• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a device 100 for suspending three current transformers 2,2’,2’’ on a busbar rig 4 in a wind turbine, wherein said device in the orientation intended during use comprises: a frame 6 comprising a first set of support bars 8,8’ and a second set of support bars 10,10’, wherein said first set of support bars 8,8’ and said second set of support bars 10,10’ are arranged in said frame at two different vertical levels; wherein said first set of support bars 8,8’ comprises one mounting bracket assembly 12 for a current transformer; and wherein said second set of support bars comprises two mounting bracket assemblies 12’,12’’ for a current transformer 2,2’,2’’; wherein each mounting bracket assembly 12,12’,12’’ for a current transformer 2,2’,2’’ comprises a first portion 14 having a first end 16 and a second end 18; and an second portion 20, wherein said first portion and said second portion areconfigured for being attached to each other in a way where said current transformer 2,2’,2’’ isaccommodated between said second portion 20 and said first portion 14; wherein said first end of said first portion and wherein said second end of said first portion of said mounting bracket assembly are being configured for being attached to said first set of support bars 8,8’ and said second set of support bars 10,10’, respectively.
    公开号:DK201800383A1
    申请号:DKP201800383
    申请日:2018-07-12
    公开日:2019-10-17
    发明作者:Kieffer Sørensen Mikael
    申请人:Scada International A/S；
    IPC主号:
    专利说明:

    A device for suspending three current transformers in a wind turbine
    Field of the invention
    The present invention relates in general to the field of wind turbines. More specifically the present invention relates in a first aspect to a device for suspending three current transformers on a busbar rig in a wind turbine. In a second aspect the present invention relates to a system for measuring power supplied to the grid from a wind turbine, wherein said system comprises a device according to the first aspect in combination with three current transformers. In a third aspect the present invention relates to a busbar rig comprising a device according to the first aspect of the present invention or comprising a system according to the second aspect of the present invention. In a fourth aspect, the present invention relates to a use of a device according to the first aspect of the present invention or of a system according to the second aspect of the present invention, or of a busbar rig according to the third aspect of the present invention in performing a measurement of the power supplied to the grid from a wind turbine. In a fifth aspect the present invention relates to a wind turbine comprising a device according to the first aspect of the present invention or comprising a system according to the second aspect of the present invention, or comprising a busbar rig according to the third aspect of the present invention.
    Background of the invention
    Within the field of wind turbines and the operation thereof it is customary that the company responsible for setting up, operating and maintaining a wind turbine is different from the company operating the grid into which electric power generated by the wind turbine is supplied.
    As payment is required from the company operating the grid to the company operating the wind turbine, it is in the interest of the company operating the grid that the payment for power supplied to the grid is based on the magnitude of power actually delivered to the grid and not just based on the magnitude of power produced and measured on the generator or on the transformer of the wind turbine.
    Accordingly, in order to provide for a more accurate measurement of the power actually being supplied to the grid from a wind turbine it has been practice for the latest decades to arrange a current transformer on the busbar arranged between the grid on the one hand and transformer and/or converter of the wind turbine on the other hand.
    Preferably, it is customary to arrange such a current transformer on a busbar relating to each of the phases of the power output of the wind turbine.
    A current transformer simple comprises a coil with one or more windings. The current transformer is placed around a busbar in such a way that current flowing in the busbar will
    DK 2018 00383 A1 induce a current in the coil of the current transformer which in turn can be measured and which will be representative of the magnitude of power supplied to the grid.
    Now, as high voltages are present in the electric installations of the secondary side of a power transformer of a wind turbine, electric hazards are involved in case any tampering with these installations are being performed.
    Therefore, severe safety regulations are to be complied with in designing and setting up the busbar suspension rig and once set up, there are strict restrictions regulating which types of modifications and add-ons are allowed in this design.
    Moreover, it is important in relation to the accuracy of the measurement being performed on the current transformer that the busbar is arranged in the center of the current transformer.
    For these reasons, arranging a current transformer on the busbar of a wind turbine may pose certain challenges, as safety regulations have to be complied with.
    The present invention in its various aspect seeks to solve these problems.
    Accordingly, it is an objective of the present invention to provide devises and uses which solves these problems.
    Brief description of the invention
    These objectives are fulfilled according to the first, the second, the third, the fourth and the fifth aspect of the present invention.
