EP3075045A1

EP3075045A1 - Electrode arrangement

Info

Publication number: EP3075045A1
Application number: EP15700974.7A
Authority: EP
Inventors: Markus BIELETZKI; Peter Milewski; Wojciech Olszewski; Rico Rademacher; Christian Schön
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 2014-02-03
Filing date: 2015-01-09
Publication date: 2016-10-05
Also published as: WO2015113795A1; CN105934857A; DE102014201861A1; CN105934857B

Abstract

The invention relates to an electrode arrangement comprising a field-influencing electrode (3a, 3b, 3c, 3d, 3e, 3f). Said electrode (3a, 3b, 3c, 3d, 3e, 3f) has an electrode wall which has at least one opening (9).

Description

description

Electrode Arrangement The invention relates to an electrode arrangement comprising a field-influencing electrode with an electrode wall.

Such an electrode arrangement is known for example from the publication US 2011/0132632 AI. The local electrode arrangement has an electrode, which is designed annular. An electrode wall of the field-influencing electrode is formed by a solid wire. In the present case, the electrode is embedded in an insulating body. In addition to a shown embodiment of the electrode as a closed circular ring, an embodiment of the electrode is described as a section of a ring.

Due to the massive design of the electrode with an annular course there is a risk of a dimensional change of the electrode, especially when temperature fluctuations occur. Particularly in the case of the proposed embedding in an insulating body, gaps may form at the points of contact between the electrode and the insulating body because of different materials. Possible gap formations are suitable for adversely affecting the dielectric stability of the electrode arrangement.

Thus, it is an object of the invention to form an electrode arrangement of the type mentioned in the beginning, whose tendency to temperature-dependent dimensional changes is reduced.

According to the invention, the object is achieved in an electrode arrangement of the type mentioned at the outset in that the electrode wall has at least one opening. An electrode is a device which serves to control an electric field. By an electrode, a distribution of an electric field can be influenced. For example, due to the shape of the electrode, a homogenization of an electric field can take place. The electrode may for this purpose have a corresponding electrode wall, which has an electrode surface. The electrode wall determines the field-influencing behavior of the electrode. The electrode should be at least partially, in particular in the region of the electrode wall, electrically conductive. The electrode wall may comprise, for example, an electrically conductive material such as a metal. The electrode wall itself may be formed of a metal. However, the electrode wall can also be mixed with an electrically conductive material or, for example, an electrically conductive portion, for. As a coating. Positioned within an electric field, the electrode influences the course of the electric field. Thus, for example, it is possible to homogenize substantially inhomogeneous field distributions, which can lead to field strength peaks, for example, and to reduce field strength peaks. The electrode is arranged, for example, within an electrically insulating medium. This electrically insulating medium may be for example a fluid or a solid. The electrically insulating medium in turn has a lower, preferably a negligible influencing an electric field compared to the electrode. The medium can, for example, cover a breakthrough in the electrode or enforce this breakthrough. Also with one

Breakthrough remains the envelope contour of the electrode or the

Electrode wall of the electrode assembly obtained per se. As a rule, the regions of the electrode wall bounding the aperture have the same electrical potential, so that a field-free space is formed in the region of the aperture. Care should be taken that the breakthrough has only such a cross-section that the electrode wall limiting the breakthrough sufficient stabilization of the breakthrough in terms of field freedom guaranteed. For example, it is also possible for a plurality of openings to be arranged in the electrode wall. By using a breakthrough, the envelope contour of the electrode / electrode wall and thus its dielectrically active contour are retained. In the electrode, there are areas which have an increased elasticity, so that thermal expansion can be compensated in a simplified manner. The envelope contour can be maintained, for example, by a Strebwerk, while a plurality of breakthroughs lie between struts of the Strebwerkes. By using an electrode, which, for example, in the manner of a

Strebwerkes is formed, can compensate for thermally induced dimensional changes in the structure of the electrode itself and at the same time, the mass of the electrode, and thus the cost of materials for the formation of the electrode can be reduced. Advantageously, the electrode can be, for example, a metallic electrode, which is formed from a metal sheet or as a cast body, wherein an opening or a plurality of openings are arranged at suitable positions in the course of the electrode wall. Such electrode arrangements can be used, for example, in pressure-fluid-insulated electrical power transmission devices.

