WO2022194328A2 - Niederspannungsabschirmkörper, niederspannungsstromwandler, niederspannungsstromwandleranordnung bzw. niederspannungselektrikanordnung - Google Patents
Niederspannungsabschirmkörper, niederspannungsstromwandler, niederspannungsstromwandleranordnung bzw. niederspannungselektrikanordnung Download PDFInfo
- Publication number
- WO2022194328A2 WO2022194328A2 PCT/DE2022/100210 DE2022100210W WO2022194328A2 WO 2022194328 A2 WO2022194328 A2 WO 2022194328A2 DE 2022100210 W DE2022100210 W DE 2022100210W WO 2022194328 A2 WO2022194328 A2 WO 2022194328A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- low
- voltage
- shielding body
- current transformer
- housing
- Prior art date
Links
- 239000000463 material Substances 0.000 claims description 30
- 125000006850 spacer group Chemical group 0.000 claims description 28
- 230000005291 magnetic effect Effects 0.000 claims description 24
- 230000035699 permeability Effects 0.000 claims description 18
- 238000013461 design Methods 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 230000001427 coherent effect Effects 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 72
- 230000004907 flux Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000000853 adhesive Substances 0.000 description 7
- 230000001070 adhesive effect Effects 0.000 description 7
- 238000004804 winding Methods 0.000 description 7
- 239000004020 conductor Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 238000003475 lamination Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000000712 assembly Effects 0.000 description 4
- 238000000429 assembly Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910000595 mu-metal Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002470 thermal conductor Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
- H01F27/366—Electric or magnetic shields or screens made of ferromagnetic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/30—Constructions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/06—Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
Definitions
- Low-voltage shielding body low-voltage current transformer, low-voltage current transformer arrangement or low-voltage electrical arrangement
- the invention relates to low-voltage electrical arrangements and corresponding ones
- EP 0011 590 A1 EP 1 241 926 A2, EP 2 700953 A2, GB 2 073 499 A, DE 17 66774 A1 or DE 101 55450 A1.
- WO 1991/019305 A1 in particular discloses a low-voltage shielding body which, when attached to a low-voltage current transformer, is intended to improve the measurement accuracy, with this arrangement being designed in particular for low-voltage currents of more than 1 kA.
- the object of the present invention to provide a low-voltage current transformer that can be flexibly replaced and is as accurate as possible.
- the object of the invention is achieved by low-voltage shielding bodies, low-voltage current transformers, low-voltage current transformer arrangements or low-voltage electrical arrangements having the features of the independent claims. Further advantageous configurations, which may also be independent of this, can be found in the subclaims and the following description.
- the invention is based on the basic knowledge that by separating the functionalities of the shielding on the one hand and the attachment on the other hand, in particular also in contrast to WO 1991/019305 A1, a low-voltage current transformer that can be used flexibly and is as accurate as possible can be provided.
- a low-voltage shielding body can in particular have a shielding body that is geometrically simple and/or optimized for its function or a suitable fastening and/or a low-voltage current transformer can have a suitable holder for a low-voltage shielding body or be suitably fastened.
- a low-voltage current transformer comprising a housing and a transformer core held by the housing and surrounding a low-voltage busbar opening can be characterized in that the housing has a shielding body mount for holding a low-voltage shielding body.
- a shielding body designed to match the shielding body mount can then be held by the shielding body mount in the appropriate position in relation to the converter core. Due to the shielding body, such an arrangement enables a correspondingly increased measurement accuracy if this appears necessary under the given installation conditions, while the shielding body can be dispensed with in a flexible manner if corresponding shielding is not absolutely necessary.
- the low-voltage shielding body can be inserted into or removed from the shielding body holder independently of the transformer core. This enables easy conversion if this appears necessary.
- any construction group of the housing of a low-voltage current transformer which is suitable and intended for holding a shielding body can be used as a shielding body mount.
- a corresponding shielding body mount can be attached or provided in several pieces to the housing.
- a corresponding shielding body mount can be formed in one piece with the corresponding housing.
- the shielding body holder comprises at least one holding web, so that a free area is arranged in the housing, which connects a shielding body provided for the low-voltage area to the rest of the interior of the housing.
- a free area can be created in which the low-voltage shielding body can be inserted into the low-voltage current transformer as simply as possible and at the same time can be held by the holding web.
- the holding web can hold the low-voltage shielding body from any side and, in cooperation with the walls of the housing, for example, ensure the appropriate hold of the low-voltage shielding body.
- the shielding body mount preferably comprises two holding webs, since the
- the holding web extends from a housing wall going perpendicularly to this housing wall and forms an overhang for holding the low-voltage shielding body.
- the overhang of the holding webs ensures that the low-voltage shielding body is held appropriately without covering a large part of the surface of the low-voltage shielding body.
- the holding webs can hold the low-voltage shielding body with a minimal coverage area of the latter.
- the holding web or the holding webs are arranged on any side of the low-voltage shielding body.
- the holding webs or the holding web extend from the housing wall perpendicularly to this housing wall and thus form a corresponding overhang, so that the low-voltage shielding body is held laterally by overhangs.
- the holding web extends from a housing wall, starting perpendicularly to this housing wall, but is arranged, for example, below or above the low-voltage shielding body.
- Various configurations are conceivable here, which can entail different structural configurations depending on the configuration of the low-voltage current transformer.
- the holding webs may also have other functions, such as latching functions or safety functions, with which the housing halves are connected to one another or are secured against lateral slippage.
- a “free area” is understood to mean in particular an area within which no other objects or any other material are arranged that protrude into this area, so that the area is free for the use of an object.
- a free area can thus represent, for example, an area that is available to a low-voltage shielding body and thus includes at least the volume of the low-voltage shielding body.
- a vacant area can be regarded as an empty space.
- a “retaining web” can preferably be understood to mean a plate-like or sheet-like accumulation of a material which, for example, protrudes from the housing or is arranged on it and correspondingly due to its shape and its positioning, in particular in relation to the housing and the Low-voltage shielding body can achieve a corresponding holding of the low-voltage shielding body.
- the holding web can in particular be formed in one piece with the housing.
- housing wall is preferably understood to mean any wall of the housing.
- a housing can be formed from several housing walls.
- a “housing” is understood to mean, in particular, a solid shell for the low-voltage current transformer, which protectively surrounds the transformer core and is preferably not electrically conductive at room temperature or under operating conditions.
- the housing is also preferably not made of metal, for example made of plastic.
- a housing can be designed as a divided housing, in which case the housing can consist of several, in particular two, housing parts.
- the housing is preferably a good thermal conductor in order to dissipate any heat generated in the transducer cores or in the pickup coils.
- the housing is cast, possibly even cast around the converter core and the other assemblies to be arranged inside the housing.
- the housing can include a transformer core holder, by means of which the transformer core of the low-voltage current transformer is held in the housing.
- the converter core holder can also be designed as a fastening, so that the converter core is not only held but is firmly connected to the housing under normal operating conditions.
- the term "converter core”, often colloquially also called armature, refers to an assembly that is designed to conduct magnetic flux.
- the magnetic flux density is a physical quantity of electrodynamics. It is the areal density of the magnetic flux that passes perpendicularly through a specific surface element, in particular through a surface element of the transformer core.
- a transducer core can preferably consist of a soft magnetic material with the highest possible magnetic saturation flux density, with the most linear characteristic possible and the highest possible magnetic permeability.
- the magnetic flux which is induced by a primary current in the converter core, can be bundled or guided with low losses. This ensures that the primary current generates a course of the secondary current that is as linear as possible and that the required load power is essentially guaranteed.
- a transformer core can be produced by pressing a suitable ferromagnetic powder in a tool.
- the pressed so-called green compacts are generally solidified in subsequent temperature treatments and, in the case of ferrite materials, optionally sintered at high temperature to form a ceramic.
- a transformer core can in particular also be made up of several layers of a corresponding material, e.g. made of current transformer or transformer sheet metal.
- the strip material is preferably equipped with a thin insulation layer to reduce eddy current losses.
- insulating layers such as targeted oxidation or a coating with a fack and the like.