    Accordingly, the first aspect of the present invention relates to a device for suspending three current transformers on a busbar rig in a wind turbine, wherein said device in the orientation intended during use comprises:
    -a frame comprising a first set of support bars and a second set of support bars, wherein said first set of support bars and said second set of support bars are arranged in said frame at two different vertical levels;
    -wherein said first set of support bars comprises one mounting bracket assembly for a current transformer; and wherein said second set of support bars comprises two mounting bracket assemblies for a current transformer;
    -wherein each mounting bracket assembly for a current transformer comprises a first portion having a first end and a second end; and a second portion, wherein said first portion and said second portion are configured for being attached to each other in a way where said current transformer is accommodated between said second portion and said first portion;
    -wherein said first end of said first portion and wherein said second end of said first portion of said mounting bracket assembly are being configured for being attached to said first set of support bars and said second set of support bars, respectively.
    DK 2018 00383 A1
    In a second aspect the present invention relates to a system for measuring power supplied to the grid from a wind turbine, said system comprises a device according to the first aspect of the present invention in combination with three current transformers, wherein each said current transformer is being connected to its own individual mounting bracket assembly of said device.
    In a third aspect the present invention relates to a busbar rig comprising a device according to the first aspect of the present invention or comprising a system according to the second aspect of the present invention.
    In a fourth aspect the present invention relates to a use of the device according to first aspect of the present invention or of a system according to the second aspect of the present invention, or of a busbar rig according to the third aspect of the present invention in performing a measurement of the power supplied to the grid from a wind turbine.
    In a fifth aspect the present invention relates to a wind turbine comprising a device according to the first aspect of the present invention or comprising a system according to the second aspect of the present invention, or comprising a busbar rig according to the third aspect of the present invention.
    The present invention in its various aspects provides for a secure and reliable arrangement of a current transformer in an existing busbar rig in a wind turbine without the necessity of interfering or modifying or tampering with the design of such an existing busbar rig to an extend that violates safety regulations of such a rig.
    Furthermore, the present invention provides for arranging a current transformer around each busbar in a bundle of three busbars in relative close proximity, corresponding to the three phases of a grid, in such a way that the measurement made in respect of one current transformer does not interfere with the measurements made in respect of any of the two other current transformers.
    This is an advantage in that current flowing in one busbar may effect a shadowing current to appear in a current transformer of second busbar arranged in close proximity of the first busbar, thereby leading to false readings of the current transformer of the second busbar.
    Moreover, the present invention in in some embodiments provide for allowing adjustment of the current transformer in the tree dimensional space with the view to attain an accurate centering of the busbar in the center of the current transformer.
    Brief description of the figures
    Fig. 1 is a perspective view illustrating the device of the invention and its arrangement with three current transformers.
    DK 2018 00383 A1
    Fig. 2 is an explosive view illustrating one embodiment of a mounting bracket assembly of the device of the invention.
    Fig. 3 is a perspective view illustrating the device of fig. 2 in an assembled state.
    Fig. 4 is a perspective view illustrating the system of the invention arranged in an existing busbar rig of a wind turbine.
    Detailed description of the invention
    The first aspect of the present invention
    Accordingly, the first aspect of the present invention relates to a device for suspending three current transformers on a busbar rig in a wind turbine, wherein said device in the orientation intended during use comprises:
    -a frame comprising a first set of support bars and a second set of support bars, wherein said first set of support bars and said second set of support bars are arranged in said frame at two different vertical levels;
    -wherein said first set of support bars comprises one mounting bracket assembly for a current transformer; and wherein said second set of support bars comprises two mounting bracket assemblies for a current transformer;
    -wherein each mounting bracket assembly for a current transformer comprises a first portion having a first end and a second end; and a second portion, wherein said first portion and said second portion are configured for being attached to each other in a way where said current transformer is accommodated between said second portion and said first portion;
    -wherein said first end of said first portion and wherein said second end of said first portion of said mounting bracket assembly are being configured for being attached to said first set of support bars and said second set of support bars, respectively.
    Accordingly, the device of the first aspect of the present invention comprises a frame having a first set of support bars and a second set of support bars, said first set of support bars and said second set of support bars being arranged in different vertical levels, wherein one set of support bars carries one mounting bracket assembly for a current transformer and wherein the other set of support bars carries two mounting bracket assemblies for a current transformer.