Druckfluidsolierte electric power transmission devices have at least one phase conductor, which is disposed within a capsule housing and are positioned relative to the encapsulating housing, for example, via a Isolierstoffkör- by spaced. The distance between the phase conductor and the encapsulating housing serves to electrically insulate the phase conductor. The electrical insulation can be embodied in this area, for example as pressure fluid insulation, for example, a compressed gas such as sulfur hexafluoride or nitrogen or carbon dioxide or other suitable gases or gas mixtures can be used. These substances can also occur in a liquid state. In particular, in the transition region between a fluid insulation and a solid insulation, which preferably the positioning and spacing of the phase conductor relative to the encapsulation housing, is a field influence of advantage. For example, an electrode may extend at least partially within a solid insulator arrangement which serves to position a phase conductor in the encapsulation housing.

Advantageously, it can be provided that the

Breakthrough with a material is at least partially covered, which deviates in comparison to the electrode wall an electric field.

By covering the breakthrough with one of the

Electrode deviating material, a mechanical protection or a mechanical stabilization of the breakthrough and thus also the breakthrough limiting electrode wall can be achieved. By way of example, the covering may be provided by means of a solid, wherein the solid has, for example, electrically insulating properties, whereas the electrode or the electrode wall has an increased dielectric conductivity (at least in field-influencing areas) compared to the insulating material. Preferably, the electrode can be formed in an electrically conductive or semiconducting manner, for example in the regions of the surface of the electrode wall, which serve to influence an electric field. Thus, it is conceivable, for example, that the electrode has a carrier body which, for example, has an electrically insulating effect and only surface regions of this carrier body are designed to be electrically conductive (for example by a coating). As the breakthrough at least partially overlapping material can be selected according to an insulating material, such as a solid insulation. As a solid insulation, for example, organic plastics or inorganic substances can be used. In particular insulating resins have proven to be advantageous, which have a good electrical insulation strength with strong mechanical resistance. In particular, when using many breakthroughs, which durchsetzt- the envelope contour of the electrode. zen, a stabilization of the electrode itself can be made by covering the breakthroughs. Thus, it is possible, for example, to form a low-mass electrode, which in turn has sufficient elasticity, as a result of which the susceptibility to thermal influences is reduced. The material which covers the breakthrough, for example, be designed as a composite material. For example, the material may comprise a mix of electrically conductive and electrically insulating components or else a mixture of different electrically insulating components.

The necessary stability can be ensured, for example, by the use of one or more apertures, at least partially covering the material. In this case, the material may, for example, be positively and / or positively and / or materially connected to the electrode, so that forces can be transmitted and transmitted within the electrode wall over an outbreak. The material should bridge a breakthrough.

A further advantageous embodiment can provide that the material is a dielectric. A dielectric is a weak or non-conductive material / material composition, such as an electrically insulating material. That is, the material has only a negligible dielectric influence of an electric field. In particular, in comparison with the dielectric activity (dielectric conductivity) of the electrode / electrode arrangement or the dielectrically active portions of the electrode (eg, a surface of the electrode wall), the material is almost negligible in terms of influencing an electric field. The material may be an electrically insulating material, for example a solid. However, it may also be a fluid, for example gaseous, in particular a viscous mass. By using a dielectrically inactive material as the field-influencing effect of the electrode can be ensured. The dielectric may be part of a capacitor arrangement, in particular a capacitive divider. Furthermore, it can be advantageously provided that the material passes through the opening and covers at least parts of the electrode wall.

Enforcement of the breakthrough with the material makes it possible to close the breakthrough and to represent an especially mechanically coupling bridge between the regions of the electrode wall, which limit the breakthrough. Furthermore, the shape of the breakthrough can be stabilized by penetration of the material into the aperture. This leads to an additional stiffening of the electrode arrangement in a reduced-mass reduced thermal expansion electrode. By interspersing or covering the electrode wall with the material, a form-fitting bond between the material and the electrode wall can be achieved, in which projecting shoulders can be traced behind or around, so that due to the self-adjusting shaping of the material, in particular in the case of an angle-stiff Material a force transfer between the material and the electrode wall is possible. Thus, in addition, a change in the extent of the electrode due to thermal effects is counteracted.

Advantageously, it can be provided that the electrode is at least partially, in particular completely embedded in the material.

Embedding the electrode in the material is particularly advantageous if the electrode is to be combined with other functional assemblies. For example, the electrode can be embedded in a solid-state insulator which, for example, serves to position a phase conductor of a pressure-fluid-insulated electrical energy transmission device. So, on the one hand, it is possible to Ren the phase conductor necessary to use solid insulator for receiving the electrode, whereby the electrode perceives a field-influencing effect in the region of a support between a phase conductor and an encapsulating. Advantageously, the electrode can thereby be completely embedded in the material so that access is only indirectly possible, for example corresponding holding or positioning means or contacting elements of the electrode can protrude from the material so that indirect access to the electrode is still possible is. However, it can also be provided that the electrode is only partially embedded, so that the electrode can also be a direct access and there is at least partially surrounded by a fluid insulating medium, for example. By at least partially embedding the electrode, a mechanical protection for the electrode can be formed.

