CN109613317A - High-precision rogowski coil - Google Patents
High-precision rogowski coil Download PDFInfo
- Publication number
- CN109613317A CN109613317A CN201811441616.7A CN201811441616A CN109613317A CN 109613317 A CN109613317 A CN 109613317A CN 201811441616 A CN201811441616 A CN 201811441616A CN 109613317 A CN109613317 A CN 109613317A
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- CN
- China
- Prior art keywords
- flexible back
- back bone
- enameled wire
- spring
- lead
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- 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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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/02—Coils wound on non-magnetic supports, e.g. formers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/04—Arrangements of electric connections to coils, e.g. leads
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention discloses a kind of high-precision rogowski coils, the ring bodies constituted including the ignition lead, enameled wire and silicone tube that set gradually from the inside to the outside, enameled wire is wound around on ignition lead, the both ends of ignition lead and enameled wire are connected by connector, setting bucking coil and lead-out wire in connector, one end of bucking coil is connected with enameled wire, the other end is connected with lead-out wire；Flexible back bone is set on the inside of its ring-type of ignition lead, four springs arranged with Rogowski coil center circular array are fixedly installed in its ring inner wall of flexible back bone, one end of spring is fixed on flexible back bone surface, arc elastic supporting plate is fixedly installed in the other end of spring, each arc elastic supporting plate its towards a connecting rope, the other end of connecting rope is fixedly connected in the middle part of flexible back bone ring inner wall stretch out silicone tube after passing through flexible back bone, ignition lead, enameled wire and silicone tube.The present invention can be conveniently adjusted wire center axis centering by mark rope with a scale, and ingenious in design but structure is simple.
Description
Technical field
The present invention relates to a kind of high-precision rogowski coils.
Background technique
With the development of the social economy, main energy sources of the electric energy as modern society, life and production and construction with the people
Relationship it is further close.Along with the rapid development of super-pressure and extra-high voltage electric transmission and transformation technology, power equipment capacity and quantity are big
Width increases, and power network scale gradually expands.While operating in guarantee qualification power supply quality of modern power systems, will also guarantee
Reliable and stable hair power supply capacity.Power transformer is one of most important equipment in electric system, improves power transformer
Operational reliability is particularly important.Transformer fault can timely be found by monitoring on-line to transformer, carry out accident
Early warning greatly improves the reliability of power transformer to avoid major accident, can also mention to overhaul after transformer fault
For main reference information, the cost of overhaul is saved, is of great significance for entire power industry.Rogowski coil application and
Raw, Rogowski coil itself is unlikely to be complete ideal device, can all cause certain phase by manufacturing process, mounting means etc.
Position error.Another critically important reason is can not to make the central axis of the central axis and Rogowski coil of measured conductor very
It is overlapped well, this is a major reason for causing precision inaccurate；Current raising accurate fashion has: uniformly wiring increases paint
Envelope curve around line density, add loop line circle etc.；Uniformly wiring and increase enameled wire can be for interfering magnetic in parallel around line density
Play the role of good inhibiting effect play mention it is high-precision；Add loop line circle can for axial interference magnetic field (because
Rogowski coil is in terms of axial direction, even if coil is fine and close again, an also only circle coil, as long as therefore existing around coil parallel
In the current loop of coil plane, the axial magnetic field generated will generate induced electromotive force at coil both ends, influence coil
Measurement accuracy) good inhibiting effect is played to play raising precision；Currently in order to guaranteeing wire center axis and Rogowski coil
Central axis coincidence is often realized in such a way that Rogowski coil ring internal diameter is substantially equal to wire diameter, but can only be directed to so same
The measurement of the conducting wire of one diameter.
