Analysis on the working principle and choice of resistance cabinets

　　Analysis on the working principle and choice of resistance cabinets

　　Working principle of the resistance cabinet

　　Principle: Connected to a current-limit electrical protection device between transformer neutral points and earth, does not work when the grid is operating, when the grid line is outlined, the transformer neutral point voltage will generate offset, if the transformer neutralPotting a grounding resistor device, which can force the distribution network neutral point, and limit its fault current to make the relay protection device have enough time to detect, realize the trip and standby switching, avoid distribution network and electrical equipmentbeen destroyed.

　　How to choose the resistance cabinet

　　Select the resistor cabinet, which can be connected between the transformer neutral point and the earth, a current limiting electrical protection device, does not work when the grid is operating, when the grid line is outline, the transformer neutral point voltage will generate offset, ifThe transformer neutral point is attached to the ground resistance device, which can force the distribution network neutral point to ground and limit its fault current.