A kind of AC current limiter and its current limiting method

Abstract

The invention discloses an AC limiter and a current limiting method thereof. The AC limiter comprises an incoming line end, an outgoing line end, a vacuum arc extinguishing chamber, an operating mechanism, a current limiting reactor, an armature, a static contact, a movable contact, a connection rod, an iron core and a coil. The invention also discloses the current limiting method of the AC limiter. Power switch equipment and the current limiting reactor are integratedly designed, and the integral volume of equipment is reduced; and meanwhile, the reactance of the current limiting reactor is gradually increased during the acting process of the operating mechanism, TRV generated at two ends of the current limiting reactor is reduced, and an energy absorption lightning arrester connected inparallel to the current limiter is omitted. The AC limiter has the advantages of simple and compact structure, low cost, small size and the like.

Description

technical field [0001] The invention relates to the technical field of AC current limiters, in particular to an AC current limiter and a current limiting method thereof. Background technique [0002] The rapid development of society makes the load of the power system increase rapidly, and correspondingly puts forward higher and higher requirements for the power supply capacity of the power system. As more and more large-scale generating units and new small-capacity power sources such as wind energy and photovoltaics are continuously connected to the power system, the transmission capacity of the power system has been effectively improved, but at the same time it has led to a rapid increase in short-circuit capacity (ie, short-circuit current). The rapid increase of short-circuit current is very harmful to the normal operation of the power system. [0003] On the one hand, the fast-growing short-circuit current puts forward higher requirements on the breaking capacity of the...

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Problems solved by technology

However, this type of current limiter is mostly composed of discrete switchgear and reactors, which is not convenient for installation and transformation of existing substations due to its large size; at the same time, in the process of current transfer, due to the short-circuit current is directly transferred to the In terms of reactance, a transient recovery voltage (TRV) with a higher amplitude and a larger rate of rise will be generated at both ends of the reactance, which puts extremely high requirements on the parallel connection of power switching equipment, so parallel arresters are usually required to absorb current limiting. part of the energy

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