EP2806432A1 - Insulation body for providing electrical insulation of a conductor and an electrical device comprising such insulation body - Google Patents

Insulation body for providing electrical insulation of a conductor and an electrical device comprising such insulation body Download PDF

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Publication number
EP2806432A1
EP2806432A1 EP13168861.6A EP13168861A EP2806432A1 EP 2806432 A1 EP2806432 A1 EP 2806432A1 EP 13168861 A EP13168861 A EP 13168861A EP 2806432 A1 EP2806432 A1 EP 2806432A1
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EP
European Patent Office
Prior art keywords
insulation body
modules
permittivity
module
layer
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.)
Withdrawn
Application number
EP13168861.6A
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German (de)
English (en)
French (fr)
Inventor
Roger Hedlund
Nils Lavesson
Harald Martini
Joachim Schiessling
Peter Sidenvall
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Technology AG
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ABB Technology AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ABB Technology AG filed Critical ABB Technology AG
Priority to EP13168861.6A priority Critical patent/EP2806432A1/en
Priority to CN201480029744.4A priority patent/CN105612592B/zh
Priority to PCT/EP2014/056676 priority patent/WO2014187605A1/en
Priority to EP14714731.8A priority patent/EP3000115B1/en
Publication of EP2806432A1 publication Critical patent/EP2806432A1/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/26—Lead-in insulators; Lead-through insulators

