Electricity: electrical systems and devices – Safety and protection of systems and devices – Feeder protection in distribution networks
Patent
1997-12-08
1999-11-02
Leja, Ronald W.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Feeder protection in distribution networks
439716, H02H 300, H01R 926
Patent
active
059781939
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to switching devices in a switchboard, which can communicate with one another via a databus, or can communicate with a higher-level programmable logic controller (PLC).
2. Description of the Prior Art
Systems with switching devices, including the associated control and, possibly, measurement devices, as well as control-unit and display devices, which can be coupled via bus-compatible coupling elements to a databus, for example a two-wire bus, have been disclosed in WO-94/24647. In that publication, the normal control wiring is avoided. The databus has connected to it an interface assembly, which is connected via a serial transmission bus to a communication processor of a programmable logic controller. The interface assembly has a microprocessor with a control program which, with an appropriate configuration, allows the switchboard to be operated as an independent functional island--that is to say, a closed system. Furthermore, higher-level action on the control of the switching, control and measurement devices is possible by the communication processor, which may be located remotely. This system design relieves higher-level systems, such as the programmable logic controller, of control functions, by the communication processor, the protective function is locally decoupled and thus accelerated, and it is possible for the system switchboard to have a defined behavior in the event of failure of the transmission bus.
SUMMARY OF THE INVENTION
There is a user requirement for simple handling, which allows the switching devices described above to be commissioned quickly and reliably, including communication.
The present invention is thus based on the object of providing, for a switchboard with a data bus, simple adaptation of and electrical contact with switching devices in conjunction with electronics that are required for communication.
This object is achieved according to the present invention by a switching device unit with a communication capability. This switching device unit has an equipment mount on which a plurality of electromagnetically operated switching devices, for example contactors, overload relays and power breakers, can be adapted via a top-hat rail. Furthermore, this switching device unit contains a communication unit, which is held on the equipment mount and has plug contacts via which the electrical drive for the switching devices is possible.
In one advantageous embodiment, the equipment mount is provided with electrical first contacts and snap-action connection in such a manner that, when snapped onto the standard profile rail, the first contacts automatically make contact with data and supplies lines which are integrated in said standard profile rail.
Simple electrical connection of the switching device unit is achieved if the equipment mount is provided at the rear with electrical connections for electrical connection to busbars as main current bars, to which electrical loads can be connected via the switching devices.
For supplying electrical power and for data traffic, it is advantageous if a plug-in slot for the connection of a bus connector is provided on the communication module.
BRIEF DESCRIPTION OF THE DRAWINGS
A number of exemplary embodiments of the invention are explained in more detail in the following text with reference to the drawings, in which:
FIG. 1 shows an exploded view of the switching device unit according to the invention,
FIG. 2 shows the switching device unit according to FIG. 1 in the partially assembled state,
FIG. 3 shows a switching device unit having two contactors in an illustration which shows the mounting,
FIG. 4 shows a switching device unit which is snapped onto a standard profile rail with an inserted control rail,
FIG. 5 shows the rear of the switching device unit according to FIG. 4,
FIG. 6 shows the side view of a switching device unit with main electrical power connections.
DETAILED DESCRIPTION OF THE INVENTION
The switching device unit with a communication c
REFERENCES:
patent: 5000692 (1991-03-01), Taniguchi et al.
patent: 5541810 (1996-07-01), Donhauser et al.
Rohrbacher, Gebaude-Systemtechnik und Gebaudeautomation, etz, Bd 115, pp. 1344-1348 (1994).
Leja Ronald W.
Siemens Aktiengesellschaft
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