- the material jump caused between the layers on the respective surfaces lying on top of one another can possibly already be sufficient to minimize the formation of current turbulence.
- a transducer core has a low hysteresis behavior in the
- the transformer core can be ring-shaped and have a central opening, which in the present context is referred to as a low-voltage busbar opening.
- the transformer core can then be wound in particular as a toroidal tape core in the form of a strip material, with the low-voltage busbar opening then being able to be provided in a structurally simple manner by the winding core on which the strip material is wound.
- the transformer core can be divided and have two or more transformer core parts, in the case of an annular transformer core in a not purely radial, so not in a low-voltage busbar opening representing or this parallel plane, running main axis plane is divided.
- a transformer core divided in this way can make it possible for a conductor for the primary current, called the low-voltage busbar in the present context, not to be threaded through the low-voltage busbar opening in the transformer core, but for the divided transformer core to be fitted around the low-voltage busbar in the open state can.
- the associated housing can or should also have a corresponding division.
- this can be designed as a cut strip core, in which case it is then preferably cut open, sawed through or otherwise severed transversely to the direction of flow in order to provide the converter core parts.
- the cut surface can be polished after cutting, whereby the magnetic flux property through the cut surfaces can be improved.
- a "low-voltage current transformer” is understood to mean a current transformer that is specially tailored to the requirements of
- the low-voltage range extends up to a voltage of 1,000 V, preferably up to a voltage of just 750 V or 720 V.
- certain devices for the low-voltage range defined in this way that can go up to Voltage up to 1,200 V or slightly above can be operated.
- such equipment is also not referred to as medium-voltage equipment, although it can still be operated in the lower limit range of the medium-voltage range to the low-voltage range.
- a current transformer in the present context is preferably an electrical or electronic device which generates a primary current in the present
- Correlation called according to low-voltage current converts into a secondary current according to a fixed relationship.
- the secondary current can, in particular, be an electrical signal adapted for measurement electronics, so that a current transformer can enable or simplify the measurement of the primary current or the low-voltage current.
- Low-voltage current transformers are suitable for low-voltage currents up to 1,000 A (1 kA) and in the present cases for low-voltage currents over 2 kA, in particular over 2.5 kA, or up to 10 kA and above can be used. It goes without saying that ultimately the low-voltage current transformer can also be operated at lower currents or voltages, although it is designed for correspondingly high currents or voltages. However, it has been shown that, particularly in the case of currents of more than 1 kA, low-voltage current transformers are subject to structural requirements which clearly distinguish such low-voltage current transformers from low-voltage current transformers intended for lower currents.
- the low-voltage busbar opening accordingly defines a transformer core plane in which or parallel to which the magnetic flux runs through the transformer core when a primary current flows in the low-voltage busbar.
- the housing of the low-voltage current transformer can also have a low-voltage busbar opening, so that the low-voltage busbar can be positioned in a suitable manner in relation to the transformer core.
- the housing encloses the transformer core, and this in particular also on the side of the transformer core which faces the low-voltage power rail opening.
- the housing side of the housing, which faces the low-voltage busbar opening can in particular also serve as a converter core holder, through which the converter core can be held by the housing.
- the transducer core holder for example in connection with a housing cover, can be designed in such a way that the transducer core is fastened in the housing by the transducer core holder, so that this can be defined as a fastening.
- the shielding body holder through which a shielding body can be held by the housing, for example by using a housing cover or by additional measures such as screws, clamps, straps or the like, can be designed in this way can be that a shielding body can be attached to the housing through them, so that the shielding body mount can also be used or referred to as a shielding body attachment.
- the transformer core holder or also the shielding body holder can be designed in one piece with the housing. This can also be done in particular by casting. If the housing is cast around the transformer core and the shielding body, the transformer core holders and/or the shielding body holder can also be cast in. In this case in particular, they are then considered lost and preferably consist of the housing material, so that as little disruption as possible can be expected as a result.
- the low-voltage current transformer often has at least one coil, which is designed as a wound conductor.
- a coil is in particular an electrical component which has a wound conductor and is set up to generate an electromagnetic field or to be inductively excited by it.
- coils consist of at least one winding of a conductor made of wire, enameled copper or aluminum wire, silver-plated copper wire, high-frequency stranded wire or ribbon, with the conductor usually being wound on a coil carrier.
- the transformer core itself can optionally serve as a coil carrier.
- the winding arrangement and shape, the wire diameter, the winding and the material of the transformer core determine the value of the inductance and other properties of the coil.
- a “coil carrier” is understood to mean, in particular, a rectangular, cylindrical or otherwise extending, shaped body with or without lateral flanges, on which a coil can be wound or is wound, which is then carried by the bobbin.
- Such a coil carrier can in particular stabilize the coil itself, which can ultimately simplify the winding process, for example.
- a secondary signal which corresponds to the magnetic flux in the transformer core, can then be provided via the coil, which is then preferably available as a secondary current for metrological purposes.
- the housing has a shielding body mount, which can be designed as a fastener if necessary, the presence of a housing fastener by means of which a low-voltage shielding body can be fastened to the housing of a low-voltage current transformer or can be attached or is attached, can be correspondingly advantageous.
- the term "enclosure attachment” describes any means by which a low voltage shielding body can be attached to an enclosure.
- This can in particular be adhesive, for example. This can, for example, only be applied shortly before the fastening process, with a two-component adhesive having proven to be advantageous in particular with such a procedure in terms of durability. It is also conceivable, for example, to provide a double-sided adhesive tape, which can be pre-installed on the housing or on a low-voltage shielding body, so that a corresponding attachment can be made quickly and quickly beforehand.
- the housing can also be fastened with retaining clips, retaining rails, Velcro strips, cable ties, separately and specially manufactured plastic snap-in devices or the like. include.
- a low-voltage current transformer that can be used flexibly and is as accurate as possible can be provided if a low-voltage current transformer arrangement, comprising a low-voltage current transformer comprising a housing and a low-voltage current transformer held by the housing and surrounding a low-voltage busbar opening, as well as a low-voltage Shielding body comprising a shielding body, characterized in that the low-voltage shielding body is attached to the housing of the low-voltage current transformer by means of a housing attachment. By loosening the attachment or by attaching it Even then it is possible to configure the associated low-voltage current transformer flexibly and to use it accordingly in order - depending on the requirements - to ensure appropriate shielding via the low-voltage shielding body.
- the low-voltage shielding body is attached to the housing itself - and not to the transformer core.
- the attachment can be done by plugging it on or by inserting it. It can often be sufficient if the attachment is captive with regard to the respective installation situation.
- a non-detachable connection ie a connection that cannot be detachable without destroying it, can also be used as a fastening, as can be realized, for example, with adhesive, but also with cable ties. Velcro strips, retaining clips, clip-on caps, etc.
- they can ensure captive but not inseparable attachment, with further measures such as gluing a housing, additional gluing or sealing and the like possibly being provided in order to implement inseparable attachment.
- a low-voltage shielding body that has a housing attachment by means of which the low-voltage shielding body can be fastened to a housing of a low-voltage current transformer can, with a suitable configuration, serve to provide a low-voltage current transformer that can be used flexibly and is as accurate as possible.
- the corresponding low-voltage shielding body can be attached to the housing of the low-voltage current transformer as required, if this appears necessary.
- a low-voltage shielding body that is to be used effectively as a shield can weigh several 100 grams or even several kilograms, which then requires a corresponding structural design of the housing attachment if this additional weight then loads the housing and the fastening of the low-voltage current transformer. This then also causes a considerable additional weight, which in terms of the stability of the associated low-voltage current transformer and its attachment by means of a transformer attachment to a low-voltage busbar or to a housing of a corresponding low-voltage electrical system must be taken into account.
- the fastening options already mentioned above come into consideration as fastening options.
- Low-voltage electrical arrangement such as, for example, can be provided on a transformer housing or on a switch cabinet housing or on corresponding support rails of this housing.
- a low-voltage Current transformers are provided when a low-voltage shielding body has a power rail attachment, by means of which the low-voltage shielding body can be fastened to a low-voltage busbar.
