Electric arc explosion chamber system

Details Electric arc explosion chamber system Electric arc explosion chamber system

1999-12-23

2001-03-27

Scott, J. R. (Department: 2832)

High-voltage switches with arc preventing or extinguishing devic

Arc preventing or extinguishing devices

C218S015000, C218S149000, C218S152000, C218S156000, C335S201000, C361S600000

Reexamination Certificate

active

06207916

ABSTRACT:

FIELD OF THE INVENTION
The invention relates generally to arcing chambers, and, more particularly, to an arcing chamber arrangement for use in direct-current switching devices.
BACKGROUND OF THE INVENTION
In contrast to alternating-current networks, natural current zero passage does not take place with direct current. Arcing chambers in direct-current switching devices produce an arcing voltage which is greater than the working voltage, thus forcing the current to zero and dissipating the energy stored in the network. The arcing voltage lies significantly above the working voltage. For example, at a working voltage of 500 V, the appearance of an arcing voltage of 800 V can be expected. However, due to the existing insulation ability of the network, arcing voltage must be limited to a maximum value. Thus, different working voltages require different arcing chambers.
Arcing chambers differ greatly in structure have hitherto been used in direct-current rapid-action switching devices for different working voltages and different switching properties. This entails great structural complexity as well as correspondingly high manufacturing costs.
SUMMARY OF THE INVENTION
In an exemplary embodiment of the invention an arcing chamber system comprises elements of a chamber body and an arcing chamber module. Depending upon the desired working voltage, a corresponding number of arcing chamber modules is used in a chamber body. If the size of the chamber body is insufficient for the working voltage of the network to be considered, a plurality of chamber bodies may be connected in series, so that the required number of arcing chamber modules can always be used.
In addition, adaptation to a desired contact rating is accomplished by the selection of appropriate arcing chamber modules. The chamber bodies are designed so that they are capable of accommodating narrow as well as wider arcing chamber modules. For this purpose, a plurality of grooves spaced equally apart is provided in the chamber body on two facing inner sides, while, depending upon the desired contact rating, the arcing chamber modules have a width corresponding to N times two neighboring grooves, N being a whole positive number.


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