EP3014712A1 - Device for diverting earth currents, more particularly in wind turbines - Google Patents
Device for diverting earth currents, more particularly in wind turbinesInfo
- Publication number
- EP3014712A1 EP3014712A1 EP14734107.7A EP14734107A EP3014712A1 EP 3014712 A1 EP3014712 A1 EP 3014712A1 EP 14734107 A EP14734107 A EP 14734107A EP 3014712 A1 EP3014712 A1 EP 3014712A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- carbon brush
- metal
- sliding contact
- silver
- currents
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
- H01R39/26—Solid sliding contacts, e.g. carbon brush
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
- H01R39/20—Contacts for co-operation with commutator or slip-ring, e.g. contact brush characterised by the material thereof
Definitions
- the invention relates to a device for discharging grounding currents, in particular in wind power plants, of electrical machines, having a grounding ring arranged on a rotor of the electric machine and connected to ground
- Inverter clock frequency in the range of 2 to 3 kHz.
- the inverter In rotor-fed asynchronous generators, the inverter is located directly on the rotor via slip rings.
- a so-called wave grounding is known.
- a grounding ring is arranged on the shaft, which is in contact with a sliding contact element, which is connected to ground.
- the sliding contact element is known to be formed by a metal graphite brush or metal graphite natural graphite layer brush. It has been found that with the use of the metal-graphite brushes or metal-graphite natural graphite layer brushes, a relatively rapid wear on the apparatus for discharging ground currents occurs. Here it comes regularly to stains on the
- the invention is therefore based on the object, a device for the derivation of
- grounding currents of the generic type which is characterized by a simple structure and is low-wear and ensures safe dissipation of high-frequency currents.
- the sliding contact element has a carbon brush with a bulk density of 1, 1 to 1, 4 g / cm 3 , and the carbon brush has a metal deposit of silver, wherein the silver content is between 1 and 8%.
- the carbon ensures a good electrical and mechanical contact of the sliding contact element with the earthing ring with metal insertion and has a high cross-resistance with very constant coefficients of friction over the entire load spectrum.
- the friction coefficient is for example in the range between 0.15 to 0.20. The friction coefficient remains constant under different operating and environmental conditions.
- a wear of the earthing ring that is, the contact path coming into contact with the sliding contact, is reduced to an absolute minimum.
- Metal incorporation with the bulk density according to the invention also has the advantages described above.
- inventively found combination of a graphite with low density and constant, high coefficient of friction with low silver content in the structure is achieved that the elasticity and the coefficient of friction of the graphite material is maintained, the small amount of silver affects the density only slightly but at the same time a significant
- Carbon brush with metal insertion between 1, 15 to 1, 30 g / cm 3 , in particular between 1, 2 to 1, 28 g / cm 3 . It has been found that a very constant coefficient of friction with the mentioned advantages can be realized with this density.
- a carbon brush with metal inclusion with the features mentioned in claim 7.
- FIG. 1 shows a device, generally designated 10, for diverting earth currents.
- the device 10 includes a grounding ring 12 disposed on a shaft 14.
- the shaft 14 is part of a rotor of an electrical machine, in particular a rotor-feeding asynchronous generator for wind turbines. Structure and mode of action of Runner-feeding asynchronous generators are well known, so that will not be discussed further in the context of the present description.
- the grounding ring 12 is associated with a sliding contact element 16, which includes a carbon brush with metal insert 18.
- the carbon brush with metal insert 18 is connected via a line 20 shown here to ground potential.
- the carbon brush with metal insert 18 is in contact with the ground ring 12.
- Such an arrangement is known per se.
- the carbon brush with metal inclusion 18 has a bulk density of 1, 2 to 1, 28 g / cm 3 . Furthermore, the metal graphite brush 18 has a silver impregnation between 2.5 and 5% silver content.
- Friction coefficient also a small voltage drop, that is a lower
- Transition resistance between the carbon brush with metal insert 18 and the grounding ring 12 achieved.
- a silver solution is injected into the carbon brush with metal deposit 18 of low bulk density, and then the silver is precipitated by a chemical-thermal process. The silver is not melted for this purpose.
- the silver content plays only a minor role for the current conductivity of the carbon brush with metal inclusion 18.
- a 5% silver content in the metal graphite brush 18 causes the voltage drop across the device 10 to drop by 50% and 2.5%
- Silver content causes the voltage drop in device 10 to drop by 25% relative to a non-silver impregnated carbon brush with metal deposition
- the silver impregnation thus leads, in addition to the low bulk density of the carbon brush with metal insertion 18 already provided according to the invention, to further advantages.
- a high pulse current resistance is achieved. At idling, this is for example 0 A / cm 2 , and at load 20 A / cm 2 . Due to the low density has the
- Carbon brush with metal inclusion 18 high elasticity, which leads to a constant coefficient of friction. Achievable is the low density, for example, by a low ash content, for example, 0.8% in the carbon brush used with metal insertion.
