Novel bridge type high temperature superconducting fault current limiter

Abstract

The invention discloses a novel bridge type high temperature superconducting fault current limiter which comprises a superconducting inductor L. A load switch FOLS1 is connected with a bias power supply Ub in series, a load switch FOLS2 is connected with a current-resisting resistor R2 in series, and the load switch FOLS1, the bias power supply Ub, the load switch FOLS2 and the current-resisting resistor R2 are sequentially connected to an electrical bridge. After the load switch FOLS2 is connected with the current-resisting resistor R2 in series, one end of the load switch FOLS2 is connected with the positive polarity end of the bias power supply Ub, and the other end of the load switch FOLS2 is connected with the connection joint between the load switch FOLS1 and the superconducting inductor L. By means of the novel bridge type high temperature superconducting fault current limiter, when a short circuit fault occurs in a power grid, the peak value of fault current can be limited, the steady-state value of the fault current can be limited, the current limiting effect is quite remarkable, and the novel bridge type high temperature superconducting fault current limiter can be applied to current limiting for short circuit faults of electric systems.

Description

technical field [0001] The invention relates to a fault current limiter, in particular to a novel bridge type high temperature superconducting fault current limiter. Background technique [0002] With the increasing scale of the power grid, a very large fault current will be generated in the event of a fault in the ultra-high voltage system. It is difficult for existing high-voltage circuit breakers to cut off the short-circuit fault current. In order to reduce the fault current, many current limiters have appeared , such as power electronic current limiters, reactance current limiters and split reactors, etc., the ideal is the superconducting current limiter, and the current rapid development is the bridge type high temperature superconducting fault current limiter. [0003] The structure of the basic bridge-type high-temperature superconducting fault current limiter is as follows: figure 1 As shown, a current-limiting circuit composed of a superconducting inductance and a...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems existing in the existing bridge-type high-temperature superconducting fault current limiter, the present invention proposes a new bridge-type high-temperature superconducting fault current limiter with a simple structure that can limit the peak value and steady-state value of the fault current

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