DE7722434U1 - CURRENT CONVERTER ARRANGEMENT - Google Patents

Description

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BBC Aktiengesellschaft Brown, Boveri & Cie., Baden (Switzerland)

The invention relates to a current transformer arrangement, in particular for connection to the secondary winding of a upstream main current transformer. Such converter arrangements are, for example, to a large extent in the electrical Mains protection technology as connecting links between the high-current side main current transformers and protective relays used in various ways. The current transformer of the arrangement then provides an input current transformer of the relay circuit represent.

In the case of current transformer arrangements of the aforementioned type, the primary winding in particular only exists from a single turn or a conductor passing through the toroidal core, which in turn is in the secondary circuit of the upstream main converter is located. This requires special requirements with regard to the connection, because the secondary circuit of the upstream main transformer in the

Current transformer arrangement I

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drive must not be separated, so · a secure contact connection is absolutely necessary. At the same time there is an easy-to-use, detachable connection between the toroidal core or input converter and the upstream main converter are desirable. The object of the invention is therefore Creation of a current transformer arrangement, which can be easily engaged and released, primary-side connection characterized by reliable contact and simple structural design. The inventive The solution to this problem is characterized by the features specified in claim 1. The connection plug-and-socket device provided thereafter, which engages the end sections of the guide body, enables the desired simple one Handling, wherein the guide body reaching through the toroidal core has an advantageously simple and robust structure of the Allows primary winding with its contact elements.

The features and advantages of the invention are further illustrated by the exemplary embodiment shown in the drawings explained. Herein shows

1 is a perspective view of a multiple current transformer assembly with connection plug device,

2 shows a toroidal core converter in axial section with the associated connection plug-in device,

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2a shows a construction element of the connecting plug-and-socket device that is modified with respect to the embodiment according to FIG. 2 and

3 shows a particular embodiment of a toroidal core converter in a perspective view.

It should be said in advance that in the present context the term "toroidal core converter" is to be understood in a comprehensive sense is and possibly also composite core designs in the manner of a cut ribbon core or the like includes.

According to FIG. 1, a plurality of toroidal core converters RW, each with a coaxial guide body LK as the primary winding, are arranged on a circuit board serving as a carrier T. An associated connection connection comprises a connection plug-in device ST with a pair of contact arms KA ₁ , KA for each converter RW LK at.

2G These guide body end sections thus form the one with the plug-in device connecting contact elements of the primary winding of each converter. The conditions are in each can be seen from Fig. 2, the arrangement as in

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Fig. 1 is indicated in the disengaged rest position. The contact element end sections KE and KE each have one Annular groove for engaging the fork-like contact arm end sections KAE, KAE. This results in an excellent safe electrical and mechanical connection, 1 which is particularly important with regard to the occurrence of overcurrents Force effects is essential.

In general, a two-sided construction of the end portions of the guide body can LK having the effect of contact elements in connection with a fork-like arrangement of the contact arms of the connector I regarded as practical be \. In principle, however, there is also a unilateral § '

Consider application of the construction elements shown, | where in another way the one mutual connection of the I.

\ Primary winding is to be taken care of.

In the modified version of a contact arm end section ί

KAE this sits in the connection position indicated by dashed lines 2a on the end face on a contact element end section of the guide body serving as the primary winding on. This results in comparatively large spring travel for

the interacting contact elements, which is advantageous in some cases.

In the manner shown in Fig. 1 is between the contact arms KA and KA of the connector ST one in disengaged Rest position closed, in engaged connection

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On the other hand, open contact switch KS position is provided, which automatically short-circuits the secondary circuit of an upstream main current transformer when the connection is released. In the example, the contact switch is formed in an advantageously simple manner by switching _{sections KAS 1} , KAS- of the contact arms which are spring-loaded against one another. When this contact switch is opened, the contact arms or in any case their switching sections KAS, KAS assume a spreading position which, in the embodiment according to FIG. 2, is forced by the engagement of an isolating element TR between the contact points of the switch. This separating member is in turn designed in an advantageously simple manner as an edge section of the circuit board carrying the transducers. The insulating material of the circuit board ensures that the short-circuiting contacts are reliably separated when the plug-in connection is engaged. In the modification according to FIG. 2a, the spreading position of the contact arms is achieved by the frontal]

Sitting on the contact arm end sections on those of the Conductor LK causes.