A further advantageous embodiment may provide that the electrode wall has a grid structure.

By using a grid structure, an electrode wall can result with a multiplicity of openings, which are preferably arranged uniformly distributed in the electrode wall. Between the openings, an electrode wall can be maintained, which is formed, for example, substantially rod-shaped or strut-shaped. The shape of the openings in the electrode wall or the bar shape / strut shape can vary. For example, the lattice structure can be produced by using a fabric, wherein openings are arranged between individual "woven threads." A lattice structure can, for example, also ensue by braiding, soldering, welding, etc. A lattice structure can, for example, also be pierced by a perforation Sheet metal or a punching of a sheet can be effected

Use of a so-called expanded grid to be equipped with a grid structure. In this case, a plate (preferably a metallic sheet) is provided with a perforation. By stretching / plugging a breakthrough with increased cross-section is generated at the perforated locations. The individual bars between the breakthroughs tilt in the process. Such a stretched grid can preferably be shaped so that electrodes of various shapes can be formed. Regardless of the type of formation of the lattice structure, the electrode wall should preferably have an intrinsic stability, that is, the electrode wall is formed with a rigid angle (self-supporting).

An advantageous embodiment may provide that the

Electrode, in particular the electrode wall, at least partially formed substantially annular. An annular electrode or at least partially ring-shaped electrode has a dielectrically favorable shape per se, since projecting edges are avoided. Thus, it is possible, for example, to let an annular electrode pass through a phase conductor, so that an electric current emanating, for example, from the phase conductor

Field is homogenized. The phase conductor can thus pass through a ring opening of the electrode. Phase conductor and electrode may preferably be aligned coaxially. The outgoing from the phase conductor electric field can, for. B. by a charge of the phase conductor (for example, by an electrical voltage which is applied to conduct an electric current to the phase conductor) take place. By means of the electrode, for example within a isolation, a controlled reduction of the high electrical potential originating from the phase conductor can take place to the area surrounding the phase conductor. For example, it is possible to even out the dielectric stress of an insulating material (dielectric), for example within a post insulator. Thus, dielectric overstressing at certain points is avoided.

The electrode in its ring shape can be profiled in various ways. For example, it may be an annular Give electrode with (hollow) circular cross section. However, it can also be provided that the electrode has, for example, a U-shaped profiling, so that a groove-shaped receptacle is formed, which is arranged, for example, on the outer circumference. This groove-shaped receptacle can in turn be electrically conductively closed so that a substantially hollow electrode is formed. By a U-shaped profiling, the mass or the volume of the electrode can be reduced, so that the susceptibility to thermally induced changes in volume of the electrode can be reduced. In order to shield a receptacle / a recess of the electrode dielectrically, the electrode can also be constructed in several parts, for example, a groove can be closed by a groove cover, so that again a dielectrically shielded field-free space is formed within the electrode.

A further advantageous embodiment can provide that the electrode is equipped with a radially-forgoing retaining means.

For example, a radially-forgoing retaining means may support the electrode and position it, for example, spaced from the phase conductor relative to the encapsulating housing. By way of example, it is also possible to supply measuring leads or measuring sensors or similar devices to the electrode via the holding means. In particular, when embedding the electrode in a material, a positional fixing of the electrode, for example relative to a phase conductor, can take place during production and a defined relative position in the resulting potting body can be ensured after an encapsulation and subsequent curing of a material. By way of example, a potential tap of or a potential application of the electrode can also be effected via the radially-forgoing retaining means. For this purpose, the holding means can be designed to be at least partially electrically conductive, so that a transmission of an electrical potential of the electrode is possible. With a provision of a Floating potential this can be detected, for example, the holding means. However, a targeted grounding of the electrode can also be carried out via the holding means. Advantageously, the holding means should be arranged at a substantially annular electrode on the outer circumference of the electrode and carry radially from there. Thus, the holding means is preferably positioned outside a ring opening encompassed by a ring shape. When assigning an electrode to a phase conductor, the holding means should be connected to the electrode in a zone of the electrode facing away from the phase conductor.

A further advantageous embodiment can provide that a transition from the holding means to the electrode is arranged in a shielded section.