The patent of Publication No. CN 101625377A: a kind of high-accuracy open type Rogowski coil, it includes at least one layer
Pcb board, the board group that every layer of pcb board is oppositely arranged by two at；Spacing is equipped between two plates, the end opening of two plates is normally opened
Opening；The pcb board is equipped with coil, and coil is led by the conducting wire that is engraved on pcb board top and bottom and connection top and bottom conducting wire
Terminal is constituted；Signal output end is equipped in the normally opened opening；The coil of two plates is connected in series by connecting line.Wood invention with
Traditional open type Rogowski coil is compared, and has the features such as small in size, light-weight, to be easily installed carrying.And pass through uniform cloth
Mutual interference is eliminated in the measures such as line, loop line arrangement, and precision can achieve 0.05 grade.It is effectively eliminated perpendicular to coil
The influence in plane external interference magnetic field, plate hollow coil uses this effective " loop line " measure of mirror-image arrangement, maximum
The potential impact of external magnetic field is eliminated to degree, but still not can solve wire center axis and Rogowski coil central axis not
The problem of coincidence.Authorization Notice No. is a kind of patent of CN 207947157U: high-precision PCB Rogowski coil containing alignment coil,
On a printed circuit, it under, controls, four azimuthal symmetries four compensative windings of installation, the compensative winding constitutes alignment coil.
Four compensative windings of alignment coil are vertical and are uniformly distributed in four positions up and down of printed circuit board, are to be printed on
Copper wire device on circuit board.The compensative winding and substrate vertical symmetry, compensative winding are applied directly to print by circuit diagram
On circuit board.The compensative winding is spiral-shaped.The printed circuit board is double-layer printing circuit board, and every layer printed circuit is all
It is evenly arranged coil, every layer of coil is connected by via hole.The Rogowski coil includes wire-retracting device, and the wire-retracting device includes
Coil rack, a circle of going for a stroll on coil rack are reversely enclosed around one again.Measuring device of the present invention in original PCB Rogowski coil
On the basis of add an alignment coil, the influence of conductor bias can be made to be minimized, thus increase measure electric current when essence
Exactness.It is played by way of two pairs up and down totally four bucking coil settings ensures conductor center axis thereof and Roche line
The central axis of circle is overlapped well, but makes adjustment process long in this way, inconvenient.
Summary of the invention
It is an object of the present invention to overcome defect existing in the prior art, a kind of high-precision rogowski coil is provided, it can be just
In adjustment wire center axis centering, ingenious in design but structure is simple, adjusts also easy and convenient；In location error and precision all
It improves very much, practicability is also very strong, and the relatively common Rogowski coil of the complexity of structure is also without increasing too big technique stream
Journey, but will be the breakthrough of a matter in terms of power measurement, it escorts for electric system.
To achieve the above object, the technical scheme is to design a kind of high-precision rogowski coils, including from the inside to the outside
The ring bodies that ignition lead, enameled wire and the silicone tube set gradually is constituted, enameled wire are wound around on ignition lead, ignition lead and enamel-cover
The both ends of line are connected by connector, and setting bucking coil and lead-out wire in connector, one end of bucking coil are connected with enameled wire, are another
One end is connected with lead-out wire；Flexible back bone is set on the inside of ignition lead its ring-type, its ring inner wall of flexible back bone be fixedly installed four with
The spring of Rogowski coil center circular array arrangement, one end of spring are fixed on flexible back bone surface, and the other end of spring is solid
Arc elastic supporting plate is set surely, each arc elastic supporting plate its towards being fixedly connected with a connection in the middle part of flexible back bone ring inner wall
Rope, the other end of connecting rope stretch out silicone tube after passing through flexible back bone, ignition lead, enameled wire and silicone tube.Using Roche line
As long as conducting wire is centering when circle, the extension elongation of four connecting ropes be it is equal, this makes it possible to can be directed to different-diameter
Conducting wire its electric current measurement and can guarantee that wire center axis is overlapped with Rogowski coil central axis, avoid phase error,
Greatly improve measurement accuracy.It is skillfully constructed but structure is simple and adjustment is easy.
