CN102623151A - Stable compressed structure for reducing partial electrical discharge of dry type transformer - Google Patents
Stable compressed structure for reducing partial electrical discharge of dry type transformer Download PDFInfo
- Publication number
- CN102623151A CN102623151A CN2011100317126A CN201110031712A CN102623151A CN 102623151 A CN102623151 A CN 102623151A CN 2011100317126 A CN2011100317126 A CN 2011100317126A CN 201110031712 A CN201110031712 A CN 201110031712A CN 102623151 A CN102623151 A CN 102623151A
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- winding
- type transformer
- metal crimp
- metal
- nail
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Abstract
The invention discloses a stable compressed structure for reducing partial electrical discharge of a dry type transformer. One end of an epoxy resin insulating block which butts against a metal press nail, is provided with a concave part the radial dimension of which is gradually enlarged from the bottom to the opening, and is also provided with a metal shielding cap embedded in the concave part surface. The metal shielding cap tightly butts against the grounded metal press nail to add all the field intensity on epoxy resin with better insulating performance, thus the aim of reducing partial discharge level is achieved. Moreover, the metal press nail is tightly pressed to the metal shielding cap by a head bulge matched with the concave part shape, so that the support height can be adjusted, the stress applied on a winding is uniform, and the short circuit resisting ability of a transformer winding is enhanced.
Description
Technical field
The present invention relates to reduce the stable compressing structure of dry-type transformer partial discharge
Background technology
The dry-type transformer end respectively has four winding compact heaps that support winding up and down; Existing dry-type transformer compact heap; Flat pin screw thread through being fixedly connected on head on the folder presses nail to be pressed on the end plane of epoxy resins insulation piece, between four epoxy resins insulation pieces and winding, the different silicane rubber plate of compression ratio is set in order to adjustment winding compact heap height respectively, is added in the winding compact heap like this and presses between nail the field intensity on the air gap relatively large; And press ailhead that field intensity is distorted more; Be prone to surpass allow field intensity to cause partial discharge to exceed standard, and can produce thrust to the winding compact heap during transformer sudden short circuit, the compression ratio that silicane rubber plate has nothing in common with each other causes thrust uneven; Supporting construction is unstable, and the winding anti-short circuit capability descends
Summary of the invention
the purpose of this invention is to provide the stable compressing structure that can reduce the dry-type transformer partial discharge.
are for achieving the above object; The present invention provides a kind of stable compressing structure that reduces the dry-type transformer partial discharge; Comprise the winding compact heap of winding, the said winding of support, the folder of fixing said winding compact heap; Said winding compact heap comprise an end push against said winding the other end have depression the epoxy resins insulation piece, be embedded in said sunk surface the metallic shield cap, be fixedly connected on the said folder metal crimp nail that pushes against the ground connection of said metallic shield cap with head; The radial dimension of said depression is enlarged to opening by the bottom gradually, and said metal crimp nail head is shaped as the convexity that is complementary with said concave shape.
preferably, said depression, said metal crimp nail head be shaped as the hemisphere that is complementary.
are because the technique scheme utilization; The present invention compared with prior art has advantage and effect: an end that pushes against at epoxy resins insulation piece and metal crimp nail is provided with the depression that radial dimension is enlarged to opening by the bottom gradually; Setting is embedded in the metallic shield cap on the sunk surface; The metal crimp nail that is fixed on the ground connection on the folder is pressed on the metallic shield cap with the head convexity that is complementary with concave shape, and the surface area that touches of epoxy resins insulation piece and metal crimp nail joint is bigger like this, masked former be added in epoxy resins insulation piece and metal crimp follow closely between field intensity on the air-gap; Field intensity is added on the better epoxy resin of insulation property equably; Reduced partial discharge, and the metal crimp of each nose shape and recessed fit nail can play the effect of regulating crush pad as the compressing structure of stablizing hold-down ring epoxy resins collets; Guarantee that winding is stressed evenly, improve the winding anti-short circuit capability.
Description of drawings:
accompanying drawing 1 is looked sketch map for master of the present invention.
