A New Technique Limiting Arc Earth Overvoltage and Improving Selecting wire Frequency of Low Current Earth
Lei Bin · Electric Switchgear · 2006
The arc earth overvoltage of non-direct earth system of 6~35kV neutral point damage to electric equipment is mainly studied and analyzed.Strong and weak points of measures of the limiting arc earth overvoltage is analyzed and compared.Take a bold adoption in the new technique of the limiting arc earth overvoltage.The former neutral point going through the arc-extinguishing coil earth system is made into the non-direct earth system of the neutral point.On the one hand,the arc earth overvoltage can be effectively controlled;on the othe hand,sensitivity of the low current earth selecting device and selecting wire accuracy are improved.The renew reform is a new breakthrough in the limiting arc earth overvoltage.