Current-limiting zinc oxide FR based high voltage current-limiting device

Abstract

The invention relates to a high-voltage current-limiting device based on current-limiting zinc oxide FR, which includes a current-limiting zinc oxide FR, a high-voltage quick-blow fuse FU, a high-speed eddy current switch K0, a discharge damper RL, and a first isolation switch G1, a second The isolation switch G2 and the third isolation switch G3, the discharge damper RL and the high-speed eddy current switch K0 are connected in series at both ends of the current-limiting zinc oxide FR, and the high-voltage fast-blow fuse FU is connected in parallel at the two ends of the current-limiting zinc oxide FR. terminal, the incoming line end of the current-limiting zinc oxide FR is connected to the incoming line end AL1 of the high-voltage current limiting device through the first isolation knife switch G1, and the outgoing line end of the current-limiting zinc oxide FR is connected to the high-voltage current limiting device through the second isolation knife switch G2 Outgoing terminal AL2. The invention can quickly put into the current-limiting zinc oxide FR, through which the intensity of the short-circuit current can be effectively limited, and the impact of the short-circuit current on electrical equipment can be greatly reduced. While ensuring the voltage of the user terminal, the current-limiting oxidation can be realized Zero loss of zinc FR.

Description

technical field [0001] The invention relates to the technical field of current-limiting zinc oxide in power systems, in particular to a high-voltage current-limiting device based on current-limiting zinc oxide FR. Background technique [0002] With the development of economy, the sharp increase of electric load, and the increase of grid capacity, the impact of increasing short-circuit current on electrical equipment of power system is also increasing; at the same time, it is difficult for existing circuit breakers to break huge short-circuit current. Therefore, in order to solve this major problem, the current-limiting element is widely used in the transmission and distribution system of the power system by being connected in series. [0003] The current-limiting element connected in series in the circuit can limit the intensity of the short-circuit current, reduce the impact of the short-circuit current on the electrical equipment in the power system, maintain the bus vo...

AI Technical Summary

Problems solved by technology

However, the series current limiting components have many shortcomings. First, the huge reactive power loss in the series circuit of the current limiting components also causes a great economic burden to the user; secondly, when selecting the current limiting components, there are often constraints After the short-circuit current requirement, the user terminal voltage is too low under the rated current contradiction

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 component in the user load circuit in series, which also causes the user terminal voltage to drop, and at the same time There is a large reactive power loss

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