CH677974A5 - - Google Patents

Description

1

CH 677 974 A5

2nd

description

The invention relates to an electricity meter with an audio frequency ripple control receiver integrated in the meter housing, which influences bistable switching means for reversing the tariff facilities.

Such electricity meters are known, e.g. from DE-OS 2 302 754, in which an electricity meter is summarized with a ripple control receiver. This arrangement is used to switch a double tariff meter, saving space compared to conventional separate arrangements. The ripple control receiver can be retrofitted into any tariff meter.

For such counters, when installing the device at the energy consumer, it is necessary that the relay for switching the double tariff meter is set to the counting position that exists at that time.

For this, the refais must be accessible, i.e. the counter must be opened in order to set it mechanically in the valid counting position.

Before installing an electricity meter at the energy consumer, each meter must be officially certified, i.e. the meter must be checked in the test center. In the case of the two tariff meter, both tariff meters must have registered a predefined consumption quantity, the maximum also runs for the maximum meter, and both maxima for double meter meters to check the exact registration. This check takes place at well-known test stations that draw energy from the grid and are therefore also accessible to the ripple control. However, it must be ensured that there is no tariff switchover during the test, or the tariff switchover must not be effective for the meters to be tested in order to achieve exact test results. After such a check, the meters are provided with a so-called certification seal and are therefore no longer accessible.

With today's miniaturization of the components, it is possible to use an audio frequency ripple control receiver with a number of switching means, e.g. bistable miniature relays, to be arranged on a module within the electricity meter. This makes access to the switch difficult or impossible after the seal of approval.

The object of the invention was to enable the accessibility of the switching means outside the audio frequency control option for testing and installation purposes for electricity meters with an integrated audio frequency ripple control receiver, even with meters already provided with a certification seal.

This object is achieved by the invention as set out in the characterizing part of the first claim. The dependent claims describe further advantageous measures.

The invention is explained in more detail below on the basis of a basic circuit diagram. The circuit diagram only shows the elements necessary for understanding the invention. The representation of the drive systems of the meter and their connection circuits are generally known and omitted for the sake of clarity.

For electricity counters (Z) with an integrated audio frequency ripple control receiver (TF), bistable switching means (R1 ... Rn) are provided for switching n double or multiple tariff counters or maximum equipment (T1..Tn). These switching means (R1 ... Rn) are controlled by signaling via the energy distribution network, the control signals (s) being fed to a signal decoding and command comparison device (DEC) via filters. This device (DEC) has the task of decoding the commands, comparing them with the stored data and forwarding the command, i.e. to control the assigned switching means (R1 ... Rn) in the desired position. The contacts (rL.rn) of the switching means then control the tariff devices (T1 ... Tn) of the meter via amplifiers (V1 ... Vn).

In order to be able to influence the tariff devices (T1 ... Tn) for test purposes and to set them in the correct position when installing a meter, the control lines of the tariff devices (T1.,. Tn) are additionally connected via potential isolating modules (P1 .. .Pn) on free or additional terminals (K1 .., Kn) of the terminal block of the meter (Z). This means that the switching means (R1 ... Rn) and the tariff facilities (T1..Tn) are accessible electrically. Since the terminal block is sealed after the installation of a meter, manipulation is not possible.

By applying a voltage pulse to one of the terminals (K1 ... Kn) which is converted into a switching pulse of low voltage via the assigned potential isolating module (P1 ... Pn), the corresponding switching means (R1.,. Rn) controlled in the other position and in parallel the connected tariff facility (T1 ... Tn) switched. The state achieved in this way is saved by the switching means (R1 ... Rn) or its contact (r1 ... m) until the next control pulse is given.

In order to prevent switching of the tariff devices (T1 ... Tn) by ripple control impulses of the energy distribution network during a metrological test of counters (Z), the signal decoding and command comparison device (DEC) is preceded, for example, by an inhibition link whose non-negated input is connected to the control signals (S) of the ripple control and whose negated input is connected to another free terminal (Kn + 1) During the testing of a counter, permanent potential (Kn +1) is applied to this terminal, which means that TF) is switched practically insensitive.

Bistable card relays are preferably used as switching means (Rl ... Rn). When a pulse is given by mains voltage pulses to the terminals (K1 ... Kn), the relays (R1 ... Rn) each take the other switching position, i.e. their contacts (r1 ... rn) are open or closed. If the pulse length is increased considerably, so that over a period of e.g. greater than 5 sec. potential at the relays (R1 ... Rn), these are in a defined Aus5

10th

15

20th

25th

30th

35

40

45

50

55

60

65

2nd

3rd

CH 677 974 AS

4th

controlled position, which is characterized, for example, by open contacts (r1 ... rn).

These two functions of the relay control with different pulse lengths allow the tariff devices (T1 ... Tn) to be set when the meter is installed at the energy consumer and by applying long pulses and permanent potential to the audio frequency ripple control receiver (TF), a conventional meter test known test stations.

The respective position of the relays (r1 ... Rn) or the tariff facilities (Tt ... Tn) are indicated by LEDs.

Instead of assigning additional or free terminals to the counter block, optical control by means of light pulses can also be implemented. In this case, preferably only one optical receiver is linked to the relays (R1 ... Rn) via corresponding conversion modules, a setting or test sequence for the individual tariff devices (T1 ... Tn) being controlled in a cyclical sequence. The advance to the individual relays can be controlled by giving impulses of different lengths and the relays can be set into the individual positions by coding.

A sealable flap or an encryption based on data exchange between the command comparison memory or another device memory (DEC) and a light transmitter prevent deliberate manipulation.

Claims (6)

Claims 1. Electricity meter with an audio frequency ripple control receiver integrated in the meter housing, which influences bistable switching means for reversing the tariff facilities, characterized in that the bistable switching means (for checking the meter (Z) and for setting the tariff facilities (T ...) in the prescribed positions R. ") can be controlled electrically via additional control inputs (K.", P ...) secured against unauthorized interference and the signal decoding and command comparison device (DEC) of the audio frequency ripple control receiver (TF), which acts as a control module for the bistable Switching means (R „.) Is used, can be switched out of function by applying permanent potential. 2. Counter according to claim 1, characterized in that free or additional terminals (K ...) of the electricity meter (Z) serve as additional control inputs, to which potential isolating modules (P ...) are arranged. 3. Counter according to claim 1, characterized in that the bistable switching means (R. ") are controlled by short pulses in the other switching position and by a long pulse in a defined starting position. 4. Counter, according to claim 1, characterized in that a logical link between the permanent potential input (Kn + 1) and signal input (S) controls the blocking of the signal decoding and command comparison device (DEC) and the switching means (R. ") in brings a defined position. 5. Counter according to claim 2, characterized in that as an additional control input, only an optical receiver with downstream conversion modules is connected to the control lines of the switching means (R ...). 6. Counter according to claim 5, characterized in that a setting and test sequence is triggered in a cyclic sequence by light pulses. 5 10th 15 20th 25th 30th 35 40 45 50 55 60 65 3rd