- housing attachment or the busbar attachment can advantageously be provided at least partially on the low-voltage shielding body or can be components of the same.
- the housing attachment can also be provided at least partially as part of the housing of the low-voltage current transformer or as a separate or supplementary assembly, as will be explained in detail below.
- a low-voltage current transformer that can be used flexibly and is as accurate as possible can be provided if a low-voltage electrical system consists of at least one low-voltage busbar and a low-voltage current transformer arrangement comprising a low-voltage current transformer comprising a housing and a transformer core held by the housing and surrounding a low-voltage busbar opening, wherein the low-voltage busbar extends through the low-voltage busbar opening and the low-voltage current transformer comprises a transformer attachment for attachment to the low-voltage busbar, characterized in that a Low-voltage shielding body by means of a busbar attachment to the low-voltage busbar and/or to the rivet the voltage-to-current converter is attached or attachable.
- a compact low-voltage current transformer that can be used flexibly and is as accurate as possible can be provided if a low-voltage electrical system consists of at least one low-voltage busbar and a low-voltage current transformer arrangement comprising a low-voltage current transformer compris
- the housing attachment or the busbar attachment can include a component on the side of the shielding body, which is permanently attached to the low-voltage shielding body.
- a component on the side of the shielding body can be a corresponding adhesive, for example.
- this can - of course - be another assembly, such as an eyelet, a threaded hole or the like, which is permanently installed in the low-voltage shielding body or connected to it.
- the housing attachment can have a housing-side component which is non-detachably attached to the housing.
- a one-piece design with the housing can be implemented, such as in the case of a shielding body mount or also if adhesive or attached eyelets, threads or the like are present.
- the low-voltage shielding body certainly entails an additional weight that must be taken into account with regard to a secure attachment of the low-voltage shielding body. This applies in particular when the low-voltage shielding body is to be attached to the low-voltage current transformer, since the transformer attachment then has to carry this additional weight accordingly. In this regard, it can then appear sensible in such an embodiment to upgrade the converter attachment in a suitable manner, if necessary. The latter can be done in particular by the converter attachment comprising a spacer plate which comes to rest on the housing and/or on the low-voltage busbar.
- Such a spacer plate can, in particular in contrast to other spacers that may be conceivable, ensure a large contact surface with the housing or with the low-voltage busbar, as a result of which the converter attachment is then more stable. This increased stability may be sufficient to ensure a sufficiently stable attachment of the low-voltage current transformer to the low-voltage busbar per se, so that the low-voltage current transformer can then also carry the low-voltage shielding body. It goes without saying that additional attachments, such as the busbar attachment explained above or attachment to the overall housing of the low-voltage electrical system, can be provided in order to ensure even more stability here.
- Such a spacer plate may not only increase the stability of the transformer attachment but also allow the low-voltage current transformer to be positioned more precisely in relation to the low-voltage busbar, which then correspondingly increases the measuring accuracy, for example by centrically or can be positioned in another predetermined form in relation to the low-voltage busbar.
- an additional attachment is provided by means of which the low-voltage current transformer is attached or can be attached to the low-voltage busbar.
- Such a Additional attachment can then be provided as required if the converter attachment, for whatever reason, cannot carry sufficient weight.
- this advantage can also be used independently of the use of a spacer plate or a busbar attachment.
- the additional attachment can include the types of attachment already explained in general terms above.
- the additional attachment can be realized in particular by clamping jaws, with the above-mentioned spacer plate possibly being able to serve as one of the clamping jaws.
- a low-voltage electrical arrangement made up of at least one low-voltage busbar and a low-voltage current transformer arrangement, comprising a low-current transformer comprising a housing and a transformer core held by the housing and surrounding a low-voltage busbar opening, the low-voltage busbar extending through the low-voltage busbar opening and the low-voltage current transformer having a transformer attachment for attachment of the low-voltage busbar, cumulatively or alternatively to the above-mentioned combinations of features, advantageously suitable for providing a flexibly replaceable low-voltage current transformer that is as accurate as possible when the converter attachment includes a spacer plate that comes into contact with the housing and/or on the low-voltage busbar, or the low-voltage current transformer supplements the Transformer attachment by means of an additional attachment to the low-voltage conductor rail attached or attachable.
- the additional fastening can comprise a busbar clip and/or a spacer plate which comes into contact with the housing and/or with the low-voltage busbar, as has already been explained above.
- the spacer plate can in particular have one or more projections, through which positioning of the spacer plate in relation to the low-voltage current transformer can be facilitated. If the spacer plate is then arranged below the low-voltage current transformer, it can also support it.
- the spacer plate preferably has an extension which corresponds approximately to the width of the low-voltage busbar or the low-voltage busbar opening on which the spacer plate is to come into contact.
- the supernatant then preferably projects beyond the width of the low-voltage busbar opening, so that then a corresponding installation of the supernatant on the housing of the low-voltage current transformer or on the transformer core can take place.
- the width of the low voltage busbar opening is preferably measured in the transformer core plane.
- the width can be measured parallel to the low-voltage busbar, which is often rectangular and flat, so that the width can be measured along the flat side of the low-voltage busbar.
- the respective overhangs each extend in the plane of the plate, so that the respective spacer plate still has an essentially plate-like shape. This enables a particularly versatile use, with the directions of rotation and installation directions in particular not being so important.
- the low-voltage current transformer is supported on the busbar clamp of the additional attachment, which can be implemented in a structurally particularly simple manner.
- low-voltage busbars especially when they are already permanently installed, are intended to conduct increasingly high currents.
- structural density with which such low-voltage busbars are laid is increasing more and more. This means that low-voltage current transformers that are already in use are subject to more and more interference fields, which is particularly problematic if not only two low-voltage current busbars run close together and a low-voltage current transformer is arranged on one of the two low-voltage current transformers, but on both.
- a low-voltage current transformer surrounds a first of the two low-voltage busbars and the low-voltage shielding body is arranged between the second of the two low-voltage busbars and the low-voltage current transformer.
- the low-voltage shielding body can be arranged between two low-voltage current transformers, which are each arranged on the two low-voltage busbars. In this way, the low-voltage shielding body can then shield both low-voltage current transformers from one another or from the other low-voltage busbar.
- the low-voltage busbar surrounded by the low-voltage current transformer has a kink.
- one leg of the kinked low-voltage busbar can be defined as being surrounded by the low-voltage current transformer, so that the crease then also has a leg that is kinked to this leg.
- the term "kink" refers to a change in direction of the low-voltage busbar with a radius of curvature that is less than twice, preferably than once, the extension of the low-voltage current transformer perpendicular to its converter plane, in particular less than twice, preferably than once, the extension of the corresponding transformer core is perpendicular to its transducer plane.
- the kink can be 90° or 45°, for example. It goes without saying that other angles can also occur. If the low-voltage current transformer is arranged in the vicinity of the kink, the low-voltage shielding body can be arranged between the bent leg and the low-voltage current transformer in order to reduce any interference fields caused by the bent leg. In this context, the aforementioned "proximity to the bend" is given when there is a risk of interference fields from the bent leg in expected operating situations.
- a low-voltage shielding body can be assigned a shielding level in which it has a particularly effective shielding effect.
- the presence of a correspondingly designed body for example a body with a sufficiently large permeability number m G greater than 5,000, can already have a shielding effect, even if the orientation with respect to a shielding plane is not taken into account. It goes without saying, however, that it makes sense to pay attention to the alignment of the shielding plane in order to ensure appropriate shielding that is as effective as possible or uses as little material as possible.
- the low-voltage shielding body when it is a
- the low-voltage busbar has a kink
- a corresponding low voltage shielding body may be attached to both low voltage busbars or low voltage current transformers in the manners described above. In this way, the load, which is caused by the low-voltage shielding body, is distributed, so that the associated fastenings can be designed accordingly for lighter weight and therefore also correspondingly more cost-effectively.