Further technical solution is, the equal length of the four connecting ropes and part for stretching out silicone tube is equipped with mark
Layer, the through-hole that setting connecting rope passes through on flexible back bone, ignition lead, enameled wire and silicone tube.It so only need to be according to label layer (mark
The extension elongation of connecting rope can clearly be shown by knowing setting scale on layer) on number just can know that the extension elongation of connecting rope is
It is no equal, then illustrate that wire center axis is overlapped with Rogowski coil central axis if equal, avoids phase error, greatly
Improve measurement accuracy.The setting of perforation be in order to guarantee that its flexible path length of every connecting rope is identical, and protect
It has demonstrate,proved its adjustment of the setting of this connecting rope and display process is more accurate.
Further technical solution is the elastic sliver of its ring inner wall of flexible back bone two semicirculars of fixed setting, two
Four connecting rope guide sleeves arranged with Rogowski coil center circular array are set altogether in elastic sliver, connecting rope guide sleeve
One end is fixed on the ring inner wall of flexible back bone, and the height of connecting rope guide sleeve and the thickness of elastic sliver match, even
In a tubular form, there are two the through-hole is set, the circular arc channel of connecting rope is arranged in splicing guide sleeve between two through-holes, connecting rope it is logical
Avoid ignition lead and enameled wire setting in road.On the one hand the setting in circular arc channel avoids connecting rope every connection when with telescopic spring
The process path length difference of rope leads to error, connecting rope scraping collision on the other hand can also be avoided to ignition lead, enameled wire etc. and
Lead to the failure or damage of Rogowski coil.
The present invention also provides technical solution be: high-precision rogowski coil, including set gradually from the inside to the outside ignition lead,
The ring bodies that enameled wire and silicone tube are constituted, enameled wire are wound around on ignition lead, and the both ends of ignition lead and enameled wire pass through connector
Connection, setting bucking coil and lead-out wire in connector, one end of bucking coil is connected with enameled wire, the other end and lead-out wire phase
Even；Flexible back bone is set on the inside of its ring-type of ignition lead, its ring inner wall of flexible back bone is fixedly installed four and is in Rogowski coil center
The spring of annular array arrangement, one end of spring are connected to flexible back bone surface, and the other end of spring connects hard conductor fixture block,
Its company that setting is adapted to connection structure in one end of flexible back bone setting connection structure, flexible back bone of hard conductor fixture block
Connect hole.The setting of hard conductor fixture block can guarantee that the conducting wire clipped must be the central axis centering with Rogowski coil, no
Crossing this mode is exactly the conducting wire that can only be directed to same diameter, and hard conductor fixture block and flexible back bone are a void when unmeasured
The state of connection, and hard conductor fixture block is then fixedly connected on flexible back bone after entering in the middle part of Rogowski coil by conducting wire in measurement
On, it is easily installed measurement, design concept is preferable.
Further technical solution is that rubber sheet gasket, rubber is arranged in its one end far from flexible back bone of hard conductor fixture block
Pressure sensor is set in gasket.It may further ensure that the accuracy of centering in this way, as long as the numerical value of four pressure sensors
It is identical just to illustrate that wire center axis is overlapped with Rogowski coil central axis, phase error is avoided, measurement is greatly improved
Precision.
Further technical solution is that connection structure is the wedge-shaped card being extended to the outside of hard conductor fixture block end
Plate, the shape of the connecting hole are adapted with wedge-shaped snap-gauge；One end of the spring is fixedly connected on flexible back bone surface, spring
The other end be fixedly connected with hard conductor fixture block.By the clamping form of wedge-shaped snap-gauge and connecting hole realize hard conductor fixture block with
The connection of flexible back bone.Rogowski coil is hinged on skeleton both ends (by making sieve by way of rotating one section when in measurement
Family name's coil formed opening measured conductor is placed in behind Rogowski coil center closes again) mode be conventional technical means in the art,
This will not be repeated here.