A transition from the holding means to the electrode should preferably be in a dielectrically shielded section of the

Electrode lie. The holding means and the electrode may be formed, for example, in one piece or also in several parts. In particular, in a multi-part design allows the shielding of the transition between the electrode and holding means a relatively free selection of the necessary fasteners or fastening methods to be used. For example, the holding means with the electrode potted, cohesively, or by gluing, soldering, non-positively, for example by screws or rivets or even form-fitting, for example, be connected by detents or locking lugs. The transition between the holding means and the electrode should be outside the central area of an annular electrode. Preferably, the transition should lie on the outer circumference of the electrode. There, for example, a recess z. B. may be arranged in the form of a groove into which the holding means dips and be secured there in the shielded area between the groove cheeks or on the groove bottom. A further advantageous embodiment may provide that the holding means protrudes at least partially from a sheathing of the electrode with the material. In particular, in the case of a jacket of the electrode, at least partially or completely, the retaining means should, at least in part, traverse the jacket, so that an indirect access to the electrode is provided via the retaining means. Thus, for example, there is the possibility to accomplish a Potentialbegriffung or a potential tap of the electrode outside of the material. Furthermore, the holding means can also serve to hold test leads and the like. For example, a channel may be provided to lead test leads or the like to the electrode. The holding means may have an interface, which is embedded, for example, flush in a surface of the sheath. Thus, the holding center may protrude from the material without affecting the contour of the electrode assembly.

A further advantageous embodiment can provide that the electrode is part of a capacitive voltage divider.

A phase conductor serves to guide an electric current, which in turn is driven by an electrical potential. As a rule, the electrical potential is different from the electrical potential of the surroundings of the phase conductor. In order to isolate the phase conductor from the environment, for example, fluid or solid insulating materials are used. By arranging an electrode, the field distribution or the reduction of the electrical voltage within the electrical insulation of the phase conductor can be influenced. For example, it is possible to use the electrode as part of a capacitor which has a certain capacity. Accordingly, there is a capacitive displacement current from the electrode, which is a measure of the voltage with which a phase conductor is acted upon. Thus, it is possible, for example, at least to provide qualitative, but in particular quantitative, statements about the electrical potential of a phase conductor. The electrode can serve to influence the field, but also serve as part of a capacitive voltage divider for detecting an electrical voltage.

A further advantageous embodiment can provide that the electrode has a dielectrically shielded receptacle for a measuring device.

For example, a receptacle for a measuring device can serve to position a probe or a sensor dielectrically shielded in the vicinity of a phase conductor in order to detect the state of the phase conductor. For example, by the measuring means, an electric current, a temperature or an electrical voltage, etc. are determined. Advantageously, however, the measuring means should serve to measure an electric current flow within the phase conductor. Thus, it is possible to use the electrode, on the one hand, for determining a voltage by use in a capacitive voltage divider and, on the other hand, to measure an electric current which flows in the voltage-charged phase conductor. Thus, a so-called combination measuring transducer can be formed, which determines current and voltage in / on a phase conductor. As a measuring means, for example, a Rogowski coil can be used, which is inserted for example in a phase conductor encompassing recording. In addition, however, other measuring equipment can be used. The recording can serve a shielding of the measuring means.

Furthermore, it can be advantageously provided that a transition from the holding means to the electrode is in the region of the receptacle.

The receptacle may extend radially around an annular electrode, for example, on the outer circumference, so that, for example, from different radial directions Access to the recording is possible. The recording can also be partially covered to improve the receiving space improved dielectrics. Advantageously, the transition from a holding means to the electrode can also be positioned in the receptacle. This offers the advantage that access to the recording with a measuring means to be positioned therein is possible, so that z. B. measuring lines of the measuring means can be passed from the electrode via the holding means. Thus, the holding means can serve to position the electrode itself. The holding means can also serve to position measuring leads or measuring means on the electrode.

In the following, an embodiment of the invention is schematically shown in a drawing and described in more detail below. It shows the

1 shows a frontal section through an electrode assembly, the

Figure 2 shows a cross section through an electrode, the

Figure 3 is a perspective view of an electrode in a first embodiment, the

Figure 4 is a perspective view of an electrode in a second embodiment, the

Figure 5 shows the second embodiment of an electrode with a holding means and a first fastening between holding means and electrode, the

Figure 6 shows the second embodiment of an electrode and a second fastening between a holding means and electrode, the

Figure 7 shows a variant of a recording of the second embodiment of the electrode, the 8 shows a cross section through a receptacle according to FIG. 7, FIG. 9 shows a third embodiment of an electrode with a holding means and FIG