- a low-voltage shielding body can be characterized in that the low-voltage shielding body comprises a shielding body that is made of current transformer or transformer sheet metal in order to provide a low-voltage current transformer that can be used flexibly and is as accurate as possible.
- Current transformer laminations or transformer laminations are well known on the market and are used in a variety of forms in current transformers or transformers. In this respect, a shielding body made of sheet metal of this type can be provided relatively inexpensively.
- a corresponding low-voltage shielding body can only consist of the shielding body if, for example, the corresponding low-voltage shielding body is in a Housing bracket used or to be attached to a housing by simple housing fasteners, such as Velcro straps or cable ties.
- such a low-voltage shielding body will also have other components, such as a housing surrounding the shielding body or a coating, for example in the form of a cast body, which, among other things, protects the shielding body against external influences , such as weather influences or corrosive influences of the environment can protect.
- Such other assemblies are usually chosen so that they have a relative permeability m G close to 1, so that the effects on the magnetic flux are relatively small.
- the shielding body is made of a shielding material with a permeability number p r greater than 300, for example iron.
- permeability numbers p r of this order of magnitude are to be regarded as relatively low, materials with permeability numbers p r of this order of magnitude can already require certain shielding, which may be sufficient. As a rule, however, the use of such materials will very probably not be cost-effective with regard to the shielding effects that can be achieved.
- shielding materials with a permeability number p r greater than 5,000 or in particular greater than 10,000 or even greater have proven to be particularly advantageous and effective
- Combinations of features also a low-voltage shielding as advantageous to a to provide a low-voltage current transformer that can be used flexibly and is as accurate as possible if this is characterized in that the low-voltage shielding body comprises a shielding body made of a shielding material with a permeability number m G greater than 5,000, in particular greater than 10,000 or greater than 40,000.
- the low-voltage shielding body comprises a shielding body made of a shielding material with a permeability number m G greater than 5,000, in particular greater than 10,000 or greater than 40,000.
- planar shielding bodies which are therefore essentially plate-like, can be used easily in a prepared holder. Also, once properly positioned, they can be attached to appropriate objects, such as a housing of a low-voltage current transformer or even a low-voltage busbar, via simple attachments such as adhesive layers or retaining straps, Velcro strips or cable ties. They can also be used very flexibly.
- the low-voltage shielding body or the shielding body is designed to be flat and simply connected, ie without any openings or loops. In this way, the formation of eddy currents and similar side effects can be effectively reduced to a minimum, so that the shielding of the associated shielding body, which should preferably be correspondingly flat and simply coherent, can be optimized. Also arises at With such a configuration, the low-voltage shielding body or the shielding body can be manufactured in a relatively simple manner.
- a low-voltage current transformer that can be used flexibly and is as accurate as possible can be provided if a low-voltage shielding body is characterized in that it comprises a shielding body with a thickness of more than 1 mm and/or less than 60 mm .
- the thickness of the shielding body is preferably defined perpendicular to a shielding plane if such a shielding plane can be assigned to the associated shielding body or if its material, material composition or configuration allows such a definition.
- the thickness of the shielding body can also be measured, for example, parallel to the smallest dimension of the shielding body. In the end, this can easily be determined, particularly in the case of a flat shielding body. If the shielding body is curved or designed with a three-dimensional structure, the thickness of the shielding body can usually be defined along the narrowest extension from one surface to the other surface, with the thickness being measured perpendicular to these surfaces in each case .
- the shielding body is at least 1.8 mm thick in order to ensure adequate shielding.
- a corresponding minimum thickness can also ensure a certain inherent stability of the shielding body, so that handling when attaching, detaching, assembling and similar activities does not turn out to be too complex.
- a shielding body that is more than 60 mm thick is ultimately unsuitable in terms of its handling and weight and, in particular, makes retrofitting more difficult if a corresponding low-voltage current transformer is then to be arranged between two low-voltage busbars or between two low-voltage current transformers .
- countermeasures may have to be taken in a suitable manner, for example by using a shielding material with high permeability number m G or other measures to increase the shielding performance.
- the shielding body has a thickness of less than 50 mm, preferably less than 45 mm.
- the thickness of the shielding body can also be selected depending on the associated transducer core, which is to be shielded accordingly. Accordingly, regardless of the other combinations of features mentioned above, a low-voltage current transformer arrangement comprising a low-voltage current transformer comprising a housing and a transformer core held by the housing and surrounding a low-voltage busbar opening, as well as a low-voltage shielding body comprising a shielding body, is advantageous if it is characterized in that the Strength of the shielding body is chosen such that a magnetic reluctance is at least 0.01 times and/or no more than 1 times the magnetic reluctance of the transformer core in order to provide a low-voltage current transformer that can be used flexibly and is as accurate as possible.
- the strength of the shielding body is chosen such that its magnetic reluctance is at least 0.03 times, in particular 0.05 times, the magnetic reluctance of the transducer core in order to achieve a sufficiently high level of shielding at reasonable costs and an operationally safe avoidance of disturbing side influences.
- the thickness of the shielding body is chosen such that its magnetic resistance is no more than 6 times, preferably no more than 5.5 times, the magnetic resistance of the transducer core to be in a safe area in terms of shielding performance.
- the thickness of the shielding body is limited by the exact spacing of these assemblies, particularly in the case of low-voltage current transformers arranged close together or very close to a low-voltage current rail or very close to a kinked area of a low-voltage current rail is, since the corresponding shielding body or the corresponding low-voltage shielding body usually has to be arranged in between. Accordingly, the shielding performance, ie the magnetic resistance, can be influenced not only by the strength of the shielding body but also, for example, by its choice of material or by other measures.
- a shielding level ie a level in which the shielding takes place particularly effectively, can be assigned to a low-voltage shielding body or a shielding body. This also applies in particular when the shielding body is formed in layers, as will be explained in detail below, in which case the shielding plane can then generally be defined parallel to these layers.
- the low-voltage shielding body can then be arranged in relation to the low-voltage current transformer in such a way that the shielding plane is perpendicular to the transformer core plane of the low-voltage current transformer, at least with a significant component. This then requires correspondingly effective shielding.
- the shielding plane is aligned perpendicular to a distance between the low-voltage current transformer and an adjacent low-voltage current transformer or an adjacent low-voltage busbar against which the shielding is intended to act.
- the shielding plane can also be aligned parallel to the bent area or parallel to the plane of the transformer core.
- a low-voltage current transformer arrangement comprising a low-voltage current transformer comprising a housing and a transformer core held by the housing and surrounded by a low-voltage busbar opening, and a low-voltage shielding body comprising a shielding body, can be characterized in that the transformer core spans a transformer core plane and the shielding body extends more than 5% beyond the transformer core perpendicular to the plane of the transformer core, in order to provide a low-voltage current transformer that can be used flexibly and is as accurate as possible.
- a low-voltage current transformer arrangement comprising a low-voltage current transformer comprising a housing and a transformer core held by the housing and surrounded by a low-voltage busbar opening, as well as a low-voltage shielding body comprising a shielding body, can be characterized in that the transformer core spans a transformer core plane and parallel to the transducer core plane and perpendicular to a distance between the shielding body and the transducer core, the shielding body extends by more than 5% beyond the transducer core in order to provide a low-voltage current transformer that can be used flexibly and is as accurate as possible.
- the shielding body or the shielding body can be characterized in that the transformer core spans a transformer core plane and parallel to the transducer core plane and perpendicular to a distance between the shielding body and the transducer core, the shielding body extends by more than 5% beyond the transducer core in order to provide a low-voltage current transformer that can be used flexibly and is as accurate as
- Low-voltage shielding body can be assigned a shielding plane or if the shielding body is layered, the shielding body extends more than 5% parallel to the shielding plane or parallel to the layers via a vertical projection of the transformer core onto the shielding plane or onto one of the layers extend beyond the parallel plane in order to have a low-voltage current transformer that can be used flexibly and is as accurate as possible.
- the shielding of the respective low-voltage shielding body can be increased, since it the magnetic flux is made more difficult to reach the low-voltage shielding body around the low-voltage current transformer.
- the associated overhang can also be selected to be larger, for example so that the extent extends by more than 20% or more than 50% beyond the converter core.
