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Mixed excitation type economical three-phase magnetic saturation fault current limiter

A technology of fault current limiter and mixed excitation, which is applied in the direction of emergency protection circuit devices, electrical components, emergency protection circuit devices, etc. for limiting overcurrent/overvoltage, and can solve the problems of poor three-phase fault current limiting effect, etc. Achieve the effects of saving ferromagnetic materials, reducing excitation loss and reducing the occupied area

Active Publication Date: 2018-08-14
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the mutual influence of the three-phase windings, it can only be used to limit the single-phase fault current, and the effect on the three-phase fault current is poor.

Method used

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  • Mixed excitation type economical three-phase magnetic saturation fault current limiter
  • Mixed excitation type economical three-phase magnetic saturation fault current limiter
  • Mixed excitation type economical three-phase magnetic saturation fault current limiter

Examples

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Embodiment Construction

[0025] The features and advantages of the present invention can be further understood through the following detailed description in conjunction with the accompanying drawings. The examples provided are only illustrative of the method of the present invention and do not limit the rest of the present disclosure in any way.

[0026] like figure 1As shown, a hybrid excitation type economical three-phase magnetic saturation fault current limiter, hereinafter referred to as the current limiter, includes an iron core, a coil winding, three current limiting inductors and a DC excitation power supply. Stem 101, second open stem 102, left A-phase stem 201, left B-phase stem 202, left C-phase stem 203, right A-phase stem 204, right B-phase stem 205 located on both sides of the center pillar , the right C-phase stem 206, the upper cross-yoke 301, the lower cross-yoke 302, the first permanent magnet 401 inlaid in the middle of the upper cross-yoke, and the second permanent magnet 402 in t...

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Abstract

The invention relates to a mixed excitation type economical three-phase magnetic saturation fault current limiter comprising a magnetic core, a coil winding, three current limiting inductors and a direct current excitation power source, wherein the magnetic core comprises two pillars with an air gap therebetween, and left A, B and C phase side pillars and right A, B and C phase side pillars positioned on two sides of the central pillars; and the coil winding comprises a first coil and a second coil wound on a left A pillar, a third coil and a fourth coil wound on a left B pillar, a fifth coiland a sixth coil wound on a left C pillar, a seventh coil and an eighth coil wound on a right A pillar, a ninth coil and a tenth coil wound on a left B pillar, and an eleventh coil and a twelfth coilwound on a left C pillar. According to the mixed excitation type economical three-phase magnetic saturation fault current limiter, the three phase current limiter is integrated, the good limiting effect is achieved for a short-circuit current with various fault types, and the magnetic material and installation area are greatly saved. Furthermore, the loss in the iron core is also greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of high-voltage electrical equipment, and relates to a device for limiting the fault current of an AC transmission network, in particular to a hybrid excitation type economical three-phase magnetic saturation fault current limiter Background technique [0002] With the rapid and sustainable development of my country's economy, the demand for electricity continues to increase, and the scale of the power system is also increasing. The continuous increase of the power grid capacity of the power system brings with it the continuous increase of the short-circuit current level in the system, and the partial short-circuit fault current level even exceeds the breaking capacity of the circuit breaker, and the upward trend is becoming more and more obvious, which seriously threatens the power system. Safe and stable operation. At present, the main measures to limit the short-circuit current level of the power grid in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02
Inventor 袁佳歆周航钟永恒甘鹏程张朝阳
Owner WUHAN UNIV
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