10 shows a cross section through the third embodiment

created an electrode. In the

FIG. 11 shows a further embodiment of a shark by means of a combination with the second variant of an electrode. FIG. 1 shows a section through an electrode arrangement. In the present case, a substantially cylindrical insulating body 1 is shown in cross section. By way of example, the insulating material body 1 is essentially circular-cylindrical, with a plurality of phase conductors 2a, 2b, 2c being arranged in the direction of its cylinder axis, passing through the insulating body. The phase conductors 2a, 2b, 2c pass through the insulating body 1 in the direction of its cylinder axis, wherein the phase conductors 2a, 2b, 2c are preferably also made substantially cylindrical and whose cylinder axes are aligned parallel to the cylinder axis of the insulating material 1. The phase conductors 2 a, 2 b, 2 c pass through the insulating material body 1 completely, so that they can each be contacted on the face side with further phase conductor sections. The phase conductors 2a, 2b, 2c are arranged on a circular path lying coaxially with the cylinder axis of the insulating material body 1, the phase conductors 2a, 2b, 2c forming the vertices of an equilateral triangle. In addition to a circular cylindrical shape of the insulating material 1, it can also have other shapes (preferably rotationally symmetrical). For example, the insulating material may also be frustoconical, cup-shaped, tapered, etc. formed. The phase conductors 2a, 2b, 2c may differing forms, for. B. rotationally symmetrical shapes. Coaxially with each of the phase conductors 2a, 2b, 2c, an electrode 3a, 3b, 3c is arranged in each case. The electrodes 3a, 3b, 3c are completely embedded in the insulating body 1. Each of the electrodes 3a, 3b, 3c has a holding means 4a, 4b, 4c on its outer circumference. The holding means 4a, 4b, 4c are connected to the electrodes 3a, 3b, 3c, wherein on the holding means 4a, 4b, 4c in the lateral surface region of the insulating material 1 an indirect access to the electrodes 3a, 3b, 3c is created.

The electrode arrangement shown in FIG. 1 can be used, for example, as an insulator arrangement in a pressure fluid-insulated electrical energy transmission device. As such, the insulating body 1 can be integrated into a flange connection, which is arranged, for example, on mutually facing end faces of two pipe sockets of two encapsulating housings. In this case, the insulating body 1 can be encompassed on the shell side by a stabilizing frame. This frame can also be part of the flange connection. The insulating material body 1 may be a fluid-tight barrier of one or more encapsulation housings delimited by the pipe sockets and thereby serve for positioning the phase conductors 2a, 2b, 2c. The electrodes 3a, 3b, 3c can each form an electrode 3a, 3b, 3c of a capacitor as capacitive dividers, so that the electric field which surrounds each of the phase conductors 2a, 2b, 2c when subjected to voltage can be detected via the capacitive divider , Thus, it is possible to achieve, via the electrodes 3a, 3b, 3c, on the one hand a homogenization of an electric field surrounding the phase conductors 2a, 2b, 2c and thus to improve the dielectric stability of the insulating material body 1. On the other hand, the electrodes 3a, 3b, 3c themselves may be part of a (voltage) measuring device. About the holding means 4a, 4b, 4c, the electrodes 3a, 3b, 3c, for example by means of measuring line in a measuring system einbindbar. The lying in the sectional plane of Figure 1 electrodes 3a, 3b, 3c each have a receptacle which are formed in the manner of a on the outer circumference of the electrodes 3a, 3b, 3c in the radial direction opening groove. In each case, a measuring means 5a, 5b, 5c for measuring an electric current is inserted in these receptacles. For example, a measuring means 5a, 5b, 5c may be in the form of a Rogowski coil, with each measuring means 5a, 5b, 5c detecting a magnetic field emanating from an electric current passing through the respective phase conductors 2a, 2b, 2c and thus acquiring an image of the current flowing in the respective phase conductors 2a, 2b, 2c. Measuring lines for integrating the measuring means 5a, 5b, 5c can be guided via the associated holding means 4a, 4b, 4c to the respective receptacles of the electrodes 3a, 3b, 3c.