- the extension can also be selected to be more than 100% larger beyond the transducer core. It goes without saying that there may also be a slight underlap. If this is 50% in relation to the extension of the converter core, the shielding performance becomes questionable.
- the extension is selected to be larger than the housing not only in relation to the transducer core but also in particular in relation to the housing, which in this respect also has a positive effect on the shielding.
- the overhang can be found, for example, in weight, in the practicability of handling and also in the size of the respective low-voltage shielding body itself.
- the low-voltage shielding body or the shielding body can be formed in layers.
- a low-voltage shielding body can be characterized in that the low-voltage shielding body comprises a layered shielding body body in order to provide a low-voltage current transformer that can be used flexibly and is as accurate as possible.
- Such layers can be produced, for example, by winding appropriate foils or metal sheets, which are then severed in a suitable manner.
- Current transformer laminations or transformer laminations in particular, can preferably be used for this purpose.
- the individual layers can each be coated or otherwise isolated from one another in order to reduce any jumps and the formation of eddy currents to a minimum.
- the surface transitions between the layers may already be sufficient for such effects.
- a low-voltage current transformer arrangement which comprises a low-voltage current transformer comprising a housing and a transformer core held by the housing and surrounding a low-voltage busbar opening, and a low-voltage shielding body comprising a shielding body, can be characterized in that the shielding body is layered is formed and the layer is arranged perpendicular to the core plane of the converter in order to provide a low-voltage current converter that can be used flexibly and is as accurate as possible.
- the layers of the shielding body preferably have a layer thickness
- the layer thickness is even more than 0.1 mm, since this enables the respective layer to be easily handled when packing the layers.
- the layers of the shielding body have a layer thickness of less than 1.8 mm, in particular less than 1.5 mm.
- any eddy currents that can form in the layers can be reduced to a minimum, which is correspondingly useful with regard to a high permeability number m G .
- layer thicknesses of less than 1.0 mm or even less than 0.5 mm can prove to be advantageous.
- larger layer thicknesses, that is to say just over 0.5 mm can be sufficient, with this certainly also depending on other material parameters, such as the permeability number m G .
- the layers are aligned parallel to the course of the field lines to be shielded; this corresponds to the preferred alignment of the shielding plane, which has already been explained above.
- the layers are aligned parallel to the course of the field lines to be shielded and perpendicular to the plane in which the field lines to be shielded lie, which accordingly results in particularly effective shielding.
- the layers will then be aligned perpendicular to a distance between the low-voltage current transformer and neighboring low-voltage current transformers or from neighboring low-voltage busbars.
- the shielding body can comprise at least 3, preferably at least 5 or at least 10 layers, with clear effects in terms of improved shielding already being observed from 3 layers onwards, which increase with the increase in the number of layers.
- more than 20 layers have proven advantageous in this regard.
- 600 layers and more are also conceivable, as long as sufficient packing densities can be guaranteed.
- a compromise must be found between the number of layers and the weight or volume of the shielding body, in which case—as already explained above—the layer thickness cannot be arbitrarily reduced in order to be able to increase the number of layers even further.
- a maximum number of layers of 300 or 200 layers, in particular 150 layers proves to be advantageous.
- the low-voltage shielding body is for shielding a magnetic field and just not related to shielding an electric field.
- FIG. 1 shows a first low-voltage electrical arrangement in a perspective schematic view obliquely from above
- FIG. 2 shows a second low-voltage electrical system in a perspective schematic view corresponding to FIG. 1;
- FIG. 3 shows the low-voltage electrical arrangement according to FIG. 2 in a partially exploded view corresponding to FIG. 2;
- FIG. 4 shows the low-voltage electrical arrangement according to Figs. 2 and 3 in a partially exploded view obliquely from below;
- Fig. 5 shows the low-voltage electrical arrangement according to Figs. Figures 2 to 4 are a partially exploded top side view;
- FIG. 6 shows a schematic partial section through a low-voltage current transformer and a low-voltage shielding body of the arrangement according to FIG. 1 perpendicular to the plane of the transformer core;
- FIG. 7 shows a schematic partial section corresponding to the section according to FIG. 6 through an alternative low-voltage shielding body
- FIGS. 8 shows a busbar clamp designed as a spacer plate, corresponding to one of the busbar clamps according to FIGS. 2 to 5; 9 shows another busbar clamp designed as a spacer plate, corresponding to one of the busbar clamps according to FIGS. 2 to 5; 1 and 2; 11 shows a fourth low-voltage current transformer arrangement in a perspective and partially exploded view;
- FIG. 12 shows the arrangement according to FIG. 11 in the assembled state
- 13 shows a fifth low-voltage current transformer arrangement in a perspective and partially exploded view
- FIG. 14 shows the arrangement according to FIG. 13 in the assembled state;
- 15 shows a sixth low-voltage current transformer arrangement in a perspective and partially exploded view;
- FIG. 16 shows the arrangement according to FIG. 15 in the assembled state
- 17 shows a seventh low-voltage current transformer arrangement in a perspective and partially exploded view
- FIG. 18 shows the arrangement according to FIG. 17 in the assembled state
- 19 shows another low-voltage shielding body in an exploded view
- FIG. 20 shows the low-voltage shielding body according to FIG. 19 in an eighth low-voltage current transformer arrangement
- FIG. 21 shows the low-voltage shielding body according to FIG. 19 in the ready-to-assemble state
- 22 shows the arrangement according to FIG. 20 in the assembled state
- FIG. 23 shows a ninth low-voltage current transformer arrangement, partially open
- 24 shows a tenth low-voltage current transformer arrangement
- FIG. 25 shows the low-voltage current transformer arrangement according to FIG. 24 partially opened
- 26 shows a further low-voltage current transformer arrangement in a perspective view
- 27 shows a schematic cross section through a low-voltage busbar and shielding bodies arranged in relation to it;
- FIG. 28 shows a schematic plan view of a low-voltage busbar and shielding bodies arranged in relation to it; 29 shows a further low-voltage current transformer arrangement, partially opened; and FIG. 30 shows the low-voltage current transformer arrangement according to FIG. 29 without the transformer core and collector coil used.
- the low-voltage electrical system 1 shown in FIG. 1 comprises three
- Low-voltage busbars 11 which are each surrounded by a low-voltage current transformer 2 and form three low-voltage current transformer arrangements 10 accordingly.
- the low-voltage current transformers 2 are each fastened to the low-voltage busbars 11 via transformer fasteners 27, the transformer fasteners 27 each comprising a fastening plate 271 and fastening screws 272, and the fastening plate 271 is permanently fastened to a housing 23 of the respective low-voltage current transformer 2.
- a detachable connection for example via a dovetail connection, can also be provided here, but this does not change the basic structure.
- the low-voltage current transformers 2 are arranged at the same level, so that they are accordingly arranged in a common transformer core plane 211, which is spanned by the associated transformer cores 21.
- the converter cores 21 are each located in the associated housings 23 and each surround a low-voltage busbar opening 24, as shown by way of example in FIGS. 23 and 25 and then also explained with reference to these figures. It goes without saying that--depending on the specific circumstances--the low-voltage current transformers 2 can also be arranged at different heights.
- low-voltage shielding bodies 3 are arranged, which are fastened to the housings 23 of the low-voltage current transformers 2 via housing fasteners 32.
- the housing attachment 32 has projections of the low-voltage shielding body 3, which serve as components 321 of the housing attachment 32 on the shielding body side.
- the housing attachment includes 32 mounting screws 323 in threaded openings of the supernatants or the Shielding body side component 321 are provided so that the low-voltage shielding body 3 can be attached to the housing 23 of the low-voltage current transformer 2.
- the busbar clamps 41 have suitable overhangs 421.
- the arrangement according to FIGS. 2 to 5 also has busbar fastenings 33, by means of which the low-voltage shielding body 3 can be fastened directly to the respective low-voltage busbars 11.
- These busbar fasteners 33 each have fastening screws 331 for fastening brackets 332, by means of which the busbar fastener 33 can be clamped to the respective low-voltage busbars 11.
