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.

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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  • Method of eliminating ferromagnetic resonances
  • Method of eliminating ferromagnetic resonances
  • Method of eliminating ferromagnetic resonances

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with drawings and embodiments.

[0042] hardware structure

[0043] The hardware system of the microcomputer harmonic elimination device mainly includes MCU main system, data volume input system, human-computer interaction system, communication interface, power supply system and harmonic elimination circuit. The hardware structure block diagram is as follows: figure 1 shown.

[0044] MCU main system

[0045] The MCU main system is the core part of the entire microcomputer harmonic elimination device. In addition to executing the sine fitting algorithm and FFT algorithm, it is also responsible for triggering the conduction of the thyristor, multi-channel A / D conversion control, real-time clock control, human-computer interaction system control and Communication with substation background equipment. Considering that the microcomputer harmonic elimination device of this program has simple functions, sm...

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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.

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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Application Information

Patent Timeline
10 Jul 2013
Publication
CN103199514A
IPC
H02H9/04; H02H3/34; H02J13/00; G01R31/02
Inventors
尹刚; 罗建