CN203799779U - Neutral point and shell double-grounding system for transformer - Google Patents
Neutral point and shell double-grounding system for transformer Download PDFInfo
- Publication number
- CN203799779U CN203799779U CN201420112365.9U CN201420112365U CN203799779U CN 203799779 U CN203799779 U CN 203799779U CN 201420112365 U CN201420112365 U CN 201420112365U CN 203799779 U CN203799779 U CN 203799779U
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- Prior art keywords
- transformer
- grounding
- neutral point
- shell
- copper cash
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Links
- 230000007935 neutral effect Effects 0.000 title claims abstract description 34
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 62
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052742 iron Inorganic materials 0.000 claims abstract description 29
- 229920000742 Cotton Polymers 0.000 claims abstract description 10
- 229910052802 copper Inorganic materials 0.000 claims description 27
- 239000010949 copper Substances 0.000 claims description 27
- 238000004804 winding Methods 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 240000000233 Melia azedarach Species 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a neutral point and shell double-grounding system for a transformer. Compared with the prior art, the neutral point and shell double-grounding system solves the problem that because grounding points of a transformer can be corroded or broken easily, serious potential safety hazards are caused. The neutral point and shell double-grounding system comprises the transformer, grounding strap iron and a current transformer. The grounding strap iron is fixedly and perpendicularly installed on a grounding device, the neutral point of the transformer is connected with the current transformer, the current transformer is connected with a copper wire terminal B of the grounding strap iron through a neutral point grounding wire, a shell grounding point of the transformer is connected with a copper wire terminal A of the grounding strap iron through a shell grounding wire of the transformer, the distance between the copper wire terminal A and the copper wire terminal B is 60 mm, the copper wire terminal A and the copper wire terminal B are connected through a cotton covered wire, and the specification of the cotton covered wire is BVR35. The neutral point and shell double-grounding system guarantees that after one grounding end is corroded and broken, effective grounding can still be kept.
Description
Technical field
The utility model relates to transformer technology field, is the two grounding systems of a kind of neutral point for transformer and shell specifically.
Background technology
China rural area is vast, and rural power grids circuit present position is comparatively complicated, in order to prevent thunder and lightning infringement to distribution transformer at thunderstorm season, guarantees distribution transformer safe and stable operation, and power supply enterprise all can implement lightning protection to transformer and connect measure.And current rural power distribution transformer lightning protection is generally divided into OP earthing mode and NP earthing mode.But from practical application, it seems, all there is certain deficiency in these two kinds of earthing modes.Particularly, in many thunders, the higher area of pollution level, earth point easily corrodes or occurs that external action disconnects, thereby makes the neutrally earth-free of transformer, brings great potential safety hazard.How to develop the grounding system for transformer that a kind of coefficient of safety is high, reliability is high and become the technical problem of being badly in need of solution.
Utility model content
The purpose of this utility model is easily occur corrosion or disconnect in order to solve transformer grounding point in prior art, thereby brings the defect of major safety risks, provides the two grounding systems of a kind of neutral point for transformer and shell to solve the problems referred to above.
To achieve these goals, the technical solution of the utility model is as follows:
The two grounding systems of a kind of neutral point for transformer and shell, comprise transformer, ground connection band iron summation current transformer, ground connection band iron fixed vertical is arranged on earthing device, the neutral point of described transformer is connected with current transformer, current transformer is connected by neutral ground line with the copper cash nose B of ground connection band iron, the earthing of casing point of described transformer is connected by transformer case earth connection with the copper cash nose A of ground connection band iron, copper cash nose A and copper cash nose B are at a distance of 60mm, between copper cash nose A and copper cash nose B, by cotton covered wire, be connected, the specification of cotton covered wire is BVR35.
Described neutral ground line and the specification of transformer case earth connection are BVR35.
Described copper cash nose A is positioned at the 50mm place, upper end of ground connection band iron.
Also comprise lightning arrester, described lightning arrester is connected with ground connection band iron.
The two grounding systems of a kind of neutral point for transformer of the present utility model and shell, compared with prior art can prevent after an earth point corrosion or external action disconnection, the potential safety hazard producing because transformer neutral point is earth-free, guaranteed, after place's earth terminal occurs that corrosion disconnects, can also continue the ground connection of remaining valid.By the earth connection of lightning arrester and the neutral point of low pressure winding ground connection respectively, the lightning current of the lightning arrester that can prevent from flowing through, the pressure drop on earth resistance is applied on the winding of transformer; Difference Lian Dihou, apparatus insulated born voltage is the residual voltage of lightning arrester, and the pressure drop of thunder-strike current on earth resistance can not be applied in the insulation in equipment.
accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model
Fig. 2 is structural representation of the present utility model
Fig. 3 is the mounting structure figure of the utility model ground connection band iron
Wherein, 1-fuse switch, 2-transformer, 3-current transformer, 4-lightning arrester, 5-10KV inlet wire, 6-earthing device, 7-JP cabinet, 8-ground connection band iron, 9-transformer case earth connection, 10-neutral ground line, 11-cotton covered wire, 12-380V inlet wire, 13-reactive power compensator, 14-metering device, 15-control switch, 16-leading-out terminal, 81-copper cash nose A, 82-copper cash nose B.