- the fastening clamps 332 are then fastened to the low-voltage shielding bodies 3 via the fastening screws 323 of the housing fastening 32 .
- FIG. 6 each have, as shown in particular in FIG. 6, a shielding body 31 which is cast into a base body which, in this exemplary embodiment, consists of plastic.
- This base body also forms the overhangs 421 for the component 321 of the housing attachment 32 on the side of the shielding body, in which the already explained threaded openings may be embedded.
- the low-voltage shielding body 3 and therefore also the respective shielding body 31 can be positioned in relation to the housing 23 of the low-voltage current transformer 2 in this way. This positioning takes place in particular in relation to the converter core 21 and its converter core plane 211 spanned by it.
- a distance 212 of the shielding body 31 from the converter core 21 can then also be defined by the corresponding arrangement - namely as the shortest distance between the converter core 21 and the shielding body 31.
- the shielding body 31 is made up of several layers 311, so that the shielding body 31 can also be easily assigned a shielding plane 34.
- the layer thicknesses can be less than 0.1 mm. Cumulatively or as an alternative to this, in particular more than 6 layers 311 and possibly more than 50 or more than 100 or even more than 600 layers can be used.
- the number of layers is particularly preferably at least more than 3 or between 10 and 100. In the present exemplary embodiment, 20 layers 311 are used.
- the number of layers 311 can depend in particular on the type of specific application, on the material selected, on the layer thickness and on other parameters.
- a thickness 312 of the shielding body 31 can be defined perpendicularly to the shielding plane 34 or also along the narrowest extension of the shielding body 31 .
- the shielding plane 34 is perpendicular to the distance 212 of the shielding body 31 from the transformer core 21 or perpendicular to the transformer core plane 211.
- the alternative low-voltage shielding body 3 shown in Figure 7 essentially corresponds to the low-voltage shielding body FIG. 6, the shielding body 31 being constructed higher along the shielding plane 34, so that a corresponding extent over the converter core 21, which is also present in the exemplary embodiment according to FIG. 6, is increased.
- the low-voltage shielding body 3 and therefore also the associated shielding body 31 also protrude in the transducer plane 21 itself beyond the transducer core 21 or beyond the housing 23.
- busbar clamps 41 used in the exemplary embodiment according to FIGS. 2 to 5 can alternatively also be designed in the form of plates, as shown in FIGS. 8 and 9 as an example.
- busbar clamps 41 can also serve as spacer plates 42, whereby their surface, depending on the specific arrangement, is attached to the housing 23 of the busbar clamps 41.
- Low-voltage current transformer 2 or a low-voltage busbar 11 can be applied.
- the spacer plates 42 can lie flat against one another.
- the busbar clamps 41 or corresponding spacer plates 42 can be used to position the low-voltage current transformer 2 or the low-voltage shielding body 3 in relation to the respective low-voltage busbar 11, regardless of whether this is used as an additional attachment 4 or just as a spacer plate 42 can be used without an additional fastening function.
- the use of such spacer plates 42 has the particular advantage that the friction and thus the fastening strength can be correspondingly increased by the surface contact.
- a suitable arrangement of the spacer plates 42 and a suitable choice of their strength can also enable the best possible centering of the low-voltage current transformer 11 in relation to the low-voltage busbar 11 .
- the low-voltage electrical arrangement 1 shown in FIG. 10 essentially corresponds to the arrangements according to FIGS. 1 to 5 and also uses the busbar clamps 41 as a spacer plate 42.
- a low-voltage current transformer 2 is also part of the low-voltage electrical system 1, which is arranged around a low-voltage busbar 11 and in this way provides a low-voltage current transformer arrangement 10.
- the low-voltage current transformer 2 itself is attached to the low-voltage busbar 11 in a conventional manner via a transformer attachment 27, which is not visible here but is described with reference to the above exemplary embodiments, with the corresponding attachment plate 271 and attachment screws 272.
- low-voltage shielding bodies 3 are provided on both sides of the low-voltage current transformer 2, which essentially only consist of a flat shielding body 31, which corresponds to the shielding body according to FIGS.
- the shielding body 31 according to FIG. 10 can be blank. However, it is also conceivable that an anti-corrosion agent or some other thin coating protects the shielding body 31 of the exemplary embodiment according to FIG.
- the shielding body 31 is accommodated in a fastening body 324, which is fastened to the low-voltage busbar 11 via a busbar clamp 41 with fastening screws 411 and rear spacer plates 42, which also serve as busbar clamps 41.
- the fastening takes place here via recesses and legs of the fastening body 324, which is also designed like a shell in this exemplary embodiment. Alternatively, however, other configurations can also be provided here.
- the spacer plates 42 also act here between the low-voltage busbar 11 and the housing 23, so that in this way positioning of the low-voltage current transformer 2 in relation to the low-voltage busbar 11 can be improved.
- a good busbar fastening 33 can also be realized in this way.
- the low-voltage current transformer arrangement 10 shown in FIGS. 11 and 12 comprises a low-voltage current transformer 2 with a low-voltage busbar opening 24, in which ultimately a low-voltage busbar 11 can in turn be arranged.
- the low-voltage shielding body 3 of the embodiment shown in FIG. 10 can also be used in this embodiment come, which can be formed, for example, with a layer structure or with and without a coating.
- the fastening bodies 324 each have latching lugs 325, by means of which the fastening caps 324 can be snapped onto the housing 23 of the low-voltage current transformer.
- fastening bodies 324 are formed from a non-conductive plastic.
- the low voltage busbar opening 24 has a width 241 which can be measured in the transducer core plane 211.
- the width 241 of the low-voltage busbar opening 24 is preferably measured according to the arrangement of the low-voltage busbar 11 or perpendicular to the shielding plane 34 of the respective shielding bodies 31 .
- the locking lugs 325 can also be omitted if necessary.
- the exemplary embodiment according to FIGS. 15 and 16 also uses Velcro strips 326 as part of the housing attachment 32, but here the two low-voltage shielding bodies 3 are secured directly to one another via Velcro strips 326, while the fastening bodies 324 were merely slipped over protectively.
- FIGS. 17 and 18 essentially corresponds to the arrangement according to FIGS. 15 and 16, but the housing attachment 32 has components 321 on the shielding body in the form of tabs, which are captively connected to the low-voltage shielding body 3 and by means of which cable ties 327 can be performed, by means of which the two low-voltage shielding body 3 can be attached to the housing 23.
- the fastening caps 324 only serve as a cover.
- the embodiment shown in Figures 19 to 22 is based on a ring-like low-voltage shielding body 3, which is composed of two shielding body parts 35, which in turn, as shown in Figures 19 and 20, consist of a ring-like shielding body 31, which also consists of two body parts 36 is provided.
- Cover layers 351 are also provided, one of which has a slight overhang to facilitate positioning. Otherwise, these cover layers 351 only serve to protect the shielding body 31.
- cover layers 351 are captively connected to the respective body part 36, in which case an adhesive connection or casting of these components can preferably also take place here.
- the low-voltage shielding body 3 can then be assembled and fixed from its shielding body parts 35 on the one hand and fastened to the housing 23 of the low-voltage current transformer 2 on the other hand via a housing fastening 32, which comprises a fastening plate 328 and fastening screws 323.
- a housing fastening 32 which comprises a fastening plate 328 and fastening screws 323.
- the fastening screws 323 are screwed into the housing 23, which is cast so that a tight fit can be ensured.
- other types of connection such as more complex clamping systems or adhesive connections, can also be used as an alternative.
- the low-voltage current transformer arrangement 10 shown in Figure 23 essentially comprises a low-voltage current transformer 2, in which the side of the housing 23 facing the low-voltage busbar opening 24 also serves as a transformer core holder 26, in that the pickup coils 22 of the transformer core 21 are supported on this side of the housing 23 .
- Low-voltage shielding bodies 3 can then be inserted into a remaining gap between the transformer core 21 or its pick-up coils 22 and the side of the housing 23 opposite the low-voltage busbar opening 24, so that this wall or side of the housing 23 interacts with the Transducer core 21 or the respective pickup coil 22 provides a shielding body mount 25 .
