Economical bridge type fault current limiter

A fault current limiter, an economical technology, applied in the direction of emergency protection circuit devices used to limit overcurrent/overvoltage, parts of transformers/inductors, and conversion of AC power input to DC power output, etc., to reduce volume, The effect of economically increasing and reducing the flow capacity of the device

Inactive Publication Date: 2020-07-17
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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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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  • Economical bridge type fault current limiter
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Embodiment Construction

[0021] The specific implementation of the present invention is as follows.

[0022] Such as figure 1 , figure 2 As shown, the specific implementation of the bridge fault current limiter includes a coupling reactor and a fault current limiting bridge; the bridge fault current limiter is connected in series between the system power supply and the load.

[0023] The fault current limiting bridge is composed of a single-phase rectifier bridge and a DC reactor. The single-phase rectifier bridge is composed of four thyristors T1, T2, T3, T4 or two thyristors T1, T2 and two diodes D1, D2 The DC reactor Ld is connected in parallel to the DC output end of the single-phase rectifier bridge.

[0024] The coupling reactor is composed of two sets of windings L1 and L2 wound in opposite directions concentrically arranged, and the structure of the windings L1 and L2 adopts a hollow or iron core type. One of the windings is connected in series with the AC side of the fault current-limitin...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H02M7/162H01F27/28
CPCH02H9/021H02M7/162H01F27/2828
Inventor 莫育杰王利军
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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