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 limiting the short-circuit current

In the long-distance transmission process of the transmission and distribution network of the power system, the transmission line will also generate inductive reactance, which is equivalent to forming an invisible and potential reactor in the load circuit of the user in series, which also causes the voltage at the user end to decrease, and at the same time There is also a large reactive power loss

Images