Hybrid short-circuit failure current limiter

Abstract

The invention discloses a hybrid short-circuit failure current limiter, which consists of a reactor, a rectifier bridge, a super-conduction non-inductive coil, a switch and a shunt resistor, wherein the reactor and the super-conduction non-inductive coil are connected to a direct current side of the rectifier bridge; and the super-conduction non-inductive coil is connected in series with a winding of the reactor. In the short-circuit failure current limiting process, the super-conduction non-inductive coil quenches due to over-current and automatically triggers current limiting, and the hybrid short-circuit failure current limiter has the characteristics of high current-limiting response speed and high reliability. The resistance of the super-conduction non-inductive coil is increased, the winding current distribution of the reactor is changed, the magnetic flux of the reactor is improved, and the reactance of the reactor is increased, so high current-limiting impedance is realized, and the current-limiting capacity of the current limiter is improved. The super-conduction non-inductive coil is connected in series to a branch circuit of the current limiter, the using amount of super-conduction strips is reduced, and the manufacturing cost of the current limiter is reduced.

Description

technical field [0001] The invention relates to a short-circuit fault current limiter, in particular to a short-circuit fault current limiter for a transmission and distribution network. Background technique [0002] With the rapid development of the national economy, the society's demand for electricity continues to increase, which drives the continuous development of the power system. The capacity of single machines and power plants, the capacity of substations, and the load of cities and industrial centers continue to increase, which makes the interconnection of power systems , the level of short-circuit current in the power grid at all levels is increasing continuously, and the destructiveness of short-circuit faults to the power system and its connected electrical equipment is also increasing. Moreover, while the demand for electric energy is increasing day by day, people also put forward higher requirements for power quality, power supply reliability and security. How...

AI Technical Summary

Problems solved by technology

At the same time, the current flowing through the bias power supply is often 2 to 3 times the grid current, and must meet the requirements of the current change in the non-fault state and the fault state. Therefore, the realization of the bias power supply has certain technical difficulties and high requirements. cost

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