Further technical solution is that connection structure is the external screw thread that hard conductor fixture block end is arranged in, the connection
The threaded hole of Kong Weiyu external screw thread adaptation；One end of the spring is rotatably connected on flexible back bone surface, and the other end of spring turns
It is dynamic to be connected on hard conductor fixture block, circular hole is set on flexible back bone surface and hard conductor fixture block, and the both ends of spring are solid respectively
Disk is set surely, and two disks are located in the circular hole of flexible back bone and in the circular hole of hard conductor fixture block.Connected by screw thread
The mode connect realizes that the connection of hard conductor fixture block and flexible back bone, the setting of spring pivotal connection then avoid spring from leading in hardness
Line card block tightens solid clock spring and is driven and twists so that spring failure or the decline of the service life of spring.
The advantages and beneficial effects of the present invention are: wire center axis pair can be conveniently adjusted by mark rope with a scale
In, ingenious in design but structure is simple；It adjusts also easy and convenient；Very much, practicability is all improved in location error and precision
It is very strong, the also process flow too big without increase of the relatively common Rogowski coil of the complexity of structure, but in power measurement side
Face will be the breakthrough of a matter, escort for electric system.As long as conducting wire is in four when using Rogowski coil
The extension elongation of root connecting rope be it is equal, this makes it possible to can for its electric current of the conducting wire of different-diameter measurement and can guarantee
Wire center axis is overlapped with Rogowski coil central axis, avoids phase error, greatly improves measurement accuracy.Design is skilful
Wonderful but structure is simple and adjustment is easy.Only need to according to label layer (in label layer be arranged scale can clearly show stretching for connecting rope
Length out) on number just can know that whether the extension elongation of connecting rope equal, then illustrate if equal wire center axis with
Rogowski coil central axis is overlapped, and is avoided phase error, is greatly improved measurement accuracy.The setting of perforation is to guarantee
Every connecting rope its flexible path length is identical, and ensure that its adjustment of the setting of this connecting rope and display process more
Accurately.On the one hand the setting in circular arc channel avoids the process path length of connecting rope every connecting rope when with telescopic spring different
Lead to error, on the other hand can also avoid connecting rope scraping collision cause to ignition lead, enameled wire etc. Rogowski coil failure or
Damage.The setting of hard conductor fixture block can guarantee that the conducting wire clipped must be the central axis centering with Rogowski coil, no
Crossing this mode is exactly the conducting wire that can only be directed to same diameter, and hard conductor fixture block and flexible back bone are a void when unmeasured
The state of connection, and hard conductor fixture block is then fixedly connected on flexible back bone after entering in the middle part of Rogowski coil by conducting wire in measurement
On, it is easily installed measurement, design concept is preferable.The mode being connected through a screw thread realizes the company of hard conductor fixture block and flexible back bone
It connects, and the setting of spring pivotal connection then avoids spring from tightening solid clock spring in hard conductor fixture block and be driven twisting so that bullet
Spring failure or the decline of the service life of spring.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of high-precision rogowski coil embodiment one of the present invention；
Fig. 2 is the hierarchical chart after Fig. 1 is unfolded from joint；
Fig. 3 is flexible back bone and its schematic diagram of inside in Fig. 1；
Fig. 4 is that Fig. 3 increases the schematic diagram after connecting rope guide sleeve；
Fig. 5 is the bottom view of flexible back bone in Fig. 4；
Fig. 6 is the schematic diagram of the embodiment of the present invention two；
Fig. 7 is the enlarged schematic partial view of Fig. 6.
In figure: 1, ignition lead；2, enameled wire；3, silicone tube；4, bucking coil；5, lead-out wire；6, connector；7, flexible bone
Frame；8, spring；9, arc elastic supporting plate；10, connecting rope；11, label layer；12, elastic sliver；13, connecting rope guide sleeve；14,
Circular arc channel；15, hard conductor fixture block；16, rubber sheet gasket；17, pressure sensor；18, disk.
Specific embodiment
With reference to the accompanying drawings and examples, further description of the specific embodiments of the present invention.Following embodiment is only
For clearly illustrating technical solution of the present invention, and not intended to limit the protection scope of the present invention.