Definitions

  • the present invention relates to the field of power transmission technology, and in particular to insulation bodies for providing electrical insulation of a conductor in an electrical device such as a bushing, instrument transformer or cable termination.
  • Electrical bushings are used for carrying current through a plane which is at a different potential than the current path.
  • Bushings are designed to electrically insulate a conductor, located inside the bushing, from such plane.
  • the plane through which the conductor extends is often referred to as the grounded plane, even though the plane does not need to be grounded - in some applications, the plane is at potential further from ground potential than the conductor.
  • the grounded plane can for example be a transformer tank or a wall.
  • a bushing In order to obtain a smoothening of the electrical potential distribution between the conductor and the grounded plane, a bushing often comprises an insulation body around the conductor.
  • the insulation body comprises a number of coaxial foils made of a conducting material, where the foils are at a floating potential and separated by a dielectric spacing material.
  • Such insulation body is often referred to as a condenser core.
  • the dielectric spacing material could for example be oil impregnated or resin impregnated paper.
  • An example of a condenser core comprising coaxial conducting foils which are separated by a dielectric spacing material is for example described in WO2008/74166 .
  • a condenser core comprising floating-potential coaxial foils in a dielectric spacing material not only provides electrical insulation between the conductor and the grounded plane, but can also provide a desired field grading in a satisfying manner.
  • the production of such condenser cores is typically cumbersome and time consuming.
  • condenser cores which are easier to manufacture, and yet provide sufficient field grading, are desired.
  • An object of the present invention is to provide an alternative design of an insulation body for providing field grading and insulation of a conductor in an electrical device.
  • One embodiment provides an insulation body for providing electrical insulation of a conductor in an electrical device.
  • the insulation body comprises at least two modules, where each module has a hole through which the conductor may extend and each module comprises at least one insulating material.
  • the at least two modules are arranged so that the holes of the at least two modules form a passage through the insulation body, and adjacent modules are arranged firmly against each other.
  • the relative permittivity of the insulation body varies in the axial and/or the radial direction of the insulation body.
  • the modules could, if desired, be pre-fabricated, and the pre-fabricated modules could be assembled to form the insulation body.
  • the modules could for example be molded one on top of the other in order to obtain the desired insulation body.
  • At least one of the at least two modules comprises at least two layers of different materials having different relative permittivity, so that the relative permittivity of at least one module varies in the radial direction of the module.
  • the layers of the modules could for example be arranged so that the innermost layer of each module is formed from the material of the module which has the lowest relative permittivity.
  • the highest relative permittivity of the material(s) of a first of said at least two modules is higher than the highest relative permittivity of the material(s) of a second of said at least two modules, so that the relative permittivity of the insulation body varies in the axial direction of the insulation body.
  • Such permittivity variation serves to gradually allow the equipotential lines to deviate from the direction of the insulation body axis, thus providing grading of the electric field around the insulation body.
  • the variation in permittivity along the axial direction of the insulation body can for example be such that the ratio of the highest permittivity to the lowest permittivity is larger than 3. This ratio will often be higher than 3, for example 5, 10, 20, 30, 50 or even higher.
  • the module having the highest relative permittivity is located at a position such that, when the isolation body forms part of an electric device and the electric device is in use, a side of said module is in physical contact with the high stress part of the device, the high stress part being for example a flange, a grounded cable shield or a metering-core cabinet.
  • the modules could for example be arranged such that the highest relative permittivity of each of the at least one modules is lower than, or equal to, the highest relative permittivity of all of the other modules which are located closer to such high stress part.
  • the insulation body comprises an inner aggregate layer and an outer aggregate layer, where an aggregate layer is formed from a sequence of overlapping layers in adjacent modules.
  • the overlapping layers overlap in the radial direction, and an aggregate layer extends through the entire insulation body.
  • the relative permittivity differs between the inner and outer aggregate layers at at least one location along the axis of the insulation body.
  • the modules could for example be arranged so that the highest permittivity of the inner aggregate layer is lower than, or equal to, the lowest permittivity of the outer aggregate layer. This arrangement allows for an efficient field grading in that the outer aggregate layer of higher permittivity will guide the equipotential lines of the electric field, in the inner aggregate layer.
  • the inner and the outer aggregate layers are formed from insulating materials having an electric conductivity lower than 1 ⁇ S/m.