FIG. 2 shows by way of example a cross section through one of the electrodes 3a. The electrode 3 a is cut free from the insulating body 1. Evident is the embodiment of the electrode 3a in the form of a latticework, wherein the electrode itself is designed annular. The electrode is made of an electrically conductive material, such as a metal such as brass, aluminum, stainless steel or copper. The shaping of the electrode preferably takes place by forming an expanded lattice. Breakthroughs 9 in the electrode 3a are covered by the material of the insulating material 1 / covered and penetrated by the material. On its outer side, the electrode has a groove-shaped receptacle 6, which rotates closed in itself. The receptacle 6 is bounded by laterally encircling groove cheeks 7a, 7b, wherein the groove cheeks 7a, 7b have convergent curvatures at their free ends, so that the receptacle 6 itself is dielectrically shielded. The associated holding means 4a is connected centrally between the groove cheeks 7a, 7b in the receptacle 6 with the electrode 3a. On both sides of the

Holding means 4a 4a measuring means are arranged. The measuring means 5a are each formed as a Rogowski coil, so that two parallel arranged Rogowski coils 5a ring in the Receptacle 6 of the electrode 3a rotate. As a result, for example, a redundant measurement can be carried out by the measuring means 5a. In the present case, the measuring means 5a are designed as independently operating Rogowski coils, so that the phase conductor 2a, which passes through the ring opening of the electrode 3a, can be monitored for current flow. It can be provided that the measuring means 5a have different transmission characteristics, so that for example one of the measuring means 5a can be used for billing an electrical work, whereas the other measuring means 5a can be used for overcurrent protection purposes, for example. However, it can also be provided that the two measuring means 5a are designed only as redundant measuring means 5a. Furthermore, the holding means 4a is set up to guide measuring lines 8 to the measuring means 5a. Furthermore, it is possible to provide a connection of the electrode 3 a, so that, for example, a capacitive displacement current can be conducted to the outside starting from the electrode 3 and can be measured there. Thus, it is possible to use the electrode 3a as a capacitive divider. The electrode 3a is preferably constructed in the form of a grid. For example, an expanded metal can be used, which is shaped by appropriate shaping in a ring electrode, wherein on the outer circumference, the receptacle 6, for example by driving the electrode 3a, can be formed.

The electrode 3a shown in FIG. 2 as well as the further components stand by way of example for all of the electrodes 3a, 3b, 3c shown in FIG. 1 and further assemblies. In addition to the three-phase design variant shown in FIG. 1, a single-phase design may also be provided, wherein preferably a circular-cylindrical insulating body is used, which, however, is centrally penetrated by a single phase conductor, which is surrounded coaxially by a single annular electrode. In addition to the use of a cylindrical insulating body 1, it is also possible to provide a profiling, for example a cup-shaped profiling or an application of rib-shaped structures on the insulating body 1, in order to extend at the end faces of the insulating body 1 an extension of creepage paths to the phase conductor (s) ) 3a, 3b, 3c.

In FIG. 3, a first embodiment of an electrode 3d is shown cut away from insulating bodies and phase conductors. The first embodiment of an electrode 3d is formed as a metallic cast body, wherein the first embodiment of an electrode 3d is designed substantially annular. In the electrode wall of the first embodiment of an electrode 3d a plurality of apertures 9 are introduced. The openings 9 are arranged in the groove bottom of a lying on the outer periphery of the first embodiment of an electrode 3b receptacle 6a. In the present case, this receptacle 6a is additionally subdivided by a web 10 incorporated circumferentially in the groove bottom. Furthermore, am

Groove a first embodiment of a holding means 4d connected to the electrode 3d. The first embodiment of an electrode 3d and the first embodiment of a holding means 4d are integrally formed, wherein the first embodiment of the holding means 4d is radially fortragend formed. However, it can also be provided a multi-part design. The first embodiment variant of a holding means 4d has an interface 11. The interface 11 is substantially hollow-cylindrical, with the cylinder axis of the interface 11 being aligned substantially perpendicular to the cylinder axis of the annular first embodiment of an electrode 3d. In the receptacle 6a of the first embodiment of an electrode 3d measuring means can be inserted. Furthermore, the first embodiment of an electrode 3d can be encased with an electrically insulating material, wherein only the interface 11 in the cladding region of an insulating material thus forming is accessible. The material of the insulating Fabric body can be applied in the fluid state to the first embodiment of an electrode 3d and cover the apertures 9 and enforce the openings 9.

