engleski

Energy Stress of Surge Arresters Due to Temporary Overvoltages

The paper presents a method for selecting the rated voltage of a metal oxide surge arresters (MOSA) based on the calculation of energy stresses. The electrical behaviour of gapless MOSA under temporary overvoltages (TOV) is important when selecting the rated voltage of MOSA. The study of the appropriate MOSA model is conducted for the evaluation of energy stresses due to TOV. The resistive part of the leakage current was derived from the voltage-current (U-I) characteristic for AC voltage that was gained during the laboratory tests. The MOSA model was implemented in the study of energy stresses of station arresters that are installed at both terminals of a compact upgraded line. By implementing the proposed method MOSA with relatively low protection level can be selected without being overstressed by TOV and thus the overvoltage protection of compact line can be improved.

TOV; MOSA; energy stress; laboratory measurements; compact line; EMTP-RV; rated voltage selection

nije evidentirano