DE102010034102B4 - Electrical installation device with summation current transformer - Google Patents

Abstract

Electrical installation device (1) for monitoring a circuit, - with a first housing (5), - with a in the first housing (5) arranged summation current transformer (20), - wherein the summation current transformer (20) has a toroidal core through which a neutral conductor and at least a phase conductor are passed, and a second housing (22) in which the annular band core is received, characterized in that - in a first side wall (7) of the first housing (5), a first opening (10) is formed, - second housing (22) has a first projection (23) which is received in the first opening (10) such that a part of an outer surface of the first housing (5) is formed by the first projection (23) formed on the second housing (22) is formed.

Description

The invention relates to an electrical installation device for monitoring a circuit having a summation current transformer, which is designed to detect a differential current between at least one phase conductor and a neutral conductor.

In electrical installation technology, suitable devices, such as residual current circuit breakers or residual current circuit breakers, are used to detect a so-called residual current, in order to protect persons from the dangers that can arise when touching live parts of electrical installations. To protect against such dangers summation current transformer are used, with the aid of the differential current can be detected. Residual currents can occur if, for example, faulty insulation or, in the case of contact, a fault current flows through the human body against earth. To detect such a differential current, the magnitude of the current in a line leading to an electrical consumer, for example a phase line, is compared with the magnitude of the current in a line, for example a neutral conductor, which is returned by the electrical consumer. In the fault-free state, the sum of the electrical currents flowing to the consumer is equal to the sum of the returning electrical currents; It follows that the signed sum of the electrical currents in the forward and return lines in the zero-fault state is equal to zero.

To detect a differential or fault current, a so-called summation current transformer is used, with the aid of which the currents flowing to the consumer as well as the currents flowing back from the load of a circuit vectorially, d. H. directional or signed, to be added. Flows at any point within the circuit current to earth from, so the sum of the current flowing back and forth flowing in the summation current transformer is not equal to zero. The resulting current difference leads to the triggering of the electrical installation device and as a result to the shutdown of the corresponding circuit.

A summation current transformer consists essentially of a magnetic core, which is usually annular. The magnetic cores are usually wound from strip material of crystalline or nanocrystalline soft magnetic tape, they are therefore also referred to as "ring band cores". During production, the strip material was attached to a mandrel and then wound up to the nominal thickness of the ring band core. By pulling out the cylindrical winding mandrel, the ring band core was obtained. In order to achieve the necessary for triggering the electrical installation device power, however, a certain size and a certain mass of the toroidal core are required.

In German standardization, the terms "residual current circuit breaker" (FI) are used for mains-voltage-independent devices and differential current circuit breakers (DI) for mains-voltage-dependent devices. Such a distinction in mains voltage-independent and mains voltage-dependent electrical installation equipment is no longer made in English-speaking standards and in today's standard IEC and EN standards. In these recent regulations for electrical installations, residual current circuit breakers are uniformly managed under the superordinate term "RCD" (Recidual Current Device). The terms "differential current" and "fault current" are therefore used synonymously in the present description.

From the prior art, a plurality of electrical installation devices is known, which have a summation current transformer for detecting a difference or a fault current. In larger electrical installation equipment, the summation current transformer can be tubular or disk-shaped. In smaller devices, this is not readily possible, since the ring core of the summation current transformer to achieve the required tripping power requires a certain size, which is a use in small electrical installation equipment, for example, in low-voltage modular devices with a width of only one division unit (1 TE = 18 mm ). For this reason, only disc-shaped band cores are used in these narrow DIN rail mounted devices with a width of one division unit, which can be installed lying in the DIN rail mounted device due to their diameter, which usually exceeds the level of a division unit. However, this leads to an increased space requirement of the summation current transformer in the housing of the DIN rail mounted device, which makes the arrangement of the other functional modules of the electrical installation device significantly more difficult.

It is therefore the object of the present invention to provide an electrical installation device with a summation current transformer for monitoring a circuit for detecting a differential current, which is characterized by a summation current transformer, which allows a higher release capacity with the same volume and therefore also for use in a narrow electrical installation device suitable.

This object is achieved by the electrical installation device according to the invention independent claim 1 solved. Advantageous embodiments are the subject of the dependent claims.

