Eliminating harmonic bridge circuit type high temperature superconducting malfunction current limiter

Abstract

The invention discloses an eliminating harmonic bridge type high temperature and superconducting fault current limiter, which comprises an electrical bridge, a current limiting circuit that is formed by in series connection of a superconducting inductor and a bias power supply is arranged on the electrical, and the invention is characterized in that the current limiting circuit is formed by in series connection of a first load switch, the superconducting inductor, a second load switch and the bias power supply, a first solid state switch is connected in series with the current limiting circuit, then one end of the first solid state switch is connected with the input end of the electrical bridge, and the other end thereof is connected with a joint point of the first load switch and the superconducting inductor, one end of a second solid state switch is connected with the output end of the electrical bridge, and the other end thereof is connected with the joint point of the second load switch and the bias power supply. When an electrical network is in short circuit fault, the eliminating harmonic bridge type high temperature and superconducting fault current limiter can limit not only the peak of fault current, but also the steady state value of the fault current with an obvious current limiting effect, and can be applied to limit the current of three phase short circuit faults of 110KV and above 110KV electrical systems that are connected with earth wires.

Description

technical field [0001] The invention relates to a fault current limiter, in particular to a harmonic bridge elimination 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 induct...

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 bridge-type high-temperature superconducting device with simple structure, which can limit the peak value and steady-state value of the fault current, and can eliminate harmonics. fault current limiter

Images