Research On The Choices Of Neutral Grounding In Medium-voltage Power Grid And The Evaluation Of Its Effect

This paper studies the influence of grounding method on power system operationcomprehensively. At present there are three kinds of neutral grounding methods used indomestic: neutral point grounding, resonant grounding, grounding resistance. Weanalyzed their basic operating characteristics, so that we can management area powernetwork neutral point grounding way scientifically and make the region grid canreal-time tuning. The system can be real-time tuning to accurately based on the real-timedata of capacitance current of power grid.. We can choose a kind of effective method ofreal time control of the power grid to capacitive current according to the variability ofcapacitive current of power grid.. We can adjust the arc suppression coil in real time thetap and real-time tuning of66KV system arc suppression coil according to the real-timecapacitance current compensation degree and system setting principles. If the66KVsystem arc suppression coil can real-time tuning, we can more accurately andcomprehensively analysis the power grid compensation degrees, at the same time we alsocan make the system more accurate and faster to choose looping tap position.On the premise that the power grid operations safely and stable, if the migration ofneutral point voltage controlled in a reasonable scope, the insulation level of equipmentcan not be jeopardized when voltage is too high. If only a small amount of residualcurrent through fault point when there is grounding grid, arc can be done quickly andrestore the normal operation of system timely so that to control the loss in minimumrange. In addition, the system will not resonance when power grid accident trip or judgewith separation system for brake operation, such as grounding lines. In the end we testedthe capacitive current parameters of the equipment in the power grid line and compared.the capacitive current test results and grid computing process the obtained data. Wetested the real-time tuning parameters of grid system to determine whether it meet thesite rules. There is not only theoretical value but also great realistic application value andpotential economic value to provide real-time, reliability, security guarantee for the gridsystem.