The electrical installation device according to the invention for monitoring a circuit has a first housing and a summation current transformer arranged in the first housing. The summation current transformer has a toroidal core through which a neutral conductor and at least one phase conductor are led, as well as a second housing in which the toroidal core is accommodated. In this case, a first opening is formed in a first side wall of the first housing. Furthermore, the second housing has a first Anformung, which is received in the first opening such that a part of an outer surface of the first housing is formed by the second housing formed on the first formation.

The second housing of the summation current transformer is a so-called partitioning, which receives the toroidal core in itself, holds in a defined position and protects against environmental influences. This partition is shaped such that it protrudes in the mounted state of the electrical installation device in the first opening. Advantageously, the partition closes flush with an outer surface of the first housing. This results in the advantage that the summation current transformer and thus the ring band core can be dimensioned slightly larger, so that the required tripping power is achieved. Thereby, a use of such a summation current transformer is made possible even in narrow electrical installation devices with a width of only one division unit. The packaging, that is to say the spatial arrangement of the further components accommodated in the housing of the electrical installation device, is thereby considerably simplified.

In an advantageous further connection of the electrical installation device, the first Anformung a first centering edge, which cooperates with the first opening such that the summation current transformer is centered and supported in a predefined position in the first housing.

In this way, the summation current transformer is simultaneously held and centered via the first recess formed in the first opening, so that further fastening and / or adjustment means-for example corresponding receptacles in the interior of the housing-can be dispensed with. The structural design of the housing is thereby significantly simplified. Also, instead of rigid phase and neutral conductors, which are usually used in conventional electrical installation devices for fixing the summation current transformer in the housing of the electrical installation device, flexible strands are passed through the summation current transformer, since the fixation on the arrangement of the housing of the summation current transformer in the first side wall formed first opening of the electrical installation device. As a result, the assembly is greatly facilitated; the installation effort is significantly reduced.

In a further advantageous connection of the electrical installation device, the first opening is completely closed by the first Anformung. As a result, the interior of the electrical installation device from environmental influences, such as dust, safely protected.

In a further advantageous further connection of the electrical installation device, the first opening and the associated first molding are formed rectangular. In a further advantageous further connection of the electrical installation device, the first opening and the associated first Anformung are triangular. Rectangle and triangle represent easy to manufacture embodiments for the first opening or for the first Anformung and allow secure fixation or adjustment of the summation current transformer in the housing of the electrical installation device. In principle, regular polygons such as pentagon or hexagon as well as irregular polygonal shapes are also suitable as the shape for the first opening or for the first formation.

In a further advantageous connection of the electrical installation device, a second opening is formed in a second side wall of the first housing. The second housing has a second Anformung, which is accommodated in the second opening such that a part of the outer surface of the first housing is formed by the formed on the second housing second Anformung.

In a further advantageous connection of the electrical installation device, the first opening and the second opening are arranged opposite one another. Accordingly, the first Anformung and the second Anformung the summation current transformer are arranged opposite to each other. This arrangement is characterized by an increased stability during storage of the summation current transformer in the first housing.

In a further advantageous further connection of the electrical installation device, the second Anformung a second centering edge, which cooperates with the second opening such that the summation current transformer is additionally centered and supported on the arranged in the second side wall second Anformung. This results in the advantage that the summation current transformer on both sides, that is, both on the first opening formed in the first side wall, as well as on the in the first side wall second side wall formed second opening, centered and held. In this way, a stable fixation of the summation current transformer within the housing without additional fastening and / or adjustment means can be realized.

In a further advantageous further connection of the electrical installation device of the annular band core is disc-shaped or tubular. Disc-shaped toroidal cores are used, inter alia, when the available, limited space does not allow tubular annular band cores. However, a tubular annular band core is generally less expensive to produce than a disc-shaped annular band core and allows for the same volume of construction a higher release performance.

In a further advantageous further connection, the electrical installation device is designed as a residual current circuit breaker or as a differential current circuit breaker.

Residual current circuit breaker and residual current circuit breaker have in addition to a detection unit for detecting a differential current, to which the summation current transformer counts, nor a switching mechanism and at least one contact point for the phase conductor. When a differential current occurs, a trigger pulse is generated, which causes an interruption of the phase conductor via the switching mechanism. In so-called 1 + N switches usually two contact points are present, so that the triggering pulse of the detection unit due to a differential current through the switching mechanism and the neutral conductor is interrupted. Furthermore, three-phase devices with four contact points are possible, so that when a differential current occurs, both the three phase conductors and the neutral conductor are interrupted.