    In one embodiment of the device according to the first aspect of the present invention, the first set of support bars are arranged at a lower level relative to said second set of support bars; or alternatively the first set of support bars are arranged at an upper level relative to said second set of support bars.
    DK 2018 00383 A1
    The two different levels of arrangement of the sets of support bars allow for securing sufficient distance between the current transformers which in turn will avoid interference between individual current transformers and neighboring busbars arranged in the mounting bracket assemblies to be fixed to these sets of support bars.
    In one embodiment of the device according to the first aspect of the present invention, the first portion of the mounting bracket assembly comprises two elongate lower elements which are being connected by an end element at each end of said elongate elements.
    Hereby a current transformer can be securely fixed to the device of the invention.
    In one embodiment of the device according to the first aspect of the present invention, each of the elongate lower elements comprises one or more through-going holes for accommodating a bolt, such as one or more elongate through-going holes.
    Providing the elongate lower elements with one or more elongate through-going holes allows for adjusting the position of a current transformer in one dimension, relative to said elongate lower elements.
    In one embodiment of the device according to the first aspect of the present invention, the second portion of said mounting bracket assembly comprises two elongate upper elements.
    Hereby it will be easy to guide a bus bar through a central part of the mounting bracket assembly and also through a central hole of a current transformer to be accommodated by that mounting bracket assembly.
    In one embodiment of the device according to the first aspect of the present invention the device further comprises a plurality of bolts and nuts for fastening said first portion and said second portion of the mounting bracket assembly to each other.
    Hereby the current transformer can be securely fixed to the mounting bracket assembly.
    In one embodiment of the device according to the first aspect of the present invention the device further comprises one or more connecting elements, wherein said first end of said first portion of said mounting bracket assembly and wherein said second end of said first portion of said mounting bracket assembly are being configured for being attached to said first set of support bars and said second set of support bars, respectively via said connecting element.
    Accordingly, the connection element serves as connecting one end of a mounting bracket assembly to a support bar of the frame of the device.
    In one embodiment of the device according to the first aspect of the present invention the connecting element comprises one or more through-going holes, such as one or more elongate through-going holes.
    Providing the connecting elements with one or more elongate through-going holes allows for adjustment of the exact position of the mounting bracket assembly, in one specific dimension, relative to the frame of the device.
    DK 2018 00383 A1
    In one embodiment of the device according to the first aspect of the present invention the frame comprises one or more upper frame elements, wherein said upper frame element being configured for being attached to an existing busbar rig of a wind turbine.
    In one embodiment of the device according to the first aspect of the present invention one or more of said one or more upper frame elements comprises one or more through-going holes, thereby allowing attachment of said frame to said existing busbar rig of a wind turbine.
    In one embodiment of the device according to the first aspect of the present invention the existing busbar rig of a wind turbine is of the type comprising a frame consisting of a plurality of frame elements.
    Hereby the frame of the device of the first aspect of the present invention is easily attached to the existing busbar rig.
    In one embodiment of the device according to the first aspect of the present invention the three mounting bracket assemblies are arranged in said frame in a common vertical plane.
    Hereby three busbars essentially defining a vertical plane may each be directed through a current transformer suspended by a mounting bracket assembly of the device of the first aspect of the present invention.
    In one embodiment of the device according to the first aspect of the present invention the device further comprising a plurality of bolts and nuts for securing each of said mounting bracket assemblies to said support bars of said frame.
    In one embodiment of the device according to the first aspect of the present invention the first portion of said mounting bracket assembly is configured for being arranged below said second portion said mounting bracket assembly; or wherein said second portion of said mounting bracket assembly is configured for being arranged below said first portion said mounting bracket assembly
    The second aspect of the present invention
    In a second aspect the present invention relates to a system for measuring power supplied to the grid from a wind turbine, said system comprises a device according to the first aspect of the present invention in combination with three current transformers, wherein each said current transformer is being connected to its own individual mounting bracket assembly of said device
    The third aspect of the present invention
    DK 2018 00383 A1
    In a third aspect the present invention relates to a busbar rig comprising a device according to the first aspect of the present invention or comprising a system according to the second aspect of the present invention.
