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Practical Research on Fault Location in Distribution Networks
Author: ZhouXiaoMei
Tutor: YangYiHan
School: North China Electric Power University (Beijing)
Course: Proceedings of the
Keywords: Neutral point ungrounded system Ferroresonance Harmonic elimination measures
CLC: TM732
Type: Master's thesis
Year: 2008
Downloads: 239
Quote: 1
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Abstract
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The isolated neutral distribution network , often occur ferromagnetic resonance and ultra - low-frequency oscillation phenomenon caused by electromagnetic voltage transformer saturation , seriously affect the safe operation of the system . This paper analyzes the mechanism of the ferromagnetic resonance , resonant conditions occur , the use of a physical simulation experimental law of resonance occurs ; established a mathematical model of the ferromagnetic resonance circuit , with the analytic and numerical simulation of single-phase and three-phase the ferromagnetic resonant circuit was analyzed. In this paper, a detailed analysis of retrofitting nonlinear resistor or anti- resonant PT) for the two most commonly used harmonic elimination measures ( PT neutral point , improved anti - resonance PT , and put forward a new harmonic elimination measures - harmonic elimination reactor harmonic elimination . The piecewise linear vector graphic method , compensation principle of mathematical calculations and analysis method of harmonic elimination measures , theoretically prove the feasibility of the various options . Finally, the the ATP simulation program simulation of the above measures several harmonic elimination comprehensive comparative analysis of various harmonic elimination measures , and effective measures to solve its shortcomings .
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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system scheduling, management, communication > The operation of the power system
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