FIG. 4 shows a second variant of an electrode 3e. In the present case, the second embodiment of a metallic fabric or a

Expanded metal, wherein the annular shape is selected such that a receptacle 6b is formed on the outer periphery of the second embodiment of an electrode 3e. Consequently, breakthroughs extend in all areas of the electrode wall, such as. B. groove bottoms and groove cheeks 7a, 7b, which limit the recording 6b. In order to divide the receptacle 6b of the second embodiment of an electrode 3e, a plurality of stud bolts 12 are introduced on the circumference. The stud bolts 12 are arranged in the shield shadow of the local groove cheeks 7a, 7b of the receptacle 6b. A second embodiment variant 4e of a holding means uses one of the stud bolts 12 in order to be connected to the second embodiment of an electrode 3e. The second embodiment of a holding means 4e is formed as a cast body, which is screwed, for example, to the second embodiment of an electrode 3e. However, it may also be provided a one-piece mold. Particularly suitable materials are aluminum, brass or stainless steel for forming an electrode. By the second embodiment of a holding means 4e and the studs 12 is a subdivision of the groove-shaped receptacle 6b of the second embodiment of an electrode 3e, so that here on both sides of the studs 12 each have a sufficient receiving space for accommodating measuring means, in particular of two annularly circulating Rogowski coils ( analogous to FIGS. 2 and 3). In FIGS. 5 and 6, the second embodiment of an electrode 3e is shown in each case, wherein alternative shapes are selected for the second embodiment variant of the holding means 4e. FIG. 5 shows a third embodiment variant of a holding means 4f, wherein the third embodiment variant of a holding means 4f in cast execution is seated on a stud bolt 12 and is in contact via struts 13 with further stud bolts 12 distributed on the circumference. In the embodiment according to FIG. 5, for example, it is provided to brace the struts 13 with the stud bolts 12, whereas in the fourth embodiment of a retaining means 4g in a cast design according to FIG. 6 an encapsulation of stud bolts 12 with the struts 13 is proposed.

7 shows a fifth variant of a holding means 4h, which is designed as a sheet metal bent part, which rests in the bottom region of the receptacle 6b of the first embodiment of the electrode 3d and is connected at its radially forrollende free end with a molded molded body to form an interface 11. In order to separate the receptacle 6b of the first embodiment of the electrode 3d, in each case curved ring segments 14 are inserted between stud bolts 12, which have a portion of a radially surrounding the ring axis of the first embodiment of an electrode 3d web 10. Like the first embodiment of an electrode 3d, the ring segments 14 may be formed from a wire mesh or expanded metal. The fifth embodiment variant of a holding means 4h is equipped with struts 13, which are preferably fastened together with ring segments 14 in the receptacle 6b.

FIG. 8 shows a cross section through the first embodiment variant of an electrode 3d with inserted ring segment 14. In addition, a not shown in the previous figures shielding 15 is shown in section, which shields a groove opening of the receptacle 6b between the groove cheeks 7a, 7b, so that a dielectrically shielded and field-free space in the receptacle 6b between the groove cheeks 7a, 7b is formed.

FIG. 9 shows a development of the first embodiment of an electrode 3e. Two substantially similar electrodes 3e of the first embodiment Variant are arranged coaxially to each other, wherein two facing outer surfaces of two groove cheeks touch each other and are rigidly connected to each other. For example, in the case of a metallic construction, the second embodiments of electrodes 3e can be soldered to one another, so that the mutually facing groove cheeks form a resulting receptacle 6c on a resulting resulting electrode 3f. The mutually facing groove cheeks form a web 10 a. In the joining region between the two second embodiment variants of an electrode 3e, a holding means 4i may be used in a fifth embodiment. The fifth embodiment variant of a holding means 4i projects radially from the resulting electrode 3f and is connected in a shielded area of the resulting receptacle 6c to the resulting electrode 3f. In FIG. 10, the resulting electrode 3f is shown in cross-section, wherein the two second embodiments of an electrode 3e are soldered together and the resulting receptacle 6c of the resulting electrode 3f is again covered by shielding plates 15 in a dielectrically shielded manner. Within the dielectrically shielded space according to FIG. 10 and also according to FIG. 8, the arrangement of measuring means, in particular of Rogowski coils, which are each arranged coaxially in the respective receptacle, can be provided (analogous to FIG. 2).

