Research on Characteristics of Voltage Distribution of the Metal Oxide Arrester without Gap Used for AC System
Liu Ji-ying · Insulators and Surge Arresters · 2012
Because the voltage distribution of metal-oxide resistor could be uneven due to stray capacitance,that will make the electrical load rate of some resistors become higher,these resistors would be aging more quickly and damage first,finally cause the damage of the entire MOA and the expected operating life of the metal-oxide surge arresters would be reduced.Taking the 220 kV porcelain bushing arrester for example,by the method of calculation and actual measurment,the influence degree of various factors on the voltage uneven distribution parameter have been systematically analyzed,meanwhile the security risks in the existing 60 mm and even less than 60 mm resistors which used in 220 kV surge arrestors has been specially pointed out,which would contribute to the optimization design and safety operation of MOA.