Mixed type magnetic saturation fault current limiter

Abstract

The invention discloses a mixed type magnetic saturation fault current limiter. The current limiter comprises an iron core, coil windings, a direct current power supply and a current-limiting reactor. A permanent magnet and a direct current coil winding are jointly used as an excitation bias source, so that the demand on the direct current bias source is effectively reduced, the demagnetization risk of the permanent magnet is reduced, the reliability of an apparatus is improved, and the consumption and the cost of the apparatus are reduced as well; by adoption of a bridge type structure, the alternating current and the direct current can share the winding, so that the volume of the apparatus can be effectively reduced, and the consumption can be lowered at the same time; the fault current is limited by the current-limiting reactor in a direct current bias loop, so that the current-limiting effect is ensured, and the current-limiting level can be controlled as well; and four coil windings are serially connected through an ingenious connection manner, so that the current in each coil winding is reduced by half while the normal work of the fault current limiter is ensued, the consumption of the current limiter in the normal operation is reduced, and the reliability of the apparatus is improved.

Description

technical field [0001] The invention relates to equipment for limiting fault current in a high-voltage AC transmission network, in particular to a hybrid magnetic saturation fault current limiter. Background technique [0002] With the continuous rapid growth of my country's industrial development, the people's living standards are improving day by day, the social demand for electricity is increasing, and the grid capacity of the power system is also increasing correspondingly to meet the load demand, resulting in an increasing level of short-circuit current in the system. The short-circuit fault current level may even exceed the maximum withstand current value of some existing equipment, which poses a serious threat to the safe operation of the power system. The short-circuit fault current limiter is an important device to limit the short-circuit fault current of the grid. When the line is running normally, the short-circuit fault current limiter has no adverse effects on th...

AI Technical Summary

Problems solved by technology

However, due to the large amount of two square-shaped magnetic cores and the corresponding required permanent magnets, it is not suitable for industrialized mass production; the struc

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