Economical bridge type fault current limiter

Abstract

The invention discloses an economical bridge type fault current limiter. The economical bridge type fault current limiter comprises a coupling reactor and a fault current-limiting bridge circuit. Thefault current-limiting bridge circuit is composed of a single-phase rectifier bridge circuit and a direct-current reactor, the single-phase rectifier bridge circuit is composed of four thyristors or two thyristors and two diodes, and the direct-current reactor is connected to the direct-current output end of the single-phase rectifier bridge circuit in parallel. The coupling reactor is formed by concentrically arranging two sets of windings wound in opposite directions, one winding is connected with the alternating current side of the fault current-limiting bridge circuit in series and then isconnected with the other winding in parallel, and the two windings are connected through a synonym end. According to the invention, the influence on the system during the normal operation of the current limiter is effectively reduced, the fault current-limiting response speed of the current limiter is improved, and the economy and reliability of the current limiter are improved.

Description

technical field [0001] The invention relates to a bridge-type current limiter, in particular to an economical bridge-type fault current limiter, which belongs to the technical field of high-voltage power grid fault current limitation. Background technique [0002] With the continuous improvement of the scale of the power grid and the level of interconnection, the electrical distance between plants and stations has been significantly shortened, and the electromagnetic ring network between high and low voltage systems has increased, resulting in a continuous decrease in system impedance and a continuous increase in the level of short-circuit current in the system. Due to the above-mentioned serious hazards of the system short-circuit current, it is very urgent to study various short-circuit current limiting technologies, and it has also become a research hotspot in the field of power systems at home and abroad. [0003] In order to effectively limit the increasing short-circui...

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Problems solved by technology

[0005] Aiming at the deficiencies and problems of the existing fault current limiter technology, the present invention proposes an economical bridge type fault current limiter, which effectively reduces the impact on the system during normal operation of the current limiter and improves the fault current limiting response of the current limiter speed, and improves the economy and reliability of the current limiter

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