CN201256042Y - Insulation construction for zinc bloom resistor valve sheet in oil immersion type transformer - Google Patents
Insulation construction for zinc bloom resistor valve sheet in oil immersion type transformer Download PDFInfo
- Publication number
- CN201256042Y CN201256042Y CNU2008200297499U CN200820029749U CN201256042Y CN 201256042 Y CN201256042 Y CN 201256042Y CN U2008200297499 U CNU2008200297499 U CN U2008200297499U CN 200820029749 U CN200820029749 U CN 200820029749U CN 201256042 Y CN201256042 Y CN 201256042Y
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- zinc oxide
- insulation
- valve block
- stage
- valve
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Abstract
The utility model discloses an insulating structure of zinc oxide resistance valve plates in an oil-immersed transformer, which comprises zinc oxide resistors in multi-stage series connection, and each stage of zinc oxide resistors is composed of a plurality of ZnO non-linear resistance valve plates. The insulating structure of zinc oxide resistance valve plates is characterized in that the multi-stage zinc oxide resistors are positioned by vertical insulating screws, two ends of the insulating screws are respectively fixed on an upper insulating support and a lower insulating support, each stage of resistance valve plates is equipped with a lead-out wire, the lead-out wire is connected with tapping points corresponding to a to-be-protected transformer voltage-regulating winding and an on-load tap-changer, metal grading rings are respectively disposed between the resistance valve plates in each stage and at two ends of a valve plate system, and an insulating folding screen is disposed on the periphery of the zinc oxide valve plate system. The insulating structure of zinc oxide resistance valve plates overcomes the shortage of the outdated insulating structure of zinc oxide resistance valve plates, realizes inter-stage and full-range protection on the transformer voltage-regulating winding and the on-load tap-changer.
Description
Technical field
The utility model relates to a kind of insulation system that is used for high voltage oil immersion formula transformer zinc oxide (ZnO) nonlinear resistor valve sheet.
Background technology
Zinc oxide valve plate belongs to semiconductor, and its resistance is non-linear voltage-current characteristic, and valve block under the effect of certain voltage conducting can take place, and discharges the high voltage that is added on the valve block, only keeps lower residual voltage on the valve block.Because ZnO resistors has such characteristic, therefore at the inner znr that rationally uses of the high voltage oil immersion formula transformer of some special constructions, can limit the overvoltage that is attached thereto (as on load tap changer, pressure regulation winding etc.) on the element that connects effectively, improve the insulating reliability of transformer, make the insulation system of transformer simple relatively.Fig. 1 is a kind of high voltage oil immersion formula transformer connection schematic diagram of special construction, this transformer inserts znr on load tap changer and pressure regulation winding, the current potential of zinc oxide valve plate (when moving with the test) current potential with on load tap changer and pressure regulation winding in some cases is identical.
Power transformer product is the disk shape with the ZnO resistors valve block, be installed in fuel tank internal and be immersed in the transformer oil, there is metal coating on its two surface, mutually several ZnO resistors valve blocks of being stacked together of series connection can conducting under the effect of certain voltage difference, as required the ZnO resistors system is divided into the n level, every grade of valve block by right quantity is formed.
ZnO resistors valve block insulation system mainly is in the oil-filled transformer in the past: valve block adopts insulating effect not obvious but can passive laminated phenolic paper pipe outward; valve block is installed in the paper tube; metal spring by the end compresses; system's lead-out wire is drawn respectively from both ends; be connected with claimed transformer pressure regulation winding and on load tap changer, concrete structure is referring to Fig. 2.The existing shortcoming of this structure is: when system's current potential is higher; electrical insulation properties can't guarantee; electrode shape as the valve block of electrified body can't improve effectively; the insulation oil clearance of valve block periphery can't rationally be cut apart; electrode surface can't cover insulation, and lead-out wire is only drawn from the system two ends, can only protect the gamut of transformer pressure regulation winding and on load tap changer; can't realize the inter-stage protection, careful inadequately.
Summary of the invention
The purpose of this utility model provides a kind of insulation system that is used for oil-filled transformer ZnO resistors valve block that overcomes old structural disadvantages, all can realize protection to the inter-stage of transformer pressure regulation winding and on load tap changer and gamut.
For reaching above purpose, the utility model takes following technical scheme to be achieved:
A kind of insulation system that is used for oil-filled transformer ZnO resistors valve block, the ZnO resistors device that comprises plural serial stage, every grade of ZnO resistors device is composed in series by several ZnO nonlinear resistor valve sheets, it is characterized in that, the multilevel zinc oxide resistor is located by vertical insulation blanket stud, and the insulation blanket stud two ends are separately fixed on the lower insulation support; Every grade of resistor valve sheet is provided with a lead-out wire, is connected with claimed transformer pressure regulation winding and the corresponding tapping point of on load tap changer; Between every grade of resistor valve sheet and valve block system two ends are provided with a metal grading ring, are provided with the insulation screen in the zinc oxide valve plate system peripherals.
In the such scheme, the metal grading ring that described valve block system two ends are provided with is the grading ring of surface coverage insulation.Described vertical insulation blanket stud is three insulation blanket studs that radially are Chinese character pin-shaped layout in the valve block system.
The utility model has the advantages that: can a plurality of grading rings be set according to the requirement of system's current potential, electric field, and when needed, being insulated in naked grading ring surface is covered as non-naked grading ring, to improve its electric strength; At the insulation screen of zinc oxide valve plate arranged outside, convenient and easy to the separation of the big oil clearance of valve block periphery; Simultaneously, because this screen does not support with (valve block supports the location by insulation blanket stud) as valve block, its shape can be provided with according to electric requirement fully, and is simple for production.System valve sheet sum of series lead-out wire quantity can be provided with as required, all can realize protection to the inter-stage of transformer pressure regulation winding and on load tap changer and gamut.
