CN218918625U - Novel voltage transformer insulated by mixed medium - Google Patents
Novel voltage transformer insulated by mixed medium Download PDFInfo
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- CN218918625U CN218918625U CN202223593586.6U CN202223593586U CN218918625U CN 218918625 U CN218918625 U CN 218918625U CN 202223593586 U CN202223593586 U CN 202223593586U CN 218918625 U CN218918625 U CN 218918625U
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Abstract
The utility model discloses a novel voltage transformer insulated by using a mixed medium, which comprises a voltage transformer body at the lower part and a high-voltage outlet part at the upper part, wherein the lower part and the upper part can be detachably installed, the voltage transformer body comprises an iron core, a coil wound on the iron core and an epoxy resin casting body used for insulating and wrapping the iron core and the coil, the high-voltage outlet part comprises a central conductor, a sleeve and an inflation valve, the central conductor is sleeved with the sleeve, the inflation valve is installed on the sleeve, SF6 gas is inflated in the sleeve, and the central conductor is communicated with the coil. Through the mode, the epoxy resin is used for casting and insulating the area with larger local discharge risk, the area with frequent change of the size and the area with easy damage are changed into the gas insulation sleeve which is easy to replace, the single-medium insulation product is changed into the mixed insulation mode of the epoxy resin and the gas, and the split type design is convenient to replace and maintain.
Description
Technical Field
The utility model relates to the technical field of high-voltage electricity, in particular to a novel voltage transformer insulated by using a mixed medium.
Background
The voltage transformer with the voltage level of 72.5kV and below applied to the electrical field is mainly insulated by epoxy resin, but the epoxy resin insulated products still have various difficult problems in manufacturing and practical application, such as low qualification rate of products, especially products with the voltage level of 72.5kV, the qualification rate of partial discharge detection is always low, the current transformer is shown in figure 1, the umbrella skirt at the lower part and the upper part is integrally cast and formed by epoxy resin, the special mould is required for casting the epoxy resin, the external insulation creepage distance of the transformer required by different altitude areas is inconsistent, namely, the heights of the umbrella skirt are different, different requirements are all realized by different moulds, the mould investment cost is high, the mould investment is required to be changed to realize, the problem of great cost pressure is brought to manufacturers, the umbrella skirt at the upper part of the transformer is formed by casting resin, the material characteristics are relatively fragile, transportation and field installation are easy to collide and damage, repair is difficult after that the transformer skirt is damaged, and the long-distance transformer substation is greatly damaged due to the bad in field construction environment, and the long-distance transformer substation is greatly repaired.
In addition, since the electric field breakdown resistance of the epoxy resin is not strong enough, the use of epoxy resin insulation is easy to generate discharge.
Based on the defects and shortcomings, the prior art needs to be improved, and a novel voltage transformer insulated by using a mixed medium is designed.
Disclosure of Invention
The utility model mainly solves the technical problem of providing a novel voltage transformer insulated by using a mixed medium, wherein the region with larger local discharge risk is cast and insulated by using epoxy resin, the region with frequent change of size and easy damage is changed into a gas insulation sleeve which is easy to replace, and compared with the traditional voltage transformer insulated by a single medium, the novel voltage transformer insulated by using the mixed medium is a novel voltage transformer insulated by using the mixed medium.
In order to solve the technical problems, the utility model adopts a technical scheme that: the utility model provides an use novel voltage transformer of mixed medium insulation, this kind of use novel voltage transformer of mixed medium insulation adopts upper and lower split type structure, the high voltage wire outgoing part of voltage transformer body and upper portion including the lower part, lower part and upper portion demountable installation, the voltage transformer body includes the iron core, around establishing the coil on the iron core and with the insulating epoxy resin casting body that is used for of iron core and coil parcel, the high voltage wire outgoing part includes center conductor, sleeve pipe and inflation valve, the cover has the sleeve pipe on the center conductor, installs the inflation valve on the sleeve pipe, the inside SF6 gas that fills of sleeve pipe, center conductor and coil switch-on.
Preferably, the sleeve is a porcelain sleeve or a silicone rubber composite sleeve.
Preferably, the sleeve is fixed with a sleeve bolt of the voltage transformer body, and the sealing surface seals gas by using an O-shaped ring.
Compared with the prior art, the utility model has the beneficial effects that:
the high-voltage lead part with the umbrella skirt of the existing product is changed into a sleeve structure, the upper half part with the size which is frequently changed is changed into a porcelain sleeve or a silicon rubber composite sleeve, and meanwhile, the sleeve is easy to replace, so that the damaged sleeve is also easy to repair;
SF6 gas is filled in the sleeve, a central conductor and an inflation valve are arranged, and the area with larger control difficulty of partial discharge of the original transformer is changed into gas insulation;
the sleeve and the transformer body are fixed through bolts, the original transformer structure is divided into an upper part and a lower part, and the upper part (high-voltage outlet part) is not cast by epoxy resin;
the large-area popularization can greatly reduce the investment of fixed assets such as molds of manufacturers, improve the product qualification rate and greatly improve the maintainability of the product.
