Method and device for current limitation with an automatic current limiter

A current-limiting device and current-limiting technology, applied in relays, emergency protection devices, circuit-breakers with excessive current, etc. using electrodynamic effects, which can solve problems such as large current limiters, contamination of liquid metal, and wear and tear.
CN1820340AInactive Publication Date: 2006-08-16ABB RES LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ABB RES LTD
Publication Date
2006-08-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method and a device (1) for combined current limitation and power breaking and to a switchgear having said device (1). In a combined current limiter / power braker (1) according to the invention, a movable electrode (3, 3') is guided automatically along a resistance element (5) for the current limiting path (31) by an overcurrent-dependent force (Fmag) for the purpose of current limitation and brought to an insulator (8) in a serial arrangement for power breaking purposes. Examples of embodiments are, inter alia, the utilization of Lorenz force for automatic current limitation; movable electrodes (3, 3') realized by means of liquid metal (3) or a movable solid conductor (3'); an electrical resistance (RX) increasing non-linearly in the direction of movement (x) for smooth power limitation characteristics and a resistance element (5) in the form of a dielectric matrix (5) with several channels (3a) for the liquid metal (3). Amongst the advantages achieved are electric arc-free, reversible current limitation and power breaking, which is also suitable for high voltages and currents, rapid reaction times, little wear and easy maintenance.
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Description

technical field

[0001] The present invention relates to the main technology for electrical switchgear, especially the main technology for limiting fault current in high voltage, medium voltage or low voltage switchgear. The invention is based on a current limiting method and device as described in the preambles of the independent claims and a switching device having the device. Background technique

[0002] DE4012385A1 discloses a current-controlled disconnecting device whose operating principle is based on the constriction effect with liquid metal. Between two solid metal electrodes there is a single narrow channel filled with liquid metal. When there is an overcurrent, the liquid conductor should be contracted by the electromagnetic force through the contraction, so that the current itself contracts and separates the liquid conductor. The displaced liquid metal is collected in a storage container and reflowed after an overcurrent occurs. The separation of the contacts t...

Claims

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