Description of drawings
Fig. 1 is a kind of high voltage oil immersion formula transformer connection schematic diagram of special construction.
Fig. 2 is a kind of old-fashioned oil-filled transformer internal oxidation zinc resistor valve sheet insulation system.
Fig. 3 is the improved new construction of the utility model.Among the figure: 1-metal spring, 2-lead-out wire, the grading ring of 3-surface coverage insulation, 4-insulating support, 5-insulation screen, 6-zinc oxide (ZnO) resistor valve sheet, 7-metal grading ring, 8-insulating support, 9-insulation blanket stud, 10-insulation nut.
Embodiment
Novel oil-filled transformer is inner sees Fig. 3 with the non-linear resistance improvement system schematic of zinc oxide (ZnO).
Novel insulation system after the improvement, in order to reduce the partial discharge quantity of system, adopt insulation blanket stud 9 and metal grading ring 7 structure that matches, all valve blocks 6, metal grading ring 7 and lead-out wire 2, insulation blanket stud 9 location by three Chinese character pin-shaped placements, the insulation blanket stud two ends of whole valve block system are fixed on the insulating support 4,8.For guarantee between the valve block 6, between valve block and the metal grading ring and reliable contact the between valve block and the lead-out wire, two ends compress with metal spring 1 and insulation nut.6 of every grade of valve blocks and valve block system two ends are provided with a metal grading ring 7, and wherein, as required, the metal grading ring that valve block system two ends are provided with can be the grading ring 3 of surface coverage insulation, to improve its electric strength.Every grade is provided with a lead-out wire, can link to each other respectively with claimed pressure regulation winding and the corresponding tapping point of on load tap changer.Simultaneously,, the screen of being made by insulating board system and cross-over block 5 is set, the big oil clearance of valve block periphery is suitably separated, improve its electric strength in the zinc oxide valve plate outside.
Claims (3)
1, a kind of insulation system that is used for oil-filled transformer ZnO resistors valve block, the ZnO resistors device that comprises plural serial stage, every grade of ZnO resistors device is composed in series by several ZnO nonlinear resistor valve sheets, it is characterized in that, the multilevel zinc oxide resistor is located by vertical insulation blanket stud, and the insulation blanket stud two ends are separately fixed on the lower insulation support; Every grade of resistor valve sheet is provided with a lead-out wire, is connected with claimed transformer pressure regulation winding and the corresponding tapping point of on load tap changer; Between every grade of resistor valve sheet and valve block system two ends are provided with a metal grading ring, are provided with the insulation screen in the zinc oxide valve plate system peripherals.
According to the described insulation system that is used for oil-filled transformer ZnO resistors valve block of claim 1, it is characterized in that 2, the metal grading ring that described valve block system two ends are provided with is the grading ring of surface coverage insulation.
According to the described insulation system that is used for oil-filled transformer ZnO resistors valve block of claim 1, it is characterized in that 3, described vertical insulation blanket stud is three insulation blanket studs that radially are Chinese character pin-shaped layout in the valve block system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200297499U CN201256042Y (en) | 2008-07-25 | 2008-07-25 | Insulation construction for zinc bloom resistor valve sheet in oil immersion type transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200297499U CN201256042Y (en) | 2008-07-25 | 2008-07-25 | Insulation construction for zinc bloom resistor valve sheet in oil immersion type transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201256042Y true CN201256042Y (en) | 2009-06-10 |
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ID=40739368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200297499U Expired - Lifetime CN201256042Y (en) | 2008-07-25 | 2008-07-25 | Insulation construction for zinc bloom resistor valve sheet in oil immersion type transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201256042Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103871721A (en) * | 2012-12-12 | 2014-06-18 | 国家电网公司 | On-load voltage regulating transformer allowing effective prevention of lightning impulses |
| CN108878123A (en) * | 2018-06-01 | 2018-11-23 | 中国电力科学研究院有限公司 | The distribution transformer of built-in arrester |
| CN109786056A (en) * | 2018-12-14 | 2019-05-21 | 西安交通大学 | A kind of low inductance large capacity adjustable resistor unit and device |
| CN112345898A (en) * | 2020-11-19 | 2021-02-09 | 西安西电变压器有限责任公司 | Breakdown process self-triggering observation system containing bubble insulating oil |
-
2008
- 2008-07-25 CN CNU2008200297499U patent/CN201256042Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103871721A (en) * | 2012-12-12 | 2014-06-18 | 国家电网公司 | On-load voltage regulating transformer allowing effective prevention of lightning impulses |
| CN108878123A (en) * | 2018-06-01 | 2018-11-23 | 中国电力科学研究院有限公司 | The distribution transformer of built-in arrester |
| CN108878123B (en) * | 2018-06-01 | 2021-07-06 | 中国电力科学研究院有限公司 | Distribution transformer with built-in lightning arrester |
| CN109786056A (en) * | 2018-12-14 | 2019-05-21 | 西安交通大学 | A kind of low inductance large capacity adjustable resistor unit and device |
| CN112345898A (en) * | 2020-11-19 | 2021-02-09 | 西安西电变压器有限责任公司 | Breakdown process self-triggering observation system containing bubble insulating oil |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090610 |
|
| CX01 | Expiry of patent term |