    The fourth aspect of the present invention
    In a fourth aspect the present invention relates to a use of the device according to first aspect of the present invention or of a system according to the second aspect of the present invention, or of a busbar rig according to the third aspect of the present invention in performing a measurement of the power supplied to the grid from a wind turbine.
    The fifth aspect of the present invention
    In a fifth aspect the present invention relates to a wind turbine comprising a device according to the first aspect of the present invention or comprising a system according to the second aspect of the present invention, or comprising a busbar rig according to the third aspect of the present invention.
    Referring now to the drawings for better illustrating the present invention, fig. 4 is a perspective view illustrating the type of busbar rig the present invention concerns.
    Fig. 4 shows an existing prior art busbar rig comprising a frame 36 from which three busbars 5 are extending downward in order to transfer power produced in a wind turbine to cables being connected to the grid. In fig. 4 the prior art busbar rig comprises the upper part denoted with reference No. 36. Below the existing or prior art busbar rig 36 is arranged a system 200 according to the second aspect of the invention and comprising a device 100 according to the first aspect in combination with three current transformers 2. This is explained in more detail below with reference to Fig. 1, 2, and 3.
    Fig. 1 is a perspective view illustrating the device of the invention and its arrangement with three current transformers. Fig. 1 shows the device 100 comprising the frame 6, which frame in turn comprises a first set of support bars 8,8' and a second set of support bars 10,10', wherein the first set of support bars 8,8' and the second set of support bars 10,10' are arranged in said frame at two different vertical levels.
    The first set of support bars 8,8' carries one mounting bracket assembly 12 for a current transformer; and the second set of support bars carries two mounting bracket 12’,12” assemblies for a current transformer.
    Each mounting bracket assembly 12,12',12'' for a current transformer comprises a first portion 14 having a first end 16 and a second end 18; and a second portion 20.
    DK 2018 00383 A1
    The first portion and the second portion of each mounting bracket assembly 12,12’,12’’ is configured for being attached to each other in a way where the current transformer 2,2’,2’’ is accommodated between the second portion 20 and said first portion 14;
    It is seen in Fig. 1 that the first end of the first portion 14 and the second end of the first portion 14 of the mounting bracket assembly are being attached to the first set of support bars 8,8’ and the second set of support bars 10,10’, respectively.
    Fig. 1 shows that the first set of support bars 8,8’ are arranged at a higher level relative to the second set of support bars 10,10’.
    Alternatively, the first set of support bars 8,8’ may be arranged at a lower level relative to the second set of support bars 10,10’.
    Arranging the two sets of support bars 8,8’,10,10’ respectively at different vertical levels provides for arranging the current transformers 2,2’,2’’ at a sufficient distance to each other, thereby securing accurate measurements by these current transformers.
    Fig. 2 is an explosive view illustrating one embodiment of a mounting bracket assembly 12,12’,12’’ of the device of the invention.
    The mounting bracket 12,12’,12’’ illustrated in fig. 3 comprises the first portion 14 having a first end 16 and a second end 18; and a second portion 20.
    The first portion 14 comprises two elongate elements 22,22’which are being connected by an end element 24,24’at each end of the elongate elements.
    It is seen that each of the elongate elements 22,22’ comprises a number of through-going holes 26 for accommodating a bolt.
    Hereby the current transformer 2,2’,2’’ can be securely fixed to the first portion 14 and moreover the exact position of the current transformer 2,2’,2’’ in a lengthwise direction in relation to the two elongate lower elements 22,22’ may be adjusted.
    These bolts are penetrating a hole in the second portion 20 of the mounting bracket assembly 12,12’,12’’ which in this embodiment comprises two elongate elements 28,28’.
    Accordingly, a plurality of bolts and nuts for fastening the lower portion 14 and the upper portion 20 of the mounting bracket assembly 12,12’,12’’ to each other are included in the device and the system of the invention.
    Fig. 2 shows that the current transformer 2 comprises a central hole 40 for accommodating a busbar of the wind turbine.
    Fig. 3 illustrates in a perspective view the embodiment of Fig. 2 in an assembled state.
    In fig. 2 and 3 the first element 14 of the mounting bracket assembly 12,12’,12’’ is arranged below the second element 20 thereof. In an alternative embodiment the opposite situation applies.
