Magnetron type fault current limiter

Abstract

The invention relates to a magnetron type fault current limiter which utilizes the adjustable reactance characteristic of a magnetron reactor, enables the magnetron reactor to follow the change of system current and appropriately adjusts the reactance. When a system has a short-circuit fault, high impedance can appear instantaneously, so that the growth of short-circuit current is limited, and the short-circuit current is limited at a degree which is acceptable by a power grid. The magnetron type fault current limiter comprises a three-phase magnetron reactor, a hollow reactor, a direct current excitation unit and an automatic control unit; the input end and the output end of the three-phase magnetron reactor are connected in series with the power grid; a lead-out terminal of the three-phase magnetron reactor is connected in series with the hollow reactor; the hollow reactor is connected in series with the direct current excitation unit; and the direct current excitation unit is connected in parallel with the automatic control unit. The magnetron type fault current limiter has the advantages of large capacity, simple structure, high reliability, low cost and the like, can meet the technical requirement on the current limiting of the system, is easy to realize high voltage and large capacity, and is expected to be widely applied in the power supply system.

Description

technical field [0001] The invention relates to a short-circuit fault current limiter of a power transmission and distribution network, in particular to a magnetically controlled fault current limiter applied to a power transmission and distribution system to limit short-circuit current. Background technique [0002] With the continuous development of my country's power system, the scale and capacity of the transmission and distribution network are expanding day by day, and the interconnection degree of the power grid is getting higher and higher, the fault short-circuit current level of the power grid is also rising. In order to reduce the harm caused by short-circuit current to the power system, corresponding measures must be taken to limit the short-circuit current of the power system. Generally, the limitation of short-circuit current can be considered from the aspects of adjusting the grid structure, changing the system operation mode and installing current limiting equ...

AI Technical Summary

Problems solved by technology

The disadvantage of superconducting current limiters is that they are expensive and difficult to apply in a wide range

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