In a further advantageous further connection, the electrical installation device is designed as a residual current release or as a differential current release. Residual current releases and residual current releases are pure trip units which do not have their own contact points for interrupting the phase conductor and / or the neutral conductor. They are only used to detect a differential current and to generate a triggering pulse, which is transferable via a suitable coupling to a switching device, for example to a circuit breaker.

In a further advantageous further connection, the electrical installation device with a switching device, which has at least one switching point, coupled in such a way that when the electrical installation device via the coupling opening of the at least one switching point is effected. The coupling may be formed mechanically, for example; In this case, it makes sense to arrange the residual current or residual current release and the switching device immediately adjacent. Such a coupling makes it possible to retrofit an already existing switching device with a residual current tripping unit in a simple manner.

In a further advantageous further connection, the first housing is divisible in a longitudinal plane and / or in a transverse plane. This results in the advantage that the choice of one or even more parting planes, in which the housing parts are connected to each other, is adaptable to the requirements of the packaging as well as the ability to mount. The logistics, assembly and production costs are thereby positively influenced.

In a further advantageous further connection, the electrical installation device has a maximum width of a dividing unit defined for attachment to a support element. The electrical installation devices are usually mounted on a support element, for example on a support rail or DIN rail, which is mounted in an electrical installation distributor. In such electrical distribution manifolds, which are also referred to as a distribution box or simply as a distributor, are usually limited space, as in the distribution box a variety of switching devices, such as circuit breaker or residual current circuit breaker must be mounted. In these cases, narrow designs are preferred for the electrical installation equipment, as this several switchgear can be mounted in a predefined space. The division unit results from the length of the support element and the number of electrical installation devices that are to be mounted on the support element within this length. In the field of electrical installation technology for low-voltage switchgear, this minimum graduation unit is 18 mm as standard.

In the following, embodiments of the electrical installation device will be explained in more detail with reference to the accompanying figures. In the figures are:

1A and 1B schematic representations of a first embodiment of the electrical installation device according to the invention;

2A and 2 B schematic representations of a second embodiment of the electrical installation device according to the invention;

3A and 3B schematic representations of a first embodiment of the summation current transformer;

4 a schematic representation of a second embodiment of the summation current transformer.

In the various figures of the drawing, like parts are always provided with the same reference numerals. The description applies to all drawing figures in which the corresponding part can also be recognized.

The 1A and 1B schematically show a first embodiment of the electrical installation device according to the invention 1 which is in 1A is shown in the assembled state. The electrical installation device 1 has a housing 5 with a first housing part 6 on which a first sidewall 7 includes. The first housing part 6 which is in 1B is shown in detail, is via an intermediate element 4 with a second housing part 8th to a housing 5 connected. The connection of the housing parts 4 . 6 and 8th is realized on the one hand via snap-in connections: this has the intermediate element 4 several locking lugs 14 on, which associated with them, on the first housing part 6 and the second housing part 8th trained snap shots 15 each form a latching connection. For another, in the first sidewall 7 of the first housing part 6 and in a second side wall of the second housing part 8th Nietaufnahmen 12 formed in the form of a plurality of through holes, through which the housing parts can be additionally riveted together.

The electrical installation device 1 has an operating element on a front side 2 on, about the electrical installation device 1 is manually operated. Furthermore, there is a test button on the front 3 arranged with the help of an operator, the functionality of the electrical installation device 1 can test. Furthermore, on the housing 5 in the area of the operating element 2 Plombieröffnungen 13 formed, in which a closure element can be inserted, which is the manual operation of the electrical installation device 1 via the operating element 2 blocked. The electrical installation unit is located on the back opposite the front 1 on a support element, for example, a support or DIN rail mounted in a distribution box (not shown), mountable.

The housing 5 is according to the representation of 1A designed in three parts and points in this case next to the first housing part 6 and the second housing part 8th the intermediate element 4 on. This allows for mounting in which the individual components of the electrical installation device 1 in the intermediate part 9 can be used, which then with two "covers" - in the form of the first housing part 6 and the second housing part 8th - is lockable. However, it is also possible the housing 5 only in two parts - so without using an intermediate part to perform: in this case, the individual components of the electrical installation device 1 in the first housing part 6 or in the second housing part 8th inserted and then together with each other to the housing 5 mounted, for example by suitable locking, riveting or screw.