FIG. 11 shows the second embodiment of a

Electrode 3e with a sixth embodiment of a holding means 4j. The sixth embodiment variant of a holding means 4j is in the present case in the form of a bent sheet metal part, which is bent in a substantially U-shaped manner, wherein a circular widening interface 11 is located in the region of the U-shaped base. To stabilize the sixth embodiment variant of a holding means 4j, the U-shaped ends are connected to a transverse connection 16. The U-shaped ends of the sixth embodiment variant of a holding means 4j merge into curved struts 13 which, on the groove bottom of the receptacle 6b of the second embodiment variant of FIG. ner electrode 3e rest. There, the curved struts 13 are connected to the second embodiment of an electrode 3e angle rigid. In the circumferential direction of the receptacle 6b of the second embodiment of an electrode 3e angle 17 on the groove bottom of the receptacle 6b of the second embodiment of an electrode 3e are arranged stationarily. The angle 17 have a U-shaped profile, wherein one of the free U-legs on the groove bottom of the electrode extends lying so that on the opposite U-shaped leg of the respective angle 17 is given a contact surface to a shield plate 15, which in of Figure 11 is not shown for reasons of clarity, to serve as a contact surface. On both sides of the angle 17, there is now sufficient space to accommodate, for example, circular encircling measuring means (cf., FIG. 2) between the centrally arranged angles 17 and the groove cheeks 7a, 7b extending radially circumferentially on both sides of the angle 17. Via the interface 11 of the sixth embodiment of the holding means 4j, it is possible to guide measuring lines to the measuring means.

Regardless of the embodiments, as shown in Figures 1 to 11, it is provided to provide each of the electrodes 3a, 3b, 3c, 3d, 3e, 3f with openings 9, wherein the openings 9 depending on the choice of material for forming the electrodes 3a, 3b, 3c, 3d, 3e, 3f may be shaped differently. The individual electrodes together with measuring means 5a, 5b, 5c arranged thereon, shielding plates 15, groove cheeks 7a, 7b, etc., are preferably embedded in an insulating body 1, wherein the respective interface 11 of a respective embodiment 4a in a jacket region of an insulating body 1 which is preferably rotationally symmetrical , 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4i, 4j of a holding means, so that, for example, the electrical potential of the respective electrode 3a, 3b, 3c, 3d, 3e, 3f can be tapped. The individual variants of

Electrodes 3a, 3b, 3c, 3d, 3e, 3f and the individual embodiments of holding means 4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4i, 4j are interchangeable. In addition, From can be used as measuring means 5a, 5b, 5c most diverse variants. In addition to the use of Rogowski coils also Hall sensors or other measuring means can be used.

Claims

claims

An electrode arrangement comprising a field-influencing electrode (3a, 3b, 3c, 3d, 3e, 3f) with an electrode wall,

d a d u r c h e c e n c i n e s that

the electrode wall has at least one opening (9).

2. Electrode arrangement according to claim 1,

d a d u r c h e c e n c i n e s that

the breakthrough (9) is at least partially covered with a material which has a different electrical field compared to the electrode wall.

3. electrode assembly according to claim 2,

d a d u r c h e c e n c i n e s that

the material is a dielectric.

4. electrode arrangement according to claim 2 or 3,

d a d u r c h e c e n c i n e s that

the material passes through the opening (9) and covers at least parts of the electrode wall.

5. electrode assembly according to claim 4,

d a d u r c h e c e n c i n e s that

the electrode (3a, 3b, 3c, 3d, 3e, 3f) is at least partially, in particular completely embedded in the material.

6. Electrode arrangement according to one of claims 1 to 5, d a d e r c h e c e n e c e s in that e

the electrode wall has a lattice structure.

7. The electrode arrangement according to claim 1, wherein:

the electrode (3a, 3b, 3c, 3d, 3e, 3f), in particular the electrode wall is at least partially substantially annular shaped.

8. Electrode arrangement according to claim 7,

d a d u r c h e c e n c i n e s that

the electrode (3a, 3b, 3c, 3d, 3e, 3f) is provided with a radially extending holding means 4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4i, 4j).

9. electrode arrangement according to claim 8,

d a d u r c h e c e n c i n e s that

a transition from the holding means (4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4i, 4j) to the electrode (3a, 3b, 3c, 3d, 3e, 3f) is arranged in a shielded section.

10. Electrode arrangement according to claim 8 or 9,

d a d u r c h e c e n c i n e s that

the retaining means (4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4i, 4j) projects at least partially from a jacket of the electrode (3a, 3b, 3c, 3d, 3e, 3f) with the material.

11. The electrode arrangement according to claim 1, wherein:

the electrode (3a, 3b, 3c, 3d, 3e, 3f) is part of a capacitive voltage divider.

12. The electrode arrangement according to claim 1, wherein:

the electrode (3a, 3b, 3c, 3d, 3e, 3f) has a dielectrically shielded receptacle (6, 6a, 6b, 6c) for a measuring means (5a, 5b, 5c).

13. The electrode assembly according to claim 8, wherein:

a transition from the holding means (4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4i, 4j) to the electrode (3a, 3b, 3c, 3d, 3e, 3f) in the region of the receptacle (6 , 6a, 6b, 6c).