Electrical connectors – Bus duct
Patent
1987-03-31
1989-03-28
Paumen, Gary F.
Electrical connectors
Bus duct
174 72B, 361361, H01R 2516
Patent
active
048159859
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a prefabricated electric connection device for connection to a set of bars.
There are generally used for the distribution of electric energy distribution cabinets containing sets of bars associated with the respective phases and to which are connected devices of the utilizers for ensuring the protection of respective circuits. The main drawbacks of known connection devices are that they require time consuming operations to be connected to a utilizer apparatus and that they are of high wiring cost.
SUMMARY OF THE INVENTION
An object of the present invention is to overcome these drawbacks by providing a connection device of particularly simple structure whereby the connection of a utilizer apparatus is considerably simplified and may be carried out in a short period of time.
For this purpose, this prefabricated electric connection device for connection to a set of bars extending parallel to one another, is characterised in that the bars, which are parallel to one another and are separated by air gaps, are located one behind the other in a direction perpendicular to the planes of the bars. Intermediate connection elements, each provided with an external insulating sheath, are respectively fixed to the bars and extend forwardly perpendicular thereto. The bars are provided with aligned holes, and the intermediate connection elements are at their rear ends to those bars located at the rear of a first bar and extend through such holes in those bars. The front end of the intermediate connection element fixed to the first bar, and the front ends of the intermediate connection elements fixed to the other bars are all located in front of the first bar in the same plane perpendicular to the bars.
The holes provided in the bars have such a diameter that they do not substantially alter the cross section of the bars so that they value of the allowable intensity in the bars is only very slightly affected by the presence of the holes.
According to an additional characteristic of the invention, the front ends of the intermediate connection elements are advantageously contained in the same plane parallel to the planes of the bars.
The invention also provides protection devices for protecting against short-circuit currents, particularly in electric energy distributing installations.
The utilizer devices are generally connected to connection cabinets containing sets of bars associated with the respective phases of the network through protection devices.
The protection devices of house or plant circuits are calculated to ensure protection against short-circuit surges produced in the network, for example following an accidental short-circuit produced by the breakdown of a utilizer device, by considering the paths of the current in the connections of the distribution cabinet as short circuit paths having no impedance.
Consequently, the protection devices, such as circuit breakers, must be designed to withstand very high currents, which requires a corresponding dimensioning of the component elements, in particular of the conductors and the moving elements, arc extinguishing mens and other devices.
The electric connection device of the type defined hereinbefore has a surprising property in addition to the fact of being of a particularly simple construction relative to known connection devices and also simplifying connecting operations between the network and the utilizer apparatus.
Indeed, it has been found that this connection device, when it is connected between the network and a utilizer device, performs the function of a short-circuit current limiter.
The invention therefore also provides an electric connection device of the type defined hereinbefore, characterised in that it constitutes a limiter of excessivre currents.
BRIEF DESCRIPTION OF THE DRAWINGS
There will be described hereinafter, by way of a nonlimiting example, an embodiment of the present invention with reference to the accompanying drawings, in which:
FIG. 1 is a side elevational view of an electr
REFERENCES:
patent: 2824901 (1958-02-01), Reichert et al.
patent: 2871285 (1959-01-01), Fouse et al.
patent: 2946928 (1960-07-01), Slade
patent: 3267336 (1966-08-01), Kussy et al.
patent: 3339038 (1967-08-01), Jorgensen et al.
Fournitures Electro Techniques
Paumen Gary F.
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