As can be seen from FIG. 2, the secondary winding SW of a converter is arranged in the manner of a toroid on the toroidal core RK. To now a particularly simple and space-saving electrical connection between the secondary winding and the connection circuit - in general a printed circuit - to produce on the 5 carrier T is on the toroidal core RK in the off

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Fig. 3 shows a sector-like connection device with solderable contact pins S arranged. the Secondary winding SW extends over a corresponding remaining sector of the toroidal core. Has such a design furthermore the advantage that the interior of the toroidal core is freely accessible for the insertion of the bolt-like guide body remains.

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Designation list

RW toroidal core converter

RK toroid to RW

SW secondary winding to RW

LK guide body

KE, KE ₁ , KE ₂ Contact element end sections for LK

ST connection plug-in device

KA ₁ , KA ₂ contact arms for ST

KAE, KAE ₁ , KAE ₂ End sections of KA, KA

KS contact switch

KAS ₁ , KAS ₂ Contact arm switch sections for KS

T carrier to RW

TR separator at T to KS

AV connection device to RW

S contact pins

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Claims (10)

forms are. BBC bathing claims 1. Current transformer arrangement, in particular for connection to the secondary winding of an upstream main current transformer , characterized by at least one toroidal core converter (RW) with a toroidal core (RK) reaching through, Conductor body (LK) provided as the primary winding, the end sections of which on both sides (KE, KE) serve as contact elements Yes <£ elements for a connection plug-in device (ST) 2. Current transformer arrangement according to claim 1, characterized shows that the connection plug-in device (ST) has at least one contact arm (KA ₁ , KA ₃ ) which forms a resilient latching connection with an associated contact _{element end section (KE 1} , KE) of a guide body (LK). 3. Current transformer arrangement according to claim 2, characterized in that the guide body (LK) has at least one protruding contact element end section (KE, KE) and that the connection plug-in device (ST) has at least one fork-like contact arm (KA, KA) which an associated contact element · end section (KE ₁ , KE _? ) of the guide body (LK) resiliently engages. 4. Current transformer arrangement according to claim 3, characterized BBC Baden, ........ • 4 « · ν J , 9 C 7, ^ t« « _ν « * · · ^ J U ■ shows that an annular groove is provided on at least one contact element end section (KE, KE) of the guide body (LK) as a receptacle for the fork ends of an associated contact arm (KA ₁ , KA "). 5. Current transformer arrangement according to one of claims 1 to 4, characterized by a connection plug-in device (ST) with at least one resilient contact arm (KA, KA) in the longitudinal direction of the guide body (LK), which is in the Connection position of the plug-in connection with contact being made on the assigned contact element end section (KE, KE) of the guide body (LK) is seated at the front. 6. Current transformer arrangement according to one of the preceding claims, characterized in that the connection plug-in device (ST) for each one toroidal core converter (RW) with associated guide body (LK) is a fork-like design Has contact arm pair (KA, KA), the end sections (KAE ^, KAE ") in the connection position of the plug-in device (ST) take a spread position, and that between the contact arms (KA, KA) of a pair a contact switch (KS) is arranged, which is open in the connection position of the connector and in the disengaged Rest position of the connector is closed. 7. Current transformer arrangement according to claim 6, characterized BBC Baden shows that the contact switch (KS) is caused by switching sections (KAS, KAS_) of the Contact arm pair (KA, KA) is formed. 8. Current transformer arrangement according to claim 6 or 7, marked ι t net by a with a carrier (T) at least one ring | core converter (RW) connected isolating element (TR), which engages in the connection position of the plug device (ST) in the contact switch (KS). 9. Current transformer arrangement according to claim 8, characterized in that an edge section is used as a carrier (T) serving circuit board is provided as a separator (TR) for the contact switch (KS). 10. Current transformer arrangement according to one of the preceding claims, characterized by a sector-like design, connection device connected to the toroidal core (RK) AV
tion / and by a secondary winding (SW) extending within a corresponding residual sector of the toroidal core (RK). BBC Public Company Brown, Boveri & Cie.