Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1998-12-11
2000-03-07
Gaffin, Jeffrey
Electrical transmission or interconnection systems
Switching systems
Condition responsive
307130, 307131, H01H 4700
Patent
active
060344474
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a connection arrangement for secondary distribution systems, which effects a connection in the state free of short circuits, within permissible performance quantities, by means of at least one interrupter assembly.
BACKGROUND OF THE INVENTION
Many short-circuits arise during closing operations, since a suitable tripping device of a circuit breaker, for example, does not function until the short circuit is already flowing. In the same way, many circuits remain connected, although no current is being drawn. Even in the case of overvoltage and undervoltage, the circuits usually remain closed for the most part. For some of the problems described, partial solutions, exist such as undervoltage tripping devices for contactors and circuit breakers, as well as short-circuit tripping devices in circuit breakers.
SUMMARY OF THE INVENTION
An object of the present invention is to develop a connection arrangement for secondary distribution systems, which makes it possible to safeguard against making on a short circuit, in a single arrangement. In addition to functioning with current and voltage sensors and with a processing module, the arrangement functions with a series connection composed of a connection branch, parallel to the load, and a bridge branch that bridges the interrupter assembly. The bridge branch contains an ON switch, the bridge branch, together with the connection branch, forming a voltage divider. Testing for a short circuit includes performing a check for unacceptably high overloading that is to be expected due to faulty states. These faulty states may be resistances which are too low on the load side.
European Patent Application No. 0 621 674 illustrates a conventional connection arrangement without a series connection composed of a connection branch and a bridge branch. The conventional connection arrangement connects a load only when there is not a short circuit on the load side. For this purpose, an impedance measurement is taken. Here, the connection arrangement is for a load to secondary distribution systems. The arrangement effects a connection when free of short-circuits, within permissible performance quantities, with the assistance of at least one interrupter assembly. Current and voltage sensors are connected to a processing module via which a connection branch may be brought into the circuit and disconnected. The connection branch, designed as a connection circuit, is metallically separated from the load circuit and bridge by way of the normally open contact. In the conventional connection arrangement, provision is made in the connection circuit for an actuating element which is operatively connected to an interrupter assembly in the secondary distribution system. The interrupter assembly is also bridged by a bridge branch with a resistor. However, in the conventional arrangement, an ON switch provided therein does not have the function of closing the connection arrangement operationally.
The connection arrangement functions as a universal monitoring relay may be a centralized, thus compact arrangement, or may be a decentralized arrangement. The connection arrangement has the following properties: response to a system voltage which is too high or too low; load is too small, or when there is no load at all;
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates a connection arrangement in accordance with an exemplary embodiment of the present invention.
FIG. 2 shows a connection arrangement including additional protective conductor supervision in accordance with the present invention.
FIG. 3 shows a connection arrangement including an additional device for remote switching in accordance with the present invention.
FIG. 4 illustrates a connection arrangement including an additional bus interface in accordance with the present invention.
DETAILED DESCRIPTION
The connection arrangement according to FIG. 1 for a secondary distribution system, having outer conductor 1, formerly called phase conductor, and neutral conductor 2, mak
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Gaffin Jeffrey
Siemens AG
Zura Peter
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