EP3149812B1 - Method for reducing the resistance between two conductors - Google Patents
Method for reducing the resistance between two conductors Download PDFInfo
- Publication number
- EP3149812B1 EP3149812B1 EP15732472.4A EP15732472A EP3149812B1 EP 3149812 B1 EP3149812 B1 EP 3149812B1 EP 15732472 A EP15732472 A EP 15732472A EP 3149812 B1 EP3149812 B1 EP 3149812B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- contact interface
- conductors
- plane
- contact
- conductor
- 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.)
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Links
- 239000004020 conductor Substances 0.000 title claims description 65
- 238000000034 method Methods 0.000 title claims description 14
- 239000002245 particle Substances 0.000 claims description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 31
- 239000003921 oil Substances 0.000 claims description 31
- 239000000725 suspension Substances 0.000 claims description 29
- 229910002804 graphite Inorganic materials 0.000 claims description 17
- 239000010439 graphite Substances 0.000 claims description 17
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 238000005096 rolling process Methods 0.000 claims description 9
- 239000000314 lubricant Substances 0.000 claims description 5
- 239000010687 lubricating oil Substances 0.000 claims 1
- 239000002184 metal Substances 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000007788 liquid Substances 0.000 description 10
- 238000012546 transfer Methods 0.000 description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 9
- 229910052802 copper Inorganic materials 0.000 description 9
- 239000010949 copper Substances 0.000 description 9
- 239000012530 fluid Substances 0.000 description 5
- 230000000149 penetrating effect Effects 0.000 description 5
- 239000000835 fiber Substances 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 239000004519 grease Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- LLYXJBROWQDVMI-UHFFFAOYSA-N 2-chloro-4-nitrotoluene Chemical compound CC1=CC=C([N+]([O-])=O)C=C1Cl LLYXJBROWQDVMI-UHFFFAOYSA-N 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 230000005653 Brownian motion process Effects 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 238000005537 brownian motion Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052961 molybdenite Inorganic materials 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Images
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
- H01R39/64—Devices for uninterrupted current collection
- H01R39/646—Devices for uninterrupted current collection through an electrical conductive fluid
Landscapes
- Motor Or Generator Current Collectors (AREA)
- Lubricants (AREA)
Description
- The invention relates to a method of transmitting a current from a first conductor to a second conductor, which conductors are in contacting relationship along a contact interface. The invention also relates to a device for transferring current from a first conductor to a second conductor via a contact interface.
- When electrical current needs to be transferred between parts that show relative rotation, such as machine parts, wind turbines or offshore high voltage swivels, many different solutions are known, some of which allow a limited angle of rotation while others allow unlimited rotational angles. Increasing high voltages, such as several KV need to pass from one electrode to the other via the contact interface. In known slide contacts, such as available from Schleifring or Cavotec, a stack of rings or discs is contacted by one or more sliding contacts or carbon brushes per ring to provide electrical contacts. The slide contacts have several disadvantages such as wear of the contact surfaces. Wear is counteracted by the use of expensive metal alloys and reduced contact pressures between the slide contacts and the rings. In some signal slip ring units a paste is used for offering conductivity and lubrication, typical components including grease and a high content of silver or copper particles, such as for instance Highly Conductive Grease, marketed by the firm Electrolube.
- For contacts that are not in a sliding contacting relationship, such as for instance in circuit breakers, a high current needs to be passed through the contact interface which current is limited by the resistance formed by the interfaces at microscopic level not forming a even surface. Increasing the contact pressures may cause local deformation and results in a decrease of the resistance across the contact interface.
- From
EP 0 089 725 , a rotary device for transfer of electric power is known in which in the gap between rotor and stator, mercury is used as a conductive fluid. The gap may have a width of about 15 µm. Mercury is environmentally undesirable in view of its toxic qualities and is difficult to contain by means of seals. Also a mixture of conductive particles and a non-conductive fluid is described as an alternative for the liquid metal, such as silver particles and ethylene glycol. The known device has as a disadvantage that the metal slurry formed by the particles and liquid may over time be unevenly distributed in the gap, resulting in irregular current transfer and increased wear. - In
WO97/37847 - It is an object of the present invention to provide a method in which the resistance between the conductors is reduced and which provides for a stable transfer of relatively high currents from one conductor to the other via the contact interface.
