Patent ID: 9640984
Date: 2017-05-02
CPC Classifications: H02H

Claim:
1. A current limiting device for a power grid, comprising: a first current limiting reactor; a first smart fast switch connected with the first current limiting reactor in parallel; a current transformer sleeved on a bus bar located on one side of a circuit resulting from the parallel connection of the first current limiting reactor with the first smart fast switch, configured to monitor a current in the bus bar in real time; and a controller connected with the current transformer, configured to control a switch-off of the first smart fast switch when the current in the bus bar is greater than a first preset value and a switch-on of the first smart fast switch when the current in the bus bar is smaller than a second preset value, wherein the first preset value is greater than the second preset value; a first contactor connected with the first smart fast switch in parallel, wherein the controller is configured to detect a state of the first smart fast switch and control a closing of the first contactor when the first smart fast switch rejects to act.