  • At least one module includes a material having a conductivity which exceeds 1 ⁇ S/m.
  • Such conductive materials can be efficiently contribute to the grading of the field, for example in the vicinity of areas of high field exposure such as bushing flanges.
  • a majority of the modules includes at least one conductive layer formed from a conducting material; and the modules in said majority are arranged next to each other in a sequence, so that a sequence of modules comprising conductive layers is formed. Such a sequence could act in a similar manner as conductive foils of a condenser core.
  • the invention also relates to a kit of parts for an insulation body for providing electrical insulation to a conductor.
  • the kit of parts comprises at least two modules, each module having a hole through which the conductor may extend and each comprising at least one insulating material.
  • the relative permittivity of the materials forming said at least two modules varies in a manner so that the relative permittivity of an insulation body, formed from said kit of parts, will vary in the axial and/or the radial direction of the insulation body.
  • Fig. 1 schematically illustrates a prior art bushing 100 which comprises an elongate insulating housing 105 through which a conductor 110 extends. At each end of the conductor 110 is provided an electrical terminal for connecting the conductor 110 to electrical systems or devices. The ends of the bushing are referred to as connection ends 113.
  • Bushing 100 of Fig. 1 furthermore comprises a condenser core 115.
  • the condenser core 115 of Fig. 1 comprises a number of conducting foils 120 which are separated by a dielectric spacing medium 123.
  • the dielectric spacing medium 123 is typically made of an insulating material, such as oil- or resin impregnated paper.
  • the bushing of Fig. 1 further comprises a flange 125 which is attached to the insulator 105.
  • the flange 125 can be used for connecting the bushing 100 to a plane 130 through which the conductor 110 is to extend.
  • the plane 130 is connected to the outermost conductive foil 120 via a connection 135.
  • Plane 130 may be connected to ground, or can have a potential which differs from ground. However, for ease of description, the term grounded plane will be used when referring to the plane 130.
  • the conductive foils 120 serve to capacitively grade the electric field within the bushing 100, and the condenser core 115 acts as a voltage divider which distributes the field within the condenser core 115.
  • a condenser core 115 having conducting foils 120 which are separated by a dielectric spacing medium 123 is typically cumbersome and time consuming.
  • the conductive foils 120 and thin sheets of the dielectric spacing medium 123 are wound to form the condenser core 115.
  • the condenser core is typically immersed in a bath of oil or epoxy. When epoxy is used, the epoxy will have to be cured. This post-winding processing of the condenser core in the form of drying/- impregnation/curing often takes several days.
  • an insulation body for providing electrical insulation of a conductor in an electrical device is provided.
  • the insulation body is formed from at least two modules, each having a hole through which the conductor may extend, and each comprising at least one insulating material.
  • the at least two modules are arranged firmly against each other in a manner so that the holes of the at least two modules form a passage for the conductor through the insulation body.
  • the relative permittivity of the insulation body varies in the axial and/or the radial direction of the insulation body.
  • the manufacturing of the insulation body can be much facilitated, and the production time can be considerably reduced.
  • the modules could, if desired, be pre-fabricated, and the pre-fabricated modules could be assembled to form the insulation body. In this way, the production of insulating bodies would be considerably less time consuming than a condenser core which has been wound and impregnated as described above.
  • an insulation body could easily be customized. If desired, different pre-fabricated modules could be kept in stock, so that when an order for an insulation body is received, the insulation body could be assembled from modules already in stock. Alternatively, the modules could for example be molded one on top of the other in order to obtain the desired insulation body.
  • the highest relative permittivity of the material(s) of a first of said at least two modules is higher than the highest relative permittivity of the material(s) of a second of said at least two modules, so that the relative permittivity of the insulation body varies in the axial direction of the insulation body.
  • a module could e.g. be of cylindrical shape, or have the shape of a truncated cone, or other suitable shape.
  • a module could for example be shaped as a circular or elliptical right cylinder, or as a circular or elliptical truncated cone.
  • Fig. 2a and 2b illustrate a module 200 of right circular cylindrical shape.
  • Fig. 2a is view from a point along the cylinder axis
  • Fig. 2b is a view form a point along a line which is perpendicular to the cylinder axis.
  • a hole 205 extends through the module 200, the hole 205 being located at the centre of the cylinder and extending along the cylinder axis. The diameter of the hole 205 is denoted ⁇ .
  • the module 200 of Figs. 2a and 2b is formed from one layer 210 of an insulating material having a relative permittivity ⁇ r .
  • the thickness of the layer 210 is denoted d, while the length of the module is denoted L.
  • the two sides of the module 200 which are intersected by the hole 205 will be referred to as the sides 215, while the outer side will be referred to as the circumferential surface 220.
