CN103839657A - Neutral point and shell dual ground system for transformers - Google Patents
Neutral point and shell dual ground system for transformers Download PDFInfo
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- CN103839657A CN103839657A CN201410091004.5A CN201410091004A CN103839657A CN 103839657 A CN103839657 A CN 103839657A CN 201410091004 A CN201410091004 A CN 201410091004A CN 103839657 A CN103839657 A CN 103839657A
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Abstract
The invention relates to a neutral point and shell dual ground system for transformers and solves the defect that proneness of transformer ground contacts to corrosion or breaking causes major sources of hidden dangers as compared with the prior art. The system comprises a transformer, ground flat bars, and a current transformer; the ground flat bars are fixedly and vertically mounted on a ground device; a neutral point of the transformer is connected with the current transformer; the current transformer is connected with copper connecting terminals B of the ground flat bars through neutral point ground wires; shell ground contacts of the transformer are connected with copper connecting terminals A of the ground flat bars through transformer shell ground wires; the copper connecting terminals A are 60mm away from the copper connecting terminals B; the copper connecting terminals A are connected with the copper connecting terminals B through cotton covered wires which are BVR35 in specification. The neutral point and shell dual ground system for transformers has the advantages that effective grounding can be maintained even after one ground terminal is corroded and broken.
Description
Technical field
The present invention 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, ensures 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 it seems from practical application, 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.
Summary of the invention
The object of the invention is easily occur corrosion or disconnect in order to solve transformer grounding point in prior art, thereby bring the defect of major safety risks, provide 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, technical scheme of the present invention 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, be connected by cotton covered wire, 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.
beneficial effect
The two grounding systems of a kind of neutral point for transformer of the present invention 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, ensure, 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; Lian Dihou respectively, 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.
brief description of the drawings
Fig. 1 is circuit theory diagrams of the present invention
Fig. 2 is structural representation of the present invention
Fig. 3 is the mounting structure figure of ground connection band iron of the present invention
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 invention and effect of reaching are had a better understanding and awareness, coordinate detailed explanation in order to preferred embodiment and accompanying drawing, be described as follows:
As depicted in figs. 1 and 2, the two grounding systems of a kind of neutral point for transformer of the present invention 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, can reach grounding function by ground connection band iron 8.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 ensure 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, be connected by cotton covered wire 11, 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, ensured 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 accesses 380V inlet wire 12 through fuse switch 1, transformer 2, current transformer 3, 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 multiple 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 when insulation breakdown, the Lightning Over-voltage of low voltage electric network is had to certain leakage ability.In the time of 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 ensure 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.Owing to being connected by cotton covered wire 11 between copper cash nose A81 and copper cash nose B82, it is equivalent to be connected in parallel, and total earth resistance is reduced greatly, thereby the pressure drop while thunderbolt 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 general principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what in above-described embodiment and specification, describe is principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in claimed scope of the present invention.The protection range that the present invention requires is defined by appending claims and equivalent thereof.
Claims (4)
1. the 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)) be connected by neutral ground line (10), the copper cash nose A(81 of the earthing of casing point of described transformer (2) and ground connection band iron (8)) be connected by transformer case earth connection (9), copper cash nose A(81) and copper cash nose B(82) at a distance of 60mm, copper cash nose A(81) and copper cash nose B(82) between be connected by cotton covered wire (11), 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: described copper cash nose A(81) be positioned at the 50mm place, upper end of 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 |
|---|---|---|---|
| CN201410091004.5A CN103839657B (en) | 2014-03-13 | 2014-03-13 | A kind of neutral point for transformer and the two grounding system of shell |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410091004.5A CN103839657B (en) | 2014-03-13 | 2014-03-13 | A kind of neutral point for transformer and the two grounding system of shell |
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| CN103839657A true CN103839657A (en) | 2014-06-04 |
| CN103839657B CN103839657B (en) | 2016-03-02 |
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| CN201410091004.5A Active CN103839657B (en) | 2014-03-13 | 2014-03-13 | A kind of neutral point for transformer and the two grounding system of shell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106384959A (en) * | 2016-09-08 | 2017-02-08 | 国网山东省电力公司经济技术研究院 | Dual-grounding device applied to transformer station guardrail |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6449984A (en) * | 1987-08-19 | 1989-02-27 | Hitachi Ltd | Partial discharge diagnosing device for transformer |
| JPH09223632A (en) * | 1996-02-19 | 1997-08-26 | Fuji Electric Co Ltd | Neutral-point current-limiting apparatus for transformer |
| US6696925B1 (en) * | 2002-02-15 | 2004-02-24 | Lynn-Edward Professional Services, Inc. | Electrical revenue meter and instrument transformers mobile station |
| CN201247916Y (en) * | 2008-06-19 | 2009-05-27 | 江苏省电力公司泰州供电公司 | Chamber type liaison transforming plant for reducing voltage from 20kV to 10kV |
| CN102214878A (en) * | 2010-04-07 | 2011-10-12 | 凡甲电子(苏州)有限公司 | Power supply connector and power supply connector combination |
| CN102254733A (en) * | 2011-07-25 | 2011-11-23 | 北京京东方真空电器有限责任公司 | Double-grounded three-station vacuum switch tube |
| CN203799779U (en) * | 2014-03-13 | 2014-08-27 | 国家电网公司 | Neutral point and shell double-grounding system for transformer |
-
2014
- 2014-03-13 CN CN201410091004.5A patent/CN103839657B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6449984A (en) * | 1987-08-19 | 1989-02-27 | Hitachi Ltd | Partial discharge diagnosing device for transformer |
| JPH09223632A (en) * | 1996-02-19 | 1997-08-26 | Fuji Electric Co Ltd | Neutral-point current-limiting apparatus for transformer |
| US6696925B1 (en) * | 2002-02-15 | 2004-02-24 | Lynn-Edward Professional Services, Inc. | Electrical revenue meter and instrument transformers mobile station |
| CN201247916Y (en) * | 2008-06-19 | 2009-05-27 | 江苏省电力公司泰州供电公司 | Chamber type liaison transforming plant for reducing voltage from 20kV to 10kV |
| CN102214878A (en) * | 2010-04-07 | 2011-10-12 | 凡甲电子(苏州)有限公司 | Power supply connector and power supply connector combination |
| CN102254733A (en) * | 2011-07-25 | 2011-11-23 | 北京京东方真空电器有限责任公司 | Double-grounded three-station vacuum switch tube |
| CN203799779U (en) * | 2014-03-13 | 2014-08-27 | 国家电网公司 | Neutral point and shell double-grounding system for transformer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106384959A (en) * | 2016-09-08 | 2017-02-08 | 国网山东省电力公司经济技术研究院 | Dual-grounding device applied to transformer station guardrail |
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| CN103839657B (en) | 2016-03-02 |
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