Embodiment
For making that architectural feature of the present utility model and the effect reached are had a better understanding and awareness, in order to preferred embodiment and accompanying drawing, coordinate detailed explanation, be described as follows:
As depicted in figs. 1 and 2, the two grounding systems of a kind of neutral point for transformer described in the utility model and shell, comprise transformer 2, ground connection band iron 8 summation current transformers 3.Ground connection band iron 8 fixed vertical are arranged on earthing device 6, by ground connection band iron 8, can reach grounding function.The neutral point of transformer 2 is connected with current transformer 3, as shown in Figure 3, current transformer 3 is connected by neutral ground line 10 with the copper cash nose B82 of ground connection band iron 8, and the neutral point of transformer 2 leads to after current transformer 3, then leads to ground connection band iron 8 from current transformer 3.As shown in Figure 2, in actual use, current transformer 3 is contained in JP cabinet 7, therefore also can lead to ground connection band iron 8 from JP cabinet 7, reaches the neutral point of transformer 2 by the effect of current transformer 3 ground connection.The earthing of casing point of transformer 2 is connected by transformer case earth connection 9 with the copper cash nose A81 of ground connection band iron 8, thereby by the shell of transformer 2 also ground connection on ground connection band iron 8.Copper cash nose A81 and copper cash nose B82 are all positioned on ground connection band iron 8, and in order to guarantee earthing effect, copper cash nose A81 and copper cash nose B82 are at a distance of 60mm.Between copper cash nose A81 and copper cash nose B82, by cotton covered wire 11, be connected, the specification of cotton covered wire 11 is BVR35.Make like this neutral point of transformer have current transformer and two ground paths of transformer case, guaranteed at place's earth terminal, after place's earth terminal occurs that corrosion disconnects, can also continue the ground connection of remaining valid.
As shown in Figure 1,10KV inlet wire 5 is through fuse switch 1, transformer 2, current transformer 3 access 380V inlet wires 12, between fuse switch 1 and transformer 2, be also connected to lightning arrester 4, on 380V inlet wire 12, be connected to respectively reactive power compensator 13 and a plurality of leading-out terminal 16, metering device 14 and control switch 15 are all housed on leading-out terminal 16.Two grounding systems of the neutral point of transformer 2 and shell, can suppress that high-voltage line and low-voltage line connect and distribution transforming high-low pressure winding between the overvoltage of low voltage electric network outlet during insulation breakdown, the Lightning Over-voltage of low voltage electric network is had to certain leakage ability.When single-phase earthing, earth current is larger, can make earth leakage protective device action message, excises in time fault, plays good safe effect.
In order to guarantee result of use, the specification of neutral ground line 10 and transformer case earth connection 9 can be BVR35, and copper cash nose A81 is positioned at the 50mm place, upper end of ground connection band iron 8.Can also comprise lightning arrester 4, lightning arrester 4 is connected with ground connection band iron 8.Due between copper cash nose A81 and copper cash nose B82, by cotton covered wire 11, be connected, it is equivalent to be connected in parallel, and total earth resistance is reduced greatly, thereby the pressure drop while being struck by lightning also can reduce greatly.Prevent from the flowing through lightning current of lightning arrester, the pressure drop on earth resistance is applied on the winding of transformer.By lightning arrester and the transformer case ground connection that links together, the voltage to earth on winding, the voltage of main insulation is restricted to residual voltage of arrester, and the pressure drop on earth resistance will make shell potential rise, and low pressure winding is caused to contrary flicker; For avoiding the generation of contrary flicker, the neutral point of transformer low voltage winding is also connected on transformer case, makes neutral point and shell remain equipotential.
More than show and described basic principle of the present utility model, principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what in above-described embodiment and specification, describe is principle of the present utility model; under the prerequisite that does not depart from the utility model spirit and scope, the utility model also has various changes and modifications, and these changes and improvements all fall in claimed scope of the present utility model.The protection range that the utility model requires is defined by appending claims and equivalent thereof.
Claims (4)
1. two grounding systems of the neutral point for transformer and shell, comprise transformer (2), ground connection band iron (8) summation current transformer (3), ground connection band iron (8) fixed vertical is arranged on earthing device (6), it is characterized in that: the neutral point of described transformer (2) is connected with current transformer (3), the copper cash nose B(82 of current transformer (3) and ground connection band iron (8)) by neutral ground line (10), be connected, the copper cash nose A(81 of the earthing of casing point of described transformer (2) and ground connection band iron (8)) by transformer case earth connection (9), be connected, copper cash nose A(81) with copper cash nose B(82) at a distance of 60mm, copper cash nose A(81) with copper cash nose B(82) between by cotton covered wire (11), be connected, the specification of cotton covered wire (11) is BVR35.
2. the two grounding systems of a kind of neutral point for transformer according to claim 1 and shell, is characterized in that: described neutral ground line (10) and the specification of transformer case earth connection (9) are BVR35.
3. the two grounding systems of a kind of neutral point for transformer according to claim 1 and shell, is characterized in that: the 50mm place, upper end that described copper cash nose A(81) is positioned at ground connection band iron (8).
4. the two grounding systems of a kind of neutral point for transformer according to claim 1 and shell, is characterized in that: also comprise lightning arrester (4), described lightning arrester (4) is connected with ground connection band iron (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420112365.9U CN203799779U (en) | 2014-03-13 | 2014-03-13 | Neutral point and shell double-grounding system for transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420112365.9U CN203799779U (en) | 2014-03-13 | 2014-03-13 | Neutral point and shell double-grounding system for transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203799779U true CN203799779U (en) | 2014-08-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420112365.9U Withdrawn - After Issue CN203799779U (en) | 2014-03-13 | 2014-03-13 | Neutral point and shell double-grounding system for transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203799779U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103839657A (en) * | 2014-03-13 | 2014-06-04 | 国家电网公司 | Neutral point and shell dual ground system for transformers |
-
2014
- 2014-03-13 CN CN201420112365.9U patent/CN203799779U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103839657A (en) * | 2014-03-13 | 2014-06-04 | 国家电网公司 | Neutral point and shell dual ground system for transformers |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140827 Effective date of abandoning: 20160302 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |