Rotary liquid metal current limiter

Abstract

The application discloses a rotary liquid metal current limiter. The limiter comprises an insulating shell, a first electrode, a second electrode, a rotating mechanism, liquid metal and a driving device. The insulating shell forms an accommodating space inside, and the two electrodes are respectively arranged on opposite two side walls of the insulating shell and partially located in the accommodating space. The rotating mechanism is composed of a rotating shaft and at least one rotating blade with a through-flow hole. The rotating shaft is rotatably installed on the insulating shell, and the rotating blade is fixed on the rotating shaft. In normal operation, the liquid metal forms a conductive path between the two electrodes through the through-flow hole. The driving device is connected with the rotating shaft. When a short-circuit current is detected, the rotating shaft is driven to rotate, the relative position of the through-flow hole and the electrode is changed, and the resistance of the conductive path of the liquid metal is changed. In normal operation, the high rated current-carrying capacity is ensured by the through-flow hole. When a short circuit occurs, the through-flow hole position is changed by the rotating blade to realize rapid current limiting, and the rated current-carrying capacity and the fault current limiting performance are effectively balanced.

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