Self-protection current limiting device based on fast switch with large capacity (FSR)

Abstract

The invention relates to a self-protection current-limiting device based on a large-capacity high-speed switch FSR, including a current-limiting reactor L, a large-capacity high-speed switch FSR, a high-speed eddy current switch K0, a discharge damper RL; a discharge damper RL, a current-limiting reactor L, the high-energy fuse FU are connected in series in sequence, and the two ends of the series are respectively connected in parallel with a large-capacity high-speed switch FSR and a high-speed eddy current switch K0; one end of the discharge damper RL is connected to the incoming line terminal AL1 of the device, and the other end is connected to the limiter One end of the high-energy fuse FU is connected to the outlet end of the current-limiting reactor L, and the other end is connected to the outlet end AL2 of the device. The invention is simple in structure, safe and reliable, and can be put into the current-limiting reactor L within 0.15ms. The intensity of the short-circuit current can be effectively limited through the current-limiting reactor L, and the impact of the short-circuit current on the electrical equipment is greatly reduced. At the same time, zero loss of the current-limiting reactor in normal operation can be realized.

Description

Technical field [0001] The invention relates to the technical field of power system current-limiting reactors, in particular to a self-protection current-limiting device based on a large-capacity high-speed switch FSR. Background technique [0002] With the development of the economy, the rapid growth of electrical loads, and the increase of grid capacity, the increasing short-circuit current has more and more impacts on the electrical equipment of the power system; at the same time, the breaking capacity of the existing circuit breakers has become difficult. Satisfy breaking huge short-circuit current. Therefore, in order to solve this major problem, the current-limiting reactor is widely used in the power transmission and distribution system in the way of series connection loop. [0003] Although the current-limiting reactor is connected in series in the loop, it can limit the short-circuit current intensity, reduce the impact of the short-circuit current on the electrical equi...

AI Technical Summary

Problems solved by technology

However, the series current-limiting reactor has many shortcomings. First, the huge reactive power loss in the series circuit of the current-limiting reactor also causes a great economic burden to the user; secondly, when selecting the reactance value of the current-limiting reactor , there is often a contradiction that the voltage at the user end is too low under the rated current after meeting the requirements for limiting the short-circuit current

In the long-distance transmission process of the transmission and distribution network of the power system, the transmission line will also generate inductive reactance, which is equivalent to forming an invisible and potential reactor in the load circuit of the user in series, which also causes the voltage at the user end to decrease, and at the same time There is also a large reactive power loss

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