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The Research on Ferroresonance Elimination Device of Grounded Low Current in Power Systems

Author: WangShiKai
Tutor: ZhangYanMing
School: Inner Mongolia University of Technology
Course: Detection technology and automation devices
Keywords: Neutral point Arc suppression coil Voltage transformer Ferroresonance
CLC: TM862
Type: Master's thesis
Year: 2007
Downloads: 221
Quote: 0
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Abstract


Electricity is one of the strategic focus of China's economic and social development , modernization of the electric power industry is imperative . The event of failure of the electric power system , its loss is often greater than their own losses , sometimes catastrophic . Our distribution network and large industrial and mining enterprises ground into neutral point directly to ground and the neutral point ungrounded . Neutral grounding system , each point in the grid potential is fixed , usually do not appear neutral point displacement voltage . Once the single-phase tripping affect the reliability of power supply , is rarely used ; isolated neutral system , usually connected with the star connection of electromagnetic voltage transformer substation bus , when some kind of disturbance occurs when , for example, the more common single- phase ground fault occurs , it may inspire ferroresonance overvoltage . Can produce different parameters with the fundamental frequency resonant high frequency resonant frequency division resonance . First single-phase resonant articles example describes the generation and characteristics of the ferromagnetic resonance , the circuit started as a three-phase ferromagnetic resonance Wizard . And detailed description of the three-phase ferroresonance circuit , its harmonic resonance , the fundamental resonance frequency division harmonic resonance modeling , to do further analysis . The article is based on a model of the three-phase ferroresonance a group prepared the data for the reference to the single-phase ground fault , for example , take advantage of the the Simulink simulation power system ferroresonance of the whole process : the steady-state operation - gt; single-phase the instantaneous ground - gt; grounded eliminate - gt; excitation resonant . The simulation can be clearer performance ferromagnetic resonance generation and elimination of the whole process . At last, on the basis of the foregoing theory proposed small current grounding system ferromagnetic resonance harmonic elimination device design , an IGBT control the action mechanism of the device is described to introduce the device hardware and software design . This device can eliminate the high frequency resonant , fundamental frequency resonant 1 / 2 frequency resonance , 1/ 3 of the ferromagnetic resonance frequency resonance , harmonic elimination rapidly .

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CLC: > Industrial Technology > Electrotechnical > High Voltage Engineering > Overvoltage and Its Protection > Over-voltage protection devices
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