Electric network current limiting device, electric network current limiter and electric network current limiting system

The utility model discloses an electric network current limiting device, an electric network current limiter and an electric network current limiting system. The electric network current limiting device comprises the following components: a first current limiting reactor; a first intelligent high-speed switch which is connected with the first current limiting reactor in parallel; a current transformer which is sleeved on a bus at one side of the parallelly connected first current limiting reactor and the first intelligent high-speed switch for monitoring the current in the bus in real time; and a controller which is connected with the current transformer and is used for switching off the first intelligent high-speed switch when the current is larger than a first preset value and switching on the first intelligent high-speed switch when the current is smaller than a second preset value, wherein the first preset value is larger than the second preset value. Through the electric network current limiting device, operation reliability of the electric network is improved. The electric network current limiting devices can be used through serial connection for limiting shortcircuit current level of the electric network with voltage of 330(500)kV or less economically and effectively.