  • a module 200 is formed from two or more layers 210.
  • Fig. 4 is a cross sectional view along the axis of an example of an insulation body 400 comprising a set of n modules 200 of circular cylindrical shape, where each module is made up of m layers 210 of different materials.
  • the layers 210 of a module 200 are concentric with the hole 205.
  • the layer 210 which is closest to the hole 205 will hereinafter be referred to as the innermost layer, and the layer which is furthest away from the hole 205 will be referred to as the outermost layer.
  • modules 200 By use of modules 200 in the manufacturing of an insulation body 400, an insulation body having varying permittivity in the radial and/or the axial direction can be created. All layers 210 of all modules 200 can, in principle, be of different materials having different permittivity. Alternatively, some layers 210 of at least some modules 200 could be made from the same material, having the same permittivity.
  • the relative permittivity of the i th layer 210 in the j th module 200 can be denoted ⁇ i,j . This notation is used in Fig. 4 .
  • the number of modules 200 in an insulation body 400 is at least two, and the number of layers in each module 200 is at least one.
  • the thickness d of the layers 210 of a module 200 could vary depending on application, and the thickness of different layers in the same module 200 will often not be the same.
  • An aggregate layer 405 thus extends, in the axial direction, through the entire insulation body 400 (possibly at a varying distance from the conductor 110).
  • at least one layer 210 of a first module will have a permittivity which differs from all corresponding layers 210 of an adjacent module 200. In the embodiment of Fig. 4 , this can be described as ⁇ i,j ⁇ i,j+1 for at least one value of i and j.
  • the modules of an insulation body 400 can for example be selected so that for at least one aggregate layer 405, a corresponding layer 210 forming part of the module 200 which is closest to the area where the highest electric field is expected, is the corresponding layer 210 of the aggregate layer 405 which has the highest permittivity.
  • the module 200 including the material of highest permittivity could be located closest to the flange 125.
  • the layer 210 of a module 200 will either have a permittivity which is the same as a corresponding layer in the adjacent module 200 which is closer to the area where the highest electric field is expected, or have a permittivity which is lower than the permittivity of the corresponding layer in this adjacent module which has the highest permittivity.
  • this can be described as ⁇ i,1 ⁇ i,2 ⁇ i,3 ... ⁇ i,n , where the 1 st module is the module which is closest to the area of high electric field and the n th module 200 is the module 200 which is at the greatest distance from the area of high electric field, where i denotes the i th aggregate layer 405.
  • Such a variation in the permittivity between different modules 200 will here be referred to as an overall decreasing permittivity of an aggregate layer 405.
  • an overall decreasing permittivity of an aggregate layer 405. By selecting the modules 200 forming an insulation body 400 in a manner so that an overall decrease of the permittivity of an aggregate layer 405 is achieved, an efficient field grading in the axial direction of the insulation body 400 can be obtained.
  • the insulation body 400 could advantageously form part of an electric device for providing electrical insulation of a conductor as well as field grading around the conductor.
  • electric devices include bushings, instrument transformers and cable terminations.
  • Fig. 5 is a schematic cross sectional view of an example of an electrical device comprising an insulation body 400.
  • the example of Fig. 5 is an embodiment of a bushing 500 comprising an insulation body 400 and a flange 125 arranged to be connected to a grounded plane 130.
  • the flange 125 of Fig. 5 is a schematic flange only, and in an implementation, the shape of the flange 125 would typically be smoother in order to smoothen the electric field around the flange 125.
  • the axis of the bushing 500 coincides with the axis of the insulation body 400.
  • Fig. 5 only the part of bushing 500 which extends on one side of the grounded plane 130 is shown.
  • On the other side of the grounded plane 130 further modules 200 will be arranged to form a further part (not shown) of the insulation body 400.
  • the bushing 500 is symmetric around the grounded plane 130, so that the same number of modules 200 will be arranged on both sides of the grounded plane 130, the modules 200 on one side being a mirror image of the modules 200 on the other side.
  • the bushing 500 is asymmetric, so that the modules on one side differ from the modules on the other side of the grounded plane 130.
  • the flange 125 is arranged to be in physical contact with the circumferential surface 220 of a first module 200 1 . Furthermore, the flange 125 of Fig. 5 is in physical contact with the side 215 of the module(s) 200 2 which are adjacent to said first module 200 1 , where the module(s) adjacent to the flange 125 are of larger thickness than the module 200 1 of which the circumferential surface 220 is in physical contact with the flange 125. Hence, the adjacent module(s) 200 2 extend along the flange 125 in the radial direction.
  • Such adjacent module(s) 200 2 advantageously has at least two layers 210, of which the outer layer has a higher permittivity than the inner layer, so that the outer, higher-permittivity layer 210 limits the number of equipotential lines allowed to deviate from the axis into the radial direction of the bushing.
