A Study on Lifetime of ZnO Varistor for Signalling Electronic Equipment in Railway Track Environment

In recent years, the introduction of electronic equipment to railway signalling facilities has been advanced. On the other hand, it is often difficult to grasp the deterioration tendency of electronic equipment. This causes a problem for us to decide an appropriate time of replacement of aged electric equipment. In this paper, the authors consider lifetime evaluation of ZnO varistor for signalling electronic equipment under the disturbance such as lightning hazard and the usual use environment in railway tracks.