Bias bridge type short circuit current limiter

Abstract

The short-circuit current limiter as bias bridge comprises: a saturation reactance circuit with an ac winding as two cylinder packets in series, a rectangular-cylinder bias winding, and T-shaped iron core to accommodate former packets; and a limiting reactor to form a bias current loop with former winding. This invention takes up less than 1% rated voltage, generates no additional harmonic, and can limit short-circuit current within 4-times conventional value.

Description

technical field [0001] The invention relates to a device in the field of electrical technology, in particular to a bias bridge type short-circuit current limiter. Background technique [0002] With the continuous development and expansion of the power system, the short-circuit capacity of the system has increased rapidly, reaching the level where the interrupting capacity of conventional circuit breakers cannot meet the requirements. The use of effective current limiting technology in the system, on the one hand, can limit the short-circuit current to a lower level to meet the requirements of the breaking capacity, on the other hand, it can greatly reduce the design value of the dynamic and thermal stability of the electrical equipment, and has the advantages of Great economic value and social significance. At present, superconducting short-circuit current limiters are more researched. The application technology of superconducting technology in high-voltage and high-power a...

AI Technical Summary

Problems solved by technology

There are two problems with this current limiter. One is that the thyristor has to pass the short-circuit current in the case of a short circuit, which fundamentally limits the application of high power, and it is difficult to rise to the application of the 500kV power grid.

Second, the use of a fully-controlled bridge-type superconducting fault current limiter will introduce a large number of harmonics, and a fault detection device is required

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