In the first sidewall 7 of the first housing part 6 is an opening 10 formed such that a second housing 22 a summation current transformer 20 (please refer 3A . 3B and 4 ) is centered and held in it. It forms in the opening 10 arranged part of the second housing 22 of the summation current transformer 20 a part of an outer surface of the first housing 5 of the electrical installation device 1 , By the second housing 22 of the summation current transformer 20 not within the first housing 5 of the electrical installation device 1 must be arranged, but partly in the sidewall 7 trained first opening 10 protrudes and centered there and is supported, the diameter of the summation current transformer 20 - At constant wall thickness of the housing 22 , which is the bulkhead of the ring band core of the summation current transformer 20 represents - be made slightly larger, in order to achieve the required tripping power.

The 2A and 2 B show schematically a second embodiment of the electrical installation device according to the invention 1 , each in perspective view. The electrical installation device 1 is made in two parts, with the first housing part 6 ' represents a floor assembly which is fastened to a support member, such as a DIN rail. The first housing part 6 ' forms together with the second housing part 8th' the housing 5 ' of the electrical installation device 1 , On the second housing part 8th' , which represents an operating page, is the operating element 2 arranged, with the help of the electrical installation device 1 is manually operated. In the floor assembly, in the assembly of the electrical installation device 1 the individual components are inserted, has a first side wall 7 ' with a first opening formed therein and one opposite the first side wall 10 ' as well as a second side wall 9 ' with a second opening formed therein 11 ' on. The first opening 10 ' and the second opening 11 ' are designed such that therein the second housing 22 of the summation current transformer 20 (please refer 3A . 3B and 4 ) can be centered and held.

In the 3A and 3B is a first embodiment of the summation current transformer 20 shown schematically. The summation current transformer 20 has a two-part second housing 22 on, which consists of the two housing halves 22A and 22B consists. 3A shows the summation current transformer 20 in the assembled state. The housing halves 22A and 22B are over several locking element pairings, consisting of one locking lug 29A and one of the respective catch 29A associated locking edge 29B latched together. For exact positioning of the two housing halves 22A and 22B these have several Zentrierelement pairings in the region of their contact surface 28A and 28B on. These are as pin connections, each with a centering pin 28A and one, the respective centering pin 28A associated mortise 28B , educated. The second housing 22 of the summation current transformer 20 provides a containment for one in the housing 22 male ring core (not shown) of the summation current transformer 20 represents.

3B shows the case half 22B of the first embodiment schematically in perspective view, which provides an insight into the interior of the housing half 22B allows. Inside the case half 22B is a peg-shaped recording 27 formed, which the toroidal core of the summation current transformer 20 receives and in a defined position in the housing 22 holds. Furthermore, in this view is a connection surface 21 to recognize which in the assembled state of the housing 22 the contact surface of the two housing halves 22A and 22B represents. In the area of the connection area 21 are the centering pin 28A a first centering element pairing and the pin hole 28B formed a second centering element pairing. Furthermore, in the area of the connection surface 21 the respective elements of two locking element pairs, the locking lug 29A a first locking element pairing and a further locking element pairing associated locking edge 29B educated.

In the presentation of the 3B are also the first impression 23 with the first centering edge formed thereon 24 and the second Anformung 25 with the second centering edge formed thereon 26 to recognize. In the area of the first molding 23 and the second Anformung 25 reaches the wall thickness of the housing 22 their minimum value. However, the wall thickness is sufficiently dimensioned at this point in order to protect it as a partition of the ring band core this safe. By the moldings 23 and 25 in openings, which are in the side walls of the housing 5 of the electrical installation device 1 are received and centered while doing a part of the outer surface of the housing 5 form, the space available for the annular band core space can be increased, without doing the predetermined by the dividing unit maximum width of the electrical installation device 1 To exceed.

4 schematically shows a second embodiment of the summation current transformer 20 , In contrast to the representations in the 3A and 3B is that in 4 illustrated housing 22 ' of the summation current transformer 22 not divided into two symmetrical housing halves, but consists of a first housing half 22A ' , which are hollow cylindrical and formed with a second housing half 22B ' can be closed in the form of a lid. Inside the case 22 ' In turn, a pin-shaped receptacle is formed, which the ring band core of the summation current transformer 20 receives and in a defined position in the housing 22 ' holds. Incidentally, the structural design of the second housing corresponds 22 ' essentially the one in the 3A and 3B illustrated housing.