    DK 2018 00383 A1
    Now returning to Fig. 4, Fig. 4 is a perspective view illustrating the system of the invention arranged in an existing busbar rig of a wind turbine. Fig. 4 shows part of the frame 36 of an existing busbar rig of a wind turbine and which comprises a number of frame elements 38.
    Below the frame 36 of the existing busbar rig is attached a frame 6 of the system 200 according to the first aspect of the present invention. The system 200 comprises three mounting bracket assemblies as disclosed above. Each mounting bracket assembly 12,12’,12’ comprises a corresponding current transformer 2,2’,2’’.
    The existing busbar rig comprises three busbars 5, each representing a single phase of the voltage supplied to the grid and extending in a downward direction from the frame 26 of the rig.
    When mounted on the frame 36 of the existing busbar rig, the system 200 of the second aspect of the present invention is configured in such a way that each busbar 5 can be directed through the central opening 40 of the current transformer 2,2’,2’’.
    As the three current transformers 2,2’,2’’ are arranged in two different vertical levels, it is assured that a sufficient distance between two adjacent current transformers 2,2’,2’’ is becoming large enough to ensure that a the current flowing in one busbar does not interfere with the coil of one of the a current transformer associated with one of the other busbars, and thereby impart a false reading from that other current transformer.
    Also seen in Fig. 4 is that connecting elements 30 are provided for connecting the lower portion 14 of the mounting bracket assembly 12,12’,12’’ to the first set of support bars 8,8’ and said second set of support bars 10,10’.
    The connecting elements 30 comprises a plurality of elongate through-going holes 32.
    Hereby the exact position of the current transformer 2,2’,2’’ on the first portion of the mounting bracket assembly 12,12’,12’’ can be adjusted.
    Combined with the elongate holes 26 in the elongate elements 22,22, the exact position of the current transformer 2,2’,2’’ on the first portion of the mounting bracket assembly 12,12’,12’’ can be adjusted in two mutually perpendicular directions.
    The frame 6 comprises a number of upper frame elements 38 which comprises a plurality of through-going holes for allowing bolting the frame 6 to the frame 36 of the existing busbar rig. 4 can be avoided.
    It should be understood that all features and achievements discussed above and in the appended claims in relation to one aspect of the present invention and embodiments thereof apply equally well to the other aspects of the present invention and embodiments thereof.
    DK 2018 00383 A1
    List of reference numerals
    2,2’,2”Current transformer4Busbar rig of wind turbine5Busbar of busbar rig of wind turbine6Frame of device8,8'Support bars of first set of support bars10,10'Support bars of second set of support bars12,12',12''Mounting bracket assembly14First portion of mounting bracket assembly16First end of first portion of mounting bracket assembly18Second end of first portion of mounting bracket assembly20Second portion of mounting bracket assembly22,22'Elongate lower elements of first portion of mounting bracket assembly24,24'End element of first portion of mounting bracket assembly26Through-going hole in elongate element of first portion of mounting bracket assembly28,28'Elongate elements of second portion of mounting bracket assembly30Connecting element32Through-going hole in connecting element34Upper frame element of frame of device36Frame of existing busbar rig of a wind turbine38Frame element of frame of existing busbar rig of a wind turbine40Central hole in current transformer for accommodating a busbar100Device according to the invention200System according to the invention
    DK 2018 00383 A1
    权利要求:
    Claims (18)
    [1] Claims
    1. A device (100) for suspending three current transformers (2,2',2'') on a busbar rig (4) in a wind turbine, wherein said device in the orientation intended during use comprises:
    -a frame (6) comprising a first set of support bars (8,8)' and a second set of support bars (10,10'), wherein said first set of support bars (8,8') and said second set of support bars (10,10') are arranged in said frame at two different vertical levels;
    -wherein said first set of support bars (8,8') comprises one mounting bracket assembly (12) for a current transformer; and wherein said second set of support bars comprises two mounting bracket assemblies (12',12'') for a current transformer (2,2',2'');
    -wherein each mounting bracket assembly (12,12',12'') for a current transformer (2,2',2'') comprises a first portion (14) having a first end (16) and a second end (18); and an second portion (20), wherein said first portion and said second portion are configured for being attached to each other in a way where said current transformer (2,2',2'') is accommodated between said second portion (20) and said first portion (14);
    -wherein said first end of said first portion and wherein said second end of said first portion of said mounting bracket assembly are being configured for being attached to said first set of support bars (8,8') and said second set of support bars (10,10'), respectively.