- Hereto the method according to the invention is characterized in that the contact interface forms a plane, the lubricant comprising a non-conducting oil with a viscosity between 1 and 10 mm2/s, the particle size being between 1 and 1000 nm, providing an insulating behavior at gap widths between the first and second conductor above 0.5 mm and becoming highly conductive at gap widths below 0.1 mm.
- The applicants have surprisingly found that by the use of a colloidal suspension of conducting particles, the resistance at the interface can be strongly reduced and currents can be increased. The liquid with particles as a colloidal suspension provides a stable and homogeneous medium allowing uniform current transmission on each position of the conductor that is stable over a large period of time. It was found that the colloidal suspension according to the invention provides an insulating behavior at gap distances between the first and second conductors above 0.5 mm but becomes highly conductive at smaller gap widths, such as gaps smaller than 0.5 mm, preferably smaller than 0.3 mm and more preferably smaller than 0.1 mm.
- No accumulation or increased concentration of suspended particles was found to occur over time. This stability of the colloidal suspension over time ensures that the combination of conductivity at short distances (small gap widths) and isolation at larger distances prevents either loss of conducting contact between the conductors or possible short circuits forming.
- The colloidal suspension may comprise lubricating or preferably penetrating oil. Two exemplary brands of oil that can be successfully applied are high quality penetrating oil based on graphite in a spray can, marketed by Griffon under trade name IMAL Penetrating Oil (see www.griffon.eu) or Standard Penetrating Oil marketed by LATOL in jerry can (see www.metropa-rotterdam.nl), both containing graphite particles in a colloidal suspension.
- A colloidal suspension is formed by a substance that is microscopically dispersed through the liquid, such that over time Brownian motion resists separation of the substances, and no separation of the substances occurs. The colloidal particles generally range in size from 1 nm to 1000 nm.
- The colloidal suspension according to the invention does not provide a conducting medium for gaps between the conductors that are larger than 0.5 mm but shows a highly increased conductivity when the conductors approach each other to form a gap with a width of 0.1mm and smaller. It is believed that the oil will transport the conducting particles into interspaces at the uneven areas of the contact interface and will bridge exiting gaps at the interface for establishing an improved conductive path. Hereby it was possible to transfer high currents at a voltage loss of less than 50 mV. It was for instance measured that by adding graphite oil between two copper contacts at 12 V DC and a current of 40A, the voltage loss was by 2/3 from 33mV to 11mV.
- With the term "contacting relationship" as used herein it is meant that the conductors may be in stationary or dynamic contact, such as rolling contact or sliding contact and may touch at the contact interface at pressures ranging from 0 to relatively high contact pressures or are separated at the contact interface by a distance of no more than 0.5 mm, preferably no more than 0.1mm. In case a gap is formed between the conductors, this gap is bridged by a film of fluid containing the conducting particles.
- It is noted that in
WO 2013/087487 the use of a lubricant in combination with a microstructure on an electrical plug type connector is known for reducing the frictional force required to engage the plug and socket. The lubricant may have for example, oil, grease, a paste or a solid-state lubricant such as graphite, CNT, Graphene MoS2 and admixtures thereof. No colloidal suspension of small-size conducting particles in a non-conducting liquid is disclosed however. - In a stationary embodiment, the conductors are interconnected by a connector device compressing the conductors together at the contact interface. It was found that two interconnected conductors, such as copper terminals that are connected by a bolted clamping, after time lose their contact pressure due to the oxidation and the effects of current transfer at the contact interface resulting in a widening gap between the conductors and a loosening of the conductors. This causes a need to regularly check and refasten the conductors on a frequent basis. By the use of the colloidal suspension at the interface between the conductors, it was found that loosening of the conductors does no longer occur and regular inspecting and refastening of the conductors is obviated.
- Suitable connector devices according to the invention comprise bolt and nut connections, resilient clamping connectors or plug and socket connections, bayonet connections, threaded connections and the like.
