Voltage-current characteristics of metal oxide varistors for low voltage telephone lightning protector under the application of multiple lightning impulse

摘要

Surges resulting from lightning strikes could propagate not only into the power line but also into the low voltage line such as the telecommunication system and could cause damage to the equipment. In order to protect this highly sensitiveequipment, a telephone lightning protector (MOV) has to be installed to the telephone set. Since the natural characteristics of lightning are a multiple stroke/flash, the response of the protector under this condition has to be investigated. This paperpresents the experimental studies on the voltage and current characteristic of the MOV under the application of multiple lightning impulse voltage and current.