LIST OF REFERENCE NUMBERS

1

Electrical installation equipment

2

operating element

3

test button

4

intermediate element

5, 5 '

first housing

6, 6 '

first housing part

7, 7 '

first sidewall

8, 8 '

second housing part

9 '

second side wall

10, 10 '

first opening

11 '

second opening

12

rivet receptacle

13

Plombieröffnung

14

locking lug

15

latching receptacle

20

Summation current transformer

21

terminal area

22, 22 '

second housing

22A, 22A '

first half of the housing

22B, 22B '

second housing half

23

first formation

24

first centering edge

25

second impression

26

second centering edge

27

peg-shaped receptacle

28A

spigot

28B

mortise

29A

locking lug

29B

catch edge

Claims (14)

Electrical installation device ( 1 ) for monitoring a circuit, - with a first housing ( 5 ), - with one in the first housing ( 5 ) arranged summation current transformer ( 20 ), - wherein the summation current transformer ( 20 ) has a toroidal core through which a neutral conductor and at least one phase conductor are passed, and a second housing ( 22 ), in which the toroidal core is received, characterized in that - in a first side wall ( 7 ) of the first housing ( 5 ) a first opening ( 10 ), - that the second housing ( 22 ) a first formulation ( 23 ), which in the first opening ( 10 ) is received such that a part of an outer surface of the first housing ( 5 ) from the second housing ( 22 ) first formed ( 23 ) is formed. Electrical installation device ( 1 ) according to claim 1, characterized in that the first Anformung ( 23 ) a first centering edge ( 24 ), which with the first opening ( 10 ) cooperates in such a way that the summation current transformer ( 20 ) in a predefined position in the first housing ( 5 ) is centered and held. Electrical installation device ( 1 ) according to one of the preceding claims, characterized in that the first opening ( 10 ) by the first formation ( 23 ) is completely closed. Electrical installation device ( 1 ) according to one of claims 1 to 3, characterized in that the first opening ( 10 ) and the associated first formation ( 23 ) are rectangular. Electrical installation device ( 1 ) according to one of claims 1 to 3, characterized in that the first opening ( 10 ) and the associated first formation triangular ( 23 ) are formed. Electrical installation device ( 1 ) according to one of the preceding claims, characterized in that - in a second side wall ( 9 ' ) of the first housing ( 5 ) a second opening ( 11 ' ), - that the second housing ( 22 ) a second embodiment ( 25 ), which in the second opening ( 11 ' ) is received such that a part of the outer surface of the first housing ( 5 ) from the second housing ( 22 ) formed second Anformung ( 25 ) is formed. Electrical installation device ( 1 ) according to claim 6, characterized in that the first opening ( 10 ) and the second opening ( 11 ' ) are arranged opposite one another. Electrical installation device ( 1 ) according to one of claims 6 or 7, characterized in that the second Anformung ( 25 ) a second centering edge ( 26 ), which communicates with the second opening ( 11 ' ) cooperates in such a way that the summation current transformer ( 20 ) in addition to the in the second opening ( 11 ' ) arranged second molding ( 25 ) is centered and held. Electrical installation device ( 1 ) according to one of the preceding claims, characterized in that the annular band core is disc-shaped or tubular. Electrical installation device ( 1 ) according to one of claims 1 to 9, characterized in that the electrical installation device ( 1 ) is designed as a residual current circuit breaker or as a residual current circuit breaker. Electrical installation device ( 1 ) according to one of claims 1 to 9, characterized in that the electrical installation device ( 1 ) is designed as a residual current release or as a residual current release. Electrical installation device ( 1 ) according to claim 11, characterized in that the electrical installation device ( 1 ) with a switching device which has at least one switching point, can be coupled in such a way that upon triggering of the electrical installation device ( 1 ) An opening of the at least one switching point is effected via the coupling. Electrical installation device ( 1 ) according to one of the preceding claims, characterized in that the first housing ( 5 ) is divisible in a longitudinal plane and / or in a transverse plane. Electrical installation device ( 1 ) according to one of the preceding claims, characterized in that the electrical installation device ( 1 ) has a maximum width of a defined for attachment to a support member division unit.

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