Self-saturation electric reactor type fault current limiter

Abstract

The invention discloses a self-saturation electric reactor type fault current limiter. The self-saturation electric reactor type fault current limiter comprises a first branch circuit, a second branch circuit and an electric reactor Lc, wherein the first branch circuit and the second branch circuit are connected in parallel, and the electric reactor Lc is connected with the first branch circuit and the second branch circuit in series. The first branch circuit comprises a current limiting protection electric reactor Lb2, a self-saturation electric reactor Lsat and a recovery time current dropping resistor Rj, wherein the current limiting protection electric reactor Lb2, the self-saturation electric reactor Lsat and the recovery time current dropping resistor Rj are sequentially connected in series. The self-saturation electric reactor comprises an iron core and two winding coils. The self-saturation electric reactor type fault current limiter is simple in circuit structure, and has the advantages of being significant in current limiting effect, suitable for wider-range input voltages, reliable, stable, high in practicability and the like.

Description

technical field [0001] The invention relates to the protection field of power transmission and distribution equipment, in particular to a self-saturated reactor type fault current limiter. Background technique [0002] As the demand for electricity increases, the amount of electricity generated increases day by day. As power generation increases, fault current levels increase. Equipment failure, severe weather, accidents or vandalism can cause power changes. These faults can damage expensive key components, and if they cannot be cleared in time, they may lead to long-term power outages and huge economic losses. Therefore, ensuring the safe and stable operation of the power system and quickly limiting the level of short-circuit current has become an extremely urgent problem in the current power system. [0003] At present, there are mainly the following types of fault current limiters in power systems at home and abroad: controllable resistance superconducting fault curren...

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Problems solved by technology

[0004] But this controllable resistance type superconducting fault current limiter has the following technical defects: the above-mentioned controllable resistance type superconducting fault current limiter contains superconducting components, and the refrigeration process of the superconducting components (i.e. superconductors) is complex and troublesome to maintain; The important thing is that it takes a long time for a superconductor to re-enter the superconducting state after quenching, which does not meet the time requirement for a superconducting current limiter to resume work within tens of milliseconds

However, in the structure of the above fault current limiter, the capacitor C is bypassed, and after LB is saturated, it cannot resonate with the capacitor C in parallel. little flow

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