Dependence of over-voltage level of different voltage class surge arrestors on grounding device parameters. Experimental study and simulation

摘要

It is demonstrated experimentally at surge protecting device connection to grounding system overvoltage limitation level depends on inductive part of the grounding impedance. Experimental study of resistive-inductive equivalent circuit parameters effect has shown presence of high frequency voltage component with characteristic period 1-3 μs. Depending on the grounding inductance the overvoltage limitation level rises up to 20-40%/. It can substantially reduce the protected equipment life time.