- the high-elastic brush material for the carbon brush with metal insert 18 with low density a stable coefficient of friction in combination with the low silver content in the brush material and a lower
Landscapes
- Motor Or Generator Current Collectors (AREA)
- Motor Or Generator Frames (AREA)
- Wind Motors (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013212062.1A DE102013212062B4 (en) | 2013-06-25 | 2013-06-25 | Device for discharging grounding currents, in particular in wind power plants |
PCT/EP2014/063414 WO2014207047A1 (en) | 2013-06-25 | 2014-06-25 | Device for diverting earth currents, more particularly in wind turbines |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3014712A1 true EP3014712A1 (en) | 2016-05-04 |
EP3014712B1 EP3014712B1 (en) | 2019-02-27 |
Family
ID=51033198
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14734107.7A Active EP3014712B1 (en) | 2013-06-25 | 2014-06-25 | Device for diverting earth currents, more particularly in wind turbines |
Country Status (7)
Country | Link |
---|---|
US (1) | US10109969B2 (en) |
EP (1) | EP3014712B1 (en) |
JP (1) | JP2016525329A (en) |
CN (1) | CN105340139B (en) |
DE (1) | DE102013212062B4 (en) |
EA (1) | EA030914B1 (en) |
WO (1) | WO2014207047A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6544808B2 (en) * | 2013-07-10 | 2019-07-17 | ジーイー・ヘルスケア・バイオプロセス・アールアンドディ・アクチボラグ | Mutant immunoglobulin binding polypeptide |
DK3255276T3 (en) * | 2016-06-09 | 2019-05-13 | Siemens Gamesa Renewable Energy As | Lightning protection system for a wind turbine |
DE102016213653A1 (en) | 2016-07-26 | 2018-02-01 | Schunk Hoffmann Carbon Technology Ag | Discharge device for dissipation of electrical interference |
JP7250337B2 (en) | 2019-11-25 | 2023-04-03 | トライス株式会社 | METAL-GRAPHITIC EARTH BRUSH MAINLY COMPOUNDED BY SILVER AND METHOD FOR MANUFACTURING THE SAME |
DE102022205412A1 (en) * | 2022-05-30 | 2023-11-30 | Trelleborg Sealing Solutions Germany Gmbh | Shaft current arrester and shaft arrangement |
CN116717439B (en) * | 2023-08-11 | 2023-11-17 | 威海亨策新能源科技有限公司 | Wind generating set with lightning protection device |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2640944A (en) * | 1949-06-04 | 1953-06-02 | Union Carbide & Carbon Corp | Electrical contact brush |
GB804688A (en) * | 1957-05-09 | 1958-11-19 | Nobrac Carbon Ltd | Improvements in or relating to dynamo electric machines |
US2989490A (en) * | 1958-02-19 | 1961-06-20 | Union Carbide Corp | Electrical contact brush for high altitude use |
US3284371A (en) * | 1964-01-14 | 1966-11-08 | Stackpole Carbon Co | Electrographitic brush |
DE3650282T2 (en) * | 1985-08-27 | 1995-11-09 | Intercal Co | Electrical contact with graphite containing deposits. |
DE4403433A1 (en) * | 1994-02-04 | 1995-08-10 | Schunk Kohlenstofftechnik Gmbh | Metal-impregnated carbon material |
US5634800A (en) * | 1994-04-29 | 1997-06-03 | The B. F. Goodrich Company | Sliding contact for a propeller ice protection system |
KR101011999B1 (en) | 2003-09-04 | 2011-01-31 | 도탄카코 가부시키가이샤 | Carbon brush for electrical machine |
JP4091024B2 (en) * | 2004-07-26 | 2008-05-28 | 東炭化工株式会社 | Carbon brush |
WO2007073793A1 (en) * | 2005-12-24 | 2007-07-05 | Pyongyang Technical Trading Centre | Flexible natural graphite material and flexible manufacturing method (process) and use thereof |
JP5825705B2 (en) * | 2010-03-26 | 2015-12-02 | 東洋炭素株式会社 | Carbon brush |
DE102010039065B4 (en) * | 2010-08-09 | 2012-08-02 | Siemens Aktiengesellschaft | Grounding device for grounding a shaft |
CN102806511A (en) * | 2011-05-31 | 2012-12-05 | 江国军 | Precision grinding machine |
CN202710201U (en) * | 2012-08-19 | 2013-01-30 | 中国船舶重工集团公司第七一二研究所 | Device for detecting temperature of permanent magnet of permanent-magnetic motor online |
JP6539018B2 (en) * | 2014-04-23 | 2019-07-03 | 東炭化工株式会社 | Resin-bonded carbonaceous brush and method for producing the same |
-
2013
- 2013-06-25 DE DE102013212062.1A patent/DE102013212062B4/en not_active Expired - Fee Related
-
2014
- 2014-06-25 EP EP14734107.7A patent/EP3014712B1/en active Active
- 2014-06-25 EA EA201501138A patent/EA030914B1/en not_active IP Right Cessation
- 2014-06-25 CN CN201480036791.1A patent/CN105340139B/en active Active
- 2014-06-25 JP JP2016522470A patent/JP2016525329A/en active Pending
- 2014-06-25 US US14/897,902 patent/US10109969B2/en not_active Expired - Fee Related
- 2014-06-25 WO PCT/EP2014/063414 patent/WO2014207047A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2014207047A1 * |
Also Published As
Publication number | Publication date |
---|---|
EA030914B1 (en) | 2018-10-31 |
US10109969B2 (en) | 2018-10-23 |
JP2016525329A (en) | 2016-08-22 |
DE102013212062B4 (en) | 2017-05-11 |
US20160134072A1 (en) | 2016-05-12 |
CN105340139B (en) | 2019-06-07 |
EA201501138A1 (en) | 2016-05-31 |
DE102013212062A1 (en) | 2015-01-08 |
EP3014712B1 (en) | 2019-02-27 |
WO2014207047A1 (en) | 2014-12-31 |
CN105340139A (en) | 2016-02-17 |
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