- a converter attachment can then be realized by casting or by closing the housing 23 .
- the other low-voltage current transformers 2 presented here are also provided with a transformer core 21 and pick-up coils 22 in their interior, whereby with regard to the exact design of the respective transformer cores 21 and the pick-up coils 22 and their arrangements, there are deviations that are already sufficiently known from the status quo known in the art are possible.
- a circumferential and essentially continuous pick-up coil 22 can be provided, for example. It is also conceivable that only one or very small or short pick-up coils 22 are provided.
- the housing 23 can also be cast.
- FIGS. 24 and 25 also shows a similar construction, but here a separate shielding body holder is provided in the housing 23
- each of which low-voltage shielding bodies 3 can be inserted and which can therefore be referred to as the housing-side component 322 of the housing attachment 32 of the low-voltage shielding body 3 on the housing 23 .
- low-voltage shielding bodies 3 can be inserted or removed, depending on the requirements, insofar as the housing is not yet permanently closed. In this way, a low-voltage current transformer 2 that can be used flexibly and is as accurate as possible can be provided.
- the low-voltage shielding body 3 is preferably formed essentially from the shielding body 31, which—as already explained in detail above—can be varied in many respects or adapted to the actual circumstances.
- a low-voltage shielding body 3 can also be arranged in the area of a bend 110 of the low-voltage busbar 11, as shown by way of example in FIG.
- interference fields can occur in a low-voltage current transformer 2 due to a bent leg 112 if the low-voltage current transformer 2 surrounds the other leg 111 of the bend 110 in the vicinity of the bend 110 . It can then be advantageous to arrange a low-voltage shielding body 3 between the bent leg 112 and the low-voltage current transformer 2 .
- the low-voltage current transformer 2 with the layers of its shielding body or with its shielding plane 34 parallel to the transformer core plane of the corresponding low-voltage current transformer 2 or parallel to the bent leg 112 may be arranged.
- Figures 27 and 28 show an example of the arrangement of shielding bodies 31 in relation to a low-voltage busbar 11 through which a low-voltage current 5 flows.
- the low-voltage current 5 generates field lines 50 in a manner known per se, which run around the low-voltage busbar 11 in a field line plane 51 .
- Shielding bodies 31 can be arranged shielding in different ways in relation to the field line level 51 or in relation to the course of the field lines 50 .
- the shielding body 31 or the associated low-voltage shielding body 3 can be aligned in such a way that its layers 311 and therefore its shielding plane 34 are tangential to the course of the field lines in the field line plane 51 and are aligned perpendicularly to the field line plane 51 .
- the arrangement of the shielding body 313 corresponds, for example, to the corresponding arrangement of the low-voltage shielding body 3 in FIGS. 1 to 7 and 10 to
- the low-voltage shielding body 3 according to FIGS. 19 to 22 also has corresponding partial areas. Likewise, individual low-voltage shielding bodies 3 of the arrangements shown in FIGS. 23 to 25 are aligned accordingly.
- the shielding body 31 can also have layers 311 that are not tangential to the course of the field lines in the field line plane 51, but can have layers 311 that are oriented perpendicularly to the field line plane 51, as shown by way of example in Figure 27 by the shielding body 315.
- Such arrangements are found, for example, in individual Low-voltage shielding bodies 3 of the arrangements shown in Figures 23 to 25 and in partial areas of the low-voltage shielding body 3 according to Figures 19 to 22.
- the shielding body 31 can be arranged in such a way that its layers 311 are aligned tangentially to the course of the field lines in the field line plane 51 and not at right angles to the field line plane 51, as shown by way of example using the shielding body 316 in Figure 28.
- FIGS. 29 and 30 also shows a structure similar to that shown in the embodiment according to FIGS. As a result, a free area 29 is arranged in the housing 23 . This connects an area 39, which is provided for the low-voltage shielding body 3, with the rest of the interior 231 of the housing 23.
- the holding webs 28 extend, starting from a housing wall 232, perpendicular to this housing wall 232 and form an overhang, as a result of which the low-voltage shielding body 3 is held.
- the holding webs 28 thus each have a free area 29 ready, in which the low-voltage shielding body 3 can be inserted in the simplest possible way and held by the overhang of the holding webs 28 .
- the holding webs 28 only hold the low-voltage shielding body 3 in a small outer area, so that most of the low-voltage shielding body 3 is exposed to the area 39 or to the rest of the interior of the housing 23 or is not covered by a shielding body holder 25, for example.
- the low-voltage shielding body 3 is thus held sufficiently in the present exemplary embodiment according to FIGS. 29 and 30 by the retaining webs 28, but with a minimum of structural and material effort required, with a simple installation of the low-voltage shielding body 3 in the low-voltage current transformer 2 being possible.
- the low-voltage shielding body 3 can be fixed by two-sided pressure, on the one hand by the retaining bar 28 and on the other side by the housing wall 232, so that the low-voltage shielding body 3 is clamped between the retaining bar 28 and the housing wall 232.
- a holding web 28 does not necessarily have to be formed on both sides of the low-voltage shielding body 3 in order to be able to grip or hold it accordingly, but an additional holding web or several additional holding webs can be saved in that instead, the area 29 between the holding web 28 and the housing wall 232 is used to hold the low-voltage shielding body 3 .
- the retaining webs 28 are formed like plates in order to be able to provide a sufficiently strong mounting of the low-voltage shielding body 3 with as little structural effort and use of materials as possible.
- any other structures can be used as holding webs, as long as they can provide holding of the low-voltage shielding body 3 .
- the retaining webs 28 extend perpendicularly to the housing wall 232.
- the two retaining webs 28, which together form the shielding body mount 25, extend from two different opposite housing walls 232.
- the free area 29 is thus between the retaining webs 28 and a housing wall 232 is formed, from which the holding webs 28 do not extend or which lies between the two housing walls 232, from which the holding webs 28 extend perpendicularly.
- the holding webs 28 also extend, for example, from a common housing wall 232 and thus between the holding webs 28 and the common housing wall 232, from which the two holding webs 28 extend, a free area 29 for holding a low-voltage shielding body 3 can form.
- the holding webs 28 can laterally hold the low-voltage shielding body 3 or, for example, at least one of the holding webs 28 may also be arranged underneath the low-voltage shielding body 3 for holding the same.
- the side describes in particular the type of holder in which, as in the present exemplary embodiment, the holding webs 28 extend from housing walls 232 that lie opposite one another and are preferably parallel to one another.