  • the first module 200 1 whose circumferential surface 220 is in physical contact with the flange 125, includes a single layer 210. In another embodiment, the first module 200 1 includes further layers 210. In one implementation, the first module 200 1 includes a conducting outer layer 210, to which the flange 125 will be arranged to be in electrical contact. Such conducting outer layer 210 can be seen as an extension of the flange 125.
  • adjacent module(s) 200 2 it would be advantageous to arrange the adjacent module(s) 200 2 such that an outer high-permittivity layer 210 extends beyond the conductive layer 210 in the radial direction, while the total thickness of adjacent module(s) 200 2 could, if desired, be the same as, or smaller, than the thickness of module 200 1 .
  • a module 200 of which a side 215 is in physical contact with the flange 125, or with a conductive layer 210 which extends the flange 215 into a first module 200 1 , could advantageously have an outer layer 210 and an inner layer 210 arranged so that the permittivity of the outer layer is higher than the permittivity of the inner layer.
  • Figs. 6a-6c results from simulations of the electric field surrounding a modular bushing 500 are shown.
  • a cross section of a part of the bushing is shown in each drawing, where the shown part is delimited by the central axis 600 and the grounded plane 130.
  • the electric field has been indicated in Figs. 6a-6c by means of equipotential lines 605.
  • the part of the modular bushing 500 for which simulations were made included six modules 200, which are denoted modules 200 1 ,...,200 6 .
  • the relative permittivity of the outer layers of modules 200 2 -200 5 varies, the outer layers 200 2 -200 5 , together with single layer module 200 6 , thus forming an aggregate layer 405 2 exhibiting a permittivity variation in the axial direction.
  • the single layer module 200 6 forms part of two aggregate layers 405.
  • the distance between the flange 125 and the connection end 113 of the bushing 500 was set to 600 mm, divided between 6 modules of length 100 mm.
  • the equipotential lines shown in Figs. 6a-6c illustrate the situation where a voltage of 50 kV was applied to the conductor 110, and the flange 125 was grounded. The difference between two adjacent equipotential lines is 1 kV.
  • the spatial variation of the permittivity of the bushing in Fig. 6 gives rise to an efficient grading of the electric field.
  • the equipotential lines follow the axis of the conductor 110, while the higher permittivities of the outer aggregate layer 405 2 grades the field so as to limit the number of the equipotential lines allowed to deviate from the axis into the radial direction of the bushing.
  • the high permittivity works by steering away part of the equipotential lines from the region near the flange 125, making the equipotential lines more evenly distributed when crossing the outer surface of the insulation body 400.
  • Fig. 7 results from the simulations are presented in an alternative way.
  • the tangential electric field, E tan at the outer surface of the insulation bodies 400 is plotted as a function of distance z from the grounded plane 130 for the simulation scenarios of Fig. 6a-c , as well as for a further scenario wherein the geometrical dimensions are the same as in Figs. 6a-6b and the highest permittivity of the outer aggregate layer is 30.
  • Such inner aggregate layer will here be referred to as low-permittivity inner layer 405 1 .
  • a low-permittivity inner layer 405 1 could for example form the innermost aggregate layer 405 of the insulation body 400.
  • the insulation bodies 400 of the bushings 500 of Figs. 6a-6c each has two aggregate layers, of which the outer aggregate layer has varying permittivity and the inner aggregate layer 405 1 has a homogenous permittivity which is equal to the permittivity at the connection end 113 of the outer aggregate layer 405 2 .
  • An outer layer having a varying permittivity, and for which the permittivity is higher than the permittivity of a low-permittivity inner layer 405 1 will here be referred to as a high-permittivity outer aggregate layer 405 2 of varying permittivity, or high-permittivity outer layer 405 2 for short.
  • a low-permittivity inner layer 405 1 and a high-permittivity outer layer 405 2 where the high-permittivity end is located close to an area of high electric field, the equipotential lines will be guided by the high-permittivity material to follow the low-permittivity inner layer 405 1 , away from the flange area.
  • the ratio of ⁇ r high to ⁇ r low often exceeds 3 for at least one aggregate layer, while in some implementations, this ratio may be as high as 20 or higher.
  • This permittivity ratio the more efficient will the achieved field grading be for an insulation body 400 of particular dimensions.
  • a low-permittivity inner layer 405 1 as well as a high-permittivity outer layer 405 2 of varying permittivity are included in the insulation body 400
  • the highest permittivity of the low-permittivity inner layer 405 1 can be denoted ⁇ r inner , high
  • the highest permittivity of the high-permittivity outer layer 405 2 can be denoted ⁇ r outer , high .
  • the ratio of ⁇ r outer , high to ⁇ r inner , high takes the values 5, 10 and 20.
  • the filler particle content in a composite material could for example be less than 50 vol%, and in many implementations, the filler particle content lies within the range of 15 vol% - 50 vol%. Particle sizes could for example lie within the range of 0.1 ⁇ m - 100 ⁇ m, and in many implementations, particle sizes within the range of 0.1-10 ⁇ m are used. However, materials of other filler particle contents and particle sizes can also be used.
  • an insulation body 400 could, if desired, also include materials of higher conductivity, such as metallic or semiconducting materials having a conductivity larger than 1 ⁇ S/m.
