Electrical transmission or interconnection systems – Switching systems – Plural switches
Patent
1981-05-14
1983-01-11
Griffin, Donald A.
Electrical transmission or interconnection systems
Switching systems
Plural switches
H01H 1914
Patent
active
043683940
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a computer-controlling switching device for controlling power switching elements, such as relays, motor protection switches or the like, for controlling devices or installations wherein the computer is connected through an analog-digital converter to at least one detector monitoring the current consumption of the device being monitored, for example a motor, transformer or the like, and emits switching signals when predetermined values are exceeded and/or are not reached.
Such a switching arrangement for switching devices of this type are known from DE-AS (accepted German patent application) No. 2,310,103.
Furthermore, it has been proposed in DE-OS (laid-open German patent application) No. 2,641,677 to arrange all elements, that is power and control part, of a three-phase drive for smaller to average power and voltages on a printed circuit board.
It is the object of the invention to provide a switching device of the first-mentioned kind, which is easy to mount and which is distinguished by a very simple mechanical structure.
This is achieved according to the invention by combining in a known manner the detector(s) responsive to the magnetic field of the conductor(s) leading to the device to be monitored, the analog-digital converter(s), the computer comprised of a microprocessor, the adjusting elements connected thereto for the input of comparison values and additional characteristic data, as well as a switching element controlled by the output of the computer, together with the associated terminals and optionally a power-supply unit or a voltage source into a unit module, and this unit module as well as the housing thereof defines passages for the conductors leading to the device or the like to be monitored and the detectors constituted, for example, by Hall generators are arranged in their proximity. The compact structure of the switching device and the arrangement of passages for the conductors leading to the device to be monitored make a very simple assembly of the device possible. In practice, it is only necessary to disconnect the conductors from the device to be protected or controlled or from the power switching element and to lead them through the switching device and re-connect them, the same as the control conductors leading to the power switching element.
In the case of the use of Hall generators as detectors in combination with the computer, the control device has the advantage that it is usable in a broad band width in relation to the magnitude of the currents to be monitored. Such a combination may readily attain, for example, a current adjustment range of 1:10 in protection switches for motors.
A particularly simple mechanical structure of the switching device according to the invention results from a unit module consisting essentially of two prints electrically interconnected by detachable plug connections, one of which is equipped with the switching element controlled by the computer as well as optionally a power-supply unit and/or a voltage source and the other one is equipped with the detector and the computer, together with the analog-digital converters and the adjusting elements. This substantially facilitates the design of the prints and, at the same time, the electronic structural parts operating with the lower voltages are separated from the structural parts usually operating with higher voltages, such as a power-supply unit or the switching element controlled by the computer, the latter, of course, only with respect to its output circuit. The arrangement of the electronic structural parts operating only with lower voltages, for instance 5 V, and those operating with a higher voltage, for instance 220 V, such as power-supply unit and switching element, on separate prints avoids sources of trouble.
With respect to the manufacture and as low a cost as possible in the assembly of the switching device, it is particularly advantageous if a housing is provided for the mechanical connection of the two prints, which is comprised of two halves which have passages or
REFERENCES:
patent: 4056733 (1977-11-01), Prestridge
Griffin Donald A.
Kelman Kurt
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