Series resonance zero-loss current limiting device

Abstract

The invention relates to a series resonance zero-loss current limiting device, which comprises a current limiting reactor, a resonant capacitor, a discharge damping protection system and an intelligent protection control system, wherein the current limiting reactor is arranged in a power distribution cabinet; the resonant capacitor is connected with the reactor in series; the resonant capacitor and the current limiting reactor form series resonance; the discharge damping protection system is connected with the resonant capacitor in parallel and is used for releasing electric energy; and the intelligent protection control system is connected with the resonant capacitor and is used for preventing the resonant capacitor from being damaged. The series resonance zero-loss current limiting device is simple in structure, convenient to use, safe and reliable, can effectively limit the strength of a short-circuit current, greatly reduces the impact of the short-circuit current to electric equipment, and can achieve zero loss of the current limiting reactor when ensuring the voltage of a user terminal.

Description

technical field [0001] The invention relates to the technical field of current limiting of power distribution equipment in a power system, in particular to a series resonance zero-loss current limiting device. Background technique [0002] With the development of the economy and the sharp increase of electrical load, the capacity of the power grid increases, and the impact of the increasing short-circuit current on the electrical equipment of the power system is increasing; at the same time, the breaking capacity of the existing circuit breaker has been difficult to meet Break the huge short-circuit current. Therefore, in order to solve this major problem, the current-limiting reactor is widely used in the transmission and distribution system of the power system by being connected in series. The current-limiting reactor connected in series in the circuit can limit the short-circuit current intensity, reduce the impact of the short-circuit current on the electrical equipment...

AI Technical Summary

Problems solved by technology

However, the series current-limiting reactor has many shortcomings. First, the huge reactive power loss in the series circuit of the current-limiting reactor also causes a great economic burden to the user; secondly, when selecting the reactance value of the current-limiting reactor , there is often a contradiction that the voltage at the user end is too low under the rated current after meeting the requirements for limitin

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