- In case the conductors move relative to one another along a contact interface plane, the oil will also help in lubricating the contact plane and prevents corrosion of the electrodes. In addition, the graphite particles will assist in reducing the friction coefficient of both conductors.
- The non conducting liquid may be formed by liquids, and are preferably oils either based on mineral oil distilled from crude oil (nafta) or based on synthetic oil.
- Preferably the liquid comprises an oil which facilitates suspension of the particles. These particles may comprise any kind of conductive particles either based on metals or carbon, and have preferably a size smaller than 1000 nm. A particularly advantageous form of particles are graphite particles. These particles are especially advantageous in case of movement at the contact interface as they exhibit both a conducting and a lubricating effect.
The conductors can be made of metal, such a metal typically used in slip ring applications for instance phosphor bronze, carbon or other conductive materials.
In a further embodiment, at least one of the conductors comprises a replaceable conducting material at the contact interface, comprising carbon, such as full carbon brushes or partly carbon and metal containing brushes. - The carbon containing replaceable parts, or "|carbon brushes" provide a conducting path and can be used in combination with the colloidal suspension as an additional path for current transfer or to serve as a backup in case the colloidal suspension is no longer present between the conductors. It was found that the combination of the replaceable conductors and the colloidal suspension according to the present invention results in increased lifetime of the replaceable conductors by reduction of wear and that formation of a slurry of carbon wear particles and non-conducting fluid did not occur. Hence there is no risk of short circuiting and homogeneous and stable current transfer is warranted at high currents. For instance for metal graphite brushes on phosphor bronze rings the resistance was found to drop by 33% and currents could be increased by 200%.
- The kinematic viscosity of the oil is preferably low in order to allow penetration between the conductors at the contact interface and may be between 2 and 10 mm2/s.
- In one embodiment, the conductors move relative to one another along a contact interface plane in a sliding manner, wherein a pressure at the contact interface is below 0.75 N/mm2.
- In a further embodiment, the conductors move relative to one another along a contact interface plane in a rolling manner, wherein a pressure at the contact interface is between 100-150 N/mm2. At these increased pressures, the uneven metal surfaces of the electrodes (for instance made of or containing copper) may be pressed together beyond the yield pressure of the softest metal such that improved electrical contact is achieved. Furthermore, the conductors that are pressed together along the contact interface plane are very stable and resistant to vibrations.
The conductors may first be moved relative to one another along a contact interface plane in a rolling manner without a current passing from one to the other. Hereby the contact interface plane is smoothened by rolling and the need for high pressure forces is obviated. Thereafter, the conductors can be moved relative to one another along the contact interface plane in a rolling manner at pressures of between 25% and 35% of the yield strength of the softest metal of the contacting metal conductors. The lower pressures at the contact interface may for copper lie between 30-70 N/mm2. - In an embodiment, a current density at the interface plane is between 50 and 75 A/mm2. By use of the insulating oil containing conducting particles, a high current can be passed through a small contact surface at relatively low resistance (in the voltage range of 20-50 mV), which is favorable for power transfer.
- In case low currents are transferred, for instance in the case of signal transfer (Voltages in the range of 1-5 mV), the resistance can be very low. Simultaneously, the signal noise is reduced to very low values such as 0.1-0.5 mV for copper, allowing high data transfer rates. This is important for instance when transmitting high resolution camera images from a rotating support to a cable, the invention allowing establishing a 1 GB/s Ethernet connection via the moving contacts.
- A device for transferring current from a first conductor to a second conductor via a contact interface may comprise a reservoir containing a non-conducting liquid with conducting particles therein, the contact interface being in fluid communication with the reservoir.
- The contact interface may be placed within the reservoir to be submerged in the oil, or the reservoir may be connected to a dispenser for dispensing non conducting liquid with conducting particles therein, onto the contact interface. This can be in continuous or intermittent flow when the oil remains in place at the contact interface.
- The colloidal graphite oil has as an advantage that it avoids short circuits as the graphite particles do not stick together and the oil remains non-conductive.
