DE7636057U1 - Residual current circuit breaker designed as an adapter plug with test device - Google Patents

Description

Applicant: Feiten & Guilleaume
Carlswerk AG
5000 Ko "" η 80
Schanz ens + .raße

Fl 4354a

Ko / Wz 5 Cologne-Mülheim, November 12, 1976

Residual current circuit breaker designed as an adapter plug
with test facility ___

The invention relates to a connector designed as an adapter
Fault current protection switch, consisting of a circuit breaker designed as a plug and a multiple socket connected to it, with a test device housed in a cubic housing part.

It is already known to accommodate elements of residual current circuit breakers in safety plugs (DT-PS 22 04 418). Such safety plugs, which work according to the principle of residual current protection, are used as consumers between the power network and one or more electrical devices. Task of
Residual current circuit breaker is to measure the sum of the currents flowing in and out of one or more connected electrical devices, which is normally zero. However, if there is a difference between the incoming and outgoing currents, which is caused by a

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Leakage current to earth or to the earthed protective conductor arises, so the residual current circuit breaker disconnects the circuit via built-in switching contacts at a certain level of leakage current and thus avoids any danger to all those who come into contact with the electrical device (s). The earthed protective contacts in the power supply socket used are normally used as a reference point for the earth potential. An extension of the protective effect is achieved in that a winding arrangement of the summation current transformer that responds to fault currents is also arranged in the protective conductor circuit, possibly with the addition of voltage-dependent resistors (DT-PS 1 809 02b).

In special cases it is desirable to be able to control the protective effect of such residual current circuit breakers at any time, specifically with regard to a sufficient earthing quality of the protective conductor. This check of the earthing quality of the protective conductor has previously required test devices specially created for this purpose. But do they have the kachteil, at the input? plug-in residual current protective devices are not available because, apart from the impossibility of having such devices operated by laypeople, the effort would not be justified.

The invention is therefore based on the object in one with one Residual current circuit breaker provided circuit a test device for the control of the earthing quality possible at any time Provide protective conductor without major housing expense.

The object is achieved according to the invention in that in the bottom part of the housing the components for the test facility of the Protective conductor, such as test contacts, voltage divider, rheostat and measuring instrument are arranged that the front panel is a test button for the contacts, a control button for carries the Hegel resistance and a scale of the measuring instrument, and that on the front wall of the multiple socket a socket for one Replacement protective conductor is attached.

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The advantages achieved by the invention are that the test device according to the invention consists of only a few components exists, which can be accommodated in the housing without much difficulty let that already have devices for a residual current circuit breaker.

Advantageous embodiments of the subject matter of the main claim are to be found in subclaims 2 and 3.

An embodiment of the invention is shown in the drawing and is described in more detail below. Show it:

Pig 1 has an adapter plug with a multiple socket, the multiple socket containing the test device

Fig. 2 a pluggable residual current circuit breaker and downstream Multiple socket with this circuit

Fig. 3 shows a pluggable residual current circuit breaker with a downstream Multiple socket, whereby the circuit is housed in the housing of the residual current circuit breaker.

Fig. 1 shows an adapter 1 with built-in residual current protection circuit (only partially shown), which is connected to the power supply via a feed socket 2. The power network has an outer conductor R, a neutral conductor (or center conductor) Mp and a protective conductor SL. The neutral conductor and protective conductor are each grounded individually or together. The adapter plug 1 is connected to a multiple socket 4 via a connecting line 3. Outer conductor R and neutral conductor Mp are led to a voltage divider 6 via contacts 5 of a test button PT. A regulating resistor 7, to which a measuring instrument 8 is connected in parallel, is connected to the midpoint of this voltage divider. The common base point of the rheostat and the measuring instrument is connected to the protective conductor SL and is also connected to a terminal 9 which is led to the outside and to which an auxiliary earth (substitute protective conductor) with its earthing resistor 10 can be applied.

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In Fig. 2 is one of the circuit arrangement of FIG. 1 corresponding Device arrangement shown. Here, the same reference numerals apply, and 11 also denotes the scale of the measuring instrument and with U the control button for the rheostat.

According to Fig. 3 is the Schaltungsar order of the test circuit in the housing of the safety plug 1. Otherwise, the same reference numerals apply as before.

