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The Research on the Neutral Point Grounded Mode of YongMei Group 6kV Distribution Power Networks

Author: YangZhanZuo
Tutor: SunYanZhou
School: Henan Polytechnic University
Course: Control Theory and Control Engineering
Keywords: Distribution network Capacitive current Arc suppression coil Fault Line Ground test
CLC: TM862
Type: Master's thesis
Year: 2009
Downloads: 29
Quote: 0
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Abstract


Yongmei 6kV high voltage distribution network neutral point ungrounded run a long time , with the coal mines to with grid scale continues to expand , with the grid is a significant increase in the current value of the capacitance to ground , a direct result of the single - phase ground fault frequency hair, and easy to develop into a ground fault phase short circuit or multi- point repeat the arc grounding overvoltage . It is necessary to study the distribution network structure of the status quo , redefine the neutral grounding to ensure the safety and reliability of the electricity supply . The papers from the measurement Yongmei begin distribution network capacitor current distribution network capacitor current distribution characteristics determine the distribution network Yongmei need to adopt a neutral point by arc suppression coil grounding . Neutral point by arc suppression coil grounding in high voltage distribution network is a typical grounding method , this grounding method has many advantages help to improve the reliability of power supply to prevent excessive voltage to improve security . Thesis by analyzing and comparing biasing automatic tuning the dynamic arc suppression coil sets device . Taking into account the very small ground current single - phase ground fault occurs , susceptible to interference detection , single-phase ground fault line selection in the distribution network security research focus . The paper analyzes and compares the advantages and disadvantages of the various line selection criterion in the small current grounding fault line selection technology , and eventually decided to use a small current grounding line selection device based on a comprehensive line selection criterion . Through the final papers with the the artificial ground test of the power grid scene , the arc suppression system arc suppression effect , a small current grounding line selection device able to accurately line selection .

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