Embodiment one:
As shown in Figures 1 to 5 (for convenient for diagram, connecting rope guide sleeve is not shown in Fig. 3), the present invention is a kind of high-precision sieve
Family name's coil, the ring bodies that ignition lead 1, enameled wire 2 and silicone tube 3 including setting gradually from the inside to the outside are constituted, 2 winding of enameled wire
On ignition lead 1, the both ends of ignition lead 1, enameled wire 2 and silicone tube 3 are connected by connector 6, and bucking coil 4 is arranged in connector 6
And lead-out wire 5, one end of bucking coil 4 is connected with enameled wire 2, the other end is connected with lead-out wire 5；On the inside of its ring-type of ignition lead 1
Flexible back bone 7 is set, and four springs arranged with Rogowski coil center circular array are fixedly installed in its ring inner wall of flexible back bone 7
8, one end of spring 8 is fixed on 7 surface of flexible back bone, and arc elastic supporting plate 9, each arc is fixedly installed in the other end of spring 8
Spring bed 9 its towards a connecting rope 10 is fixedly connected in the middle part of 7 ring inner wall of flexible back bone, the other end of connecting rope 10 is worn
Silicone tube 3 is stretched out after crossing flexible back bone 7, ignition lead 1, enameled wire 2 and silicone tube 3.It the equal length of four connecting ropes 10 and stretches
The part of silicone tube 3 is equipped with label layer 11 out, and connecting rope is arranged on flexible back bone 7, ignition lead 1, enameled wire 2 and silicone tube 3
10 through-holes passed through.Its ring inner wall of flexible back bone 7 is fixedly installed the elastic sliver 12 of two semicirculars, in two elastic slivers 12
Four connecting rope guide sleeves 13 arranged with Rogowski coil center circular array are set altogether, and one end of connecting rope guide sleeve 13 is solid
It is arranged on the ring inner wall of flexible back bone 7 calmly, the height of connecting rope guide sleeve 13 and the thickness of elastic sliver 12 match, and connect
Guide sleeve 13 restrict in a tubular form, there are two the through-hole is set, the circular arc channel 14 of connecting rope 10, connection are set between two through-holes
Ignition lead 1 is avoided in the circular arc channel 14 of rope 10 and enameled wire 2 is arranged.
Embodiment two:
It is with the difference of embodiment one, as shown in Figure 6, Figure 7, its ring inner wall of flexible back bone 7 is fixedly installed four with sieve
The spring 8 of family name's hub of a spool circular array arrangement, one end of spring 8 is connected to 7 surface of flexible back bone, the other end of spring 8
Connect hard conductor fixture block 15, hard conductor fixture block 15 its close to flexible back bone 7 one end be arranged connection structure, flexible back bone 7
It is upper that the connecting hole being adapted to connection structure is set.Rubber sheet gasket is arranged in its one end far from flexible back bone 7 of hard conductor fixture block 15
16, rubber sheet gasket 16 is interior to be arranged pressure sensor 17.Connection structure is the external screw thread that 15 end of hard conductor fixture block is arranged in, institute
Stating connecting hole is the threaded hole being adapted to external screw thread；One end of the spring 8 is rotatably connected on 7 surface of flexible back bone, spring 8
The other end is rotatably connected on hard conductor fixture block 15, and circular hole, spring is arranged on 7 surface of flexible back bone and hard conductor fixture block 15
Disk 18 is fixedly installed in 8 both ends respectively, and two disks 18 are located in the circular hole of flexible back bone 7 and hard conductor fixture block 15
Circular hole in.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvements and modifications can also be made, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (7)
1. high-precision rogowski coil, which is characterized in that including the ignition lead, enameled wire and silicone tube structure set gradually from the inside to the outside
At ring bodies, enameled wire is wound around on ignition lead, and the both ends of ignition lead and enameled wire pass through connector and connect, and setting is mended in connector
Coil and lead-out wire are repaid, one end of bucking coil is connected with enameled wire, the other end is connected with lead-out wire；On the inside of its ring-type of ignition lead
Flexible back bone is set, four springs arranged with Rogowski coil center circular array are fixedly installed in its ring inner wall of flexible back bone,
One end of spring is fixed on flexible back bone surface, and arc elastic supporting plate, each arc elastic support is fixedly installed in the other end of spring
Plate its towards a connecting rope, the other end of connecting rope is fixedly connected in the middle part of flexible back bone ring inner wall pass through flexible back bone, point
Silicone tube is stretched out after firewire, enameled wire and silicone tube.