- Some embodiments of a device according to the invention will be explained in detail with reference to the accompanying drawings. In the drawings:
-
Fig. 1 shows a schematic view of moving electrodes submerged in a non-conducting oil containing conducting particles suspended therein, -
Fig. 2 shows a schematic view of an alternative configuration of moving electrodes connected to a dispenser device for supplying non-conducting oil with conducting particles to the contact interface, -
Fig. 3 shows a schematic view of a circuit breaker arrangement with oil supplied to the contact interface., -
Fig. 4 shows a stationary bolted connection with a colloidal suspension at the interface, -
Figs. 5 and 6 show embodiments of rotary conductors in combination with carbon brushes, and -
Fig. 7 shows a graph of the conductivity of the colloidal suspension according to the invention vs. the gap width between the conductor for conductors with and without a colloidal suspension according to the invention. -
Fig. 1 shows a set-up in which a copper tube 1 rolls on a flat copper strip 2. Current is supplied from power supply 8 and flows via motor 7, through the contact 3, the tube 1 and through strip 2 to contact 4. Weights are placed on the tube 1 such that the pressure at the contact interface was about 150 N/mm2. In thereservoir 5 penetrating oil containing graphite was placed, such that the contact interface 6 was submerged below the oil level. At currents of 60A/mm2 and at a voltage of 12V, the voltage loss that was measured across the tube 1 and the strip 2 was 10-20 mV.
Fig. 2 shows a stationary ring-shapedouter electrode 11 and a rotatinginner electrode 10, rolling along thecontact interface 16. Insulating oil containing graphite particles is stored in container 17'. Via adispenser 12 comprising apump 13, aduct 14 and anoutflow device 15, a film of oil containing graphite particles is applied onto thecontact interface 16, hence strongly reducing the resistance. - Current is supplied by
contact 17 to the inner electrode and flows via theinner electrode 10 to theouter electrode 11 andouter contact terminal 18. -
Fig. 3 shows a stationary application of the oil in acircuit breaker 22 comprising afirst electrode 20 and asecond electrode 21, that can be separated by withdrawingelectrode 20 away fromcontact interface 23. Areservoir 24 comprising oil with conducting particles therein surrounds thecontact interface 23. -
Fig. 4 shows a first andsecond conductors bolt 34 andnut 33. A double internal andexternal seal 35 such as an O-ring or a metal seal, is provided between the conductors to contain thecolloidal suspension 36 within the gap d, which may have a width of 0.1 mm or less. -
Fig. 5 shows ainner conductor 40 and a rotaryouter conductor 41 comprising four replaceable carbon brushes 42, 42' in combination with the colloidal suspension forming a layer around theinner conductor 40. The suspension layer can be created by rotating in a part submerged condition (not shown in figure) or by supplying the suspension by means of spraying, dripping, a contacting wick or any other suitable means. -
Fig. 6 shows the carbon brushes 42,42'being placed on a rotaryinner conductor 40 and a stationaryouter conductor 41 in combination with thecolloidal suspension layer 43. -
Fig. 7 shows a graph of the gap resistance in Ohm vs. the gap width in mm, with and without the colloidal suspension according to the invention. The measurements were carried out for two copper contacts, one having a flat surface and the other a half circular rod diameter of 15mm. It was found that in dry conditions, the resistance increases abruptly at a gap width of about 0.03 mm and that using graphite containing oil as a colloidal suspension as obtained from the firm Metropa in The Netherlands, a low resistance is maintained at larger gap widths (up to 0.04 mm). After 0.04 mm also for the colloidal suspension of graphite particles in oil, a high increase in resistance was observed. Surprisingly, the high conductivity due to the colloidal suspension is present in a relatively narrow gap.
Claims (9)
- Method of transmitting a current from a first conductor (1,10,20,31,40) to a second conductor (2,11,21,32,41) which conductors are in contacting relationship along a contact interface (6,16,23) wherein a liquid lubricant forming a colloidal suspension of graphite particles is introduced at the contact interface, characterized in that the contact interface forms a plane, the lubricant comprises a non-conducting oil with a viscosity between 1 and 10 mm2/s, the particle size being between 1 and 1000 nm, providing an insulating behavior at gap widths between the first and second conductor above 0.5 mm and becoming highly conductive at gap widths below 0.1 mm.