    [2] 2. A device (100) according to claim 1, wherein said first set of support bars (8,8') are arranged at a lower level relative to said second set of support bars (10,10'); or wherein said first set of support bars (8,8') are arranged at an upper level relative to said second set of support bars (10,10').
    [3] 3. A device (100) according to claim 1 or 2, wherein said first portion (14) of said mounting bracket assembly (12,12',12'') comprises two elongate lower elements (22,22') which are being connected by an end element (24,24') at each end of said elongate elements.
    [4] 4. A device (100) according to claim 3, wherein each said elongate lower elements (22,22') comprises one or more through-going holes (26) for accommodating a bolt, such as one or more elongate through-going holes.
    [5] 5. A device (100) according to any of the preceding claims, wherein said second portion (20) comprises two elongate upper elements (28,28').
    [6] 6. A device (100) according to any of the preceding claims further comprises a plurality of bolts and nuts for fastening said first portion (14) and said second portion (20) of said mounting bracket assembly (12,12',12'') to each other.
    [7] 7. A device (100) according to any of the preceding claims further comprising one or more connecting elements (30), wherein said first end (16) of said first portion of said mounting bracket assembly (12,12',12'') and wherein said second end (18) of said first portion of said mounting bracket assembly (12,12',12'') are being configured for being attached to said first
    DK 2018 00383 A1 set of support bars (8,8') and said second set of support bars (10,10'), respectively via said connecting element (30).
    [8] 8. A device (100) according to claim 7, wherein said connecting element (30) comprises one or more through-going holes (32), such as one or more elongate through-going holes.
    [9] 9. A device (100) according to any of the preceding claims, wherein said frame (6) comprises one or more upper frame elements (34), wherein said upper frame element being configured for being attached to an existing busbar rig (4) of a wind turbine.
    [10] 10. A device (100) according to claim 9, wherein one or more of said one or more upper frame elements (34) comprises one or more through-going holes, thereby allowing attachment of said frame (6) to said existing busbar rig (4) of a wind turbine.
    [11] 11. A device (100) according to any of the preceding claims, wherein said existing busbar rig (4) of a wind turbine is of the type comprising a frame (36) consisting of a plurality of frame elements (38).
    [12] 12. A device (100) according to any of the preceding claims, wherein said three mounting bracket assemblies (12,12',12'') are arranged in said frame in a common vertical plane.
    [13] 13. A device (100) according to any of the preceding claims further comprising a plurality of bolts and nuts for securing each of said mounting bracket assemblies (12,12',12'') to said support bars (8,8',10,10') of said frame (6).
    [14] 14. A device (100) according to any of the preceding claims, wherein said first portion (14) of said mounting bracket assembly (12,12',12'') is configured for being arranged below said second portion (20) of said mounting bracket assembly; or wherein said second portion (20) of said mounting bracket assembly (12,12',12'') is configured for being arranged below said first portion (14) of said mounting bracket assembly
    [15] 15. A system (200) for measuring power supplied to the grid from a wind turbine, said system comprises a device (100) according to any of the preceding claims in combination with three current transformers (2,2',2''), wherein each said current transformer is being connected to its own individual mounting bracket assembly (12,12',12'') of said device.
    [16] 16. A busbar rig comprising a device (100) according to any of the claims 1 - 14, or comprising a system (200) according to claim 15.
    [17] 17. Use of a device (100) according to any of the claims 1 - 14 or of a system (200) according to claim 15, or of a busbar rig according to claim 16 in performing a measurement of the power supplied to the grid from a wind turbine.
    [18] 18. A wind turbine comprising a device (100) according to any of the claims 1 - 14 or comprising a system (200) according to claim 15, or comprising a busbar rig according to claim 16.
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    同族专利:
    公开号 | 公开日
    DK179944B1|2019-10-17|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2019-10-17| PAT| Application published|Effective date: 20191017 |
    2019-10-17| PME| Patent granted|Effective date: 20191017 |
    优先权:
    申请号 | 申请日 | 专利标题
    DKPA201800383A|DK179944B1|2018-07-12|2018-07-12|A device for suspending three current transformers in a wind turbine|DKPA201800383A| DK179944B1|2018-07-12|2018-07-12|A device for suspending three current transformers in a wind turbine|
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