Method of eliminating ferromagnetic resonances

A ferromagnetic resonance and resonance technology, applied in the electromagnetic field, can solve the problems of zero-sequence voltage error, affecting the signal action of the system insulation monitoring device, and zero-sequence PT burning.
CN103199514AActive Publication Date: 2013-07-10CHONGQING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHONGQING UNIV
Publication Date
2013-07-10

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Abstract

The invention discloses a method of eliminating ferromagnetic resonances. A sine fitting algorithm is utilized to identify ferromagnetic resonances and one-phase grounding faults, according to the method, zero sequence voltage sampling data are subjected to fitting, whether zero sequence voltages are in fundamental frequency quantity can be judged according to the amplitude of a fitting function, wave distortion characteristics of the zero sequence voltages in the fundamental resonances are utilized to construct a wave distortion degree function, and degrees of wave distortion are calculated to distinguish the fundamental resonances and the one-phase grounding. The method has the advantages of being simple in principle, small in calculation amount, and high in sensitivity, the fundamental resonances and the one-phase grounding are accurately distinguished, and moreover ferromagnetic resonance faults are eliminated.
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Description

technical field

[0001] The invention relates to the electromagnetic field, in particular to a method for eliminating ferromagnetic resonance. Background technique

[0002] PT (potential transformer) ferroresonant overvoltage is the most common internal overvoltage in ungrounded neutral systems and causes the most accidents. In order to limit the PT ferroresonant overvoltage, those skilled in the art have proposed various solutions.

[0003] (1) PT open delta connection damping resistor. Its shortcomings are: when selecting the resistance, if the resistance is too large, it will not achieve the effect of eliminating the association, if the resistance is too small, when the system occurs single-phase grounding and runs continuously for 1~2 hours, it is required that the PT has a large enough Therefore, the incandescent lamp is generally selected as the damping resistor, and the resistance of the cold state is low, and the resistance of the cold state is high. However, ferro...

Claims

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