2. high-precision rogowski coil according to claim 1, which is characterized in that the equal lengths of four connecting ropes and stretching
The part of silicone tube is equipped with label layer, and setting connecting rope passes through logical on flexible back bone, ignition lead, enameled wire and silicone tube
Hole.
3. high-precision rogowski coil according to claim 2, which is characterized in that the fixation of its ring inner wall of the flexible back bone is set
The elastic sliver of two semicirculars is set, four are arranged in two elastic slivers altogether with Rogowski coil center circular array arrangement
Connecting rope guide sleeve, one end of connecting rope guide sleeve are fixed on the ring inner wall of flexible back bone, the height of connecting rope guide sleeve
The thickness of degree and elasticity sliver matches, and connecting rope guide sleeve in a tubular form, there are two the through-hole is set, is arranged between two through-holes
Ignition lead and enameled wire setting are avoided in the circular arc channel of connecting rope, the channel of connecting rope.
4. high-precision rogowski coil, which is characterized in that including the ignition lead, enameled wire and silicone tube structure set gradually from the inside to the outside
At ring bodies, enameled wire is wound around on ignition lead, and the both ends of ignition lead and enameled wire pass through connector and connect, and setting is mended in connector
Coil and lead-out wire are repaid, one end of bucking coil is connected with enameled wire, the other end is connected with lead-out wire；On the inside of its ring-type of ignition lead
Flexible back bone is set, four springs arranged with Rogowski coil center circular array are fixedly installed in its ring inner wall of flexible back bone,
One end of spring is connected to flexible back bone surface, and the other end of spring connects hard conductor fixture block, its is close for hard conductor fixture block
Connection structure is arranged in one end of flexible back bone, and the connecting hole being adapted to connection structure is arranged on flexible back bone.
5. high-precision rogowski coil according to claim 4, which is characterized in that its separate flexibility of the hard conductor fixture block
Rubber sheet gasket is arranged in one end of skeleton, and pressure sensor is arranged in rubber sheet gasket.
6. high-precision rogowski coil according to claim 5, which is characterized in that the connection structure is to hard conductor card
Extended wedge-shaped snap-gauge outside block end, the shape of the connecting hole are adapted with wedge-shaped snap-gauge；One end of the spring
It is fixedly connected on flexible back bone surface, the other end of spring is fixedly connected with hard conductor fixture block.
7. high-precision rogowski coil according to claim 5, which is characterized in that the connection structure is that setting is led in hardness
The external screw thread of line card block end, the connecting hole are the threaded hole being adapted to external screw thread；One end of the spring is rotatably connected on
Flexible back bone surface, the other end of spring are rotatably connected on hard conductor fixture block, flexible back bone surface and hard conductor fixture block
Disk is fixedly installed in upper setting circular hole, the both ends of spring respectively, and two disks are located in the circular hole of flexible back bone and hardness
In the circular hole of conducting wire fixture block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811441616.7A CN109613317A (en) | 2018-11-29 | 2018-11-29 | High-precision rogowski coil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811441616.7A CN109613317A (en) | 2018-11-29 | 2018-11-29 | High-precision rogowski coil |
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| CN109613317A true CN109613317A (en) | 2019-04-12 |
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| CN201811441616.7A Pending CN109613317A (en) | 2018-11-29 | 2018-11-29 | High-precision rogowski coil |
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| WO2022018326A1 (en) * | 2020-07-21 | 2022-01-27 | Safegrid Oy | Apparatus and tool for a measurement coil |
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