Process and device for current switching with a fluid-driven...

Details Process and device for current switching with a fluid-driven... Process and device for current switching with a fluid-driven...

2006-12-19

2006-12-19

DeBeradinis, Robert L. (Department: 2836)

Electrical transmission or interconnection systems

Switching systems

Switch actuation

Reexamination Certificate

active

07151331

ABSTRACT:
A process and a device are disclosed for current limiting and/or circuit breaking and a switchgear assembly with such a device. As claimed in the invention a liquid metal is moved by a dielectric fluid drive with a control between a first current path for the rated current (I1), a second current path for current limiting (I2) and optionally a third current path for current interruption (i=0), the working fluid acting mechanically with a definable drive pressure (p1, p2) directly on one surface of the liquid metal. Embodiments are, among others, the following: insulating gas or insulating liquid as the drive fluid; pressure drive with pressure vessels and valves or a piezodrive for the working fluid; and design criteria for the liquid metal arrangement, drive pressure (p1, p2) and piezodrive. Advantages are, among others, the following: reversible current limiting and current interruption, also suited for high voltages and current, fast reaction times, low wear and maintenance-friendly.

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