result does not meet the design requirement, modifying the model, and recalculating; and a satisfactory optimized design scheme is obtained.
For a 110kV oil-immersed on-load voltage regulation power transformer, no matter the capacity of the transformer and the number of windings, the high-voltage winding interphase insulation structure provided by the invention is suitable as long as the high-voltage winding is arranged on the outermost side of each phase, and the insulation level of the high-voltage winding is full-wave impulse voltage 480kV and short-time power frequency voltage 200 kV.
Further, in the invention, an elliptic partial differential equation, namely a Laplace equation, is subjected to discretization, a mathematical model of the established 110kV oil-immersed on-load voltage regulation power transformer high-voltage winding interphase insulation structure is subjected to simulation calculation according to a finite element numerical simulation method, and the insulation structure of a concerned position is subjected to optimization analysis by combining the existing process production and manufacturing conditions and a criterion formed by long-term accumulated insulation test data.
In an oil-paper insulation system, by utilizing the oil volume effect principle of an oil-immersed transformer and adopting an insulation structure of a thin paper tube with a small oil gap, mathematical models of different main insulation distances and different oil gap divisions are established for simulation analysis. And adjusting the unreasonable insulation structure type and size according to the calculation results of the electric field intensity of different models, the power line distribution and the safety margin. And reasonably dividing the finally determined main insulating oil gap of 30mm by adopting an insulating paper tube, and evaluating the compressive strength of the first oil gap on the surface of the high-voltage winding by combining process production and manufacturing conditions and an insulating criterion. For the electrode structure with a large local electric field value, measures such as improving the shape of the electrode, wrapping a small angle ring insulating part and the like are taken to ensure that a high field intensity area has enough safety margin and the optimized insulating structure meets the requirement of safe and stable operation of equipment. The optimized simulation results are shown in fig. 3.
Aiming at the existing 110kV oil immersed type on-load voltage regulation power transformer internal high-voltage winding alternate main insulation structure in the industry, the scheme optimizes the simulation design, and provides a new insulation structure.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (5)
1. The utility model provides an alternate main insulation system of 110kV oil-immersed power transformer high-voltage winding, it includes first high-voltage winding and second high-voltage winding, is provided with the coil screen on every high-voltage winding, and every high-voltage winding includes first layer cake, well layer cake and last layer cake, its characterized in that: and the distance between the first layer cake and the middle layer cake of the first high-voltage winding and the first layer cake and the middle layer cake of the second high-voltage winding is greater than the distance between the last layer cake of the first high-voltage winding and the last layer cake of the second high-voltage winding.
2. The 110kV oil-immersed power transformer high-voltage winding interphase main insulation structure according to claim 1, characterized in that: the main insulation distance between the first high voltage winding and the second high voltage winding is 30 mm.
3. The 110kV oil-immersed power transformer high-voltage winding interphase main insulation structure according to claim 1, characterized in that: and the insulation weak position on the outer diameter side of the first layer cake is additionally coated with a 1mm small angle ring and a 2mm outer pad.
4. The 110kV oil-immersed power transformer high-voltage winding interphase main insulation structure according to claim 1, characterized in that: and 3mm of outer pads are added at the insulation weak positions on the outer diameter side of the middle-layer cake.
5. A method for optimizing a 110kV oil-immersed power transformer high-voltage winding interphase main insulation structure, which is characterized by comprising the following steps:
firstly, establishing a calculation model of a solving area related to an insulation structure of the transformer, setting a main insulation distance between a first high-voltage winding and a second high-voltage winding to be 30mm, and performing discretization processing by using a Laplace equation;
secondly, according to the material properties of a lead and an insulating material used by the transformer, a 1mm small angle ring and a 2mm outer pad are additionally wrapped at the insulation weak position of the outer diameter side of the first layer of cake, and a 3mm outer pad is additionally arranged at the insulation weak position of the outer diameter side of the middle layer of cake;
step three, appointing to solve boundary conditions, and setting the potentials of a high-voltage coil and a low-voltage coil;
and fourthly, in an oil-paper insulation system, by utilizing an oil volume effect principle of an oil-immersed transformer and adopting an insulation structure with a thin paper tube and a small oil gap, establishing mathematical models of different main insulation distances and different oil gap divisions according to the three steps to perform simulation analysis, and adjusting unreasonable insulation structure types and sizes according to calculation results of electric field intensity, power line distribution and safety margin of different models.
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| CN201911368374.8A CN110890203A (en) | 2019-12-26 | 2019-12-26 | 110kV oil-immersed power transformer high-voltage winding interphase main insulation structure and structure optimization method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116053013A (en) * | 2022-11-18 | 2023-05-02 | 上海交通大学 | General design method of large-scale transformer on-load tap-changer |
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- 2019-12-26 CN CN201911368374.8A patent/CN110890203A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116053013A (en) * | 2022-11-18 | 2023-05-02 | 上海交通大学 | General design method of large-scale transformer on-load tap-changer |
| CN116053013B (en) * | 2022-11-18 | 2024-03-08 | 上海交通大学 | General design method of large-scale transformer on-load tap-changer |
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