- Method according to claim 1, wherein the conductors move relative to one another along a contact interface plane in a sliding manner, wherein a pressure at the contact interface preferably is below 0.75 N/mm2.
- Method according to claim 1, wherein the conductors move relative to one another along a contact interface plane in a rolling manner, wherein a pressure at the contact interface preferably is between 100-150 N/mm2.
- Method according to claim 3, wherein the conductors are first moved relative to one another along a contact interface plane in a rolling manner without a current passing from one to the other, and are thereafter moved relative to one another along the contact interface plane in a rolling manner, wherein a pressure at the contact interface is between 30-70 N/mm2.
- Method according to any of claims 2-4, wherein at least one of the conductors (40,41) comprises a replaceable conducting material (42,42') at the contact interface, comprising carbon.
- Method according to claim 1, wherein the conductors are stationary with respect to one another and are interconnected by a connector device (33,34) pressing the conductors together at the contact interface.
- Method according to any of the preceding claims, wherein a current density at the contact interface is at least 40 A/mm2, preferably between 40 and 60 A/mm2.
- Method according to any of the preceding claims, wherein between the contacts data signals are transferred at rates of over 10MB/s.
- Method according to any of the preceding claims, wherein the conductors at the contact interface are spaced apart no more than 0.5 mm, preferably no more than 0.1 mm.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL2012886A NL2012886B1 (en) | 2014-05-26 | 2014-05-26 | Method and device for reducing the resistance between two conductors. |
PCT/NL2015/050373 WO2015183081A1 (en) | 2014-05-26 | 2015-05-22 | Method and device for reducing the resistance between two conductors |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3149812A1 EP3149812A1 (en) | 2017-04-05 |
EP3149812B1 true EP3149812B1 (en) | 2020-07-08 |
Family
ID=52350256
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15732472.4A Active EP3149812B1 (en) | 2014-05-26 | 2015-05-22 | Method for reducing the resistance between two conductors |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3149812B1 (en) |
DK (1) | DK3149812T3 (en) |
NL (1) | NL2012886B1 (en) |
WO (1) | WO2015183081A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4283800A1 (en) | 2022-05-25 | 2023-11-29 | MERSEN Osterreich Hittisau Ges.m.b.H | Rotary electrical contact assembly |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL8201166A (en) * | 1982-03-22 | 1983-10-17 | Philips Nv | DEVICE FOR TRANSFER OF ELECTRIC ENERGY. |
WO1997037847A1 (en) * | 1996-04-05 | 1997-10-16 | Kuhlmann Wilsdorf Doris | Continuous metal fiber brushes |
US7557485B1 (en) * | 2004-10-08 | 2009-07-07 | The United States Of America As Represented By The Secretary Of The Navy | Ion conducting electrolyte brush additives |
EP2528167B1 (en) * | 2011-05-25 | 2014-04-30 | Tyco Electronics AMP GmbH | Electrical contact element with a cover layer having a chemical reducing agent, electrical contact arrangement and methods for manufacturing an electrical contact element and for reducing oxidization of a contact section of an electrical contact element |
DE102011088793A1 (en) * | 2011-12-16 | 2013-06-20 | Tyco Electronics Amp Gmbh | Electrical connector with microstructured contact element |
-
2014
- 2014-05-26 NL NL2012886A patent/NL2012886B1/en not_active IP Right Cessation
-
2015
- 2015-05-22 EP EP15732472.4A patent/EP3149812B1/en active Active
- 2015-05-22 DK DK15732472.4T patent/DK3149812T3/en active
- 2015-05-22 WO PCT/NL2015/050373 patent/WO2015183081A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
NL2012886B1 (en) | 2016-06-08 |
EP3149812A1 (en) | 2017-04-05 |
WO2015183081A1 (en) | 2015-12-03 |
DK3149812T3 (en) | 2020-10-12 |
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