Embodiment:
Referring to shown in Figure 1, partial discharge of transformer not only can produce high-speed ion the surperficial of insulating material directly destroyed, and also generation is prone to make the ozone of insulating material cracking, the easy generation nitric acid that combines with moisture that insulating material is corroded nitrogen oxide simultaneously; In Fig. 1, the winding compact heap that the present invention is used to support winding 1 comprises that an end pushes against the epoxy resins insulation piece 4 that winding 1 the other end has hemispherical depression, and the form on the hemispherical depression surface with cast is packed with copper metallic shield cap 2; The metal crimp that is fixed on the folder 3 is followed closely 5 ground connection; Metal crimp nail 5 has the hemispheric head with the hemispherical depression form fit of epoxy resins insulation piece 4, and metal crimp nail 5 is pressed on the hemispherical depression surface of epoxy resins insulation piece 4 through hemispherical nose, and the field intensity that is added on 5 air gaps of winding compact heap and metal crimp nail is evenly distributed on metal crimp nail 5 and 4 bigger contacts area of epoxy resins insulation piece; Metal crimp nail 5 through ground connection masks again; All like this field intensity all are added on the better epoxy resins insulation piece 4 of insulation property, reach the purpose that reduces local discharging level, and because contact area is bigger; Metal crimp nail 5 can play stable hold-down ring epoxy resins collets and regulate the effect of crush pad; After Transformer Winding 1 lifting, after the perpendicularity and concentricity of adjusting Transformer Winding 1, regulate once more with special-purpose torque spanner; Make to compress and reach best stress; When transformer bore sudden short circuit like this, the lead of winding 1 loaded current produced powerful electric power, through the rigid support of winding 1; Electric power directly is passed to the winding compact heap; Metal crimp nail 5 carries thrust, can guarantee that winding 1 is stressed even, improves the anti-short circuit capability of Transformer Winding 1
Claims (2)
1. stable compressing structure that reduces the dry-type transformer partial discharge; Comprise the winding compact heap of winding, the said winding of support, the folder of fixing said winding compact heap; It is characterized in that: said winding compact heap comprise an end push against said winding the other end have depression the epoxy resins insulation piece, be embedded in said sunk surface the metallic shield cap, be fixedly connected on the said folder metal crimp nail that pushes against the ground connection of said metallic shield cap with head; The radial dimension of said depression is enlarged to opening by the bottom gradually, and said metal crimp nail head is shaped as the convexity that is complementary with said concave shape.
2. the stable compressing structure of reduction dry-type transformer partial discharge according to claim 1 is characterized in that: said depression, said metal crimp nail head be shaped as the hemisphere that is complementary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100317126A CN102623151A (en) | 2011-01-30 | 2011-01-30 | Stable compressed structure for reducing partial electrical discharge of dry type transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100317126A CN102623151A (en) | 2011-01-30 | 2011-01-30 | Stable compressed structure for reducing partial electrical discharge of dry type transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102623151A true CN102623151A (en) | 2012-08-01 |
Family
ID=46563009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100317126A Pending CN102623151A (en) | 2011-01-30 | 2011-01-30 | Stable compressed structure for reducing partial electrical discharge of dry type transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102623151A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103227037A (en) * | 2013-04-12 | 2013-07-31 | 苏州腾冉电气设备有限公司 | Assembly structure for coil line bank of dry-type transformer |
| CN103227042A (en) * | 2013-04-12 | 2013-07-31 | 苏州腾冉电气设备有限公司 | Shielded wire grounding structure of impregnated dry-type transformer coil |
| CN114113924A (en) * | 2021-10-22 | 2022-03-01 | 西南交通大学 | Method for evaluating damage degree of short-circuit electrodynamic force to epoxy resin |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2777722Y (en) * | 2005-03-16 | 2006-05-03 | 许继集团有限公司 | Non-local discharge press block for air immersed transformer |
| CN201673792U (en) * | 2010-05-18 | 2010-12-15 | 益阳华翔变压器制造有限公司 | Positioning and compressing device for coil of dry-type transformer |
| CN201966044U (en) * | 2011-01-30 | 2011-09-07 | 张家港市沙洲特种变压器制造有限公司 | Stabilization and compression structure capable of reducing partial discharge of dry-type transformer |
-
2011
- 2011-01-30 CN CN2011100317126A patent/CN102623151A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2777722Y (en) * | 2005-03-16 | 2006-05-03 | 许继集团有限公司 | Non-local discharge press block for air immersed transformer |
| CN201673792U (en) * | 2010-05-18 | 2010-12-15 | 益阳华翔变压器制造有限公司 | Positioning and compressing device for coil of dry-type transformer |
| CN201966044U (en) * | 2011-01-30 | 2011-09-07 | 张家港市沙洲特种变压器制造有限公司 | Stabilization and compression structure capable of reducing partial discharge of dry-type transformer |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103227037A (en) * | 2013-04-12 | 2013-07-31 | 苏州腾冉电气设备有限公司 | Assembly structure for coil line bank of dry-type transformer |
| CN103227042A (en) * | 2013-04-12 | 2013-07-31 | 苏州腾冉电气设备有限公司 | Shielded wire grounding structure of impregnated dry-type transformer coil |
| CN103227042B (en) * | 2013-04-12 | 2017-12-22 | 苏州腾冉电气设备有限公司 | A kind of shielding line ground structure of impregnated dry-type transformer coil |
| CN114113924A (en) * | 2021-10-22 | 2022-03-01 | 西南交通大学 | Method for evaluating damage degree of short-circuit electrodynamic force to epoxy resin |
| CN114113924B (en) * | 2021-10-22 | 2022-07-19 | 西南交通大学 | Method for evaluating damage degree of short-circuit electrodynamic force to epoxy resin |
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Application publication date: 20120801 |