Power grid current limiting device, power grid current limiter and power grid current limiting system

Abstract

The invention discloses a power grid current limiting device, a power grid current limiter and a power grid current limiting system. The power grid current limiting device comprises a first current limiting reactor, a first intelligent high speed switch, a current transformer and a controller, wherein the first intelligent high speed switch is parallelly connected with the first current limiting reactor, the current transformer is sleeved on a bus on one side of the parallelly connected first current limiting reactor and the first intelligent high speed switch and is used for monitoring current in the bus in real time, the controller is connected with the current transformer and used for controlling to switch off the first intelligent high speed switch when the current is larger than the first preset value and to switch on the first intelligent high speed switch when the current is smaller than the second preset value, and the first preset value is larger than the second preset value. By the aid of the power grid current limiting device, the power grid current limiter and the power grid current limiting system, running reliability of a power grid is improved, and the power grid current limiting device can be utilized in series to economically and effectively limit short-circuit current level of the power grid smaller than 330 (500)KV.

Description

technical field [0001] The invention relates to the electrical field, in particular to a power grid current limiting device, a power grid current limiter and a power grid current limiting system. Background technique [0002] Due to the development of the power grid, the maximum short-circuit current of the power grid in many areas exceeds the breaking capacity of the circuit breaker (currently the maximum is 63kA). Limited by this, a more effective short-circuit current breaking technology is required. [0003] In the early stage of domestic development, a large-capacity high-speed switch was developed that combined the explosive rapid breaking current-carrying bridge body, high-voltage current-limiting fuse, and high-energy-absorbing zinc oxide resistor. The large-capacity high-speed switch can be broken at the initial stage of short-circuit current rise. And limit its growth. When the short-circuit current reaches about 15% of the peak value, the short-circuit current ca...

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a power grid current limiting device, a power grid current limiter and a power grid current limiting system to solve the problem of low reliability of power grid operation in the prior art

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