CN103839657B - A kind of neutral point for transformer and the two grounding system of shell - Google Patents

A kind of neutral point for transformer and the two grounding system of shell Download PDF

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Publication number
CN103839657B
CN103839657B CN201410091004.5A CN201410091004A CN103839657B CN 103839657 B CN103839657 B CN 103839657B CN 201410091004 A CN201410091004 A CN 201410091004A CN 103839657 B CN103839657 B CN 103839657B
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China
Prior art keywords
transformer
copper cash
ground connection
band iron
cash nose
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CN201410091004.5A
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CN103839657A (en
Inventor
罗新
李冬梅
龙益辉
韩志国
徐向阳
詹昭
李桂霞
田维斌
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State Grid Corp of China SGCC
Liuan Power Supply Co of State Grid Anhui Electric Power Co Ltd
Shucheng Power Supply Co of State Grid Anhui Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Liuan Power Supply Co of State Grid Anhui Electric Power Co Ltd
Shucheng Power Supply Co of State Grid Anhui Electric Power Co Ltd
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Priority to CN201410091004.5A priority Critical patent/CN103839657B/en
Publication of CN103839657A publication Critical patent/CN103839657A/en
Application granted granted Critical
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Abstract

The present invention relates to a kind of neutral point for transformer and the two grounding system of shell, compared with prior art solve transformer grounding point and easily occur corrosion or disconnect, thus bring the defect of major safety risks.The present invention includes 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 is at a distance of 60mm, be connected by cotton covered wire between copper cash nose A with copper cash nose B, the specification of cotton covered wire is BVR35.This invention ensures that after place's earth terminal occurs that corrosion disconnects, can also ground connection of remaining valid be continued.

Description

A kind of neutral point for transformer and the two grounding system of shell
Technical field
The present invention relates to transformer technology field, specifically a kind of neutral point for transformer and the two grounding system of shell.
Background technology
China rural area is vast, and rural power grids circuit present position is comparatively complicated, and in order to prevent thunder and lightning in the infringement of thunderstorm season to distribution transformer, ensure distribution transformer safe and stable operation, power supply enterprise all can implement lightning protection to transformer and connect measure.And current rural power distribution transformer lightning protection, be 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, pollution level district higher, earth point easily corrodes or occurs that external action disconnects, thus 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 being badly in need of solving.
Summary of the invention
The object of the invention is easily occur corrosion to solve transformer grounding point in prior art or disconnect, thus bring the defect of major safety risks, provide a kind of neutral point for transformer and the two grounding system of shell to solve the problems referred to above.
To achieve these goals, technical scheme of the present invention is as follows:
A kind of neutral point for transformer and the two grounding system of 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 is at a distance of 60mm, be connected by cotton covered wire between copper cash nose A with copper cash nose B, 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
A kind of neutral point for transformer of the present invention and the two grounding system of shell, compared with prior art can prevent after an earth point corrosion or external action disconnect, due to transformer neutral point earth-free and produce potential safety hazard, ensure that after place's earth terminal occurs that corrosion disconnects, can also ground connection of remaining valid be continued.By the earth connection of lightning arrester and the neutral point ground connection respectively of low pressure winding, can prevent the lightning current flowing through lightning arrester, 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.
Accompanying drawing explanation
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 to have a better understanding and awareness architectural feature of the present invention and effect of reaching, coordinating detailed description in order to preferred embodiment and accompanying drawing, being described as follows:
As depicted in figs. 1 and 2, a kind of neutral point for transformer of the present invention and the two grounding system of 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, 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, the copper cash nose B82 of current transformer 3 and ground connection band iron 8 is connected by neutral ground line 10, after the neutral point of transformer 2 leads to 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 effect of neutral point by current transformer 3 ground connection of transformer 2.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, thus by the shell of transformer 2 also ground connection on ground connection band iron 8.Copper cash nose A81 and copper cash nose B82 is all positioned on ground connection band iron 8, and in order to ensure earthing effect, copper cash nose A81 and copper cash nose B82 is at a distance of 60mm.Be connected by cotton covered wire 11 between copper cash nose A81 with copper cash nose B82, the specification of cotton covered wire 11 is BVR35.Make the neutral point of transformer have current transformer and transformer case two ground paths like this, ensure that at place's earth terminal after place's earth terminal occurs that corrosion disconnects, can also ground connection of remaining valid be continued.
As shown in Figure 1,10KV inlet wire 5 accesses 380V inlet wire 12 through fuse switch 1, transformer 2, current transformer 3, lightning arrester 4 is also connected between fuse switch 1 and transformer 2,380V inlet wire 12 is connected to respectively reactive power compensator 13 and multiple leading-out terminal 16, leading-out terminal 16 is all equipped with metering device 14 and control switch 15.The neutral point of transformer 2 and two grounding systems of shell, can suppress high-voltage line and low-voltage line to connect and the overvoltage of low voltage electric network outlet during insulation breakdown between distribution transforming high-low pressure winding, have certain leakage ability to the Lightning Over-voltage of low voltage electric network.When single-phase earthing, earth current is comparatively large, can make earth leakage protective device action message, excise fault in time, play 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 with copper cash nose B82, it is equivalent to be connected in parallel, and total earth resistance is reduced greatly, thus pressure drop when being struck by lightning also can reduce greatly.Prevent the lightning current flowing through lightning arrester, the pressure drop on earth resistance is applied on the winding of transformer.To be linked together ground connection by lightning arrester and transformer case, the voltage to earth on winding, namely the voltage of main insulation is restricted to residual voltage of arrester, and the pressure drop on earth resistance will make shell current potential raise, and causes inverse flicker to low pressure winding; For avoiding the generation of inverse 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 describe 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; the just principle of the present invention described in above-described embodiment and specification; 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 of application claims is defined by appending claims and equivalent thereof.

Claims (4)

1. the neutral point for transformer and the two grounding system of 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 earthing of casing point of described transformer (2) and the copper cash nose A(81 of 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) with copper cash nose B(82) between be connected by cotton covered wire (11), the specification of cotton covered wire (11) is BVR35.
2. a kind of neutral point for transformer according to claim 1 and the two grounding system of 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 system 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. a kind of neutral point for transformer according to claim 1 and the two grounding system of shell, it is characterized in that: also comprise lightning arrester (4), described lightning arrester (4) is connected with ground connection band iron (8).
CN201410091004.5A 2014-03-13 2014-03-13 A kind of neutral point for transformer and the two grounding system of shell Active CN103839657B (en)

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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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CN103839657B true CN103839657B (en) 2016-03-02

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106384959B (en) * 2016-09-08 2018-04-17 国网山东省电力公司经济技术研究院 A kind of double earthing or grounding means applied to substation's guardrail

Family Cites Families (7)

* Cited by examiner, † Cited by third party
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
CN102214878B (en) * 2010-04-07 2013-06-05 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

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