Views: 0 Author: Site Editor Publish Time: 2018-03-24 Origin: Site
The voltages and current intensities of varistors do not conform to the Euclidean law, but show nonlinear correlation. When the voltage applied on both sides is second only to the nominal voltage, the resistance value of the varistor is close to infinity and the inside is close to no current. When the voltage applied on both sides is a little higher than the nominal voltage, the varistor will break down quickly and change from high resistance to low resistance, and the working current will increase rapidly. When the voltage applied on both sides is lower than the nominal voltage, the varistor returns to high resistance. When the voltage applied on both sides is higher than the limit voltage, the varistor will be destroyed and will not be able to recover by itself.
Therefore, the relationship between voltage and lightning protection effect of varistor is not the better the effect of lightning protection will be, the larger the voltage of varistor is, the better the function of self-overlapping utilization will be.