Drawings
Fig. 1 is a schematic diagram of the structure of an original voltage transformer.
Fig. 2 is a schematic diagram of a novel voltage transformer using mixed dielectric insulation.
Fig. 3 is a schematic diagram of the upper part structure of a novel voltage transformer using mixed dielectric insulation.
Wherein, 1, iron core, 2, coil, 3, epoxy resin casting body, 4, center conductor, 5, sleeve pipe, 6, inflation valve, 7, SF6 gas, 8, O type circle.
Detailed Description
The preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present utility model.
Referring to fig. 1 to 3, an embodiment of the present utility model includes:
the utility model provides an use novel voltage transformer of mixed medium insulation, this kind of use novel voltage transformer of mixed medium insulation adopts upper and lower split type structure, the high voltage outgoing line portion of voltage transformer body and upper portion including the lower part, lower part and upper portion demountable installation, the voltage transformer body includes iron core 1, around establishing coil 2 on iron core 1 and with the epoxy resin casting body 3 that is used for insulation of iron core 1 and coil 2 parcel, high voltage outgoing line portion includes center conductor 4, sleeve pipe 5 and inflation valve 6, the cover has sleeve pipe 5 on the center conductor 4, installs inflation valve 6 on the sleeve pipe 5, and sleeve pipe 5 inside fills SF6 gas 7, center conductor 4 and coil 2 switch-on, and the connection region of upper portion and lower part namely the X region in fig. 1 and 2 is electric field distribution inhomogeneous region, and here electric field strength is great, because the electric field resistance ability is like SF6 gas, uses epoxy resin integrated into one piece insulation to produce the discharge easily, leads to the product partial discharge inequality, but can be enough to improve the high-level high-pressure high enough in the electrode field strength of sufficient arc in the electrode because of 6 is enough in the angle of the high enough high-pressure resistance of the electrode.
The sleeve 5 adopts a porcelain sleeve or a silicon rubber composite sleeve, and the situation that the umbrella skirt of the transformer is damaged sometimes occurs due to the severe construction environment of the transformer substation, and the scheme of the sleeve 5 is used, so that the problem sleeve can be replaced on site after the umbrella skirt of the sleeve is damaged, the maintenance is convenient, and the maintainability of the product is greatly improved.
The sleeve 5 is fixed with the sleeve bolt of the voltage transformer body, the sealing surface is sealed by using the O-shaped ring 8, and because the outdoor product is inevitably used in high altitude areas, the sleeve with different heights and different umbrella skirt sizes can be selected for installation according to the requirements, the requirements can be met, the die is not required to be modified, and the manufacturing cost can be greatly saved.
According to the novel voltage transformer insulated by the mixed medium, the epoxy resin is used for casting and insulating the area with larger local discharge risk, the area with frequent change of the size and easy damage is changed into the gas insulation sleeve which is easy to replace, the product insulated by the single medium is changed into the mixed insulation mode of the epoxy resin and the gas, and the split type design is convenient to replace and maintain.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.
Claims (3)
1. A novel voltage transformer insulated by a mixed medium, which is characterized in that: this kind of use insulating novel voltage transformer of mixed medium adopts upper and lower split type structure, the high-voltage outgoing line portion on voltage transformer body and upper portion including the lower part, lower part and upper portion can demountable installation, voltage transformer body includes the iron core, around establishing the coil on the iron core and with the insulating epoxy resin casting body that is used for of iron core and coil parcel, high-voltage outgoing line portion includes center conductor, sleeve pipe and inflation valve, the cover has the sleeve pipe on the center conductor, installs the inflation valve on the sleeve pipe, and the inside SF6 gas that fills of sleeve pipe, center conductor and coil switch-on.
2. A novel voltage transformer insulated using a mixed medium according to claim 1, wherein: the sleeve is a porcelain sleeve or a silicon rubber composite sleeve.
3. A novel voltage transformer insulated using a mixed medium according to claim 1, wherein: the sleeve is fixed with a sleeve bolt of the voltage transformer body, and the sealing surface is sealed by using O-shaped rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223593586.6U CN218918625U (en) | 2022-12-29 | 2022-12-29 | Novel voltage transformer insulated by mixed medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223593586.6U CN218918625U (en) | 2022-12-29 | 2022-12-29 | Novel voltage transformer insulated by mixed medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218918625U true CN218918625U (en) | 2023-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223593586.6U Active CN218918625U (en) | 2022-12-29 | 2022-12-29 | Novel voltage transformer insulated by mixed medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218918625U (en) |
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2022
- 2022-12-29 CN CN202223593586.6U patent/CN218918625U/en active Active
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