- shielding plane 421 overhang 35 shielding body part 351 cover layer 5 low-voltage current 36 body part 50 field line
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22718050.2A EP4309197A2 (de) | 2021-03-19 | 2022-03-17 | Niederspannungsabschirmkörper, niederspannungsstromwandler, niederspannungsstromwandleranordnung bzw. niederspannungselektrikanordnung |
DE112022001632.9T DE112022001632A5 (de) | 2021-03-19 | 2022-03-17 | Niederspannungsabschirmkörper, Niederspannungsstromwandler, Niederspannungsstromwandleranordnung bzw. Niederspannungselektrikanordnung |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102021106843.6A DE102021106843A1 (de) | 2021-03-19 | 2021-03-19 | Niederspannungsabschirmkörper, Niederspannungsstromwandler, Niederspannungsstromwandleranordnung bzw. Niederspannungselektrikanordnung |
DE102021106843.6 | 2021-03-19 | ||
DE102021115211.9 | 2021-06-11 | ||
DE102021115211 | 2021-06-11 | ||
DE102021122400 | 2021-08-30 | ||
DE102021122400.4 | 2021-08-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2022194328A2 true WO2022194328A2 (de) | 2022-09-22 |
WO2022194328A3 WO2022194328A3 (de) | 2022-12-15 |
Family
ID=81384834
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2022/100210 WO2022194328A2 (de) | 2021-03-19 | 2022-03-17 | Niederspannungsabschirmkörper, niederspannungsstromwandler, niederspannungsstromwandleranordnung bzw. niederspannungselektrikanordnung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4309197A2 (de) |
DE (1) | DE112022001632A5 (de) |
WO (1) | WO2022194328A2 (de) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0011590A1 (de) | 1978-11-13 | 1980-05-28 | Siemens Aktiengesellschaft | Vollisolierte, metallgekapselte Hochspannungsschaltanlage mit Einleiterstromwandlern |
GB2073499A (en) | 1980-04-02 | 1981-10-14 | Sundstrand Corp | Transformer winding support |
DE1766774C2 (de) | 1967-07-17 | 1982-07-01 | Tektronix, Inc., 97077 Beaverton, Oreg. | Als Anlegewandler zur Messung eines einen elektrischen Leiter durchfließenden elektrischen Stromes für manuellen Gebrauch ausgebildeter Strommeßtransformator |
WO1991019305A1 (en) | 1990-06-01 | 1991-12-12 | Lk Lavspaending A/S | A method and a shield for shielding a current transformer as well as a current transformer including such a shield |
EP1241926A2 (de) | 2001-03-13 | 2002-09-18 | Schulz, Uwe, EMV-tech | Magnetfeldschirmung |
DE10155450A1 (de) | 2001-03-06 | 2002-09-19 | Mitsubishi Electric Corp | Drehstromtransformator vom Baugruppentyp |
EP2700953A2 (de) | 2012-08-23 | 2014-02-26 | Siemens Aktiengesellschaft | Schutzgehäuse für einen Stromwandler sowie Stromwandlermodul |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1287436A (fr) * | 1961-01-30 | 1962-03-16 | Compteurs Comp D | Perfectionnements aux transformateurs de courant pour montage sur barres |
US3962661A (en) * | 1975-04-22 | 1976-06-08 | International Telephone And Telegraph Corporation | Magnetically shunted current transformer |
JPS6119113A (ja) * | 1984-07-06 | 1986-01-28 | Nippon Kinzoku Kk | 変流器 |
JPH09320860A (ja) * | 1996-05-30 | 1997-12-12 | Toshiba Corp | 磁気シールド装置 |
JPH10116741A (ja) * | 1996-10-14 | 1998-05-06 | Toshiba Corp | 静止誘導電器の磁気シールド及びその取付方法 |
US7561387B2 (en) * | 2005-10-19 | 2009-07-14 | Eaton Corporation | Current transformer including a low permeability shunt and a trip device employing the same |
JP5465599B2 (ja) * | 2010-05-17 | 2014-04-09 | 河村電器産業株式会社 | 零相変流器 |
CN103503092B (zh) * | 2011-05-25 | 2016-05-25 | 三菱电机株式会社 | 变压器 |
JP6104373B2 (ja) * | 2013-05-13 | 2017-03-29 | 三菱電機株式会社 | 静止誘導機器 |
JPWO2017002225A1 (ja) * | 2015-07-01 | 2017-06-29 | 三菱電機株式会社 | 変圧器 |
CN105575629B (zh) * | 2016-02-29 | 2018-06-26 | 济南铂晶电子科技有限公司 | 一种改善开口式剩余电流互感器平衡性的方法及其装置 |
KR102153970B1 (ko) * | 2018-12-26 | 2020-09-09 | 엘에스일렉트릭(주) | 기중회로차단기의 변류기 |
-
2022
- 2022-03-17 DE DE112022001632.9T patent/DE112022001632A5/de active Pending
- 2022-03-17 EP EP22718050.2A patent/EP4309197A2/de active Pending
- 2022-03-17 WO PCT/DE2022/100210 patent/WO2022194328A2/de active Application Filing
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1766774C2 (de) | 1967-07-17 | 1982-07-01 | Tektronix, Inc., 97077 Beaverton, Oreg. | Als Anlegewandler zur Messung eines einen elektrischen Leiter durchfließenden elektrischen Stromes für manuellen Gebrauch ausgebildeter Strommeßtransformator |
EP0011590A1 (de) | 1978-11-13 | 1980-05-28 | Siemens Aktiengesellschaft | Vollisolierte, metallgekapselte Hochspannungsschaltanlage mit Einleiterstromwandlern |
GB2073499A (en) | 1980-04-02 | 1981-10-14 | Sundstrand Corp | Transformer winding support |
WO1991019305A1 (en) | 1990-06-01 | 1991-12-12 | Lk Lavspaending A/S | A method and a shield for shielding a current transformer as well as a current transformer including such a shield |
DE10155450A1 (de) | 2001-03-06 | 2002-09-19 | Mitsubishi Electric Corp | Drehstromtransformator vom Baugruppentyp |
EP1241926A2 (de) | 2001-03-13 | 2002-09-18 | Schulz, Uwe, EMV-tech | Magnetfeldschirmung |
EP2700953A2 (de) | 2012-08-23 | 2014-02-26 | Siemens Aktiengesellschaft | Schutzgehäuse für einen Stromwandler sowie Stromwandlermodul |
Also Published As
Publication number | Publication date |
---|---|
EP4309197A2 (de) | 2024-01-24 |
DE112022001632A5 (de) | 2024-01-11 |
WO2022194328A3 (de) | 2022-12-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE112010005769B4 (de) | Transformator | |
DE102017205004B4 (de) | Leistungsschalter | |
DE2424131B2 (de) | Drossel | |
DE112012002028T5 (de) | Drossel, Wandler und Leistungswandler-Vorrichtung | |
DE102017205003B4 (de) | Leistungsschalter | |
EP1598838A2 (de) | Spulenanordnung und Verfahren zu deren Herstellung | |
DE19934767A1 (de) | Magnetisches Bauelement | |
DE112012000806T5 (de) | Drossel, Drosselherstellungsverfahren, und Drosselkomponente | |
DE102005028572B4 (de) | Stromsensoranordung mit einem Magnetkern | |
DE102019109225A1 (de) | PCBA mit Punktfelddetektor und magnetischer Abschirmungsanordnung, die sich auf der gleichen Seite eines Leiters befindet | |
EP1849169A1 (de) | Transformatorkern mit magnetischer abschirmung | |
EP1696444B1 (de) | Summenstromwandler zur allstromsensitiven Erfassung eines elektrischen Differenzstromes | |
EP2546842A2 (de) | Spule zur Strombegrenzung | |
DE102021106843A1 (de) | Niederspannungsabschirmkörper, Niederspannungsstromwandler, Niederspannungsstromwandleranordnung bzw. Niederspannungselektrikanordnung | |
WO2022194328A2 (de) | Niederspannungsabschirmkörper, niederspannungsstromwandler, niederspannungsstromwandleranordnung bzw. niederspannungselektrikanordnung | |
DE102021132350A1 (de) | Niederspannungsstromwandler | |
DE202021102815U1 (de) | Niederspannungsabschirmkörper, Niederspannungsstromwandler, Niederspannungsstromwandleranordnung bzw. Niederspannungselektrikanordnung | |
EP0618451B1 (de) | Stromwandler, insbesondere für einen elektronischen Elektrizitätszähler | |
DE102005020106A1 (de) | Elektromagnet, insbesondere für ein Zugsicherungssystem, und Verfahren zu dessen Herstellung | |
DE102019100517A1 (de) | Spulenkörperschale und Spulenkörper | |
EP1383144B1 (de) | Tauchanker-Vorrichtung | |
DE19710742A1 (de) | Summenstrom-Wandleranordnung | |
DE102019115404A1 (de) | Niederspannungsstromwandler | |
EP3304570A1 (de) | Geräuscharmer spezialtransformator | |
DE19953291A1 (de) | Wickelzahn zur Aufnahme einer Wicklung für den Magnetkreis eines elektro-magneto-mechanischen Wandlers, Blechpaket sowie elektro-magneto-mechanischer Wandler |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22718050 Country of ref document: EP Kind code of ref document: A2 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 112022001632 Country of ref document: DE Ref document number: 2022718050 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2022718050 Country of ref document: EP Effective date: 20231019 |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: R225 Ref document number: 112022001632 Country of ref document: DE |