The functioning of the entire device arrangement is as follows: By pressing the test button PT, the voltage divider 6 is connected to the mains voltage via the contacts 5. At the midpoint of the voltage divider, half the mains voltage is connected to earth, in any case, regardless of the polarity with which the plug is connected to the socket. The advantage of using this voltage divider in the circuit is that in the extreme case never more than that during the test process

ilel-LDe 1100 ^ 0 ^ 0 ^ 11x1x11 ^ cij.s jjcx uj.11 uji £, acnjcxiiiiu.ii £ 3 »uncii λ-uiui. i-1-11 uituwn fiiii telpuiiki. ües öptiiuiuiiga beilei-ä 6 lieg ^ ^uxc ivexueji.siuiicxx », ujiö tsxiieci continuously variable rheostat 7 with the earth resistance of the protective conductor SL or with the earth resistance 10 of the substitute protective conductor. If the internal resistance of the voltage divider 6 is neglected, half the mains voltage is accordingly distributed between the two resistors, of which one 7 can be changed from very large values to very small values and the other is unknown. The measuring instrument 8, which is designed as a high-resistance voltmeter and displays the voltage drop across this resistor, is located parallel to the control resistor 7. With an earth resistance of zero ohms, for example, the total voltage at the control resistor 7 drops, the maximum display of the measuring instrument 8 thus means a good earth. With an earthing resistance of e.g. 2000 ohms, the pointer of the measuring instrument 8 will decrease depending on the set value of the rheostat 7, since the voltage

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I * ¹ ! 4 354a - 5 - ι 2.11.76

The voltage drop across the variable resistor 7 is reduced by the amount of the voltage drop across JSrdungswiaerstund. This voltage drop arn Hogelwiderstand Y is thus an inversely proportional value _for contact voltage occurring at the ground resistance. The ükalu H of the measuring instrument 8 can therefore, assuming constant mains voltage, be calibrated directly in contact voltage. By specifying a maximum permissible contact voltage (eg 50 V), the earthing resistance can be determined according to Ohm's law.

• 5, In cooperation with the one located at the entrance of the entire arrangement, after learning principle of the FI protection functioning safety plug 1 can still be achieved that during the Test sequence, the current, which increases when regulating the variable resistor 7, can never be greater than the nominal trigger value of the Safety plug 1, e.g. 30 mA, because if this current is exceeded, safety plug 1 triggers and thus the circuit interrupts.

The procedure for the functional test is as follows: First, with the control resistor fully switched on, 7 is applied to pressure on the test button PJ? only a small stream from the central p? uakt des Voltage divider 6 via the protective conductor SL or via the grounding Jl resistance 10 of the replacement protective conductor flow to earth. The measuring instrument 8 still shows practically full deflection. With subsequent Down regulation of the rheostat 7 is, especially be ^ a ground with higher resistance, the meter pointer decrease steadily and with it the contact voltage at the earthing resistor Show. In the case of a bad, i.e. too high-resistance earth, the pointer of the measuring instrument δ will become dangerous.

de touch voltage / show and thus signal that the

^: Earth resistance must be reduced. With a sufficiently good earth, on the other hand, when regulating resistor 7 is reduced, the displayed voltage drop is only small s ^ in and the

Switched safety plug 1 will trigger before a dangerous ί borrowed contact voltage is reached.

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Pl 4354a - 6 - ^: 11/12/76 I.

_{ With these criteria, the statement that the grounding is sufficiently * good is clear. The advantage of this combination is that despite the simple operation, an exact test of the protective function is given and also, due to the action of the safety plug 1, a dangerously high current can never flow through a person to earth even during the test process. In order to simplify operation and reading, the scale of the measuring instrument 8 does not need a scale setting and numbers, but simply two colored fields for "good" and "bad".

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Claims (3)

Fl 4354a \ d. \ \. γο claims for protection: j 1. Fault current circuit breaker designed as an intermediate plug, consisting of a circuit breaker designed as a plug and an associated multiple socket, with a test device housed in a cubic housing part, characterized in that in the bottom part of the housing the components for the test device of the protective conductor (SL), such as test contacts (5), voltage divider (6), rheostat (7) and measuring instrument (8) are arranged so that the front panel in front has a test button (PT) for the contacts, a control button (12) for ₍ the rheostat and a scale ( Ή) of the measuring instrument i, and that a socket (9) for a replacement protective conductor is attached to the front wall of the multiple socket (Pig. 1 and 3) 2. Circuit breaker according to claim 1, characterized in that that it is designed as a plug on the back, that the testing device of the protective conductor (SL) is arranged in the bottom part of the switch housing, and that the connection line (3) to the multiple socket in its bottom plate (4) is performed (Fig. 1). 3. Circuit breaker according to claim 1, characterized in that that it is designed as a plug on its back, that the connection line (3) in its base plate is led to the multiple socket (4), and that the test device the protective conductor is arranged in the front part of the multiple socket (Fig. 2). 7636057 02/24/77