A Hybrid Magnetic Saturation Fault Current Limiter

Abstract

The invention discloses a hybrid magnetic saturation fault current limiter, which comprises an iron core, a coil winding, a DC power supply and a current limiting reactance. The permanent magnet and the DC coil winding are used together as the excitation bias source, which effectively reduces the requirements for the DC bias source, reduces the risk of demagnetization of the permanent magnet, and reduces the loss and cost of the device while improving the reliability of the device; by using the bridge The structure realizes the shared winding of AC and DC current, which can effectively reduce the volume of the device and reduce the loss at the same time; the fault current is limited by the current-limiting reactance in the DC bias circuit, on the one hand, the current-limiting effect is guaranteed, and on the other hand, the fault current is limited. The current level can be controlled; the four coil windings are connected in series and parallel through an ingenious connection method. On the premise of ensuring the normal operation of the fault current limiter, the current in each coil winding is halved, reducing the normal operation time. loss, improving the reliability of the device.

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...

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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 structural parameters of the magnetic core have a greater impact on the performance of the device, and the literature does not have any structural parameters. to elaborate on the choice of

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