  • a module 200 could include a radial plate or sheet of a metallic material such as Al or Cu, or one or more modules 200 could have one or more layers 210 which is conducting.
  • a conducting layer 201 could for example be useful near the flange 125 of a bushing, implemented for example by a conducting layer in one, two, three or more modules.
  • a layer 910 runs from the protrusion 900 through the module 200 in the axial direction of the module 200, and the shift in radial location between different sets of corresponding protrusion/recess pairs results in an overlap in the axial direction of the layer 910 in one module with the layer 910 in an adjacent module 200.
  • overlapping layers 910 could be of a conducting material, and could for example be located near the flange 125, or forming a conducting stretch extending across the entire axial length of the insulation body 400.
  • one or more modules 200 include two or more overlapping layers 910 of conductive materials, in order to form conductive foils 120. A locking system with shifted protrusions could then be useful, so that the conductive layers of adjacent modules overlap.
  • a stretch of the insulation body wherein the electric properties are constant In order to achieve such stretch of a particular length, one module of the particular length could be used to form this stretch; or, two or more modules, the lengths L of which add up to the particular length, could be used.
  • a stretch of the insulation body 400 which has constant electric properties in the axial direction will here be referred to as a section.
  • a single module, or two or more adjacent modules 200 which have the same properties can be used to form a section of an insulation body 400.
  • the manufacturing of the modules 200 is performed such that the modules 200 are moulded one on top of the other, so that the production of the modules takes place at the same time as the production of the insulation body 400, and the bonding between different modules 200 is achieved upon production of the modules 200.
  • Molding techniques such as e.g. injection molding or Resin transfer molding (RTM) could be used.
  • the centre of the holes 205 of the different modules 200 are typically aligned. Furthermore, the diameter of the hole 205 is often the same for each module in the insulation body 400. The diameter ⁇ of the hole 205 will often correspond to the diameter of the conductor 105 which is to extend through the hole, so that a firm mechanical connection is achieved between the conductor 110 and the insulation body 400.
  • the connection between the conductor 110 and the insulation body 400 could, if desired, be enhanced by use of an adhesive substance such as epoxy, polyurethane or acrylic. By applying an adhesive substance between the conductor and the modules 200, improved mechanical stability can be achieved.
  • the diameter of the hole 205 will be larger than the diameter of the conductor 110, so that a space is created between the conductor 110 and the insulation body 400.
  • This space would for example be filled with transformer oil, SF6 gas, epoxy or any other suitable insulating substance.
  • mechanical stability could for example be achieved by bonding the modules 200 to each other, and mechanically fix the bonded modules to a bushing housing 105, or to the conductor 110 at selected locations.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Bodies (AREA)
  • Insulators (AREA)
EP13168861.6A 2013-05-23 2013-05-23 Insulation body for providing electrical insulation of a conductor and an electrical device comprising such insulation body Withdrawn EP2806432A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP13168861.6A EP2806432A1 (en) 2013-05-23 2013-05-23 Insulation body for providing electrical insulation of a conductor and an electrical device comprising such insulation body
CN201480029744.4A CN105612592B (zh) 2013-05-23 2014-04-03 用于提供导体电绝缘的绝缘体和包含这种绝缘体的电设备
PCT/EP2014/056676 WO2014187605A1 (en) 2013-05-23 2014-04-03 Insulation body for providing electrical insulation of a conductor and an electrical device comprising such insulation body
EP14714731.8A EP3000115B1 (en) 2013-05-23 2014-04-03 Insulation body for providing electrical insulation of a conductor and an electrical device comprising such insulation body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13168861.6A EP2806432A1 (en) 2013-05-23 2013-05-23 Insulation body for providing electrical insulation of a conductor and an electrical device comprising such insulation body

Publications (1)

Publication Number Publication Date
EP2806432A1 true EP2806432A1 (en) 2014-11-26

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EP13168861.6A Withdrawn EP2806432A1 (en) 2013-05-23 2013-05-23 Insulation body for providing electrical insulation of a conductor and an electrical device comprising such insulation body
EP14714731.8A Active EP3000115B1 (en) 2013-05-23 2014-04-03 Insulation body for providing electrical insulation of a conductor and an electrical device comprising such insulation body

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EP14714731.8A Active EP3000115B1 (en) 2013-05-23 2014-04-03 Insulation body for providing electrical insulation of a conductor and an electrical device comprising such insulation body

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CN (1) CN105612592B (zh)
WO (1) WO2014187605A1 (zh)

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US10799706B2 (en) * 2018-09-06 2020-10-13 NeuSpera Medical Inc. Garment for positioning midfield transmitter relative to implanted receiver

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EP3000115B1 (en) 2021-02-17

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